JPH0274251A - Cutter for operation - Google Patents

Abstract

PURPOSE:To enhance the cutting quality by forming the opening part of an outer member and the cutting-off leading end part of an inner member at an angle becoming 0 deg.<alpha <180 deg.. CONSTITUTION:The leading end part 13a of an inner cylinder 13 is formed into a cutting blade part and a predetermined angle alpha is formed between this leading end part 13a and the cutting blade 18a of an opening part 18. This angle alpha is formed so as to become 0 deg.<alpha<180 deg.. Then, the inner cylinder 13 is reciprocally moved in the direction shown by an arrow to cut off the object to be sucked received in the opening part 18. The cut-off object to be sucked is sent to a suction device through the inner cylinder 13 and a suction tube. As mentioned above, the inner cylinder 13 is gradually meshed with the cutting blade 18a of the opening part 18 at the time of reciprocal movement in the direction shown by the arrow to cut the object to be sucked. Therefore, the press-cutting force of the object to be sucked is gradually applied along the cutting blade 18a and, as a result, the cutting quality to the object to be sucked is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) The present invention relates to a surgical cutter used to remove the vitreous body in surgeries such as vitrectomy.

Follow】Riyu Ni”L A surgical cutter has an outer cylinder and an inner cylinder.

The outer cylinder is inserted into the eyeball, an object to be aspirated, such as vitreous body, is sucked into an opening provided in the outer cylinder, and the object to be aspirated is removed by reciprocating the inner cylinder.

In this type of cutter, it is desirable to improve the cutting quality by defining the shape of the opening of the outer cylinder. This is because if the object to be aspirated cannot be reliably removed, damage may occur within the eyeball when the cutter is pulled out of the eyeball.

In a conventional surgical cutter, for example, a blade is provided at the opening of the outer cylinder, and the blade is oriented perpendicularly to the axial direction of the outer cylinder. The blades of the outer cylinder and the blades of the inner cylinder are made parallel.

In another conventional cutter, the blade portion of the outer cylinder is rounded.

In the former case, the object to be aspirated is pressed against the object all at once during cutting, so it does not cut easily and does not lead to improved cutting quality.

In the latter case, if the blade part of the outer cylinder has a rounded shape, the object to be sucked is pressed against it all at once, as described above.
It is difficult to cut and does not improve sharpness.

&"B Idan" Support This invention aims to provide a surgical cutter that can improve cutting quality.

11 sadness 11 The invention is summarized in the claims.

- to make i Please refer to FIGS. 2 and 3.

Closed opening 18 in the outer member (outer cylinder 12 in the example)
and the resection bevel 'IN a of the internal material (inner cylinder 13 in the example)
313a is formed at an angle such that O''<α<180.

Preferably, the portion (cutting edge 18a) of the opening 18 of the external member that becomes the blade is Q'<β≦ with respect to the axial direction of the external member.
It is formed at an angle of 90°. Preferably, the tip portion 13a, which becomes the blade of the internal member, is formed at an angle of 0゛<γ≦90° with respect to the axial direction of the internal member.

[The object to be sucked is not pressed all at once, but is gradually cut off.

Tip 1” LL Please refer to FIG.

[Surgical Cutter] The surgical cutter 10 includes a main body 11, an outer cylinder 12 as an external member, an inner cylinder 13 as an internal member, a rear member 14, a piston 15, a spring 16, and an air pipe 17. This cutter 10 is used to cut out objects to be aspirated within 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 remaining portion of the inner cylinder 13 passes through the piston 15 and the rear member 14. The inner cylinder 13 is fixed to the piston 15 but not to the rear member 14. The rear end of the inner cylinder 13 is connected via a suction tube 20 to a suction device 21 including a vacuum pump or the like.

The rear member 14 is screwed onto the main body 11, and by adjusting the rear member 14, the position of the piston 15 can be adjusted. In other words, the initial position of the inner cylinder can be adjusted.

A hole 22a is formed in the rear member 14.

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 through this hole 22a, the air pipe 17, and the air tube 22, and the piston 15 can move forward (leftward in FIG. 1) against the force of the spring 16. It is now possible to do so. 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 16 is arranged between the O-ring retainer 24 and the piston 15.

The O-ring presser 24 holds down the O-ring 25. An O-ring 26 is arranged between the piston 15 and the main body 11. O-rings 27, 28 are provided between the rear member 14 and the main body 11 and between the rear member 14 and the piston 15, respectively.

The O-ring 26 is a sealing material that prevents compressed air pulses from entering the chamber where the spring 16 is located. 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 28 is a sealing material that prevents compressed air pulses from leaking through the gap between the inner cylinder 13 and the rear member 14. 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.

