JP2003038508A - Bone joining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bone joining device made easy in joining work and capable of certainly holding a strong fixed state at an accurate position. SOLUTION: The bone joining device is equipped with the lug screw threaded with an object to be joined from one bone side to other bone side, a tube plate arranged along the side surface of one bone and having a through-hole, the tube arranged between the lug screw and the tube plate to be attached to the tube plate in a detachable manner and having the hollow part, in which the base part of the lug screw is inserted, corresponding to the through-hole and the compression screw threaded with the lug screw from the outside of the tube plate through the through-hole and the hollow part of the tube and pulling the lug screw, in its turn, the other bone toward one bone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a bone joining device used for joining a fractured part of a femur in a neck fracture, and more particularly to a bone joining device for various types of fractures. The present invention relates to a device devised so that it can be joined and a strong fixed state can be easily obtained.

[0002]

2. Description of the Related Art As a bone joining device, for example, there is one disclosed in a registered utility model publication related to utility model registration No. 3044923. This is due to the applicant of the present patent. The structure is shown in FIG. Figure 8 shows femur 1
9 is a diagram showing a configuration of a bone joining device for joining a fractured part to the neck 101a of No. 01, and the fractured part is indicated by a symbol A in FIG.

The structure of the bone joining device will be described below.
First, there is the tube plate 103, and the tube plate 103 is arranged along the side of the femur 101. A hemispherical receiving portion 105 is formed on the upper end of the tube plate 103 in FIG. A through hole 107 is formed in the hemispherical receiving portion 105.

A tube 109 is arranged inside the receiving portion 105 (in the hole formed on the femur 101 side). The tube 109 has a hemispherical head portion 111, and is movably engaged with the receiving portion 105 via the head portion 111. Also, the tube 109 is
The hollow portion 113 is provided and a female screw portion 115 is formed on the inner peripheral side of the head portion 111. Also, the receiving portion 1
The surface of 05 is satin-like (roughened), and the surface of the head 111 is also satin-like. As a result, a large frictional force is obtained and the fixing force is increased.

Further, there is a lag screw 117, and this lug screw 117 is provided with a shaft portion 119 having a hexagonal cross section, and a male screw portion 121 is provided at the tip end portion of the shaft portion 119.
Are formed. A female screw portion 123 is formed on the inner peripheral surface of the shaft portion 119 on the base side. The lag screw 117 is inserted into a hole formed in advance from the femur 101 to the bone head 125, and is screwed and joined to a female screw portion formed in the hole on the bone head 125 side.

The receiving portion 1 of the tube plate 103 is also provided.
A set screw 127 is arranged outside 05. The set screw 127 includes the tube 10 described above.
A male screw portion 129 is formed to be screwed into the female screw portion 115 of the No. 9. A compression screw 131 is arranged outside the set screw 127, and the compression screw 131 is formed with a male screw portion 133 that is screwed into the female screw portion 123 on the lag screw 117 side.

Further, the tube plate 103 is formed with a plurality of fixing screw holes 137 through which the cortical screw 135 as a fixing screw is inserted. or,
In the tube plate 103, a fixing screw hole 141 for inserting a cantilever screw 139 as a fixing screw.
Are formed.

According to the above configuration, for example, the femur 101
If a fracture occurs in the neck 101a of the femur, the femur 10
A hole having a predetermined depth is drilled from 1 to the head 125. The female screw portion is threaded on the bone head 125 side of the bored hole. Next, the lug screw 117 is screwed into the female screw portion, and the tube 109 is inserted and arranged. At that time, the base portion of the lag screw 117 is inserted into the hollow portion 113 in the tube 109.

The tube plate 103 is arranged along the side of the femur 101. Then, the set screw 127 is screwed into the female screw portion 115 of the head portion 111 of the tube 109 through the through hole 107 of the receiving portion 105 of the tube plate 103. Thereby, the tube 109 is fixed to the tube plate 103. Next, set the compression screw 131 to the set screw 127.
It is screwed into the female screw portion 123 at the base of the lag screw 117. Thereby, the lag screw 117 and thus the head 125 are pulled toward the femur 101 side. Then, the fractured portion A is pressed. After that, a plurality of cortical screws 13 are provided from the outside of the tube plate 103.
5. The whole can be fixed by screwing the canister screw 141 into the femur 101.

