JP2003175047A - Treatment tool for surgery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment tool for surgery by which disassembling work and assembling work are easily performed in a short period and which is suitable as medical equipment which has to be highly clean. <P>SOLUTION: The treatment tool for surgery is provided with an insertion section 3, an operating section 5 including a fixed handle 76 and a movable handle 77, and a treatment section drive unit 2 including a treatment section 77, a drive shaft 24 and a drive unit 23. A cylindrical engaging section 121 is arranged at the forward end side of the fixed handle 76, and an engaging/ disengaging member 111 is arranged at the hand of the insertion section 3 and is adapted to engage the engaging section 121. A biasing member 108 is provided for energizing the engaging/disengaging member 111 toward the position of engagement between the engaging/disengaging member 111 and the engaging section 121. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surgical treatment instrument which is inserted into a body cavity to treat an affected tissue.

[0002]

2. Description of the Related Art Conventionally, a surgical treatment tool disclosed in, for example, DE4307539A1 or DE4323093A1 has three components, an operation part, an insertion part, and a treatment part drive unit, and only a damaged part can be partially replaced. In order to easily wash the inside of the insertion portion, the insertion portion is separable into the above-mentioned three constituent portions. In this case, the insertion section and the operation section are detachably connected to each other by a screw-type connection mechanism.

[0003]

However, since the conventional surgical treatment instrument employs the screw type coupling mechanism at the connecting portion between the inserting portion and the operating portion, the attaching / detaching work is troublesome and the attaching / detaching operation is difficult. It takes time to work. In addition, the screw-type coupling mechanism is likely to collect dust, body fluid, blood, etc., generated during the operation in the ridges and valleys of the screw, and is easily soiled. Furthermore, since it is difficult to clean the ridges and troughs of the screw portion, the screw type coupling mechanism is not preferable to be applied to equipment that requires a high degree of cleanliness, such as medical equipment.

The present invention has been made in view of the above circumstances, and an object thereof is to carry out disassembling work and assembling work in a short time, and to make medical equipment highly required to be clean. The present invention is to provide a suitable surgical treatment tool.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 includes an insertion portion to be inserted into a living body; and a fixed handle connected to the proximal side of the insertion portion. An operation section having a movable handle operable with respect to the fixed handle; an operable treatment section arranged on the distal end side of the insertion section; a drive shaft for transmitting an operation force of the operation section; In a surgical treatment tool including a treatment section drive unit having a drive unit that drives the treatment section in response to movement of a drive shaft, a cylindrical engagement section is provided on the distal end side of the fixed handle. An engaging / disengaging member that is engageable with and disengageable from the engaging portion and a biasing unit that biases the engaging / disengaging member to an engaging position with the engaging portion are provided on the proximal side of the insertion portion. It is characterized by being

The surgical treatment tool according to a second aspect of the present invention has an insertion portion having an internal space which can be inserted into a living body and which penetrates from a distal end portion to a proximal end portion, and a predetermined position in the internal space. A disposable treatment section unit, a coupling section provided at a proximal end of the treatment section unit, a treatment section that is provided at a distal end of the treatment section unit and capable of treating the inside of the living body, and the coupling section Driving means for driving the treatment section according to movement, an operation section connectable to the proximal side of the insertion section and for operating the treatment section unit, and a fixed handle provided on the operation section. And provided on the operation unit,
A movable handle which is relatively movable with respect to the fixed handle, an engaging portion which is provided on the movable handle and is engageable with the coupling portion, and an operating portion,
Engagement that connects the operation portion and the proximal end of the insertion portion so that the engagement portion and the coupling portion of the treatment portion unit arranged at the predetermined position in the insertion portion engage with each other. An engaging / disengaging member that is provided on the proximal side of the insertion portion and on the proximal end side of the insertion portion and is engageable with the engaging portion; and a biasing member that biases the engaging / disengaging member to an engaging position with the engaging portion. And a biasing means.

The surgical treatment instrument according to a third aspect of the present invention is an insertion portion that can be inserted into a living body, an operable treatment portion that is disposed on the distal end side of the insertion portion, and a proximal end portion of the insertion portion. And a drive shaft for connecting the treatment section to transmit the operation force of the operation section to the treatment section, and a base of the insertion section. A drive shaft support member provided at an end portion for supporting the drive shaft, an insertion portion connection portion provided at the operation portion and having an opening into which the drive shaft support member can be inserted, and the insertion portion connection. And an engagement / disengagement portion provided on the insertion portion, the engagement / disengagement portion being located at an engagement position engageable with the engagement portion in association with the insertion operation of the drive shaft support member into the opening portion. Member and an urging hand that is provided in the insertion portion and urges the engagement / disengagement member to the engagement position. Characterized by including and.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 19 show a first embodiment of the present invention. As shown in FIG. 1, the surgical treatment tool 1 of the present embodiment has four components, namely, a treatment section drive unit 2, an insertion section 3, and a rotary locking member 4 as a rotary locking means. It is composed of an operating part 5 and can be separated into four constituent parts 2, 3, 4, 5 as shown in FIG.

As shown in FIG. 3, the treatment section drive unit 2
A treatment section 7 is provided on the tip side of the. This treatment section 7
Has a pair of gripping members (treatment members) 6 and 6 that can be opened and closed. A link arm 8 is provided on the proximal end side of each gripping member 6.
Are provided integrally. As shown in FIG. 4 (a cross-sectional view taken along the line AA in FIG. 3), a fitting hole 9 is formed in the base end portion of the link arm 8, and the sliding pin 10 rotates in the fitting hole 9. It is provided freely.

As shown in FIGS. 3 and 4, a support member having two support arms 11 and 11 positioned on both sides of the link arms 8 and 8 on the proximal end side of the gripping members 6 and 6, respectively. 12 are provided. In this case, the gripping members 6 and 6 (link arms 8 and 8) are
It is rotatably connected to the support member 12 via a pin 13 fixed to 11.

As shown in detail in FIG. 5, a cylindrical connecting portion 14 is formed on the base end side of the support member 12. An abutting surface 15 is formed at the base end of the connecting portion 14. On the outer peripheral surface of the connecting portion 14 on the base end side, two projecting portions 16 and 16 which are symmetrical with respect to the central axis of the connecting portion 14 are formed. Each of the protrusions 16 and 16 includes an abutting surface 17 located on the distal end side, a slope surface 18 located on the proximal end side, slope surfaces 19 and 20 located on the proximal end side portion, and a distal end side portion. It has the slope surface 21 located.

As shown in FIGS. 3 to 5, gripping members 6 and 6 are provided.
A drive member (drive means) 23 is provided on the base end side of the device in a state of being sandwiched between the link arms 8 and 8. The drive member 23 has cam grooves 22, 22 with which the sliding pins 10, 10 are slidably engaged. In addition, the drive member 23
The base end side is inserted into the inner hole of the support member 12, and is supported by the support member 12 so that it can move back and forth. The outer surfaces of the sliding pins 10, 10, the fitting holes 9, 9 and the cam grooves 22, 22 may be coated with, for example, a fluororesin having good slipperiness.

A drive shaft 24 is integrally provided on the drive member 23. The drive shaft 24 extends from the base end of the drive member 23 and has a large diameter portion 25 at the base end (see FIG. 5). The large diameter portion 25 has two flat surfaces 26, 2 parallel to each other.
6 is formed. A ball-shaped coupling portion 27 is provided at the base end of the drive shaft 24. Furthermore, drive shaft 2
As shown in FIG. 3, a tube 28 made of an electrically insulating material is coated on the outer circumference of the proximal end portion of the nozzle 4.

The treatment section drive unit 2 having the above structure is inserted into the sheath 29 of the insertion section 3 inserted into the living body.
The sheath 29 is configured by covering the outer circumferences of the pipe (connecting portion) 30 and the tip pipe 32 with a tube 36 made of an electrically insulating material. FIG. 6 (B in FIG. 3)
As shown in FIG. 8, a cross-sectional view taken along the line -B), FIG. 7 (cross-sectional view taken along the line CC in FIG. 6), and FIG.
The substantially L-shaped engaging grooves 31, 31 formed by the insertion guide portions 33, 33 and the engaging portions 34, 34 with which the projecting portions 16, 16 on the connecting portion 14 can engage with each other are arranged on the central axis of the pipe 30. In contrast, they are provided symmetrically to each other. As shown in detail in FIG.
Each engaging groove 31 has a slope surface 31a, 31b on the tip side.
Is formed, and the slope surface 31c is formed on the base end side.

As shown in FIG. 7, an annular abutting surface 30a that abuts the abutting surface 15 of the connecting portion 14 is formed on the inner peripheral surface of the tip end side of the pipe 30. Also, pipe 3
Hemispherical inward projections 35, 35 that project inward toward the insertion guide portions 33, 33 of the engagement groove 31 are formed in the portion of the distal end pipe 32 that covers the distal end side portion of 0. These inward projections 35, 35 project inward to such an extent that they interfere with the projections 16, 16 of the connecting portion 14 inserted into the insertion guides 33, 33 in an engaged state.
When they interfere with 6, they are elastically deformed outward by these protrusions 16, 16 and allow the protrusions 16, 16 to be inserted further. As shown in FIG. 3, a large diameter portion 37 is formed at the tip of the tip pipe 32 to prevent the tube 36 from moving forward.

As shown in FIG. 3, a holding member 38 for holding the rotation locking member 4 is integrally provided at the base end of the pipe 30. FIG. 9 (cross-sectional view taken along line D-D in FIG. 3)
As shown in FIG. 3, the holding member 38 is formed with two holes 39 and 40. These holes 39 and 40 are used for the sheath 29.
Extends in a direction perpendicular to the central axis of the. Holding member 3
A snap-fit member 42 that is detachably connected to the operation unit 5 is integrally provided on the base end side of 8. 3 and 10 (a cross-sectional view taken along the line EE of FIG. 9)
As shown in, a ring-shaped rubber packing 41 is attached to the outer periphery of the tip end portion of the snap fit member 42.

As shown in FIG. 2, an abutting surface 98 is formed on the tip side of the snap fit member 42. Further, two cantilevered snap fit arms 43, 43 are formed on the snap fit member 42, and a projection 44 is provided on the outer peripheral surface of the tip end portion of each snap fit arm 43. The protrusion 44 has a slope surface 4 on the tip side.
5 is formed, and the slope surface 46 is formed on the base end side.

As shown in FIGS. 3, 9, 10 and 11 (a view in the direction of arrow F in FIG. 3), a knob 48 made of an electrically insulating material is integrally provided on the outer periphery of the holding member 38. Has been. The knob 48 has a rotation operation part 47 for rotating the insertion part 3 with respect to the operation part 5. The knob 48 is provided with a cleaning mouthpiece 49 communicating with the hole 40 of the holding member 38, and the cleaning mouthpiece 49 is attached with a rubber plug 50 that closes the cleaning mouthpiece 49 so as to be openable and closable. Further, the knob 48 is formed with a hole 51 communicating with the hole 39 of the holding member 38 at an insertion opening portion into which the rotation locking member 4 is inserted. Also, knob 4
8 and the outer periphery of the insertion opening of FIG.
(A cross-sectional view taken along the line GG of FIG. 1), a slope surface 52 extending in a direction forming a predetermined angle with respect to the axial center direction of the hole 51 and a cylindrical surface 53 extending in the axial center direction of the hole 51. Has been formed. FIG. 13 (cross-sectional view taken along the line H-H in FIG. 12)
As shown in detail in FIG.
An engagement groove (attachment / detachment portion) 56 having 4, 55 is formed.

As shown in FIGS. 3, 9, 11, and 12, the rotation locking member 4 detachably attached to the knob 48 is inserted into the hole 39 of the holding member 38 and rotatably held. Locking member 57, a ring-shaped rubber packing 58 that comes into contact with the inner surface of the hole 51 of the knob 48, and the locking member 57.
And a lever member 60 made of an electrically insulating material and having a lever portion 59 for rotating. The lever member 60 is fixed to the locking member 57 with a screw 61. The upper part of the screw 61 is covered with a cover 62 made of an electrically insulating material. A cylindrical portion 63 is formed on the tip side of the locking member 57, and a pair of cam grooves 64 and 65 facing each other are formed in the cylindrical portion 63 as shown in FIG.

FIG. 14 (cylindrical portion 63 viewed from the direction I in FIG. 2)
As shown in FIG. 2), the cam groove 64 is formed in the drive shaft 2
A circular hole portion 66 having an inner diameter larger than the outer diameter of 4;
A slope portion 68 extending obliquely upward from the hole portion 66 for rotating the drive shaft 24, and a slope portion 68 to the cylindrical portion 6
Drive shaft 24 extending perpendicularly to the axial direction of
Parallel groove portion 6 engageable with the two parallel flat surfaces 26, 26 of
7 and a relief portion 69 for avoiding interference with the drive shaft 24. In this case, the hole 66 is formed so that its central axis can coincide with the central axis of the sheath 29 by the rotation of the cylindrical portion 63. The cam groove 65 is also the cam groove 64.
Similarly to, the hole 70, the parallel groove 71, and the slope 7
2 and the escape portion 73.