[Near the tip of the outer cylinder] FIG. 2 shows an enlarged view of the portion indicated by the dashed line in FIG. 1 as viewed in the direction of arrow X.

The opening 18 of the outer cylinder 12 in FIG. 2 is formed to be inclined at a predetermined angle β with respect to the axial direction of the outer cylinder 12. This β is 45° in Example 1.

The tip 13a of the inner cylinder 13 is a cutting edge, and the tip 13a and the cutting edge 18a of the opening form a predetermined angle α. This angle α is 45° in the first embodiment.

Further, the cutting edge 13a of the inner cylinder 13 forms a predetermined angle γ in the axial direction of the inner cylinder 13. This angle γ is 90° in Example 1.
It is.

[Operation 1] Next, referring to FIGS. 1 to 3, a description will be given of how the object to be aspirated 4 in the eyeball is actually suctioned and resected.

The suction device 21 shown in FIG. 1 is operated to remove the suction target 4 shown in FIG.
is sucked into the opening 18. And the drive device 2 in FIG.
3 to cause the piston 15 to reciprocate.

As a result, the inner cylinder 13 shown in FIG. 2 is reciprocated in the direction of the arrow, and the object to be aspirated that has entered the opening 18 is removed. The excised object to be aspirated is sent to the suction device 21 via the inner cylinder 13 and suction tube 20 shown in FIG.

In this way, when reciprocating in the direction of the arrow in Fig. 2, the inner cylinder 1
3 gradually engages with the cutting blade 18a of the opening 18 to illuminate the object to be sucked. For this reason, the force to push the object to be sucked is transferred to the cutting blade 18.
The cutting force is applied gradually along the cutting blade 18a instead of being applied to the entire length of the cutting blade 18a at once, so that the object to be sucked can be cut better.

Support See Figure 3.

In the second embodiment, the cutting edge 118a of the opening 118 of the outer cylinder 112
The angle β is 60°. The angle α formed by the tip 113a, which is the cutting edge of the inner cylinder 113, and the cutting edge 118a of the frontage 118
is 60'. The tip 113a which is the cutting edge is the inner cylinder 11
The angle γ formed in the axial direction of No. 3 is also 60°.

In the second embodiment, the length of the cutting edge 118a and the tip portion 113a can be increased, and the cutting quality is further improved.

Friend 111 Please refer to FIG.

In the third embodiment, the cutting edge 218 of the opening 218 of the outer cylinder 212
The angle β is 90'. The angle α formed by the tip 213a, which is the cutting edge of the inner cylinder 213, and the cutting edge 218a of the opening 218
is 30°. The tip 213a, which is a cutting edge, is connected to the inner cylinder 21.
The angle γ formed in the axial direction of No. 3 is 60'.

In Example 3, the tip portion 213a can be made longer and the cutting quality is improved.

However, the present invention is not limited to the above-described embodiments.

The angle α can be arbitrarily set between 0°<α<180°.

The angle β can be arbitrarily set within the range 0≦90°. The angle γ can be arbitrarily set within 0<γ≦90°.

11 As explained above, according to claim 1, since the object to be sucked is gradually cut off from the edge, an effect similar to that of cutting fibrous material with a kitchen knife is produced, and the quality of taste is improved. .

Compared to the case where the opening and the tip of the internal member are provided in parallel, the length of the cutting blade can be made longer, which is more effective, and the life of the blade can also be extended.

According to the second aspect of the present invention, the angle and length of the portion that becomes the blade of the opening in the external member of limited size can be freely set as necessary, and the cutting quality can be improved.

According to claim 3, the angle and length of the portion of the internal material that becomes the blade can be freely set as necessary for the internal material of limited size, and the cutting quality can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of a surgical cutter according to the present invention, and FIGS. 2 to 4 are views showing embodiments 1 to 3 of the tip portion of a surgical cutter according to the present invention. 12...Outer tube 13...Inner tube 13a...Tip 18...Opening 18a... ...cutting blade

Claims (3)

[Claims] 1. The inner member is placed in a hollow outer member that is closed at one end, and a movable body is provided in the main body of the cutter.The inner member is attached to the movable body and the movable body is reciprocated by a reciprocating means, and the inner member is moved into the cutter body. In a surgical cutter that reciprocates with respect to the external member to cut an aspirated object sucked into the opening on the side surface of the external member using the tip of the internal member, the opening of the external member and A surgical cutter characterized in that the cutting tip of the internal member is formed at an angle such that 0°<α<180°. 2. The surgical surgical device according to claim 1, wherein a portion of the opening of the external member that becomes a blade is formed at an angle of 0°<β≦90° with respect to the axial direction of the external member. cutter. 3. The surgical cutter according to claim 1, wherein the portion of the internal member that becomes the blade is formed at an angle of 0°<γ≦90° with respect to the axial direction of the internal member.