JP2009160204A - Curve operation device of endoscope and endoscope using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To have a sufficient space for absorbing slack of wires while saving a space of a connecting member. <P>SOLUTION: A decoupled end 25a of a P wire 25 wound around a pulley 23 is connected to a connecting member 27. The connecting member 27 is connected with an A wire 29 for actuating a curving portion. The connecting member 27 is formed with an insertion hole 53 for inserting the P wire 25 and an insertion hole 54 for inserting the A wire 29 deflected in the orthogonal direction to the axial direction of the wire. The decoupled ends 25a and 29a are fixed with engagement portions 51a and 52a. The engagement portions 51a and 52a come into contact with contact walls 58 and 59 along the tensile direction of the wires to transmit the forces to the counter-side wires and, when the respective wires 25 and 29 are slacked, move passing each other to absorb the slack in the direction apart from the contact walls 58 and 59. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an endoscope bending operation device for bending a bending portion by pulling a wire in conjunction with an operation of an operation portion, and an endoscope using the same.

  The endoscope has a configuration in which an insertion portion to be inserted into the body is connected to a hand operation portion. The insertion portion is provided with a distal end portion, a bending portion, and a flexible tube portion in order from the distal end. At the tip, an objective lens, an imaging sensor such as a CCD, and an illumination lens are provided. The tip portion is formed of a hard resin material in order to protect each lens and the image sensor. The flexible tube portion is a thin and long tube portion that connects the operation portion and the bending portion, and has flexibility. The bending portion is bent in any of the up, down, left, and right directions by a wire connected to the operation knob through the flexible tube portion by rotating the operation knob provided in the hand operation portion. Thereby, the insertion into the body becomes smooth, and the tip can be directed in a desired direction in the body.

  The operation knob includes an up / down operation knob for bending the bending portion in the up / down direction and a left / right operation knob for bending in the left / right direction. The bending portion has a configuration in which the first and left and right bending portions are connected in series. The bending portion for up and down is configured by rotatably connecting a plurality of bending pieces so as to bend in the vertical direction, and the bending portion for left and right is rotated so as to bend the plurality of bending pieces in the left and right direction. It is configured to be freely connected. An up / down pulley is coaxially attached to the up / down operation knob, a wire is wound around the up / down pulley, and both ends of the wire pass through the insertion portion to the up / down bending portion. It is connected. On the other hand, left and right pulleys are attached to the left and right operation knobs. Similar to the upper and lower pulleys, a wire is wound around the left and right pulleys, and both ends of the wire are connected to the left and right curved portions. When the operation knob is rotated, the wire is pushed and pulled, and each bending portion is bent in conjunction with it.

  When pushing and pulling a wire, it is known that there is a difference in the movement amount of the wire on the pulling side and the pushing side, the wire is bent on the pushing side, and the wire is slackened. Since a force acts in the pushed direction at the place where the slack occurs, the place is easily plastically deformed. Since the rigidity of the plastically deformed portion decreases, there is a high risk of breakage when a tensile force and a pushing force are repeatedly applied thereto.

  In the endoscope described in Patent Document 1, as a measure for preventing the occurrence of slack in the wire, the slack of the wire is absorbed by partially using a chain instead of the wire. However, the chain is heavier than the wire and the weight of the endoscope increases, resulting in a decrease in operability.

In the endoscope described in Patent Document 2, a part of the wire connecting between the pulley and the bending portion is divided, and the slack of the wire is absorbed by the connecting member that connects the divided ends of the divided wires. I have to. The connecting member is formed of a cylindrical body, and the cylindrical body is formed with one guide portion in which each divided end of the wire moves linearly. Each divided end of the wire is housed in one guide part, and each divided end moves freely on the same straight line. The dividing end of each wire absorbs slackness of the wire by floating in the guide part while widening the distance between the two.
JP-A-8-280606 Japanese Utility Model Publication No. 49-73286

  However, since the slackness of the wire increases as the wire becomes longer, if the amount of slack absorption needs to be increased, the length of the guide portion must be increased in the axial direction of the wire. The total length of the connecting member will be long. This problem is particularly noticeable in an endoscope having a long insertion portion such as an endoscope for examination of the lower digestive tract. The connecting member is accommodated in the hand operating portion and is disposed near the proximal end of the insertion portion. Since the hand operating part is narrower toward the proximal end of the insertion part, it is difficult to secure a space for storing a large connecting member, and the amount of loosening of the wire can be absorbed without increasing the total length of the connecting member. Measures to earn money were requested.

