CN107440667B - Wire pushing and pulling device and endoscope - Google Patents

Abstract

The invention provides a wire push-pull device and an endoscope, which do not affect the operation feeling and can prevent the buckling of an operation wire caused by the falling operation of a stand. The wire push-pull device of the present invention includes: a link mechanism connected to the operation member in the operation portion and having a slider that slides in a direction of a spool of the operation wire in accordance with an operation; and a connecting portion that connects the slider and a wire end portion of the operating wire in the operating portion, is connected to the slider on one end side in the axial direction, and holds the wire end portion so as to be freely movable in the axial direction on the other end side in the axial direction.

Description

Wire pushing and pulling device and endoscope

Technical Field

The present invention relates to a wire pushing and pulling device that pushes and pulls an operation wire that rotates a standing platform, and an endoscope provided with the wire pushing and pulling device.

Background

In an endoscope, various treatment instruments are introduced from a treatment instrument introduction port of an operation portion, and the treatment instruments are externally led out from a treatment instrument lead-out port opened at a distal end portion of an insertion portion to perform treatment. For example, a treatment instrument such as a lead wire or a contrast tube is used for a duodenoscope (side view endoscope), a treatment instrument such as a puncture needle is used for an ultrasonic endoscope, and a treatment instrument such as a forceps or a snare is used for other staight mirror and an oblique mirror. In order to perform a desired position in a subject, such a treatment instrument needs to change the leading direction at the distal end of the insertion portion. Therefore, an upright stand for changing the lead-out direction of the treatment instrument is rotatably provided at the distal end portion of the insertion portion.

The raising base is directly connected (wire-pulling type) or indirectly connected (lever type) via a lever with an operation wire extending from the distal end of the insertion portion to the operation portion. The operating wire is protected by a sleeve inside the insertion portion, and the operating wire moves forward and backward inside the sleeve. The inside of the sleeve is formed of a close-fitting spring and the outside is formed of a resin hose (or a combination opposite thereto), and has a flexible structure.

The operation section is provided with a raising operation lever (operation member) and a link mechanism coupled to the raising operation lever. The link mechanism has a slider that slides in the spool direction of the operating wire in accordance with the operation of the raising operating lever. The slider is connected with the wire end of the operating wire. Thus, the operation wire is pushed and pulled in the insertion portion via the slider of the link mechanism by the operation of the raising operation lever, and the posture of the raising table can be changed between the falling position and the raising position.

In the endoscope described in patent document 1, a slider of a link mechanism and a wire end portion of an operation wire are coupled via a spring in an operation portion. Accordingly, in the endoscope of patent document 1, when the raising operation is performed to rotate the raising table to the raising position, the spring is extended when the tensile force of the predetermined value or more acts on the operation wire, and therefore, the tensile force of the predetermined value or more can be prevented from acting on the operation wire.

In the endoscope described in patent document 2, a wire connecting 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 connecting portion is connected to a wire end portion of the 1 st operating wire disposed from the distal end of the insertion portion to the operating portion. The 1 st operation wire is covered with a coil spring. On the other hand, the other end portion of the wire connecting portion holds the wire end portion of the 2 nd operation wire wound around a pulley coupled to the bending operation knob in the operation portion so as to be movable in the wire axial direction. By these coil springs and the wire connecting portions, the meandering of the 1 st operation wire and the 2 nd operation wire can be prevented when the rotation operation (bending operation) of the bending operation knob is performed.

In the endoscope described in patent document 3, a wire slack absorption frame that absorbs slack 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 a buffer member that absorbs impact when the wire slack absorption frame collides with a bending stopper in the operation portion is provided in the wire slack absorption frame. Thereby, the operating wire can be prevented from being damaged even when a sharp bending operation is performed.

Patent document 1: japanese patent laid-open publication No. 2003-24579

Patent document 2: japanese patent laid-open publication No. 2009-172028

Patent document 3: japanese patent application laid-open No. 2010-51543

The function required of the operation wire for rotating the raising base is to rotate the raising base to the raising position by pulling the operation wire in the insertion portion and to rotate the raising base to the falling position by pushing the operation wire in. Further, the function required for the sleeve is that it is difficult to expand and contract the tensile force and the press-in force of the operation wire. In this way, the operation wire for rotating the raising base is different from the operation wire for bending operation in terms of the operation wire that needs to be pushed in.

