JP2601618B2 - Ultrasonic surgical instrument tip - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip for an ophthalmic ultrasonic surgical instrument, and more particularly to a technique for transmitting ultrasonic vibration to an affected part to crush and aspirate cataract tissue in a lens removing operation for supplying a perfusate. The present invention relates to a tip for an ultrasonic surgical instrument used for a medical device.

[0002]

2. Description of the Related Art In an ophthalmic ultrasonic surgical instrument currently widely used in the medical field, the amplitude of ultrasonic vibration generated by a vibrator is amplified to a level at which an affected tissue can be crushed by an ultrasonic chip. Then, the amplified ultrasonic vibration is transmitted to the affected part to crush the cataract tissue in the affected part, and the crushed tissue pieces are sucked and removed together with the perfusate.

In FIG. 5, which shows an example of a conventional ophthalmic surgical instrument, a vibrator 31 converts an electric signal supplied from a power supply (not shown) into ultrasonic vibration. And the vibrator 3
1 is formed integrally with the transmission pipe 34,
Transmits the ultrasonic vibration generated by the vibrator 31. At the other end of the transmission tube 34, a pipe-shaped tapered tip 10
The tip 10a amplifies the amplitude of the ultrasonic vibration to a level at which the diseased tissue can be crushed, and crushes and emulsifies the diseased tissue by abutting its tip against the diseased portion.

[0004] A cylindrical and tapered protective tube 38 is provided on the outer periphery of the chip 10 a and the transmission tube 34, and the protection tube 38 is formed of the vibrator 31 and the transmission tube 34.
Is connected to the outer cylinder 44 containing the. The outer cylinder 44
Is provided with a perfusate supply pipe 46. The tip 10a and the transmission pipe 34, the outer cylinder 44 and the protection pipe 38
An irrigation liquid supply passage 42 for supplying an irrigation liquid, which also serves to cool and clean the affected part and maintain the pressure in the anterior chamber of the eyeball, is formed between them. An irrigation liquid suction passage 36 communicates with the center of the vibrator 31, the transmission tube 34, and the tip 10a on the axis.

In the ultrasonic surgical instrument having the above-described configuration, the distal end of the tip 10 a is brought into contact with the affected part, and the affected part is crushed by the ultrasonic vibration transmitted from the vibrator 31.
At this time, the perfusate from the perfusate supply pipe 46 flows through the perfusate supply passage 42 to cool and clean the affected part and maintain the pressure in the anterior chamber of the eyeball. Thereafter, the perfusate is sucked and removed together with the crushed tissue pieces through the perfusate suction passage 36 by a suction means (not shown).

Here, as shown in FIG. 4 (a), the chip 10a has a thread groove portion 1 having a thread groove at an end on the vibrator side.
4 and has a structure detachable from the transmission tube 34.
On the outer periphery of the wrench hook portion 20a to facilitate connection, wrench grooves 22a, 2
3a are formed.

[0007]

However, in the conventional ultrasonic surgical instrument tip, FIGS. 4 (a) and 4 (b)
As shown in the figure, since the wall surface 30 perpendicular to the vibration direction of the tip has a relatively large area in the wrench grooves 22a and 23a, cavitation occurs in the perfusate due to the vertical wall surface 30 and the The perfusate containing the generated air bubbles flows into the anterior chamber of the eyeball, and causes a problem that the surgeon performing an operation using a microscope disturbs the visual field of the affected part.

Accordingly, the present invention is directed to an ultrasonic surgical instrument tip used in a surgical operation in which a perfusion solution is refluxed, and which has a wrench groove having a shape capable of minimizing the occurrence of cavitation. It is intended to provide a skillful chip.

[0009]

SUMMARY OF THE INVENTION The present invention relates to an ultrasonic surgical instrument tip connected to a transducer side main body, transmitting ultrasonic vibration of the transducer, and crushing a living tissue by the ultrasonic vibration of the distal end portion. The wrench groove into which the wrench fits for attaching and detaching the chip to and from the vibrator-side body has an inclined surface inclined with respect to the axial direction of the chip.

