Forceps device

Abstract

To make it possible to easily and appropriately keep and release an operation state of handles in a forceps device.SOLUTION: A forceps device 1 comprises end effectors 21 and 22, a shaft 41, a body part 6, handles 81 and 82, a control body 7 capable of sliding and moving in a longitudinal direction inside the shaft 41, and a ratchet sleeve 98 capable of sliding and moving integrally with the control body 7. The ratchet sleeve 98 comprises an uneven part 98a. The body part 6 is arranged opposite to the uneven part 98a of the ratchet sleeve 98, and can be engaged with the uneven part 98a. The body part 6 comprises a ratchet block 100 comprising a convex part 100a for limiting movement of the control body 7 in a first direction of the longitudinal direction, and position adjustment parts (101, 102, 103, and 104) capable of adjusting the ratchet block 100 between a position where the convex part 100a can be engaged with a concave part of the uneven part 98a, and a position where the convex part 100a is separated from the uneven part 98a.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present disclosure relates to a forceps device. [Background technology]

[0002] Forceps devices are known as medical devices. Forceps devices are used to cut and grasp tissue in affected areas of a patient. In endoscopic surgery, an endoscopic camera equipped with a high-resolution camera is used, and an operator performs procedures using the endoscopic forceps device through a monitor. Depending on the surgical procedure, the forceps device may be inserted deep inside the body. The forceps device is designed so that the operator can operate the handle to open and close the end effector at the tip of the forceps device.

[0003] In forceps devices, it is sometimes necessary to maintain the state in which the end effector at the tip holds tissue at the affected area, a needle used for suturing, etc. If the operator continues to close the handles, this places a strain on the operator.

[0004] Therefore, Patent Document 1 discloses forceps in which ratchet teeth are provided on the handle itself of the forceps, making it possible to maintain the manipulated state of the handle and to open it appropriately. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-11019 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, in a forceps device, there are cases where it is necessary to maintain the manipulated state of the handle in a certain state or in a state where the handle is not opened beyond a certain point. Furthermore, in a forceps device, there are demands to prevent the manipulated state of the handle from being unintentionally lost and to facilitate the operation to release the manipulated state. The forceps disclosed in Patent Document 1 does not adequately meet these demands because the handle itself is provided with ratchet teeth.

[0007] The present disclosure has been made in light of the above circumstances, and its purpose is to provide a technique that makes it possible to easily and appropriately maintain or release the operated state of a handle in a forceps device. [Means for solving the problem]

[0008] In order to achieve this object, the forceps device according to the present disclosure is a forceps device comprising: an end effector, a hollow shaft to which the end effector is attached at its tip end; a main body to which the shaft is attached; a pair of handles; a control body whose tip is connected to a predetermined member and which is capable of sliding longitudinally inside the shaft by operating the pair of handles; and a moving unit which is capable of sliding longitudinally together with the control body in the shaft, wherein the moving unit has a plurality of uneven portions aligned in the longitudinal direction, and the main body has a movement limiting unit which is arranged opposite the uneven portions and is engageable with the uneven portions, and which has convex portions which, by engaging with the concave-convex portions, limit the movement of the control body in at least a first direction in the longitudinal direction, and a position adjusting unit which can adjust the movement limiting unit between a position where the convex portions can engage with concave portions of the uneven portions and a position where the convex portions are spaced apart from the uneven portions.

[0009] According to this forceps device, the operated state of the handle can be easily and appropriately maintained and released.

[0010] In the forceps device, the concave portion of the uneven portion may be a ratchet tooth whose surface in the first direction in the longitudinal direction is a surface perpendicular to the longitudinal direction and whose surface in a second direction opposite to the first direction is an inclined surface that gradually becomes shallower, and the convex portion may have a shape corresponding to the ratchet tooth. According to this forceps device, the operating state of the handle can be changed so that the control body cannot move in the first direction but can move in the second direction.

[0011] In the forceps device, the predetermined member may be an opening / closing member that opens and closes the end effector. According to this forceps device, the opening and closing of the end effector can be appropriately maintained.

[0012] In the forceps device, the control body may be rotatable about an axis in the longitudinal direction. This forceps device can be used even when the control body rotates about an axis.

