JPS62500570A - Surgical cutting device for ultrasonic eye surgery - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to an ultrasonic cutting device, and more particularly, to a method for cutting the anterior lens to facilitate eye surgery. It relates to a cutting needle configured to conform to the curvature of the surface of the capsule.

Description of prior art Ultrasonic cutting for performing detailed surgical procedures on the eye, such as capsulectomy surgery. When designing the cutting device, the shape of the device should be designed to cut the anterior lens smoothly and continuously. It is important to be able to do so. Also, make sure that the cutting device does not come into contact with the corneal endothelium. It is also a good idea to take measures to minimize damage to the inside of the eyeball. Ru. Also.

Preventing the formation of a chip behind the anterior lens during such procedures is also necessary.

Ultrasonic cutter configured for cataract removal procedures! One attempt to design a T device was As disclosed in U.S. Patent No. M3.589.363 of BarLLco . The device is a hand-held device with a surgical tip that vibrates at frequencies in the ultrasonic range. and various types, depending on the particular type of material or tissue to be excised or removed. It is designed to have a shaped cutting tip. However, the main axis of the cutting tool The entire structure is placed coaxially with the handle of the cutting tool, allowing it to accommodate the curvature of the anterior lens capsule surface. It is impossible to match.

Other cutting devices have been developed in the past; A device that satisfies the requirements of cutting off the anterior lens capsule and preventing the formation of a cut in the anterior lens capsule. location has not been developed.

Summary of the invention Therefore, the present invention has been made to satisfy the above-mentioned requirements, and the present invention has been made to satisfy the above-mentioned requirements. One of the key objectives is to cut the anterior lens capsule within, for example, a maximum ultrasound time of 20 seconds. An object of the present invention is to provide a surgical cutting needle configured to perform cutting procedures in a very short period of time. Ru.

Another object of the invention is that the Phragmatom (1'ral/matomg-registration) Trademark) When attached to an ultrasonic handheld device such as a handheld device, the section of the anterior lens capsule dangles. To provide a surgical cutting needle that evenly cuts through the anterior lens capsule so that no residue remains. It's there.

Yet another purpose is to easily cut the anterior capsular bag into shapes such as whole circles, squares, and triangles. An object of the present invention is to provide a surgical cutting needle that allows cutting.

Yet another object of the present invention is to form a hollow passageway therethrough with an irrigation fluid fc. to efficiently cool the cutting needle and its cutting tip by emitting air through the An object of the present invention is to provide a surgical cutting needle.

Yet another object of the invention is to maintain the striation or shape of the anterior chamber with irrigation fluid. The aim is to prevent the surgical cutting needle from coming into contact with the corneal endothelium.

Another purpose is to separate and remove the severed anterior lens I& from the eyeball after the end of the ultrasound. An object of the present invention is to provide a surgical cutting needle configured to.

According to the present invention, a sharp needle with a gentle curvature that conforms to the surface of the anterior lens capsule is used. By bending it in a special way, it can be used for the above purposes and other purposes. Target is violated. By bending in a special way and sharpening the tip. , it is easier to handle the needle during surgery, and the anterior lens capsule can be moved forward quickly and evenly. It becomes possible to cut the lens capsule without leaving any scraps. Eight holes provided at the tip of the needle Prevents heating of the tip and surrounds the tip by draining the irrigation fluid through the minimizes the cause of trauma to the surrounding tissue and allows the anterior chamber to be deeply penetrated during the cutting motion. can be maintained.

Brief description of the drawing The following detailed description will be better understood and explained when read in conjunction with the accompanying drawings. and other objects, features, and accompanying advantages of the present invention. be understood. In the drawings with Himetsu, the same reference numeral indicates similar or indicates the corresponding part.

Figure W, 1 is an elevational view showing the surgical needle attached to the support for observation.

Figure 2 is an enlarged elevational view of the needle tip, showing the upward cut surface adjacent to the fluid outlet. Showing details.

3 is a cross-sectional view of the needle tip taken along the line U+-US in FIG. 1; FIG.

FIG. 4 is a cross-sectional view of the needle tip taken along line IV--IV in FIG. 3.

FIG. 5 is an elevational view showing the surgical needle in operation, with the outline of the needle pointing to the anterior lens of the eye. It is shown that it corresponds to the outline of the sac.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The cutting device developed according to the present invention will be explained in conjunction with the drawings. Make it. First, referring to FIGS. 1 and 2, a main shaft portion 2 is formed in a hollow needle 1. This main shaft portion 2 is made of, for example, 23rd gauge tubular stainless steel, and its length is An internal passageway 3 is formed through the entire wall for the passage of irrigation and/or cooling fluid. ing.

