JP2750701B2 - Surgical cutter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surgical cutter used for cutting off the vitreous body or the like in surgery such as vitreous surgery.

2. Prior Art Referring to FIG. 11, in order to operate this kind of cutter 1, it is required that the position of the opening 3 of the outer cylinder 2 be closer to the tip of the outer cylinder 2. This is because the eyeball 5
This is because the object to be aspirated 4 such as the vitreous body located near the tip of the outer cylinder 2 is reliably sucked into the opening 3 and cut off. This resection 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 the cutter of FIG.

The outer cylinder 7 of the cutter 6 shown in FIG. The oblique portion 8 is also oblique with respect to the axis of the cutter, so that the tip of the outer cylinder 7 can approach the object 4 to be sucked even a little.

However, the height position Y of the opening 9 of the cutter 6 in FIG. 12 is substantially the same as the height position X of the opening 3 of the cutter 3 in FIG. The distance in which the object 9 can be brought close to the object 4 is small.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a surgical cutter capable of approaching an opening near the tip of an outer cylinder.

SUMMARY OF THE INVENTION The present invention provides an inner member in a hollow outer member having one end closed and a movable body provided in a main body of a cutter. The inner member is attached to the movable body, and the movable body is reciprocated by reciprocating means. A surgical cutter for reciprocating the inner member with respect to the outer member to cut off an object to be suctioned into an opening near a closed end of the outer member, wherein the outer member is A surgical cutter, wherein an opening is provided, and the inner member that opens and closes the opening has an elastic surface that moves along a curved surface of the outer member. .

Means for Solving the Problems Reference is made to FIG. 2 to FIG.

The outer member (in the embodiment, the outer cylinder 12) has a flat surface 30 and a flat surface curved surface 31, and the opening 18 is provided in relation to the curved surface 31. The portion (the blade 33 in the embodiment) of the inner member (in the embodiment, the inner cylinder 13) that opens and closes the opening 18 extends along the flat surface 30 and the flat surface 31 of the outer member. It has a moving resilient surface (a flat surface 34 in the embodiment).

The opening 18 is provided closer to the tip of the outer cylinder 12, and the suction object 4 near the tip is sucked and cut off.

EXAMPLE Referring to FIG.

[Surgical Cutter] The surgical cutter 10 includes a main body 11, an outer cylinder 12, an inner cylinder 13, a rear member 14, a piston 15, a spring 16, and an air pipe 17. The cutter 10 cuts an object to be sucked in the eyeball.

[Outer Cylinder and Inner Cylinder] The main body 11 is a part that the operator holds. The rear end of the outer cylinder 12 is fixed to the main body 11. An opening 18 is formed on the closed distal end side of the outer cylinder 12.

A part of the inner cylinder 13 is inserted into the outer cylinder 12. Inner cylinder 13
Pass through the piston 15 and the rear member 14. The inner cylinder 13 is fixed to the piston 15, but is not fixed 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 and the like.

The rear member 14 is screwed to the main body 11, and this rear member
By adjusting 14, the position of the piston 15 can be adjusted.
That is, the initial position of the inner cylinder 13 can be adjusted.

A hole 22a is formed in the rear member 14. Spring 16
Pushes the piston 15 toward the rear member 14. A compressed air pulse is sent from the driving device 23 including a compression pump to the piston 15 through the hole 22a, the air pipe 17 and the air tube 22, and the piston 15 is moved forward against the force of the spring 16 (FIG. 1, left). Direction) can be moved. When the compressed air pulse disappears, the force of the spring 16 returns the piston to the initial position. In this way, the piston 15 and the inner cylinder 13 reciprocate. The spring 16 is disposed between the O-ring presser 24 and the piston 15.

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

The O-ring 26 is a sealing material for preventing the compressed air pulse from entering the room where the spring 16 is located. The O-ring 25 is a sealing material for preventing indoor air having the spring 16 from flowing into the outer cylinder 12. The O-ring 28 is a sealing material for preventing compressed air pulses from being received from the gap between the inner cylinder 13 and the rear member 14. O-ring 27 applies compressed air pulse to main body 11 and rear member
It is a sealing material to keep from 14 gaps.