Fig. 17 is an explanatory diagram for explaining a problem of the conventional technique. As shown in fig. 17, when the insertion portion of the endoscope is inserted into the body cavity, the insertion portion is inserted along the digestive tract or the like. Therefore, the insertion portion may be changed from a straight state indicated by reference numeral 200 in the upper stage of fig. 17 to a curved state in which the insertion portion is curved as indicated by reference numeral 201 in the lower stage of fig. 17.

In the bent state 201, when a falling operation for rotating the raising table to a falling position, that is, an operation for pushing the operation wire 203 (indicated by an arrow PS in the figure) is performed, the operation wire 203 is pushed along the inner surface 204a outside the bent portion inside the sleeve 204 without passing through the center of the sleeve 204. Therefore, in the curved state 201, the pushing amount of the operation wire acting on the raising table by the lowering operation of the raising operation lever is shorter than that in the straight state 200. Therefore, even in the bent state 201, in order to reliably rotate the raising base to the falling position (fall), it is necessary to secure a sufficient length of the operation wire and a sufficient pushing amount of the operation wire during the falling operation.

However, when the pushing amount of the operation wire in the bending state 201 is sufficiently secured in the lodging operation, the extra length (margin of space) of the operation wire in the straight state 200 becomes long. The extra length indicates that the raising lever can be further rotated in the same direction in the straight state 200 from the time the raising lever is rotated to the time the raising platform is fully tilted to the tilted position. When the raising operation lever is further rotated in the same direction, the operation wire is in a state of being deflected in the sleeve or the like. Therefore, if the extra length is increased, the operation wire is buckled. As a result, the operation line may be deteriorated.

In the endoscope described in patent document 1, the slider of the link mechanism and the wire end portion of the operation wire are connected by a spring, but the object is to prevent the breakage of the operation wire when the operation wire is pulled with an excessive force at the time of the raising operation of the raising table, and therefore buckling of the operation wire at the time of the falling operation cannot be prevented. Further, when the stand is fully erected to the erected position, the tensile force (traction force) of the operation wire is required to be strong, and therefore, the effect of preventing the breakage of the operation wire is deteriorated when a strong spring is used, and the operation feeling is deteriorated when a soft spring is used in contrast. Then, a time lag due to the expansion of the spring is generated between the raising operation (the pulling operation of the operation wire) by the raising operation lever and the raising of the raising table by the pulling operation. As a result, the operation 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 for the purpose of preventing buckling of the operation wire. Further, if the invention described in patent document 2 is applied to the raising table driving mechanism of the raising table, the operation wire needs to be covered with the coil spring, and therefore the diameter of the insertion portion is increased. In recent years, the diameter of the insertion portion is required to be further reduced, and therefore the method described in patent document 2 cannot be used.

In the above patent document 3, the object is to prevent the wire from being damaged during the bending operation (pulling operation) of the insertion portion, but not to prevent the buckling of the wire. Further, even if the invention described in patent document 3 is applied to the raising table driving mechanism of the raising table, buckling of the operation wire cannot be prevented.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a wire pushing and pulling device capable of preventing buckling of an operation wire caused by a falling operation of a rising base without affecting an operation feeling, and an endoscope including the wire pushing and pulling device.

