JP2017213061A - Wire push/pull device and endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire push/pull device capable of preventing an operation wire from buckling by a falling operation of a standing table without affecting an operational feeling, and an endoscope equipped with the wire push/pull device.SOLUTION: A wire push/pull device includes a link mechanism connected to an operation member in an operation part, which includes a slider slidably moving in a wire axial direction of an operation wire according to an operation, and a connection part for connecting the slider and a wire end of the operation wire in the operation part, which is connected to the slider on one end side in the wire axial direction, and holds the wire end so as to move it in the wire axial direction on the other end side in the wire axial direction.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a wire push-pull device that pushes and pulls an operation wire that rotates a stand, and an endoscope that includes this wire push-pull device.

  In an endoscope, various treatment tools are introduced from a treatment tool introduction port of an operation unit, and the treatment tool is led out from a treatment tool outlet port opened at a distal end portion of an insertion unit to perform treatment. For example, a treatment tool such as a guide wire or a contrast tube is used in a duodenoscope (side endoscope), a treatment tool such as a puncture needle is used in an ultrasonic endoscope, and forceps in other direct and perspective endoscopes Alternatively, a treatment tool such as a snare is used. Such a treatment tool needs to change the derivation direction at the distal end of the insertion portion in order to treat a desired position in the subject. For this reason, the stand which changes the derivation | leading-out direction of a treatment tool is rotatably provided in the front-end | tip part of the insertion part.

  An operation wire arranged from the distal end of the insertion portion to the operation portion is directly connected (wire pulling type) or indirectly connected via a lever (lever type) to the stand. The operation wire is protected by a sheath in the insertion portion, and the operation wire moves back and forth within the sheath. The sheath has a flexible structure in which the inner side is formed of a close contact spring and the outer side is formed of a resin tube (or the reverse combination).

  The operation unit is provided with a standing operation lever (operation member) and a link mechanism connected to the standing operation lever. The link mechanism has a slider that slides in the wire axis direction of the operation wire in accordance with the operation of the standing operation lever. The slider is connected to the wire end of the operation wire. Thereby, the operation wire is pushed and pulled in the insertion portion through the slider of the link mechanism by the operation of the standing operation lever, so that the posture of the stand can be displaced between the lying position and the standing position.

  In the endoscope described in Patent Document 1, the slider of the link mechanism and the wire end of the operation wire are connected via a spring in the operation unit. Thereby, in the endoscope of Patent Document 1, when performing an erecting operation for rotating the erecting base to the erecting position, a spring extends when a tensile force of a predetermined value or more is applied to the operating wire. The above pulling force is prevented from acting.

  In the endoscope described in Patent Document 2, a wire connection portion is provided in the middle of an operation wire used for a bending operation of the distal end portion of the insertion portion. One end side of the wire connection portion is connected to the wire end portion of the first operation wire arranged from the distal end of the insertion portion to the operation portion. The first operation wire is covered with a coil spring. On the other hand, the other end portion of the wire connection portion holds the wire end portion of the second operation wire wound around the pulley connected to the bending operation knob in the operation portion so as to be movable in the wire axis direction. These coil springs and wire connecting portions prevent the first operation wire and the second operation wire from meandering when the bending operation knob is rotated (bending operation).

  In the endoscope described in Patent Document 3, a wire relaxation absorption frame that absorbs the relaxation of the operation wire is provided in the middle of the operation wire used for the bending operation of the distal end portion of the insertion portion, and this wire relaxation absorption frame is further provided. A shock absorbing member is provided in the body for absorbing the shock when the wire relaxation absorbing frame collides with the bending stopper in the operation portion. Thereby, even when a sharp bending operation is performed, damage to the operation wire can be prevented.

JP 2003-245248 A JP 2009-172028 A JP 2010-51543 A

  By the way, the function required for the operation wire for rotating the stand is to rotate the stand to the standing position by pulling the operation wire in the insertion portion, and to rotate the stand to the lying position by pushing the operation wire. That is. Further, the function required of the sheath is that it is difficult to expand and contract with respect to the pulling force and pushing force of the operation wire. The operation wire for rotating the stand as described above is different in function from the operation wire for bending operation in that an operation for pushing the operation wire is required.

  FIG. 17 is an explanatory diagram for explaining a problem of the related art. As shown in FIG. 17, when the insertion part of the endoscope is inserted into the body cavity, the insertion part is inserted along the digestive tract or the like. For this reason, the insertion portion may change from a straight state as indicated by reference numeral 200 in the upper part of FIG. 17 to a loop state in which a loop as indicated by reference numeral 201 in the lower part of FIG.

  In this loop state 201, when a lying operation for rotating the stand up to the lying position, that is, an operation for pushing the operating wire 203 (indicated by an arrow PS in the figure), the operating wire 203 passes through the center of the sheath 204. Instead, it is pushed along the inner surface 204 a outside the loop in the sheath 204. For this reason, in the loop state 201, compared with the straight state 200, the pushing amount of the operation wire acting on the stand is shortened by the tilting operation of the stand operation lever. Accordingly, in order to reliably rotate the stand up to the fall position (full down) even in the loop state 201, it is necessary to secure a sufficient length of the operation wire and a sufficient amount of pushing the operation wire during the fall operation. There is.

  However, when a sufficient amount of pushing the operation wire during the lying down operation in the loop state 201 is secured, the extra length (play allowance) of the operation wire in the straight state 200 increases. This extra length indicates that in the straight state 200, the standing operation lever can be further rotated in the same direction from the state in which the standing operation lever is rotated until the stand is fully lowered to the lying position. When the standing operation lever is further rotated in the same direction, the operation wire is bent in the sheath or the like. For this reason, when the extra length is increased, the operation wire is buckled. As a result, the operation wire may be deteriorated.

  In the endoscope described in Patent Document 1, the slider of the link mechanism and the wire end of the operation wire are connected by a spring, but this pulls the operation wire with an excessive force when the stand is raised. In order to prevent disconnection of the operation wire in this case, it is impossible to prevent buckling of the operation wire during the above-described lying down operation. In addition, when the upright is fully raised to the upright position, a strong force is required for the pulling force (traction force) of the operation wire. If a strong spring is used, the effect of preventing the disconnection of the operation wire will be reduced. If it is used, the feeling of operation becomes worse. Further, a time lag is generated between the standing operation by the standing operation lever (the pulling operation of the operation wire) and the standing base in response to the pulling operation due to the extension of the spring. As a result, the operational feeling is adversely affected.

  The above Patent Document 2 is an invention for the purpose of preventing meandering of the operation wire at the time of bending operation of the insertion portion, and is not intended to prevent buckling of the operation wire. Further, if the invention described in Patent Document 2 is applied to an upright stand driving mechanism, the operation wire needs to be covered with a coil spring, so that the insertion portion becomes thick. In recent years, since the insertion portion is required to have a smaller diameter, the method described in Patent Document 2 cannot be used.

  Patent Document 3 described above aims to prevent damage to the operation wire during the bending operation (traction operation) of the insertion portion, and is not intended to prevent buckling of the operation wire. Further, even if the invention described in Patent Document 3 is applied to an upright stand drive mechanism, the above-described buckling of the operation wire cannot be prevented.