As shown in FIG. 12, the lever member 60 is provided with an elastically deformable arm 74 extending downward. At the tip of the arm 74, the cylindrical surface 5 of the knob 48 is
A hemispherical portion (attachment / detachment portion) 75 that engages with the engagement groove 56 of No. 3 is formed.

As shown in FIG. 15, the operating section 5 detachably attached to the treatment section drive unit 2 and the insertion section 3 has a substantially L-shaped fixed handle 76 made of an electrically insulating material and a movable body. It consists of a handle 77. The movable handle 77 is rotatably connected to the fixed handle 76 via a fulcrum pin (fulcrum member) 78 provided at an L-shaped bent portion of the fixed handle 76. Fixed handle 7
A ring 79 for inserting fingers is formed at the end of 6, and a ring 80 for inserting fingers is formed at the end of the movable handle 77. Further, a tubular insertion portion connecting portion 81 is provided on the upper portion of the fixed handle 76. Insertion part connection part 81
A large-diameter portion 82 for accommodating the rubber packing 41 of the insertion portion 3 and a small-diameter portion 83 provided behind the large-diameter portion 82 and accommodating the snap-fit member 42 are formed inside. An abutment surface 99 is formed between the large diameter portion 82 and the small diameter portion 83.

An electrode pin 84 for passing a high-frequency current and a cover 85 made of an electrically insulating material and covering the electrode pin 84 are fixed to the insertion portion connecting portion 81. A rubber cap 86 is detachably provided on the upper portion of the fixed handle 76. The rubber cap 86 has a hole 86 a through which the drive shaft 24 of the treatment section drive unit 2 is inserted and an annular groove 87.

As shown in FIGS. 15 and 16 (viewed in the direction of arrow J in FIG. 15), a connection groove into which the coupling portion 27 of the treatment portion drive unit 2 is inserted and engaged with the upper portion of the movable handle 77. 88 is formed. The upper portion of the connection groove 88 is formed as an inlet hole portion 89 having a diameter substantially the same as the diameter of the coupling portion 27, and a guide hole portion 90 for guiding the coupling portion 27 downward is provided in the vertical direction in the inner portion of the connection groove 88. It is provided. Also,
At the front edge of the lower portion of the connection groove 88, an engaging portion 91 that is set to have a width smaller than the diameter of the joining portion 27 and engages with the joining portion 27 is formed. Further, in the fixed handle 76 and the movable handle 77, flat abutting portions 92 and 93 are formed in the vicinity of the pivotally attached portions, respectively.
When the abutting portions 92 and 93 contact each other, the movement of the movable handle 77 in the closing direction is restricted. Further, a mushroom-shaped projection 94 is provided on the upper portion of the movable handle 77 so as to engage with the groove 87 of the rubber cap 86 in a disengageable manner when the movable handle 77 is operated in the opening direction.

Next, the case of assembling the surgical treatment tool 1 of this embodiment will be described.

As shown in FIG. 2, in the state where the surgical treatment tool 1 is disassembled into its constituent parts, first, the rotary locking member 4 is assembled to the insertion portion 3. In this case, the cylindrical portion 63 of the rotation locking member 4 is inserted into the hole 39 of the holding member 38 of the insertion portion 3. As a result, the hemispherical portion 75 of the lever member 60 is moved to the knob 4
8 slides on the slope surface 52 and the cylindrical surface 53 of the roller 8, and the arm 74 of the lever member 60 elastically deforms outward. Here, when the rotation locking member 4 is further pushed in, the hemispherical portion 75 engages with the engaging groove 56 of the knob 48, and the elastic deformation of the arm 74 is released. In this state, when the lever portion 59 of the lever member 60 is rotated to the position shown by the chain double-dashed line in FIG. 11, the arm 74 elastically deforms and the hemispherical portion 75 rides on the protrusion 55 of the engaging groove 56. Beyond 2 in Figure 13
Move to the position indicated by the dotted line. This allows the hemispherical portion 7
5 is locked in the engagement groove 56, and the rotation locking member 4 is inserted in the insertion portion 3
Fixed against. At this time, the cam grooves 64, 65
The common central axis x of each of the hole portions 66 and 70 and the central axis y of the sheath 29 are in a state of being aligned.

Next, the insertion portion 3 to which the rotation locking member 4 is attached is assembled to the operation portion 5. In this case, the snap fit member 42 of the insertion portion 3 is inserted from the large diameter portion 82 of the insertion portion connection portion 81 of the fixed handle 76 into the small diameter portion 83. At this time, the protrusion 4 of the snap-fit member 42
4, 44 are smoothly inserted into the small diameter portion 83 from the large diameter portion 82 by the guide of the slope surfaces 45, 45, and move while sliding in the small diameter portion 83. The snap fit arms 43, 43 are elastically deformed inward by the force received from the inner surface of the small diameter portion 83.

When the snap fit member 42 is further pushed in from this state, the abutting surface 98 of the snap fit member 42 and the abutting surface 99 of the insertion portion connecting portion 81 abut. At this time, the protrusions 44, 44 are projected to the outside of the small diameter portion 83, and the elastic deformation of the snap fit arms 43, 43 is released.

Next, the treatment section drive unit 2 is assembled to the assembly in which the insertion section 3 and the operation section 5 are integrated. First,
Operate the movable handle 77 in the opening direction to move the movable handle 77.
The protrusion 94 elastically deforms the portion of the rubber cap 86 near the groove 87 to engage the protrusion 94 with the groove 87. At this time, the movable handle 77 is held at the position shown by the solid line in FIG. 17, and the inlet hole 89 of the movable handle 77 substantially coincides with the central axis y of the sheath 29. That is, the movable handle 77 is in a specific posture that allows correct assembly. Here, when the coupling portion 27 of the treatment portion drive unit 2 is inserted into the sheath 29 from the distal end side of the sheath 29, the sloped surface 19 (20) of each of the protrusions 16 and 16 of the connection portion 14 and the pipe 30.
The sloped surface 31 a (31 b) of the engaging groove 31 of the contact groove 31 comes into contact with each other, and the protrusions 16 and 16 are inserted into the insertion guide portion 3 of the engaging groove 31.
You will be guided to 3. When the treatment section drive unit 2 is further pushed, the coupling section 27 is inserted into the inlet hole section 89 of the movable handle 77. From this state, when the movable handle 77 is rotated in the closing direction to the position shown by the chain double-dashed line in FIG. 17 while pushing in the treatment section drive unit 2, the portion of the rubber cap 86 near the groove 87 is elastically deformed. Protrusion 9
4 is disengaged from the groove 87, and the connecting portion 27
Is guided below the connection groove 88 along the guide hole 90 and is engaged with the engaging portion 91. Also, by this operation,
The protrusions 16 and 16 guided by the insertion guide portion 33 are
By advancing along the insertion guide portion 33, the inner protrusions 35, 35 of the distal end pipe 32 are elastically deformed to get over the inner protrusions 35, and move to a position within the engagement groove 31 shown in FIG. 19A. At this time, the abutting surface 15 of the connecting portion 14 abuts the abutting surface 30a of the pipe 30. In this state, unless each projection 16 of the treatment section drive unit 2 applies a sufficient forward force to the treatment section drive unit 2 to elastically deform the inner protrusions 35, 35 of the distal end pipe 32, The treatment section drive unit 2 does not move forward.

Next, when the lever portion 59 of the lever member 60 is rotated from the position shown by the chain double-dashed line in FIG. 11 to the position shown by the solid line, the hemispherical portion 75 gets over the projections 55, 54 of the engaging groove 56. 13 to move to the position shown by the solid line, and the rotation locking member 4 is fixed to the insertion portion 3. At this time, each protrusion 1
6 and 16 and the engagement groove 31 and the cylindrical cam groove 6
The positional relationship between 4, 65 and the drive shaft 24 changes from the state shown in FIG. 19 (a) to the state shown in FIG. 19 (c) through the state shown in FIG. 19 (b). That is, when the lever member 60 is rotated, the cylindrical portion 63 is rotated and the cylindrical cam groove 6 is rotated.
The slope portions 68, 72 of 4, 65 rotate the drive shaft 24 about its central axis. As a result, the treatment section drive unit 2 rotates with respect to the insertion section 3, and the protrusions 16 and 16 are guided to the locking section 34 of the engagement groove 31. At this time, even if the protrusions 16 and 16 are slightly displaced to the front with respect to the locking portion 34, the slope surfaces 21 and 31c cause the protrusions 1 to move.
6, 16 are guided to the locking portion 34.

In the state shown in FIG. 19C, each protrusion 1
6, 16 are located in the locking portion 34 of the engaging groove 31, and the protrusion 1
The abutting surface 17 of 6 abuts against the front surface of the locking portion 34. Also, two parallel planes 26, 2 of the drive shaft 24
6 is located in the parallel groove portions 67 and 71 of the cylindrical cam grooves 64 and 65. Therefore, in the treatment section drive unit 2, the movement of the treatment section drive unit 2 in the front-rear direction with respect to the insertion section 3 is restricted by the engagement of the connection section 14 with the pipe 30, and the treatment section drive unit 2 is inserted by being positioned in the cylindrical cam grooves 64, 65. Rotation with respect to the portion 3 is restricted.

In the surgical treatment tool 1 assembled as described above, when the movable handle 77 is rotated, the drive shaft 24 moves back and forth through the connecting portion 27, and the drive member 23.
The gripping members 6 and 6 are opened and closed via. Also, the knob 48
When the rotary operation section 47 is rotated, the insertion section 3 and the treatment section drive unit 2 rotate with respect to the operation section 5.

In this embodiment, at the time of assembly,
The position where the movable handle 77 abuts the abutting surface 15 of the connecting portion 14 and the abutting surface 30a of the pipe 30 from the correct assembly position (the position shown by the solid line in FIG. 17) (FIG. 17).
The amount L (see FIG. 17) of moving to the position indicated by the two-dot chain line is set smaller than the length m (see FIG. 8) of the engagement groove 31. Therefore, the protrusion 16 is engaged with the engaging groove 31.
The coupling portion 27 is not coupled to the movable handle 77 unless it is inserted into the movable handle 77.

Further, in this embodiment, when the treatment section drive unit 2 is to be assembled while the movable handle 77 is not rotated in the opening direction during assembly, the state shown in FIG. 18 is obtained. That is, the end surface of the coupling portion 27 abuts on the front surface of the connection groove 88 of the movable handle 77. At this time, the movable handle 77 is restricted from moving in the closing direction due to the abutting of the abutting portions 92 and 93, so that the treatment portion drive unit 2 can be pushed further toward the hand side from the state shown in FIG. Can not. Further, at this time, since the protrusion 16 is in a position where it cannot be engaged with the locking portion 34 of the engagement groove 31, the treatment portion drive unit 2 is not connected to the insertion portion 3.

A state in which the connecting portion 27 is assembled by the correct assembling method is shown by a chain double-dashed line (or FIG. 3) in FIG. In this embodiment, the displacement amount n is set to be larger than the maximum movement amount of the drive shaft 24 that is moved forward to drive the grip members 6 and 6. Therefore, when trying to assemble the gripping members 6 and 6 in an open state, the protrusion 16 cannot engage with the locking portion 34, and the treatment section drive unit 2 is not connected to the insertion section 3. That is, unless the treatment section drive unit 2 is connected to the operation section 5,
It is not connected to the insertion part 3.

Next, the case of disassembling the assembled surgical treatment tool 1 will be described. First, when the lever portion 59 of the lever member 60 is rotated from the position shown by the solid line in FIG. 11 to the position shown by the chain double-dashed line, the hemispherical portion 75 rides over the projections 54, 55 of the engagement groove 56, and as shown in FIG. Move to the position indicated by the chain double-dashed line. Even in this state, the rotation locking member 4
Remains fixed to the insertion portion 3. Further, in this state, the positional relationship between the protrusions 16 and 16 and the engagement groove 31 and the positional relationship between the cylindrical cam grooves 64 and 65 and the drive shaft 24 are as shown in FIG. If the gripping members 6 and 6 are gripped from this state and the treatment section drive unit 2 is rotated with respect to the insertion section 3, the state shown in FIG.
After that, when the movable handle 77 is opened to the position shown by the solid line in FIG. 17 and the treatment section drive unit 2 is pulled toward the distal end side, the protrusions 16 and 16 cause the inner protrusions 3 of the distal end pipe 32 to project.
5 and 35 are elastically deformed to get over and move forward along the insertion guide portion 33, and the drive shaft 24
And the connecting portion 27 is the hole portion 70 of the cylindrical cam groove 65, 64,
After passing through 66, the treatment section drive unit 2 is separated from the insertion section 3.

Next, in order to separate the rotation locking member 4 and the insertion portion 3 from the operation portion 5, the insertion portion 3 is pulled forward with respect to the operation portion 5. As a result, the protrusions 44, 44 of the snap-fit member 42 are inserted into the small diameter portion 83 by the guide of the slope surfaces 46, 46 and move while sliding in the small diameter portion 83. At this time, the snap fit arms 43, 43 elastically deform inward. Further pulling the insertion part 3 forward,
The protrusions 44, 44 project to the outside of the small diameter portion 83, and the elastic deformation of the snap fit arms 43, 43 is released. That is, the rotation locking member 4 and the insertion portion 3 are separated from the operation portion 5.

