WO2021117894A1

WO2021117894A1 - Woven fabric to be used in medical device for chest disease, and medical device for chest disease

Info

Publication number: WO2021117894A1
Application number: PCT/JP2020/046394
Authority: WO
Inventors: 高橋　哲子; 遼福田; 登起男奥野; 理絵千葉
Original assignee: 旭化成株式会社
Priority date: 2019-12-13
Filing date: 2020-12-11
Publication date: 2021-06-17
Also published as: JPWO2021117894A1

Abstract

Provided is a woven fabric to be used in a medical device for chest disease, said woven fabric comprising ultrafine fibers and having high wear resistance. This woven fabric to be used in a medical device for chest disease, which comprises at least two kinds of polyester multifilaments having different single fiber finenesses, is characterized in that: among the at least two kinds of polyester multifilaments, polyester multifilaments having the largest single fiber fineness, comprising filaments with a single fiber fineness of larger than 0.5 dtex and not larger than 10 dtex and having a total fineness of 7-120 dtex inclusive are arranged as warps; among the at least two kinds of polyester multifilaments, polyester multifilaments having the smallest single fiber fineness, comprising filaments with a single fiber fineness of 0.5 dtex or smaller and having a total fineness of 7-120 dtex inclusive are arranged as wefts; the weaving shrinkage (crimping) rate measured in accordance with JIS L1096 8.7 B of the warps is 0.2-8.0% inclusive; the crimping rate of the wefts is 3.0-14.0% inclusive; and the crimping rate of the wefts is larger than the crimping rate of the warps.

Description

Textiles for chest disease medical devices and chest disease medical devices

The present invention relates to a woven fabric suitably used for a medical device for treating a chest disease.

With the aging of the population and the westernization of eating habits, the number of patients with cardiovascular diseases such as ischemic heart disease, valvular disease, aortic aneurysm, and aortic dissection is increasing worldwide. Due to recent advances in medical technology and medical equipment, the treatment of these diseases has shifted from surgical surgery to transcatheter surgery and has become less invasive, greatly reducing the physical burden on patients. For example, in the treatment of aortic aneurysm, stent graft insertion is used in which a stent graft in which a spring-like metal called a stent is attached to a tubular artificial blood vessel is compressed and inserted into a catheter and placed open at the affected area. In the treatment of illness, an artificial heart valve made of biological tissue, which is a substitute for the heart valve, a metal frame, and a polyester woven material called a skirt for preventing blood leakage is compressed and inserted into the catheter in the same manner as a stent graft, and the valve portion is inserted. Transcatheter aortic valve replacement is used. On the other hand, in order to further reduce the physical burden on the patient and reduce the risk of access damage, it is desired to reduce the diameter of the catheter of these interpolation devices. As a means of reducing the diameter of the catheter, the occupied volume of the component member in the catheter is reduced, that is, the thickness of the tubular fabric used for the artificial blood vessel or artificial heart valve of the stent graft is reduced, or the diameter of the stent or metal frame is reduced. Efforts are being made such as doing things and devising designs. For example, in Patent Document 1 below, an ultrafine fiber having a single yarn fineness of 0.5 dtex is used, and the thickness is reduced by controlling the woven structure to achieve excellent blood leakage prevention. Further, in the following Patent Document 2, the thickness and blood leakage resistance are achieved as in Patent Document 1 by using ultrafine fibers and performing calendar processing.

On the other hand, implantable medical devices are increasingly adapted to young people and are expected to be indwelled in the body for a long period of 10 years or more, so high durability is required. Abrasion resistance, which is one index, has a trade-off relationship, and in particular, implantable medical devices such as stent grafts and artificial heart valves placed in the thoracic aorta are placed in a strong blood flow and pulsatile environment. As a textile used for a medical device for chest disease, it is necessary to solve the conflicting problems (trade-off relationship) at the same time. However, Patent Documents 1 and 2 relating to the invention of a woven fabric using ultrafine fibers having a single yarn fineness of 0.5 dtex or less do not disclose a technical idea for achieving both thinness and abrasion resistance.
As described above, a woven fabric for a medical device for thoracic disease, which uses ultrafine polyester fibers and has improved wear resistance, has not been provided so far.

Japanese Patent No. 6438692 Japanese Unexamined Patent Publication No. 2011-245283

In view of the above prior art, an object to be solved by the present invention is to provide a woven fabric for a medical device for chest disease, which contains ultrafine fibers and has high abrasion resistance.

As a result of diligent studies and experiments to solve the above problems, the present inventors control the single yarn fineness / total fineness of the fibers used in the woven fabric, the crimp ratio of the warp yarn, and the crimp ratio of the weft yarn within a predetermined range. As a result, it was unexpectedly found that a woven fabric for a medical device for chest disease having high abrasion resistance can be provided even if ultrafine fibers are used, and the present invention has been completed.

That is, the present invention is as follows.
[1] A textile for a chest disease medical device composed of at least two types of polyester multifilaments having different single yarn fineness, and the single yarn fineness of the at least two types of polyester multifilaments has the highest single yarn fineness of 0.5 dtex. A polyester multifilament containing a filament of ultra 10 dtex or less and having a total fineness of 7 dtex or more and 120 dtex or less is arranged in the warp yarn, and among the at least two types of polyester multifilaments, the single yarn fineness is the smallest. A polyester multifilament containing a filament of 0.5 dtex or less and having a total fineness of 7 dtex or more and 120 dtex or less is arranged on the weft yarn, and the weaving shrinkage (crimp) rate of the warp yarn conforming to the JIS L1096 8.7 B method is 0.2% or more. A textile for a medical device for chest disease, characterized in that the crimp rate of the weft yarn is 8.0% or less, the crimp rate of the weft yarn is 3.0% or more and 14.0% or less, and the crimp ratio of the weft yarn is larger than the crimp ratio of the warp yarn.
[2] The woven fabric for a chest disease medical device according to the above [1], wherein the polyester multifilament having the highest single yarn fineness has a single yarn fineness of more than 0.5 dtex and 2.5 dtex or less.
[3] A composite yarn of a polyester multifilament having a single yarn fineness of more than 0.5 dtex and 10 dtex or less and a polyester multifilament having a single yarn fineness of 0.5 dtex or less, and the total fineness of the composite yarn is 20 dtex or more and 120 dtex or less. / Or a woven fabric for thoracic disease medical devices, which is arranged on weft threads.
[4] The woven fabric for a chest disease medical device according to the above [3], wherein the compounding ratio of the polyester multifilament having a single yarn fineness of more than 0.5 dtex and 10 dtex or less in the composite yarn is 15% by weight or more and 65% by weight or less.
[5] The above-mentioned [1] to [4], wherein the weft overlap rate (weft overlap rate) is 0.90 or more, and the warp overlap rate (warp overlap rate) is less than 0.90. Chest disease medical device textiles.
[6] The woven fabric for a chest disease medical device according to the above [5], wherein the CV value of the weft overlap rate is 0.1 or less and the CV value of the warp overlap rate is 0.1 or less.
[7] The burst strength of the woven fabric conforming to ANSI / AAMI / ISO 7198: 1998/2001 after the abrasion test of 5000 times using the Martindale abrasion tester conforming to JIS L 1096 8.19.5 E method. The woven fabric for a medical device for chest disease according to any one of the above [1] to [6], which is 140 N or more.
[8] The woven fabric for a medical device for chest disease according to the above [7], wherein the retention rate of the burst strength before and after the wear test is 65% or more.
[9] The chest disease medical device according to any one of [1] to [8] above, wherein the water permeability of the woven fabric conforming to ANSI / AAMI / ISO 7198: 1998/2001 is 400 cc / cm ^{2 / min or less.} Textile for.
[10] The medical device for treating chest disease according to any one of [1] to [9] above, wherein a metal member is sutured and fixed to the inner surface and / or outer surface of the woven fabric for chest disease medical device.
[11] The medical device for treating thoracic disease according to the above [10], wherein the medical device for treating thoracic disease is a device for treating thoracic aortic aneurysm.
[12] The medical device for treating thoracic disease according to the above [10], wherein the medical device for treating thoracic disease is a device for thoracic aortic valve replacement.