  The present invention has been made in view of such circumstances, and a wire push-pull device that can prevent buckling of an operation wire due to a lying operation of a stand without affecting the feeling of operation, and the wire push-pull An object is to provide an endoscope including the apparatus.

  A wire push-pull device for achieving the object of the present invention includes an insertion portion having a distal end and a proximal end, an operation portion connected to the proximal end side of the insertion portion, and an operation member provided in the operation portion. The stand is rotatably provided at the distal end side of the insertion portion, and is disposed from the distal end of the insertion portion to the operation portion, and is rotated by being pushed and pulled according to the operation of the operation member. In a wire push-pull device provided in an endoscope provided with an operation wire, a link mechanism connected to an operation member within an operation portion, and a slider that slides in the wire axis direction of the operation wire in accordance with an operation And a connecting portion for connecting the slider and the wire end of the operation wire in the operation portion, connected to the slider on one end side in the wire axial direction, and connected to the wire end on the other end side in the wire axial direction. Part A connecting portion that is movably held in the ear axis direction, and the wire axis direction is a first direction in which the operation wire is pushed into the distal end side of the insertion portion, and a second direction in which the operation wire is drawn into the proximal end side of the insertion portion. When the connection portion is moved in the first direction by the operation through the slider, the connection portion moves relative to the wire end portion in the first direction to reduce the distance between the slider and the wire end portion. When moved in two directions, the wire end is moved integrally in the second direction.

  According to this wire push-pull device, when the operation wire is pushed into the distal end side of the insertion part, the distance between the slider and the wire end is shortened to connect a part of the push-in amount (extra length) of the operation wire. It can be absorbed by the portion and the buckling of the operation wire can be prevented. Further, when the operation wire is drawn to the proximal end side of the insertion portion, the wire end portion can be drawn in the second direction integrally with the connection portion, so that a direct operational feeling can be given to the operator.

  In the wire pushing / pulling device according to another aspect of the present invention, when the connecting portion is moved in the first direction, the distance is reduced according to the magnitude of the load applied to the connecting portion from the slider. Thereby, a part (extra length) of the pushing amount of the operation wire can be absorbed by the connecting portion, and buckling of the operation wire can be prevented.

  In the wire pushing / pulling device according to another aspect of the present invention, when the connecting portion is moved in the first direction, the wire end portion is further moved when the load applied to the connecting portion from the slider is less than a predetermined value. When the load is a certain value or more, the distance is shortened according to the magnitude of the load. Thereby, a part (extra length) of the pushing amount of the operation wire can be absorbed by the connecting portion, and buckling of the operation wire can be prevented.

  In the wire push-pull device according to another aspect of the present invention, a holding hole that is formed at an end portion in the first direction of the connecting portion and that holds the wire end portion movably in the wire axial direction, and is provided in the holding hole, A resistance applying unit that applies resistance to movement of the wire end in the holding hole when the connecting unit is moved in the first direction. Thereby, when the load which resists the resistance force by the resistance applying part is given to the connecting part, the distance between the slider and the wire end part can be reduced to prevent the operation wire from buckling.

  In the wire push-pull device according to another aspect of the present invention, the wire push-pull device includes a movement restricting portion that is provided at an end portion of the holding hole in the first direction and restricts movement of the wire end portion in the first direction. As the resistance force, an urging force that urges the wire end toward the movement restricting portion is applied to the wire end, and the wire end receives the urging force from the resistance applying portion when the operation wire is unloaded. In contact with the movement restricting portion. Thereby, when the operation wire is drawn to the proximal end side of the insertion portion, the wire end portion can be drawn in the second direction integrally with the connection portion, so that a direct operational feeling can be given to the operator. .

  In the wire push-pull device according to another aspect of the present invention, a bottom portion is provided at an end portion in the second direction of the holding hole, and the resistance applying portion is provided between the wire end portion and the bottom portion in the holding hole. Spring member. Thereby, when the load which resists the resistance force by the resistance applying part is given to the connecting part, the distance between the slider and the wire end part can be reduced to prevent the operation wire from buckling.

  In the wire pushing / pulling device according to another aspect of the present invention, the resistance applying portion is a friction plate provided on the inner surface of the holding hole. Thereby, when the load which resists the resistance force by the resistance applying part is given to the connecting part, the distance between the slider and the wire end part can be reduced to prevent the operation wire from buckling.

  In the wire push-pull device according to another aspect of the present invention, a bottom portion is provided at an end portion in the second direction of the holding hole, and the resistance applying portion is provided between the wire end portion and the bottom portion in the holding hole. And a damper chamber sealed with gas or liquid. Thereby, when the load which resists the resistance force by the resistance applying part is given to the connecting part, the distance between the slider and the wire end part can be reduced to prevent the operation wire from buckling.

  In the wire push-pull device according to another aspect of the present invention, the resistance applying portion is provided between the first magnet provided at the end portion in the first direction of the holding hole and the first magnet provided at the wire end portion. And a second magnet for generating an attractive force. Thereby, when the load which resists the resistance force by the resistance applying part is given to the connecting part, the distance between the slider and the wire end part can be reduced to prevent the operation wire from buckling.

  In the wire push-pull device according to another aspect of the present invention, the resistance applying portion is provided between the first magnet provided at the end portion in the second direction of the holding hole and the first magnet provided at the wire end portion. And a second magnet for generating repulsive force. Thereby, when the load which resists the resistance force by the resistance applying part is given to the connecting part, the distance between the slider and the wire end part can be reduced to prevent the operation wire from buckling.

  In the wire push-pull device according to another aspect of the present invention, a movement restricting portion that restricts movement of the wire end portion in the first direction is provided at the end portion of the holding hole in the first direction, and the movement restriction portion is provided. When the connecting portion is moved in the second direction, the portion abuts on the wire end portion and integrally moves the wire end portion in the second direction. Thereby, a direct operational feeling can be given to the operator.

  An endoscope for achieving the object of the present invention includes an insertion portion having a distal end and a proximal end, an operation portion connected to the proximal end side of the insertion portion, an operation member provided in the operation portion, An upright stand that is rotatably provided at the distal end side of the insertion portion and an operation that is arranged from the distal end of the insertion portion to the operation portion and is rotated by pushing and pulling according to the operation of the operation member. A wire and the wire push-pull device described above are provided.

  The wire push-pull device and endoscope according to the present invention can prevent buckling of the operation wire due to the lying down of the stand without affecting the operational feeling.

1 is an overall view of an ultrasonic endoscope (endoscope) that is an embodiment of an endoscope to which the present invention is applied. It is the perspective view which expanded and showed the front-end | tip part of the insertion part. It is an enlarged view of an operation part. It is the schematic which showed simply the structure of the stand drive mechanism in an operation part. It is the block diagram which showed an example of the power transmission mechanism in the front-end | tip part in FIG. It is sectional drawing of the connection part shown in FIG. It is an enlarged view of the connection part shown in FIG. It is explanatory drawing for demonstrating the state by which the connection part was pushed in the 1st direction A rather than the position shown in FIG. It is explanatory drawing for demonstrating the state by which the connection part was pushed further in the 1st direction A rather than the position shown in FIG. It is the graph which showed an example of the relation between load F and distance L. It is explanatory drawing for demonstrating operation | movement of the connection part at the time of standing operation. It is the schematic of the connection part of the comparative example which is connected with the wire end part of the operation wire on the 1st direction A side, and hold | maintained the slider so that a movement to a wire axial direction is possible on the 2nd direction B side. It is sectional drawing of the connection part of the endoscope of 2nd Embodiment. It is sectional drawing of the connection part of the endoscope of 3rd Embodiment. It is sectional drawing of the connection part of the endoscope of 4th Embodiment. It is sectional drawing of the connection part of the endoscope of 5th Embodiment. It is explanatory drawing for demonstrating the subject of a prior art.

