Treatment tool for endoscope

Abstract

This treatment tool for an endoscope is provided with: a sheath; and a tip support member supported at the tip of the sheath. The tip support member includes: a pair of frame pieces; a rotating shaft extending in a direction orthogonal to an axial direction in which the pair of frame pieces extend, the rotating shaft connecting tip portions of the pair of frame pieces to each other; and a plate member having a through-hole that constitutes a bearing into which the rotating shaft is fitted, the plate member extending between the rotating shaft and the sheath, and being capable of sliding relative to the sheath by moving the rotating shaft toward the sheath.

Description

[0001] This case is filed on July 8, 2019 、Application No. 201980098262.7 、The name of the invention is For endoscope Disposal equipment A divisional application for a patent application. Technical Field

[0002] The present invention relates to an endoscope treatment instrument. Background Art

[0003] An endoscopic treatment instrument is known in which a pair of forceps cups as a distal treatment member of a biopsy forceps is openably and closably supported around a support shaft on a distal support member fixed to a distal end of a flexible sheath (see, for example, Patent Document 1).

[0004] The front end support component has a gap with a gap between them. A link mechanism for opening and closing the forceps cup is arranged in the gap. By moving the operating wire inserted in the flexible sheath forward and backward, the link mechanism can be driven to open and close the forceps cup in a mouth shape.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2002-58675 Summary of the invention

[0008] Technical problem to be solved by the invention

[0009] When collecting tissue, in order to make the edge of the forceps cup sink into the tissue, it is necessary to apply a large tension to the operating wire. When a large tension is applied to the operating wire, a large load is applied to the front end support component that supports the forceps cup. Therefore, it is desired that the front end support component has a high strength. However, when the strength of the front end support component is to be improved, problems such as reduced productivity due to an increase in manufacturing processes and difficulty in miniaturization of the front end support component will arise.

[0010] An object of the present invention is to provide an endoscopic treatment instrument that can improve strength with a simple structure.

[0011] Means for solving technical problems

[0012] One embodiment of the present invention is an endoscopic treatment instrument, characterized in that it includes: a sheath; a rotating shaft extending in an axial direction orthogonal to the longitudinal axis of the sheath; a pair of gripping parts swingably connected to the rotating shaft; an operating wire connected to the gripping parts; and a plate part having a bearing for embedding the rotating shaft and an abutment portion extending radially outward from the sheath, the plate part extending between the rotating shaft and the sheath.

[0013] In this method, when the operating wire is pulled in a closed state of a pair of grasping parts, the rotating shaft supporting the grasping parts can be pulled toward the root end side of the sheath by the tension transmitted by the operating wire, and the plate part arranged between the rotating shaft and the sheath is subjected to a compressive force in the longitudinal axial direction.

[0014] Therefore, the compressive force acting on the rotating shaft is received by the plate member, so that the compressive stress applied to each member can be reduced, and an endoscope treatment instrument having improved strength with a simple structure can be provided.

[0015] Furthermore, by fitting the rotating shaft into the bearing of the plate member, the plate member can be easily mounted between the rotating shaft and the sheath.

[0016] In the above-mentioned method, it may be that it also includes: a front end supporting component fixed to the front end of the sheath, which can support the grasping component in a manner that it can swing around the axis; and an operating part arranged at the root end of the sheath, the operating wire is inserted into the sheath in the direction of the longitudinal axis, connecting the grasping component with the operating part, and the operating wire can be moved forward and backward in the direction of the longitudinal axis by operation of the operating part to transmit the tension for swinging the grasping component, the front end supporting component includes a pair of frame pieces extending in the direction of the longitudinal axis and spaced apart in a direction orthogonal to the longitudinal axis, the rotating shaft extends in the direction of the axis and connects the front ends of the frame pieces to each other, and when tension acts on the operating wire, the plate part is subjected to compression force in the direction of the longitudinal axis.

[0017] With this structure, the operator can operate the operation part while checking the image acquired by the endoscope. Thus, the operation wire can be pulled toward the root end side in the longitudinal axis direction, and the tension can be transmitted to the pair of gripping members arranged at the front end of the sheath by the operation wire, so that the gripping members can swing around the axis of the rotation shaft. The tissue can be gripped by closing the gripping members in a state where the tissue is arranged between the pair of gripping members.