As shown in Figure 5, irrigation fluid 8 is used to pressurize the eye during the cutting process. By maintaining the shape of the anterior chamber 5, in particular its depth, the needle 1 is placed inside the cornea of the anterior chamber 5. Avoid contact with skin. The fluid 8 flowing through the needle 1 is directed to the needle tip lO. It is also used for cooling, and is applied to the tissue surrounding the incision made using the sharp tip of the needle. In addition to minimizing the causes of external damage, heating of this tissue is also minimized.

The needle 1 is a needle support configured to be attached to the ultrasound source by, for example, a screw 11. It can be installed in the holding part 9. Forming a flat surface 13 on the needle support part 9 9 may be engaged with a tool for preventing rotation in a handheld item. hand The holder typically houses an ultrasonic generator to power the needle. needle 1, one of the important features is that the needle tip 1o and the needle stop shaft 2 are connected to the needle support 9. It is noted that the bent portion 15 is formed at a point that is approximately half the distance from the point 16 attached to the can be lost. The bent portion 15 can be bent within an angle A of approximately 10 to 75 degrees. It has been found that a 35 degree bend is preferred.

The distal portion 17 of the needle 1, extending from the bend 15 to the tip 10, extends along a surface 21. It is gently curved and matches the surface 19 of the anterior lens capsule 20 as shown in FIG. is configured to follow. The base 18 of the needle 1 extends from the bend 15 to the needle support 9. The top mounting extends up to the point. Just match the contour of the surface of the anterior lens capsule 20. causes the distal portion 17 to extend approximately an inch long and has a curvature A radius of approximately 1.0 to 1.5 inches has been found to be advantageous. in this way to minimize contact with the corneal endothelium and prevent damage to the corneal endothelium. Ring on surface 21 By making the contour into a gentle curve, it is possible to create a needle without a bent part 15 and a surface that draws a gentle curve. Compared to a needle without 21, it is possible to cut more evenly.

As shown in detail in FIGS. 2 and 3, the distal end 17 of the hollow needle stop shaft 2 has an upwardly facing Alternatively, a hook-shaped tip 10 is formed, which constitutes a saddle-shaped surface portion 23. There is.

The saddle-shaped portion 23 is cut with a radius of curvature R of approximately 0.010-0.020 inches. It is configured to hook and remove the cut anterior lens capsule after the lens has been placed. . For ease of manufacture, the hook-shaped tip 10 is made of solid material integral with the tubular material of the main shaft 2. Form. Each portion of the tip 25.27 is approximately 0.020-0.025 It is possible to create a radius with a chamfer radius of inch and 0.012 to o, ots inch. I know it's beneficial. The flat surface portion 29 has a radius at the exit point of the passage 3. For example, the diameter is between 0.010 and 0.040 inches. can extend the length of the chain.

Fourth [ff1K As shown more clearly, the concave surface between the flat surface portions 290 A surface 31 is formed. The concave surface 31 is located below or opposite the saddle surface 23. , as the needle tip 10 tapers toward its apex 33, the flat surface 29 It is formed so that the depth gradually decreases. Formed by the flat surface 29 and the cutting edge 35 It has been found that it is advantageous to bend the point 10 upward or in a hook shape at an angle B. ing. A suitable value for angle B is 60 degrees.

As shown in FIG. A surrounding chamfer radius 34 is given. As shown in FIG. 4, the vertex 33 is approximately 1 included within an angle C of 0 degrees to form a wedge-shaped tip between the tip sides 370. It is composed of Furthermore, the vertex 33 is also included within the angle E of approximately 15 degrees. and forms a double tapered tip. The pointed side surface 37 is angled away from the sharp cutting edge 35. It can be seen that the cutting edge 35 is tapered inward at C to form a chisel-shaped cutting edge. difference Furthermore, FIG. 3 also shows the apex 33 of the tip, with a sharp straight cutting edge 35 at the instep. Tapering towards vertex 33, it is contained within a 40 degree angle, or a trapezoid or A faceted surface forms a wedge-shaped apex and forms a compound angle along the apex 10. forming a surface.

Surfaces 29.35.37 can be formed by grinding.

