JPWO2019107439A1 - forceps - Google Patents

Abstract

The forceps 1 are rotatably fronted with respect to a sheath 2 having a holding portion 6 at the distal end 21, a front handle 4 on the distal side supporting the proximal end 22 of the sheath 2, and a front handle 4. It has a rear handle 5 on the proximal side connected to the handle 4, one end 31 inserted into the hollow portion of the sheath 2 and connected to the holding portion 6, and the other end 32 connected to the rear handle 5. It includes a shaft 3 configured to move in the longitudinal direction in response to the rotation of 5 to open and close the holding portion 6. The front handle 4 and the rear handle 5 are made of resin.

Description

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

In recent years, minimally invasive endoscopic surgery has come to be performed in surgical surgery instead of conventional open surgery. Endoscopic surgery is performed by making a plurality of small holes in the abdominal wall, inserting an endoscope into the abdominal cavity, and observing the image in the abdominal cavity on a monitor TV using forceps, an electric knife, or the like. Since endoscopic surgery does not require laparotomy, it has the advantage of less burden on the patient and quick recovery after surgery.

Patent Document 1 discloses general forceps used in endoscopic surgery. The forceps have an elongated insertion section that is inserted into the abdominal cavity and a pair of handles that the user grips and operates. At the distal end of the insertion portion, a holding portion is provided for opening and closing to grip and cut the living tissue. The holding portion can be opened and closed by the user operating the pair of handle portions. With this forceps, when the pair of handles are closed until they come into contact with each other, the holding portion is closed and the living tissue can be gripped.

Patent No. 2504936

By the way, in endoscopic surgery, all surgical instruments are expensive instruments that are supposed to be reused, and it is difficult to build an environment where temporary usage and procedure training can be conducted at the facility by inviting a proctor. It is necessary to make it disposable and lower the hurdle to introduce. Further, in endoscopic surgery, it is preferable that when a user grasps an object such as a living tissue with forceps, the user can appropriately feel the feeling of grasping the object. However, the forceps provided with the elongated insertion portion have a problem that the feeling of grasping the object is not appropriately transmitted from the holding portion to the user via the pair of handle portions.

Therefore, it is an object of the present invention to provide forceps capable of appropriately transmitting the feeling of grasping an object from the holding portion 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 that supports the proximal end of the sheath, and a proximal rear handle that is rotatably connected 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 holding portion and the other end connected to the rear handle, and moves in the longitudinal direction in accordance with the rotation of the rear handle. A shaft configured to open and close the holding portion is provided.
The front handle and the rear handle are provided with forceps 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 a stopper configured to regulate further rotation,
Forceps are provided.

According to one aspect of the present invention, if the front handle and the rear handle, which occupy 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 the direction approaching the front handle until the holding portion is closed, further rotation of the front handle in the direction approaching the rear handle is restricted by the stopper. At this time, the greater the distance between the front handle and the rear handle that the user grips and operates (such as a ring) and the stopper, the more the bending moment applied by the user to the pair of handles with the stopper as the fulcrum and the part gripped by the user as the force point. Becomes larger and the pair of handles flexes accordingly. Through this bending, the user can get the feeling that the object is firmly grasped by the holding portion.