Next, in order to separate the rotation locking member 4 from the insertion portion 3, the rotation locking member 4 is pulled upward with respect to the insertion portion 3. As a result, the arm 74 elastically deforms to release the engagement between the hemisphere portion 75 and the engagement groove 56, and the hemisphere portion 75 moves while sliding on the cylindrical surface 53 and the slope surface 52 of the knob 48. When the locking member 4 is further pulled upward in this state, the rotary locking member 4 is separated from the insertion portion 3 as shown in FIG.

As described above, according to this embodiment, the disassembling / assembling work between the respective constituent elements can be easily performed in a short time. Further, since the rotation locking member 4 that fixes the treatment section drive unit 2 in the rotation direction with respect to the insertion section 3 can be disassembled, and a screw-type coupling mechanism is not provided in the connection section between each component, Eliminates the parts that are easily soiled and difficult to wash, such as the ridges and valleys of the screws of the screw type coupling mechanism. Therefore, the surgical treatment tool 1 of the present embodiment is suitable as a medical device that requires a high degree of cleanliness.

Further, in this embodiment, the engaging portion 27 is not coupled to the movable handle 77 unless the protrusion 16 is inserted into the engaging groove 31. Further, the treatment section drive unit 2 is not connected to the insertion section 3 unless it is connected to the operation section 5. Therefore, there is no need to repeat assembly and disassembly many times due to erroneous assembly. Further, due to the excessive operating force in the misassembled state, the pipe 30, the connecting portion 14,
It is possible to prevent the coupling portion 27 and the like from being damaged.

20 to 23 show a second embodiment of the present invention. This embodiment is different from the first embodiment only in the method of connecting the insertion portion 3 and the operation portion 5, and therefore only the portions different from the first embodiment will be described below.

As shown in FIG. 20, a drive shaft support member 105 is integrally provided on the base end side of the holding member 38. An abutment surface 106 is formed on the drive shaft support member 105. A cylindrical portion 107 into which the drive shaft 24 is inserted is formed on the base end side of the drive shaft support member 105.

As shown in FIGS. 20 to 22, the knob 48 is detachably provided with a deformable rubber spring (urging means) 108 made of an elastic material such as synthetic rubber. A guide member (pressing portion) 110 made of an electrically insulating material is detachably provided on the rubber spring 108. The guide member 110 has a guide hole 10 formed in the knob 48.
It is supported by 9 so as to be movable only in the vertical direction (vertical direction in FIGS. 20 and 22).

As shown in detail in FIG. 20, the guide member 1
An operating portion engaging / disengaging member (engaging / disengaging member) 111 is integrally provided at the end of 10. A support portion 112 extending rearward is formed on the operation portion engaging / disengaging member 111, and an engaging protrusion 113 is formed at the tip of the support portion 112. Engaging protrusion 11
3, a slope surface 114 and an abutting surface 115 are formed.

As shown in FIG. 21, an insertion portion connecting portion 116 is provided above the fixed handle 76. The rubber packing 4 of the insertion part 3 is provided inside the insertion part connection part 116.
1 is accommodated, and a small diameter portion 118 located behind the large diameter portion 117 and accommodating the cylindrical portion 107 of the drive shaft support member 105 is formed. Large diameter part 117
An abutment surface 119 that abuts the abutment surface 106 of the drive shaft support member 105 is formed between the and the small diameter portion 118. A cylindrical portion 120 having an inner diameter larger than that of the large diameter portion 117 is formed in front of the large diameter portion 117.
An engaging portion 121 that engages with the engaging protrusion 113 is formed at the tip of 0. As shown in detail in FIG. 20, the engaging portion 1
21 is formed with a slope surface 122 and an abutting surface 123 that abuts the abutting surface 115 of the engaging projection 113.

Next, the operation of the second embodiment will be described.

In order to attach the insertion section 3 to the operation section 5,
First, the cylindrical surface 107 of the drive shaft support member 105 of the insertion portion 3
Is the large diameter portion 1 of the insertion portion connection portion 116 of the fixed handle 76.
It is inserted from 17 into the small diameter portion 118. At this time, the slope surface 114 of the engagement protrusion 113 and the slope surface 122 of the engagement portion 121 come into contact with each other, and the guide member 110 and the operation portion engagement / disengagement member 111 guide the knob 48 of the knob 48 against the elastic force of the rubber spring 108. Guided by the hole 109, FIG.
Move up above. When the insertion portion 3 is further pushed into the operation portion 5, the abutting surface 10 of the drive shaft support member 105 is
6 abuts the abutting surface 119 of the insertion portion connecting portion 116. At this time, the restoring force of the rubber spring 108 causes the guide member 110 and the operating portion engaging / disengaging member 111 to move to the guide hole 10
It is guided by 9 and moves downward in FIG. That is, as shown in FIG. 20, the abutting surface 115 of the engaging protrusion 113 and the abutting surface 123 of the engaging portion 121 abut against each other, and the assembling of the insertion portion 3 to the operating portion 5 is completed.

Next, the case where the insertion section 3 is separated from the operation section 5 will be described. First, in the state of FIG. 20, when the guide member 110 is pushed upward against the elastic force of the rubber spring 108, the operation portion engagement / disengagement member 111 also moves upward, and the engagement protrusion 113 and the engagement portion 121 are engaged. The combined state is released. From this state, when the insertion portion 3 is moved forward with respect to the operation portion 5 while pressing the guide member 110 upward, the insertion portion 3
Is separated from the operation unit 5.

In the first embodiment, it is structurally inconvenient to assemble or separate the insertion section 3 from the operation section 5 with the treatment section drive unit 2 assembled to the insertion section 3. It is possible. This is because the snap fit arm 43 cannot be elastically deformed inward when the drive shaft 24 is inserted into the snap fit member 42 of the insertion portion 3. However, in the configuration of the present embodiment, it is possible to assemble the insertion section 3 to the operation section 5 or separate it from the operation section 5 with the treatment section drive unit 2 assembled to the insertion section 3. That is, when the assembly formed by assembling the treatment section drive unit 2 to the insertion section 3 using the rotation locking member 4 is assembled to the operation section 5 or separated from the operation section 5, the insertion described in the present embodiment is performed. In addition to the disassembling / assembling work of the portion 3 and the operating portion 5, the engaging / disengaging work of the coupling portion 27 of the treatment portion drive unit 2 and the connection groove 88 of the movable handle 77 described in the first embodiment may be performed. . In addition,
At this time, do not rotate the movable handle 77 in the opening direction,
When the assembly is pushed into the operating portion 5 to be assembled, the abutment of the abutting portions 92 and 93 restricts the movement of the movable handle 77 in the closing direction.
End face of the movable handle 77 hits the front surface of the connection groove 88, and the engaging projection 113 of the insertion portion 3 and the engaging portion 1 of the operating portion 5
The assembly cannot be pushed into the position where it engages with 21. That is, erroneous assembly is prevented.

As described above, according to the present embodiment, only the treatment section drive unit 2 or the operation section 5 can be easily attached and detached in a short time. Therefore, the damaged treatment section drive unit 2 or the operation section 5 is replaced, or the treatment section drive unit 2 or the operation section 5 having different shapes and functions is replaced.
Can be quickly replaced.

24 to 28 show a third embodiment of the present invention. The surgical treatment tool according to the present embodiment includes the insertion portion 3
Only the means for restricting the rotation of the treatment section drive unit 2 with respect to is different from the second embodiment. Therefore, in the following, the second
Only the parts different from the embodiment will be described.

As shown in FIG. 25, a lever member 129 made of an electrically insulating material is rotatably attached to the knob 48 via a pin 128. Lever member 12
9 includes a columnar fork member (rotary locking member) 130.
Are provided integrally.

FIG. 27 (a sectional view taken along the line NN in FIG. 25)
As shown in FIG. 5, a long leg portion (leg portion) 131 and a short leg portion (leg portion) 132 are formed at the tip of the fork member 130. Between the long leg portion 131 and the short leg portion 132, a parallel groove 133 that can engage with the two parallel flat surfaces 26, 26 of the drive shaft 24 is formed. Further, recesses (attachment / detachment portions) 134, 134 are formed on the side surface of the lever member 129. The holding member 38 and the knob 4 are arranged so that the fork member 130 does not interfere with the holding member 38 and the knob 48 when the fork member 130 rotates together with the lever member 129.
8, elongated holes 135 and 136 are formed as shown in FIG.

Further, the knob 48 is integrally provided with a rubber packing 137 made of an elastic material such as synthetic rubber. The rubber packing 137 keeps the inside of the insertion portion 3 airtight by contacting the lever member 129.
Further, as shown in FIGS. 25 and 27, the rubber packing 137 is formed with ears (removable parts) 138, 138 that engage with the recesses 134, 134 of the lever member 129 in a detachable manner.

Next, the operation of the third embodiment will be described.

When the treatment section drive unit 2 is assembled to the insertion section 3, first, the lever member 129 is rotated upward to the position shown by the chain double-dashed line in FIG. In this case, the lever member 129 may be held at the position shown by the chain double-dashed line in FIG. 25 by a holding means (not shown). In this state, this time, the coupling portion 27 of the treatment portion drive unit 2 is connected to the sheath 29.
The sheath 29 from the tip side of the
The treatment section drive unit 2 is pushed into the insertion section 3 until the abutting surface 15 and the abutting surface 30a of the pipe 30 come into contact with each other. The positional relationship between the protrusion 16 and the engagement groove 31 when the abutting surface 15 and the abutting surface 30a abut each other is shown in FIG. 28 (a).

When the lever member 129 is rotated downward from this state to the position shown by the solid line in FIG. 25, the ear portion 138 of the rubber packing 137 is elastically deformed and the lever member 12 is moved.
The lever member 1 is engaged with the recess 134 of the lever 9 (see FIG. 27).
29 is fixed to the insertion portion 3. At this time, the positional relationship between the protrusions 16 and 16 and the engagement groove 31 and the positional relationship between the fork member 130 and the drive shaft 24 are changed from the state shown in FIG. 28 (a) to the state shown in FIG. 28 (b). The state changes to that shown in FIG. That is, when the lever member 129 is rotated, the long leg portion 131 of the fork member 130 pushes one of the flat surfaces 26 of the drive shaft 24 to rotate the drive shaft 24 around its central axis. Thereby, the protrusion 16 is guided to the locking portion 34 of the engagement groove 31. Then, finally, as shown in FIG.
1, the abutting surface 1 of the protrusion 16 located at the locking portion 34
7 hits the front surface of the locking portion 34. At the same time, the two parallel flat surfaces 26, 26 of the drive shaft 24 engage with the parallel groove 133 of the fork member 130. That is, the treatment section drive unit 2 is assembled to the insertion section 3.

On the other hand, when the treatment section drive unit 2 is separated from the insertion section 3, the lever member 129 is rotated upward to the position shown by the chain double-dashed line in FIG. At this time, the ears 138 of the rubber packing 137 elastically deform, and the engagement between the recesses 134 of the lever member 129 and the ears 138 is released. After that, the grasping members 6 and 6 of the treatment section drive unit 2 are grasped, the treatment section drive unit 2 is rotated with respect to the insertion section 3, and the state shown in FIG. In this state, if the treatment section drive unit 2 is pulled toward the distal end side, the treatment section drive unit 2 can be separated from the insertion section 3.
Note that, also in the present embodiment, as in the second embodiment,
The disassembling / assembling order of each of the treatment section drive unit 2, the insertion section 3, and the operation section 5 is not limited.

As described above, in the present embodiment, the fork member 130 for restricting the rotation of the treatment section drive unit 2 with respect to the insertion section 3 is rotatably attached to the insertion section 3 via the lever member 129. Therefore, the fork member 1
The loss of 30 is prevented. Further, according to the present embodiment,
Disassembly and assembly work between each component can be done easily in a short time. Further, the surgical treatment tool of the present embodiment has no portions that are difficult to wash, and thus is suitable as a medical device that requires a high degree of cleanliness. Particularly, the treatment section drive unit 2 is inserted into the insertion section 3
When the lever member 129 is rotated upward in the state of being separated from the above, the cleaning property in the insertion portion 3 becomes good.

29 to 34 show a fourth embodiment of the present invention. The surgical treatment tool according to the present embodiment includes the insertion portion 3
Only the means for restricting the rotation of the treatment section drive unit 2 with respect to is different from the second embodiment. Therefore, in the following, the second
Only the parts different from the embodiment will be described.

In the first to third embodiments, the tube 28 made of an electrically insulating material is provided near the base end of the drive shaft 24 of the treatment section drive unit 2, but in the present embodiment it is provided. Not not.

As shown in FIGS. 29 and 30, a rotation locking member 141 is integrally provided at the base end of the pipe 30 of the insertion portion 3. The rotation locking member 141 is formed with an abutting surface 142 and two cantilevered snap fit arms 143, 143. A protrusion 144 is provided on the inside of the tip of each snap-fit arm 143. The protrusion 144 is formed with a parallel portion 145 capable of engaging with the two parallel flat surfaces 26, 26 of the drive shaft 24.

