JPH0445691Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a handpiece for a surgical ultrasonic scalpel for crushing or cutting and separating biological tissue by ultrasonic vibration.

[Prior art]

Surgical tools that utilize the ability to cut, cut, or crush living tissue using ultrasound include tools for cutting bones and joints and removing cancer cells in the fields of orthopedics and general surgery, and surgical tools for cataracts in the ophthalmology field. Furthermore, in dentistry, ultrasonic surgical tools for removing tartar and the like have been put into practical use.

These ultrasonic surgical tools basically consist of an ultrasonic vibration source that converts high-frequency current into ultrasonic vibration;
It consists of a horn that is connected to the vibration source and amplifies and transmits ultrasonic vibrations, and a working part (female part) at the tip of the horn that comes into contact with living tissue and crushes or cuts it. It is equipped with an irrigation mechanism that supplies irrigation liquid (washing liquid) such as physiological saline for cleaning, and a suction mechanism that suctions and removes crushed and emulsified cell debris.

In a conventional surgical ultrasonic scalpel handpiece equipped with such an irrigation mechanism and a suction mechanism, the irrigation pipe 26 is integrated with the suction pipe 21 by silver brazing, as shown in FIG. The rear side is screwed with a pipe stopper 22 located in the middle of the handpiece, and the front side is fixed with a suction port 2.
At point 3, a fixing joint 24 was silver-brazed to the suction pipe 21 and fixed by fitting it into the handpiece mantle 25. Therefore, even during surgery that does not require the supply of irrigation fluid, it is impossible to remove only the irrigation pipe 26, and the tip of the irrigation pipe 26 comes into contact with the horn 27, causing ultrasonic vibrations. There was a risk of metal powder being generated.

In order to eliminate these drawbacks of the conventional handpiece, the inventors of the present invention devised a handpiece having the structure shown in FIG. 4, and disclosed it in Japanese Utility Model Application Publication No. 150408/1983. This handpiece has an 8.
A square tip 33 is inserted near the tips of the horn 31 and irrigation pipe 32. The figure-of-eight chip is made of a material that has little effect on the ultrasonic vibrations of the horn 31, such as silicone resin, fluorine resin, polyamide resin, or polyacetal resin, and the distance between the horn 31 and the irrigation pipe 32 is This figure-of-eight tip 33 maintains a distance of about 2 mm, preventing the irrigation pipe 32 from coming into contact with the horn 31.

However, in order to accurately supply irrigation fluid to the surgical site during surgery, the position of the irrigation pipe 32 must always be kept above the handpiece, and the tip of the handpiece must be lowered. However, when deep within the body or when the surgical field is extremely narrow, the handpiece is difficult to use, making it difficult to perform a proper surgical procedure, resulting in an unnecessarily long surgical time. Also,
In surgery for brain tumors, etc., there is a surgical method in which the horn 31 of the handpiece is used with the horn 31 facing upward.In that case, there is a disadvantage that the irrigation fluid is not supplied to the surgical site but drips to the proximal side of the handpiece. It was difficult to use this method for surgical procedures.

[Purpose of invention]

The present invention solves these current problems with surgical instruments that utilize ultrasonic vibrations, that is, handpieces for ultrasonic scalpels. The object of the present invention is to provide a handpiece equipped with an irrigation mechanism that can properly supply water.

[Structure of the idea]

That is, the present invention uses a holding tip 13 to hold the horn 1 and the irrigation pipe 12 at a constant distance near the tip of a surgical handpiece that crushes or cuts and separates biological tissues by ultrasonic vibration. The holding tip 13 has an inner diameter smaller than the inner diameter of the irrigation pipe, and is inclined toward the horn 1 side as it goes to the tip of the horn, and its axis line is the same as that of the horn. This handpiece is characterized by having irrigation fluid passages that intersect near the tip.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is an overall view of a handpiece that is an embodiment of the present invention. The horn 1 and the vibrator 2 are mechanically connected with screws or the like, and the vibrator 2 is fixed to the grip part 4 by an appropriate method such as screws at the flange part 3 which is the node of the amplitude mode of the vibrator 2. , horn 1
The vibrator 2 is covered with a cover 5. Grip part 4
A cable 6 and a connector 7 for connecting to an ultrasonic oscillator for driving an electrostrictive vibrator, a magnetostrictive vibrator, etc. come out from the rear end side.