  The present invention has been made in view of such circumstances, and provides an endoscope operating device and an endoscope that can increase the amount of wire slack absorption without increasing the overall length of the connecting member. With the goal.

  In order to achieve the above object, in the endoscope operating device according to the present invention, an operating member provided on the proximal end side of the insertion portion insertion portion of the endoscope inserted into the subject; A wire having both ends attached to the bending portion through the insertion portion; a pulling member that pulls the wire in conjunction with operation of the operation member; a pair of first and first wires of the wire The two divided ends are connected to each other, and at least the first divided end is held freely within a range in which the slack of the wire can be absorbed so that the first and second divided ends pass each other. A connecting member.

  As the pulling member that pushes and pulls the wire in conjunction with the operation of the operation unit, an arm member having a pair of arms on both sides of the pulley or the rotation shaft can be used. In the case of using a pulley, the pulley may be provided so as to rotate in conjunction with the rotation operation of the operation member, and the both ends of the wire may be attached to the connecting member by winding the wire. When using an arm member, the split ends of the wires may be attached to the pair of arms, respectively, and the other split end may be attached to the connecting member. As the operation member, a knob, a lever, or the like can be used.

  The connecting member may be provided at a symmetrical position across the pulley when the bending portion is not bent, or may be provided only on one side.

  The connecting member includes a first guide portion that is continuously provided in a direction that absorbs slackness of the wire from an entrance through which the first divided end is inserted, and that guides a floating direction of the first divided end; It is desirable to have a structure having a first retaining portion that engages with an engaging portion fixed to the first retaining portion and prevents the first divided end from coming out of the inlet. Further, the connecting member has a second guide portion and a second retaining portion corresponding to the second divided end, similarly to the first guide portion and the first retaining portion corresponding to the first divided end. It is desirable to make it.

  In addition, it is preferable that the first guide portion is provided with an outlet through which each divided end protrudes when the first divided end moves freely. Furthermore, it is preferable that the entrance of the first guide part is shifted from the extension of the axis of the wire connected to the second dividing end to form the first guide part in a straight line. In addition, it is desirable to form the second guide portion in a straight line.

  Further, as the connecting member, the inlet of the first guide part may be disposed on the extension of the shaft of the wire connected to the second divided end, and the first guide part may be formed in a bent shape.

  The operation member is provided on the proximal end side opposite to the distal end portion with respect to the insertion portion. Therefore, it is preferable to provide the pulling member in the vicinity of the operation member because the interlocking is easy. In this case, it is desirable to provide the connecting member in the vicinity of the pulling member. Further, it is preferable to extend the first and second guide portions in the vicinity of the pulling member.

  According to the endoscope operating device of the present invention, the first and second divided ends obtained by dividing at least one portion of the wire pushed and pulled in conjunction with the operation of the operation unit are connected to each other. Since it has a connecting member that holds at least the first dividing end in a range that can absorb the slack of the wire so that the second dividing ends pass each other, the length of the connecting member is not changed. Therefore, it is possible to earn a large amount of absorbing the slackness of the wire, and thus it is possible to store the connecting member in a space-saving manner.

  As shown in FIG. 1, the endoscope 10 has an elongated shape including an insertion portion 11 that is inserted into the body, an operation portion 12 that is operated at hand, a universal cord 13, and the like. The insertion portion 11 is formed in a tubular shape, and includes a distal end portion 14, a bending portion 15, and a flexible tube portion 16 in order from the distal end. The universal cord 13 has one end connected to the operation unit 12 and the other end connector 18 connected to a processor device 19, an air supply device (not shown), a light source device (not shown), and the like. The processor device 19 is provided with a video signal processing unit for performing image processing on an imaging signal obtained from an imaging sensor built in the distal end portion 14 and encoding it into a composite signal or a component signal. An in-vivo image generated by performing various processes in the processor device 19 is displayed on the monitor 20.