An insertion portion holding portion 146 is provided on the upper portion of the fixed handle 76. Inside the insertion portion holding portion 146, a large diameter portion 147 in which the rubber packing 41 of the insertion portion 3 is stored and a snap fit arm 143 of the rotation locking member 141 provided behind the large diameter portion 147 are stored. A small diameter portion 148 is formed. An abutting surface 158 is formed between the large diameter portion 147 and the small diameter portion 148.
Further, a ring-shaped rubber packing 149 through which the drive shaft 24 is inserted is provided at the base end of the insertion portion holding portion 146. In the present embodiment, the fixed handle 76 is formed with the engagement portion 121 that engages with the engagement protrusion 113 of the operation portion engagement / disengagement member 111 of the insertion portion 3.

At the upper portion of the fixed handle 76, walls 150, 15 covering the vicinity of the connection groove 88 of the movable handle 77 from both sides.
0 is formed. Pins 15 on the walls 150, 150
A cover 152 made of an electrically insulating material is rotatably attached via the connector 1. The cover 152 covers the upper portion of the movable handle 77 near the connection groove 88.
As shown in detail in FIG. 31B (cross-sectional view taken along the line P-P in FIG. 29), the cover 152 has a hemispherical projection 153.
153 is formed. Also, the walls 150, 150 have holes 154, 154 engageable with the protrusions 153, 153.
Are formed.

FIG. 34 (sectional view taken along the line RR of FIG. 33)
Fixed handle 76 and movable handle 7 as shown in FIG.
7 is provided with a holding mechanism 155 for holding the movable handle 77 in the correct assembly position. The holding mechanism 155 includes hemispherical projections 156 and 156 formed on the upper side surface of the movable handle 77 and a fixed handle 76.
Annular projection 15 formed inside the walls 150, 150 of the
It consists of 7,157.

Next, the operation of this embodiment will be described.

When assembling the components from the disassembled state, first, the treatment section drive unit 2 is assembled to the insertion section 3. That is, the connecting portion 27 of the treatment portion drive unit 2 is inserted into the sheath 29 from the distal end side of the sheath 29 until the abutting surface 15 of the connecting portion 14 and the abutting surface 30a of the pipe 30 come into contact with each other. Push the drive unit 2 into the insertion portion 3. At this time, each protrusion 1
The positional relationship between 6, 16 and the engaging groove 31 and the positional relationship between the drive shaft 24 and the protrusions 144, 144 are as shown in FIG. In this state, the projections 144, 144 are pushed outward by the drive shaft 24, and the snap fit arms 143, 143 are elastically deformed outward.

From this state, this time, the gripping members 6, 6 of the treatment section drive unit 2 are gripped to treat the treatment section drive unit 2.
When is rotated with respect to the insertion portion 3, the state shown in FIGS. 32 (b) and 30 is obtained. In this state, each protrusion 1
6, 16 are located in the engaging portion 34 of the engaging groove 31, the abutting surface 17 of the protrusion 16 abuts against the front surface of the engaging portion 34, and the two parallel flat surfaces 26, 26 of the drive shaft 24 rotate. The parallel portion 1 of the protrusions 144 and 144 of the locking member 141
45, 145 to engage. That is, the treatment section drive unit 2 is non-rotatably attached to the insertion section 3.

Next, the insertion section 3 to which the treatment section drive unit 2 is assembled is assembled to the operation section 5. First, the movable handle 77 is opened to the correct assembly position (the position shown in FIG. 33). At this time, the wall 150 of the fixed handle 76,
When 150 is elastically deformed to the side, the protrusions 156 and 156 of the movable handle 77 become the protrusions 1 of the fixed handle 76.
After overcoming 57 and 157, the protrusions 156 and 156 are engaged between the protrusions 157 and 157 as shown in FIG. As a result, the movable handle 77 is held at the correct assembly position.

Next, as shown in FIG. 33, the rotation locking member 141 of the insertion portion 3 and the coupling portion 27 of the treatment portion drive unit 2 assembled to the insertion portion 3 are connected to the large diameter portion 147 of the insertion portion holding portion 146. To the small diameter portion 148. Then, while further pushing the insertion portion 3 while the coupling portion 27 is inserted into the inlet hole portion 89 of the movable handle 77,
The movable handle 77 is rotated in the closing direction. This allows
The walls 150, 150 of the fixed handle 76 are elastically deformed, and the engagement between the protrusions 156, 156 and the protrusions 157, 157 is released. From this state, when the insertion portion 3 is further pushed until the abutting surface 158 of the insertion portion holding portion 146 and the abutting portion 142 of the rotation locking member 141 come into contact with each other, the coupling portion 27
Is engaged with the engaging portion 91, and the engaging protrusion 113 of the operating portion engaging / disengaging member 111 of the insertion portion 3 and the engaging portion 121 of the operating portion 5 engage in the same manner as in the second embodiment. , Assembly is completed.

In this assembled state, the snap fit arm 143 has the small diameter portion 148 of the insertion portion holding portion 146.
Since it is stored inside, it cannot be elastically deformed to the outside. That is, the treatment section drive unit 2 is maintained while the rotation with respect to the insertion section 3 is restricted.

Next, the disassembly work will be described. First,
The insertion section 3 with the treatment section drive unit 2 assembled is separated from the operation section 5. In this case, in a state where the movable handle 77 is opened to the position shown in FIG. 33, the insertion section 3 is separated from the operation section 5 by the same method as in the second embodiment. After that, the treatment section drive unit 2 is separated from the insertion section 3 by the procedure reverse to that at the time of assembly.

As described above, in the surgical treatment tool of this embodiment, as in the third embodiment, the disassembling / assembling work between the respective constituent elements can be easily performed in a short time. Further, the surgical treatment tool of the present embodiment has no portions that are difficult to wash, and thus is suitable as a medical device that requires a high degree of cleanliness. In particular, when the lever member 129 is rotated upward while the treatment section drive unit 2 is separated from the insertion section 3, the inside of the insertion section 3 is easily cleaned.

Further, in this embodiment, the projections 153 and 153 of the cover 152 and the holes 154 and 15 of the walls 150 and 150 are provided.
By engaging with 4, the cover 152 is always held at the position shown by the solid line in FIG. Therefore, the drive shaft 24 of the treatment section drive unit 2 is electrically insulated from the operator. Therefore, the tube 28 as shown in the first to third embodiments is unnecessary. Further, in the present embodiment, the cover 152 is rotated upward to the position shown by the chain double-dashed line in FIG. 29, so that the vicinity of the connection groove 88 of the movable handle 77 can be easily cleaned.

35 to 37 show a fifth embodiment of the present invention. This embodiment is different from the fourth embodiment only in the connecting portion between the insertion portion 3 and the operation portion 5. Therefore,
Only parts different from the fourth embodiment will be described below.

As shown in FIG. 35, a guide hole 161 is formed in the knob 48. Further, an operating portion engaging / disengaging member (engaging / disengaging member) 162 movable along the guide hole 161 is attached to the knob 48. The operating portion engaging / disengaging member (engaging / disengaging member) 162 is supported by the knob 48 so as to be movable only in the vertical direction in FIGS. 35 and 37 (cross-sectional views taken along the line TT in FIG. 35). ing.

In order to regulate the downward movement of the operating portion engaging / disengaging member 162, one end of the operating portion engaging / disengaging member 162 is provided with the state shown in FIG.
As shown in, the large diameter portion 163 is formed. Note that in the state shown in FIG. 37, the large diameter portion 163 is the knob 4
8, the operating portion engagement / disengagement member 162 is located at the lower limit position. As shown in FIG. 35, a slope surface 164 and an abutting surface 165 are formed at the other end of the operating portion engaging / disengaging member 162. In addition, the operating portion engaging / disengaging member 1
A notch 166 is formed in the middle portion of 62. Further, a lever 167 rotatably attached to the knob 48 is located in front of the operating portion engaging / disengaging member 162. At one end of the lever 167, a pressing portion 168 for the operator to operate with a finger is formed. An engaging portion 169 is formed at the other end of the lever 167, and the engaging portion 169 engages with the notch 166. Groove 1 on the outer circumference of knob 48
70 is formed, and the groove 170 is provided with a rubber ring (biasing means) 171 for pressing the operating portion engaging / disengaging member 162 inward (downward in FIG. 35). The rubber ring 171
Is made of an elastic material such as synthetic rubber.

An annular engaging portion 172 capable of engaging with the operating portion engaging / disengaging member 162 is formed at the tip of the upper portion of the fixed handle 76. The engaging portion 172 has a slope surface 173 and an abutting surface 174.

Next, the operation of this embodiment will be described.

When the insertion portion 3 is assembled to the operation portion 5, the insertion portion 3 is attached to the operation portion 5 with the slope surface 164 of the operation portion engagement / disengagement member 162 in contact with the slope surface 173 of the engagement portion 172. Push it against. As a result, the operating portion engagement / disengagement member 162 is guided by the guide hole 161 of the knob 48 and moves outward (upward in FIG. 35) against the elastic force of the rubber ring 171. When the insertion portion 3 is further pushed in as it is, the abutting surface 1 of the rotation locking member 141 is pushed.
42 and the abutting surface 158 of the insertion portion holding portion 146, the operating portion engaging / disengaging member 162 is moved to the position shown in FIGS. 35 and 37 by the restoring force of the rubber ring 171, and the operating portion engaging / disengaging portion is released. The abutting surface 165 of the member 162 and the abutting surface 174 of the engaging portion 172 abut. That is, the insertion part 3 is completely assembled to the operation part 5.

When the insertion portion 3 is separated from the operation portion 5, the pressing portion 168 of the lever 167 is pushed inward (downward in FIG. 35) to rotate the lever 167. As a result, the operation portion engagement / disengagement member 162 is guided by the guide hole 161 against the elastic force of the rubber ring 171 by the action of the engagement portion 169 that engages with the notch 166, and outside (upper side in FIG. 35). Moved to. As a result, the engagement between the operation section engagement / disengagement member 162 and the engagement section 172 is released, and the insertion section 3 can be separated from the operation section 5. Therefore, according to this embodiment, the same effect as that of the fourth embodiment can be obtained.

38 to 41 show a sixth embodiment of the present invention. This embodiment is different from the fourth embodiment only in the connecting portion between the insertion portion 3 and the operation portion 5. Therefore,
Only parts different from the fourth embodiment will be described below.

As shown in FIG. 38, the knob 48 has a cylindrical portion 176 formed therein. As shown in FIGS. 39 and 40, two arms 177, 177 are provided from the cylindrical portion 176.
Extends laterally. These arms 177,177
Connects the rotation operating portion 47 to the cylindrical portion 176. Two cantilevered snap-fit arms (biasing means) 178, 178 extend forward from the base end side of the cylindrical portion 176. A pressing portion 179 for the operator to operate with a finger is formed on the outer peripheral surface of the tip of each snap-fit arm 178. Further, on the outer peripheral surface of each snap fit arm 178, a projection (engagement member) 180 is provided so as to project rearward of the pressing portion 179. A slope surface 181 and an abutting surface 182 are formed on the protrusion 180.

An annular engaging portion 183 capable of engaging with the protrusions 180, 180 is formed at the tip of the upper portion of the fixed handle 76. The engaging portion 183 has a slope surface 184 and an abutting surface 185.

Next, the operation of this embodiment will be described.

When the insertion portion 3 and the operating portion 5 are assembled, the slope surface 181 of each projection 180 is engaged with the engagement portion 183.
The insertion portion 3 is pushed into the operation portion 5 while being in contact with the slope surface 184. As a result, each snap fit arm 178 elastically deforms inward and each protrusion 180 moves inward. When the insertion portion 3 is further pushed in as it is, when the abutting surface 142 of the rotation locking member 141 and the abutting surface 158 of the insertion portion holding portion 146 abut, the protrusions 180, 180 are at the positions shown in FIG. And the elastic deformation of each snap fit arm 178 is released, and the abutting surface 182 of each protrusion 180 and the abutting surface 185 of the engaging portion 183 abut. That is, the insertion part 3 is completely assembled to the operation part 5.

When the insertion portion 3 is separated from the operation portion 5, the pressing portion 179 of each snap-fit arm 178 is pushed inward to elastically deform each snap-fit arm 178 inward and each projection 180 is inwardly moved. Move towards. As a result, the engagement between each protrusion 180 and the engaging portion 183 is released, and the insertion portion 3 can be separated from the operation portion 5. Therefore, according to this embodiment, the same effect as that of the fourth embodiment can be obtained.

According to the above-described first to sixth embodiments, the following various configurations can be obtained.

(Supplementary Note 1) An insertion part to be inserted into the body, an operation part installed at the proximal end of the insertion part, a treatment part installed at the tip of the insertion part for treating a living body, and an operation part of the operation part. An operating force converting means for converting the operating force into a forward / backward movement, a drive shaft for transmitting the forward / backward movement from the operating force converting means to the distal end portion, and the treatment portion are supported, and the forward / backward movement of the drive shaft is aforesaid. A surgical treatment instrument having a treatment section drive unit including a treatment section support means for converting into movement of a treatment section, comprising a rotation locking means for locking the drive shaft in a rotational direction with respect to the insertion section. The surgical treatment tool characterized in that the rotation locking means is rotatably installed in the insertion portion.

