JPH0219151A - Cutter for operation - Google Patents

Abstract

PURPOSE:To surely cut a matter to be sucked by providing an opening to the head of an external cylinder in being close, sucking the matter in the vicinity of the head and cutting it. CONSTITUTION:An external member 12 has a planar surface 30 and a surface 31 to bent the planar surface, and an opening 18 is provided in a relation to the bent surface 31. A blade 33 of an internal cylinder 13 to open and close the opening 18 has an elastic surface 34 moved along the planar surface 30 and the surface 31 to bent the plane surface of the external member 12. By an air from an air pipe, a matter 4 to be sucked is sucked to the opening 18, and it is cut by the blade 33.

Description

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

Referring to FIG. 11, when operating this type of cutter 1, it is required that the opening 3 of the outer cylinder 2 be located closer to the tip of the outer cylinder 2. Ru. The reason for this is that eyeball 5
This is to ensure that the object 4 to be aspirated, such as the vitreous body, located near the tip of the outer cylinder 2 inside is reliably suctioned into the opening 3 and removed. This cutting is performed by reciprocating the inner cylinder 5 with respect to the opening 3.

In view of the above, U.S. Pat. No. 4,530,356 discloses a cutter as shown in FIG.

The outer vJ7 of the cutter 6 in FIG. This diagonal portion 8 is diagonal with respect to the axis of the cutter, so that the tip of the outer cylinder 7 can be brought as close as possible to the object 4 to be sucked.

However, the height position Y of the frontage 9 of the cutter 6 in FIG. 12 is substantially the same as the height position X of the frontage 9 of the cutter 3 in FIG. The distance at which it can approach the object 4 to be attracted is small.

1 to 11 An object of the present invention is to provide a surgical cutter in which a portion of the cutter can be brought close to the tip of an outer cylinder.

LL to 11 The invention is summarized in the claims.

1 for f/゛ Please refer to FIGS. 2-5.

The outer member (the outer cylinder 12 in the embodiment) has a flat surface 30 and a curved surface 31.
The above-mentioned frontage section 18 is provided in relation to the above. The part (blade 33 in the embodiment) of the inner member (inner cylinder 13 in the embodiment) that opens and closes the opening 18 is aligned along the flat surface 30 and the curved surface 11 of the outer member. It has a movable elastic surface (a flat surface 34 in the embodiment).

The opening 18 is provided closer to the tip of the outer cylinder 12,
The object to be aspirated 4 near the tip is suctioned and excised.

Support 11 Please refer to FIG.

[Surgical cutter] The surgical cutter 10 includes a main body 11, an outer cylinder 12, and an inner cylinder 1.
3, includes a rear member 14, a piston 15, a spring 16, and an air vibrator 17.

This cutter 10 is used to cut out objects to be aspirated within the eyeball.

[Outer Cylinder and Cylinder] The main body 11 is the part that is gripped by the technique. 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 pushed 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. A suction device including a vacuum pump etc. is connected to the rear end of the inner cylinder 13 via a suction tube 20.
It is connected to f21.

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 to 09 degrees. In other words, the initial position of the inner cylinder 13 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 drive device 23 including a compression pump etc. is connected through this hole 22a, air pipe 17 and air tube 22.
A compressed air pulse is sent to piston 15 while piston 1
5 can be moved forward (leftward in FIG. 1) against the force of a spring 16. 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 and 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. 0 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 2B is a sealing material that prevents compressed air pulses from leaking through the gap between the inner @ 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] The portion indicated by the dashed line in FIG. 1 is shown enlarged in FIG.

As shown in FIG. 2, the outer cylinder 12 has a flat surface 30 and a curved surface 31. The closed end of the outer cylinder 12 is bent into a U-shape. A frontage portion 18 is provided in relation to the curved portion 31. This embodiment preferably relates to both a curved shaft 31 and a flat shaft 30.