  The tip portion 14 is made of a hard resin material in order to protect the lens, the image sensor, and the like. The flexible tube portion 16 is a portion connecting the operation portion 12 and the bending portion 15 and has flexibility.

  Two pulleys 23 and 24 for up and down and left and right are provided inside the operation unit 12, and the pulleys 23 and 24 are arranged so as to be shifted in the rotation axis direction (see FIG. 3). The pulley 23 and the bending portion 15a are connected by an operation wire. The operation wire includes a pulley side wire (hereinafter abbreviated as P wire) 25 wound around the pulley 23 and two bending portion side A wires (hereinafter abbreviated as A wire) 29 connected to the bending portion 15a. The bent portion side B wire (hereinafter referred to as B wire) 30 is divided into three wires, both ends (divided ends) 25a and 25b of the P wire 25, and one end of the A wire 29 and the B wire 30. The parts (divided ends) 29a and 30a are connected by connecting members 27 and 28, respectively. The other ends 29b and 30b of the A wire 29 and the B wire 30 are connected to the bending piece 21 of the bending portion 15a. The pulley 23, the connecting members 27 and 28, the P wire 25, the A wire 29, and the B wire 30 constitute a vertical drive system.

  The left and right drive system is also composed of the pulley 24, the connecting members 36 and 37, the P wire 35, the A wire 38 and the B wire 39, similarly to the vertical drive system. Both ends (partition ends) 35a and 35b of the P wire 35 are connected to the end portions 38a and 39a of the A wire 38 and the B wire 39 by connecting members 36 and 37, respectively. The other ends 38b and 39b of the A wire 38 and the B wire 39 are connected to the bending portion 15b.

  As shown in FIG. 3, the operation unit 12 is provided with operation knobs 41 and 42 for operating the bending portions 15a and 15b. The operation knobs 41 and 42 are connected to pulleys 23 and 24, respectively. Has been. The operation knob 41 is an operation knob for bending the up / down bending portion 15a in the up / down direction, and the operation knob 42 is an operation knob for bending the left / right bending portion 15b in the left / right direction. These operation knobs 41 and 42 are provided to be exposed to the outside of the housing 40 of the operation unit 12, and the P wires 25 and 35 are pushed and pulled along the axial direction of the insertion unit 11 in conjunction with each rotation operation. Then, the bending portions 15a and 15b are bent in the vertical and horizontal directions. Thereby, the front-end | tip part 14 can be orient | assigned to the desired direction in a body, and the imaging range of an imaging sensor can be aimed at a desired observation site | part.

  The four connecting members 27, 28, 36, and 37 move with the pushing and pulling operations of the P wires 25 and 35, the A wire, and the B wires 29, 30, 38, and 39. In order to guide this movement, as shown in FIG. 4, a support member 44 is built in the tip of the operation unit 12. Four movement paths 45 to 48 are formed in the support member 44. These moving paths 45 to 48 individually support the connecting members 27, 28, 36, and 37, and prevent them from interfering with each other.

  The support member 44 has a contour shape that narrows toward the insertion portion 11 in accordance with the contour shape of the housing 40 of the operation portion 12, and accordingly, each of the moving paths 45 to 48 also faces the distal end portion 14. It has a downward slope. In each of the moving paths 45 to 48, a stopper member 49 for restricting the moving amount of the connecting members 27, 28, 36, and 37 is provided on the pulleys 23 and 24 side, respectively.

  Since the vertical drive system and the left and right drive system have substantially the same configuration, the vertical drive system will be described below as an example. As shown in FIG. 5, when the operation wire is pushed and pulled by the rotation of the pulley 23, the connecting members 27 and 28 move, and the relative distance between the connecting members 27 and 28 and the pulley 23 changes. Assuming that the positions of the connecting members 27 and 28 when the curved portion 15a is straight are the positions (initial positions) shown in FIG. 5 (A), the pulley 23 is rotated counterclockwise as shown in FIG. 5 (B). When rotated, the connecting member 27 on the pull side of the P wire 25 moves toward the pulley 23, and conversely, the connecting member 28 on the pushing side moves toward the distal end portion 14. On the other hand, as shown in FIG. 5C, when the pulley 23 rotates in the clockwise direction, the connecting member 27 moves toward the distal end portion 14 and the connecting member 28 moves toward the pulley 23.