(Supplementary Note 2) The surgical treatment instrument according to Supplementary Note 1, wherein the insertion portion and the treatment portion support means have a connecting portion that locks each other in the advancing / retracting direction of the drive shaft.

(Supplementary Note 3) The surgical treatment instrument according to Supplementary Note 1, wherein the rotation locking means has a connecting portion that is detachable from the insertion portion.

(Supplementary Note 4) The surgical treatment instrument according to Supplementary Note 1, wherein the rotation locking means includes a cylindrical portion forming a cylindrical cam groove that engages with the drive shaft.

(Supplementary Note 5) The surgical treatment instrument according to Supplementary Note 1, wherein the rotation locking means includes at least one foot portion that engages with the drive shaft.

(Supplementary Note 6) The surgical treatment instrument according to Supplementary Note 5, wherein the two foot portions are provided, and one of the foot portions is formed longer than the other foot portion.

(Supplementary Note 7) An insertion portion to be inserted into a living body,
An operating unit having a fixed handle connected to the proximal side of the insertion unit, and a movable handle operable with respect to the fixed handle, and an operable treatment unit arranged on the distal side of the insertion unit. A surgical treatment instrument including a treatment section drive unit having a drive shaft that transmits an operation force of the operation section and a drive unit that receives the movement of the drive shaft and drives the treatment section, wherein: A circumferential engagement portion is provided on the distal end side, and an engagement / disengagement member capable of engagement / disengagement with the engagement portion is provided on the proximal side of the insertion portion, and the engagement / disengagement member is provided at an engagement position with the engagement portion. A surgical treatment instrument comprising an urging means for urging.

(Supplementary Note 8) The surgical treatment instrument according to Supplementary Note 7, wherein a pressing portion for releasing the engagement between the engaging / disengaging member and the engaging portion is provided in the insertion portion.

(Supplementary Note 9) The surgical treatment instrument according to Supplementary Note 7, wherein a fulcrum member for rotatably connecting the movable handle to the fixed handle is provided.

42 to 47 show a seventh embodiment of the present invention. As shown in FIG. 42, the surgical treatment tool according to the present embodiment includes a sheath unit having an insertion portion 203,
The treatment section drive unit is attached to the sheath unit and has a treatment member 204, and the operation body has a fixed operation section 201 and a movable operation section 202 connected to the fixed operation section 201 so as to be openable / closable (rotatable). The insertion section 203 includes a rotary knob 205 and an operation section 20 for disassembly and assembly.
And 6 are provided. Further, the operation unit 206 is provided with a high frequency current cord connecting pin 238.

FIG. 43 (a) shows a sheath unit. As illustrated, a first connecting portion 207 connected to the fixing operation portion 201 is provided at the base end of the insertion portion 203. FIG. 43B shows the treatment section drive unit. As illustrated, the treatment section drive unit includes the treatment member 2
04, a treatment member holding portion 208, and an operation shaft 210 connected to the treatment member 204. Treatment member 204
Is composed of a pair of grips, and is connected to the treatment member holder 208 so that at least one of the grips can be opened and closed. A second connecting portion 209 connected to the sheath unit is provided at the proximal end of the treatment member holding portion 208. A third connecting portion 211 connected to the movable operating portion 202 is provided at the base end of the operating shaft 210. Further, on the operation shaft 210, in front of the third connecting portion 211,
A rotation locking member 212 that is locked to the sheath unit is provided. Although the treatment member 204 has a shape suitable for grasping tissue, the treatment member 204 is not limited to the illustrated shape and may have another shape such as scissors.

FIG. 43C shows the operating body. As shown in the figure, the fixing operation section 201 includes a first holding section 213 that engages with the first connecting section 207 of the sheath unit and a second connecting section 211 that is combined with the third connecting section 211 of the treatment section drive unit. A holding part 214 is provided.

FIG. 44 (a) shows a cross section of the distal end of the sheath unit. As shown, the insertion portion 203 is
It is composed of a pipe 215 and an outer pipe 216 made of an insulating material and coated on the outer periphery of the pipe 215. The pipe 215 is provided with a third holding portion 217 that is combined with the treatment member holding portion 208 of the treatment portion drive unit. The third holding portion 217 includes a first groove 218 extending in the axial direction of the insertion portion 203 and a second groove 219 extending in the circumferential direction of the insertion portion 203.

The cross section of the insertion portion 203 in the assembled state of the surgical treatment tool of this embodiment is shown in FIG.
44A is a cross-sectional view taken along line aa in FIG.
(A cross-sectional view taken along the line bb of FIG. 44A). In the assembled state, the second connecting portion 209 does not engage with the first groove 218 (see FIG. 44 (b)),
Engages with the groove 219 (see FIG. 44 (c)).

FIG. 45 (a) shows a cross section of the base end of the sheath unit. A button 220 is fitted into the housing 206A of the operation unit 206 so as to be movable in a direction orthogonal to the longitudinal direction of the insertion unit 203. 45 (b) (FIG. 4)
As shown in FIG. 5A and a cross-sectional view taken along line cc in FIG. 5A), the button 220 is provided with a first leg portion 221 and a second leg portion 222.

As shown in FIG. 45C (a sectional view taken along the line d--d of FIG. 45A), the button 220 has a pin 22.
3 is projected, and this pin 223 is provided on the housing 20.
6 engages with a third groove 224 formed on the inner peripheral surface of In the figure, α is the rotation angle of the button 220. Figure 45
(D) (view in the direction of arrow e in FIG. 45 (a)) shows the third groove 2
Twenty-four shapes are shown.

As shown in FIG. 45 (a), the button 2
20 is biased upward by a spring 225. Further, the housing 206A is provided with a holding portion 227 that restricts the upward movement of the button 220. In addition,
Although the spring 225 directly presses the button 220 in the drawing, the intermediate member 22 is provided between the spring 225 and the button 220.
6 may be provided, and the biasing force of the spring 225 acts on the button 220 via the intermediate member 226.

As shown in FIG. 45 (b), in this embodiment, the rotation locking member 212 of the treatment portion drive unit is locked between the leg portions 221 and 222 of the button 220 to drive the treatment portion. The rotation of the unit with respect to the sheath unit is restricted. In this case, the rotation locking member 212
Has a parallel portion sandwiched between the first leg portion 221 and the second leg portion 222.

FIG. 46 shows the details of the button 220. The button 220 is rotated by α ° (see FIG. 45 (c)), whereby the first leg 221 and the second leg 222 are rotated.
Distance from L (state of FIG. 46 (a)) to l (FIG. 4).
6 (b) state). When the distance between the legs 221 and 222 is set to L, the third portion of the treatment section drive unit
The connecting portion 211 of the first leg 221 and the second leg 22
You can pass between the two. On the other hand, the legs 221 and 22
If the distance between the two is set to 1, the legs 221,
22 and the rotation locking member 21 of the treatment section drive unit
The width of the parallel part of 2 becomes almost equal. Specifically, the second
The leg portion 222 is formed in a step shape, and thus the second leg portion 222 has a long portion 222A having a height H and a short portion 222B having a height h. In the present embodiment, when the button 220 is rotated to the state shown in FIG. 46 (a), the length is increased within the range of the height (H-h) from the end of the long portion 222A to the end of the short portion 222B. Part 222A and first
The distance to the leg portion 221 of is set to L. Therefore, the third connecting portion 211 can pass between the legs 221 and 222 within the range of the height (H-h). In the figure, the distance L is constant over the entire range of the height (H-h), but in the state of FIG.
If 1 can pass between the leg parts 221 and 222, the distance between the leg parts 221 and 222 does not need to be constant in the range of the height (H-h).

In addition, in this embodiment, when the button 220 is rotated to the state shown in FIG.
The distance between 2A and the first leg 221 is set to l. In this case, the width of the second leg 222 is larger in the range of the height h than in the range of the height (H−h), but the distance between the legs 221 and 222 is the entire height H. It is always constant (= 1) in the range.

In the present embodiment, the first leg portion 2
21 and the second leg 222 are integrally machined from the button 220, but the first leg 221 and the second leg 222 are separated from the button 220 as in the eighth embodiment described later. It may be formed by a pin.

Next, a method for assembling the surgical treatment tool of this embodiment will be described. First, when the sheath unit is inserted into the operating body, the sheath unit is rotatably held by the fixed operating unit 201 by the first connecting portion 207. In this state, when the rotary knob 205 is rotated, the insertion portion 203 rotates. Then, by inserting the treatment section drive unit into the sheath unit, the third connection section 211 of the treatment section drive unit is connected to the holding section 214 of the movable operation section 202 and the second connection section of the treatment section drive unit is connected. The part 209 is inserted into the third holding part 217 of the sheath unit. At this time, the second connecting portion 209 is connected to the first groove 218 and the second groove 2
Insert up to the connection with 19.

In this state, when the button 220 is rotated while being pressed this time, the rotation locking member 212 of the treatment section drive unit is rotated, and the second connection section 209 moves into the second groove 2.
Engage with 19. This restricts the axial movement of the treatment section drive unit with respect to the sheath unit. At this time, the parallel portion of the rotation locking member 212 is locked between the first leg portion 221 and the second leg portion 222 of the button 220, and the rotation of the treatment section drive unit with respect to the sheath unit is restricted. It Hereinafter, such a series of operations will be described in detail.

FIG. 47 shows the leg portions 221, 22 of the button 220.
22 shows the state of engagement between the rotary locking member 212 of the operating shaft 210 and the rotary shaft 22. FIG. 47A shows the first leg 2
21 and the second leg 222 are in contact with the upper side and the lower side of the rotation locking member 212. In this state, the second connection portion 209 of the treatment section drive unit is located at the connection portion (intersection) between the first groove 218 and the second groove 219 at the distal end of the sheath unit, and The treatment section drive unit can rotate.

From this state, the button 220 is inserted into the third groove 2
When rotated in the direction indicated by the arrow in FIG. 47A along the lateral passage 224a of 24 (see FIG. 45D), a couple force is generated in the rotation locking member 212, and the treatment section drive unit rotates. To do. As a result, the parallel portion of the rotation locking member 212 is sandwiched between the legs 221 and 222 as shown in FIG. 47 (b), and rotation of the treatment section drive unit is restricted. Further, in the state of FIG. 47 (b), the second portion of the treatment section drive unit is
The connecting portion 209 of the above engages with the second groove 219, and the movement of the treatment section drive unit in the axial direction is restricted. That is, the movement of the treatment section drive unit is restricted in both the axial direction and the rotation direction.

In FIG. 47C, the button 220 is moved upward from the state of FIG.
20 pins 223 through third grooves 224 in longitudinal passages 224
The state in which the rotation of the button 220 is restricted by engaging with b is shown.

By the above operation, the treatment section drive unit, the sheath unit and the operating body are assembled.

Next, a method of disassembling the surgical treatment tool of this embodiment will be described.

From the state of FIG. 47 (c), the button 220 is pushed down and rotated in the direction opposite to that at the time of assembling. By such rotation of the button 220, the rotation locking member 212
Is rotated, and the second connection portion 209 moves from the engagement position with the second groove 219 to the intersection of the first groove 218 and the second groove 219.

FIG. 47 (d) shows a state in which the button 220 is pushed down and rotated in the direction of the arrow from the assembled state shown in FIG. 47 (c). In this state, the short portion 222B of the second leg 222 abuts on the rotation locking member 212. From this state, further push the button 220 in the direction of the arrow into the third groove 224.
When it is rotated along the lateral passage 224a, a couple force is generated in the rotation locking member 212, and the treatment section drive unit is rotated.

FIG. 47 (e) shows a state in which the rotation locking member 212 is rotated by the short portion 222B of the second leg portion 222. At this time, the second of the treatment section drive unit
The connecting portion 209 is located in the first groove 218 of the sheath unit. 47 (f) shows a state in which the button 220 is pushed upward along the vertical passage 224b of the third groove 224 from the state of FIG. 47 (e). In this state,
The rotation of the button 220 is restricted, and the treatment section drive unit can move in the rotation direction and the axial direction. Then, the treatment section drive unit is pulled out from the sheath unit, and the sheath unit is pulled out from the operation section.

As described above, according to this embodiment, the operating portion, the sheath unit, and the treatment portion drive unit can be easily disassembled and assembled, so that the washability and sterilization are improved. Further, since the treatment section drive unit can be fixed and released by simply operating the button 220, the disassembling and assembling operations can be performed only on the operation side and the insertion side, which is very simple. .

FIG. 48 shows an eighth embodiment of the present invention. This embodiment differs from the seventh embodiment only in the shape of the button 228.

As shown in FIG. 48, the button 228 has
A third leg 229, a fourth leg 230, and a fifth leg 231 are provided. These legs 229,23
0 and 231 are made of pins and are attached to the body of the button 228. The third leg 229 corresponds to the first leg 221 of the seventh embodiment, and the fourth leg 229
The leg portion 230 and the fifth leg portion 231 correspond to the second leg portion 222 of the seventh embodiment.