The design of the cutting blade 35 allows it to cut the anterior lens capsule 20 cleanly, evenly, and quickly. It shall be as follows. The needle support part 9 is attached to an ultrasonic vibrator and the When the power is applied, the tip 10 cuts the anterior lens capsule 20 quickly and evenly. Can be done. By discharging the irrigation fluid 8 through the channel 3, the water heating of the tip is prevented. At the same time, the anterior chamber 5 can be pressurized to maintain a deep pressure during one operation.

By keeping the cutting tip 10 at a low temperature, damage to the anterior chamber 5 is prevented. . Most of the vibration of the main shaft portion 2 occurs at the bent portion 15. base 18 and The longitudinal movement of the distal end 17 relative to the support 9 is reduced by the formation of the bending angle A. As a result, the needle 1 cuts the anterior lens capsule 20 evenly by applying sufficient vibration accurately. It can be turned into an extremely sharp blade that can cut.

A gentle curve 21 formed at the distal end 17 of the needle 1 connects the anterior surface 1 of the anterior lens capsule 20. The dimensions should match 9. By creating a gentle curve like this, It becomes easier to cut the anterior lens capsule 20 smoothly and continuously, facilitating all cutting procedures. It will be done.

In this way, the bent part 15, the gently curved part 21, and the sharp tip part 10 The needle 1 has a button for easy handling during surgery, allowing you to quickly and easily remove the anterior lens capsule. It can be cut evenly and without leaving a piece of the anterior lens capsule. actual It has been found that the cutting time can be reduced to 20 seconds. Next, the electric power for ultrasonic cutting is After cutting the source, the anterior lens capsule is cut using a bent or hooked tip 10 hook and remove from the eye.

Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is. Therefore, it is understood that such changes and modifications are also within the scope of the claims. The present invention may be carried out in other ways than those specifically described above. It should be understood that this can be done.

FIG./.

international search report 1N+61゜l1lOnal Aaallellen N. PCT/lJs8 5102044

Claims (19)

[Claims] 1. a main shaft having a base and a distal end, the distal end forming a bending angle with the base; and, a cutting tip formed on the distal end. 2. Claim 1, wherein the end portion has an arcuate contour line corresponding to the surface to be cut. The device according to item 1. 3. The main shaft portion includes a hollow tubular shaft, and the main shaft portion includes a hollow tubular shaft for passing a fluid through the tubular shaft. 2. The device of claim 1, wherein a passageway is formed. 4. 2. The device of claim 1, wherein said tip comprises a wedge-shaped tip. 5. The device according to claim 1, wherein the pointed end has an arcuate saddle-shaped portion. . 6. 2. The apparatus of claim 1, wherein said bending angle comprises an angle of approximately 35[deg.]. 7. Claim 1, wherein the pointed end has at least one sharp cutting edge. equipment. 8. The at least one sharp cutting edge has a first sharp cutting edge and a second sharp cutting edge. The first and second sharp cutting edges taper toward the apex of the pointed end. 8. The apparatus according to claim 7. 9. Claim: The angle is formed approximately at a midpoint in the longitudinal direction of the main shaft portion. Apparatus according to paragraph 1. 10. The main shaft portion has a vertical axis, and the main shaft portion has a curved portion along the vertical axis. a surgical cutting device having a cutting tip formed thereon and having a cutting tip thereon; Place. 11. The curved portion corresponds to the arcuate surface contour of the anterior capsule of the lens of the eye. Apparatus according to scope 10. 12. The main shaft portion has a hollow tubular shaft, and the fluid is passed through the tubular shaft. 11. The device according to claim 10, wherein a passageway is formed. 13. The hollow shaft has an outlet adjacent the tip for discharging fluid from the hollow shaft. 13. The device of claim 12 forming a mouth. 14. Claims: The cutting tip comprises a first cutting edge portion and a second cutting edge portion. 10. Apparatus according to paragraph 10. 15. The first and second cutting edge portions taper toward the point to form a wedge-shaped point. 15. A device as claimed in claim 14, forming a section. 16. Claim wherein the tip has an arcuate saddle-shaped surface portion forming a wedge-shaped tip. The device according to scope 10. 17. The tip further comprises a concave surface portion opposite the saddle-shaped surface portion. 17. The apparatus according to claim 16. 18. The main shaft portion includes a hollow tubular shaft adjacent the tip portion forming an outlet. 18. The apparatus of claim 17, comprising: 19. The cutting tip and the main shaft are integrally formed from a tubular material. Apparatus according to claim 10.