JPH03133449A - Cutter for ophthalmic operation device - Google Patents

Abstract

PURPOSE:To surely cut stuff to be sucked by generating the entanglement of an inner cylinder with an outer cylinder at three points by forming the inner cylinder with a seamless cylinder, and forming the outer cylinder by making a thin plate round into cylindrical shape. CONSTITUTION:The inner cylinder 13 is formed in a seamless capillary by cutting or another method. Therefore, no joint is generated in the cylinder. The outer cylinder 12 is formed cylindrically by making round the thin plate, and an aperture part 18 for cutting is provided at a side opposite to the joint 40. The thin plate is formed generally in triangular shape by making round, however, when the inner cylinder 13 with round cross-section is inserted to the outer cylinder 12, it comes in contact with the outer cylinder at the three points P1, P2, P3 in total in the neighborhood of the joint 40 of the outer cylinder 12 and a central part. Therefore, it is possible to perform cutting satisfactorily with a cutter of such structure by always bringing the inner cylinder 13 into contact with the outer cylinder 12 at a cutting part. An operation is performed by operating a sucking device 21, and sucking the stuff 30 to be sucked in an eye-ball to the aperture part 18, and reciprocating a piston 15 by moving a driving device 23 differentially, and cutting the stuff 30 in the aperture part 18.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a cutter for an ophthalmic surgical device for cutting an object to be removed in ophthalmic surgery, such as vitreous surgery.

2. Description of the Related Art As shown in FIG. 4, a conventional cutter for an ophthalmic surgical device consists of an outer cylinder 2 with an open window 1 and an inner cylinder 3 that is in close contact with the outer cylinder 2. By moving this inner cylinder 3 in the axial direction,
The window 1 of the outer tube 2 and the tip 4 of the inner tube 3 are used to cut out an object 5 that has entered the window 1.

Problems to be Solved by the Invention However, in order to cut out the object to be cut 5, the outer tube 2 and the inner tube 3 must fit tightly together.

It is very difficult to manufacture the outer cylinder 2 and the inner cylinder 3 so that they are in complete contact with each other.

In many cases, the outer cylinder 2 is manufactured into a seamless cylindrical shape by cutting. On the other hand, the inner cylinder 3 is a thin plate rolled up so as to be inscribed in the outer cylinder 2, and has a seam 6. In order to bring them into close contact with each other with some spring effect, it is common practice to manufacture the inner cylinder 3 with an outer diameter slightly larger than the inner diameter of the outer cylinder 2. In this case, the seam 6 of the inner tube 3 is on the opposite side of the window 1 of the outer tube 2.

However, for example, if the plate thickness is 0.03 mm and the outer diameter of the cylinder is 1.5 m,
When making the inner cylinder 3 with a length of about 35++ m by rolling a plate, it is difficult to make it perfectly circular. Generally, as shown in FIG. 5, parts R near both ends of the plate contact the outer cylinder 2, and often do not come into contact with the cutting window 1 of the outer cylinder 2 of the liver and kidneys.

In order to avoid this problem, the diameter of the inner cylinder 3 is made slightly smaller than the inner diameter of the outer cylinder 2 as shown in Fig. 6, and the inner cylinder 3 is pressed against the shaft passing through the center of the window 1 of the outer cylinder 2. It has also been considered that the inner tube 3 and the outer tube 2 are brought into contact only at the pressed portion Q of the inner tube 3 and the outer tube 2.

However, in this case, the pressed part Q of the inner cylinder 3 and outer cylinder 2
It can be cut in some areas, but since there is no contact in other parts, it is virtually impossible to cut at all.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a cutter for an ophthalmic surgical device that eliminates the above-mentioned disadvantages and has a good cutting effect.

SUMMARY OF THE INVENTION The gist of the present invention is a cutter for an ophthalmic surgical device as set forth in the claims.

Means to solve problems See Figure 2.

The outer cylinder 12 as an external member has an opening 18 on the side near the tip. The inner cylinder 13 as a hollow internal member inserted into the outer cylinder 12 cuts off the object 30 sucked into the opening 18 by moving the outer cylinder 12 relatively.

The inner cylinder 13 is formed from a seamless cylinder.

The outer cylinder 12 is formed by rolling a thin plate into a cylindrical shape.

In Figure 2, the engagement of the inner cylinder 13 and outer cylinder 12 is shown at three points P.
``'''' P 3 is easy to generate, and the object to be aspirated 30 can be resected reliably.

Example Please refer to FIG.

[Surgical cutter] The surgical cutter 10 includes a main body 11, an outer cylinder 12, and an inner cylinder 13.
, a rear member 14, a piston 15, a spring 16, an air pipe 17, etc. The outer cylinder 12 of this cutter 10 is inserted into the eyeball to cut out the object to be aspirated 30 inside the eyeball.