[Configuration of Ultrasound Endoscope of First Embodiment]
FIG. 1 is an overall view of an ultrasonic endoscope (hereinafter simply referred to as an endoscope) 1 as an embodiment of an endoscope to which the present invention is applied. As shown in FIG. 1, an endoscope 1 is connected to an insertion portion 10 to be inserted into a subject (into a body cavity) and a proximal end side of the insertion portion 10, and is held by an operator to perform various operations. An operation unit 12 to be performed and a universal cord 14 connected to the operation unit 12 are provided.

  The insertion portion 10 is formed in a long shape with a small diameter as a whole. The insertion portion 10 includes a flexible portion 30 having flexibility in order from the proximal end side to the distal end side, a bending portion 32 that can be bent by the operation of the operation portion 12, an imaging device (not shown), and an ultrasonic transducer. 50 (electromagnetic acoustic transducer, see FIG. 2) and the like are arranged continuously.

  The operation unit 12 is provided with various operation members operated by an operator. Specifically, the operation unit 12 includes a left / right bending operation knob 70 and an up / down bending operation knob 72 which are bending operation knobs, a standing operation lever 74 corresponding to the operation member of the present invention, an air / water supply button 80, and a suction button. 82 are provided.

  Further, the operation unit 12 is provided with a treatment instrument introduction port 24 for inserting a treatment instrument into a treatment instrument insertion passage (treatment instrument insertion channel) that is inserted through the insertion section 10.

  The universal cord 14 is a connection cord for connecting the endoscope 1 to a system component device including a processor device (not shown) and a light source device that constitute the endoscope system. The universal cord 14 includes an electric cable, a light guide, and a fluid tube. In addition, a connector is provided at an end (not shown) of the universal cord 14.

  By connecting the connector of the universal cord 14 to the system component device, power, control signals, illumination light, liquid and gas necessary for the operation of the endoscope 1 are supplied from the system component device to the endoscope 1. Is done. The observation image data acquired by the imaging device of the distal end portion 34 and the ultrasonic image data acquired by the ultrasonic transducer 50 (see FIG. 2) of the distal end portion 34 are configured from the endoscope 1 as a system configuration. Transmitted to the device. The observation image and the ultrasonic image transmitted to the system configuration apparatus are displayed on the monitor.

  FIG. 2 is an enlarged perspective view of the distal end portion 34 of the insertion portion 10. As shown in FIG. 2, the distal end portion 34 includes a base portion 40 disposed on the proximal end side and an extending portion 42 extending from the base portion 40 toward the distal end side.

  The extending portion 42 is provided with a convex ultrasonic transducer 50 in which a large number of ultrasonic transducers for transmitting and receiving ultrasonic waves are arranged along an arcuate ultrasonic wave transmitting / receiving surface. Thereby, an ultrasonic image (tomographic image) on a scanning plane parallel to the axis of the insertion unit 10 is acquired by the ultrasonic transducer 50. The ultrasonic image data is transmitted to the system configuration device via a signal cable that passes through the insertion unit 10, the operation unit 12, and the universal cord 14.

  The base 40 is formed with a left slope 41L and a right slope 41R that face obliquely upward on the distal end side. An observation window 44, an air / water supply nozzle 48, and an illumination window 46L are provided on the left slope 41L. An illumination window 46R is provided on the right slope 41R. Furthermore, a treatment instrument outlet 58 is provided between the left slope 41L and the right slope 41R.

  An imaging device in which the imaging optical system and the solid-state imaging device are integrally assembled is disposed inside the base 40 which is the back side of the observation window 44. Thereby, the captured image data of the observed region within the field of view of the imaging device is acquired. This captured image data is transmitted to the system component device connected to the universal cord 14 via the signal cable described above.

  A light emitting portion is disposed inside the base 40 on the back side of each of the illumination windows 46R and 46L. Illumination light is guided from the system component device to the light emitting unit via a light guide that passes through the insertion unit 10, the operation unit 12, and the universal cord 14. Thereby, the illuminating light emitted from the light emitting part is irradiated to the site to be observed from the illumination windows 46R and 46L.

  The air / water supply nozzle 48 is connected to the system component device via a fluid tube that passes through the insertion portion 10, the operation portion 12, and the universal cord 14. As a result, the gas or water supplied from the system component apparatus is jetted from the air / water supply nozzle 48 toward the observation window 44, and the observation window 44 is cleaned.

  The treatment instrument derivation unit 58 has a concave treatment instrument erection space 62, and a treatment instrument derivation port 64 is disposed on the proximal end side of the treatment instrument erection space 62.

  The treatment instrument outlet 64 communicates with the treatment instrument introduction port 24 (see FIG. 1) of the operation unit 12 through a treatment instrument insertion passage (treatment instrument insertion channel) inserted into the insertion section 10. As a result, the treatment tool inserted from the treatment tool introduction port 24 is led out from the treatment tool outlet 64 to the treatment tool standing space 62.

  In the treatment instrument standing space 62, a treatment instrument stand 60 (hereinafter simply referred to as a stand) is rotatably provided on the distal end side of the treatment instrument outlet 64.

  On the upper surface side of the stand 60, a concave guide surface 60 a that is curved upward from the proximal end side toward the distal end side is formed. The treatment tool led out from the treatment tool lead-out port 64 abuts on the guide surface 60a of the stand 60 and curves upward. Thereby, the derivation direction of the treatment instrument led out from the opening 66 of the treatment instrument standing space 62 is changed by the standing stand 60 and protrudes in an upward oblique direction.

  FIG. 3 is an enlarged view of the operation unit 12. As shown in FIG. 3, the operation unit 12 is surrounded by a casing 13 that is an operation unit main body that defines the inside and the outside of the operation unit 12. On the right side surface 13R of the operation unit 12 formed by the housing 13, a left / right bending operation knob 70, an up / down bending operation knob 72, a standing operation lever 74, a left / right lock knob 76, and an up / down lock lever 78 are provided. Is provided.

  The left / right bending operation knob 70, the up / down bending operation knob 72, the standing operation lever 74, the left / right lock knob 76, and the up / down lock lever 78 of the operation unit 12 rotate around an axis substantially orthogonal to the right side surface 13 </ b> R. It is provided freely. When the left / right bending operation knob 70 and the up / down bending operation knob 72 are rotated, the bending portion 32 is bent in the left / right direction and the up / down direction. When the left / right lock knob 76 and the up / down lock lever 78 are rotated, the rotation positions of the left / right bending operation knob 70 and the up / down bending operation knob 72 are locked or unlocked.

