JP2023058656A - forceps - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forceps that can properly transmit the feeling of grabbing an object. from a clamping part to a user.

SOLUTION: A forceps 1 includes: a sheath 2 provided with a clamping portion 6 at a distal end 21; a distal-side front handle 4 for supporting a proximal end 22 of the sheath 2; a proximal-side rear handle 5 connected to the front handle 4 rotatably with respect to the front handle 4; and a shaft 3 having one end 31 inserted into the hollow portion of the sheath 2 and connected to the clamping portion 6 and another end 32 connected to the rear handle 5, the shaft being configured to move longitudinally in response to the rotation of the rear handle 5 to open and close the clamping portion 6. The front handle 4 and the rear handle 5 are made of resin.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to forceps for grasping and cutting living tissue in endoscopic surgery.

In recent years, in surgical operations, minimally invasive endoscopic surgery has been performed in place of conventional open surgery. Endoscopic surgery is performed by making multiple small holes in the abdominal wall, inserting an endoscope into the abdominal cavity, and using forceps, an electric scalpel, etc. while observing images inside the abdominal cavity on a monitor television. Since endoscopic surgery does not require laparotomy, it has the advantage of less burden on the patient and quicker postoperative recovery.

Patent Literature 1 discloses general forceps used in endoscopic surgery. This forceps has an elongated insertion section to be inserted into the abdominal cavity and a pair of handles to be gripped and operated by the user. The distal end of the insertion section is provided with a clamping section that opens and closes to grasp and cut living tissue. A user can open and close the holding portion by operating the pair of handle portions. With this forceps, when the pair of handles are closed until they are in contact with each other, the clamping portion is closed and the living tissue can be grasped.

Patent No. 2504936

By the way, in endoscopic surgery, all surgical instruments are expensive instruments that are intended to be reused. It is necessary to make it disposable and lower the hurdles for introduction. Further, in endoscopic surgery, when a user grips an object such as a living tissue with forceps, it is preferable that the user can appropriately feel the feeling of gripping the object. However, the forceps having the elongated insertion portion has a problem that the feeling of gripping the object is not properly transmitted from the clamping portion to the user through the pair of handle portions.

Accordingly, an object of the present invention is to provide forceps capable of appropriately transmitting the feel of gripping an object from a gripping portion to a user.

According to one aspect of the invention,
a sheath having a distal end and a proximal end, a hollow portion, and a clamping portion provided at the distal end for opening and closing to grasp an object;
a distal front handle supporting the proximal end of the sheath; and a proximal rear handle rotatably coupled to the front handle relative to the front handle;
It is inserted into the hollow portion of the sheath, has a longitudinal direction, has one end connected to the clamping portion and the other end connected to the rear handle, and moves in the longitudinal direction in response to rotation of the rear handle. a shaft configured to open and close the clamping portion by
A forceps is provided wherein the front handle and the rear handle are made of resin.

Further, between the front handle and the rear handle, when the rear handle is rotated in the direction of approaching the front handle until the clamping portion is closed, the front handle moves toward the rear handle. provided with a stopper configured to restrict further rotation;
Forceps are provided.

According to one aspect of the present invention, if the front handle and the rear handle, which account for most of the weight of the forceps, are made of resin, the weight of the forceps can be reduced and the forceps can be made disposable.

Further, when the rear handle is rotated in a direction approaching the front handle until the clamping portion is closed, further rotation of the front handle in a direction approaching the rear handle is restricted by the stopper. At this time, the greater the distance from the portion of the front handle and the rear handle that the user grips and operates (such as a finger ring) to the stopper, the bending moment that the user applies to the pair of handles with the stopper as the fulcrum and the portion gripped by the user as the force point. increases and the pair of handles flex accordingly. Through this bending, the user can get a feeling that the gripping portion reliably grips the object.

