CN201150526Y - Treating apparatus for endoscope - Google Patents

Abstract

The utility model provides a processing apparatus for an endoscope, which can simultaneously improve the rotary operability and the action of a removable front end portion, thereby trying for a simplified hand operation technique. The processing apparatus for an endoscope comprises a removable front end portion (5) for processing an organism, a first coil sheath (6) with flexibility, which is formed by a wire rod (6a) which is winded in helical shape, a second coil sheath (7) with flexibility, which is formed by a plurality of wire rods (7a) which are winded in helical shape along the same direction, and is coaxially sleeved out of the first coil sheath (6) with the first coil sheath (6), or is mounted in the first coil sheath (6), an operating line (8) with flexibility, which is extended to form in slenderness, and the front end of the operating line (8) is connected with the removable front end portion (5), the operating line penetrates through the first coil sheath (6) and moves relative to the first coil sheath (6), and an operation portion which is used to control the operating line (8) to drive and reverse, the front end of the second coil sheath (7) is fixed on the removable front end portion (5), and the basal end is fixed on the operation portion.

Description

Endoscope Treatment Instruments

technical field

The utility model relates to a treatment tool for an endoscope.

Background technique

Endoscopic treatment instruments such as grasping forceps used together with a flexible endoscope have a coil sheath wound with a wire, and are inserted into a body cavity through a treatment instrument passage of the endoscope. In order to rotate the distal end portion of the treatment tool for endoscope around the axis in this state, the operation portion on the hand side of the treatment tool for endoscope is usually rotated. Therefore, in order to improve the rotational followability of the movable tip portion, it is known to arrange a multi-strand wire coil sheath with high rotation transmission property as the coil sheath.

Here, when operating a treatment instrument such as forceps, which is opened and closed by pulling an operation wire from the operation part, compressive force acts in the axial direction of the coil sheath accompanying the opening and closing of the forceps pieces. At this time, the multi-strand coil sheath wound by a plurality of wires is more easily compressed in the axial direction than the single-strand coil sheath wound by one wire, although the rotation transmission property is higher. Therefore, the coil sheath is compressed in the axial direction, thereby reducing the axial force that should be transmitted to the front end portion, and sufficient handling cannot be performed, which makes the hand-operated technique cumbersome. Therefore, a treatment tool for an endoscope provided with a multilayered single wire coil sheath has been proposed (for example, refer to Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2000-229084

However, since the treatment instrument for endoscope described in the above-mentioned Patent Document 1 has a single-wire coil sheath, although the coil sheath has excellent axial compression resistance, its rotation transmission performance is still not good enough.

Utility model content

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a treatment tool for endoscope that can simultaneously improve the rotational operability and operability of the movable distal end portion, thereby simplifying the manual operation technique.

In order to solve the above-mentioned problems, the utility model adopts the following technical solutions.

The treatment tool for endoscope of the present utility model is characterized in that it has: a movable front end for treating a living body; a flexible first coil sheath, which is helically wound by a wire formed; a flexible second coil sheath, which is formed by helically winding a plurality of wires in the same direction, and coaxially with the above-mentioned first coil sheath outside the first coil sheath, or inside In the first coil sheath; a flexible operating wire is elongated and formed, and the front end is connected to the movable front end, the operating wire passes through the first coil sheath, and can be opposed to Move on the first coil sheath; the operation part is used for advancing and retreating the operation wire; the front end of the second coil sheath is fixed to the movable front end, and the base end of the second coil sheath It is fixed on the above operation part.

In the utility model, in order to operate the movable front end part, when the operation part is advanced and retreated, and the operation wire is moved in the axial direction relative to the first coil sheath, even if the second coil sheath with the front end and the base end fixed is affected The compressive force can also be used to ease the compression of the second coil sheath by using the first coil sheath that is helically wound by a wire with high compression resistance, so that sufficient operating force can be better transmitted to the Movable front end. In addition, the second coil sheath, which is formed by helically winding a plurality of wires in the same direction and has high rotation transmission performance, is less likely to be twisted than the first coil sheath. Even when the first coil sheath is twisted, high rotation follow-up performance can be obtained when the inner part is rotated. Furthermore, since the outer diameter of the second coil sheath is larger than the outer diameter of the first coil sheath, the torque transmission performance of the second coil sheath can be further improved.

