WO2019107439A1 - Forceps - Google Patents

Abstract

A forceps 1 is equipped with: a sheath 2 provided with a clamping portion 6 at a distal end 21; a distal-side front handle 4 that supports a proximal end 22 of the sheath 2, and a proximal-side rear handle 5 connected to the front handle 4 so as to be capable of rotating 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 3 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.

Description

forceps

The present invention relates to a forceps for grasping, cutting, etc. a living tissue in endoscopic surgery.

In recent years, in surgical operations, less invasive endoscopic surgery has come to be performed in place of conventional open surgery. In endoscopic surgery, a plurality of small holes are made in the abdominal wall, the endoscope is inserted into the abdominal cavity, and images in the abdominal cavity are observed with a monitor television, and performed using a forceps, an electric knife or the like. Since endoscopic surgery does not require open surgery, there is an advantage that the burden on the patient is small and recovery after surgery is quick.

Patent Document 1 discloses a general forceps used in endoscopic surgery. The forceps has an elongated insert inserted into the abdominal cavity and a pair of handles that the user grips and manipulates. The distal end of the insertion portion is provided with a holding portion for opening and closing to hold and cut a living tissue. The user can open and close the holding unit by operating the pair of handle units. In this forceps, when the pair of handles are closed until they come in contact with each other, the sandwiching portion can be closed to grasp the living tissue and the like.

Patent No. 2504936 specification

By the way, in endoscopic surgery, all surgical instruments are expensive instruments that are intended to be reused, and it is difficult to create an environment where temporary training and proctoring can be performed to enable technique training at a facility. It is necessary to make it disposable and to lower the hurdles to introduce. Furthermore, in endoscopic surgery, when the user grasps an object such as a living tissue with a forceps, it is preferable that the user appropriately senses the feeling of grasping the object. However, in the forceps provided with the elongated insertion portion, there is a problem that the feeling of gripping the object is not properly transmitted from the holding portion to the user via the pair of handle portions.

Then, this invention makes it a subject to provide the forceps which can transmit appropriately the touch which grasped the object from the pinching part to the user.

According to one aspect of the invention:
A sheath having a distal end and a proximal end, a hollow portion, and a holding portion provided at the distal end for opening and closing to grip 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;
The sheath is inserted into the hollow portion, has a longitudinal direction, has one end connected to the holding portion and the other end connected to the rear handle, and moves in the longitudinal direction according to rotation of the rear handle And a shaft configured to open and close the holding portion,
The forceps are 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 a direction approaching the front handle until the holding portion is closed, the front handle is moved in a direction approaching the rear handle. There is provided a stopper configured to restrict further rotation,
Dumplings are provided.

According to one aspect of the present invention, if the front handle and the rear handle that occupy most of the weight of the forceps are made of resin, the weight reduction of the forceps can be realized and it can be 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, as the distance from the portion (finger ring etc.) held by the user at the front handle and the rear handle (such as a finger ring) to the stopper increases, the bending moment applied from the user to the pair of handles with the stopper as the fulcrum Becomes larger and the pair of handles bends accordingly. The user can obtain a feeling that the object is reliably grasped by the holding unit through this deflection.

It is a perspective view showing a forceps concerning an embodiment of the present invention. It is a side view showing a forceps concerning an embodiment of the present invention. It is a top view showing a forceps concerning an embodiment of the present invention. It is a top view which shows the clamping part of the forceps which concerns on embodiment of this invention. FIG. 5 is a cross-sectional view of FIG. 4 taken along the line AA and viewed in the direction of the arrow. It is an assembly drawing of a pair of handle. It is a side view corresponding to FIG. 2 which shows the forceps in the state which closed the clamping part. It is a top view showing a forceps concerning other embodiments of the present invention. FIG. 9 is a cross-sectional view of FIG. 8 taken along the line B-B and viewed in the direction of the arrow. It is a side view showing a forceps according to another embodiment of the present invention. It is a side view showing a forceps according to another embodiment of the present invention. It is the elements on larger scale of the forceps described in FIG. It is the elements on larger scale of the forceps before making a bending part bend. It is a side view showing a forceps according to another embodiment of the present invention. It is the elements on larger scale of the forceps described in FIG. It is the elements on larger scale of the side of the forceps before making a bending part bend. It is the elements on larger scale of the plane of forceps before making a bending part bend. It is the (a) top view and the (b) sectional view showing the modification of the shaft used for the forceps concerning the embodiment of the present invention. It is a side photograph which shows the forceps which concern on another embodiment of this 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, top, and bottom may be used, but these terms are merely used to facilitate understanding of the description. Therefore, it should not be understood that the present invention is limited by these terms.