[Outer Cylinder and Inner Cylinder] The main body 11 is the part that is held by the operator. The main body 11 has an outer cylinder 1
The rear end of 2 is fixed. An opening 18 is formed at the closed end of the outer cylinder 12.

A portion of the inner cylinder 13 is inserted into the outer cylinder 12. The outer cylinder 12 and the inner cylinder 13 are made of steel. The remaining portion of the inner cylinder 13 passes through the piston 15 and the rear member 14. Inner cylinder 1
3 is fixed to the piston 15, but is not identified to the rear member 14. The rear end of the inner cylinder 13 is connected to the suction tube 2
0 to a suction device 21 including a vacuum pump or the like.

The rear member 14 is screwed to the main body 11 via a presser ring 11a. Adjustment screw 14 attached to rear member 14
The position of the stopper 28 can be changed with a, and the position of the piston 15 can be adjusted. In other words, the initial position of the inner cylinder 13 can be adjusted. The stroke of the inner cylinder 13 can also be changed.

The spring 16 pushes the piston 15 toward the rear member 14. A compressed air pulse is sent from the drive device 23 to the piston 15 via the air pipe 17 and the air tube 22, so that the piston 15 can move forward (leftward in FIG. 1) against the force of the spring 16. ing. When the compressed air pulse is removed, the force of the spring 16 causes the piston to return to its initial position. In this way, the piston 15 and the inner cylinder 13 reciprocate. This spring 1
6 is arranged between the O-ring retainer 24 and the piston 15.

The O-ring presser 24 holds down the O-ring 25. A diaphragm 26 is arranged between the piston 15 and the main body 11. The stopper 28 is provided with an O-ring 27 between the rear member 14 and the main body 11 and between the rear member 14 and the piston 15.

The diaphragm 26 is a sealing material that prevents compressed air pulses from entering the chamber where the spring 16 is located. The O-ring 25 is a sealing material that prevents the air in the room where the spring 16 is located from flowing into the outer cylinder 12. The O-ring 27 is a sealing material that prevents compressed air pulses from escaping through the gap between the main body 11 and the rear member 14.

FIG. 2 shows an enlarged view of the inner cylinder 13 and the outer cylinder 12.

The inner cylinder 13 is made into a seamless thin tube by cutting or other methods. In other words, there is no seam.

The outer cylinder 12 is made as shown in FIG. That is, the outer cylinder 12 is made into a cylindrical shape by rolling a thin plate. The outer cylinder 12 has a seam 40. An opening 18 for cutting is made on the side opposite to the seam 40.

Generally, when a thin plate is rolled, it cannot be made into a perfect circle, but it is usually formed into the shape of a rice ball, for example, as shown in Figure 2. The outer cylinder 12 has such a ball shape and the inner cylinder 1 has a perfect circular cross section.
3, the seam 40 of the outer cylinder 12 as shown in Figure 2.
There will be contact at a total of three locations P1 to P3, near the area and near the center. Therefore, in a cutter having such a structure, the inner tube 13 and the outer tube 12 are always in contact with each other at the cutting portion, and good cutting can be expected.

[Operation] Next, referring to FIG. 1, a description will be given of how the object to be aspirated 30 inside the eyeball is actually suctioned and removed.

The suction device 21 is operated to suck the object 30 into the opening 18 . Then, actuate the drive device 23 to drive the piston 1.
5 to reciprocate.

As a result, the object to be sucked 30 located in the opening 18 is removed. The excised object to be aspirated 30 is sent to the suction device 21 via the inner tube 13 and the suction tube 20.

In another embodiment shown in FIG.
This prevents it from getting caught in the parts. Alternatively, it prevents the outer tube 12 from getting caught in the cut of the eyeball when it is inserted into and removed from the eyeball. The outer skin may be made of plastic instead of metal. Alternatively, a film may be formed by applying silicone or other liquid synthetic resin.

Effects of the Invention - From what has been explained, the object to be aspirated can be reliably excised by the internal and external materials. Therefore, the efficiency and safety of ophthalmic surgery can be improved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a cutter for an ophthalmic surgical device according to the present invention, FIG. 2 is a cross-sectional view showing the engagement of the outer cylinder and the inner cylinder, FIG. 3 is a cross-sectional view showing another embodiment, and FIGS. FIG. 6 is a diagram showing a conventional example. 12・・・・・・Outer tube 13・・・・・・Inner tube 40・・・・・・ Seam 60・・・Outer skin FIG 2 FIG.3

Claims (1)

[Claims] It has a hollow outer member having an opening on the side near the tip, and a hollow inner member inserted into the outer member, and the inner member and the outer member can be moved relative to each other. An ophthalmic surgical device for a surgical cutter for cutting an aspirated object sucked into an opening, wherein the inner member is formed from a seamless cylinder, and the outer member is formed by rolling a thin plate into a cylindrical shape. Cutter.