[0013] In the forceps device, the moving unit may be rotatable relative to the control body about the longitudinal axis, but may not rotate about the axis. With this forceps device, the moving unit can be prevented from rotating even when the control body rotates.

[0014] In the forceps device, the predetermined member may be a rotation member that rotates the end effector about the longitudinal axis. According to this forceps device, the end effector can be made to rotate.

[0015] In the forceps device, the concave and convex portions of the concave and convex portions may be formed so as to extend in a predetermined direction, and the convex portions may be formed so as to extend in the predetermined direction. With this forceps device, the concave and convex portions of the concave and convex portions can be engaged in contact with each other over a wide area.

[0016] In the forceps device, the position adjustment unit may include an elastic body that biases the convex portion toward the concave-convex portion, and a separation operation unit that is movable so as to separate the convex portion from the concave-convex portion. With this forceps device, it is possible to easily adjust the state in which the convex portion engages with the concave-convex portion and the state in which the convex portion is separated from the concave-convex portion.

[0017] In the forceps device, the control body may be a columnar or cylindrical member, and may further include a chuck portion that grips the control body and is slidable integrally with the control body, the moving portion being arranged so as not to slide relative to the chuck portion but to be rotatable relative thereto. This forceps device allows the control body to be appropriately gripped with a simple structure.

[0018] In the forceps device, the chuck portion may include a chuck member having a plurality of claw portions arranged to surround the control body, and a chuck member accommodating portion that accommodates the chuck member and presses the claw portions so that the chuck member grips the control body. With this forceps device, the control body can be gripped more reliably. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view of an end effector of a forceps device according to one embodiment in an open state. FIG. [Figure 2] FIG. 2 is a perspective view of the forceps device with the end effector in a closed state. [Figure 3] FIG. [Figure 4] FIG. 2 is a side view of the forceps device in the state shown in FIG. 1. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 10 is a cross-sectional view of the forceps device with the tip bent at 45 degrees. [Figure 7] FIG. 10 is a cross-sectional view of the forceps device with the tip bent by 90 degrees. [Figure 8] FIG. 2 is a cross-sectional view of the forceps device with the end effector in a closed state. [Figure 9] FIG. 10 is a front view of the handle-side main body when the ratchet mechanism is activated. [Figure 10] FIG. 10 is a cross-sectional view taken along line BB in FIG. 9. [Figure 11] FIG. 10 is a side view of the handle-side main body when the ratchet mechanism is activated. [Figure 12] FIG. 12 is a cross-sectional view taken along line CC in FIG. [Figure 13] FIG. 10 is a cross-sectional side view of the handle-side main body when the ratchet mechanism is disabled. [Figure 14] 10 is a cross-sectional side view of the handle-side main body taken along a line corresponding to line CC when the ratchet mechanism is disabled. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Although the forceps device according to the embodiment will be described with reference to the drawings, the present disclosure is not limited to the embodiment shown in the drawings. The forceps device shown in each drawing is shown with exemplary dimensions to facilitate understanding of the implementation, and the actual dimensions are not limited to these. In this specification, the terms "distal side" and "distal direction" refer to the side and direction of the part of the forceps device that is inserted into a body cavity. The terms "proximal side" and "proximal direction" refer to the side and direction of the handle that applies power to operate the forceps device. The term "distal" refers to the distal end of any member or part, and the term "proximal end" refers to the proximal end of any member or part.

[0021] FIG. 1 is a perspective view of a forceps device according to one embodiment, with an end effector thereof in an open state. FIG. 2 is a perspective view of the forceps device in a closed state. When describing the directions in the drawings, the X-axis, Y-axis, and Z-axis shown in the drawings will be used as appropriate. The X-axis, Y-axis, and Z-axis indicate the same directions in each drawing. The X-axis indicates the longitudinal direction of the forceps device 1 in the reference state shown in FIG. 1, with the positive direction of the X-axis and the arrow pointing to the distal end, and the opposite, negative direction of the X-axis, indicating the proximal end. The Z-axis direction is the vertical direction of the forceps device 1 in the reference state, and the Y-axis is the lateral direction perpendicular to the longitudinal direction. The Z-axis direction is sometimes referred to as the up-down direction, and the Y-axis direction is sometimes referred to as the left-right direction or lateral direction.