[Near the tip of the outer cylinder] FIG. 2 is an enlarged view of a portion shown by a dashed line in FIG.

As shown in FIG. 2, the outer cylinder 12 has a flat surface 30 and a flat surface 31 that is curved. The closed end of the outer cylinder 12 is bent into a U-shape. An opening 18 is provided in connection with the curved surface 31. This embodiment preferably involves both a curved surface 31 and a flat surface 30.

Please refer to FIG. 3 and FIG. The outer cylinder 12 has a square shape when viewed in a cross section orthogonal to the axial direction. The inner cylinder 13 has a circular shape when viewed in a cross section orthogonal to it. A blade 33 is fixed to the tip of the inner cylinder 13 by welding or the like. The blade 33 is made of thin stainless steel or the like, has a spring property, and has a flat surface 34.
With the reciprocation of the inner cylinder 13, this surface 34 becomes the flat surface 30 of the outer cylinder 12.
It slides along the inner surface of the curved surface 31. That is, in FIG. 3, the flat surface 34 of the blade 33 slides on the inner surface of the flat surface 30, and in FIG. 5, the flat surface 34 of the blade 33 slides on the inner surface of the curved surface 31. I have.

[Operation] Next, with reference to FIG. 6, the manner in which the object 4 in the eyeball 5 is actually suction-excised will be described.

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

The distal end of the outer cylinder 12 is inserted into the eyeball 5 to approach the fundus so that the opening 18 corresponds to the object 4 to be aspirated.

The suction device 21 shown in FIG.
Is sucked into the opening 18. Then, the driving device 23 shown in FIG.
Is operated to reciprocate the piston 15.

Thereby, the inner cylinder 13 and the blade 33 shown in FIG. The cut object 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 opening 18 and the height position Z to the fundus are compared with the height positions X and Y of each opening shown in FIG. 11 and FIG. It can be quite small (X>Y> Z).

For this reason, the opening 18 can be brought closer to the retina or the fundus, and the suction target 4 in the vicinity of the retina can be reliably sucked and excised. In other words, the suction target 4 near the tip of the outer cylinder 12 can be reliably cut off.

 The invention is not limited to the above-described embodiment.

As shown in FIG. 1, it is not necessary to form a tetrahedral hollow over the entire length of the outer cylinder 12 in the axial direction. For example, as shown in FIG. 7, a cylindrical portion 40 may be formed from the main body side to a middle portion of the outer cylinder, and a portion close to the tip of the outer cylinder may be formed as a tetrahedral hollow portion 41.

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

The opening of the outer cylinder may be triangular or polygonal in addition to a round shape.

As for the blade of the inner cylinder, a part of the inner cylinder 113 may be flattened as the blade 133 as shown in FIG.

 The inner cylinder may be a polygonal hollow body other than the cylindrical body.

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

As shown in FIG. 10, the cross section of the outer cylinder may have only one flat portion and may be arcuate.

 The inner cylinder does not have to be partially hollow.

Effect of the Invention As described above, according to the present invention, an object to be aspirated near the distal end of the outer cylinder can be reliably cut off, and a reliable operation can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a surgical cutter of the present invention, FIG. 2 is a perspective view showing the vicinity of a distal end of an outer cylinder, FIG. 3 is a sectional view showing the vicinity of the distal end, and FIG. FIG. 5 is a cross-sectional view taken along the line A, FIG. 5 is a cross-sectional view showing a state where the blade has passed through the opening, FIG. 6 is a view using the surgical cutter of the present invention, FIG. 7 to FIG. FIG. 11 is a view showing another embodiment, and FIGS. 11 and 12 are views showing a conventional example. 12 ... outer cylinder 13 ... cylinder 18 ... opening 30 ... flat surface 31 ... curved surface 33 ... blade

Claims (1)

(57) [Claims] An internal member is inserted into a hollow outer member having one end closed, and a movable body is provided on a main body of a cutter. The inner member is attached to the movable body, and the movable body is reciprocated by reciprocating means. A surgical cutter for reciprocating an inner member with respect to the outer member to cut off an object to be sucked sucked into an opening near a closed end of the outer member, wherein the outer member has an opening Wherein the inner member for opening and closing the opening has an elastic surface that moves along a curved surface of the outer member.