The present invention is a woven fabric that can be suitably used for chest disease medical devices used for the treatment of the heart and vascular system because the abrasion resistance can be improved while using ultrafine fibers.

It is explanatory drawing for calculation of the weft overlap rate. It is explanatory drawing for calculation of the warp overlap ratio.

Hereinafter, embodiments of the present invention will be described in detail.
One embodiment of the present invention is a woven fabric for a chest disease medical device composed of at least two kinds of polyester multifilaments having different single yarn fineness, and the single yarn fineness is the largest among the at least two kinds of polyester multifilaments. , Polyester multifilaments containing filaments with a single yarn fineness of more than 0.5 dtex and 10 dtex or less and having a total fineness of 7 dtex or more and 120 dtex or less are arranged in the warp yarns, and among the at least two types of polyester multifilaments, the single yarn fineness is A polyester multifilament containing the smallest filament with a single yarn fineness of 0.5 dtex or less and having a total fineness of 7 dtex or more and 120 dtex or less is arranged on the weft yarn, and the warp yarn is crimped according to the JIS L1096 8.7 B method. ) Chest disease medical treatment characterized in that the rate is 0.2% or more and 8.0% or less, the crimp rate of the weft is 3.0% or more and 14.0% or less, and the crimp rate of the weft is larger than the crimp rate of the warp. It is a textile for equipment.

Another embodiment of the present invention is a composite yarn of a polyester multifilament having a single yarn fineness of more than 0.5 dtex and 10 dtex or less and a polyester multifilament having a single yarn fineness of 0.5 dtex or less, and having a total fineness of 20 dtex or more and 120 dtex or less. A woven fabric for a medical device for chest disease, wherein the composite yarn is arranged in a warp and / or a weft.

The fiber characteristics such as the single yarn fineness, the total fineness, and the crimp ratio of the polyester multifilament in the present embodiment are the characteristics of the yarn (decomposed yarn) extracted from the woven fabric unless otherwise specified.

[Weft]
The woven fabric for thoracic disease medical devices of the present embodiment is a woven fabric in which specific ultrafine fibers are arranged on weft threads, and the ultrafine fibers contain filaments having a single yarn fineness of 0.5 dtex or less and a total fineness of 7 dtex or more. It is a polyester multifilament of 120 dtex or less. Here, the single yarn fineness is the fineness per single yarn, and the total fineness is the product of the fineness per single yarn and the number of single yarns. The single yarn fineness of the ultrafine fiber is 0.5 dtex or less, which contributes to the thinning of the woven fabric, suppresses the water permeability that is an index of blood leakage to a low level, and gives the woven fabric flexibility and wrinkle resistance in the circumferential direction. Can be granted. The single yarn fineness of the ultrafine fiber is preferably 0.4 dtex or less, more preferably 0.3 dtex or less. On the other hand, the lower limit of the single yarn fineness of the ultrafine fiber is preferably 0.01 dtex or more, more preferably 0.03 dtex or more, and further preferably 0.1 dtex or more from the viewpoint of abrasion resistance. The total fineness of the ultrafine fibers is 7 dtex or more and 120 dtex or less. When the total fineness is in the above range, the required abrasion resistance can be satisfied, and the thickness of the woven fabric, which is preferable for reducing the outer diameter of the catheter, can be satisfied of 150 μm or less. The total fineness of the ultrafine fibers is preferably 10 dtex or more and 100 dtex or less, and more preferably 30 dtex or more and 80 dtex or less, from the viewpoint of combining the abrasion resistance of the woven fabric, the thinning, and the practical physical properties as a woven fabric for implantable medical devices.

The weft of the fabric for chest disease medical equipment of the present embodiment is a polyester ultrafine fiber having a single yarn fineness of 0.5 dtex or less and a total fineness of 20 dtex or more and 90 dtex or less, and a polyester having a single yarn fineness of 0.5 dtex or more and 10 dtex or less and a total fineness of 20 dtex or more and 90 dtex or less. The fiber may be composed of one type or a combination of two or more types depending on the purpose, and within a range that does not impair the object of the present invention, the single yarn fineness is 0.5 dtex or less and the total fineness is 20 dtex or more and 90 dtex or less. One or a combination of two or more kinds of fiber materials different from polyester, such as polyester ultrafine fibers and fluororesin fibers having a single yarn fineness of more than 0.5 dtex, may be used depending on the purpose. As a mode of combination, the ultrafine fibers and other fibers may be twisted to form a composite fiber depending on the purpose, or may be arranged alternately or randomly.

Further, from the viewpoint of improving wear resistance, the ultrafine fibers of the woven fabric for chest disease medical equipment of the present embodiment are preferably twisted, and the number of twisted yarns is preferably 50 times / m or more, more preferably 100 times. / M or more, most preferably 200 times / m or more. On the other hand, from the viewpoint of preventing blood leakage, the upper limit of the number of twisted yarns is preferably 800 times / m or less, more preferably 600 times / m or less, and most preferably 500 times / m or less. When a composite yarn according to another embodiment of the present invention is used as the weft, ultrafine fibers, fibers having a high fineness may be twisted by the number of twisted yarns, or untwisted yarns may be twisted together. The total number of twisted yarns is preferably 50 times / m or more and 800 times / less.