[0018] When the operator further pulls the operating wire using the operating part when the pair of gripping members are closed, the rotating shaft of the front end supporting member supporting the gripping member can be pulled toward the root end side of the sheath by the tension transmitted by the operating wire, so that the frame piece is subjected to a compressive force in the longitudinal axis direction. At this time, according to this mode, the plate member disposed between the rotating shaft and the sheath is subjected to a compressive force in the longitudinal axis direction.

[0019] Thus, the compressive force acting on the rotating shaft can be dispersedly borne by the pair of frame pieces and the plate member, so that the compressive stress applied to each member can be reduced and buckling of the frame piece can be prevented. That is, by increasing the strength with a simple structure without increasing the thickness of the frame piece or using a high-strength material, it is possible to suppress damage to the endoscope treatment instrument when operating the gripping member.

[0020] In the above aspect, when tension acts on the operation wire, the abutment portion may abut against an end surface of the sheath.

[0021] According to this configuration, when tension acts on the operation wire, the contact portion contacts the end surface of the sheath, and is sandwiched between the rotation shaft and the end surface of the sheath, thereby receiving a compressive force.

[0022] In the above aspect, the front end support member may include a fixing portion for fixing the pair of frame pieces to the sheath, and the fixing portion and the pair of frame pieces may be integrally formed by bending a metal thin plate.

[0023] With this structure, the fixing portion and a pair of frame pieces can be integrally formed by bending a metal thin plate, and the front end support component can be manufactured cheaply. By fixing the front end support component to the sheath by using the fixing portion, the pair of frame pieces can be extended from the end face of the sheath along the longitudinal axis.

[0024] In the above aspect, when tension acts on the operation wire, the contact portion may contact the fixing portion.

[0025] According to this configuration, when tension acts on the operation wire, the contact portion contacts the fixing portion, and the wire is sandwiched between the rotation shaft and the end surface of the sheath via the fixing portion, thereby receiving a compressive force.

[0026] In the above aspect, the plate member may include an insertion end portion extending in the longitudinal axis direction and capable of being inserted into the sheath.

[0027] According to this structure, by inserting the insertion end portion of the plate member into the sheath, it is possible to position the contact portion in the radial direction so that the contact portion does not deviate from the sheath or the fixing portion.

[0028] In the above aspect, the fixing portion may be formed into a cylindrical shape surrounding the radially outer side of the end face of the sheath, and when tension acts on the operation wire, the abutment portion abuts against the end face of the sheath radially inner side of the fixing portion.

[0029] With this structure, the cylindrical fixing portion surrounds the portion where the abutting portion abuts against the end surface of the sheath, thereby preventing the abutting portion from being exposed to the outside. Thus, tissue can be prevented from being sandwiched between the abutting portion and the end surface of the sheath.

[0030] In the above aspect, the plate member may include a needle-shaped portion extending between the pair of gripping members.

[0031] With this structure, the needle-shaped portion can be inserted and fixed in the tissue sandwiched between a pair of grasping members, so that the part to be collected can be grasped accurately. Moreover, by integrating such a needle-shaped portion with the plate member, the number of components can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is an overall structural diagram showing a state in which a pair of grasping members of an endoscopic treatment instrument according to an embodiment of the present invention are closed.

[0033] Figure 2 Yes means Figure 1 A partial longitudinal cross-sectional view of the front end portion of an endoscopic treatment instrument.

[0034] Figure 3 Yes means Figure 1 A partial side view of the front end portion of an endoscopic treatment instrument.

[0035] Figure 4 Yes means Figure 1 An overall structural diagram of an endoscopic treatment instrument with a pair of grasping parts in an open state.

[0036] Figure 5 Yes means Figure 4 A partial longitudinal cross-sectional view of the front end portion of an endoscopic treatment instrument.

[0037] Figure 6 Yes means Figure 1 A longitudinal cross-sectional view of a state in which a buckling prevention component of an endoscopic treatment instrument abuts against an end surface of a spring tube.

[0038] Figure 7 Yes means Figure 1 A partial longitudinal cross-sectional view of a modified example of an endoscopic treatment instrument.

[0039] Figure 8 Yes means Figure 1 A partial side view of another modified example of the endoscopic treatment instrument.