[0010]

The above-mentioned conventional structure has the following problems. That is, according to the conventional configuration, the head portion 111 of the tube 109 and the receiving portion 105 of the tube plate 103 both have a hemispherical shape, and the tube 109 can freely move in all directions with respect to the tube plate 103. Yes, tube 1
09 and then the tube plate 1 of the lag screw 117
It is possible to deal with any directionality with respect to 03. However, regarding the joining of the set screw 127 and the tube 109, there is a problem that the joining work is troublesome. Further, after the set screw 127 is joined to the tube 109, a positional deviation occurs within a play range between the set screw 127 and the through hole 107 of the tube plate 103, which results in firmness at the correct position. There was a problem that the fixed state would be lost.

The present invention has been made on the basis of the above points, and an object of the present invention is to facilitate the joining work and to surely maintain a strong fixed state at a correct position. To provide a simple osteosynthesis device.

[0012]

In order to achieve the above object, a bone joining device according to claim 1 of the present invention comprises a lag screw screwed from one bone side to be joined toward the other bone side, A tube plate having a through hole disposed along the side surface of the one bone, a hollow portion corresponding to the through hole that is disposed between the lug screw and the tube plate and is detachably attached to the tube plate. A tube provided with the base of the lag screw in the hollow portion, and a lug screw screwed into the lag screw from the outside of the tube plate through the through hole and the hollow portion of the tube, and thus the other bone is one bone. And a compression screw pulled to the side. Further, an osteosynthesis device according to a second aspect is the osteosynthesis device according to the first aspect, wherein the tube is inserted into an engagement recess provided in the tube plate, and a predetermined portion with respect to the insertion part. It is characterized in that it is constituted by a cylindrical body provided at an angle of and having a hollow portion. Further, the bone joint device according to claim 3 is the bone joint device according to claim 2, wherein the insertion portion of the tube is for fixing screw insertion which is coincident with a fixing screw insertion hole formed on the tube plate side. It is characterized in that holes are formed. Further, an osteosynthesis device according to a fourth aspect is the second aspect.
Alternatively, in the osteosynthesis device according to a third aspect of the present invention, the cylindrical body is integrally provided with the insertion portion at a predetermined neck angle and a predetermined anteversion angle. An osteosynthesis device according to claim 5 is the osteosynthesis device according to any one of claims 1 to 4, wherein the tube plate is provided with an extension portion, and the extension portion is provided with a fixing screw differential. An insertion hole is formed, and the fixing screw is screwed up to the other bone through the fixing screw insertion hole. Further, an osteosynthesis device according to claim 6 is the osteosynthesis device according to any one of claims 1 to 5, wherein the tubular body has an arbitrary neck angle and an arbitrary anteversion angle with respect to the insertion portion. It is characterized in that a plurality of types of tubes integrally provided are prepared and a tube having an optimum cervical angle and anterior vortex angle is selected and used according to the situation of the joint site. .

That is, in the case of the bone joining device according to the present invention, the lag screw screwed from one bone side to be joined toward the other bone side, and the lag screw arranged along the side surface of the one bone. A tube plate having a through hole, a tube which is arranged between the lug screw and the tube plate and is detachably attached to the tube plate, and a base portion of the lag screw is inserted into a hollow part corresponding to the through hole; And a compression screw that is screwed into the lag screw from the outside of the tube plate through the through hole and the hollow portion of the tube and that pulls the other bone to the one bone side. At that time, the tube is removably attached to the tube plate, and its position is automatically determined by attaching it at the time of use. Therefore, positioning of the tube with respect to the tube plate becomes easier, and in the end,
The joining operation itself can be facilitated. Also, the joining work can be facilitated by the small number of parts. At that time, the tube may be composed of an insertion portion to be inserted into an engagement recess provided in the tube plate, and a tubular body having a hollow portion provided at a predetermined angle with respect to the insertion portion. Conceivable. In this case, the tube can be integrally attached to the tube plate simply by inserting the insertion portion into the engagement recess. Further, it is conceivable to form a fixing screw insertion hole in the insertion portion of the tube that matches the fixing screw insertion hole formed on the tube plate side, and fix it in the overlapping fixing screw insertion hole. By inserting the screw and screwing it in, the tube is securely prevented from coming off the tube plate. Further, it is conceivable that the cylindrical body is integrally provided with the insertion portion at a predetermined neck angle and a predetermined anteversion angle. Further, it is conceivable that an extension portion is provided in the tube plate, a fixing screw hole is formed in the extension portion, and the fixing screw is screwed up to the other bone through the fixing screw hole. Therefore, it is possible to prevent the positional deviation after joining. Also, prepare multiple types of tubes in which the tubular body is integrally provided at the insertion part with an arbitrary cervical angle and an arbitrary anteversion angle, and optimize the cervical angle according to the situation of the joint site. It is conceivable to select and use a tube with an anteversion angle, so that it is possible to cope with various types of fractures.