[0010]

In the ultrasonic surgical instrument tip according to the present invention, since the wrench groove has an inclined surface inclined with respect to the axial direction of the tip, the wall surface is perpendicular to the vibration direction of the tip. Is reduced, and bubbles generated by cavitation in the perfusate can be reduced.

[0011]

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

Ultrasonic surgical instrument tip 10 according to the present invention
As shown in FIG. 1, a cylindrical portion 12 formed in an elongated cylindrical shape
A substantially conical wrench hook portion 20 is provided at the vibrator side end of the
The wrench hook 20 is provided with a thread groove 14 having a thread groove. It can be attached to and detached from the vibrator-side main body such as the transmission tube 34 via the screw groove 14. The wrench hook portion 20 is provided symmetrically with wrench grooves 22 and 23 into which a wrench used for attaching and detaching an ultrasonic surgical instrument tip is fitted. The ultrasonic surgical instrument tip is formed of, for example, titanium.

As shown in FIGS. 1 and 2, the wrench grooves 22 and 23 provided in the wrench hook portion 20 have concave portions as a whole, and have a horizontal plane 24 parallel to the vibration direction of the chip. The inclined surface 25 is formed of an inclined surface 25, a side wall surface 26, and a side wall curved surface 28 which are provided continuously with the groove 24. The inclined surface 25 which forms the bottom surface of the groove is provided to be inclined with respect to the vibration direction of the chip. Further, the side wall surface 26 is provided parallel to the vibration direction of the chip and perpendicular to the inclined surface 25,
The side wall curved surface 28 is formed as a concave curved surface. The wrench groove 23 disposed at a symmetrical position with respect to the wrench groove 22 has the same shape as the wrench groove 22.

In the wrench groove 22, since the inclined surface 25 forming the bottom surface is provided to be inclined with respect to the vibration direction of the chip, as shown in FIG. The area of the surface perpendicular to the surface can be reduced, and as shown in FIG. 3B, generation of bubbles due to cavitation in the perfusate can be suppressed. Further, since the side wall curved surface 28 is formed as a concave curved surface, the number of surfaces perpendicular to the vibration direction of the chip can be reduced, and the generation of bubbles due to cavitation can be further suppressed.

[0015]

As described above, according to the ultrasonic surgical instrument tip according to the present invention, the wrench groove has an inclined surface inclined with respect to the axial direction of the tip. The area of the surface perpendicular to the direction can be reduced, and the generation of bubbles due to cavitation in the perfusate can be suppressed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an ultrasonic surgical instrument tip according to the present invention, wherein (a) is a plan view and (b) is a front view.

FIG. 2 is an enlarged perspective view of an essential part of the ultrasonic surgical instrument tip according to the present invention.

3A and 3B are diagrams illustrating the shape and operation of an ultrasonic surgical instrument tip according to the present invention, wherein FIG.
(B) is a partial enlarged view in (a).

4A and 4B are diagrams illustrating the shape and operation of a conventional ultrasonic surgical instrument tip, wherein FIG. 4A is a cross-sectional view of the tip, and FIG. 4B is a partially enlarged view of FIG.

FIG. 5 is a cross-sectional view illustrating an example of a conventional ophthalmic surgical instrument.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ultrasonic surgical instrument tip 12 Cylindrical part 14 Screw groove part 20 Wrench hook part 22, 23 Wrench groove part 24 Horizontal plane 25 Inclined surface 26 Side wall surface 28 Side wall curved surface

Claims (1)

(57) [Claims] 1. An ultrasonic surgical instrument chip connected to a vibrator-side body for transmitting ultrasonic vibration of the vibrator and crushing a living tissue by ultrasonic vibration of a distal end portion, wherein the chip is attached to the vibrator-side main body. An ultrasonic surgical instrument tip, characterized in that a wrench groove into which a wrench fits for attachment / detachment has an inclined surface inclined with respect to the axial direction of the tip.