[0040] Fig. 9 Yes means Figure 1 A partial cross-sectional view of another modified example of the endoscopic treatment instrument.

[0041] Fig.10 Yes means Figure 1 A partial cross-sectional view of another modified example of the endoscopic treatment instrument.

[0042] Fig.11 Yes means Fig.10 A partial stereoscopic view of an endoscopic treatment instrument. DETAILED DESCRIPTION

[0043] Next, an endoscope treatment instrument 1 according to an embodiment of the present invention will be described with reference to the drawings.

[0044] like Figure 1 As shown, the endoscopic treatment instrument 1 of this embodiment includes: a spring tube (sheath) 2; a front end support component 3 fixed to the front end of the spring tube 2; a pair of grasping components 4a, 4b supported by the front end support component 3; an operating part 5 arranged at the root end of the spring tube 2; and an operating wire 6 connecting the operating part 5 to the grasping components 4a, 4b.

[0045] Reference numeral 7 in the figure is a resin coating tube covering the outer surface of the spring tube 2. The spring tube 2 is formed by tightly winding a steel wire such as stainless steel in a spiral shape. The spring tube 2 and the coating tube 7 have a certain outer diameter size that can be inserted into the channel of an endoscope not shown in the figure.

[0046] like Figure 2 and Figure 3 As shown, the front end support component 3 includes: a cylindrical fixing portion 8; a pair of frame pieces 9a, 9b extending from the front end of the fixing portion 8 and spaced apart from each other in radially opposite positions; a rotating shaft 10 extending in a direction orthogonal to the axial direction in which the frame pieces 9a, 9b extend and connecting the front end portions of the frame pieces 9a, 9b to each other; and an anti-buckling component 11.

[0047] The fixing portion 8 and the pair of frame pieces 9a, 9b of the front end support member 3 are integrally formed by punching and bending a metal thin plate by press working. The fixing portion 8 is formed into a cylindrical shape by bending a band-shaped portion so that the concave portion 12 and the convex portion 13 of complementary shapes at both ends engage in the circumferential direction.

[0048] The fixing portion 8 has an inner diameter substantially equal to the outer diameter of the spring tube 2 , is fitted with the spring tube 2 and disposed at a position surrounding the entire outer circumference of the end surface 2 a of the spring tube 2 , and is fixed to the spring tube 2 by welding or the like.

[0049] Each of the frame pieces 9 a and 9 b extends to a position closer to the distal end of the endoscopic treatment instrument 1 than the distal end of the spring tube 2 .

[0050] The cross-sectional shape of the portion of each frame piece 9a, 9b connected to the fixing portion 8 is formed in an arc shape. A through hole 14 through which the rotating shaft 10 passes is provided at the front end portion of each frame piece 9a, 9b.

[0051] like Figure 2As shown, the buckling prevention component 11 is composed of a plate-shaped metal thin plate (plate component) having a through hole 15 at one end for the rotating shaft 10 to pass through in the plate thickness direction. One end of the buckling prevention component 11 constitutes a bearing for the rotating shaft 10 to be embedded in the through hole 15. The other end of the buckling prevention component 11 has a width in a direction orthogonal to the longitudinal axis of each frame piece 9a, 9b and the central axis of the rotating shaft 10, and the width is slightly smaller than the inner diameter of the spring tube 2. The other end of the buckling prevention component 11 is provided with: an insertion end 16 that can be inserted into the spring tube 2; and an abutment portion (abutment surface) 17 that is formed to be wider than the insertion end 16 and can be arranged at a position that abuts against the end face 2a of the spring tube 2. That is, the abutment portion 17 extends radially outward of the spring tube 2.

[0052] In a state where no tension is applied to the operation wire 6 described later, Figure 2 As shown in the figure, the contact portion 17 is arranged with a small gap from the end face 2a of the spring tube 2 in the longitudinal axis A direction of the spring tube 2. Moreover, the contact portion 17 has a shape in which the width becomes narrower from the position extending outward in the width direction from both sides of the insertion end portion 16 toward the front end of the buckling prevention member 11. The maximum width of the contact portion 17 is slightly smaller than the inner diameter of the fixing portion 8.