The ultrafine fibers of the woven fabric for chest disease medical equipment of the present embodiment preferably have a tensile strength of 3.0 cN / dtex or more and a tensile elongation of 12% or more of the yarn (decomposed yarn) extracted from the woven fabric. .. When the tensile strength of the ultrafine polyester fiber (decomposed thread) is 3.0 cN / dtex or more, thread breakage due to friction with metal members such as the heart or blood vessels, sutures, and biological tissues is suppressed. Therefore, excellent wear resistance can be exhibited, and further, tearing of the sutured portion can be prevented. Similarly, when the tensile elongation of the ultrafine fiber (decomposed yarn) is 12% or more, the toughness is improved, the yarn breakage due to friction is suppressed, and excellent wear resistance is exhibited, and at the same time, the sutured portion with the metal member or the like is exhibited. Can be prevented from tearing.

[Warp]
In the woven fabric for thoracic disease medical equipment of the present embodiment, polyester multifilaments (regular fibers) having a single yarn fineness of more than 0.5 dtex and 10 dtex or less and a total fineness of 20 dtex or more and 120 dtex or less are arranged in the warp. When the lower limit of the single yarn fineness of regular fibers is more than 0.5 dtex and the total fineness is 20 dtex or more, the correlation with the ultrafine fibers of the specific fineness (single yarn fineness, total fineness) arranged in the weft is , It is possible to prevent the ultrafine fibers from protruding to the surface of the woven fabric and improve the wear resistance of the woven fabric. From the viewpoint of improving the abrasion resistance of the woven fabric and improving the mechanical properties such as the burst strength, the regular fiber preferably has a single yarn fineness of 1.0 dtex or more and a total fineness of 25 dtex or more. On the other hand, the upper limit of the single yarn fineness of the regular fiber needs to be 10 dtex or less in the correlation with the ultrafine fiber of the specific fineness arranged in the weft. When the single yarn fineness of the regular fiber exceeds 10 dtex, the crimp rate of the weft, which will be described later, exceeds 14.0%, the ultrafine fibers protrude to the surface of the woven fabric, and the abrasion resistance is lowered.
In order to suppress the protrusion of the weft ultrafine fibers to the woven fabric surface, the upper limit of the single yarn fineness of the regular fiber is preferably 8dtex or less, more preferably 6dtex or less, still more preferably 3dtex or less, and most preferably 2.5dtex. It is as follows. Similarly, when the upper limit of the total fineness of regular fibers is 120 dtex or less, it is possible to suppress the protrusion of ultrafine fibers, which are wefts, to the surface of the woven fabric, and the thickness of the woven fabric, which is preferable for the purpose of reducing the diameter of the device, is 150 μm. The following can be realized.

Further, the regular fiber of the woven fabric for chest disease medical equipment of the present embodiment is preferably twisted from the viewpoint of improving wear resistance, and the number of twisted yarns is preferably 100 times / m or more, more preferably 200 times. / M or more, most preferably 300 times / m or more. On the other hand, from the viewpoint of preventing blood leakage, the upper limit of the number of twisted yarns is preferably 1000 times / m or less, more preferably 700 times / m or less, and most preferably 800 times / m or less.

[Crimp rate]
The textile for chest disease medical equipment of the present embodiment has a warp yarn crimp rate (based on JIS L1096 8.7 B method) of 0.2% or more and 8.0% or less, and a weft yarn crimp rate of 3.0% or more and 14.0% or less. And it is necessary that the crimp rate of the weft is larger than the crimp rate of the warp. By controlling the crimp ratio of the warp to 0.2% or more and 8.0% or less, the protrusion of the ultrafine fibers to the woven fabric surface is suppressed in the correlation with the ultrafine fibers specified in the present invention, and excellent wear resistance is obtained. Can be demonstrated. Furthermore, when the crimp rate of the warp threads is 0.2% or more, the thread displacement (sliding) of the weft threads can be suppressed, and the opening of the stitched portion is suppressed under the pulsation after being placed in the body. The opening causes blood leakage and affects the increase in the crimp rate of the weft thread partially pushed in one direction, which negatively affects the wear resistance. From the viewpoint of suppressing the protrusion of the ultrafine fibers on the woven fabric surface and preventing the weft from slipping, the crimp ratio of the warp is preferably 0.3% or more and 7.5% or less, more preferably 1.0% or more and 7.0% or less, and further preferably 1.0% or more and 5.0. % Or less, 1.0% or more and 3.0% or less.

The crimp rate of the weft thread extracted from the woven fabric for chest disease medical equipment of the present embodiment must be 3.0% or more and 14.0% or less, and the weft thread must be crimped larger than the warp thread. When the crimp rate of the weft is 3.0% or more and is larger than the crimp rate of the warp, the filaments of the ultrafine fibers are prevented from being spread by the warp and the ultrafine fibers are prevented from protruding to the surface of the woven fabric, resulting in excellent abrasion resistance. In addition to being able to exhibit its properties, it works suitably for thinning the woven fabric and reducing the water permeability (preventing blood leakage). Further, when the crimp ratio of the weft is 14.0% or less, the ultrafine fibers do not protrude on the surface of the woven fabric, and excellent abrasion resistance can be exhibited. The crimp ratio of the weft is preferably 3.5% or more and 13.5% or less, more preferably 4.0% or more and 13.0% or less, and further preferably 7.0% from the viewpoint of abrasion resistance and woven fabric properties (thin film and water permeability). More than 13.0% or less.

Since the woven fabric of the present embodiment is controlled so that the weft and the warp are appropriately crimped, the opening in the warp direction and the weft direction of the sutured portion with the metal member is suppressed, and blood leakage occurs when the affected part is placed. It is also suitable from the viewpoint of difficulty.

[Thread overlap rate]
In the woven fabric for thoracic disease medical equipment of the present embodiment, the overlapping rate between adjacent weft threads is preferably 0.90 or more. When the overlap rate of the weft yarn containing the ultrafine fiber having a single yarn fineness of 0.5 dtex or less is 0.90 or more, the water permeability can be suppressed low and excellent blood leakage prevention property can be obtained. Here, as shown in FIG. 1, the weft overlap ratio is an overlapping portion of adjacent wefts passing through the front surface and the back surface of the warp by X-ray CT of a woven fabric arbitrarily cut in the warp direction of 10 mm or more and the weft direction of 20 mm or more. It is the average value of the weft overlap rate of 20 or more weft overlapping portions calculated by the following formula (1) by photographing 2 or more points at arbitrary points at a magnification of 50 or less. The weft overlap rate is more preferably 0.95 or more from the viewpoint of obtaining a thinner woven fabric, better blood leakage resistance, and opening resistance when knotted with sutures.