[0014]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing a partial configuration of the osteosynthesis device according to the present embodiment, and FIG.
[Fig. 3] is a view showing how a fractured part of a femur is joined using the bone joining device. In the case of this embodiment,
As shown in FIG. 2, a bone fracture occurs in the neck 1a of the femur 1, and FIG. 3 is a diagram showing the configuration of a bone joining device for joining the fractured parts. Reference numeral A in FIG. 2 indicates the fractured part. Further, reference numeral 3 in FIG. 2 is a bone head.

The structure of the bone joint device will be described below.
First, there is a tube plate 5, and this tube plate 5 is arranged along the side of the femur 1 as shown in FIG. The tube plate 5 is shown in FIG.
As shown in FIG. 3, the through hole 7 is formed so as to be inclined to one end side, and another four fixing screw holes 9 are formed at a predetermined pitch from the through hole 7 toward the other end side. I have it. Further, as shown in FIG. 3C, an engaging recess 10 is provided on the back side of the tube plate 5, and a guide groove 11 is formed on the inner peripheral side of the engaging recess 10.
Further, as shown in FIG. 4, the back side of the tube plate 5 is formed in a gentle arc shape along the femur 1.

As shown in FIGS. 1 and 2, the tube 13 is detachably attached to the tube plate 5 having the above-mentioned structure. The tube 13 is composed of a plate 15 as an insertion portion and a cylindrical body 17 which is integrated with the plate 15 in the vertical direction at a predetermined neck angle (α degree). The plate 15 is provided with a stepped portion 16 on its outer peripheral portion. The plate 15 is the stepped portion 1
6 is a guide groove 1 provided on the tube plate 5 side.
It is inserted into 1 and is guided to be attached to and detached from the engaging recess 10. 1 and 2 show a state in which the tube 13 is attached to the tube plate 5.

A hole 19 is formed in the connecting portion of the plate 15 with the cylindrical body 17, and another fixing screw hole 21 is formed below the hole 19. Then, the hole 19 matches the through hole 9 on the tube plate 5 side, and the fixing screw hole 21 matches the fixing screw hole 9 on the tube plate 5 side. Further, the back side of the plate 15 is formed in a gentle arc shape along the femur 1 like the tube plate 5.
A hollow portion 23 is formed in the cylindrical body 17.

A lag screw 25 is inserted in the cylindrical body 17. A male screw portion 27 is formed at the tip of this lag screw 25. The male screw portion 27 has a tap function, and therefore, the outer peripheral portion is formed in a sawtooth shape (a serrated shape), and the notch portion 27a is formed at one position in the circumferential direction. A hollow portion 29 is formed in the lag screw 25, and a female screw portion 31 is formed in the hollow portion 29. Further, a tubular member 33 for preventing the slip-off is press-fitted and fixed to the base portion of the lag screw 25. The inner peripheral surface of the cylindrical member 33 is hexagonal, and the hexagonal portion at the tip of a jig (not shown) is inserted. The jig is used when screwing the lag screw 25 into the bone head 3 side.

In FIG. 2, reference numeral 35 is a compression screw, and reference numeral 37 is a cortical screw as a fixing screw. Cortical screw 3
7 is also screwed into the other three fixing screw holes 9, but only one is shown.

The operation will be described based on the above configuration. For example, a case where a fracture occurs in the neck 1a of the femur 1 will be described as an example. First, a hole having a predetermined depth is drilled from the femur 1 to the head 3. Female thread processing is performed on the bone head 3 side within the bored hole. Then, the lag screw 25 is screwed in there through the male screw portion 27. that time,
The base of the lag screw 25 is the cylindrical body 1 in the tube 13.
7 is inserted in the hollow portion 23.

To explain the above operation in detail, first, the base portion of the lag screw 25 is inserted into the hollow portion 23 of the tubular body 17 of the tube 13. Further, the tube member 33 is inserted from the side opposite to the hollow portion 32 of the tube body 17 of the tube 13 and the tip of a jig (not shown) is inserted. Then, while the cylindrical member 33 is press-fitted and fixed to the base portion of the lag screw 25, the male screw portion 27
It is screwed in through. It should be noted that the lag screw 25 itself is provided with a tap function so that when the lag screw 25 is removed after a predetermined curing return after joining, the lag screw 25 is pulled out while performing thread cutting using the tap function.