[0053] like Figure 3 As shown, the gripping members 4a, 4b are formed, for example, by pressing a metal thin plate, into a shape having a through hole 21 in the center for the rotation shaft 10 to pass through, a cup-shaped gripping portion 18a, 18b at one end, and a mounting hole 19 at the other end for mounting the operation wire 6. In the figure, reference numerals 20a, 20b are holes provided in the gripping portions 18a, 18b for partially escaping the tissue.

[0054] When assembling the front end support component 3 and the pair of gripping components 4a, 4b, align the through holes 21 of the pair of gripping components 4a, 4b, the through holes 15 of the anti-buckling component 11, and the through holes 14 of the pair of frame pieces 9a, 9b, and insert the pair of gripping components 4a, 4b with the anti-buckling component 11 in between between the pair of frame pieces 9a, 9b. In this state, the rotating shaft 10 having a flange at one end is passed through the through holes 14, 15, 21 of the components 4a, 4b, 9a, 9b, 11 from one frame piece 9a side, and the other end of the rotating shaft 10 that has passed through the other frame piece 9b is riveted. Thus, as shown in FIG. Figure 3 As shown, a pair of gripping members 4a, 4b are mounted on the front end support member 3 in a mouth-like openable and closable manner. Alternatively, the rotating shaft 10 may be passed through the other frame piece 9b side and riveted after passing through one frame piece 9a.

[0055] The operating part 5 includes: a rod-shaped operating part body 23 mounted at the root end of the spring tube 2, a groove 22 formed in the length direction of the operating part body 23; and a slider 24 supported on the operating part body 23 in a manner that can slide along the groove 22. The operating part body 23 and the slider 24 are provided with a finger hook portion 25 for the operator to hook his finger.

[0056] exist Figures 1 to 3 In the illustrated example, the endoscopic treatment instrument 1 includes two operation wires 6. The root end of each operation wire 6 is connected to the slider 24, and the tip end of each operation wire 6 is connected to the mounting holes 19 of the pair of gripping members 4a and 4b.

[0057] Next, the operation of the endoscopic treatment instrument 1 of the present embodiment having the above-mentioned structure will be described.

[0058] When collecting tissue in the body using the endoscopic treatment instrument 1 of the present embodiment, the endoscopic treatment instrument 1 is inserted into the body through the channel of an endoscope inserted into the digestive tract.

[0059] The operator aligns the pair of gripping members 4a and 4b of the endoscope treatment instrument 1 with the position of the tissue to be collected while checking the image obtained by the endoscope. In this state, the slider 24 is moved forward along the groove 22 relative to the operation part body 23 of the operation part 5 toward the front end side of the operation part body 23. Figure 4 and Figure 5 As shown, the pair of gripping members 4a and 4b are pushed by the operation wire 6 to swing the pair of gripping members 4a and 4b around the rotation axis 10, so that the pair of gripping portions 18a and 18b are in an open state.

[0060] Then, the tissue to be collected is placed between the opened pair of gripping parts 18a and 18b, and the slider 24 is moved back along the groove 22 relative to the operating part body 23 of the operating part 5 toward the root end side of the operating part body 23. Figure 1 As shown, the pair of gripping members 4a, 4b are swung about the rotation axis 10 to close the pair of gripping portions 18a, 18b.

[0061] In this state, the tissue to be collected is sandwiched between the pair of gripping parts 18a and 18b. Therefore, when the operator applies force to the operating part 5 in a direction to further retreat the slider 24 relative to the operating part main body 23, the front ends of the gripping parts 18a and 18b can be sunk into the tissue, thereby cutting and collecting the tissue. If the tissue accommodated in the gripping parts 18a and 18b is excessive, the excess tissue can be made to overflow from the holes 20a and 20b provided in the gripping parts 18a and 18b.

[0062] In this case, when the operator applies a strong force to the operating portion 5 in order to cut the tissue, the pair of gripping members 4a and 4b can be pulled toward the root end side by the large tension applied to the operating wire 6, and therefore a large compressive force also acts on the pair of frame pieces 9a and 9b via the rotating shaft 10. Then, the pair of frame pieces 9a and 9b subjected to the compressive force are slightly elastically deformed in the direction of the longitudinal axis A of the spring tube 2 in the direction of compression.