  As shown in FIG. 6, the connecting member 27 is formed with a pair of insertion holes 53, 54 including an insertion hole 53 through which the P wire 25 is inserted and an insertion hole 54 through which the A wire 29 is inserted. Yes. In the insertion holes 53 and 54, there are formed inlets 53a and 54a through which the wires 25 and 29 are inserted, and outlets 53b and 54b in which the divided ends 25a and 29a protrude from the insertion holes 53 and 54, respectively.

  The insertion hole 53 is a guide portion that holds each divided end 25a of the P wire 25 so as to be freely movable in the axial direction of the P wire 25 and guides the direction of movement. The insertion hole 54 is a guide portion that holds each divided end 29 a of the A wire 29 so as to be freely movable in the axial direction of the A wire 29 and guides the direction of the movement. The pair of insertion holes 53 and 54 are each formed in a straight line, and are arranged such that the axis of the P wire 25 or the A wire 29 inserted through each of them is displaced from the other axis. 53 and 54 are formed substantially in parallel. As a result, the divided end 25a of the P wire 25 and the divided end 29a of the A wire 29 pass each other.

  Further, the connecting member 27 is formed with notches 56 and 57 respectively connected to the insertion holes 53 and 54. The notch 56 slidably accommodates the engaging portion 51 a provided at the dividing end 25 a and stabilizes the engaging portion 51 a protruding from the outlet 53 b of the insertion hole 53. In the cutout portion 56, an abutting wall (a retaining portion) 58 that abuts on the base end side of the engaging portion 51 a is formed at the edge of the outlet 53 b of the insertion hole 53. The engaging portion 51a is formed to be thicker than the diameter of the P wire 25. When the P wire 25 is pulled toward the pulley 23 (leftward), the engaging portion 51a comes into contact with the contact wall 58 and the dividing end 25a. Is a retaining portion for preventing the thread from coming out of the insertion hole 53.

  The notch 57 slidably accommodates the engaging portion 52 a provided at the split end 29 a of the A wire 29, and stabilizes the engaging portion 52 a protruding from the outlet 54 b of the insertion hole 54. The notch portion 57 is formed with an abutting wall (a retaining portion) 59 that abuts on the base end side of the engaging portion 52 a at the edge of the outlet 54 b of the insertion hole 54. The engaging portion 52a is formed to be thicker than the diameter of the A wire 29. When the A wire 29 is pulled toward the distal end portion 14 side (right direction), the engaging portion 52a comes into contact with the contact wall 59 and is divided. 29 a is a retaining portion for preventing 29 a from being removed from the insertion hole 54.

  The contact walls 58 and 59 are pulled when the P wire 25 is pulled toward the pulley 23 or the A wire 29 is pulled toward the distal end 14 due to the contact with the engaging portions 51a and 52a, respectively. The tensile force is transmitted to the other wire.

  Further, since the insertion holes 53 and 54 are arranged so as to be shifted, the movement of the divided end 25a of the P wire 25 toward the distal end portion 14 side (right direction), and the pulley 23 side of the divided end 29a of the A wire 29 are arranged. There is nothing that restricts movement to the left. Therefore, it is possible to increase the amount of slack absorption of the P wire 25 and the A wire 29 compared to a structure in which two wires connected to one insertion hole are coaxially accommodated as in the conventional connecting member. it can. Moreover, since the insertion holes 53 and 54 are shifted and arranged, the entire length of the connecting member 27 is not increased.

  Similarly to the connection member 27, the connection member 28 is also formed with a pair of insertion holes 53 and 54 through which the P wire 25 and the B wire 30 are inserted, and is connected to each of the insertion holes 53 and 54. Thus, notches 56 and 57 for accommodating the engaging portions 51b and 52b of the P wire 25 and the B wire 30 are formed. Since the structure and function of the insertion holes 53 and 54 and the notches 56 and 57 are the same as those of the connecting member 27, description thereof is omitted.

  The operation of the above configuration will be described. As shown in FIG. 6, when the initial positions of the connecting members 27 and 28 are the straight positions of the bending portion 15, the relative distances between the connecting members 27 and 28 and the pulley 23 are substantially equal. The state of the connecting member 27 at this time is such that, for example, the engaging portion 51a of the P wire 25 comes into contact with the contact wall 58 of the notch portion 56, and the connecting member 28 is connected to the engaging portion 52b and the notch portion 57. There is a play of length A between the contact wall 59.