In addition, the endoscope treatment tool of the present invention is the above-mentioned treatment tool for endoscope, characterized in that the front end of the first coil sheath is connected to the movable front end portion and can be moved relative to the movable front end. The base end of the first coil sheath is connected to the operation part and can freely rotate relative to the operation part.

Since the utility model configures the first coil sheath to be freely rotatable relative to the second coil sheath, when the movable front end is rotated by rotating the operating part around the central axis of the coil sheath, even the second coil sheath The twisting of the sleeve can also suppress the twisting of the first coil sheath. Therefore, high rotational transferability can be maintained.

Furthermore, the treatment instrument for endoscope of the present invention is the above-mentioned treatment instrument for endoscope, wherein at least one of the wire material of the first coil sheath and the wire material of the second coil sheath has a substantially rectangular cross section. .

When the utility model compares a coil sheath formed by a wire with a substantially circular cross-section and a coil sheath formed by a wire with a substantially rectangular cross-section, if the cross-sectional areas of the wires are the same, if the outer diameter of the coil sheath If they are the same, the inner diameter of the coil sheath can be changed by adjusting the width and height dimensions of the roughly rectangular cross-section wire; Dimensions, the outer diameter of the coil sheath can be changed. For example, the outer diameter of a coil sheath wound with a substantially rectangular cross-section wire can be made smaller than that of a coil sheath wound with a substantially circular cross-section wire, or a coil sheath wound with a substantially rectangular cross-section wire can be made The inner diameter of the coil sheath is larger than the inner diameter of the coil sheath wound from a substantially circular cross-section wire.

Furthermore, the treatment instrument for endoscope of the present invention is the treatment instrument for endoscope described above, wherein the winding direction of the first coil sheath wire and the winding direction of the second coil sheath wire are the same direction.

In the utility model, when the winding direction of the wire rod is the same as the direction in which the entire coil sheath rotates around the axis, the coil sheath will be subjected to a turning force along the axial direction of the wire rod, so the coil sheath can be rotated with less torsion.

In addition, the treatment tool for endoscope of the present invention is the above-mentioned treatment tool for endoscope, characterized in that the winding direction of the first coil sheath wire and the winding direction of the second coil sheath wire are opposite to each other. .

Since the utility model rotates the entire coil sheath around the axis in any direction, it will be affected by the turning force along the winding direction of the wire wound in a direction close to the above-mentioned rotation direction, so the entire coil sheath can be rotated with less torsion. set.

By adopting the utility model, the rotational operability and actionability of the movable front end portion can be improved simultaneously, thereby simplifying the manual operation technique.

Description of drawings

FIG. 1 is a cross-sectional view showing the distal end side of forceps for an endoscope according to a first embodiment of the present invention.

Fig. 2 is a sectional view of II-II in Fig. 1 .

3 is a cross-sectional view showing the proximal end side of the endoscopic forceps according to the first embodiment of the present invention.

4 is a partially cutaway cross-sectional view showing the operating portion of the endoscopic forceps according to the first embodiment of the present invention.

5 is a cross-sectional view showing the distal end side of the endoscopic forceps according to the second embodiment of the present invention.

6 is a cross-sectional view showing the distal end side of the endoscopic forceps according to the third embodiment of the present invention.

7 is a cross-sectional view showing a modification example of the endoscopic forceps according to the third embodiment of the present invention, on the front end side.

8 is a cross-sectional view showing a modification example of the endoscopic forceps according to the third embodiment of the present invention, on the front end side.

9 is a schematic diagram showing a first coil sheath and a second coil sheath of an endoscopic forceps according to a fourth embodiment of the present invention.

10 is a cross-sectional view showing a modification example of the endoscopic forceps according to the first embodiment of the present invention, on the front end side.