1 is a perspective view showing forceps according to an embodiment of the present invention; FIG. 1 is a side view showing forceps according to an embodiment of the present invention; FIG. 1 is a plan view showing forceps according to an embodiment of the present invention; FIG. FIG. 4 is a plan view showing a clamping portion of the forceps according to the embodiment of the present invention; FIG. 5 is a cross-sectional view of FIG. 4 cut along line AA and viewed in the direction of the arrow; FIG. 4 is an assembly drawing of a pair of handles; FIG. 3 is a side view corresponding to FIG. 2 showing the forceps with the clamping portion closed; FIG. 5 is a plan view showing forceps according to another embodiment of the present invention; FIG. 9 is a cross-sectional view of FIG. 8 cut along line BB and viewed in the direction of the arrow; Fig. 10 is a side view showing forceps according to yet another embodiment of the present invention; Fig. 10 is a side view showing forceps according to yet another embodiment of the present invention; FIG. 12 is a partially enlarged view of the forceps shown in FIG. 11; FIG. 4 is a partially enlarged view of the forceps before bending the bending portion; Fig. 10 is a side view showing forceps according to yet another embodiment of the present invention; 15 is a partial enlarged view of the forceps shown in FIG. 14; FIG. FIG. 4 is a partial enlarged view of the side surface of the forceps before bending the bending portion; FIG. 4 is a partially enlarged plan view of the forceps before bending the bending portion; It is (a) a plan view and (b) a cross-sectional view showing a modification of the shaft used in the forceps according to the embodiment of the present invention. FIG. 11 is a side view photograph showing forceps according to yet another embodiment of the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the embodiments, terms indicating directions such as front, back, left, right, up, and down may be used, but these terms are used merely to facilitate understanding of the description. Therefore, these terms should not be construed as limiting the invention.

FIG. 1 is a perspective view showing forceps 1 according to an embodiment of the present invention, and FIG. 2 is a side view showing forceps 1. FIG. The forceps 1 are used for grasping and cutting living tissue in endoscopic surgery. For example, the forceps 1 can be used to grasp or cut a hernia in a percutaneous endoscopic disc herniation (PED) performed using a percutaneous endoscope system. It may be used for extraction. The forceps 1 is assumed to be used as a disposable product, but the present invention is not limited to this.

A forceps 1 comprises a sheath 2, a shaft 3 and a pair of handles 4,5. The sheath 2 is an insertion section that is inserted into a body cavity (for example, an abdominal cavity). A pair of handles 4 and 5 are portions that are gripped and operated by the user.

[Sheath 2]
The sheath 2 has an elongated cylindrical shape. Hereinafter, in the elongated sheath 2, the side that is first inserted into the body cavity is the distal side (or front side), and the side that is opposite to the distal side and is provided with the pair of handles 4 and 5 is the proximal side. (or posterior side). This is the same for other parts of the forceps 1 as well. Of the two directions perpendicular to the front-rear direction defined in this way, the direction perpendicular to the paper surface in the side view shown in FIG. 2 is called the left-right direction, and the direction perpendicular to the paper surface in the plan view shown in FIG. referred to as the vertical direction. The front-rear direction of the sheath 2 may be referred to as the longitudinal direction. Assume that FIG. 2 is a side view of the forceps 1 viewed from the left side.

In this embodiment, the sheath 2 extends linearly along a longitudinally extending central axis 101 . Sheath 2 has a distal end 21 and a proximal end 22 . It should be understood that the term "distal end" and "proximal end" hereinafter refers not only to the end point but also to the region including the end point and its neighboring region. The sheath 2 has a hollow portion 23 that extends in the front-rear direction and penetrates the sheath 2 .

FIG. 4 is a plan view showing the clamping portion 6 of the forceps 1, and FIG. 5 is a cross-sectional view of FIG. 4 cut along line AA and viewed in the direction of the arrow. The clamping portion 6 is provided at the distal end 21 of the sheath 2 . The holding portion 6 has a function of opening and closing to hold an object.

The holding portion 6 has a lower holding piece 61 and an upper holding piece 62 . In this embodiment, the lower clamping piece 61 is provided integrally with the sheath 2 and does not swing with respect to the sheath 2 . The upper clamping piece 62 is provided with two holes extending in the horizontal direction, the pin 63 is loosely fitted in the upper hole, and the pin 64 is loosely fitted in the lower hole. The upper pin 63 is fixed to the sheath 2 and the pin 64 is fixed to the front end of the link 65 . A pin 66 is fixed to the rear end of the link 65 . A shaft receiving portion 67 is arranged in the hollow portion 23 of the sheath 2 . The shaft receiving portion 67 has a groove that opens to the proximal side (rear side), and receives the shaft 3 in this groove. A hole extending in the left-right direction is provided at the front end of the shaft receiving portion 67, and a pin 66 is loosely fitted in this hole. As a result, first, the upper clamping piece 62 can swing with respect to the sheath 2 with the pin 63 as the rotation axis. Further, the link 65 can swing with respect to the upper clamping piece 62 and the shaft receiving portion 67 with the pins 64 and 66 as rotation axes.