  When the pulley 23 rotates counterclockwise in conjunction with the operation of the up / down operation knob 41, the dividing end 25a of the P wire 25 is pulled toward the pulley 23 by the length A, and the connecting member 27 is pulled by this pulling. Moves toward the pulley 23. At this time, in the connecting member 28 on the push-out side, the dividing end 25b is sent out toward the tip in the insertion direction, and the engaging portion 51a fixed to the dividing end 25b is sent out by the dividing end 25a, that is, The distance from the contact wall 58 is the length A. At this time, the dividing end 25b is guided by the notch portion 56 of the connecting member 28 so as to pass the dividing end 30a.

  When the connecting member 27 moves toward the pulley 23 by the length A, the contact wall 59 of the notch portion 57 contacts the engagement portion 52a. And after contact | abutting, the connection member 27 will pull the A wire 29 toward the pulley 23, and will be in the state shown in FIG.

  Further, when the A wire 29 is pulled toward the first pulley 23, the vertical bending portion 15a starts to bend upward or downward. As the B wire 30 is pulled toward the distal end in the insertion direction along with this bending, the engaging portion 52a abuts against the abutting wall 59, and the connecting member 28 moves toward the distal end portion 14 side. It will be in the state shown in. When the rotation operation of the up / down operation knob 41 is returned to the original position, the connecting members 27 and 28 return to the state shown in FIG. 6 again.

  In the above example, the example in which the pulley 23 is rotated in the counterclockwise direction has been described. Conversely, when the pulley 23 is rotated in the clockwise direction, the pulling side (upper) connecting member described in FIGS. 27 is similarly applied to the connecting member 28 on the Yurumi side (lower side), and the action of the connecting member 28 on the Yurumi side (lower side) is now connected to the connecting member on the pulling side (upper side). 27 will work.

  When slack occurs in the P wire 25, the divided ends 25 a and 25 b move toward the distal end portion 14 while being guided by the insertion holes 53, so that the slack of the P wire 25 is absorbed. Further, when the A wire 29 and the B wire 30 are slack, the divided ends 29a and 30a move toward the pulley 23 while being guided by the insertion holes 54, so that the A wires 29 and B are moved. The slack of the wire 30 is absorbed. Since the insertion holes 53 and 54 of the connecting members 27 and 28 are arranged so as to be shifted, the divided end 25a and the divided end 29a, and the divided end 25b and the divided end 30a pass each other. By configuring the connecting members 27 and 28 in this way, it is possible to increase the amount of slack absorption without increasing the total length of the connecting members 27 and 28. Further, it is not necessary to increase the size of the operation unit 12 in which the connecting members 27 and 28 are accommodated.

  In the above embodiment, the pair of insertion holes (guide portions) of the connecting members are each formed in a straight line, and they are arranged so as to be shifted from each other. It is shifted from the axis of the other wire different from the inserted wire. For this reason, a shift occurs in the point of action of the pulling force of each wire, and a rotational force acts on the connecting member. Such a rotational force may be a factor that hinders the smooth movement of the connecting member.

  The connecting members 71 and 83 shown in FIG. 9 are examples in which the points of action of the pulling force of a pair of wires inserted through the connecting members 71 and 83 are arranged on the same straight line. First and second guide portions 73 and 78 are provided on one side of the connecting member 71 with the pulley 23 interposed therebetween. An engaging portion 74 is movably engaged with the first guide portion 73. The engaging portion 74 is fixed to the divided end 25 a of the P wire 25. The first guide portion 73 moves the engaging portion 74 by a predetermined length between a contact wall (a retaining portion) 75 having an insertion hole 80 through which the P wire 25 is inserted and a wall 76 facing the wall. Is regulated.

  An engaging portion 77 fixed to the dividing end 29a of the A wire 29 is movably engaged with the second guide portion 78. The second guide portion 78 is formed with a bent portion 79 for guiding the movement of the engaging portion 77 so as to pass the engaging portion 74 while avoiding the first guide portion 73 in part or in whole. Yes. Instead of the bent portion 79, a curved portion that is curved may be formed. Here, the reason for increasing the guide amount of the second guide portion 78 relative to the first guide portion 73 is that the A and B wires 29, 30 on the distal end portion 14 side are longer than the P wire 25, This is because relaxation increases accordingly.