[0022] The forceps device 1 includes a tip portion 2, a shaft portion 4, a main body portion 6, and a handle operation unit 8. The tip portion 2 is located at the tip end of the shaft portion 4 and is used to grasp an object. The tip portion 2 has end effectors 21 and 22, which can open and close as shown in FIG. 2 . The tip portion 2 can be straight along the axial direction of the shaft portion 4 or bent in a predetermined direction. The shaft portion 4 has a cylindrical shape connecting the tip portion 2 and the main body portion 6. The shaft portion 4 is rotatable about its longitudinal axis relative to the main body portion 6. By rotating the shaft portion 4, the entire tip portion 2 is rotated, and the plane on which the end effectors 21 and 22 of the tip portion 2 open and close can be adjusted.

[0023] The main body 6 is connected to the base end side of the shaft 4. The main body 6 includes a shaft-side main body 6A and a handle-side main body 6B. The main body 6 has an angle dial 72 that the operator operates to perform bending and straightening operations such as straightening the tip end 2 relative to the shaft 4 or bending it, and a shaft rotation dial 71 that the operator operates to rotate the shaft 4.

[0024] The handle operating unit 8 is operated by the operator to open and close the end effectors 21, 22 of the distal end portion 2. In this embodiment, basically, when the pair of handles 81, 82 of the handle operating unit 8 is closed, i.e., when the angle between them is narrowed, the end effectors 21, 22 are closed. When the pair of handles 81, 82 of the handle operating unit 8 is opened, i.e., when the angle between them is widened, the end effectors 21, 22 are opened.

[0025] The following describes each component of the forceps device 1. Fig. 3 is an exploded perspective view of the forceps device.

[0026] The distal end portion 2 of the forceps device 1 includes end effectors 21, 22, a distal end connecting portion 23, a link member 24, and a control body mounting portion 25. The shaft portion 4 includes a main shaft 41, an inner shaft 42, a proximal end connecting portion 43, a slider 44, a link member 45, and a control body 7. The shaft side main body portion 6A of the main body 6 includes shaft side main body cases 60, 61, slider accommodating portions 62, 63, a slider 64, a slider cap 65, a spring case 66, a leaf spring 67, a snap ring 68, a screw 69, a shaft 70, a shaft rotation dial 71, an angle dial 72, a handle lock bolt 73, and a nut 74. The handle-side main body 6B includes handle-side main body cases 89 and 90, shafts 91 and 92, a chuck member accommodating portion 94, a chuck member 95, a chuck fixing member 96, a rotary dial 97, a ratchet sleeve 98, a ratchet block 100, cam arms 101 and 102, a spring 103, and a cam 104. The shaft-side main body 6A and the handle-side main body 6B are detachable from each other. A nut 74 is fixed to the shaft-side main body case 60 of the shaft-side main body 6A. The handle-side main body 6B can be fixed to the shaft-side main body 6A by tightening the handle lock bolt 73 against the nut 74. The handle operating portion 8 of the forceps device includes a pair of handles 81 and 82, link members 83 and 84, pins 85 and 86, and fixing member mounting portions 87 and 88.

[0027] The configuration and operation relating to bending of the tip portion 2 relative to the shaft portion 4 will be described. Fig. 4 is a side view of the forceps device in the state shown in Fig. 1. Fig. 5 is a cross-sectional view taken along line AA in Fig. 4. Fig. 6 is a cross-sectional view of the forceps device with the tip portion bent at 45 degrees. Fig. 7 is a cross-sectional view of the forceps device with the tip portion bent at 90 degrees.

[0028] The main shaft 41 is a hollow cylindrical shaft and is made of, for example, CFRP (Carbon Fiber Reinforced Plastic) or medical stainless steel. The inner shaft 42 is a hollow cylindrical shaft and is made of, for example, CFRP or medical stainless steel. A flange portion 42a is formed on the base end side of the inner shaft 42. A base end side connecting portion 43 is connected to the main shaft 41. The tip end side connecting portion 23 is rotatably connected to the tip end side of the base end side connecting portion 43.

[0029] The slider 44 is connected to the inner shaft 42 and is movable in the X-axis direction integrally with the inner shaft 42. The tip side of the link member 45 is rotatably connected to the tip side connecting portion 23. The base end side of the link member 45 is rotatably connected to the slider 44.