FIG. 1 is a perspective view showing a forceps 1 according to an embodiment of the present invention, and FIG. 2 is a side view showing the forceps 1. The forceps 1 is used to perform grasping, cutting, etc. of a living tissue in endoscopic surgery. For example, forceps 1 grasps or cuts a hernia in a percutaneous endoscopic disc herniectomy (PED: Percutaneous Endoscopic Discectomy) performed using a percutaneous endoscopic system. It may be used to extract. Although forceps 1 is assumed to be used as a disposable product, the present invention is not limited thereto.

The forceps 1 includes a sheath 2, a shaft 3, and a pair of handles 4 and 5. The sheath 2 is an insertion portion to be inserted into a body cavity (for example, the abdominal cavity). The pair of handles 4 and 5 are portions that the user grips and operates.

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

In this embodiment, the sheath 2 linearly extends along a central axis 101 extending in the front-rear direction. The sheath 2 has a distal end 21 and a proximal end 22. Hereinafter, the term “distal end” and “proximal end” should be understood as referring not only to the end point but also to a region including the end point and the vicinity thereof. The sheath 2 has a hollow portion 23 extending in the front-rear direction and penetrating the sheath 2.

FIG. 4 is a plan view showing the sandwiching portion 6 of the forceps 1, and FIG. 5 is a cross-sectional view of FIG. 4 taken along the 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 unit 6 has a function of opening and closing to hold an object or the like.

The clamping unit 6 has a lower clamping piece 61 and an upper clamping piece 62. In this embodiment, the lower holding piece 61 is provided integrally with the sheath 2 and does not swing relative to the sheath 2. The upper clamping piece 62 is provided with two holes extending in the left-right direction. The pin 63 is loosely fitted in the upper hole, and 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. Here, a shaft receiving portion 67 is disposed in the hollow portion 23 of the sheath 2. The shaft receiving portion 67 has a groove opening on the proximal side (rear side), and the shaft 3 receives the shaft 3. 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. Thus, first, the upper clamping piece 62 can swing relative to the sheath 2 with the pin 63 as the rotation axis. Further, the link 65 can swing with respect to the upper holding piece 62 and the shaft receiving portion 67, with the pins 64 and 66 as rotating shafts.

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

In another embodiment, both the lower holding piece 61 and the upper holding piece 62 may be configured to swing with respect to the rotation axis.

The lower holding piece 61 and the upper holding piece 62 have cup portions 611 and 621, respectively. The cups 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 a fluorocarbon resin. The metal may be stainless steel.

[Shaft 3]
As shown in FIGS. 2 to 5, the shaft 3 is inserted into the hollow portion 23 of the sheath 2. The shaft 3 has an elongated flat plate shape, but 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). The shaft 3 has a longitudinal direction extending along the central axis 101 of the sheath 2. In a cross section (rectangle) obtained by cutting the shaft 3 perpendicularly to the longitudinal direction, the length of the long side is referred to as the width of the shaft 3 and the length of the short side is referred to as the thickness of the shaft 3. In FIGS. 2 to 5, the width direction of the shaft 3 is illustrated as being in the left-right direction. However, the present invention is not limited to this, and the width direction may be in the up-down direction. The distal end 31 of the shaft 3 is fixed to the shaft receiving portion 67, and is connected to the clamping portion 6 via the shaft receiving portion 67. The proximal end 32 of the shaft 3 is provided with a spherical bulging portion 33 having a diameter larger than the width of the shaft 3. The proximal end 32 of the shaft 3 is connected to the rear handle 5 via a bulging portion 33.

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

[Pair of handles 4, 5]
As shown in FIG. 2, the pair of handles 4 and 5 are configured by the front handle 4 on the distal side (front side) and the 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 ring portions 41 and 51 are portions that the user grips and operates. The front handle 4 and the rear handle 5 preferably have a hollow shape to reduce the weight.