By pressing and fixing the tubular member 33 to the base of the lag screw 25, the lag screw 25 is prevented from coming off the tube 13. In other words, if you try to pull out the lag screw 25 to the tip side of the tube 13,
The tubular member 33 comes into contact with the edge of the hollow portion 23 of the tubular body 17 of the tube 13 to prevent the tubular member 33 from coming off further. On the contrary, when the lag screw 25 is to be pulled out toward the base side of the tube 13, the male screw portion 27 causes the hollow portion 2 of the tubular body 17 of the tube 13 to be removed.
It comes into contact with the edge portion of No. 3 and is prevented from coming off further.

Next, the tube plate 5 is arranged along the side portion of the femur 1, and at that time, the plate 15 of the tube 13 is inserted into the engaging recess 10 of the tube plate 5. Next, compression screw 3
5 is inserted into the cylindrical body 17 of the tube 13 and screwed into the female screw portion 31 of the base portion of the lag screw 25. Thereby, the lag screw 25 and thus the head 3 are pulled toward the femur 1 side. Then, the fractured portion A is pressed. After that, a plurality of cortical screws 37 are screwed into the femur 1 from the outside of the tube plate 5 through the fixing screw holes 9 to fix the whole body. Incidentally, since the weight of the patient acts on the fractured portion A after the compression portion 35 is pressed by the compression screw 35, the compression screw 35 may be removed.

According to this embodiment, the following effects can be obtained. First, the joining work at the fractured portion A of the femur 1, that is, the joining work by the bone joining device is facilitated. This is because the plate 15 on the tube 13 side is fixed when the tube 13 is fixed to the tube plate 5.
This is because it can be attached only by engaging in the engaging recess 10 along the guide groove 11 on the tube plate 5 side. Further, in the tube 13, the angle formed by the cylindrical body 17 and the plate 15, that is, the vertical neck angle (α degree) in FIG. 2 and the lateral anteversion angle in FIG. 1 (in the case of this embodiment) Is 0 degree), the optimum one is selected from a large number of prepared ones and used. Therefore, the fractured portion A is also appropriately dealt with. Further, the plate 15 of the tube 13 is inserted into the engaging recess 10 of the tube plate 5, and the fixing screw holes 9 and 21 of both are overlapped, and the cortical screw 37 is inserted.
Since the tube 13 is fixed by the above, the tube 13 is reliably prevented from coming off the tube plate 5. Further, since the back surface side of the tube plate 5 and the back surface side of the plate 15 of the tube 13 are formed in a gentle arc shape, they can follow the side portion of the femur 1 with almost no gap, thereby providing a good attachment. You can get the status. Further, the tube plate 5 can be slightly moved in the left-right direction along the side portion of the femur 1, whereby a certain anteversion angle can be dealt with. That is, even if the tube 13 has no anteversion angle, it can be attached in the same arrangement as that in which the anteversion angle is provided depending on the position of the tube plate 5.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the case of the second embodiment, an extension 51 is provided at the upper end of the tube plate 5 in the first embodiment, and a hole 53 for inserting a fixing screw is formed in the extension 51. is there. Above extension 5
Reference numeral 1 is extended in a state of being inclined by a predetermined angle, and is configured so as to extend along the side surface of the femur 1. Since the other structure is the same as that of the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

In the case of the second embodiment, the long cortical screw 55 can be screwed up to the head 3 of the head through the hole 53 of the extension portion 51, thereby making it more rigid. A fixed state can be obtained. In other words, since the tube body 17 of the tube 13 is fixed vertically by sandwiching the tube body 17, it is possible to reliably prevent positional displacement and maintain a strong fixed state, and prevent inadvertent rotation of the joining device. . In addition, it goes without saying that the same effects as those of the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIG. As described in the first embodiment, in the tube 13, the tubular body 17 is the plate 15
On the other hand, it is integrated at a predetermined angle in the vertical direction and the horizontal direction. In the third embodiment, the tube 13 provided with an angle not only in the vertical direction but also in the horizontal direction.
Is shown.

That is, as shown in FIG. 7 (b), a neck angle (α degree) is provided in the vertical direction. or,
As shown in Fig. 7 (a), the anteversion angle (β degree)
The angle is provided. These angles will be determined in consideration of the condition of the fractured part A to be applied. A plurality of types of neck angle (α degrees) and anteversion angle (β degrees) are prepared in advance. Then, the tube 13 having the optimum neck angle (α degrees) and anteversion angle (β degrees) is selected and used according to the condition of the fractured portion A.