In FIG. 1, the weft overlap ratio a'is similarly calculated by = (b'+ b ") / c'.

Further, the CV value of the weft overlap ratio is preferably 0.1 or less. Here, the CV value of the weft overlap rate is calculated by the following equation (2). If the CV value of the weft overlap rate is more than 0.1, that is, the variation of the weft overlap rate is large, even if the average value of the weft overlap rate is 0.90 or more, there are many parts where the weft overlap rate is less than 0.90. Since the weft is not crushed by the warp and becomes an elliptical shape in the portion and comes into direct contact with the worn part, it is preferentially rubbed and a hole is opened. When the CV value of the weft overlap ratio is 0.1 or less, the weft is crushed uniformly and evenly on the surface of the woven fabric, and excellent abrasion resistance is exhibited. The CV value of the weft overlap rate is more preferably 0.09 or less, and most preferably 0.08 or less.

In the woven fabric for chest disease medical equipment of the present embodiment, it is preferable that the overlapping rate of adjacent warp threads is less than 0.90. As mentioned above, the fabric used for medical equipment for treating chest diseases needs to have high blood-proof leakage property, and in order to achieve that purpose, both warp and weft are woven at high density, that is, adjacent warp threads are woven together. -It is a general idea to bring the wefts closer to each other and set a high overlap rate, and Patent Document 1 also states that the warp overlap rate is preferably 0.90 or more. However, from the viewpoint of improving wear resistance, this idea is in the opposite direction. That is, when the warp overlap rate is 0.90 or more, it becomes difficult for the weft to enter between the warp, so that the crimp rate of the weft tends to exceed 14%. That is, the warp overlap rate is preferably less than 0.90 from the viewpoint that the crimp rate of the weft can be easily controlled to 14% or less. On the other hand, from the viewpoint of maintaining low water permeability, the lower limit of the warp overlap rate is preferably 0.60 or more, more preferably 0.70 or more.

Further, the CV value of the warp overlap rate is preferably 0.10 or less. When the CV value of the warp overlap rate exceeds 0.10, that is, when the variation in the warp overlap rate is large, there is a part where the warp overlap rate exceeds 0.90 and a part where the warp overlap rate is less than 0.60. Abrasion resistance may be deteriorated, and the latter may lead to partial deterioration of water permeability. There is concern that the former deterioration of wear resistance will cause holes to expand from there, even if only partially. The CV value of the more preferable warp overlap ratio is 0.09 or less, and most preferably 0.08 or less.

Further, the woven fabric of another embodiment of the present invention is a composite yarn of a polyester multifilament having a single yarn fineness of more than 0.5 dtex and 10 dtex or less and a polyester multifilament having a single yarn fineness of 0.5 dtex or less, and has a total fineness of 20 dtex or more and 120 dtex. The following composite yarn is a woven fabric in which the warp yarn and / or the weft yarn are arranged. Abrasion resistance is improved by blending the extra-fine polyester fiber with the thick polyester fiber, but another feature of the embodiment is that, for example, the extra-thick fiber having a single yarn fineness of more than 5 dtex is oriented. Regardless, the thickness of the woven fabric is much thinner than that of a woven fabric in which general regular fibers with a single yarn fineness of about 1 to 2 dtex are arranged in the warp and weft. Further, a feature of another embodiment using the composite yarn is that it exhibits high blood-proof leakage property (excellent low water permeability) even when thick fibers are blended. In order to express these characteristics more efficiently and stably, it is recommended to control the warp yarn overlap ratio, the weft yarn overlap ratio, and the respective CV values within the above-mentioned preferable ranges. For example, when a composite yarn is used for the weft, when the warp overlap ratio is 0.90 or more, the weft containing the fibers having a high fineness is not crushed flatly, the thickness increases remarkably, and naturally the water permeability also deteriorates remarkably. It may exceed a certain 400cc / cm ^{2 / min.} Further, the composite yarn can be obtained by twisting ultrafine fibers and thick fibers (twisted yarn), entwining them by interlacing or the like, or by a method such as false twisting or covering. For example, in the case of twisted yarn, the number of twisted yarns is preferably 50 or more and 800 times / m or less in order to maintain water permeability.

The blending ratio of the polyester multifilament having a single yarn fineness of more than 0.5 dtex and 10 dtex or less in the composite yarn is preferably 15 to 65% by weight. By blending 15 to 65% by weight of fibers with high fineness, wear resistance is significantly improved compared to woven fabrics that use only ultrafine fibers for weft, and water permeability is 400 cc / cm ² / min or less. Can be suppressed.

The polyester fiber constituting the woven fabric of the present embodiment is not particularly limited, and examples thereof include aromatic polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polycyclohexane terephthalate, and polyethylene terephthalate is most preferable. Further, fluororesin fibers such as PTFE and ETFE, polyamide fibers, polyolefin fibers and the like may be partially used as long as the desired effect is obtained. It is also a preferred embodiment that the woven fabric of the present embodiment partially uses conductive fibers containing metal fibers, carbon and the like in order to provide an external monitoring function for the purpose of prognosis observation.

The woven fabric structure of the woven fabric for chest disease medical equipment of the present embodiment includes plain weave, twill weave, satin weave, satin weave and the like, and the crimp ratio of the weft and warp yarns constituting the woven fabric is not particularly limited. A plain weave structure or a twill weave structure is preferable from the viewpoint of controlling the range. Further, from the viewpoint of tear strength and improvement of tensile strength, it is possible to have a ripstop structure.

In the woven fabric for a chest disease medical device of the present embodiment, the sum of the warp cover factor (CFw) and the weft cover factor (CFf) is preferably CFw + CFf = 1500 or more, and more preferably CFw + CFf = 1700. That is all. By setting the sum of CFw and CFf to 1500 or more, the gap between adjacent wefts and / or warp-warp is reduced, and the warp / weft misalignment during continuous wear (for example, pulsation). Is less likely to occur, and friction between the warp and weft can be prevented.

The woven fabric for chest disease medical equipment of the present embodiment may be a woven fabric in which sheet-shaped woven fabrics are sewn into a tubular shape, but the thickness of the sewn portion increases, which hinders the folding of the woven fabric into thin pieces. There is a risk of coming. Therefore, the woven fabric for a chest disease medical device of the present embodiment is preferably in the form of a tubular seamless woven fabric (woven fabric) from the viewpoint of realizing a smaller diameter of the implantable medical device and preventing blood leakage. Further, the tubular woven fabric for the implantable medical device of the present embodiment may have a straight shape with no diameter change, a tapered shape with a diameter change, a shape including a tapered portion as a part, and a branched shape. However, the shape may be a plurality of branches, and is not particularly limited.