  An insertion hole 81 for inserting the A wire 29 is formed in the second guide portion 78, and the insertion holes 80, 81 are arranged on the axis of the P wire 25. The insertion hole 81 restricts the movement of the engaging portion 77 between the abutting wall (preventing portion) 82 and the wall 84 opposed thereto to a certain length longer than the other. The connecting member 83 on the opposite side across the pulley 23 has the same configuration as the connecting member 71. As a result, when the tensile force is transmitted between the P wire 25 and the A and B wires 29 and 30, the rotation is not applied to the connecting members 71 and 83 because the tensile force is transmitted on the same axis. Since the first and second guide portions 73 and 78 have a bag shape, the engaging portions 74 and 77 are in the initial state where the bending operation is not performed. 78, the length of each of the wires 25, 29, 30 is determined so as to be located in the middle of the axial length.

  The second guide portion 78 of the embodiment described with reference to FIG. 9 is provided with a wall on the pulley 23 side in the guide direction of the engaging portion 77, so that the amount of slack absorption is restricted, but further loosening is performed. In order to earn an amount to be absorbed, a wall on the pulley 23 side of the second guide portion 78 may be opened to create an outlet.

  By the way, in order to reduce the size of the operation unit 12, it is preferable to dispose the connecting member near the pulley. In this case, since the A wire 29 becomes longer, it is necessary to set a large amount of slack absorption of the A wire 29. Therefore, as shown in FIG. 10, the second guide portion 78 may be extended to increase the amount of slack absorption. The connecting member 90 shown in the figure has the same configuration as the connecting member 71 described with reference to FIG. 9, and the outlet 85 is formed by opening the wall on the pulley 23 side of the second guide portion 78. When absorbing a large slack, the engaging portion 77 and the dividing end 29a protrude from the connecting member 90 to the outside, and thus may move freely and interfere with other members. For this reason, it is preferable to cover the floating path from which the engaging portion 77 and the dividing end 29 a protrude with the cover member 92. The cover member 92 is formed with a straight guide portion 93 that guides the movement of the engaging portion 77.

  Furthermore, considering that the movable range of the engaging portion 77 is long, the guide portion 95 of the cover member 94 may be curved along the outer periphery of the pulley 23 as shown in FIG. In this case, if the guide portion 95 is curved with a radius larger than that of the pulley 23, the free movement of the divided end 29a of the A wire 29 is along the outer periphery of the pulley 23. Therefore, the free space of the divided end 29a is made compact. Can be achieved. In this case, since the cover member 94 is curved, it cannot move together with the connecting member 90. Therefore, it is desirable to fix the cover member 94 and to provide the bellows member 100 for absorbing the movement to the connecting member 90 between the connecting member 90 and the cover member 94.

  In each of the above embodiments, both the vertical drive system and the left and right drive system are provided, but either one may be omitted. In addition, two connecting members are provided in each drive system, but either one may be omitted. Furthermore, although the operation member is described as a knob, an operation unit such as a lever may be used. Furthermore, in each of the above embodiments, the pulley and the pair of connecting members are connected by a single wire. However, the present invention is not limited to this, and the pulley and the pair of connecting members are connected by two wires. You may connect with the wire of. In this case, two grooves may be provided in the pulley, and one end of one wire may be wound around one groove and one end of the other wire may be wound around the other groove. Moreover, you may use the structure which rotates a pair of arm which attached two wires in response to rotation operation of an operation part, and pushes and pulls a pair of wire.

  In each of the above embodiments, the electronic endoscope is described, but the present invention can also be applied to an endoscope that is observed only by optical means such as a fiberscope. Furthermore, the present invention can also be applied to a treatment instrument erecting device that erects a treatment instrument inserted through a forceps channel of an insertion portion to be inserted into an observation site with a wire.