Detailed ways

A first embodiment of the present invention will be described with reference to FIGS. 1 to 4 .

The endoscopic forceps (endoscopic treatment instrument) 1 of the present embodiment has: a movable front end portion 5 for treating a living body, which has a pair of forceps pieces 2A, 2B and a front end cover 3; a flexible first coil sheath 6, which is formed by helically winding one wire 6a; a flexible second coil sheath 7, which is formed by helically winding a plurality of wires 7a in the same direction, and Coaxially with the first coil sheath 6 and outside the first coil sheath 6; a flexible operating wire 8 is elongated and formed, and the front end is connected to the movable front end portion 5. The operating wire 8 It passes through the first coil sheath 6 and is movable relative to the first coil sheath 6 ; the operating part 10 is used for advancing and retreating the operating wire 8 .

The front end cover 3 is formed in a substantially cylindrical shape, and a rotatable pivot shaft 11 is provided at the front end thereof, and the pivot shaft 11 supports the pair of forceps pieces 2A, 2B so as to be rotatable with each other. A step 3 a is provided on the inner peripheral surface of the proximal end side of the front end cover 3 , and the front ends of the first coil sheath 6 and the second coil sheath 7 are respectively fitted into the step 3 a.

The operation unit 10 has a rod-shaped operation unit main body 12 extending in the direction of the central axis C, and a slide member 13 disposed so as to be able to move forward and backward freely in the direction of the central axis C with respect to the operation unit main body 12 . A slit 12A through which the operation wire 8 passes is provided in the operation portion main body 12 in the central axis C direction. In addition, a protruding portion 12B is provided on the distal end side of the operation portion main body 12 , and base ends of the first coil sheath 6 and the second coil sheath 7 are respectively connected to the inner peripheral surfaces of the protruding portion 12B. A through hole 12 a communicating with the slit 12A is provided in the protruding portion 12B. The outer side of the protruding portion 12B is covered with a breakage preventing portion 15 for protecting the connecting portion between the protruding portion 12B and the first coil sheath 6 and the second coil sheath 7 .

The front end side of the first coil sheath 6 is connected and fixed to the front end cover 3, and the proximal end of the first coil sheath 6 is fitted into the inner peripheral surface of the through hole 12a of the protrusion 12B of the operation part main body 12 to be fixed. Since the first coil sheath 6 is a single wire coil formed by helically winding one wire 6a, it is not easily deformed even if it is compressed in the direction of the central axis C, and has compression resistance. The wire 6a is made of stainless steel, for example, and is formed in a substantially circular cross section.

The second coil sheath 7 is connected and fixed to the front end cover 3 in a state in which a part of the wire 7a is cut off on the outer peripheral surface on the front end side, and the base end of the second coil sheath 7 is connected to the base end of the operation part main body 12. The inner peripheral surface of the through-hole 12a of the protruding part 12B is fitted and fixed. Since the second coil sheath 7 is a multi-strand coil formed by helically winding a plurality of wires 7a, the torque around the central axis C is easily transmitted. The wire 7 a is made of, for example, stainless steel, has a substantially circular cross section, and is wound in the same direction as the first coil sheath 6 is wound.

The front end side of the second coil sheath 7 is fitted into the connection member 18 , and the front end of the insulating tube 17 is fitted over the connection member 18 . At the proximal end of the insulating tube 17, there is provided a tube-side engaging convex portion 17A, which is rotatably engaged with an operating portion-side engaging concave portion 12C provided on the protruding portion 12B of the operating portion main body 12. Snap.

The operation wire 8 includes a first operation wire 8A rotatably connected to the base end of the forceps piece 2A, and a second operation wire 8B rotatably connected to the base end of the forceps piece 2B. In addition, the operation wires 8A, 8B are arranged to pass through the through hole 12 a of the operation part main body 12 , and the base ends of the operation wires 8A, 8B pass through the slit 12A and are connected to the slide member 13 . The front end sides of the first operation wire 8A and the second operation wire 8B are bent away from the central axis C. As shown in FIG.

Next, the action of the endoscopic forceps 1 of this embodiment will be described.