The thickness of the woven fabric for chest disease medical equipment of the present embodiment is particularly limited as long as it is appropriately designed according to the total fineness and single yarn fineness of the fibers used, the weaving density, and the weaving structure according to the site to be used. However, from the viewpoint of reducing the diameter of the implantable medical device, when it is used as an artificial blood vessel which is a main member of a stent graft, it is preferably 10 μm or more and 150 μm or less, and more preferably 15 μm or more and 130 μm or less. Here, the thickness of the woven fabric is defined by the average value of the values measured by using the thickness gauge at 10 woven fabrics arbitrarily selected in the circumferential direction and the length direction of the woven fabric.

The woven fabric for chest disease medical equipment of this embodiment is based on ANSI / AAMI / ISO 7198: 1998/2001 after a wear test of 5000 times using a Martindale wear tester conforming to JIS L 1096 8.19.5 E method. The burst strength measured according to the burst strength test is preferably 140 N or more, more preferably 150 N or more. Further, the retention rate (%) of the burst strength in the wear test, that is, {(burst strength after the wear test) / (burst strength before the wear test)} × 100 is preferably 65% or more, more preferably. It is preferably 75% or more.

In the woven fabric for chest disease medical devices of the present embodiment, the water permeability of the woven fabric conforming to ANSI / AAMI / ISO 7198: 1998/2001 ^{is preferably 400 cc / cm 2} / min or less. The water permeability of the woven fabric is an index for preventing blood leakage, and when the water permeability is 400 cc / cm ² / min or less, blood leakage from the wall surface of the woven fabric can be suppressed. From the viewpoint of practical performance, the water permeability of the woven fabric for chest disease medical devices of the present embodiment is more preferably 300 cc / cm ² / min or less, further 250 cc / cm ² / min or less, and most preferably 200 cc / cm ² / min. Is.

The woven fabric for a chest disease medical device of the present embodiment may have its end cut or a hole may be formed on the side surface according to the shape of a metal member or other members to be combined. It is preferable that the cut portion and the periphery of the hole are treated by sewing or heat melting so that the fiber is not loosened or the woven fabric is not torn. When making holes, it is sufficient to appropriately design the number and diameter of the holes according to the number and diameter of blood vessels around the site where the stent fabric is attached. The shape of the hole is not limited, but may be circular, oval, triangular, square, polygonal, or random. Further, the woven fabric for a medical device for chest disease of the present embodiment may be attached with a transmission marker.

The woven fabric for a chest disease medical device of the present embodiment may be coated with an antithrombotic material, collagen, gelatin, heparin, acetylsalicylic acid, polyurethane or the like within a range that does not deviate from requirements such as a desired thickness and outer diameter.
The woven fabric for a medical device for chest disease of the present embodiment can also be pressed or crimped with a calendar or the like as long as the object of the present invention is not impaired.

Another embodiment of the present invention is a device for a medical device used for treating a heart or vascular disease in which the above-mentioned fabric is used as a component of the medical device. The target device is not particularly limited, and examples thereof include a stent graft used for treating thoracic aorta and aortic dissection, and a transcatheter aortic valve replacement device used for treating aortic stenosis. It should be noted that it is not denied that it is used as a member for treating aneurysms formed in the abdominal aorta and the iliac artery. The medical device in which the constituent members such as a woven fabric and a metal member such as a stent or a metal frame are bound and fixed with sutures is exposed to strong blood flow and constant pulsation in an indwelling part such as a heart or an artery. Friction with metal occurs at the sutured part, friction with living tissue at the indwelling part, and friction with blood fluid. However, the woven fabric of the present invention is constantly worn by friction with solid and liquid due to the above-mentioned design. It is suppressed.

Hereinafter, a method for producing a woven fabric for a medical device for chest disease according to the present embodiment will be described, but the present invention is not intended to be limited to these methods.
Further, as an example, polyethylene terephthalate (PET) is mentioned as a fiber raw material used for producing the woven fabric of the present embodiment, but the material is not limited to this material. For the production of ultrafine fibers and fibers with high fineness (regular fibers), a so-called direct melt spinning method is adopted in which ultrafine fibers and regular fibers having a predetermined single yarn fineness and total fineness are produced by melt spinning and subsequent drawing. Is preferable. As described above, it is preferable to twist the ultrafine fibers and regular fibers at a predetermined number of times from the viewpoint of controlling wear resistance and low water permeability, but they have excellent process passability (thread breakage during weaving). From the viewpoint of suppressing fluffing and fluffing), it is preferable to apply plying to impart convergence. As a method of twisting, a known or conventional twisting method can be used, and examples thereof include known twisting machines such as a ring twisting machine, a double twister, an Italian twisting machine, a covering machine, and a false twisting machine. The form of the twisted yarn may be a single-twisted yarn in which one or two or more filaments are aligned and twisted in the S or Z direction, or two or more such single-twisted yarns are aligned and further twisted upward. It may be a twisted yarn overlaid with. The number of twists of the ultrafine fibers used for the weft is preferably 50 times / m or more and 800 times / m or less. By setting the number of twists to 50 times / m or more, smoothness is improved, stresses such as tension and bending are uniformly applied to the filament, problems of fluff and yarn breakage during weaving are reduced, and process stability. It leads to the improvement of. By applying plying of 800 times / m or less, the warp and weft on the woven fabric tend to be flattened, the gap between the adjacent weft and / or warp and warp is reduced, and the abrasion resistance and water permeability are lowered. can do. The number of twists of the regular fibers used for the warp yarns is preferably 100 times / m or more, more preferably 200 times / m or more, from the viewpoint of suppressing rubbing between the warp yarns in the weaving process.

On the other hand, as another method of producing a composite yarn of ultrafine fibers and high fineness, which is another embodiment of the present invention, there are twisted yarns, false twists, entanglement by interlacing, covering and the like, but the method is not particularly limited thereto. For example, in the case of twisting ultrafine fibers and regular fibers with each other, so-called twisting, the above-mentioned methods and machines can be mentioned. When confounding is applied by interlacing, it is sufficient to control so that entanglement of 100 fibers / m or less is applied depending on the thickness of the fibers used, especially within the range where the ultrafine fibers do not fluff, but the air pressure is preferable. It is 0.01MPa to 0.10Mpa. Further, by giving a tension difference to the threads to be entangled, the arrangement of the thread sheath core structure can be arbitrarily controlled. For example, the looser tension can be arranged on the sheath side, and the higher tension yarn can be arranged on the core side. The number of threads to be mixed and the arrangement of the sheath core structure may be arbitrarily set according to the purpose.