The front handle 4 and the rear handle 5 respectively have pin receiving portions 42 and 52 provided with holes extending in the left-right direction. As shown in FIG. 6, the pin receiving portion 42 of the front handle 4 includes a pair of holding portions 421 and 422 which hold the pin receiving portion 52 of the rear handle 5 from the left and right. The cylindrical pin 7 is inserted into the holes of the pin receiving portions 42 and 52 from the side of one holding portion 421 of the front handle 4 toward the other holding portion 422 side. The proximal end of the pin 7 is provided with a substantially cylindrical knob 71, and the distal end of the pin 7 is provided with an external thread. A female screw is provided in the hole of one of the holding portions 422. An external thread provided at the tip of the pin 7 engages with an internal thread provided in the hole of the holding portion 422. On the other hand, the pin 7 is loosely fitted in the hole provided in the one holding portion 421 of the front handle 4 and the pin receiving portion 52 of the rear handle 5.

Thus, the rear handle 5 is connected to the front handle 4 rotatably (or pivotably) relative to the front handle 4. Hereinafter, the rotation of the rear handle 5 in the direction approaching the front handle 4 is referred to as forward rotation (clockwise in FIG. 2), and the rotation of the rear handle 5 in the direction away from the front handle 4 is backward (( In FIG. 2, it is called counterclockwise rotation). The rotation axis of the rear handle 5 extending in the left-right direction is constituted by the pin 7.

When the front handle 4 and the rear handle 5 open the front handle 4 and the rear handle 5 relative to each other by a predetermined angle or more, the pin receiver 52 of the rear handle 5 corresponds to the pin receiver 42 of the front handle 4. It has a shape that abuts on to restrict further rotation.

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

A fitting groove 54 is provided at 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 at the proximal end 32 of the shaft 3, and the diameter thereof is smaller than the diameter of the bulging portion 33 a little big. The 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 way, the shaft 3 moves in the longitudinal direction in conjunction with the rear handle 5 in response to the rotation of the rear handle 5. Specifically, when the rear handle 5 rotates forward, the shaft 3 interlocks and moves proximally (rearward). At this time, the shaft receiving portion 67 to which the distal end 31 of the shaft 3 is fixed is also moved to the proximal side (backward), and the clamping portion 6 is closed. As described above, when the rear handle 5 rotates forward, the clamping unit 6 is closed. When the rear handle 5 rotates backward, the shaft 3 interlocks and moves to the distal side (forward). At this time, the shaft receiving portion 67 also moves to the distal side (forward), and the clamping portion 6 is opened. As described above, when the rear handle 5 rotates backward, the clamping unit 6 is opened.

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

[Stopper 8 and Repulsion Generating Member 9]
As shown in FIG. 2, a stopper 8 is provided between the front handle 4 and the rear handle 5. The stopper 8 functions to restrict further rotation of the rear handle 5 forward by contacting the front handle 4 and the rear handle 5 when the rear handle 5 is rotated forward until the clamping portion 6 is closed. Have. This can prevent breakage of the handles 4 and 5 due to excessive gripping.

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

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

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

In this embodiment, the coil spring 9 has a natural length in a state in which the clamping portion 6 is slightly opened from a completely opened state. In another embodiment, the coil spring 9 may be a natural length with the clamping portion 6 fully open.

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

The 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, such as piano wire, hard steel wire, stainless steel.

FIG. 7 is a side view showing the forceps 1 in a state in which the holding portion 6 is closed. As described above, when the rear handle 5 is rotated forward until the clamping portion 6 is closed, the restriction members 81 and 82 of the stopper 8 abut each other, and the stopper 8 abuts on the front handle 4 and the rear handle 5 as a whole. Thereby, further rotation of the front handle 4 forward is restricted.

The user receives an elastic force (repulsive force) from the coil spring 9 until transitioning from the state of FIG. 2 in which the clamping portion 6 is opened to the state of FIG. 7 in which the clamping portion 6 is closed. Here, if the dimension of the portion to be grasped in the object is larger than the maximum opening angle of the clamping portion 6, the clamping portion 6 can not grasp the portion properly, so the rear handle 5 does not rotate. Does not receive an elastic force from the coil spring 9. In this case, the user can change the portion to be grasped in the object. As described above, the provision of the coil spring 9 has an effect that the user can appropriately select the pinch target (target portion) by the pinch portion 6. However, in the present invention, it should be understood that the repulsive force generating member 9 is a configuration provided selectively.