It is a perspective view which shows the forceps which concerns on embodiment of this invention. It is a side view which shows the forceps which concerns on embodiment of this invention. It is a top view which shows the forceps which concerns on embodiment of this invention. It is a top view which shows the holding part of the forceps which concerns on embodiment of this invention. FIG. 4 is a cross-sectional view taken along the line AA when viewed in the direction of the arrow. It is an assembly drawing of a pair of handles. It is a side view corresponding to FIG. 2 which shows the forceps in the state which the holding part is closed. It is a top view which shows the forceps which concerns on other embodiment of this invention. FIG. 8 is a cross-sectional view taken along the line BB and viewed in the direction of the arrow. It is a side view which shows the forceps which concerns on still another Embodiment of this invention. It is a side view which shows the forceps which concerns on still another Embodiment of this invention. FIG. 11 is a partially enlarged view of the forceps shown in FIG. It is a partial enlarged view of the forceps before bending a bending part. It is a side view which shows the forceps which concerns on still another Embodiment of this invention. It is a partially enlarged view of the forceps shown in FIG. It is a partial enlarged view of the side surface of the forceps before bending the bending part. It is a partial enlarged view of the plane of the forceps before bending the bending part. It is (a) plan view and (b) sectional view which shows the modification of the shaft used for the forceps which concerns on embodiment of this invention. It is a side photograph which shows the forceps which concerns on still another Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the embodiment, terms indicating a direction such as front, back, left, right, top, and bottom may be used, but these terms are used only for facilitating the understanding of the description. Therefore, it should not be understood that these terms limit the present invention.

FIG. 1 is a perspective view showing the forceps 1 according to the embodiment of the present invention, and FIG. 2 is a side view showing the forceps 1. The forceps 1 is used for grasping and cutting living tissue in endoscopic surgery. For example, the forceps 1 are finally gripped or cut in a percutaneous endoscopic discectomy (PED) performed using a percutaneous endoscopic system. It may be used for extraction. The forceps 1 is intended to be used as a disposable product, but 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 inserted into a body cavity (for example, the abdominal cavity). The pair of handles 4 and 5 are parts that the user holds and operates by hand.

[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 the anterior side), and the side opposite to the distal side and provided with the pair of handles 4 and 5 is the proximal side. (Or rear side). This also applies to other parts of forceps 1. Of the two directions orthogonal 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 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 front-rear direction of the sheath 2 may be referred to as a longitudinal direction. FIG. 2 is a side view of the forceps 1 as viewed from the left side.

In this embodiment, the sheath 2 extends linearly along a central axis 101 extending in the anteroposterior direction. Sheath 2 has a distal end 21 and a proximal end 22. Hereinafter, the terms distal end and proximal end should be understood not only to refer to the end points but also to the region including the end points and their neighboring regions. 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 holding portion 6 of the forceps 1, and FIG. 5 is a cross-sectional view of FIG. 4 cut along the line AA and viewed in the direction of the arrow. The sandwiching 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 grip an object.

The sandwiching portion 6 has a lower sandwiching piece 61 and an upper sandwiching piece 62. In this embodiment, the lower holding piece 61 is provided integrally with the sheath 2 and does not swing with respect to the sheath 2. The upper holding piece 62 is provided with two holes extending in the left-right direction, a 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 arranged in the hollow portion 23 of the sheath 2. The shaft receiving portion 67 has a groove portion that opens on the proximal side (rear side), and the shaft 3 is received by this groove portion. 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 holding 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 holding piece 62 and the shaft receiving portion 67, respectively, with the pins 64 and 66 as rotation axes.

When the shaft receiving portion 67 is moved to the proximal side (rearward) via the shaft 3, the linear motion of the shaft receiving portion 67 is converted into the rotational motion of the upper holding piece 62 by the link 65, and the upper holding piece 62 is on the lower side. The pinching portion 6 closes by rotating toward the pinching 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 cup portions 611 and 621 have an outer edge portion defined by a smooth curve, and are suitable for gripping an object or the like.

The sheath 2 may be made of any material, for example metal, the surface of which may be coated with a fluororesin. 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 also 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 shown to be the left-right direction, but the present invention is not limited to this, and the width direction may be 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 holding portion 6 via the shaft receiving portion 67. The 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. The 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, 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 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 ring portions 41 and 51 provided with finger hook holes, respectively. The 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 for weight reduction.