Next, when a composite yarn is manufactured by false twisting, a plurality of yarns having different fineness may be pulled out at the same time, and the plurality of yarns may be falsely twisted and mixed at the same time. After the twisting process, a method of more uniform mixing using air pressure in the interlacing process up to the winding portion may be adopted. The place where the interlacing is performed is not limited to after the false twisted portion, but may be before, and may be performed according to an arbitrary purpose.

When mixing yarns by covering, it has a sheath core structure, and multiple yarns can be arranged on the sheath side by preparing a double covering machine or yarns mixed in advance by twisting or interlacing. The arrangement of the threads may be arbitrarily selected according to the purpose.

A tubular seamless woven fabric can be manufactured using the fibers obtained by the above manufacturing method. The loom for producing the tubular seamless woven fabric is not particularly limited, but it is possible to use a shuttle loom through which the weft is passed by the reciprocating motion of the shuttle to weave the ears of the woven fabric (folded part of the woven fabric). It is preferable from the viewpoint of suppressing the decrease in density and making the thickness of the woven fabric uniform.
When weaving a woven fabric for a medical device for chest disease of the present embodiment, it is necessary to control the raising and lowering of the warp threads, and as a device for that purpose, a jacquard type opening device, a dobby type opening device, or the like can be used.

There are no particular restrictions on the means of controlling the crimp rate of the warp threads to 0.2% or more and 8.0% or less, and the crimp rate of the weft threads to 3.0% or more and 14.0% or less. The weaving density (CF) of the weft and the warp and the number of twists of the weft are appropriately designed so as to be less than, the warp tension at the time of weaving and the pull-out tension of the weft from the shuttle are adjusted, and the warp and / or the weft is heat-shrinked. Any of the rate and heat setting after weaving, post-treatment condition adjustment such as refining, or a method of appropriately combining these conditions can be mentioned. For example, when adjusting the warp tension during weaving, the adjustment range of the warp tension is preferably 0.5 to 1.5 g / dtex, more preferably 0.6 to 1.3 g / dtex, and further preferably 0.7 to 1.2 g / dtex. is there. By controlling the warp tension within the above range, the driving performance is improved when the weft is driven, and the weft can be controlled to the desired crimp rate.

The pull-out tension of the weft is preferably 0.1 g / dtex or more and 0.5 g / dtex or less from the viewpoint of suppressing an increase in the crimp rate of the weft due to weaving shrinkage in the circumferential direction after weaving. When the weft tension is less than 0.1 g / dtex, the weft is less likely to be crushed by the warp and the crimp rate tends to be high, and the yarn loosens when the weft is driven, which makes weaving with continuous and stable quality difficult. Further, even if the weft pull-out tension exceeds 0.5 g / dtex, the crimp rate of the weft tends to increase as well. This is due to weaving shrinkage after weaving. The tension at the time of driving the weft is more preferably 0.2 g / dtex or more and 0.4 g / dtex or less from the viewpoint of the uniformity of the crimp ratio of the warp and the weft of the entire fabric. Depending on the weft brand and the warp brand used for weaving, the warp tension and the weft tension can be controlled within the above range to control the crimp rate of the warp and the weft.

In addition, after weaving, post-treatment such as heat setting for morphological stability and refining treatment for removal of oils and the like is performed, but the heat setting conditions are constant tension, 10 to 30 at 150 to 200 ° C. The crimp rate of the warp and the weft can be controlled by appropriately changing the weft brand, the warp brand, and the weaving condition within the range of 10 to 150 minutes at the refining condition of 60 to 90 ° C. for 1 minute.

That is, the weft crimp ratio is determined by adjusting the single yarn fineness / total fineness, the warp overlap ratio, the thick fineness blending ratio of the composite yarn, and the weft pull-out tension and the warp tension as the manufacturing conditions, so that the weft overlap ratio is CF ( In particular, weft density), number of weft twists, warp overlap ratio, and weft pull-out tension and warp tension are adjusted as manufacturing conditions, and the weft overlap ratio CV value is determined by the number of weft twists, the composition ratio of the thickness of the composite yarn, and the composite yarn. By adjusting the yarn manufacturing method (plying conditions) and the warp overlap ratio, the warp crimp ratio can be adjusted by adjusting the manufacturing conditions (warp tension, weft pull-out tension), and the warp overlap ratio can be adjusted to CF (especially warp). The warp overlap ratio CV value can be controlled by adjusting the warp tension balance (number of reed threads), manufacturing conditions (weft pull-out tension), and the number of warp twists. Can be done. By optimizing each of these regulators, the woven fabric for chest disease medical devices of the present embodiment can exert an action effect that wear resistance can be improved while using ultrafine fibers. ..

The woven fabric woven by the above method is combined with various members for the target medical device using sutures, and inserted into a catheter to treat a chest such as a heart or vascular disease, that is, a medical device for treating chest disease. (Treatment device for thoracic aortic suture, device for thoracic aortic valve replacement, thoracic stent graft, etc.). In addition, these therapeutic devices can be used for the treatment of the chest such as heart and vascular diseases.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. The main measured values of physical properties were measured by the following methods.
(1) Total fineness / single yarn fineness (evaluation of raw yarn)
The total fineness (dtex) is a value obtained by winding a fiber bundle 50 times with a skein of 1 m per circumference, measuring the weight of the thread, and multiplying it by 200. The single yarn fineness (dtex) is a value obtained by dividing the total fineness obtained by the above method by the number of single yarns.
(Evaluation from woven fabric, total fineness of decomposed yarn / single yarn fineness)
Collect three 200 mm x 200 mm test pieces. Each of the warp and weft threads is unwound and spread thinly on a scanning electron microscope (SEM) sample table, and SEM observation is performed at a magnification equivalent to 500 to 1000 times. With respect to the obtained SEM image, a line is drawn in the direction of the fiber bundle and the direction perpendicular to the fiber bundle, 10 single yarns intersecting the line are randomly selected, and the diameter (fiber diameter) is measured from the enlarged image. The fineness is converted from the average value of the fiber diameters of 10 single yarns to obtain the single yarn fineness of the decomposed yarn. Further, the product of the single yarn fineness of the decomposed yarn and the number of single yarns of the raw yarn is defined as the total fineness of the decomposed yarn. When two or more different fibers are twisted together, the fiber diameters of 10 single yarns are measured for each fiber type in the same manner as described above, and the single yarn fineness and the total fineness are calculated.

(2) Tensile strength (cN / dtex) / tensile elongation (%)
The tensile strength and tensile elongation of the raw yarn and the decomposed yarn are measured according to JIS-L-1013.

(3) Weaving density of warp and weft (book / 2.54 cm)
Measure based on JIS L-1096 (2010) 8.6.1. Place the sample on a flat table, remove unnatural wrinkles and tension, count the number of warp and weft in the 2.54 cm section at 5 different locations, and calculate the average value for each.