[0063] Thus, the position of the rotating shaft 10 is slightly moved toward the root end side of the longitudinal axis A of the spring tube 2. Therefore, the abutment portion 17 of the buckling prevention member 11 previously arranged with a gap from the end face 2a of the spring tube 2 is Figure 6 As shown, it contacts the end face 2a of the spring tube 2. That is, at this moment, the rotating shaft 10 is supported by the pair of frame pieces 9a, 9b and the buckling prevention member 11 at the same time, so the compressive force is dispersed, thereby preventing excessive stress from acting on the frame pieces 9a, 9b.

[0064] As described above, according to the treatment instrument 1 for endoscope of the present embodiment, the compression force acting on the pair of frame pieces 9a, 9b can be reduced to prevent buckling simply by disposing the buckling prevention member 11 made of a metal thin plate between the rotating shaft 10 and the end face 2a of the spring tube 2. Therefore, there is an advantage that even when the pair of frame pieces 9a, 9b are formed by press working of a metal thin plate, the gripping members 4a, 4b can be supported with high strength.

[0065] That is, there is an advantage that the endoscopic treatment instrument 1 with improved strength can be provided even with a simple and inexpensive structure obtained by only pressing a metal thin plate instead of cutting a block-shaped metal sheet to form the thick frame pieces 9a and 9b.

[0066] Moreover, according to the present embodiment, when no large tension is applied to the operating wire 6 and the frame pieces 9a and 9b are not elastically deformed, a small gap is formed between the abutment portion 17 and the end face 2a of the spring tube 2. Thus, there are the following advantages: the processing accuracy of the buckling prevention component 11 and the assembly accuracy of the spring tube 2 and the front end support component 3 can be set to be low, and the manufacturing cost can be reduced. In addition, the trouble of joining the buckling prevention component 11 to the end face 2a of the spring tube 2 can be omitted.

[0067] The position where the abutment portion 17 abuts against the end face 2a of the spring tube 2 is surrounded by the cylindrical fixing portion 8 of the front end support member 3, so that the abutment position can be prevented from being exposed to the outside. Thus, tissue can be prevented from being sandwiched in the gap between the abutment portion 17 and the end face 2a of the spring tube 2.

[0068] Furthermore, when fitting the front end of the spring tube 2 into the fixing portion 8 of the front end support member 3, it is sufficient to fit the spring tube 2 until the end surface 2a of the spring tube 2 slightly contacts the contact portion 17, so the contact portion 17 can be used as a guide during assembly.

[0069] In addition, the buckling prevention component 11 is formed to be narrowed from the abutment portion 17 toward the front end of the buckling prevention component 11. Therefore, the buckling prevention component 11 does not protrude to a position radially outward from the outer diameter of the fixing portion 8, thereby preventing interference between the buckling prevention component 11 and surrounding tissues.

[0070] Furthermore, since the insertion end portion 16 provided on the buckling prevention member 11 is inserted into the spring tube 2 , the contact portion 17 can be positioned at a position where it can reliably contact the end surface 2 a of the spring tube 2 .

[0071] In the present embodiment, a method of making the abutting portion 17 of the buckling prevention component 11 abut against the end face 2a of the spring tube 2 is described, but this method may not be adopted and a method of making the abutting portion 17 abut against the front end of the fixing portion 8 may be adopted. In addition, in the present embodiment, a method of providing a gap between the abutting portion 17 and the end face 2a of the spring tube 2 and making the abutting portion 17 abut against the end face 2a of the spring tube 2 by utilizing the elastic deformation of the frame pieces 9a and 9b is described, but no gap may be provided. In addition, the abutting portion 17 may be fixed to the end face 2a of the spring tube 2 or the fixing portion 8 by welding or the like.

[0072] Alternatively, it can be Figure 7 As shown in the figure, a needle-like portion 26 extending between a pair of gripping members 4a and 4b is formed at the front end of the buckling prevention member 11. By adopting this structure, when the gripping members 18a and 18b clamp the tissue, the needle-like portion 26 can be inserted into the tissue to prevent the gripping members 18a and 18b from deviating from the desired portion to be collected. By integrally forming the needle-like portion 26 on the buckling prevention member 11 using a metal thin plate, the number of parts can be reduced.