The operation of this embodiment is the same as that of the seventh embodiment, and the basic effect is also the same as that of the seventh embodiment.
The effect peculiar to the present embodiment that is not provided in the seventh embodiment is that the pins 229, 230, and 231 are separate from the main body of the button 220, so that processing is easy. On the other hand, the button 220 of the seventh embodiment has a complicated shape and is difficult to process.

According to the seventh and eighth embodiments described above, the following various configurations can be obtained.

(Supplementary Note 10) An openable / closable treatment member is provided on the distal end side of the insertion portion to be inserted into the living body, the operation portion is connected to the proximal end side of the insertion portion, and the operation portion is operated inside the insertion portion. In a treatment instrument for an endoscope having an operation shaft that can be advanced and retracted by means of an operation mechanism, the treatment member being opened and closed, and the treatment member being opened and closed, the treatment member drive unit having the treatment member and the operation shaft, A sheath unit that constitutes the outer shell of the insertion section, a device that fixes movement of the treatment section drive unit and the sheath unit in the operation axis direction, and a rotation direction around the insertion axis of the treatment section drive unit and the sheath unit. And a device for rotating the treatment section drive unit with respect to the sheath unit, the treatment instrument for an endoscope.

(Supplementary Note 11) The endoscopic treatment instrument according to Supplementary Note 10, wherein the movement of the treatment section drive unit and the sheath unit in the operation axis direction is fixed by a bayonet mechanism at the distal end of the insertion section.

(Supplementary Note 12) The supplementary device 10 or 11 is characterized in that the movement of the treatment section drive unit and the sheath unit in the rotational direction about the insertion axis is fixed by a fixing device provided on the proximal side of the sheath unit. Endoscopic treatment tool.

(Supplementary Note 13) The fixing device provided on the proximal side of the sheath unit is a parallel part provided on the operation shaft of the treatment section drive unit and a leg portion of the fixing device provided on the proximal side of the sheath unit. The treatment instrument for an endoscope according to any one of Supplementary Notes 10 to 12.

(Additional remark 14) The leg portion provided in the fixing device rotates around the operation shaft about an axis in a direction perpendicular to the operation shaft. Mirror treatment tool.

(Additional remark 15) The legs provided on the fixing device move in a direction perpendicular to the operation axis.
15. The endoscopic treatment tool according to any one of 14.

(Supplementary note 16) The treatment instrument for an endoscope according to any one of supplementary notes 10 to 15, characterized in that the thickness of the leg portion provided in the fixing device changes.

(Supplementary note 17) The endoscopic treatment according to any one of supplementary notes 10 to 16, wherein the device for rotating the treatment section drive unit with respect to the sheath unit is a leg portion provided in the fixing device. Ingredient

(Additional remark 18) The rotation of the fixing device is fixed at a position where the rotation of the treatment section drive unit is fixed and a position where the rotation of the treatment section drive unit is not fixed. Mirror treatment tool.

(Supplementary note 19) The supplementary note 10 characterized in that the rotation of the fixing device is fixed by moving the fixing device in the vertical direction.
The treatment instrument for endoscopes in any one of Claims-18.

(Supplementary Note 20) The treatment instrument for an endoscope according to any one of Supplementary Notes 10 to 19, which has an elastic member for urging the vertical movement of the fixing device in one direction.

(Supplementary note 21) The endoscopic treatment instrument according to any one of supplementary notes 10 to 20, wherein the elastic member for urging the fixing device is a metal spring.

(Supplementary note 22) The endoscopic treatment instrument according to any one of supplementary notes 10 to 21, wherein the elastic member for urging the fixing device is a rubber spring.

(Supplementary note 23) The endoscopic treatment instrument according to any one of supplementary notes 10 to 22, characterized in that the button and the leg portion of the fixing device are constituted by fixing separate parts.

According to the above construction, the button provided on the insertion portion is rotated to change the distance between the legs, and the buttons are moved up and down to change the width of the legs to rotationally lock the treatment section drive unit. Since the member can be rotated with respect to the sheath unit, there is an effect that a part of the disassembling and assembling operation can be automatically performed only by turning a button.

49 to 52 show a ninth embodiment of the present invention. The surgical treatment tool of this embodiment has the same basic configuration as that of the seventh embodiment. Therefore,
In the following, only parts different from the seventh embodiment will be described, common parts are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 52 shows a cross section of the base end of the sheath unit. A button 220 is fitted into the housing 206A of the operation unit 206 so as to be movable in a direction orthogonal to the longitudinal direction of the insertion unit 203. The state before pressing the button 220 is shown on the left side of FIG. 52 (a), and the state after pressing the button 220 is shown on the right side of FIG. 52 (a). The button 220 has a slit 221 formed therein. Figure 5
As shown in detail in FIG. 2 (c), the slit 221 has a parallel portion 222 into which the rotation locking member 212 of the operating shaft 210 is fitted.
A circular portion 223 having a size through which the third connecting portion 211 of the treatment portion drive unit can pass, and the rotation locking member 21.
A shoulder portion 224 for pushing 2 is provided. Also, O-rings 225 and 226 for maintaining an airtight state on the sliding surface of the button 220 are attached to the button 220.

Next, a method of assembling the surgical treatment tool of this embodiment will be described.

First, when the sheath unit is inserted into the operating body, the first connecting portion 207 holds the sheath unit rotatably on the fixed operating portion 201. In this state, when the rotary knob 205 is rotated, the insertion portion 203 rotates. Then, by inserting the treatment section drive unit into the sheath unit, the third connecting portion 211 of the treatment section drive unit is inserted.
Is connected to the holding section 214 of the movable operation section 202, and the second connecting section 209 of the treatment section drive unit is inserted into the third holding section 217 of the sheath unit. At this time, the second connecting portion 209 is inserted up to the connecting portion between the first groove 218 and the second groove 219.

In this state, when the button 220 is pushed in this time, the rotation locking member 212 of the operating shaft 210 is pushed and rotated by the shoulder portion 224 of the slit 221, and is fitted into the parallel portion 222 of the slit 221. . As a result, the rotation of the treatment section drive unit is restricted. Also at this time,
The rotation of the treatment section drive unit causes the second connecting section 20 to rotate.
9 engages with the second groove 219, and the movement of the treatment section drive unit in the axial direction is restricted.

FIG. 52D shows the positional relationship between the slit 221 and the rotation locking member 212. FIG. 52 (d)
Inside, (I) shows the state before the button 220 is pressed. In this state, the rotation locking member 212 has the slit 2
The rotary locking member 212 can be freely passed through the slit 221.
(II) shows a state in which the button 220 is pressed and the shoulder portion 224 of the slit 221 hits the rotation locking member 212. (III) shows a state in which the button 220 is further pushed downward from the state of (II) and the rotation locking member 212 is rotating. In this case, the slit 221 does not interfere with the rotation locking member 212 except for the shoulder 224. (IV) shows a state in which the rotation locking member 212 enters the parallel portion 222 of the slit 221, and the rotation of the rotation locking member 212 is restricted.

By the above operation, the assembly of the treatment section drive unit, the sheath unit and the operation section is completed.

Next, a method for disassembling the surgical treatment tool of this embodiment will be described.

First, the button 220 is pulled up from the state of (IV) of FIG. 52 (d) to position the rotation locking member 212 in the circular portion 223 of the slit 221. In this state,
Since the rotation locking member 212 is unlocked in the rotation direction, the rotation locking member 212 can freely rotate. In this state, this time, the treatment member 204 is gripped and the treatment portion drive unit is rotated, so that the second connection portion 209 is moved to the second position.
The groove 219 is moved to the intersection of the first groove 218.
As a result, the axial fixation of the treatment section drive unit is released.

By the above operation, the fixing of the treatment section drive unit in the rotational direction and the axial direction is released. Therefore, in this state, if the treatment section drive unit is pulled out from the sheath unit and the sheath unit is pulled out from the operation section, the disassembly work is completed.

As described above, according to this embodiment, the operating portion, the sheath unit, and the treatment portion drive unit can be easily disassembled and assembled, so that the washability and sterilization are improved. Further, since the treatment section drive unit can be fixed at the time of assembly simply by operating the button 220, the assembly operation is simple.

53 to 55 show a tenth embodiment of the present invention. The surgical treatment tool according to the present embodiment is provided with the operation unit 2
The configuration other than 27 is the same as that of the ninth embodiment.

As shown in FIG. 53, a rotation fixing member 228 is detachably attached to the proximal end side of the sheath unit. As shown in detail in FIGS. 54 (d) and 55 (b), the rotation fixing member 228 is provided with a first leg 229 and a second leg 230. In addition, the first leg 229 and the second leg 230 have different lengths. The rotation fixing member 228 is inserted from an opening provided in the operation portion 227, engages with the rotation locking member 212 of the operation shaft 210, and restricts rotation of the treatment portion operation unit.

FIG. 55 (b) (I) shows the rotary fixed member 2
28 shows a state in which 28 is pushed downward and the second leg portion 230 abuts against the rotation locking member 212. In (II), the rotation fixing member 228 is pushed further downward from the state of (I), and the rotation locking member 21 is pushed by the second leg portion 230.
2 shows the state of being rotated. The length of the first leg 229 is set so as not to interfere with the rotation locking member 212 in this state (II). (III) shows a state in which the rotation locking member 212 is sandwiched between the first leg 229 and the second leg 230 and rotation of the rotation locking member 212 is restricted. Note that the first leg 229
Has a length set so that it can contact the parallel portion of the rotation locking member 212 in this state (III).

As described above, according to this embodiment, the operating portion, the sheath unit, and the treatment portion driving unit can be easily disassembled and assembled, so that the washability and sterilization are improved. Further, since the treatment section drive unit can be fixed at the time of assembling by simply operating the rotation fixing member 228, the assembling operation is easy.

56 to 60 show the eleventh embodiment of the present invention. The surgical treatment tool of this embodiment has the same configuration as that of the tenth embodiment except for the operation unit 231.

As shown in FIG. 56, a button 232 is detachably attached to the operation portion 231 of the sheath unit. FIG. 58A shows a button 232 and an operation shaft 210.
The rotation locking member 212 is engaged with the treatment section drive unit so that the rotation of the treatment section drive unit is restricted. Fig. 58
(B) shows a state in which the rotation restriction of the rotation locking member 212 by the button 232 is released. As shown, the button 232 is biased in combination with the rubber spring 233. Further, the button 232 is provided with a positioning groove 236, and the operation portion 231 is provided with a positioning member 235. Wash port 237 on opposite side of button 232.
And a rubber cap 234 are provided. Button 23
An opening 240 is provided on the second cleaning port side.
The button 232 is provided with a shoulder portion 239 for rotating the rotation locking member 212.

With such a structure, when the button 232 is pushed downward, the button 232 does not interfere with the operation shaft 210. On the other hand, when the button 232 is released, the rubber spring 233
The button 232 is pushed and moved upward by the biasing force of, and the shoulder portion 239 rotates the rotation locking portion 212, that is, the treatment portion drive unit. The positional relationship between the button 232 and the rotation locking member 212 is the same as in the tenth embodiment. The positioning member 235 and the positioning groove 236 fix the button 232 at a position where the operation shaft 210 can always be inserted. By supplying water from the cleaning port 237, it is possible to perform some cleaning even with the treatment tool assembled. Also, the button 232 has an opening 240.
The water supplied from the cleaning port 237 can enter the button 232 through the opening 240.

As described above, according to this embodiment, the operating portion, the sheath unit, and the treatment portion drive unit can be easily disassembled and assembled, so that the cleaning and sterilizing properties are improved. Further, since the treatment section drive unit can be fixed at the time of assembling by simply operating the button 232, the assembling operation is easy.

According to the ninth to eleventh embodiments described above, the following structure can be obtained.

(Supplementary Note 24) An openable / closable treatment member is provided on the distal end side of the insertion portion to be inserted into the living body, the operation portion is connected to the proximal end side of the insertion portion, and the operation portion is provided inside the insertion portion. In a treatment instrument for an endoscope, which is provided with an operation shaft that can be advanced and retracted by the operation of the operation shaft, and an opening and closing drive mechanism that opens and closes the treatment member by moving the operation shaft forward and backward, a treatment section drive unit having the treatment member and the operation shaft. A sheath unit that forms the outer shell of the insertion section, a device that fixes the movement of the treatment section drive unit and the sheath unit in the operation axis direction, and a rotation direction around the insertion axis of the treatment section drive unit. A treatment instrument for an endoscope comprising a device for fixing movement and a device for rotating the treatment section drive unit in one direction with respect to a sheath unit.

(Supplementary note 25) The endoscopic treatment instrument according to supplementary note 24, characterized in that a bayonet mechanism is used to fix the movement of the treatment section drive unit and the sheath unit in the operation axis direction.

(Supplementary note 26) The supplementary device 24 or 25 is characterized in that the movement of the treatment section drive unit and the sheath unit in the rotational direction around the insertion axis is fixed by a fixing device provided on the proximal side of the sheath unit. Endoscopic treatment tool.