When the shaft receiving portion 67 is moved proximally (rearward) via the shaft 3, the link 65 converts the linear motion of the shaft receiving portion 67 into rotational motion of the upper clamping piece 62, and the upper clamping piece 62 moves downward. The clamping portion 6 is closed by rotating toward the clamping piece 61 (counterclockwise in FIG. 2).

In another embodiment, both the lower clamping piece 61 and the upper clamping piece 62 may be configured to swing about the rotation shaft.

The lower clamping piece 61 and the upper clamping piece 62 have cup portions 611 and 621, respectively. The cup portions 611 and 621 have outer edges defined by smooth curves and are suitable for gripping objects and the like.

The sheath 2 may be made of any material, such as metal, and its surface may be coated with fluororesin. The metal may be stainless steel.

[Shaft 3]
As shown in FIGS. 2 to 5, the shaft 3 is inserted inside the hollow portion 23 of the sheath 2. As shown in FIGS. Although the shaft 3 has an elongated flat plate shape, it may have a cylindrical shape or the like. The shaft 3 has a distal end 31 (or one end) and a proximal end 32 (or the other end). Shaft 3 has a longitudinal direction extending along central axis 101 of sheath 2 . In a cross section (rectangular shape) obtained by cutting the shaft 3 perpendicularly to the longitudinal direction, the length of the long side is called the width of the shaft 3 and the length of the short side is called the thickness of the shaft 3 . 2 to 5 show that the width direction of the shaft 3 is the left-right direction, but the width direction is not limited to this, and the width direction may be the up-down direction. A distal end 31 of the shaft 3 is fixed to a shaft receiving portion 67 and connected to the clamping portion 6 via the shaft receiving portion 67 . A proximal end 32 of the shaft 3 is provided with a spherical bulge 33 having a diameter larger than the width of the shaft 3 . A proximal end 32 of the shaft 3 is connected to the rear handle 5 via a bulge 33 .

The shaft 3 may be made of any material, eg metal. The metal may be stainless steel.

[A pair of handles 4, 5]
As shown in FIG. 2, the pair of handles 4 and 5 is composed of a front handle 4 on the distal side (front side) and a rear handle 5 on the proximal side (rear side). The front handle 4 and the rear handle 5 have finger rings 41 and 51 provided with finger holes, respectively. The finger rings 41 and 51 are portions that are gripped and operated by the user. The front handle 4 and the rear handle 5 preferably have a hollow shape for weight reduction.

The front handle 4 and the rear handle 5 have pin receiving portions 42 and 52 provided with holes extending in the left-right direction, respectively. As shown in FIG. 6, the pin receiving portion 42 of the front handle 4 is composed of a pair of clamping portions 421 and 422 that clamp the pin receiving portion 52 of the rear handle 5 from left and right. Cylindrical pins 7 are inserted into the holes of the pin receiving portions 42 and 52 from one holding portion 421 side of the front handle 4 toward the other holding portion 422 side. A substantially cylindrical knob 71 is provided at the proximal end of the pin 7 and a male screw is provided at the distal end of the pin 7 . A female screw is provided in the hole of one holding portion 422 . A male thread provided at the tip of the pin 7 meshes with a female thread provided in the hole of the holding portion 422 . On the other hand, the pin 7 is loosely fitted in a hole provided in one clamping portion 421 of the front handle 4 and a pin receiving portion 52 of the rear handle 5 .

In this manner, the rear handle 5 is connected to the front handle 4 so as to be rotatable (or swingable) with respect to the front handle 4 . Hereinafter, rotation of the rear handle 5 in the direction toward the front handle 4 is referred to as forward rotation (clockwise rotation in FIG. 2), and rotation of the rear handle 5 in the direction away from the front handle 4 is referred to as backward rotation ( 2, referred to as counterclockwise rotation). A rotation shaft of the rear handle 5 extending in the left-right direction is constituted by a pin 7 .

The pin receiving portions 42, 52 of the front handle 4 and the rear handle 5 are arranged such that when the front handle 4 and the rear handle 5 are opened with respect to each other by a predetermined angle or more, the pin receiving portion 52 of the rear handle 5 is held by the pin receiving portion 42 of the front handle 4. It has a shape that abuts against and restricts further rotation.