[0073] In this embodiment, as a bearing, the through hole 15 is provided at one end of the buckling prevention member 11 as an example, but this method may not be adopted. Figure 8 As shown, a part of one end of the buckling prevention member 11 is cut away to form a hook-shaped structure in which the through hole 15 is connected to the outside.

[0074] In this embodiment, it can also be as follows Fig. 9As shown, the fixing portion 8 has a convex portion 27 formed by protruding a part of its inner peripheral surface in a direction intersecting the longitudinal axis of the fixing portion 8. Therefore, when the front end of the spring tube 2 is fitted into the fixing portion 8 of the front end support member 3, it is sufficient to fit it to a position where the end surface 2a of the spring tube 2 abuts against the convex portion 27 of the fixing portion 8, so positioning can be easily performed.

[0075] In this embodiment, it can also be as follows Fig.10 and Fig.11 As shown in the figure, the gripping members 4a and 4b are provided with protrusions 28 extending from the rotation shaft 10 to the front ends of the gripping members 4a and 4b. In this case, the buckling prevention member 11 has a certain area toward the front ends of the gripping members 4a and 4b, so the contact area between the gripping members 4a and 4b having the protrusions 28 and the buckling prevention member 11 increases. Therefore, it is possible to suppress the gripping members 4a and 4b from being misaligned with each other.

[0076] Description of Reference Numerals

[0077] 1 endoscope treatment instrument, 2 spring tube (sheath), 2a end surface, 3 front end support member, 4a, 4b grasping member, 5 operating portion, 6 operating wire, 8 fixing portion, 9a, 9b frame piece, 10 rotating shaft, 11 buckling prevention member (plate member), 16 insertion end portion, 17 abutting portion, 26 needle-shaped portion, A length direction axis.

Claims

1. An endoscope treatment instrument, characterized in that: include: Sheath; and a front end support member supported at the front end of the sheath, The front end support component comprises: a pair of frame pieces; a rotating shaft extending in a direction orthogonal to an axial direction in which the pair of frame pieces extend and connecting the front end portions of the pair of frame pieces to each other; and a plate member having a through hole, the through hole constituting a bearing into which the rotating shaft is embedded, The plate member extends between the rotation shaft and the sheath, The plate member can be slid relative to the sheath by the rotation shaft moving toward the sheath.

2. The endoscopic treatment instrument according to claim 1, characterized in that: The front end support component comprises: a pair of gripping members supported by the rotating shaft; and an operating wire connected to the pair of gripping members, When the operation wire is pulled, the rotation shaft can be supported simultaneously by the pair of frame pieces and the plate member.

3. The endoscopic treatment instrument according to claim 1 or 2, characterized in that: The sheath is a spring tube.

4. The endoscopic treatment instrument according to claim 2, characterized in that: It also includes an operating part arranged at the root end of the sheath, The operating wire is inserted into the sheath in the longitudinal axial direction of the sheath to connect the pair of gripping members to the operating portion. The operating portion can be operated to move the operating wire forward and backward in the longitudinal axial direction to transmit tension for swinging the pair of gripping members. When tension acts on the operation wire, the plate member receives a compressive force in the longitudinal axis direction.

5. The endoscopic treatment instrument according to claim 2, characterized in that: When tension acts on the operation wire, the base end portion of the plate member comes into contact with the end surface of the sheath.

6. The endoscopic treatment instrument according to claim 2, characterized in that: The front end support member includes a fixing portion for fixing the pair of frame pieces on the sheath. The fixing portion and the pair of frame pieces are integrally formed by bending a metal thin plate.

7. The endoscopic treatment instrument according to claim 6, characterized in that: When tension acts on the operation wire, the base end portion of the plate member comes into contact with the fixing portion.

8. The endoscopic treatment instrument according to claim 4, characterized in that: The plate member includes an insertion end portion extending in the longitudinal axis direction and insertable into the sheath.

9. The endoscopic treatment instrument according to claim 6, characterized in that: The fixing portion is formed into a cylindrical shape surrounding the radially outer side of the end surface of the sheath. When tension acts on the operation wire, the base end portion of the plate member comes into contact with the end surface of the sheath on the radially inner side of the fixing portion.

10. The endoscopic treatment instrument according to claim 2, characterized in that: The plate member includes a needle-shaped portion protruding between the pair of gripping members.

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