Inside the horn 1, blood generated at the surgical site,
A suction hole 8 is provided for suctioning and removing cell fragments crushed by the horn 1, and is connected to a suction pipe 10 via a pipe joint 9 connected to the outside of the cover 5 by an appropriate method. This suction pipe 10 is fixed to the side of the handpiece by a pipe joint 9 and a pipe stopper 11.

Similarly, the irrigation pipe 12 is fixed to the side of the handpiece with a pipe joint 9 and a pipe stopper 11, and its tip is attached to the horn by using a holding chip 13 as shown in FIG. It is held so as to maintain a constant distance from the tip of the The tip of the irrigation pipe 12 is inserted and fixed into the irrigation pipe holding hole 15 of the holding chip 13, and the insertion distance is
The thickness is preferably about 0.1 to 10 mm, preferably about 0.5 to 2 mm. Irrigation pipe 12 and holding chip 1
For fixing method 3, hold chip 1 with adhesive etc.
It is desirable to stick to 3. By hardening with an adhesive or the like, the problem of the retaining chip 13 coming off due to the pressure of the physiological saline supplied from the irrigation pipe 12 can be solved.

The inner diameter of the horn hole 14 of the holding chip 13 is made slightly larger than the horn 1 so as not to affect the vibration of the horn 1. For example, if the outer diameter of the horn 1 is 3 mm, the inner diameter of the horn hole 14 is 3.05 mm.
~3.4mm, preferably around 3.2mm. Furthermore, by providing the notch 17 on the side of the horn hole 14 of the holding chip 13, the influence of vibration on the horn 1 is further reduced. The holding chip is preferably made of a material that has excellent heat resistance, abrasion resistance, and slidability, and is less affected by ultrasonic vibration, such as fluorine resin, silicone resin, polyamide, polyacetal, and the like.

Irrigation liquid supplied from the tip of the irrigation pipe 12 passes through the irrigation liquid passage 16, which has an inner diameter smaller than that of the irrigation pipe 12 and is inclined toward the horn 1 side as it approaches the tip. The water is sprayed in a thinner stream at the tip of the horn 1, where it is atomized by ultrasonic vibrations and ejected toward the surgical site at the tip of the horn. Even if the irrigation pipe 12 is placed under the handpiece (for example, with the horn 1 facing upward), the irrigation fluid can be properly supplied to the surgical site. The length of the irrigation liquid passage 16 should be 0.5 mm or more, and in order to ensure the above effect, the length should be 1 mm.
It is desirable that the holding chip 13
In order to avoid making it unnecessarily large, it is preferable to keep it within 3 mm. Further, the inner diameter of the irrigation liquid passage does not need to be constant throughout, and may become smaller toward the tip of the horn, thereby making it possible to smooth the flow of the irrigation liquid.

[Effect of idea]

According to the handpiece of the present invention, the irrigation fluid passage in the holding chip that holds the irrigation pipe in the horn is narrow and slopes toward the horn as it goes toward the tip, so that the irrigation fluid can be absorbed more easily. A thin stream of water is sprayed at the tip of the horn, where it becomes atomized and is ejected toward the surgical site at the tip of the horn, so if the surgical field is deep within the body or is extremely complex, Even if the position of the irrigation pipe of the handpiece is changed (for example, even if the irrigation pipe is located on the side or bottom of the handpiece), the irrigation fluid can be properly supplied to the surgical field without dripping. , which previously could not be used,
It can be used without any problem in surgical procedures in neurosurgery in which the horn side of the handpiece is directed upward, making it extremely useful as a surgical tool.

[Brief explanation of the drawing]

FIG. 1 is an overall view of a handpiece that is an embodiment of the present invention. FIG. 2 is a diagram showing an example of the holding tip of the handpiece used in the present invention. Third
FIG. 4 is an overall view showing a conventional handpiece.

Claims (1)

[Claims for Utility Model Registration] (1) In the vicinity of the tip of a surgical handpiece for crushing or cutting biological tissue by ultrasonic vibration, the distance between the horn and irrigation pipe is adjusted using a holding tip. A handpiece that is held constant and has an inner diameter smaller than the inner diameter of the irrigation pipe in the holding tip, is inclined toward the horn side as it approaches the tip of the horn, and has its axis line 1. A handpiece characterized in that the irrigation fluid passages intersect near the tip of the horn. (2) The handpiece according to claim 1, wherein the diameter of the irrigation fluid passage in the holding tip decreases toward the tip.