  When the standing operation lever 74 is rotationally operated, as will be described in detail later, the standing base 60 operates (rotates) in the direction in which it stands or falls, and the angular position (standing angle) of the stand 60 is changed. Thereby, the derivation direction (derivation angle) of the treatment instrument derived from the treatment instrument deriving portion 58 of the distal end portion 34 is changed.

  Further, an air / water supply button 80, a suction button 82, and the like are provided on the upper surface 13U of the operation unit 12. By operating the air / water supply button 80, the injection of gas or water from the air / water supply nozzle 48 is turned on or off. Further, by operating the suction button 82, suction from the treatment instrument outlet 58 can be turned on or off through a suction channel connected to the treatment instrument insertion path. The universal cord 14 is connected to the lower surface 13D of the operation unit 12.

  Next, with reference to FIG. 4, the upright stand driving mechanism 100 for raising or lowering the upright stand 60 of the distal end portion 34 by rotating the upright operation lever 74 of the operation portion 12 will be described. FIG. 4 is a schematic diagram simply showing the configuration of the upright stand driving mechanism 100 in the operation unit 12. The stand driving mechanism 100 corresponds to the wire pushing / pulling device of the present invention.

  As shown in FIG. 4, a base plate 102 parallel to the right side surface 13 </ b> R shown in FIG. 3 described above is provided in the operation unit 12, and an upright stand drive mechanism 100 is provided on the base plate 102. It has been. The stand drive mechanism 100 causes the stand 60 to fall or stand by pushing and pulling the operation wire 98 disposed from the distal end of the insertion unit 10 to the operation unit 12 according to the rotation operation of the stand operation lever 74. The upright stand driving mechanism 100 includes a link mechanism 104 and a connecting portion 105.

  The link mechanism 104 includes a rotating drum 107, a crank member 108, and a slider 109. The rotating drum 107 is rotatably held in a fixed angle range by a rotating shaft 107a provided on the base plate 102 and perpendicular to the base plate 102 (right side surface 13R). A standing operation lever 74 is attached to the rotating drum 107. Further, one end side of the crank member 108 is rotatably connected to the rotating drum 107.

  One end side of the slider 109 is rotatably connected to the other end side of the crank member 108. The slider 109 is supported by a guide tube 111 via a connecting portion 105 described later so as to be slidable (advance and retreat) in the wire axis direction of the operation wire 98. On the other hand, a connecting portion 105 is connected to the other end side of the slider 109.

  The connecting portion 105 is supported by the guide tube 111 so as to be slidable in the wire axis direction. As will be described later in detail, the connecting portion 105 connects the slider 109 and the wire end portion 98a (see FIG. 6) on the proximal end side of the operation wire 98 in the operation portion 12. Accordingly, the slider 109 and the connecting portion 105 are slid in the wire axis direction by the rotation operation of the standing operation lever 74. The wire axial direction includes a first direction A in which the operation wire 98 is pushed into the distal end side of the insertion portion 10 and a second direction B in which the operation wire 98 is drawn toward the proximal end side of the insertion portion 10.

  The operation wire 98 extends from the inside of the operation unit 12 to the inside of the insertion unit 10 and is inserted and arranged to the distal end portion 34. The operation wire 98 is disposed inside the insertion portion 10 so as to be capable of moving forward and backward within the sheath 99. As described above, the sheath 99 has a flexible structure in which the inner side is formed of a contact spring and the outer side is formed of a resin tube (or vice versa).

  In the distal end portion 34, an upright stand 60 is connected to the distal end of the operation wire 98 through an upright lever 126 of the in-front end power transmission mechanism 101 described later. The proximal end side of the stand 60 is supported so as to be rotatable with respect to the distal end portion 34. Thus, when the operation wire 98 is pushed into the distal end side of the insertion portion 10 due to the movement of the slider 109 and the connecting portion 105 in the first direction A, the upright 60 is centered on the proximal end side (rotation shaft 122 described later). Rotate to the lying position. Further, when the operation wire 98 is pulled to the proximal end side of the insertion portion 10 due to the movement of the slider 109 and the connecting portion 105 in the second direction B, the upright 60 rotates to the standing position around the proximal end side.

  FIG. 5 is a configuration diagram showing an example of the power transmission mechanism 101 in the distal end portion in FIG. As shown in FIG. 5, in the distal end portion 34, one of the pair of wall portions forming the treatment instrument standing space 62 of the treatment instrument derivation section 58 shown in FIG.

  The lever housing 120 pivotally supports a rotary shaft 122 provided so as to penetrate the lever housing 120. One end side of the rotating shaft 122 protrudes into the treatment instrument standing space 62, and the other end side protrudes into a lever accommodating space portion 124 formed in the lever accommodating body 120.

  One end of the rotating shaft 122 is fixed to the base end of the stand 60 (see FIG. 4). On the other hand, on the other end side of the rotating shaft 122, an end portion on the proximal end side of the upright lever 126 accommodated and disposed in the lever accommodating space 124 is fixed. The distal end of the operation wire 98 is rotatably connected to the end portion on the distal end side of the rising lever 126 via a connecting pin that is rotatable with respect to the rising lever 126.

  When the operation wire 98 moves forward and backward in the first direction A or the second direction B by the rotation operation of the standing operation lever 74, the standing lever 126 rotates integrally with the rotation shaft 122 around the rotation shaft 122. Then, by the rotation of the rotating shaft 122, the stand 60 rotates between the lying position (indicated by a solid line) and the standing position (indicated by a two-dot chain line) around the rotating shaft 122. Hereinafter, the rotation operation of the standing operation lever 74 that rotates the stand 60 to the lying position is referred to as a tilting operation, and the rotation operation of the standing operation lever 74 that rotates the stand 60 to the standing position is referred to as the standing operation.

  As described above with reference to FIG. 17, when the insertion portion 10 is in a loop state, the pushing amount of the operation wire 98 acting on the stand 60 is shortened by the tilting operation of the stand operation lever 74. For this reason, even when the insertion portion 10 is in a loop state, the length of the operation wire 98 is sufficiently ensured so that the pushing amount of the operation wire 98 during the lying down operation can be sufficiently ensured. The rotation angle range of the standing operation lever 74 is set larger than the operation range (rotation angle range) of the stand 60.

  The distal end of the sheath 99 through which the operation wire 98 is inserted is fixed to the proximal end side of the lever housing 120. Moreover, the pipe member 129 in the drawing is a member that forms a treatment instrument insertion channel, and is connected so as to communicate with the treatment instrument introduction port 24.

  Note that the distal end portion power transmission mechanism 101 is not limited to the configuration shown in FIG. For example, the tip of the operation wire 98 may be directly connected to the stand 60 (wire pulling type), or the tip of the operation wire 98 may be indirectly connected to the stand 60 by a method different from the present embodiment. It is good also as the structure which carried out.

  Further, since the bending portion driving mechanism for bending the bending portion 32 in the vertical direction and the horizontal direction in accordance with the rotation operation of the left / right bending operation knob 70 and the up / down bending operation knob 72 is a known technique, a specific description thereof is omitted. To do.