Please refer to FIGS. 3 and 4. The outer cylinder 12 has a square shape when viewed in a cross section perpendicular to the axial direction. The inner W113 is circular when viewed in an orthogonal cross section. A blade 33 is fixed to the tip of the inner cylinder 13 by welding or the like. This blade 33 is made of thin stainless steel or the like, has spring properties, and has a flat tip 34. As the inner cylinder 13 reciprocates, this shaft 34 slides along the flat surface 30 of the outer cylinder 12 and the inner surface of the curved angle surface 31. That is, in FIG. 3, the flat blade 34 of the blade 33 slides on the inner surface of the flat surface 30,
In FIG. 5, the flat surface 34 of the blade 33 is replaced by a curved surface 31.
It is sliding on the inner surface of.

[Operation 1] Next, referring to FIG. 6, a description will be given of how the object 4 to be aspirated inside the eyeball 5 is actually suctioned and resected.

The aspirated object 4 is on the retina 5a of the eyeball 5.

The tip of the outer cylinder 12 is inserted into the eyeball 5 and brought close to the fundus of the eye, so that the opening 18 corresponds to the object to be aspirated 4.

By operating the suction device 21 shown in FIG. 1, the suction target 4 shown in FIG.
is sucked into the opening 18. Then, the drive device 23 shown in FIG. 1 is operated to cause the piston 15 to reciprocate.

As a result, the inner cylinder 13 and the blade 33 shown in FIG.

The excised object to be aspirated 4 is sent to the suction device 21 via the inner tube 13 and the suction tube 20 shown in FIG.

In the cutter of the present invention shown in FIG. 6, the center position of the frontage part 18 and the height position Z to the fundus are different from the height position [X, Y] of each opening shown in FIGS. 11 and 12. (X > Y > Z).

For this reason, the opening 18 can be brought closer to the retina or fundus of the eye, and the object to be aspirated 4 near the retina can be reliably suctioned and excised. In other words, the object to be aspirated 4 near the tip of the outer cylinder 12 can be reliably removed.

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

The outer cylinder 12 does not have to have a hollow tetrahedral shape over its entire axial length as shown in FIG.

For example, as shown in FIG. 7, a cylindrical portion 40 may be formed from the main body side to an intermediate portion of the outer cylinder, and a portion near the tip of the outer cylinder may be a tetrahedral hollow portion 41.

The outer cylinder may have a flat portion 43 and a circular arc-shaped portion 44 when viewed in a cross section perpendicular to the axial direction, as shown in FIG.

The frontage of the outer cylinder may be triangular or polygonal in addition to being round.

The blade of the inner cylinder may be formed by flattening a portion of the inner cylinder 113 to form a blade 133 as shown in FIG.

The inner cylinder may be a polygonal hollow body in addition to a cylindrical body.

The open end of the outer cylinder may be substantially V-shaped instead of U-shaped.

J in FIG. 10: The cross section of the sea urchin outer cylinder may have only one flat portion and the rest may be arcuate.

The inner cylinder does not have to be partially hollow.

As explained above, according to the present invention, the object to be aspirated near the distal end of the outer cylinder can be reliably excised and a reliable surgery can be performed.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the surgical cutter of the present invention, Fig. 2 is a perspective view showing the vicinity of the tip of the outer cylinder, Fig. 3 is a sectional view of the vicinity of the tip, and Fig. 4 is A of Fig. 3. - A cross-sectional view of Alil, FIG. 5 is a cross-sectional view showing the state where the blade has passed through the frontage, FIG. 6 is a view showing the surgical cutter of the present invention being used, and FIGS. 7 to 10 are Diagrams showing other embodiments, 1st
1 and 12 are diagrams showing conventional examples. 12... Outer surface 13... Cylinder 18... Opening 30... Flat surface 31... Curved surface 33... Blade number Figure Figure Figure 11

Claims (1)

[Scope of Claims] An inner member is placed in a hollow outer member with one end closed, 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, In a surgical cutter that reciprocates the inner member relative to the outer member to cut an object sucked into an opening near one closed end of the outer member, the outer member is flat. The inner member has a flat surface and a curved surface, and an opening is provided in relation to the curved surface, and the portion of the inner member that opens and closes the opening is located on the flat surface of the outer member. A surgical cutter characterized by having an elastic surface that moves along a flat surface and a curved surface.