(4) Warp or weft cover factor (CFw, CFf)
The cover factor is calculated by the following formula using the weaving density of (3) above.
Warp cover factor (CFw) = (total warp fineness: dtex) ^1/2 x (warp weaving density: book / 2.54 cm)
Weft cover factor (CFf) = (total weft fineness: dtex) ^1/2 x (weft weaving density: book / 2.54 cm)
CF = CFw ＋ CFf
As the total fineness of the warp or weft, the total fineness of the decomposed yarn from the woven fabric of (1) above is used.

(5) Weaving shrinkage rate (crimp rate)
Measure according to the method described in JIS L-1096 (2010) 8.7 B method.
Mark a distance of 200 mm at three points in each of the warp and weft directions, untie the warp and weft in this mark, measure the length (mm) stretched straight under the initial load, and shrink the weave. Is calculated. The warp and weft threads extracted from the woven fabric are measured for 20 threads each, and the average value is shown.

(6) Woven fabric thickness Measure the woven fabric thickness at n = 10 in accordance with ANSI / AAMI / ISO 7198: 1998/2001, and calculate the average value and standard deviation.

(7) Permeability of woven fabrics The permeability of woven fabrics is measured in accordance with ANSI / AAMI / ISO 7198: 1998/2001. In the water permeability test, the measurement is performed at n = 5, and the average value thereof is taken.

(8) Rupture strength of woven fabrics In accordance with ANSI / AAMI / ISO 7198: 1998/2001, the rupture strength tests of woven fabrics were carried out before and after the following wear tests at n = 5, and the average value of the maximum test force at that time was used. Shown. The burst strength retention rate is calculated from the following formula.
Rupture strength retention rate (%) = Rupture strength after wear test / Rupture strength before wear test x 100
[Abrasion resistance test]
Using a Martindale wear tester that complies with JIS L 1096 8.19.5 E method, the test is performed with a pressing load for clothing (9 kPa) and the number of wears is 5000 times.

(9) Seam slip resistance (N)
Based on JIS L 1096 8.23.1, the seam slip-off method B method, prepare 10 test pieces with a sample size of 16 mm x 82 mm in the warp direction and the weft direction, respectively, and turn this test piece into the middle table for length. Fold it in half, sew 10 mm from the crease by reverse stitching one stitch at the beginning and end of sewing, and cut the crease. Hold the prepared test piece with a tensile tester so that the distance between the chucks is 30 mm, apply a load until the seam is broken, record the maximum load at that time, and calculate the average value of n = 10. ..

(10) Tear strength of woven fabric (N)
Based on JIS L 1096 8.17.3 C method (trapezoid method), warp direction x weft direction: 150 mm x 75 mm (warp tear), 41 mm x 82 mm (weft tear), 3 pieces each Prepare and make a 10mm cut in the center of one side of the long side. Pull the prepared test piece with a tensile tester until the dough is torn in two under the conditions of a chuck distance of 25 mm and a test speed of 15 mm / min for warp tearing and a chuck distance of 14 mm and a test speed of 8.5 mm / min for weft tearing. Record the maximum load at that time and calculate the average value of n = 3.

(11) Thread overlap ratio and CV value As shown in FIG. 1, the weft overlap ratio a passes through the front and back surfaces of the warp by X-ray CT of a woven fabric arbitrarily cut with a warp direction of 10 mm or more and a weft method of 20 mm or more. The number of overlapping parts between adjacent weft yarns and warp yarns is 50 or less at most. Two or more points are photographed at arbitrary points, and 20 or more overlapping parts between weft yarns calculated by the following formula (1). It is the average value of the overlap rate of.

The CV value of the thread overlap ratio a is calculated by the following formula (2).

As shown in FIG. 2, the CV values of the warp overlap rate A and the warp overlap rate A are determined from the X-ray CT image taken in the same manner as the measurement of the weft overlap rate according to the following equation (3):

, And the following equation (4):

, Each is calculated.
In FIG. 2, the warp overlap ratio C'is similarly calculated by = (B'+ B ") / C'.

[Example 1]
A polyester fiber with a total fineness of 31dtex / 22F, a single yarn fineness of 1.4dtex, a tensile strength of 5.0cN / dtex, and a tensile elongation of 31% is twisted 500 times / m (S direction twist) for the warp, and the total fineness is 42dtex for the weft. / 140F, single yarn fineness 0.3dtex, tensile strength 4.2cN / dtex, ultrafine fiber with tensile elongation 34% is twisted 100 times / m (S direction twist) to make a shuttle loom equipped with an electronic jacquard opening device. Then, a plain woven tubular seamless woven fabric having an inner diameter of 28.5 mm was produced with a warp tension of 0.7 g / dtex and a weft pull-out tension of 8 g (0.2 g / dtex). Further, this woven fabric was preheated (at 160 ° C. for 20 minutes), smelted (30 minutes × 3 times with hot water at 80 ° C.), and finally heat-set (180 ° C. for 20 minutes). The evaluation results of the obtained woven fabric are shown in Table 1 below.

[Example 2]
For the weft, ultrafine fibers with a total fineness of 42dtex / 140F, a single yarn fineness of 0.3dtex, a tensile strength of 4.2cN / dtex, and a tensile elongation of 34% and the regular fibers used for the warp of Example 1 were used 100 times / m (S direction). Twisting) Weaving, preheating set, scouring, and final heat setting were performed in the same manner as in Example 1 except that the fused and twisted fibers were used. The evaluation results of the obtained woven fabric are shown in Table 1 below.

[Example 3]
Except for the alternating use of ultrafine fibers having a total fineness of 42dtex / 140F, a single yarn fineness of 0.3dtex, a tensile strength of 4.2cN / dtex, and a tensile elongation of 34% for the weft, and the regular fibers used for the warp of Example 1. Weaving, pre-heating set, scouring, and final heat setting were performed in the same manner as in Example 1. The evaluation results of the obtained woven fabric are shown in Table 1 below.

[Example 4]
The weft uses ultrafine fibers with a total fineness of 23dtex / 140F, a single yarn fineness of 0.2dtex, a tensile strength of 4.0cN / dtex, and a tensile elongation of 39%, with a warp tension of 0.7g / dtex and a weft pull-out tension of 6g (0.3g / dtex). Weaving, preheating set, scouring, and final heat setting were performed in the same manner as in Example 1 except that a plain weave tubular seamless fabric having an inner diameter of 28.5 mm was produced. The evaluation results of the obtained woven fabric are shown in Table 1 below.