<Configuration of connection part>
6 is a cross-sectional view of the connecting portion 105 shown in FIG. FIG. 7 is an enlarged view of the connecting portion 105 shown in FIG. As shown in FIGS. 6 and 7, the guide tube 111 supporting the connecting portion 105 has a cylindrical shape extending in the wire axial direction (first direction A and second direction B), and is attached to the mounting member. It is fixed to the base plate 102 (see FIG. 4) via 130. A connector 131 is attached to the opening of the guide tube 111 on the first direction A side. A base end portion of the sheath 99 (protection pipe) is supported by the connector 131 in a state of penetrating the connector 131. As a result, the proximal end of the operation wire 98 is inserted into the guide tube 111.

  The connecting portion 105 has a substantially cylindrical shape having an outer diameter corresponding to the inner diameter of the guide tube 111 and is slidably inserted into the guide tube 111. That is, the connecting portion 105 is supported by the guide tube 111 so as to be slidable in the wire axis direction (first direction A and second direction B).

  A slider 109 is connected to an end of the connecting portion 105 on the second direction B side (one end side in the wire axis direction of the present invention) via a connecting member 134. The connecting portion 105 and the slider 109 may be directly connected without using the connecting member 134. Further, the end portion of the connecting portion 105 on the first direction A side (the other end side in the wire axis direction of the present invention) holds the wire end portion 98a on the proximal end side of the operation wire 98 so as to be movable in the wire axis direction. ing. A substantially cylindrical piston 135 extending in the wire axial direction is fixed to the wire end portion 98a. For example, the piston 135 is soldered to the wire end portion 98a by pouring solder (not shown) into a hole formed in the piston 135.

  A holding hole 136 (also referred to as a cylinder) that holds the wire end portion 98a movably in the wire axis direction is formed in the end portion on the first direction A side of the connecting portion 105. The inner diameter of the holding hole 136 is formed to match the outer diameter of the piston 135 described above. Thereby, the piston 135 and the wire end portion 98a (hereinafter abbreviated as the wire end portion 98a and the like) are held by the holding hole 136 so as to be movable in the wire axis direction.

  A substantially annular movement restricting portion 138 having an insertion hole through which the operation wire 98 can be inserted closes the opening portion of the holding hole 136 on the first direction A side at the end portion on the first direction A side of the holding hole 136. It is provided as follows. The movement restricting portion 138 restricts the movement of the wire end portion 98a and the like in the first direction A. Further, when the slider 109 and the connecting portion 105 move in the second direction B in response to the standing operation of the standing operation lever 74, the movement restricting portion 138 contacts the wire end portion 98a and the wire end portion 98a and the like. Move in the second direction B integrally.

  A bottom portion 136a is formed at the end portion of the holding hole 136 on the second direction B side. In the holding hole 136, a spring member 140 such as a compression coil spring is provided between the wire end portion 98a and the bottom portion 136a.

  The spring member 140 applies a biasing force f (see FIG. 7) that biases the wire end portion 98a and the like toward the first direction A (that is, biases toward the movement restricting portion 138). As a result, the wire end 98a and the like abut against the movement restricting portion 138 by receiving a biasing force f from the spring member 140 when the operation wire 98 is in an unloaded state (that is, not in a loaded state described later). Here, the load state of the operation wire 98 is, for example, the state in which the upright 60 is in the lying position, and the operation wire 98 is further pushed into the first direction A, whereby the operation wire 98 is moved in the first direction A. It is in a state where a load that resists movement to is given.

  Here, when the slider 109 and the connecting portion 105 move in the first direction A in response to the tilting operation of the standing operation lever 74, the urging force f of the spring member 140 moves the wire end portion 98a and the like in the holding hole 136. Resistance to (movement in the second direction B). For this reason, the spring member 140 functions as a resistance applying portion of the present invention.

  The spring member 140 does not shrink when a load in the first direction A larger than the above-described resistance force is not applied, and a distance L (see FIG. 6) between the slider 109 and the wire end portion 98a or the like. Keep constant. Specifically, when the operation wire 98 is in the above-described unloaded state, the load in the first direction A applied to the spring member 140 is small, and the above-described distance L is constant without the spring member 140 contracting. Kept.

  On the other hand, when a load in the first direction A that is greater than the above-described resistance force is applied, the spring member 140 contracts according to the magnitude of the load, thereby reducing the distance L described above. As described above, in this embodiment, even when the insertion portion 10 is in a loop state, the length of the operation wire 98 is adjusted so that the pushing amount of the operation wire 98 during the lying down operation is sufficiently secured. . For this reason, when the insertion portion 10 is in the straight state, the operation wire 98 is further extended from the state in which the upright 60 is rotated to the lying position, and the operation wire 98 is moved by the extra length of the operation wire 98 (also called play allowance). Pushing operation becomes possible. Thereby, since the operation wire 98 is in a loaded state, the load in the first direction A applied to the spring member 140 is increased, and the distance L is also reduced by the spring member 140 being contracted.

<Operation of connecting part during lodging operation>
Next, with reference to FIGS. 8 and 9, the operation (action) of the upright stand driving mechanism 100, particularly the connecting portion 105, during the overturning operation will be described. FIG. 8 is an explanatory diagram for explaining a state in which the connecting portion 105 is pushed in the first direction A from the position shown in FIG. FIG. 9 is an explanatory diagram for explaining a state in which the connecting portion 105 is pushed further in the first direction A than the position shown in FIG.

  When the surgeon starts to incline the standing operation lever 74, the slider 109 moves in the first direction A via the rotating drum 107 and the crank member 108, and the slider 109 moves to the connecting portion 105 via the connecting member 134. A load F in one direction A is given. As a result, the connecting portion 105 moves in the first direction A within the guide tube 111 as shown in FIG.

  At this time, the magnitude of the load F in the first direction A applied from the slider 109 to the connecting portion 105, that is, the magnitude of the force for relatively moving the wire end 98 a and the like in the second direction B within the holding hole 136, When it is less than a certain value corresponding to the urging force f (resistance force) of the spring member 140, the distance L is kept constant without the spring member 140 contracting. As a result, the wire end portion 98 a and the like move integrally with the connection portion 105 in the first direction A, and the operation wire 98 is pushed in the first direction A within the insertion portion 10. As a result, the stand 60 is rotated toward the lying down position by the in-front-end power transmission mechanism 101 shown in FIG.

  Here, in the present embodiment, the length of the operation wire 98 is sufficiently ensured so that the pushing amount of the operation wire 98 at the time of the lying down operation can be sufficiently ensured even when the insertion portion 10 is in a loop state. The rotation angle range of the standing operation lever 74 is set to be larger than the operation range of the stand 60. For this reason, even if the standing operation lever 74 is tilted even after the stand 60 reaches the lying position, the operating wire 98 is further pushed in the first direction A, so that the operating wire 98 is in a loaded state. . As a result, the load F in the first direction A applied from the slider 109 or the like to the connecting portion 105 due to the overturning operation increases.

  Then, as shown in FIG. 9, when the magnitude of the load F in the first direction A applied from the slider 109 or the like to the connecting portion 105 becomes equal to or greater than the predetermined value, the wire end 98a or the like is spring-loaded in the holding hole 136. The member 140 moves in the second direction B against the bias of the member 140. That is, the connecting portion 105 moves relative to the wire end portion 98a and the like in the first direction A. As a result, the spring member 140 contracts according to the magnitude of the load F described above, and the distance L described above decreases accordingly. As a result, it is possible to absorb a part of the pushing amount of the operation wire 98 due to the lying operation of the standing operation lever 74 by the connecting portion 105 and reduce the pushing amount by the amount absorbed by the connecting portion 105.