The front handle 4 and the rear handle 5 each 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 is composed of a pair of holding portions 421 and 422 that sandwich the pin receiving portion 52 of the rear handle 5 from the 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 base end of the pin 7, and a male screw is provided at the tip of the pin 7. A female screw is provided in the hole of one of the holding portions 422. The male screw provided at the tip of the pin 7 meshes with the female screw provided in the hole of the holding portion 422. On the other hand, the pin 7 is loosely fitted into a hole provided in one of the holding portions 421 of the front handle 4 and the pin receiving portion 52 of the rear handle 5.

In this way, the rear handle 5 is rotatably (or swingably) connected to the front handle 4 with respect 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 a forward rotation (clockwise rotation in FIG. 2), and the rotation of the rear handle 5 in a direction away from the front handle 4 is a backward rotation (rotation in the rear direction). In FIG. 2, it is referred to as counterclockwise rotation). The rotation axis of the rear handle 5 extending in the left-right direction is composed of pins 7.

In the pin receiving portions 42 and 52 of the front handle 4 and the rear handle 5, when the front handle 4 and the rear handle 5 are opened by a predetermined angle or more, the pin receiving portion 52 of the rear handle 5 becomes the pin receiving portion 42 of the front handle 4. It has a shape that abuts on and restricts further rotation.

A sheath receiving portion 43 for supporting a portion on the proximal side 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. The 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 at the proximal end 32 of the shaft 3, and its diameter is larger 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 accordance with the rotation of the rear handle 5. Specifically, when the rear handle 5 rotates forward, the shaft 3 interlocks and moves to the proximal side (rear). At this time, the shaft receiving portion 67 to which the distal end 31 of the shaft 3 is fixed also moves to the proximal side (rear), and the holding portion 6 closes. In this way, when the rear handle 5 rotates forward, the holding portion 6 closes. 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 holding portion 6 opens. In this way, when the rear handle 5 rotates backward, the holding portion 6 opens.

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 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. The stopper 8 has a function of restricting further forward rotation of the rear handle 5 by contacting the front handle 4 and the rear handle 5 when the rear handle 5 is rotated forward until the holding portion 6 is closed. Have. This makes it possible to prevent the handles 4 and 5 from being damaged due to excessive gripping.

In this embodiment, the stopper 8 has two regulatory members 81, 82 separated from each other. The number of regulating members is not limited to this, and one or more may be provided. The regulating members 81 and 82 have a cylindrical shape. The distal side (front side) regulating 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 side (rear side) regulating member 82 is fixed to the rear handle 5. By providing the regulating members 81 and 82, the grips of the handles 4 and 5 are stable. If the regulating member 81 is fixed to the regulating member 82, the coil spring 9 bends on the front handle 4 side, and if the regulating member 81 is fixed to the front handle 4, it is difficult to install the coil spring 9. become. Therefore, the regulating member 81 is configured to be slidable along the peripheral 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 a 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. Functions 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 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 a stopper 8.

In this embodiment, the coil spring 9 has a natural length when the holding portion 6 is slightly closed from a completely open state. In another embodiment, the coil spring 9 may have a natural length with the sandwiching portion 6 fully open.

The front handle 4 is provided with a groove 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 coil spring 9 is inserted into the hollow portion of the regulating member 82 on the rear end side, and the hollow portion communicates with the groove portion provided in the rear handle 5. The (opposing) surfaces 46, 55 of the front handle 4 and the rear handle 5 provided with the groove for the coil spring 9 are flat.

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, or stainless steel.

FIG. 7 is a side view showing the forceps 1 in a state where the holding portion 6 is closed. As described above, when the rear handle 5 is rotated forward until the holding portion 6 is closed, the restricting 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 from the state of FIG. 2 in which the holding portion 6 is open to the state of FIG. 7 in which the holding portion 6 is closed. Here, if the size of the portion of the object to be gripped is larger than the maximum opening angle of the sandwiching portion 6, the sandwiching portion 6 cannot grip the portion well, so that the rear handle 5 does not rotate and the user Does not receive elastic force from the coil spring 9. In this case, the user can change the part of the object to be grasped. As described above, the provision of the coil spring 9 has an effect that the user can appropriately select the pinching target (target portion) by the pinching portion 6. However, in the present invention, it should be understood that the repulsive force generating member 9 is selectively provided.