Endoscopic forceps 1 are inserted into a channel of an endoscope treatment instrument (not shown) previously inserted into a body cavity, and the movable distal end portion 5 protrudes from the distal end of the endoscope to perform predetermined treatment.

At this time, if the opening and closing direction of the pair of forceps pieces 2A, 2B is different from the direction in which an unshown affected part should be grasped, it is necessary to adjust the forceps 1 for endoscope so that the two directions are consistent. Therefore, holding the insulating tube 17 and rotating the operation part 10 around the central axis C, the opening and closing directions of the pair of forceps pieces 2A and 2B coincide with the direction in which the affected part should be grasped.

At this time, the second coil sheath 7 has the above-mentioned structure. Therefore, when the operation part 10 is rotated at a predetermined angle, torque is transmitted to the second coil sheath 7 in a state of following the rotated angle. And this torque is further transmitted to the movable front end part 5, and the movable front end part 5 rotates around the central axis C by a predetermined angle. In addition, at this time, the first coil sheath 6 also rotates accordingly.

When the opening and closing direction of the pair of pliers pieces 2A, 2B coincides with the direction to be grasped, the sliding member 13 is moved toward the front end side relative to the operation part main body 12, so that the operation wire 8 is relatively opposite to the first coil sheath 6 and the second coil sheath 6. The coil sheath 7 moves toward the front end side. At this time, the front end sides of the first operation wire 8A and the second operation wire 8B are separated from the central axis C. As shown in FIG. Therefore, the pair of forceps pieces 2A, 2B rotate around the pivot shaft 11, and the pair of forceps pieces 2A, 2B are opened.

In this state, the slide member 13 is moved toward the proximal side with respect to the operation part main body 12 , and the operation wire 8 is moved toward the proximal side with respect to the first coil sheath 6 and the second coil sheath 7 . At this time, since the front end and base end of the first coil sheath 6 and the second coil sheath 7 are fixed respectively, as the operation wire 8 moves, the first coil sheath 6 and the second coil sheath 7 are aligned with the central axis. C direction is compressed.

Here, since the first coil sheath 6 has the above structure, even if the second coil sheath 7 is to be compressed more than necessary, the compression resistance of the first coil sheath 6 cannot be compressed. The second coil sheath 7 is compressed more than necessary. Therefore, the compressive action of the axial force on the first coil sheath 6 and the second coil sheath 7 caused by the movement of the operation wire 8 relative to the first coil sheath 6 and the second coil sheath 7 is suppressed, thereby This axial force is transmitted to the pair of forceps pieces 2A, 2B. In this way, the pair of forceps pieces 2A, 2B are respectively rotated and closed around the pivot shaft 11, thereby gripping the affected part with the required gripping force.

According to this endoscopic forceps 1, in order to operate the movable distal end portion 5, the slide member 13 of the operation portion 10 is operated to move forward and backward relative to the operation portion main body 12, so that the operation wire 8 moves forward and backward relative to the first coil sheath. 6 moves in the axial direction. At this time, even if the second coil sheath 7 with its distal end and base end fixed is subjected to a compressive force, it can be closed by the first coil sheath 6 having high compression resistance formed by helically winding one wire 6a. Compression of the second coil sheath 7 is eased, preferably transmitting sufficient operating force to the movable front end portion 5 .

In addition, the second coil sheath 7 having high rotation transmissibility, in which a plurality of wires 7a are helically wound in the same direction, is less likely to be twisted than the first coil sheath 6 . Therefore, even if the first coil sheath 6 is twisted when the movable tip portion 5 is rotated by rotating the operating portion 10 around the central axis C, high rotation following performance can be obtained. Furthermore, since the outer diameter of the second coil sheath 7 is larger than the outer diameter of the first coil sheath 6, the torque transmission performance of the second coil sheath 7 can be further improved. Therefore, the rotational operability and operability of the movable front end portion 5 can be improved at the same time, and the manual operation technique can be simplified.

Next, a second embodiment will be described with reference to FIG. 5 .