  FIG. 10 is a graph showing an example of the relationship between the load F and the distance L. As shown in FIG. 10, when the magnitude of the load F applied from the slider 109 or the like to the connecting portion 105 (spring member 140) is less than the above-described constant value FL, that is, when the operation wire 98 is in an unloaded state, the spring Since the member 140 is not contracted, the distance L is kept constant at the maximum value LH.

  Next, when the magnitude of the load F in the first direction A applied to the connecting portion 105 (spring member 140) is equal to or greater than the predetermined value FL, that is, when the operation wire 98 is in a load state, this load The spring member 140 contracts in accordance with the size of F, and the distance L decreases from the maximum value LH accordingly. When the magnitude of the load F increases to the value FH, the length of the spring member 140 is minimized, and the distance L is also the minimum value LL.

  Therefore, the connecting portion 105 can shorten the distance L by the maximum ΔL (ΔL = LH−LL) in the lodging operation. For this reason, if the surplus length ma of the operation wire 98 when the insertion portion 10 is in a straight state is less than ΔL (ma <ΔL), at least the amount of pushing of the operation wire 98 corresponding to the surplus length ma is determined by the connection portion 105. Can be absorbed. As a result, the operation wire 98 is further prevented from being pushed in the first direction A in the insertion portion 10 in a state where the stand 60 has reached the lying position.

  When the spring constant of the spring member 140 is small, the spring member 140 contracts at the same time (substantially simultaneously) when the load F in the first direction A is applied to the connecting portion 105 (spring member 140) from the slider 109 or the like. Accordingly, the distance L is reduced from the maximum value LH according to the size of the load F.

<Operation of connecting part during standing operation>
FIG. 11 is an explanatory diagram for explaining the operation of the connecting portion 105 during the standing operation. When the surgeon starts the standing operation of the standing operation lever 74, as shown in FIG. 11, a load F in the second direction B is applied from the slider 109 to the connecting portion 105 via the connecting member 134. At this time, the wire end 98a and the like are urging force f from the spring member 140 and restoring force of the treatment instrument curved by the stand 60, and the wire end 98a and the like via the stand 60 and the like. Is received in the first direction A and is in contact with the movement restricting portion 138. For this reason, when the connecting portion 105 is moved in the second direction B by the slider 109 or the like, the movement restricting portion 138 is in contact with the wire end portion 98a or the like as indicated by an arrow PL in the drawing. The part 98a and the like are moved integrally in the second direction B. As a result, the operation wire 98 is pulled in the second direction B within the insertion portion 10. As a result, the stand 60 is rotated toward the standing position by the tip-end power transmission mechanism 101.

  When the standing operation is performed in this manner, the above-described lying operation is performed in order to pull the wire end portion 98a in the second direction B in a state where the movement restricting portion 138 of the connecting portion 105 is in contact with the wire end portion 98a or the like. Unlike the case, regardless of the magnitude of the load F, the operation wire 98 can be pulled in the second direction B while the distance L is kept constant. For this reason, the amount of rotation of the standing operation lever 74 by the standing operation and the amount of pulling of the operation wire 98 (the amount of rotation of the stand 60) can be matched.

[Effect of the first embodiment]
As described above, in the endoscope 1 according to the first embodiment, when the lying down operation is performed, a part of the pushing amount of the operation wire 98 (the extra length ma) can be absorbed by the connecting portion 105. As a result, since the operation wire 98 is further prevented from being pushed in the first direction A in the state where the upright 60 has reached the lying position, buckling of the operation wire 98 is prevented. Further, when the standing operation is performed, the wire end portion 98a and the like can be pulled in the second direction B integrally with the connecting portion 105. Therefore, the rotation amount of the standing operation lever 74 and the pulling amount of the operation wire 98 are obtained. The operator can be given a direct operational feeling. Thereby, it is possible to prevent buckling of the operation wire 98 when the stand 60 is tilted without affecting the operational feeling.

  Further, the connecting portion 105 of the first embodiment is connected to the slider 109 via the connecting member 134 or the like at the end in the second direction B, and has a smaller diameter than the slider 109 at the end in the first direction A. Since the wire end portion 98a of the operation wire 98 is held movably in the wire axis direction, the connecting portion 105 can be reduced in size.

  On the other hand, FIG. 12 is connected to the wire end portion 98a of the operation wire 98 on the first direction A side and holds the slider 109 (or the connecting member 134) on the second direction B side so as to be movable in the wire axis direction. It is the schematic of the connection part 300 of the comparative example. As shown in FIG. 12, the connection portion 300 of the comparative example needs to include a holding hole 300a for holding the slider 109 having a diameter larger than that of the operation wire 98 so as to be movable in the wire axis direction. It will become. As a result, sliding friction between the spring member 140 and the inner surface of the holding hole 300a and sliding friction between the inner surface of the guide tube 111 and the outer surface of the connecting portion 300 increase, and the spring force of the spring member 140 is increased by these sliding friction. Since the loss (that is, the amount of contraction of the spring member 140 is decreased), the extra length ma cannot be sufficiently absorbed by the connecting portion 105.

  In contrast to such a comparative example, the connecting portion 105 of the first embodiment holds the wire end portion 98a of the small-diameter operation wire 98 so as to be movable in the wire axial direction, so that the holding hole 136 is held in the comparative example. The diameter can be made smaller than that of the hole 300a, and as a result, the connecting portion 105 is made smaller than the connecting portion 300 of the comparative example.

  In particular, the spring member 140 that can be used for the connecting portions 105 and 300 is a small member having an inner diameter of about 1.5 to 3.0 mm and a linear shape of about 0.15 to 0.40 mm, so that the acting force is 0. .5 to 3.0 N, and this acting force cannot be increased so much. For this reason, by reducing the size of the connecting portion 105 of the first embodiment, sliding friction between the spring member 140 and the inner surface of the holding hole 136 and sliding friction between the inner surface of the guide tube 111 and the outer surface of the connecting portion 105 are suppressed. Thus, a sufficient amount of contraction of the spring member 140 during the overturning operation can be ensured. As a result, the surplus length ma of the operation wire 98 can be sufficiently absorbed by the connecting portion 105, so that the buckling of the operation wire 98 during the lying down operation can be reliably prevented.

[Modification of resistance application section]
In the connection part 105 of the first embodiment, when the standing operation lever 74 is laid down, the wire end part 98a in the holding hole 136 accompanying the movement of the connection part 105 etc. in the first direction A, etc. Although a resistance force is applied to the movement (movement in the second direction B) by the spring member 140, another resistance application unit is used as shown in the following second to fifth embodiments. Also good. In addition, the resistance provision part of this invention is not limited to the resistance provision part of each embodiment.