[0030] In the shaft-side main body portion 6A of the main body portion 6, slider accommodating portions 62, 63 are accommodated in the shaft-side main body cases 60, 61 so as to be rotatable about the central axis of the inner shaft in the longitudinal direction.

[0031] The slider accommodating portions 62 and 63 are connected to be integrally rotatable with the angle dial 72. On the inner periphery of the slider accommodating portions 62 and 63, a spiral groove 62a is formed along the X-axis direction.

[0032] A slider 64 is accommodated in the slider accommodation portions 62, 63. A male-threaded convex portion corresponding to the spiral groove 62a of the slider accommodation portions 62, 63 is formed on the outer periphery of the slider 64. The convex portion of the slider 64 may be a continuous spiral or may be an intermittent convex portion. A space for accommodating the flange portion 42a of the inner shaft 42 is formed on the negative X-axis side of the slider 64. The flange portion 42a is accommodated in this space of the slider 64, and the negative X-axis side of the flange portion 42a is sealed with a slider cap 65, allowing the slider 64 and the inner shaft 42 to slide together. Two shafts 70, which are arranged along the X-axis and inserted through the shaft-side main body cases 60, 61, are inserted into the slider 64. The shafts 70 restrict the slider 64 to move only in the X-axis direction.

[0033] With this configuration, when the forceps device 1 is in a straight state as shown in Fig. 5, rotating the angle dial 72 clockwise about the X-axis when viewed in the positive direction of the X-axis causes the slider accommodating portions 62, 63 to rotate. As the slider accommodating portions 62, 63 rotate, the slider 64 engaged with the spiral groove 62a moves in the negative direction of the X-axis, and the inner shaft 42 moves in the negative direction of the X-axis.

[0034] When the inner shaft 42 moves in the negative direction of the X-axis, the slider 44 connected to the inner shaft 42 moves in the negative direction of the X-axis, and the tip-side connection portion 23 rotates in the positive direction of the Y-axis via the link member 45 connected to the slider 44, as shown in Figure 6.

[0035] When the angle dial 72 is further rotated clockwise around the X-axis when viewed in the positive direction of the X-axis, the tip-side connecting part 23 rotates in the positive direction of the Y-axis in the same manner as above. In this embodiment, the tip-side connecting part 23 rotates to an angle of 90 degrees with respect to the shaft part 4, as shown in FIG.

[0036] When the forceps device 1 is bent, rotating the angle dial 72 counterclockwise around the X-axis when viewed in the positive direction of the X-axis causes the slider accommodating portions 62, 63 to rotate. As the slider accommodating portions 62, 63 rotate, the slider 64 engaged with the spiral groove 62a moves in the positive direction of the X-axis, and the inner shaft 42 moves in the positive direction of the X-axis.

[0037] When the inner shaft 42 moves in the positive direction of the X-axis, the slider 44 connected to the inner shaft 42 moves in the positive direction of the X-axis, and the tip-side connection portion 23 rotates in the negative direction of the Y-axis via the link member 45 connected to the slider 44, as shown in Figure 6.

[0038] When the angle dial 72 is further rotated counterclockwise around the X-axis when viewed in the negative direction of the X-axis, the tip-side connecting part 23 rotates in the negative direction of the Y-axis in the same manner as above. In this embodiment, the tip-side connecting part 23 rotates until it becomes straight with respect to the shaft part 4, as shown in FIG.

[0039] The configuration and operation relating to the rotation of the shaft portion 4 and the distal end portion 2 of the forceps device 1 will be described with reference to FIGS.

[0040] A recess 60 a that can engage with a protrusion 67 a of a leaf spring 67 is formed on the inner periphery of the tip end side of the shaft side main body cases 60 , 61 on a circumference centered on the center of the main shaft 41 .

[0041] A spring case 66 is housed in the shaft-side main body cases 60 and 61. A leaf spring 67 is attached to the spring case 66 with its protrusion 67a facing the outer periphery. The main shaft 41 is inserted into the spring case 66. The main shaft 41 and the spring case 66 are fixed with a screw 69 so that they can rotate integrally.