When the stopper 8 contacts the front handle 4 and the rear handle 5 as a whole, the larger the distance from the finger rings 41 and 51 which the user grips and operates on the front handle 4 and the rear handle 5, the stopper The bending moment applied to the pair of handles 4 and 5 with the portion held by the user as the point of action increases, and the pair of handles 4 and 5 bends accordingly. The user can obtain a feeling that the object is reliably grasped by the holding unit 6 through this deflection. Since the front handle 4 and the rear handle 5 are made of resin, the deflection of the pair of handles 4 and 5 becomes large, so that this effect can be obtained more remarkably.

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

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

Further, in the above-described embodiment, the lower holding piece 61 and the upper holding piece 62 of the holding unit 6 are provided with the cup portions 611 and 621 suitable for holding or collecting the object. In another embodiment, as shown in FIGS. 8 and 9, in the pinching portion 26 having the lower pinching piece 261 and the upper pinching piece 262, cutting of the object at the distal end (front end) of the upper pinching piece 262 A cutting portion 263 suitable for

Moreover, in the above-mentioned embodiment, the sheath 2 extended linearly from the distal end 21 to the proximal end 22 was provided. In another embodiment, as shown in FIG. 10, the distal region including the distal end 21 provided with the holding portion 6 may be bent relative to the proximal region. In this embodiment, the sheath 2 bends a first portion 201 extending linearly from the proximal end 22, a second portion 202 extending linearly from the distal end 21, a first portion and a second portion And a bent portion 203 to be connected. The shaft 3 inserted into the hollow portion 23 of the sheath 2 is similarly bent. According to this embodiment, the holding portion 6 can be directed in a desired direction in the body cavity to more preferably hold the living 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. The bending portion 203 is elastically deformed in the outer cylindrical tube and extends in a substantially linear shape, and bends at a stage of passing through the outer cylindrical tube and entering the human body.

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

FIG. 12 is a partially enlarged view of the bending portion 203 of the forceps 1 shown in FIG. The bending portion 203 is provided with five slits 210 formed by cutting the sheath 2. The slit 210 has a straight portion 204 formed by cutting the sheath 2 straight and a circular portion 205 provided at the end of the cut. Although the number of slits 210 is five in FIG. 12, the invention is not limited to this. Moreover, although the bending angle of the sheath 2 was 20 degrees in FIG. 12, it is not limited to this. Furthermore, in FIG. 12, the diameter of the circular portion 205 is 0.4 mm, but it is not limited thereto.

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

FIG. 13 is a partially enlarged view of the forceps 1 before the 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 the position at which the distance l from the distal end is 6 mm. The width a of the slit 210 in the central axis c direction is 1 mm. The slit 210 has an inclination angle θ of 10 ° with respect to the direction perpendicular to the central axis c. In addition, the dimension and angle described here are an example, and it can select suitably according to a bending angle or the bending easiness of a sheath.

Further, as shown in FIG. 14, in the forceps 1 having the bending portion 203, the bending portion 203 may be provided with a plurality of slits 220 having different shapes. FIG. 15 is a partially enlarged view of the bending portion 203 of the forceps 1 shown in FIG. 16 and 17 are partially enlarged views of the side surface and the plane 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 out of the total of five slits 220 have the cut end (lower in FIG. 16) inclined to the distal side, The three slits 220 on the proximal side are inclined in the proximal direction at the cut end. This facilitates the bending of the sheath 2. It is preferable that the number of slits 220 in which the incised end is inclined to the proximal side is larger than the number of slits 220 in which the incised end is inclined to the distal side.

The 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 bent, the slit 220 may be narrowed on the upper side (upper side in FIG. 15) of the slit 220 to close the opening.

As shown in FIG. 17, among the five slits 220, the slits 220b, the slits 220c, 220a, and the slits 220d are respectively symmetrical in 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, a part of the slits extends in a direction parallel to the longitudinal direction (central axis c) of the sheath. Strength is improved.