  In addition, the endoscope 1 according to the following second to fifth embodiments is basically the same as the endoscope 1 according to the first embodiment except that the endoscope 1 according to the second embodiment includes a resistance applying unit different from the spring member 140. It is the same configuration. For this reason, the same functions or configurations as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

<Connecting Portion of Endoscope of Second Embodiment>
FIG. 13 is a cross-sectional view of the connecting portion 105A of the endoscope 1 according to the second embodiment. As shown in FIG. 13, a cylindrical friction plate 142 (corresponding to the resistance applying portion of the present invention) is provided instead of the spring member 140 on the inner surface of the holding hole 136 of the connecting portion 105A of the second embodiment. ing.

  The friction plate 142 is provided in a portion on the first direction A side on the inner surface of the holding hole 136 and has substantially the same length as the piston 135. The friction plate 142 has a friction surface that is in sliding contact with the outer surface of the piston 135. For this reason, when the connecting portion 105 </ b> A or the like moves in the first direction A due to the overturning operation, the friction plate 142 imparts resistance to the movement of the wire end portion 98 a or the like in the holding hole 136. As a result, when the load F in the first direction A applied from the slider 109 or the like to the connecting portion 105A by the overturning operation becomes less than a certain value, the wire end 98a or the like is frictionally coupled to the friction plate 142, and the wire end 98a and the like move in the first direction A integrally with the connecting portion 105A. As a result, the distance L is kept constant as in the first embodiment.

  When the magnitude of the load F in the first direction A applied from the slider 109 or the like to the connecting portion 105A is equal to or greater than the above-described predetermined value, the wire end 98a or the like is caused to be a frictional force ( It moves in the second direction B against the resistance force. That is, the connecting portion 105A moves in the first direction A relative to the wire end portion 98a and the like. As a result, the distance L is reduced as in the first embodiment, so that the buckling of the operation wire 98 is prevented from occurring when a lying down operation is performed.

  When the standing operation is performed, a load F in the second direction B is applied to the connecting portion 105A from the slider 109 or the like. Further, the restoring force of the treatment tool curved by the stand 60 acts as a force for urging the wire end portion 98a in the first direction A via the stand 60 and the like. For this reason, even if the wire end portion 98a and the like are separated from the movement restricting portion 138 due to the overturning operation, the wire end portion 98a and the like relatively move in the first direction A within the holding hole 136 and move to the movement restricting portion 138. Abut. As a result, when the standing operation is performed, the wire end portion 98a and the like can be drawn in the second direction B integrally with the connecting portion 105A as in the first embodiment, so that a direct operational feeling can be obtained. Can be given to the surgeon.

  The position where the friction plate 142 is provided in the holding hole 136 is not limited to the position shown in the drawing, and can be changed as appropriate. For example, the friction plate 142 may be provided over the entire length of the holding hole 136. Also, the shape of the friction plate 142 is not limited to the cylindrical shape shown in the figure, and may take any shape.

<Connector of Endoscope of Third Embodiment>
FIG. 14 is a cross-sectional view of the connecting portion 105B of the endoscope 1 according to the third embodiment. As shown in FIG. 14, in the holding hole 136 of the connecting portion 105B of the third embodiment, a damper chamber 151 sealed with a gas 150A or a liquid 150B instead of the spring member 140 (corresponding to the resistance applying portion of the present invention). ) Is provided. In this case, an O-ring (not shown) or the like is attached to the outer peripheral surface of the piston 135 in the second direction B side, and the air tightness of the damper chamber 151 is ensured.

  Similarly to the spring member 140 of the first embodiment, the damper chamber 151 applies a biasing force f that biases the wire end portion 98a and the like toward the first direction A (movement restricting portion 138). The same function as the spring member 140 is achieved. Thereby, also in the third embodiment, the buckling of the operation wire 98 is prevented when a lying down operation is performed as in the first embodiment, and the direct operation is performed when the standing operation is performed. A feeling can be given to the surgeon.

<Connecting Portion of Endoscope of Fourth Embodiment>
FIG. 15 is a cross-sectional view of the connecting portion 105C of the endoscope 1 according to the fourth embodiment. As shown in FIG. 15, an annular first magnet 155 is provided on the movement restricting portion 138 at the end portion in the first direction A of the holding hole 136 in the connecting portion 105 </ b> C of the fourth embodiment. Further, an annular second magnet 156 is provided at a position facing the first magnet 155 in the wire end portion 98a and the like (piston 135).

  The second magnet 156 has a magnetic pole different from that of the first magnet 155 and generates an attractive force between the second magnet 156 and the first magnet 155. Similar to the spring member 140 of the first embodiment, this attractive force acts as a biasing force f (see FIG. 7) that biases the wire end portion 98a and the like toward the first direction A (movement restricting portion 138). To do. For this reason, the 1st magnet 155 and the 2nd magnet 156 fulfill | perform the function similar to the spring member 140 of the said 1st Embodiment. Thereby, also in the fourth embodiment, as in the first embodiment, the buckling of the operation wire 98 is prevented when the lying down operation is performed, and the direct operation is performed when the standing operation is performed. A feeling of operation can be given to the surgeon.

  If the attractive force acting as the biasing force f described above can be generated between the end of the holding hole 136 on the first direction A side and the wire end 98a or the like, the first direction A of the holding hole 136 can be generated. The position and shape of the first magnet 155 in the end portion on the side and the position and shape of the second magnet 156 in the wire end portion 98a and the like may be appropriately changed.

<Connecting Portion of Endoscope of Fifth Embodiment>
FIG. 16 is a cross-sectional view of the connecting portion 105D of the endoscope 1 according to the fifth embodiment. As shown in FIG. 16, a disk-shaped first magnet 158 is provided on the bottom 136a at the end of the holding hole 136 in the second direction B side of the connecting portion 105D of the fifth embodiment. In addition, a disk-shaped second magnet 159 is provided at a position facing the first magnet 158 at the wire end portion 98a and the like (piston 135).

  The second magnet 159 has the same magnetic pole as the first magnet 158, and generates a repulsive force with the first magnet 158. Similar to the first embodiment, this repulsive force acts as a biasing force f that biases the wire end portion 98a and the like toward the first direction A (movement restricting portion 138). For this reason, the 1st magnet 158 and the 2nd magnet 159 fulfill | perform the function similar to the spring member 140 of the said 1st Embodiment. Thereby, also in the fifth embodiment, as in the first embodiment, the buckling of the operation wire 98 is prevented when the lying down operation is performed, and the direct operation is performed when the standing operation is performed. A feeling of operation can be given to the surgeon.

  If the repulsive force acting as the aforementioned urging force f can be generated between the end of the holding hole 136 on the second direction B side and the wire end 98a or the like, the second direction B of the holding hole 136 can be generated. The position and shape of the first magnet 158 in the end portion on the side and the position and shape of the second magnet 159 in the wire end portion 98a and the like may be appropriately changed.

[Others]
In each of the embodiments described above, the tilting operation and the standing operation of the stand 60 are performed by the rotation operation of the stand operation lever 74. However, the operation of the stand 60 is performed by various operation members such as a push / pull operation member that performs the push / pull operation. A lodging operation and a standing operation may be performed.