[0042] A shaft rotation dial 71 is attached to the tip side of the spring case 66, and a snap ring 68 is attached to the tip side of the shaft rotation dial 71. This snap ring 68 prevents the shaft rotation dial 71 from coming off the tip side of the spring case 66. A recess (not shown) that engages with the protrusion 67a of the leaf spring 67 is formed on the inner periphery of the shaft rotation dial 71. This allows the shaft rotation dial 71 and the spring case 66 to rotate integrally.

[0043] With this configuration, when the shaft rotation dial 71 is rotated clockwise around the X-axis when viewed in the positive direction of the X-axis, the spring case 66 rotates clockwise around the X-axis, the main shaft 41 that rotates integrally with the spring case 66 also rotates clockwise around the X-axis, and the tip portion 2 connected to the main shaft 41 also rotates clockwise around the X-axis.

[0044] When the shaft rotation dial 71 is rotated counterclockwise around the X-axis when viewed in the positive direction of the X-axis, the spring case 66 rotates counterclockwise around the X-axis, the main shaft 41 that rotates integrally with the spring case 66 also rotates counterclockwise around the X-axis, and the tip portion 2 connected to the main shaft 41 also rotates counterclockwise around the X-axis.

[0045] The configuration and operation relating to the opening / closing and rotation of the end effector at the distal end portion 2 of the forceps device 1 will be described with reference to Figures 3, 5, and 8. For ease of explanation, the description will be given taking as an example a case where the ratchet mechanism, which will be described later, is disabled.

[0046] The tip-side connection part 23 is a part that is connected to the shaft part 4. The end effector 22 is a part that grips an object. The end effector 21 has a part on the tip side that grips an object together with the end effector 22, and a part on the base end side that is connected to the tip-side connection part 23. The end effectors 21, 22 are rotatably connected via a pin. The end effector 21 is rotatable around the X-axis relative to the tip-side connection part 23.

[0047] The link member 24 has a tip end connected to the end effector 22 via a pin and a base end connected to the control body mounting portion 25 via a pin. The control body mounting portion 25 is restricted to linear movement inside the end effector 21. The control body mounting portion 25 is rotatable around the central axis of the main shaft 41. The tip end of the control body 7 is mounted to the control body mounting portion 25. The link member 24 and the control body mounting portion 25 are examples of an opening / closing member and a rotating member. The control body 7 is formed, for example, from a hypotube or a wire rope. The control body 7 is, for example, a columnar or cylindrical member. In this embodiment, the tip end portion 2 and the shaft portion 4 are bent, so the tip end portion 7a of the control body 7 is formed from a wire rope.

[0048] In the distal end portion 2, the movement of the control body 7 is transmitted to the end effector 22 via the control body mounting portion 25 and the link member 24. When the control body 7 is moving toward the distal end, as shown in Fig. 5, the control body mounting portion 25 and the link member 24 are pushed toward the distal end, and as a result, the base end side of the end effector 22 is pushed, and the end effectors 21 and 22 are opened.

[0049] When the control body 7 is moving toward the base end, the control body mounting portion 25 and the link member 24 are pulled toward the base end as shown in Figure 8, and as a result, the base end side of the end effector 22 is pulled, and the end effectors 21, 22 are in a closed state.

[0050] When the control body 7 is rotated around the central axis of the main shaft 41, the control body mounting portion 25 and the link member 24 are rotated around the central axis of the main shaft 41, and as a result, the end effectors 21, 22 are rotated around the central axis of the main shaft 41.

[0051] In the handle operating unit 8, the handle 81 is a portion into which the index finger and middle finger are inserted when the forceps device 1 is operated with the right hand, for example, to hold the forceps device 1 and apply a driving force for opening and closing the end effectors 21 and 22. The handle 82 is a portion into which the thumb is inserted when the forceps device 1 is operated with the right hand, for example, to hold the forceps device 1 and apply a driving force for opening and closing the end effectors 21 and 22.

[0052] The angle between the handle 81 and the handle 82 can be adjusted by the operator.

[0053] The base end side of a chuck fixing member 96 is attached to the fixing member attachment portions 87 and 88. The link member 83 is rotatably connected to the handle 81 and also rotatably connected to the fixing member attachment portions 87 and 88. The link member 84 is rotatably connected to the handle 82 and also rotatably connected to the fixing member attachment portions 87 and 88.

