JP2523307Y2 - Ultrasound surgical instruments - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic surgical instrument, and more particularly to an ultrasonic surgical instrument used for cataract surgery.

[0002]

2. Description of the Related Art An ultrasonic surgical device used for abdominal surgery of a liver or the like is a device for increasing the amplitude of ultrasonic vibration generated by a vibrator using a surgical tool to crush living tissue. Surgical instruments used for ultrasonic surgical instruments are generally pipe-shaped instruments having a uniform inner diameter.

[0003]

[Problem to be Solved by the Invention] Here, the tip of the surgical tool comes into contact with the tissue during the operation, and the tissue is crushed by applying tens of thousands of impacts per second to the tissue. Therefore, it is desirable that the crushing force of the surgical tool be enhanced.

[0004] In addition, air bubbles due to cavitation are generated from the distal end surface of the surgical tool which forms a plane perpendicular to the traveling direction of the ultrasonic waves. The problem is that the crushed portion of the surgical site is difficult to visually recognize due to the bubbles due to the small size.

Accordingly, an object of the present invention is to provide a surgical instrument for an ultrasonic surgical instrument capable of increasing the crushing force of the surgical instrument and reducing the occurrence of cavitation from the distal end of the surgical instrument.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tube comprising a tip portion for crushing tissue and a non-tip portion connected to the tip portion and transmitting ultrasonic vibration to the tip portion. In the surgical instrument for an ultrasonic surgical instrument for cataract, a small-diameter hole is formed uniformly in the tube axis direction in the non-tip portion, whereby the non-tip portion is formed to be thick, and the tip portion has The large-diameter hole communicating with the small-diameter hole is formed uniformly, whereby the tip portion is formed to be thin, and the first crushing surface forming the tip surface of the tip portion is formed obliquely to the pipe axis direction, The second crushing surface, which is exposed on the tissue side as a step between the thick non-tip portion and the thin tip portion, is formed perpendicular to the tube axis direction.

[0007]

In the present invention, since the first crushing surface at the tip portion is formed to be thin and oblique, it is possible to reduce bubbles caused by cavitation generated in the crushing portion by ultrasonic vibration and to visually recognize the crushing portion. Performance can be improved.

The second crushing surface, which is exposed on the tissue side as a step between the thin tip portion and the thick non-tip portion, is formed perpendicular to the tube axis direction, so that the first crushing surface is formed. The crushing force is complemented, enabling efficient and smooth crushing of the entire surgical instrument. That is,
In the process of sucking the initially crushed tissue at the distal end portion and entering the tube axis, the tissue is crushed again by the next edge formed by the step. Such secondary crushing enhances the crushing effect.

Further, since the small-diameter hole is uniformly formed in the non-tip portion in the axial direction of the tube and the non-tip portion is formed to be thick, the strength and durability of the surgical instrument can be improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a surgical instrument A for an ultrasonic surgical instrument
Has a cylindrical shaft hole 2 formed therein in the axial direction, and this shaft hole 2 is usually connected to a suction device, and is configured to suction a crushed tissue piece. In the distal end portion 1 of the surgical instrument A, the shaft hole 2 has a large diameter portion 21 at the opening.
(A tip portion), and a small-diameter portion 22 (non-tip portion) is formed inside the large-diameter portion 21 so as to be connected to the large-diameter portion 21.
A stepped inner end surface (step) 4 is formed at the boundary between the small-diameter portion 22 and. In other words, the inner diameter of the surgical tool decreases stepwise on the way from the opening 5 to the inside. Further, the distal end face 3 of the opening has an elliptical shape cut obliquely. The surgical instrument A is made of titanium or a titanium alloy in order to obtain corrosion resistance and mechanical durability.