(Supplementary Note 27) The fixing device provided on the proximal side of the sheath unit is a parallel part provided on the operation shaft of the treatment section drive unit and a leg portion of the fixing device provided on the proximal side of the sheath unit. The treatment tool for an endoscope according to any one of appendices 24 to 26.

(Supplementary note 28) The endoscopic treatment instrument according to any one of supplementary notes 24 to 27, wherein the length of the leg portion provided on the fixing device is changed.

(Supplementary Note 29) The fixing device provided on the proximal side of the sheath unit is a parallel part provided on the operation shaft of the treatment section drive unit and a groove of the fixing device provided on the proximal side of the sheath unit. The treatment instrument for an endoscope according to any one of Supplementary Notes 24 to 26.

(Supplementary note 30) The endoscopic treatment instrument according to any one of supplementary notes 24 to 26 and 29, wherein the width of the groove provided in the fixing device is changed.

(Supplementary note 31) The endoscopic treatment according to any one of supplementary notes 24 to 28, wherein the device for rotating the treatment section drive unit with respect to the sheath unit is a leg portion provided in the fixing device. Ingredient

(Supplementary note 32) The endoscopic view according to any one of supplementary notes 24 to 26, 29 and 30, wherein the device for rotating the treatment section drive unit with respect to the sheath unit is a groove provided in the fixing device. Mirror treatment tool.

(Supplementary note 33) The endoscopic treatment instrument according to any one of supplementary notes 24 to 32, wherein the device for fixing the rotation of the treatment section drive unit and the sheath unit moves in the direction perpendicular to the operation axis. .

(Additional remark 34) The device for fixing the rotation of the treatment instrument drive unit and the sheath unit is fixed at the position for fixing the rotation of the treatment section drive unit and the position for not fixing the rotation. 33. The endoscopic treatment tool according to any one of 33.

(Supplementary note 35) The supplementary note 24, characterized in that it has an elastic member for urging the vertical movement of the device for fixing the rotation of the treatment instrument drive unit and the sheath unit in one direction.
The treatment instrument for endoscopes in any one of-34.

(Supplementary note 36) The treatment instrument for an endoscope according to any one of supplementary notes 24 to 35, wherein the elastic member for urging the fixing device is a metal spring.

(Supplementary note 37) The endoscopic treatment instrument according to any one of supplementary notes 24 to 36, wherein the elastic member for urging the fixing device is a metal spring.

(Supplementary note 38) The endoscopic treatment instrument according to any one of supplementary notes 24 to 37, characterized in that a water supply port is attached to the fixing device.

According to the above construction, the button provided on the insertion portion is operated to rotate the treatment portion drive unit with respect to the sheath unit by operating the rotation fixing member. It is possible to provide a treatment tool that automatically performs a part.

FIG. 61 shows a twelfth embodiment of the present invention. This embodiment is a modification of the fourth embodiment shown in FIG. 29, and is different from the fourth embodiment only in the shape of the rubber spring 108. Therefore, in the following, the same components as those in the fourth embodiment will be designated by the same reference numerals and the description thereof will be omitted.

As shown, the rubber spring 24 of the present embodiment.
Reference numeral 1 denotes an elastic member having an electrical insulation property, and is detachably engaged with the guide member 242 in a state where the guide member 242 is completely covered. The guide member 242 is fixed to the operation unit engaging / disengaging member 111 via a screw.

The operating section engaging / disengaging member 111 of the fourth embodiment.
Is composed of a metal member in terms of strength. Further, it is desirable that the guide member 110 for connecting the operation unit engagement / disengagement member 111 to the rubber spring 108 is fixed to the operation unit engagement / disengagement member 111 with a screw from the viewpoint of resistance. Further, in the fourth embodiment, the guide member 110 is the rubber spring 10
Due to the shape of No. 8, a part is exposed to the outside. Therefore, in consideration of the treatment with the high frequency current, the exposed portion of the guide member 110 needs to be electrically insulated.
As a material of the insulating member that electrically insulates the guide member 110, a resin material is preferable in view of cost and workability. However, it is not preferable in terms of durability to cut a screw on the resin and fix the engaging / disengaging member 111 along the resin.

On the other hand, in the structure of this embodiment, since the guide member 242 is completely covered by the electrically insulating rubber spring 241, the above-mentioned problem does not occur.

As described above, according to this embodiment, the fourth
It is possible to obtain the same effect as the embodiment of
Since the guide member 242 is completely covered by the rubber spring 241 having an electrically insulating property, the guide member 24
Since it is not necessary to attach an insulating resin to 2, it is possible to reduce the cost and improve the assemblability.

62 to 72 show a thirteenth embodiment of the present invention. The present embodiment is a modified example of the first embodiment, and its configuration is the first except the means for restricting the rotation of the treatment section drive unit 2 with respect to the sheath 29 and the joint section between the operation section 5 and the insertion section 3. The same as the embodiment of Therefore, hereinafter, the same components as those of the first embodiment will be designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 64, the sheath 2 of the insertion portion 3
A sheath body 243 is fixed to the proximal end portion of 9.
As shown in detail in FIG. 67, the sheath body 243 has two plane portions 24 that are symmetric with respect to the axis thereof.
6,246 are provided. A connection member 247 connected to the operation unit 5 is fixed to the proximal end of the sheath body 243. The base member of the connecting member 247 is provided with a butting member 248.
Are fixed, and the abutting member 248 is integrally provided with a ring-shaped packing 41. Connection member 24
A first cylindrical surface 247A and a second cylindrical surface 247B are formed at the tip portion of 7.

The abutting member 248 is provided with a ball hole 249 for accommodating the ball 250. The inner diameter of one end of the ball hole 249 is set to be the same as the diameter of the ball 250. Further, the inner diameter of the other end of the ball hole 249 is
In order to prevent the ball 250 from moving to a position where it does not interfere with the pipe 30 and from falling out of the ball hole 249, the ball 2
It is set smaller than the diameter of 50. On the base end side of the pipe 30, the hole 30 is provided at a position facing the ball hole 249.
0 is formed. The inner diameter of this hole 300 is set so that the ball 250 can move to a position within the range of the outer diameter of the abutting member 248.

A rotary knob 245 is fitted on the flat surface portion 246 of the sheath body 243. This rotary knob 245
It is attached to the flat portion 246 such that it cannot rotate but can slide in the axial direction. Further, a rubber spring 244 for urging the rotation knob 245 toward the proximal end side (the operation unit 5 side) is detachably attached between the distal end portion of the sheath body 243 and the rotation knob 245. The fixing hole 2 is inside the rotary knob 245.
45A is provided.

On the other hand, the insertion portion connecting portion 252 is fixed to the upper end of the fixed handle 76. A snap fit arm portion 253 having a slot is provided at the tip of the insertion portion connecting portion 252. Inside the tip of the snap-fit arm 253, the cylindrical surface 2 of the connecting member 247 is provided.
A protrusion 254 that engages with 47A is formed. Two recesses 251, 251 having the same radius of curvature as the ball 250 are formed at the base end of the drive shaft 24 of the treatment section unit 2 symmetrically with respect to the central axis of the drive shaft 24.

The inner diameter of the snap fit arm portion 253 is set to be substantially equal to the outer diameter of the cylindrical surface 247B of the connecting member 247. Further, the outer diameter of the snap fit arm portion 253 is set to be substantially equal to the inner diameter of the fixing hole 245A of the rotation knob 245.

Next, the case of assembling the surgical treatment tool of this embodiment will be described.

The assembly of the treatment section drive unit 2 and the sheath 29 is the same as in the fourth embodiment. In this case, when the base end portion of the drive shaft 24 passes near the abutting member 248 located at the base end of the sheath 29, the ball 250 moves outward as shown in FIG. When the treatment section unit 2 is rotated with respect to the sheath 29 in this state, as shown in FIG.
As shown in FIG. 9, the ball 250 is attached to the hole 3 of the pipe 30.
00, it is dropped into the concave portion 251 of the drive shaft 24 and falls within the range of the outer diameter of the abutting member 248. Therefore, in this state, the insertion portion connection portion 252 of the operation portion 5 can be inserted into the treatment portion unit 2.

Next, the insertion section 3 to which the treatment section drive unit 2 is assembled is assembled to the operation section 5. This procedure is also the fourth
It is similar to the embodiment. In this case, as shown in FIG. 71, the snap-fit arm portion 253 is elastically deformed outward because the projection 254 at the tip thereof crosses over the cylindrical surface 247B of the connecting member 247. Since the outer diameter of the elastically deformed snap fit arm portion 253 is larger than the inner diameter of the fixing hole 245A of the rotation knob 245, the rubber spring 244.
The rotation knob 245 is pushed out toward the distal end side of the sheath 29 against the biasing force of. After the protruding portion 254 has passed over the cylindrical surface 245B, the outer diameter of the snap-fit arm portion 253 returns to its original position, so that the rotation knob 245 returns to the original position where it abuts against the connecting member 247 by the urging force of the rubber spring 244 (FIG. 67). reference).

In this state, even if a force is applied to the sheath 29 in the distal direction, the snap fit arm 253 is
Since the protrusion 254 is fitted and fixed in the fixing hole 245A by engaging with the stepped portion between the cylindrical surfaces 247A and 247B, it cannot be elastically deformed. Also, the rotary knob 245
Cannot be rotated because it is fitted with the flat surface portion 246 of the sheath body 243. Further, the ball 250 provided at the proximal end of the sheath 29 is housed inside the insertion portion connecting portion 252 and its outward projection is restricted (see FIG. 69), so that the ball 250 and the concave portion 251 are separated from each other. Due to the engagement, the drive shaft 24 cannot rotate with respect to the pipe 30.
That is, the treatment section drive unit 2 cannot rotate with respect to the insertion section 3. Therefore, when the rotation knob 245 is rotated, the treatment section drive unit 2 is rotated via the sheath body 243, the connection member 247, and the butting member 248.

Next, the disassembling operation of the surgical treatment tool of this embodiment will be described.

The disassembly order is also the same as in the fourth embodiment.
That is, first, the movable handle 77 is opened while pulling the rotary knob 245 toward the distal end of the sheath 29. When the rotary knob 245 is pulled in the distal direction, the snap-fit arm portion 253 can be elastically deformed outward, as shown in FIG. Therefore, the insertion portion 3 can be separated from the operation portion 5 by pulling the insertion portion 3 in the distal direction with a force of a certain level or more. The disassembly of the insertion section 3 and the treatment section drive unit 2 may be performed in the reverse order of the assembly.

As described above, according to this embodiment, like the third embodiment, the disassembling / assembling work between the respective constituent elements can be easily performed in a short time. Further, since the surgical treatment tool of the present embodiment has no difficult-to-wash portion,
It is suitable as a medical device that requires a high degree of cleanliness.
Further, when the treatment section drive unit 2 is inserted into and removed from the insertion section 3, the balls only move up and down, so there is little resistance and the disassembly and assembly can be performed smoothly. In addition, the operation unit 5
Since the number of parts between the abutting portion between the insertion portion 3 and the insertion portion 3 and the engagement portion between the operation portion 5 and the insertion portion 3 is small, the insertion portion 3 and the operation portion 5 to which the treatment portion drive unit 2 is assembled are attached. It is possible to minimize the play at the joint portion with and without adjusting the assembly.

According to the twelfth and thirteenth embodiments described above, the following various configurations can be obtained.

(Supplementary note 39) An insertion portion to be inserted into the body, an operation portion installed at the proximal end portion of the insertion portion, a treatment portion for treating a living body installed at the distal end portion of the insertion portion, and the operation force. In a surgical treatment instrument having a treatment section drive unit, which comprises a means for converting into a forward / backward movement and a treatment section supporting means for converting the forward / backward movement from the operation force converting means into a movement of the treatment section, in the insertion section, On the other hand, the rotation locking means is provided for locking the drive shaft in the rotation direction, and the insertion portion is provided with a connection portion that is rotatably and detachably attachable to the operation portion. Is a fitting between at least one curved surface portion and a rotary fixing member having the same curved surface as the curved surface.

(Supplementary note 40) The surgical treatment instrument according to supplementary note 39, wherein the rotation fixing member is a spherical member.

(Supplementary note 41) The operation according to supplementary note 39, characterized in that the connecting portion is provided with an engagement / disengagement member which can be engaged / disengaged by elastic deformation, and a fixing member for urging the elastic deformation of the engagement / disengagement member. Treatment tool.

(Supplementary note 42) The surgical treatment instrument according to supplementary note 39, characterized in that a urging means for urging the fixing member to a position where the engaging / disengaging member is not elastically deformable is provided.

(Supplementary Note 43) The surgical treatment instrument according to Supplementary Note 39, wherein the fixing member also serves as an operating portion for transmitting a rotational force to the insertion portion.

(Supplementary Note 44) The surgical treatment instrument according to Supplementary Note 39, wherein the urging means is made of an elastic member having electrical insulation.

[0202]

As described above, according to the present invention, the disassembling / assembling work between the constituent elements can be easily performed in a short time, and the surgical instrument suitable as a medical device which requires a high degree of cleanliness. A treatment tool can be provided.