FIG. 18 shows a modification of the shaft 3 used for the forceps 1 according to the embodiment of the present invention, in which (a) is a plan view, and (b) is an arrow of FIG. It is sectional drawing when it sees in the direction. As described above, in the embodiment of the present invention, although the cross-sectional shape of the shaft 3 has an elongated flat plate shape, it has been described that a cylindrical shape etc. may be other than that, but as shown in FIG. Only the part 3b through which the part 203 is inserted may be flat, and the other parts 3a and 3c through which the first part 201 and the second part 202 are inserted may be cylindrical.

As described above, by making the portion 3b through which the bent portion 203 of the shaft 3 is inserted into a flat plate having a rectangular cross section, the user feels resistance when the rear handle 5 is gripped and operated while the strength of the shaft 3 is increased. Feeling can be reduced.

Moreover, in the above-mentioned embodiment, the example which makes stopper 8 stainless steel was demonstrated. The control members 81 and 82 of the stopper 8 may be made of a ferromagnetic material (permanent magnet) including this example. The ferromagnetic material may be ferrite, neodymium or the like. The two permanent magnets are arranged such 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. That is, the restriction members 81 and 82 not only function as the stopper 8 but also function as a repulsive force generation member. In this example, the repulsive force generation member 9 may be omitted.

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 portion such as the holding portion or the type of sheath such as the presence or absence of a bending portion or an angle. 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 having a grasping function for the processing unit, (b) is a cutting forceps having a cutting function for the treatment section, c) is a bending forceps having a bending portion, and the color of the rear handle is light blue, pink and yellow, respectively. As described above, changing the color of the rear handle according to the type of the ladder can prevent confusion of the ladder during work. In addition, although the color of the whole rear handle was changed here, you may change the color of the front handle, and the color of both the front handle and the rear handle. In addition, as long as the operator can recognize the difference in forceps, it is sufficient to change only some of the colors.

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

Claims (14)

A sheath having a distal end and a proximal end, a hollow portion, and a holding portion provided at the distal end for opening and closing to grip 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;
The sheath is inserted into the hollow portion, has a longitudinal direction, has one end connected to the holding portion and the other end connected to the rear handle, and moves in the longitudinal direction according to rotation of the rear handle And a shaft configured to open and close the holding portion,
The front handle and the rear handle are made of resin.
forceps. Between the front handle and the rear handle, when the rear handle is rotated in the direction approaching the front handle until the clamping portion is closed, the front handle further moves in the direction approaching the rear handle A stopper configured to regulate rotation is provided,
The forceps according to claim 1. Between the front handle and the rear handle, there is further provided a repulsive force generating member which causes the rear handle to exert a repulsive force away from the front handle when the rear handle is rotated in a direction approaching the front handle. Provided
The forceps according to claim 2. The stopper has a hollow portion,
The repulsive force generation member is inserted into the hollow portion of the stopper.
A forceps according to claim 3. The stopper comprises one or more regulating members,
At least one of the one or more restriction members is configured to slide along the repulsion generation member,
The forceps according to claim 4. The clamping unit is provided with a cutting piece for gripping and cutting an object.
The forceps according to any one of claims 1 to 5. The sheath has a first portion linearly extending from the proximal end and a second portion bent relative to the first portion and extending toward the distal end.
The forceps according to any one of claims 1 to 6. 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 to 6. The slit includes a slit at the proximal end and a slit at the distal end,
The slit on the proximal end side is cut obliquely from the surface of the sheath toward the proximal end, and the slit on the distal end side is inclined from the surface of the sheath to the distal end Cut in,
A forceps according to claim 8. The number of slits on the distal end side is greater than the number of slits on the proximal end side,
A forceps according to claim 9. The slit includes a portion parallel to the longitudinal direction of the sheath.
A forceps according to any one of claims 8 to 10. The slits are a plurality of slits provided at a predetermined pitch along the longitudinal direction of the sheath.
A forceps according to any of claims 8-11. In the shaft, a portion through which the bent portion is inserted has a flat plate shape, and the other portion has a cylindrical shape.
The forceps according to any one of claims 8 to 12. A sheath having a distal end and a proximal end, a hollow portion, and a processing unit 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;
The sheath is inserted into the hollow portion, has a longitudinal direction, has one end connected to the processing portion and the other end connected to the rear handle, and moves in the longitudinal direction according to rotation of the rear handle And a shaft configured to operate the processing unit;
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 processing unit and / or the shape of the sheath.
forceps.

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