The above-mentioned anteversion angle (β degree) is usually
Looking at the attachment part of the human femur 1, it is attached in a state of being inclined forward. The anteversion angle (β degree) is for absorbing such a tilt, and thereby a stronger joined state can be obtained.

The present invention is not limited to the first to third embodiments. In the case of the first to third embodiments, the fracture of the femur has been described as an example,
The present invention is not limited thereto, and can be applied to various bone fractures. Further, the components shown in the first to third embodiments, for example, the tube, are examples, and the angle of the cylindrical body with respect to the plate may be arbitrarily set.

[0031]

As described in detail above, according to the bone joining device of the present invention, first, the joining work at the fractured portion, that is, the joining work by the bone joining device is facilitated. This is because the tube is configured to be attachable to and detachable from the tube plate so that the tube can be easily attached and fixed. Also, the tube is reliably prevented from coming off the tube plate. Further, by providing an extension portion and screwing a fixing screw into the extension portion as well, it is possible to obtain a stronger joined state. In addition, if multiple types of tube body angles are prepared in advance, the optimum one can be selected and used according to various cases, thereby improving workability of the joining work and joining structure. The quality of can be improved.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of the present invention and is a front view showing a configuration of an osteosynthesis device.

FIG. 2 is a view showing the first embodiment of the present invention and is a side view showing a state in which a fractured part of a femur is joined using a bone joining device.

FIG. 3 is a diagram showing a first embodiment of the present invention, (a)
Is a plan view of the tube plate, (b) is a side view of the tube plate, and (c) is a rear view of the tube plate.

FIG. 4 is a diagram showing a first embodiment of the present invention, (a)
Is a view taken along the line aa in FIG. 3 (b), and FIG. 3 (b) is FIG. 3 (b).
It is a bb arrow line view of.

FIG. 5 is a view showing a second embodiment of the present invention, and is a front view showing a configuration of an osteosynthesis device.

FIG. 6 is a view showing a second embodiment of the present invention, and is a side view showing a state in which a fractured part of a femur is joined using a bone joining device.

FIG. 7 is a diagram showing a second embodiment of the present invention, (a)
Is a plan view of the tube, (b) is a side view of the tube,
(C) is a cross-sectional surface of the tube.

FIG. 8 is a view showing a conventional example, showing how bone is joined by a bone joining device.

[Explanation of symbols]

1 femur 1a Femoral neck 3 head of bone 5 tube plate 13 tubes 25 rag screw 35 compression screw 37,55 cortical screw (fixing screw) A fractured part

Claims (6)

[Claims] 1. A lug screw screwed from one bone side to be joined toward the other bone side, a tube plate disposed along a side surface of the one bone and having a through hole, the lag screw and tube. A tube which is disposed between the plate and a tube plate which is detachably attached to the tube plate and which has a hollow portion corresponding to the through hole and into which the base portion of the lag screw is inserted; And a compression screw that is screwed into the lag screw from the outside through the through hole and the hollow portion of the tube and that pulls the other bone to the one bone side. 2. The osteosynthesis device according to claim 1, wherein the tube is a hollow portion provided at an insertion portion to be inserted into an engagement recess provided in the tube plate and at a predetermined angle with respect to the insertion portion. An osteosynthesis device comprising: a tubular body having a section. 3. The osteosynthesis device according to claim 2, wherein the insertion portion of the tube is provided with a fixing screw hole that is coincident with the fixing screw hole formed on the tube plate side. Osteosynthesis device. 4. The osteosynthesis device according to claim 2 or 3, wherein the tubular body is integrally provided with the insertion portion at a predetermined neck angle and a predetermined anteversion angle. An osteosynthesis device characterized by: 5. The osteosynthesis device according to claim 1, wherein the tube plate is provided with an extension portion, and the extension portion is provided with a fixing screw hole. A bone-bonding device characterized in that a fixing screw is screwed into the other bone through the fixing screw hole. 6. The osteosynthesis device according to claim 1, wherein the tubular body is integrally provided with respect to the insertion portion at an arbitrary neck angle and an arbitrary anteversion angle. An osteosynthesis device characterized in that a plurality of types of tubes are prepared, and a tube having an optimal neck angle and anteversion angle is selected and used according to the condition of the joint site.