It is explanatory drawing which shows the use condition of an electronic endoscope. It is explanatory drawing which shows the connection state of each wire roughly. It is principal part sectional drawing which shows the connection state of the operation knob and the pulley which wound the wire. It is a perspective view which shows the guide member which guides the movement of a connection member. It is explanatory drawing which shows the connection member which moves in response to rotation of a pulley, (A) is an initial state, (B) is a moving direction of a connection member when rotating a 1st pulley counterclockwise, (C). Indicates the moving direction of the connecting member when the first pulley rotates clockwise. It is explanatory drawing which shows the internal structure of a connection member, and has shown the initial state in which bending operation is not performed. It is explanatory drawing which shows the state which rotated the 1st pulley counterclockwise and absorbed the play of the connection member by the side of a tension | pulling. It is explanatory drawing which shows the state which the connection member by the side of a tension | pulling moves toward the 1st pulley, and the connection member by the side of Yurumi moves toward the front-end | tip of an insertion direction. It is explanatory drawing which shows the connection part of another embodiment by which the edge part of a wire passes when absorbing slack, and each other wire is distribute | arranged on the same straight line when transmitting tensile force. It is explanatory drawing which shows other embodiment distribute | arranged to the position which brought the connection member close to the pulley. It is explanatory drawing which shows embodiment which provided the stopper guide path along the outer periphery of a pulley.

Explanation of symbols

23, 24 Pulley 25, 35 P wire 29, 38 A wire 30, 39 B wire 27, 28, 36, 37 Connecting member 51a, 51b, 52a, 52b, 74, 77 Engagement part (prevention part)
53, 54, 81 Insertion hole (guide part)
58, 59, 75, 82 Contact wall (preventing part)

Claims (12)

An endoscope bending operation device for bending a bending portion provided in front of a distal end of an insertion portion of an endoscope inserted into a subject,
An operation member provided on a proximal end side of the insertion portion;
A wire having at least one portion divided and having both ends attached to the bending portion through the insertion portion;
A pulling member that pulls the wire in conjunction with the operation of the operating member;
The pair of first and second split ends of the wire are connected to each other, and the slack of the wire absorbs at least the first split end so that the first and second split ends pass each other. An endoscope bending operation device comprising: a connecting member that is movably held within a possible range.   The endoscope bending operation device according to claim 1, wherein the pulling member is a pulley that is wound around the wire and rotates. The connecting member is connected in a direction that absorbs slackness of the wire from an inlet through which the first divided end is inserted, and a first guide portion that guides the first divided end in a floating direction;
2. A first retaining portion that engages with an engaging portion fixed to the first divided end and prevents the first divided end from coming out of the inlet. Or the endoscope bending operation apparatus of 2.   Further, the connecting member has a second guide portion and a second retaining member corresponding to the second divided end, similarly to the first guide portion and the first retaining portion corresponding to the first divided portion. The endoscope bending operation device according to claim 3, further comprising a portion.   5. The outlet according to claim 3, wherein at least the first guide portion is provided with an outlet through which each of the first divided ends protrudes when the first divided ends move freely. Endoscope bending operation device. The retaining portion of the first guide portion is arranged to be shifted from the axis of the wire connected to the second divided end,
The endoscope bending operation device according to claim 4 or 5, wherein the first guide portion is formed in a straight line shape. The retaining portion of the first guide portion is disposed on an axis of the wire connected to the second divided end;
The endoscope bending operation device according to claim 3 or 4, wherein the first guide portion is formed to be bent.   The endoscope bending operation device according to claim 7, wherein the second guide portion is formed in a linear shape.   The endoscope bending operation device according to claim 7 or 8, wherein the first guide portion is formed in a curved shape with a radius of curvature equal to or greater than a pulley around which the wire is wound.   The endoscope bending operation device according to claim 1, wherein the connecting member is provided in the vicinity of the pulling member.   The endoscope bending operation device according to claim 10, wherein the first guide portion extends in the vicinity of the pulling member. In an endoscope in which a bending portion is arranged in front of the distal end of the insertion portion to be inserted into the subject,
An operation member provided on a proximal end side of the insertion portion;
A wire having at least one portion divided and having both ends attached to the bending portion through the insertion portion;
A pulling member that pulls the wire in conjunction with the operation of the operating member;
The pair of first and second split ends of the wire are connected to each other, and the slack of the wire absorbs at least the first split end so that the first and second split ends pass each other. An endoscope comprising: a connecting member that is movably held within a possible range.

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