[0054] With this configuration, when the angle between the handles 81 and 82 is narrowed, the fixing member mounting portions 87 and 88 are moved toward the base end, and the chuck fixing member 96 is pulled toward the base end. When the angle between the handles 81 and 82 is widened, the fixing member mounting portions 87 and 88 are pushed toward the tip end, and the chuck fixing member 96 is pushed toward the tip end.

[0055] As will be explained later, the chuck fixing member 96 moves integrally with the control body 7. Therefore, when the chuck fixing member 96 is pulled toward the base end, the control body 7 is pulled toward the base end. As a result, the end effectors 21, 22 move in the closing direction. When the chuck fixing member 96 is pushed toward the tip end, the control body 7 is pushed toward the tip end. As a result, the end effectors 21, 22 move in the opening direction.

[0056] The configuration and operation relating to the enabled and disabled states of the ratchet mechanism that limits the movement of the control body 7 in one direction in the forceps device 1 will be described with reference to FIGS. 3, 5, and 9 to 14.

[0057] Figure 9 is a front view of the handle side main body when the ratchet mechanism is activated. Figure 10 is a cross-sectional view taken along line BB in Figure 9. Figure 11 is a side view of the handle side main body when the ratchet mechanism is activated. Figure 12 is a cross-sectional view taken along line CC in Figure 11. Figure 13 is a side cross-sectional view of the handle side main body when the ratchet mechanism is deactivated. Figure 14 is a side cross-sectional view taken along a line equivalent to line CC of the handle side main body when the ratchet mechanism is deactivated. The ratchet mechanism refers to a ratchet sleeve 98 and a ratchet block 100.

[0058] The base end side of the control body 7 is housed in a chuck member 95. The chuck member 95 has a through-hole in the center for housing the control body 7, and has a plurality of, for example, four claw portions 95a on the tip side.

[0059] The chuck member 95 is accommodated in a chuck member accommodation portion 94 and a chuck fixing member 96. A thread groove is formed on the outer periphery of the base end side of the chuck member accommodation portion 94. A thread groove corresponding to the thread groove is formed on the inner periphery of the base end side of the chuck fixing member 96. When the chuck member 95 is accommodated inside the chuck member accommodation portion 94 and the chuck fixing member 96 and the chuck fixing member 96 is screwed into the chuck member accommodation portion 94, the claw portions 95a of the chuck member 95 are pressed radially inward, tightly gripping the control body 7 accommodated in the chuck member 95. This allows the chuck unit including the chuck member accommodation portion 94, the chuck member 95, and the chuck fixing member 96 and the control body 7 to move integrally. When the chuck unit moves in the X-axis direction, the control body 7 moves in the X-axis direction, and when the chuck unit rotates, the control body 7 also rotates.

[0060] A rotary dial 97 is rotatably connected to the chuck member accommodating portion 94. Therefore, when the rotary dial 97 is rotated, the chuck member accommodating portion 94 rotates, and as a result, the control body 7 also rotates.

[0061] A ratchet sleeve 98, which is an example of a moving part, is arranged on the outer periphery of the chuck member accommodating part 94. The ratchet sleeve 98 cannot slide in the X-axis direction relative to the chuck member accommodating part 94, i.e., it can move integrally in the X-axis direction. The ratchet sleeve 98 can rotate relative to the rotation of the chuck member accommodating part 94 about its axis. The ratchet sleeve 98 has an engaging part 98b that engages with the handle side main body cases 89, 90, and is unable to rotate relative to the handle side main body cases 89, 90.

[0062] The ratchet sleeve 98 has a concave-convex portion 98a on the positive side of the Y axis, which has multiple recesses lined up in the X axis direction. In this embodiment, the concave portions of the concave-convex portion 98a have the same cross-sectional shape extending in the Z axis direction. The concave portions of the concave-convex portion 98a have a ratchet tooth shape that allows the control body 7 to move toward the base end (first direction) but not toward the tip end (second direction) when the ratchet mechanism is active. In other words, the concave portions of the concave-convex portion 98a have a surface perpendicular to the X axis on the base end side and an inclined surface that gradually becomes shallower toward the tip end side.