  In each of the above embodiments, various resistance applying members such as the spring member 140 are provided in the holding hole 136, but the resistance applying member may be omitted. Even in this case, since the distance L is reduced according to the load F in the first direction A applied from the slider 109 to the connecting portion 105 and the like by the lying down operation, the surplus length ma of the operating wire 98 is absorbed by the connecting portion 105 and the like. 98 buckling can be prevented. Further, when the standing operation is performed, the wire end 98a and the like move relatively in the first direction A within the holding hole 136 by the restoring force of the treatment tool described above, and come into contact with the movement restricting portion 138. The wire end portion 98a and the like can be pulled in the second direction B integrally with the connection portion 105 and the like.

  In each of the above-described embodiments, the buckling prevention of the operation wire 98 in the case where the lying operation in which the operation wire 98 is further pushed in the first direction A is performed in a state where the upright 60 is in the lying position has been described. It is not limited to. For example, even when a lying down operation is performed in a state where rotation to the lying down position is restricted by abutment of the stand 60 with an inner wall or the like in the body cavity, the operation wire 98 is moved in the first direction A. Since a load against movement is applied, the operation wire 98 is in the aforementioned load state. Also in this case, since the distance L is shortened by the connecting portions 105, 105A to 105D, at least a part of the pushing amount of the operation wire 98 can be absorbed (the pushing amount is reduced), so that the buckling of the operation wire 98 is prevented. Can be prevented.

  In each of the above-described embodiments, an ultrasonic endoscope has been described as an example of the endoscope 1. However, for example, various types having an upright stand 60 such as a duodenoscope (side endoscope), a direct endoscope, and a perspective mirror. The present invention can be applied to an endoscope of this type and a wire push-pull device used for various endoscopes.

DESCRIPTION OF SYMBOLS 1 Endoscope 10 Insertion part 12 Operation part 13 Housing | casing 13D Lower surface 13R Right side surface 13U Upper surface 14 Universal cord 24 Treatment tool inlet 30 Soft part 32 Bending part 34 Tip part 40 Base 41L Left side slope 41R Right side slope 42 Extension part 44 Observation window 46L Illumination window 46R Illumination window 48 Air supply / water supply nozzle 50 Ultrasonic transducer 58 Treatment instrument outlet 60 Standing table 60a Guide surface 62 Treatment instrument standing space 64 Treatment instrument outlet 66 Opening section 70 Left / right bending operation knob 72 Up / down bending operation Knob 74 Standing operation lever 78 Up / down lock lever 80 Air / water supply button 82 Suction button 98 Operation wire 98a Wire end 99 Sheath 100 Standing table drive mechanism 101 Power transmission mechanism in tip portion 102 Base plate 104 Link mechanism 105 Connection portion 105A Connection portion 105B Connection 105C connecting portion 105D connecting portion 107 rotating drum 107a rotating shaft 108 crank member 109 slider 111 guide tube 120 lever accommodating body 122 rotating shaft 124 lever accommodating space portion 126 upright lever 129 tube member 130 mounting member 131 connector 134 connecting member 135 piston 136 holding Hole 136a Bottom portion 138 Movement restricting portion 140 Spring member 142 Friction plate 150A Gas 150B Liquid 151 Damper chamber 155 First magnet 156 Second magnet 158 First magnet 159 Second magnet 203 Operation wire 204 Sheath 204a Inner surface 300 Connection portion 300a Holding hole A First direction B Second direction F Load FL Constant value L Distance LH Maximum value LL Minimum value f Energizing force ma Extra length

Claims (12)

An insertion portion having a distal end and a proximal end, an operation portion connected to the proximal end side of the insertion portion, an operation member provided in the operation portion, and a rotation portion provided on the distal end side of the insertion portion. And an operation wire that is arranged from the distal end of the insertion portion to the operation portion and rotates the stand by being pushed and pulled according to the operation of the operation member. In the wire pulling device provided in the mirror,
A link mechanism connected to the operation member in the operation unit, the link mechanism having a slider that slides in the wire axis direction of the operation wire in response to the operation;
A connecting portion for connecting the slider and a wire end portion of the operation wire in the operation portion, wherein the slider is connected to the slider at one end side in the wire axial direction and the wire is connected to the other end side in the wire axial direction; A connecting part for holding the end part movably in the wire axis direction;
With
The wire axial direction includes a first direction in which the operation wire is pushed into the distal end side of the insertion portion, and a second direction in which the operation wire is drawn into the proximal end side of the insertion portion,
When the connection portion is moved in the first direction via the slider by the operation, the distance between the slider and the wire end portion moves relative to the wire end portion in the first direction. A wire push-pull device that moves the wire end portion integrally in the second direction when the wire end is moved in the second direction.   The wire pushing / pulling device according to claim 1, wherein when the connecting portion is moved in the first direction, the distance is reduced according to a load applied to the connecting portion from the slider.   When the connection portion is moved in the first direction, and the load applied to the connection portion from the slider is less than a predetermined value, the wire end portion is moved integrally in the first direction. The wire pushing / pulling device according to claim 2, wherein when the load is equal to or greater than a certain value, the distance is shortened according to the magnitude of the load. A holding hole formed at an end portion of the connection portion in the first direction and holding the wire end portion movably in the wire axis direction;
A resistance applying portion that is provided in the holding hole and applies resistance to movement of the wire end portion in the holding hole when the connection portion is moved in the first direction;
A wire push-pull device according to any one of claims 1 to 3. A movement restricting portion that is provided at an end portion of the holding hole in the first direction and restricts movement of the wire end portion in the first direction;
The resistance applying unit applies, to the wire end, a biasing force that biases the wire end toward the movement restricting unit as the resistance.
The wire push / pull device according to claim 4, wherein the wire end receives the urging force from the resistance applying unit and abuts on the movement restricting unit when the operation wire is in an unloaded state. A bottom portion is provided at an end of the holding hole in the second direction;
The wire push-pull device according to claim 4 or 5, wherein the resistance applying portion is a spring member provided between the wire end portion and the bottom portion in the holding hole.   The wire push / pull device according to claim 4, wherein the resistance applying portion is a friction plate provided on an inner surface of the holding hole. A bottom portion is provided at an end of the holding hole in the second direction;
The wire push-pull device according to claim 4 or 5, wherein the resistance applying portion is a damper chamber provided between the wire end portion and the bottom portion in the holding hole and sealed with gas or liquid. The resistance applying unit is
A first magnet provided at an end of the holding hole in the first direction;
A second magnet provided at an end of the wire and generating an attractive force with the first magnet;
The wire pushing / pulling device according to claim 4 or 5. The resistance applying unit is
A first magnet provided at an end of the holding hole in the second direction;
A second magnet provided at the end of the wire and generating a repulsive force with the first magnet;
A wire push-pull device according to claim 4 or 5. A movement restricting portion for restricting movement of the wire end portion in the first direction is provided at an end portion of the holding hole in the first direction,
The said movement control part contact | abuts to the said wire end part, and when the said connection part is moved to the said 2nd direction, the said wire end part is integrally moved to the said 2nd direction. The wire push-pull device according to any one of the above. An insertion portion having a distal end and a proximal end;
An operation unit connected to a proximal end side of the insertion unit;
An operation member provided in the operation unit;
A stand that is rotatably provided at the distal end side of the insertion portion;
An operation wire that is arranged from the distal end of the insertion portion to the operation portion, and is rotated according to the operation of the operation member to rotate the stand.
A wire push-pull device according to any one of claims 1 to 11,
An endoscope comprising:

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