[Brief description of drawings]

FIG. 1 is a side view of a surgical treatment tool according to a first embodiment of the present invention.

FIG. 2 is a side view showing a state in which the surgical treatment tool of FIG. 1 is disassembled into a treatment section drive unit, an insertion section, a rotation locking member, and an operation section.

FIG. 3 is a side sectional view of the surgical treatment tool in FIG. 1.

4 is a sectional view taken along the line AA of FIG.

FIG. 5A is a side surface of a distal end portion of a treatment section drive unit,
FIG. 5B is a plan view of the treatment section drive unit.

6 is a sectional view taken along the line BB of FIG.

7 is a sectional view taken along the line CC of FIG.

8 is a development view of the pipe at the tip of the insertion portion of the surgical treatment tool in FIG. 1. FIG.

9 is a cross-sectional view taken along the line D-D in FIG.

10 is a cross-sectional view taken along the line EE of FIG.

FIG. 11 is a view on arrow F in FIG.

12 is a cross-sectional view taken along the line GG of FIG.

13 is a cross-sectional view taken along the line HH of FIG.

FIG. 14 is a developed view of the cylindrical portion viewed from the direction I in FIG.

15 is a partial cross-sectional view of an operating portion of the surgical treatment tool in FIG.

16 is a view on arrow J in FIG.

17 is a cross-sectional view showing a state in which the treatment section drive unit of the surgical treatment instrument in FIG. 1 is assembled to the insertion section and the operation section at the correct mounting positions.

FIG. 18 is a cross-sectional view showing a state in which the treatment section drive unit of the surgical treatment instrument shown in FIG. 1 is being assembled to the insertion section and the operation section at wrong mounting positions.

19 (a) to 19 (d) are positional relationships between a protrusion and an engagement groove and a positional relationship between a cylindrical cam groove and a drive shaft when disassembling and assembling the surgical treatment tool shown in FIG. FIG.

FIG. 20 is a cross-sectional view of a surgical treatment tool according to a second embodiment of the present invention.

FIG. 21 is a vertical cross-sectional view showing the surgical treatment tool in FIG. 20.

22 is a sectional view taken along the line KK of FIG.

23 is a cross-sectional view taken along the line LL in FIG.

FIG. 24 is a plan view of a surgical treatment tool according to a third embodiment of the present invention.

25 is a longitudinal sectional view of the surgical treatment tool in FIG. 24. FIG.

26 is a cross-sectional view taken along the line MM of FIG.

27 is a sectional view taken along the line NN of FIG.

28 (a) to (c) show the positional relationship between the protrusion and the engaging groove and the positional relationship between the drive shaft and the fork member when the surgical treatment tool of FIG. 24 is disassembled and assembled. FIG.

FIG. 29 is a partial cross-sectional view of the surgical treatment tool according to the fourth embodiment of the present invention.

30 is a cross-sectional view showing a state in which the treatment section drive unit of the surgical treatment tool in FIG. 29 is assembled to the insertion section.

31 (a) is a cross-sectional view taken along line OO of FIG.
(B) is sectional drawing which follows the PP line of FIG.

32 is a sectional view taken along the line QQ of FIG. 30 corresponding to the positional relationship between the protrusion and the engaging groove when disassembling and assembling the surgical treatment tool of FIG. 29.

33 is a cross-sectional view showing a state in which the treatment section drive unit and the insertion section of the surgical treatment tool in FIG. 29 are assembled to the operation section at the correct mounting position.

34 is a cross-sectional view taken along the line RR of FIG.

FIG. 35 is a partial cross-sectional view of the surgical treatment tool according to the fifth embodiment of the present invention.

36 is a cross-sectional view taken along the line SS of FIG.

37 is a cross-sectional view taken along the line TT of FIG.

FIG. 38 is a partial cross-sectional view of the surgical treatment tool according to the sixth embodiment of the present invention.

39 is a plan view showing a partial cross section of the surgical treatment tool in FIG. 38. FIG.

40 is a cross-sectional view taken along the line U-U of FIG. 38.

41 is a cross-sectional view taken along the line VV of FIG. 38.

FIG. 42 is a side view of the surgical treatment tool according to the seventh embodiment of the present invention.

43A is a side view of a sheath unit, FIG. 43B is a side view of a treatment section drive unit, and FIG. 43C is a side view of an operation section.

FIG. 44 (a) is a distal end portion of a sheath unit and its cross-sectional view, (b) is a cross-sectional view taken along the line aa of (a),
(C) is sectional drawing which follows the bb line | wire of (a).

FIG. 45 (a) is a cross-sectional view of the rear end of the sheath unit,
(B) is a sectional view taken along the line cc of (a), (c) is a sectional view taken along the line dd of (a), and (d) is an arrow view in the e direction of (a).

46 (a) and (b) are a side view and a front view of a button of the surgical treatment tool in FIG. 42.

47 (a) to (f) are views showing the operation of the button and the rotation locking member of the operation shaft of the surgical treatment tool of FIG. 42.

48 (a) and 48 (b) are a side view and a front view of a button of a surgical treatment tool according to an eighth embodiment of the present invention.

FIG. 49 is a side view of the surgical treatment tool according to the ninth embodiment of the present invention.

50 (a) is a side view of a sheath unit constituting the surgical treatment tool of FIG. 49, (b) is a side view of a treatment section drive unit constituting the surgical treatment tool of FIG. 49, (c). FIG. 40 is a side view of an operation unit constituting the surgical treatment tool in FIG. 49.

51 (a) is a side view and a cross-sectional view of the distal end side of the surgical treatment tool of FIG. 49, (b) is a cross-sectional view taken along the line a'-a 'of (a), and (c) is (a). 3) is a sectional view taken along line b′-b ′ in FIG.

52 (a) is a cross-sectional view of the surgical treatment tool of FIG. 49 on the proximal side, (b) is a cross-sectional view taken along the line f-f of (a), (c).
FIG. 7B is a cross-sectional view taken along the line gg of FIG. 9B, and FIG.

FIG. 53 is a side view of the surgical treatment tool according to the tenth embodiment of the present invention.

54A is a side view of a sheath unit that constitutes the surgical treatment tool of FIG. 53, FIG. 54B is a side view of a treatment section drive unit that constitutes the surgical treatment tool of FIG. 53, and FIG. Figure 5
The side view of the operation part which comprises the surgical treatment tool of No. 3, and (d) is a side view of the rotation fixing member which comprises the surgical treatment tool of FIG.

55 (a) is a cross-sectional view of the proximal portion of the treatment portion of the surgical treatment tool in FIG. 53, and FIG. 55 (b) is a diagram showing the operation of the rotation fixing member and the rotation locking member of the operation shaft.

FIG. 56 is a side view of the surgical treatment tool according to the eleventh embodiment of the present invention.

57 (a) is a side view of a sheath unit of the surgical treatment tool of FIG. 56, (b) is a side view of a treatment section operation unit, FIG.
(C) is a side view of the operation unit.

58 (a) and 58 (b) are cross-sectional views of the operation portion of the surgical treatment tool in FIG. 56.

59 is a cross-sectional view taken along the line hh of FIG.

60 is a cross-sectional view taken along the line ii of FIG. 59.

FIG. 61 is a side sectional view of a surgical treatment tool according to a twelfth embodiment of the present invention.

FIG. 62 is a side view of the surgical treatment tool according to the thirteenth embodiment of the present invention.

FIG. 63 is a side view of the treatment section drive unit.

FIG. 64 is a side view of the insertion portion.

FIG. 65 is a side view of an assembly in which the treatment section drive unit is assembled to the insertion section.

FIG. 66 is a side view of the operation unit.

FIG. 67 is a cross-sectional view of a connecting portion between the insertion portion and the operation portion.

68 is a cross-sectional view taken along the line WW of FIG. 67.

69 is a sectional view taken along line XX of FIG. 67.

70 is a view showing a state in which the treatment section drive unit is inserted into the insertion section in a state where the operation section is not assembled;
Sectional drawing which follows the line.

FIG. 71 is a cross-sectional view of the connecting portion between the insertion portion and the operation portion during operation after assembly.

72 is a cross-sectional view showing a state in which the insertion portion is removed from the operation portion while pulling the rotation knob in the distal direction.

[Explanation of symbols]

2 Treatment unit drive unit 3 ... insertion part 5 ... Operation part 7 ... Treatment department 23 ... Driving member (driving means) 24 ... Drive shaft 76 ... Fixed handle 77 ... Movable handle 108 ... Rubber spring (biasing means) 111 ... Engagement / detachment member (disengagement member) 121 ... Engagement part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsumi Sasaki             2-43 Hatagaya, Shibuya-ku, Tokyo Ori             Inside Npus Optical Industry Co., Ltd. (72) Inventor Toshihiko Hashiguchi             2-43 Hatagaya, Shibuya-ku, Tokyo Ori             Inside Npus Optical Industry Co., Ltd. (72) Inventor Akira Shiga             2-43 Hatagaya, Shibuya-ku, Tokyo Ori             Inside Npus Optical Industry Co., Ltd. F-term (reference) 4C060 GG08 GG28 MM24

Claims (9)

[Claims] 1. An operating section having an insertion section to be inserted into a living body, a fixed handle connected to a proximal end side of the insertion section, and a movable handle operable with respect to the fixed handle. An operable treatment section disposed on the distal end side of the insertion section,
A treatment section drive unit having a drive shaft for transmitting an operation force of the operation section and a drive unit for receiving the movement of the drive shaft and driving the treatment section, wherein the fixed handle is provided. A cylindrical engaging portion is provided on the tip side of the engaging portion, and an engaging / disengaging member capable of engaging / disengaging with the engaging portion, and the engaging / disengaging member with the engaging portion are provided on the proximal side of the insertion portion. A surgical treatment tool comprising: a biasing unit that biases the engagement position. 2. An insertion portion having an internal space that can be inserted into a living body and that penetrates from a distal end portion to a proximal end portion, a treatment portion unit that can be arranged at a predetermined position in the internal space, and the treatment portion. A coupling portion provided at a base end portion of the unit, a treatment portion provided at a distal end portion of the treatment portion unit capable of treating the inside of the living body, and a drive for driving the treatment portion according to the movement of the coupling portion. Means, an operation part connectable to the proximal end side of the insertion part and for operating the treatment part unit, a fixed handle provided on the operation part, a fixed handle provided on the operation part, and the fixed part. A movable handle that is movable relative to the handle; an engaging portion that is provided on the movable handle and that can engage with the coupling portion; and an operating portion that is provided at the predetermined position in the insertion portion. Placed in An engaging portion that connects the operation portion and the proximal end proximal side of the insertion portion such that the coupling portion of the placing portion unit and the engaging portion are engaged with each other, and a proximal end proximal side of the insertion portion. And a biasing means for biasing the engagement / disengagement member to the engagement position with the engagement part. Treatment tool. 3. An insertion section that can be inserted into a living body, an operable treatment section that is disposed on the distal end side of the insertion section, and a proximal end section of the insertion section that is detachably provided and that has the treatment section. An operation unit for operating, a drive shaft connected to the treatment unit for transmitting an operation force of the operation unit to the treatment unit, and provided at a base end of the insertion unit to support the drive shaft. A drive shaft support member, an insertion portion connection portion provided in the operation portion, the insertion portion connection portion having an opening into which the drive shaft support member can be inserted, an engagement portion provided in the insertion portion connection portion, An engagement / disengagement member which is provided in the insertion portion and which is located at an engagement position where the engagement portion can be engaged with the insertion operation of the drive shaft support member into the opening portion; Urging means for urging the engagement / disengagement member to the engagement position, Surgical treatment tool. 4. The pressing portion for releasing the engagement state between the engagement / disengagement member and the engagement portion is provided in the insertion portion, according to any one of claims 1 to 3. 1
The surgical treatment tool according to the item. 5. A pressing member is provided on the insertion portion and presses the engagement / disengagement member to an engagement release position where the engagement state between the engagement / disengagement member and the engagement portion is released. The surgical treatment tool according to any one of claims 1 to 3, wherein: 6. The engagement / disengagement member has an engagement protrusion that comes into contact with the engagement portion as the insertion portion and the operation portion move relative to each other, and the engagement protrusion includes: The surgical treatment tool according to any one of claims 1 to 3, wherein a sloped surface that guides the engagement portion to the engagement position is formed. 7. The sloped surface that guides the engagement / disengagement member to the engagement position is formed in the engagement portion, according to any one of claims 1 to 3. The surgical treatment tool described. 8. The engagement / disengagement member has an engagement protrusion that comes into contact with the engagement portion as the insertion portion and the operation portion move relative to each other, and the engagement protrusion includes: The surgical treatment tool according to any one of claims 1 to 3, wherein a sloped surface that is inclined with respect to the direction of the forward / backward movement is formed. 9. The slope of the engagement portion, which is in contact with the engagement / disengagement member as the insertion portion and the operation portion move relative to each other, is inclined with respect to the direction of the movement operation. The surgical treatment tool according to any one of claims 1 to 3, wherein the surgical treatment tool has a surface.