A sheath receiving portion 43 for supporting the proximal portion of the sheath 2 is provided at the upper end portion of the front handle 4 . A sheath fixing portion 44 is provided on the distal side of the sheath receiving portion 43 . A distal portion of the sheath 2 is adhered and fixed to the sheath receiving portion 43 .

A fitting groove 54 is provided in the upper end portion 53 of the rear handle 5 . The proximal portion of the fitting groove 54 has a spherical shape complementary to the bulging portion 33 provided on the proximal end 32 of the shaft 3 , and its diameter is larger than the diameter of the bulging portion 33 . a little big. A distal portion of the fitting groove 54 extends in the longitudinal direction of the shaft 3 and has a width slightly larger than the width of the shaft 3 .

In this manner, the shaft 3 moves in the longitudinal direction in conjunction with the rear handle 5 as the rear handle 5 rotates. Specifically, when the rear handle 5 is rotated forward, the shaft 3 is interlocked and moved proximally (rearward). At this time, the shaft receiving portion 67 to which the distal end 31 of the shaft 3 is fixed also moves proximally (backward), and the clamping portion 6 closes. Thus, when the rear handle 5 rotates forward, the clamping portion 6 closes. When the rear handle 5 rotates backward, the shaft 3 moves distally (forward) in conjunction with it. At this time, the shaft receiving portion 67 also moves distally (forward), and the clamping portion 6 opens. Thus, when the rear handle 5 is rotated rearward, the holding portion 6 is opened.

The front handle 4 and the rear handle 5 may be made of any material, eg resin. The resin may be ABS, polyamide, polypropylene, polycarbonate, or the like.

[Stopper 8 and repulsive force generating member 9]
As shown in FIG. 2, a stopper 8 is provided between the front handle 4 and the rear handle 5. As shown in FIG. The stopper 8 abuts against the front handle 4 and the rear handle 5 when the rear handle 5 is rotated forward until the clamping portion 6 is closed, thereby restricting further forward rotation of the rear handle 5. have. This prevents the handles 4 and 5 from being damaged due to over-gripping.

In this embodiment, the stopper 8 has two regulating members 81, 82 separated from each other. The number of regulating members is not limited to this, and one or more regulating members may be provided. The regulating members 81, 82 have a cylindrical shape. The distal side (front side) restricting member 81 is not fixed to the front handle 4 and is configured to be slidable along the peripheral surface of the repulsive force generating member 9 such as a coil spring. The proximal (rear) restricting member 82 is fixed to the rear handle 5 . By providing the regulating members 81 and 82, the grip of the handles 4 and 5 is stabilized. If the restricting member 81 is fixed to the restricting member 82, the coil spring 9 is bent on the front handle 4 side. become. Therefore, the regulating member 81 is configured to be slidable along the circumferential surface of the coil spring 9 without being fixed.

As shown in FIG. 2 , a repulsive force generating member 9 is further provided between the front handle 4 and the rear handle 5 . The repulsive force generating member 9 is a repulsive force generating member that generates an elastic force (repulsive force) between the pair of handles 4, 5 in the direction in which the rear handle 5 moves away from the front handle 4 when the rear handle 5 is rotated forward. function as

In this embodiment, the repulsive force generating member 9 is a coil spring inserted into the hollow portion of the stopper 8 . In another embodiment, the repulsive force generating member 9 may be a torsion spring (torsion spring). When the repulsive force generating member 9 is a torsion spring, the repulsive force generating member 9 can also function as the stopper 8 .

In this embodiment, the coil spring 9 assumes a natural length when the clamping portion 6 is slightly closed from the fully opened state. In another embodiment, the coil spring 9 may have its natural length with the jaws 6 fully open.

The front handle 4 is provided with a groove portion 45 into which the front end of the coil spring 9 is loosely fitted.
The rear handle 5 is provided with a groove (not shown) into which the rear end of the coil spring 9 is loosely fitted. As described above, the rear end of the coil spring 9 is inserted into the hollow portion of the restricting member 82 , and the hollow portion communicates with the groove provided in the rear handle 5 . The (facing) surfaces 46, 55 of the front handle 4 and the rear handle 5 in which the grooves for the coil springs 9 are provided are flat.

Stopper 8 may be made of any material, for example metal. The metal may be stainless steel. The coil spring 9 may be made of any material, eg piano wire, hard steel wire, stainless steel.