[0063] With this configuration, the ratchet sleeve 98 moves as a unit when the chuck portion moves in the X-axis direction, and does not rotate when the chuck portion rotates. This keeps the uneven portion 98a facing the ratchet block 100. With this configuration, the contact surface between the uneven portion 98a and the protrusions 100a of the ratchet block 100 (described later) can be made larger, thereby reducing wear and damage to the uneven portion 98a and the protrusions 100a.

[0064] A ratchet block 100 as an example of a movement limiting portion, cam arms 101 and 102, a cam 104 as an example of a separation operation portion, and a spring 103 as an example of an elastic body are assembled to the handle-side main body casings 89 and 90. Specifically, pins extending on both sides of the ratchet block 100 in the Z-axis direction and pins extending on both sides of the cam 104 in the Z-axis direction are attached to the cam arms 101 and 102, and the handle-side main body casings 89 and 90 are assembled to the handle-side main body casings 89 and 90. The spring 103 is attached to the handle-side main body casing 90 so as to bias the ratchet block 100 in the negative Y-axis direction. The cam arms 101 and 102, the cam 104, and the spring 103 constitute a position adjustment portion. In this embodiment, providing the cam 104 at a location separate from the handles 81 and 82 reduces the occurrence of accidentally touching the cam 104 and disabling the ratchet mechanism during operation of the handles 81 and 82.

[0065] One or more convex portions 100a corresponding to the concave portions of the uneven portion 98a of the ratchet sleeve 98 are formed on the surface of the ratchet block 100 in the negative direction of the Y axis. In this embodiment, the convex portions 100a have a ratchet tooth shape that allows the control body 7 to move toward the base end when the ratchet mechanism is active but prevents it from moving toward the tip end, i.e., the base end side is a surface perpendicular to the X axis and the tip end side is an inclined surface that gradually becomes lower.

[0066] With this configuration, the height of the ratchet block 100 can be changed depending on the state of the cam 104 arranged in the positive direction of the Y axis of the handle side main body case 89, 90, i.e., the adjustment distance between the center of rotation of the cam 104 and the top surface of the handle side main body case 89, 90.

[0067] For example, as shown in Figure 10, when the adjustment distance is D1, as shown in Figures 10 to 12, the convex portion 100a of the ratchet block 100 is positioned to engage with one of the concave portions of the uneven portion 98a of the ratchet sleeve 98, and the ratchet mechanism is in an active state.

[0068] Thus, when the ratchet mechanism is active, the convex portion 100a engages with one of the concave portions of the concave-convex portion 98a, preventing the concave-convex portion 98a from moving in the positive direction of the X-axis. Therefore, even if a force is applied to widen the angle between the handles 81 and 82, the chuck portion, which moves integrally with the ratchet sleeve 98 in the X-axis direction, cannot move in the positive direction of the X-axis. Therefore, the control body 7 is not pushed in the positive direction of the X-axis, preventing the end effectors 21, 22 from moving in the opening direction.

[0069] Even if the convex portion 100a is engaged with one of the concave portions of the concave-convex portion 98a, when the ratchet sleeve 98 moves in the negative direction of the X axis, the convex portion 100a moves in the positive direction of the Y axis against the spring 103 in response to this movement, and the ratchet sleeve 98 can move in the negative direction of the X axis. Therefore, when a force is applied to narrow the angle between the handles 81 and 82, the chuck portion, which moves integrally with the ratchet sleeve 98 in the X axis direction, moves in the negative direction of the X axis. As a result, the control body 7 is pulled in the negative direction of the X axis, and the end effectors 21, 22 can operate in the closing direction.

[0070] When the cam 104 is rotated in the R1 direction in the state shown in Fig. 10, the adjustment distance becomes D2, which is larger than D1, as shown in Fig. 13. As a result, as shown in Figs. 13 and 14, the positions of the cam arms 101, 102 and the ratchet block 100 are moved to positions higher than the positions shown in Figs. 10 to 12. As a result, the convex portion 100a is positioned so that it does not engage with any of the concave portions of the uneven portion 98a, and the ratchet mechanism becomes ineffective.

[0071] The technology disclosed in this specification is not limited to the above-described embodiments and modifications, and can be modified in various forms without departing from the spirit thereof, for example, the following modifications are also possible.