In addition, the same code|symbol is attached|subjected to the same component as the said 1st Embodiment, and the description is abbreviate|omitted.

The difference between the second embodiment and the first embodiment is that the front end of the first coil sheath 6 of the endoscopic forceps 20 of this embodiment is connected to the front end cover 3 of the movable front end part 5 and can be moved relative to The front end cover 3 is rotatable, and the proximal end of the first coil sheath 6 is connected to the protruding part 12B of the operation part main body 12 of the operation part 10 and is rotatable relative to the protruding part 12B.

The action of the endoscopic forceps 20 will be described.

When the opening and closing direction of the pair of forceps pieces 2A, 2B is different from the direction in which an unshown affected part should be grasped, it is necessary to adjust the forceps 20 for endoscope so that the two directions coincide. Therefore, as in the first embodiment, the insulating tube 17 is grasped, and the operation part 10 is rotated around the central axis C so that the opening and closing directions of the pair of forceps pieces 2A, 2B coincide with the direction in which the affected part should be grasped.

At this time, when the operation part 10 is rotated by a predetermined angle with respect to the insulating tube 17 , the second coil sheath 7 is rotated by a predetermined angle around the central axis C together with the movable tip part 5 and the operation part 10 . On the other hand, since the first coil sheath 6 does not rotate together with the movable front end portion 5 , the second coil sheath 7 relatively rotates with respect to the first coil sheath 6 .

In this way, after the opening and closing direction of the pair of forceps pieces 2A, 2B is aligned with the direction to be grasped, the pair of forceps pieces 2A, 2B is opened and closed by the same operation as in the first embodiment.

With this endoscopic forceps 20, since the first coil sheath 6 and the second coil sheath 7 are relatively rotated, the discontinuous rotation due to the second coil sheath 7 can be preferably suppressed. It is generated by the repeated accumulation and release of the strain caused by the difference in rotation angle between the sheath 7 and the first coil sheath 6 .

Next, a third embodiment will be described with reference to FIG. 6 .

In addition, the same code|symbol is attached|subjected to the same component as the above-mentioned other embodiment, and description is abbreviate|omitted.

The third embodiment differs from the first embodiment in that the wire 31a of the second coil sheath 31 of the endoscopic forceps 30 of this embodiment has a substantially rectangular cross section.

Using this forceps 30 for an endoscope, the second coil sheath 7 formed of the wire material 7a having a substantially circular cross section and the second coil sheath 31 formed of the wire material 31a having a substantially rectangular cross section in the first embodiment were compared. , when the cross-sectional areas of the wires are the same, assuming that the outer diameters of the coil sheaths are the same, by adjusting the dimensions in the width direction and the height direction of the wires 31a with a roughly rectangular cross-section, it is possible to wind the coils formed by winding the wires 31a with a roughly rectangular cross-section. The inner diameter of the second coil sheath 31 is smaller or larger than the inner diameter of the second coil sheath 7 formed by winding the wire 7a having a substantially circular cross section.

In addition, when the coil sheath diameters of the above two coil sheaths and their wire sectional areas are the same as each other, since the widthwise dimension of the substantially rectangular cross-section wire 31a is larger than that of the substantially circular cross-section wire 7a, the widthwise dimension is somewhat different. Increase, therefore, can improve the rigidity of the coil sheath.

Alternatively, as shown in FIG. 7 , endoscopic forceps 33 may be used in which the wires 32 a of the first coil sheath 32 have a substantially rectangular cross section instead of the wire rods of the second coil sheath 31 having a substantially rectangular cross section. In addition, as shown in FIG. 8 , endoscopic forceps 35 may be used in which both the wire 32 a of the first coil sheath 32 and the wire 31 a of the second coil sheath 31 have substantially rectangular cross-sections. In either case, the same effects as those of the present embodiment can be achieved.

Next, a fourth embodiment will be described with reference to FIG. 9 .

In addition, the same code|symbol is attached|subjected to the same component as the above-mentioned other embodiment, and description is abbreviate|omitted.