The use state of the surgical instrument A for the ultrasonic surgical instrument will be described. This surgical instrument A is connected to a vibrator in an ultrasonic surgical device, amplifies ultrasonic waves generated by the vibrator,
It touches human tissue and makes tens of thousands of impacts per second to crush the tissue. The crushed tissue piece is inserted into the shaft hole 2 through the opening 5.
Is sucked by a suction device to which is connected. During this crush,
Since the surgical instrument based on the present invention has a double end face near the tip (the first crush face formed on the large diameter part 21 and the second crush face formed on the tip of the small diameter part 22), The number of edges can be increased, and the crushing force can be increased. In addition, since the tip is formed diagonally, cavitation can be reduced, so that the visibility of the operative part is improved, and the diagonal shape makes the visibility of the operative part easier to see hidden parts. Can be good.

Next, FIG. 2 shows a reference example of the present invention.
(A) and (B) show a surgical instrument B for an ultrasonic surgical instrument. This reference example has substantially the same configuration as that of the embodiment of the present invention, but the distal end face 3 of the surgical instrument forms a surface perpendicular to the axial direction. With such a configuration, there is no effect of reducing cavitation because there are more vertical planes than in the first embodiment, and the visibility is not as good as in the first embodiment. However, since the edges due to the steps increase, the crushing force increases. Can be obtained. The state of use is the same as that of the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing another reference example, and if (a) and (b) are used, the number of vertical surfaces can be reduced, so that the generation of bubbles due to cavitation is reduced. be able to. Further, according to (c), since there is no plane perpendicular to the axial direction, the generation of bubbles due to cavitation can be suppressed. As another reference example, it is possible to provide not only one step but also two or more steps of inner diameter.

[0015]

[Effects of the Invention] The present invention is configured as described above, and the first crushing surface at the tip portion is formed to be thin and diagonal, so that bubbles caused by cavitation generated in the crushing portion by ultrasonic vibration can be reduced. Can be. As a result, in the case of surgery where the visibility of the surgical site is narrow, such as surgery for cataracts, etc., the surgical site can be easily visually recognized, and since the end is cut diagonally, the surgical site can be visually recognized from the gap at the tip There is also an effect that it is easy to do.

Further, the second crushing surface exposed on the tissue side as a step between the thin tip portion and the thick non-tip portion is formed perpendicular to the tube axis direction, so that the first crushing surface is The crushing force is complemented, enabling efficient and smooth crushing of the entire surgical instrument. That is,
In the process of sucking the initially crushed tissue at the distal end portion and entering the tube axis, the tissue is crushed again by the next edge formed by the step. Such secondary crushing enhances the crushing effect.

Furthermore, the small diameter hole is uniformly formed in the non-tip portion in the axial direction of the tube, and the non-tip portion is formed thick, so that the strength and durability of the surgical instrument can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing a distal end portion of a surgical instrument, (a) is a perspective view thereof, and (b) is a cross-sectional view taken along line XX in (a).

FIG. 2 is a diagram showing a distal end portion of a surgical instrument according to a reference example;
(A) is a perspective view, (B) is X in (A).
It is -X sectional drawing.

FIG. 3 is a longitudinal sectional view showing a distal end of a surgical tool according to another reference example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surgical tool front-end | tip 2 Shaft hole 3 Front-end | tip end surface 4 Internal end-face 5 Opening 21 Large-diameter part 22 Small-diameter part

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideaki Tanaka 6-22-1, Mure, Mitaka-shi, Tokyo Aloka Co., Ltd. Examiner Yoshito Inazumi (56) References JP-A-63-11147 (JP, A) JP-A-1-232947 (JP, A) JP-A-3-234251 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A surgical instrument for an ultrasonic surgical instrument for cataract, comprising a tube having a tip portion for performing tissue crushing and a non-tip portion connected to the tip portion and transmitting ultrasonic vibration to the tip portion. A small-diameter hole is formed uniformly in the tube axis direction in the portion, whereby the non-tip portion is formed to be thick, and a large-diameter hole communicating with the small-diameter hole is formed in the tip portion in a uniform manner. The tip portion is formed to be thin, the first crushing surface forming the tip surface of the tip portion is formed obliquely with respect to the pipe axis direction, and as a step between the non-tip portion and the thin tip portion in the thick portion. The surgical instrument for an ultrasonic surgical instrument, wherein the second crushing surface exposed on the tissue side is formed perpendicular to the tube axis direction.