FIG. 7 is a side view showing the forceps 1 with the clamping portion 6 closed. As described above, when the rear handle 5 is rotated forward until the clamping portion 6 is closed, the regulating members 81 and 82 of the stopper 8 come into contact with each other, and the stopper 8 comes into contact with the front handle 4 and the rear handle 5 as a whole. As a result, further forward rotation of the front handle 4 is restricted.

The user receives an elastic force (repulsive force) from the coil spring 9 during the transition from the state shown in FIG. 2 where the holding portion 6 is open to the state shown in FIG. Here, if the size of the part of the object to be gripped is large relative to the maximum opening angle of the gripping part 6, the gripping part 6 cannot grip the part well, so the rear handle 5 does not rotate, and the user receives no elastic force from the coil spring 9. In this case, the user can change the portion of the object to be grasped. By providing the coil spring 9 in this way, there is an effect that the user can appropriately select an object to be pinched by the pinching section 6 (part to be pinched). However, it should be understood that the repulsive force generating member 9 is selectively provided in the present invention.

When the stopper 8 abuts on the front handle 4 and the rear handle 5 as a whole, the larger the distance from the finger ring portions 41, 51 that the user grips and operates in the front handle 4 and the rear handle 5 to the stopper 8, the more the stopper becomes a fulcrum. , the bending moment applied to the pair of handles 4 and 5 with the portion gripped by the user as the point of action increases, and the pair of handles 4 and 5 bend accordingly. Through this bending, the user can feel that the gripping portion 6 has reliably gripped the object. Since the front handle 4 and the rear handle 5 are made of resin, the deflection of the pair of handles 4 and 5 is increased, so that this effect can be obtained more remarkably.

[Other embodiments]
The scope of the invention should not be understood to be limited to the content of the embodiments described above. Also, other embodiments may be configured by freely combining the features described in the above embodiments. Also, various improvements, design changes and omissions may be added to the above-described embodiments.

For example, in the embodiment described above, the coil spring 9 is inserted into the hollow portion of the stopper 8 . In other embodiments, coil spring 9 may be provided separately from stopper 8 . For example, the coil spring and the stopper 8 may be vertically separated from each other.

Further, in the above-described embodiment, the lower clamping piece 61 and the upper clamping piece 62 of the clamping part 6 are provided with cup portions 611 and 621 suitable for gripping or picking up an object. In another embodiment, as shown in FIGS. 8 and 9, in a clamping portion 26 having a lower clamping piece 261 and an upper clamping piece 262, the distal end (front end) of the upper clamping piece 262 is provided with an object cutting portion. A suitable cutout 263 may be provided.

Moreover, in the above-described embodiment, the sheath 2 is provided that extends linearly from the distal end 21 to the proximal end 22 . In another embodiment, as shown in FIG. 10, the distal region including the distal end 21 provided with the clamps 6 may be curved with respect to the proximal region. In this embodiment, the sheath 2 includes a first portion 201 extending linearly from the proximal end 22, a second portion 202 extending linearly from the distal end 21, and bending the first and second portions. and a bent portion 203 that connects with the . The shaft 3 inserted into the hollow portion 23 of the sheath 2 is similarly bent. According to this embodiment, the gripping portion 6 can be oriented in a desired direction in the body cavity to more preferably grasp a biological tissue. In this embodiment, the proximal portion of the sheath 2 may be supported by the sheath receiver 43 so as to be rotatable relative to the sheath receiver 43 . In addition, the bent portion 203 is elastically deformed in the outer cylindrical tube and extends substantially linearly, and is bent when it passes through the outer cylindrical tube and enters the human body.

As shown in FIG. 11 , the forceps 1 having the bent portion 203 may be provided with a plurality of slits 210 in the bent portion 203 . By providing slit 210 , sheath 2 can be easily bent at bending portion 203 .

12 is a partially enlarged view of the bent portion 203 of the forceps 1 shown in FIG. 11. FIG. The bent portion 203 is provided with five slits 210 formed by cutting the sheath 2 . The slit 210 has a linear portion 204 obtained by cutting the sheath 2 linearly and a circular portion 205 provided at the end of the cut. Although the number of slits 210 is five in FIG. 12, it is not limited to this. In addition, although the bending angle of the sheath 2 is 20° in FIG. 12, it is not limited to this. Furthermore, although the diameter of the circular portion 205 is 0.4 mm in FIG. 12, it is not limited to this.