[0072] In the above-described embodiment, the end effectors 21, 22 of the distal end portion 2 are opened when the handles 81, 82 are opened, but the end effectors may be closed when the handles are opened. The end effectors may have a function to cut an object, not limited to a function to grasp the object.

[0073] The uneven portion 98a and the protruding portion 100a may have a ratchet tooth shape that does not allow the control body 7 to move in one direction, but may have a shape that prevents the control body 7 from moving in both directions, for example.

[0074] The ratchet sleeve 98 may be configured to rotate integrally with the chuck member accommodating portion 94, rather than being unable to rotate integrally with the chuck member accommodating portion 94. In this case, an uneven portion may be formed on the outer periphery of the ratchet sleeve.

[0075] The components of the forceps device 1 are not limited to those shown in FIG. 3, but may be, for example, a single component formed by integrating multiple components, or a single component may be divided into multiple components.

[0076] The present disclosure is not limited to the above-described embodiments, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

Claims

1. A forceps device (1), comprising: End effectors (22, 23); a hollow shaft (41) to which the end effectors (22, 23) are attached at the distal end; a main body (6) to which the shaft (41) is attached; A pair of handles (81, 82); a control body (7) whose tip is connected to a predetermined member and which is slidable longitudinally inside the shaft (41) by operating the pair of handles (81, 82); a moving part (98) that is slidable integrally with the control body (7) in the longitudinal direction of the shaft (41), The moving part (98) A plurality of uneven portions (98a) are arranged in the longitudinal direction, The main body portion (6) is a movement limiting portion (100) having a convex portion (100a) that is arranged opposite the concave-convex portion (98a) and is engageable with the concave-convex portion (98a), and that limits movement of the control body (7) in at least a first direction in the longitudinal direction by engaging with the concave-convex portion (98a); and position adjustment units (101, 102, 103, 104) that can adjust the movement limiting unit (100) between a position where the convex portion (100a) can engage with the concave portion of the uneven portion (98a) and a position where the convex portion (100a) is spaced apart from the uneven portion (98a). Forceps device (1).

2. The concave portion of the uneven portion (98a) is a ratchet tooth whose surface in the first direction in the longitudinal direction is a surface perpendicular to the longitudinal direction, and whose surface in the second direction opposite to the first direction is an inclined surface whose depth gradually becomes shallower, The convex portion (100a) has a shape corresponding to the ratchet teeth. A forceps device (1) according to claim 1.

3. The predetermined member is an opening / closing member (24, 25) that opens and closes the end effector (22, 23). A forceps device (1) according to claim 1 or claim 2.

4. The control body (7) is rotatable about the longitudinal axis. A forceps device (1) according to any one of claims 1 to 3.

5. The moving part (98) is rotatable relative to the control body (7) about the longitudinal axis, but does not rotate about the axis. A forceps device (1) according to claim 4.

6. The predetermined member is a rotation member (24, 25) that rotates the end effector (22, 23) around the longitudinal axis. A forceps device (1) according to claim 4 or claim 5.

7. The concave and convex portions (98a) are formed by extending the concave portions in a predetermined direction, The protrusion (100a) is formed to extend in the predetermined direction. A forceps device (1) according to any one of claims 1 to 6.

8. The position adjustment unit (101, 102, 103, 104) an elastic body (103) that biases the convex portion (100a) toward the concave-convex portion (98a); a separation operation unit (104) movable so as to separate the convex portion (100a) from the concave-convex portion (98a); have A forceps device (1) according to any one of claims 1 to 7.

9. The control body (7) is a columnar or cylindrical member, The control device further includes chuck portions (94, 95, 96) that grip the control body (7) and are slidable integrally with the control body (7), The moving portion (98) is arranged so as to be unable to slide relative to the chuck portions (94, 95, 96) but to be rotatable relative thereto. A forceps device (1) according to any one of claims 1 to 8.

10. The chuck portions (94, 95, 96) are a chuck member (95) having a plurality of claw portions (95a) arranged to surround the control body (7); and chuck member accommodating portions (94, 96) that accommodate the chuck member (95) and press the claw portion (95a) so that the chuck member (95) grips the control body (7). A forceps device (1) according to claim 9.

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