[Example 5]
Weft has a total fineness of 42dtex / 140F, a single yarn fineness of 0.3dtex, a tensile strength of 4.2cN / dtex, an ultrafine fiber with a tensile elongation of 34%, a total fineness of 42dtex / 8F, a single yarn fineness of 5.3dtex, and a tensile strength of 4.0cN / dtex. Same as Example 1 except that a non-twisted regular fiber with a tensile elongation of 37% and a fiber twisted 100 times / m (S direction twist) are woven at a weft drawing tension of 17 g (0.2 g / dtex). Weaving, pre-heating set, scouring, and final heat setting were performed. The evaluation results of the obtained woven fabric are shown in Table 1 below.

[Example 6]
Weaving, preheat set, scouring, and final heat set are the same as in Example 1, except that the composite yarn obtained by twisting the ultrafine fibers and regular fibers described in Example 2 is further interlaced with an air pressure of 0.02 Mpa. Was done. The evaluation results of the obtained woven fabric are shown in Table 1 below.

[Example 7]
A woven fabric was produced in the same manner as in Example 2 except that the pull-out tension of the composite yarn of the weft yarn was 35 g (0.5 g / dtex). The evaluation results of the obtained woven fabric are shown in Table 1 below.

[Comparative Example 1]
A woven fabric was produced in the same manner as in Example 4 except that a plain weave tubular seamless fabric having an inner diameter of 28.5 mm was produced with a warp tension of 1.6 g / dtex. The evaluation results of the obtained woven fabric are shown in Table 2 below. In the obtained woven fabric, the crimp rate of the weft was 14.8%, and the ultrafine fibers of the weft were projected on the surface of the woven fabric, so that the burst strength was significantly reduced after the abrasion test.

[Comparative Example 2]
A woven fabric was produced in the same manner as in Example 1 except that a plain weave tubular seamless fabric having an inner diameter of 28.5 mm was produced with a warp tension of 0.9 g / dtex and a weft pull-out tension of 3 g (0.07 g / dtex). The evaluation results of the obtained woven fabric are shown in Table 2 below. In the obtained woven fabric, the crimp rate of the weft was 14.5%, and the ultrafine fibers of the weft were projected on the surface of the woven fabric, so that the burst strength was significantly reduced after the abrasion test.

[Comparative Example 3]
A woven fabric was produced in the same manner as in Example 1 except that the warp density of Example 2 was set high (214 threads / inch) with respect to the warp density of 200 threads / inch. The evaluation results of the obtained woven fabric are shown in Table 2 below.

In the woven fabric for medical devices for chest diseases of the present invention, a specific polyester multifilament regular fiber is arranged on the warp, and a certain polyester multifilament ultrafine fiber containing a specific filament with a single yarn fineness of 0.5 dtex or less is arranged on the weft. By specifying the weaving shrinkage (crimp) rate in the range of 0.2% or more and 8.0% or less, the weft yarn crimp rate in the range of 3.0% or more and 14.0% or less, and the weft yarn crimp rate in a range larger than the warp yarn crimp rate. Since the protrusion of the ultrafine fibers to the surface of the woven fabric is suppressed and the wear resistance is improved, it can be suitably used as a woven fabric for medical equipment for chest diseases, which requires particularly high wear resistance.

a Weft overlap part a'Weft overlap part b Weft width b'Weft width b''Weft width c Adjacent two total weft width c'Adjacent two total weft width B Warp width B'War yarn width B''War yarn width C Two adjacent total warp widths C'Two adjacent total warp widths

Claims

A woven fabric for chest disease medical equipment composed of at least two types of polyester multifilaments having different single yarn fineness, and the single yarn fineness is the largest among the at least two types of polyester multifilaments, and the single yarn fineness is more than 0.5 dtex and 10 dtex or less. Polyester multifilaments containing the above filaments and having a total fineness of 7 dtex or more and 120 dtex or less are arranged in the warp yarns, and among the at least two types of polyester multifilaments, the single yarn fineness is the smallest, and the single yarn fineness is 0.5 dtex or less. Polyester multifilament containing the above filaments and having a total fineness of 7 dtex or more and 120 dtex or less is arranged on the weft yarn, and the weaving shrinkage (crimp) rate of the warp yarn conforming to the JIS L1096 8.7 B method is 0.2% or more and 8.0% or less. A woven fabric for a medical device for chest disease, wherein the crimp rate of the weft is 3.0% or more and 14.0% or less, and the crimp rate of the weft is larger than the crimp rate of the warp.
The woven fabric for a medical device for chest disease according to claim 1, wherein the polyester multifilament having the highest single yarn fineness has a single yarn fineness of more than 0.5 and 2.5 dtex or less.
A composite yarn of a polyester multifilament having a single yarn fineness of more than 0.5 dtex and 10 dtex or less and a polyester multifilament having a single yarn fineness of 0.5 dtex or less and having a total fineness of 20 dtex or more and 120 dtex or less is a warp yarn and / or a weft yarn. A woven fabric for chest disease medical devices, which is characterized by being arranged in.
The woven fabric for a medical device for chest disease according to claim 3, wherein the blending ratio of the polyester multifilament having a single yarn fineness of more than 0.5 dtex and 10 dtex or less in the composite yarn is 15% by weight or more and 65% by weight or less.
The chest disease medical treatment according to any one of claims 1 to 4, wherein the weft overlap rate (weft overlap rate) is 0.90 or more, and the warp overlap rate (warp overlap rate) is less than 0.90. Woven fabric for equipment.
The woven fabric for a chest disease medical device according to claim 5, wherein the CV value of the weft overlap rate is 0.1 or less, and the CV value of the warp overlap rate is 0.1 or less.
The burst strength of the woven fabric conforming to ANSI / AAMI / ISO 7198: 1998/2001 after the abrasion test of 5000 times using the Martindale abrasion tester conforming to JIS L 1096 8.19.5 E method is 140 N or more. The woven fabric for a medical device for chest disease according to any one of claims 1 to 6.
The woven fabric for a medical device for chest disease according to claim 7, wherein the retention rate of the burst strength before and after the wear test is 65% or more.
The woven fabric for a medical device for chest disease according to any one of claims 1 to 8, wherein the woven fabric conforming to ANSI / AAMI / ISO 7198: 1998/2001 has a water permeability of 400 cc / cm 2 / min or less.
A medical device for treating thoracic disease, wherein a metal member is sutured and fixed to the inner surface and / or outer surface of the woven fabric for thoracic disease medical device according to any one of claims 1 to 9.
The medical device for treating thoracic disease according to claim 10, wherein the medical device for treating thoracic disease is a device for treating thoracic aortic aneurysm.
The medical device for treating thoracic disease according to claim 10, wherein the medical device for treating thoracic disease is a device for thoracic aortic valve replacement.