In FIG. 12 , the slit 210 is provided on the side of the bending portion 203 where the sheath 2 bends (on the upper side in FIG. 12 ), and when the bending portion 203 is bent, the width of the slit 210 becomes narrower to facilitate bending. to The position where the slit 210 is formed is not limited to this, and the slit 210 may be formed on the side opposite to the bending side (lower side in FIG. 12) so that the width of the slit widens when bending.

FIG. 13 is a partially enlarged view of forceps 1 before bending portion 203 is bent. In the forceps 1, the diameter r of the sheath 2 is 3 mm, and five slits 210 are provided in parallel at a pitch p of 1 mm from a position at a distance l of 6 mm from the distal end. The width a of the slit 210 in the direction of the central axis c is 1 mm. The slit 210 has an inclination angle θ of 10° with respect to the direction perpendicular to the central axis c. Note that the dimensions and angles described here are only examples, and can be appropriately selected according to the bending angle and ease of bending of the sheath.

Further, as shown in FIG. 14, in the forceps 1 having the bent portion 203, the bent portion 203 may be provided with a plurality of slits 220 having different shapes. 15 is a partially enlarged view of the bent portion 203 of the forceps 1 shown in FIG. 14. FIG. 16 and 17 are partially enlarged side and plan views of the sheath 2 before the bending portion 203 is bent.

As shown in FIG. 16 , before bending the sheath 2 , the two slits 220 on the distal side of the total of five slits 220 are inclined distally at the cutting end (the lower part in FIG. 16 ), The three proximal slits 220 taper proximally at the cut ends. This facilitates bending of the sheath 2 . It should be noted that the number of slits 220 with cutting ends slanted proximally is preferably greater than the number of slits 220 with cutting ends slanted distally.

An inclination angle α between the central axis c and the slit 220 is, for example, 60°. As shown in FIG. 15, when the sheath 2 is curved, the slit 220 may be narrowed and the opening may be closed on the upper side of the slit 220 (the upper side in FIG. 15).

As shown in FIG. 17, of the five slits 220, the slits 220b and 220c, and the slits 220a and 220d are symmetrical with respect to a plane perpendicular to the central axis c. A slit 220e is further provided on the proximal side of the slit 220d.

As can be seen from FIG. 17, in the slits 220a, 220b, 220c, and 220d, since a part of the slit extends in a direction parallel to the longitudinal direction (central axis c) of the sheath, the torque with the axis c as the central axis Improves strength.

FIG. 18 is a modified example of the shaft 3 used in the forceps 1 according to the embodiment of the present invention, (a) is a plan view, and (b) is an arrow cut along the EE line in (a). FIG. 3 is a cross-sectional view when viewed in a direction; As described above, in the embodiment of the present invention, the cross-sectional shape of the shaft 3 is an elongated flat plate shape. Only the portion 3b through which the 203 is inserted may have a flat plate shape, and the other portions 3a and 3c through which the first portion 201 and the second portion 202 are inserted may be cylindrical.

In this way, by forming the portion 3b into which the bent portion 203 of the shaft 3 is inserted to have a flat plate shape with a rectangular cross section, the strength of the shaft 3 is increased and the resistance felt by the user when gripping and operating the rear handle 5 is increased. feeling can be reduced.

Moreover, in the above-described embodiment, an example in which the stopper 8 is made of stainless steel has been described. Including this example, the restricting members 81 and 82 of the stopper 8 may be made of a ferromagnetic material (permanent magnet). The ferromagnetic material may be ferrite, neodymium, or the like. The two permanent magnets are arranged so that the same poles face each other. As a result, when the rear handle 5 is rotated forward, a repulsive force is generated between the pair of handles 4 and 5 in the direction in which the rear handle 5 moves away from the front handle 4 . In other words, the regulating members 81 and 82 function not only as the stopper 8 but also as repulsive force generating members. In this example, the repulsive force generating member 9 may be omitted.

Further, in the above-described embodiment, the color of the rear handle may be changed according to the type of forceps, that is, the type of processing section such as a clamping section, and the type of sheath such as the presence or absence of a bent section and the angle thereof. FIG. 19 shows an example in which the color of the rear handle is changed according to the type of forceps, (a) is a grasping forceps whose processing part has a grasping function, (b) is a cutting forceps whose processing part has a cutting function, ( In c), the grasping forceps are bent forceps having bent portions, and the rear handles are light blue, pink, and yellow, respectively. In this way, by changing the color of the rear handle according to the type of forceps, it is possible to prevent mistaking the forceps during operation. Although the color of the entire rear handle is changed here, the color of the front handle or the color of both the front handle and the rear handle may be changed. Also, if the operator can recognize the difference between the forceps, it is sufficient to change the color of a part of the forceps.