When the stopper 8 comes into contact with the front handle 4 and the rear handle 5 as a whole, the greater the distance from the ring portions 41, 51 operated by the user on the front handle 4 and the rear handle 5 to the stopper 8, the more the stopper is used as a fulcrum. The bending moment applied to the pair of handles 4 and 5 increases with the portion gripped by the user as the point of action, and the pair of handles 4 and 5 bends accordingly. Through this bending, the user can obtain the feeling that the object is firmly grasped by the holding portion 6. Since the front handle 4 and the rear handle 5 are made of resin, the bending 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 invention is limited to the content of the embodiments described above. In addition, other embodiments may be configured by freely combining the features described in the above-described embodiments. In addition, various improvements, design changes and deletions may be added to the above-described embodiments.

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 so as to be separated from each other in the vertical direction.

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

Further, in the above-described embodiment, the sheath 2 extending linearly from the distal end 21 to the proximal end 22 is provided. In another embodiment, as shown in FIG. 10, the distal region including the distal end 21 provided with the pinch 6 may be bent with respect 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 linearly extending from the distal end 21, and the first and second portions. It has a bent portion 203 to be connected with. 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 oriented in a desired direction in the body cavity to more preferably grip the living tissue. In this embodiment, the proximal portion of the sheath 2 may be supported by the sheath receiving portion 43 so that it can rotate with respect to the sheath receiving portion 43. The bent portion 203 is elastically deformed in the outer tube and extends substantially linearly, and bends when it passes through the outer tube and enters the human body.

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

FIG. 12 is a partially enlarged view of the bent portion 203 of the forceps 1 shown in FIG. The bent portion 203 is provided with five slits 210 formed by cutting the sheath 2. The slit 210 has a straight portion 204 in which the sheath 2 is cut in a straight line, and a circular portion 205 provided at the end of the cut. In FIG. 12, the number of slits 210 is set to 5, but the number is not limited to this. Further, in FIG. 12, the bending angle of the sheath 2 is set to 20 °, but the present invention is not limited to this. Further, in FIG. 12, the diameter of the circular portion 205 is set to 0.4 mm, but the diameter is not limited to this.

In FIG. 12, the slit 210 is provided on the side of the bent portion 203 where the sheath 2 bends (upper side in FIG. 12), and when the bent portion 203 is bent, the width of the slit 210 becomes narrow and the bending is easy. To. 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 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 the forceps 1 before bending the bending portion 203. 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 where 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. The dimensions and angles described here are examples, and can be appropriately selected depending on the bending angle and the flexibility of the sheath.

Further, as shown in FIG. 14, in the forceps 1 provided with 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 bent 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 bending the curved portion 203.

As shown in FIG. 16, before the sheath 2 is curved, the notch ends (lower part in FIG. 16) of the two slits 220 on the distal side of the total of five slits 220 are inclined to the distal side. The notch ends of the three slits 220 on the proximal side are inclined toward the proximal side. This facilitates the curvature of the sheath 2. It is preferable that the number of slits 220 whose cut end is inclined to the proximal side is larger than the number of slits 220 whose cut 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 curved, the slit 220 may be narrowed and the opening may be closed on the upper side (upper side of FIG. 15) of the slit 220.

As shown in FIG. 17, of the five slits 220, the slit 220b and the slit 220c, and the slit 220a and the slit 220d have shapes symmetrical with respect to the 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 respect to the torque centered on the axis c is obtained. Strength is improved.