The fourth embodiment is different from the first embodiment in that the winding direction of the wire 41a of the first coil sheath 41 and the winding direction of the wire 42a of the second coil sheath 42 of the endoscopic forceps 40 of this embodiment are The directions are opposite to each other with respect to the central axis C.

That is, for example, when the wire material 41a of the first coil sheath 41 is wound counterclockwise with respect to the central axis C, the wire material 42a of the second coil sheath 42 is wound clockwise.

According to this endoscope pliers 40, since the entire coil sheath is rotated around the axis in any direction, a turning force will be applied in the winding direction of the wire wound in a direction close to the above-mentioned rotation direction, so it can be twisted with less twisting. The state rotates the entire coil sheath.

In addition, the technical scope of this invention is not limited to the said embodiment, Various changes are possible in the range which does not deviate from the summary of this invention.

For example, in the above-mentioned embodiment, the first coil sheath 6 is disposed inside the second coil sheath 7, 31, but the invention is not limited to this, and endoscopic forceps as shown in FIG. 10 may be used. 53, the forceps 53 for endoscope is that the second coil sheath 51 is disposed inside the first coil sheath 50 covered with the insulating tube 17 on the outer surface, and the second coil sheath 51 can be relative to the first coil sheath 50. One coil sheath 50 is free to rotate, only the front end of the second coil sheath 51 is fixed on the front end cover 52 , and the operating wire 8 is arranged to move forward and backward freely relative to the second coil sheath 51 .

At this time, when the insulating tube 17 is grasped and the operation part (not shown) is rotated about the central axis C, the second coil sheath 51 is rotated relative to the first coil sheath 50 . At this time, since the inner peripheral surface of the first coil sheath 50 and the outer peripheral surface of the second coil sheath 51 are stainless steel surfaces, the frictional force generated by the relative rotation of the sheath can be suppressed low, thereby Allows the sheath to rotate smoothly.

Furthermore, in the above-described embodiment, a part of the contact surface between the first coil sheath and the second coil sheath may be bonded by laser welding or the like. At this time, since the overlapping coil sheaths in the radial direction rotate integrally, strain is not accumulated and released between the sheaths. Therefore, the sheath can be rotated smoothly.

Claims (5)

1. endoscope treatment tool is characterized in that it has:

Be used for movable frontal end area that organism is handled;

Have flexible first coil jackets, its by 1 wire rod in the shape of a spiral shape be entwined;

Have flexible second coil jackets, its by many wire rods along same direction in the shape of a spiral shape be entwined, and be coated at coaxially on first coil jackets with above-mentioned first coil jackets or in be loaded in first coil jackets;

Have flexible operating line, it slenderly extends to form and front end is connected with above-mentioned movable frontal end area, and this operating line passes from above-mentioned first coil jackets and can move with respect to above-mentioned first coil jackets;

Operating portion, it is used for the operation of advancing and retreat of this operating line;

The front end of above-mentioned second coil jackets is fixed in above-mentioned movable frontal end area, and the cardinal extremity of above-mentioned second coil jackets is fixed in aforesaid operations portion.

2. endoscope treatment tool according to claim 1, it is characterized in that, the front end of above-mentioned first coil jackets is connected with above-mentioned movable frontal end area and can rotates freely with respect to above-mentioned movable frontal end area, and the cardinal extremity of above-mentioned first coil jackets is connected with aforesaid operations portion and can rotates freely with respect to aforesaid operations portion.

3. endoscope treatment tool according to claim 1 and 2 is characterized in that, at least one side in the wire rod of the wire rod of above-mentioned first coil jackets and above-mentioned second coil jackets is the essentially rectangular cross section.

4. endoscope treatment tool according to claim 1 and 2 is characterized in that, the winding direction of the winding direction of the above-mentioned first coil jackets wire rod and the above-mentioned second coil jackets wire rod is same direction.

5. endoscope treatment tool according to claim 1 and 2 is characterized in that, the winding direction of the winding direction of the above-mentioned first coil jackets wire rod and the above-mentioned second coil jackets wire rod is rightabout each other.

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