1 forceps 2 sheath 21 distal end (of sheath) 22 proximal end (of sheath) 23 hollow (of sheath) 3 shaft 31 distal end (of shaft) 32 proximal end (of shaft) 4 front handle 5 rear Handles 41, 51 Finger ring portions 6, 26 Clamping portion 7 Pin 8 Stoppers 81, 82 Regulating member 9 Repulsive force generating member (coil spring)
101 central axis 201 (sheath) first portion 202 (sheath) second portion 203 (sheath) bending portions 210, 220 slit 263 cutting portion

Claims (13)

a sheath having a distal end and a proximal end, a hollow portion, and a clamping portion provided at the distal end for opening and closing to grasp an object;
a distal front handle supporting the proximal end of the sheath; and a proximal rear handle rotatably coupled to the front handle relative to the front handle;
It is inserted into the hollow portion of the sheath, has a longitudinal direction, has one end connected to the clamping portion and the other end connected to the rear handle, and moves in the longitudinal direction in response to rotation of the rear handle. a shaft configured to open and close the clamping portion by
The front handle and the rear handle are made of resin,
Further, between the front handle and the rear handle, the front handle moves toward the rear handle when the rear handle is rotated toward the front handle until the clamp is closed. Provided with a stopper configured to restrict rotation,
forceps. A repulsive force generating member is further provided between the front handle and the rear handle for applying a repulsive force in a direction in which the rear handle moves away from the front handle when the rear handle is rotated in a direction approaching the front handle. is provided,
The forceps according to claim 1. the stopper has a hollow portion,
The repulsive force generating member is inserted into the hollow portion of the stopper,
Forceps according to claim 2. The stopper has one or more regulating members,
At least one of the one or more regulating members is configured to be slidable along the repulsive force generating member.
Forceps according to claim 3. The holding part is provided with a cutting piece for gripping and cutting the target object,
The forceps according to any one of claims 1-4. The sheath has a first portion that extends linearly from the proximal end and a second portion that bends relative to the first portion and extends toward the distal end.
The forceps according to any one of claims 1-5. The sheath is
a first portion extending linearly from the proximal end;
a second portion extending linearly from the distal end;
a bending portion that bends and connects the first portion and the second portion;
The bend has a slit cut into the sheath,
The forceps according to any one of claims 1-5. The slit includes a slit on the proximal end side of the bending portion and a slit on the distal end side of the bending portion,
A slit on the proximal end side of the bent portion is cut obliquely from the surface of the sheath toward the proximal end, and a slit on the distal end side of the bent portion is cut from the surface of the sheath to the distal end. slantly cut in the direction of the edge,
Forceps according to claim 7. The number of slits on the distal end side of the bend is greater than the number of slits on the proximal end side of the bend,
Forceps according to claim 8. The slit includes a portion parallel to the longitudinal direction of the sheath,
The forceps according to any one of claims 7-9. The slit is a plurality of slits provided at a predetermined pitch along the longitudinal direction of the sheath,
The forceps according to any one of claims 7-10. The shaft has a flat plate-shaped portion that is inserted through the bent portion, and has a cylindrical shape at the other portion.
The forceps according to any one of claims 7-11. a sheath having a distal end and a proximal end, a hollow portion, and a processing portion provided at the distal end for opening and closing to treat an object;
a distal front handle supporting the proximal end of the sheath; and a proximal rear handle rotatably coupled to the front handle relative to the front handle;
It is inserted into the hollow part of the sheath, has a longitudinal direction, has one end connected to the processing part and the other end connected to the rear handle, and moves in the longitudinal direction according to the rotation of the rear handle. a shaft configured to actuate the processing unit by
Between the front handle and the rear handle, a further rotation of the front handle in a direction approaching the rear handle is restricted when the rear handle is rotated in a direction approaching the front handle. A configured stopper is provided,
The front handle and the rear handle are made of resin,
the rear handle is colored in a predetermined color according to the function of the treatment section and/or the shape of the sheath;
forceps.

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