FIG. 18 is 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 (a) cut along the EE line and indicated by arrows. It is a cross-sectional view when viewed in a direction. As described above, in the embodiment of the present invention, the shaft 3 has an elongated flat plate shape, but other than that, a cylindrical shape or the like may be used. However, as shown in FIG. 18, the bent portion of the sheath 2 is used. Only the portion 3b through which 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 may be inserted may have a cylindrical shape.

In this way, by forming the portion 3b through which the bent portion 203 of the shaft 3 is inserted into a flat plate shape having a rectangular cross section, the strength felt by the user when the rear handle 5 is gripped and operated while increasing the strength of the shaft 3 is increased. The feeling can be reduced.

Further, 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 ferromagnet 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. That is, the regulating members 81 and 82 not only function as the stopper 8, but also function as the repulsive force generating member. 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 the processing portion such as the holding portion, the presence / absence of the bent portion, and the type of the sheath such as the angle. FIG. 19 shows an example in which the color of the rear handle is changed according to the type of forceps. FIG. 19A is a gripping forceps whose processing unit has a gripping function, and FIG. 19B is a cutting forceps whose processing unit has a cutting function. c) is a bending forceps in which the grasping forceps have a bending portion, and the colors of 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 the forceps from being mistaken during work. Although the overall color of the rear handle is changed here, the color of the front handle and the colors of both the front handle and the rear handle may be changed. Further, if the operator can recognize the difference between the forceps, only a part of the color may be changed.

1 Forceps 2 Sheath 21 (Sheath) Distal end 22 (Sheath) Proximal end 23 (Sheath) Hollow part 3 Shaft 31 (Shaft) Distal end 32 (Shaft) Proximal end 4 Front handle 5 Rear Handle 41,51 Ring part 6,26 Holding part 7 Pin 8 Stopper 81, 82 Regulatory member 9 Repulsive force generating member (coil spring)
101 Central axis 201 (sheath) 1st part 202 (sheath) 2nd part 203 (sheath) bend 210, 220 Slit 263 Cut part

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 that supports the proximal end of the sheath, and a proximal rear handle that is rotatably connected 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 holding portion and the other end connected to the rear handle, and moves in the longitudinal direction in accordance with the rotation of the rear handle. A shaft configured to open and close the holding portion is provided.
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 a direction approaching the front handle until the sandwiching portion is closed, the front handle is further in a direction approaching the rear handle. There is a stopper configured to regulate rotation,
The forceps according to claim 1. Between the front handle and the rear handle, a repulsive force generating member that exerts 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 further provided. It is provided,
The forceps according to claim 2. The stopper has a hollow portion and has a hollow portion.
The repulsive force generating member is inserted into the hollow portion of the stopper.
The forceps according to claim 3. The stopper has one or more regulatory members and
At least one of the one or more regulatory members is configured to be slidable along the repulsive force generating member.
The forceps according to claim 4. The sandwiching portion is provided with a cutting piece for gripping and cutting the object.
The forceps according to any one of claims 1 to 5. 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 to 6. The sheath is
The first part extending straight from the proximal end and
A second part extending straight from the distal end,
It has a bent portion that bends and connects the first portion and the second portion.
The bent portion has a slit cut in the sheath.
The forceps according to any one of claims 1 to 6. The slit includes a slit on the proximal end side and a slit on the distal end side.
The slit on the proximal end side is cut so as to be inclined 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 toward the distal end. Notched,
The 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.
The forceps according to claim 9. The slit includes a portion parallel to the longitudinal direction of the sheath.
The 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.
The forceps according to any one of claims 8 to 11. The shaft has a flat plate shape at a portion through which the bent portion is inserted and a cylindrical shape at other portions.
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 portion provided at the distal end for opening and closing to process an object.
A distal front handle that supports the proximal end of the sheath, and a proximal rear handle that is rotatably connected 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 processing 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 operate the processing unit is provided.
The front handle and the rear handle are made of resin.
The rear handle was colored in a predetermined color according to the function of the processing unit and / also the shape of the sheath.
forceps.

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