A wire push-pull device for achieving the object of the present invention is provided in an endoscope, the endoscope including: an insertion portion having a leading end and a base end; an operation part connected to the proximal end side of the insertion part; an operation member provided in the operation section; a stand rotatably provided on a distal end side of the insertion portion; and an operation wire which is arranged from the front end of the insertion portion to the operation portion and rotates the standing platform by being pushed and pulled according to the operation of the operation member, wherein the wire pushing and pulling device comprises: a link mechanism connected to the operation member in the operation portion and having a slider that slides in a direction of a spool of the operation wire in accordance with an operation; and a connecting portion which connects the slider and a wire end portion of the operating wire in the operating portion, is connected to the slider on one end side in the axial direction, and holds the wire end portion on the other end side in the axial direction so as to be movable in the axial direction, the axial direction includes a 1 st direction in which the operating wire is pressed into a tip end side of the insertion portion and a 2 nd direction in which the operating wire is pulled toward a base end side of the insertion portion, and when the connecting portion is moved in the 1 st direction by an operation via the slider, the connecting portion is moved relative to the wire end portion in the 1 st direction to shorten a distance between the slider and the wire end portion, and when the connecting portion is moved in the 2 nd direction, the wire end portion is moved integrally.

According to this wire pushing and pulling device, when the operation wire is pushed into the distal end side of the insertion portion, the distance between the slider and the wire end portion is shortened, whereby a part (excess length) of the pushing amount of the operation wire can be absorbed by the connection portion, and buckling of the operation wire can be prevented. Further, when the manipulation wire is pulled to the proximal end side of the insertion portion, the wire end portion can be pulled integrally with the connection portion in the 2 nd direction, and thus a direct manipulation feeling can be given to the operator.

In the wire pushing and pulling device according to another aspect of the present invention, when the connecting portion moves in the 1 st direction, the distance is shortened according to the magnitude of the load applied to the connecting portion from the slider. This allows the connecting portion to absorb a part (excess length) of the pushing amount of the wire, thereby preventing buckling of the wire.

In the wire pushing and pulling device according to another aspect of the present invention, when the connecting portion moves in the 1 st direction and the load applied to the connecting portion from the slider is smaller than a predetermined value, the wire end portion is integrally moved in the 1 st direction, and when the load is equal to or larger than the predetermined value, the distance is shortened according to the magnitude of the load. This allows the connecting portion to absorb a part (excess length) of the pushing amount of the wire, thereby preventing buckling of the wire.

A wire pushing and pulling device according to another aspect of the present invention includes: a holding hole formed at an end of the connecting portion in the 1 st direction and holding a wire end portion so as to be movable in a linear axis direction; and a resistance applying portion disposed in the holding hole, for applying resistance to the movement of the wire end portion in the holding hole when the connecting portion moves in the 1 st direction. Thus, when a load is applied to the connection portion against the resistance by the resistance applying portion, the distance between the slider and the wire end portion can be shortened, and buckling of the operation wire can be prevented.

In a wire pushing and pulling device according to another aspect of the present invention, the wire pushing and pulling device includes a movement restricting portion that is provided at an end portion of the holding hole in the 1 st direction and restricts movement of the wire end portion in the 1 st direction, the resistance applying portion applies, as a resistance, a biasing force to the wire end portion toward the movement restricting portion, and when the operation wire is in a no-load state, the wire end portion receives the biasing force from the resistance applying portion and abuts against the movement restricting portion. Thus, when the manipulation wire is pulled to the proximal end side of the insertion portion, the wire end portion can be pulled integrally with the connection portion in the 2 nd direction, and thus a direct manipulation feeling can be given to the operator.

In a wire pushing and pulling device according to another aspect of the present invention, a bottom portion is provided at an end portion of the holding hole in the 2 nd direction, and the resistance applying portion is a spring member provided between the end portion and the bottom portion of the wire in the holding hole. Thus, when a load is applied to the connection portion against the resistance by the resistance applying portion, the distance between the slider and the wire end portion can be shortened, and buckling of the operation wire can be prevented.

In the wire pushing and pulling device according to another aspect of the present invention, the resistance applying portion is a friction plate provided on an inner surface of the holding hole. Thus, when a load is applied to the connection portion against the resistance by the resistance applying portion, the distance between the slider and the wire end portion can be shortened, and buckling of the operation wire can be prevented.

In a wire pushing and pulling device according to another aspect of the present invention, a bottom portion is provided at an end portion of the holding hole in the 2 nd direction, and the resistance applying portion is a damping chamber that is provided between the end portion of the wire and the bottom portion in the holding hole and seals the gas or liquid. Thus, when a load is applied to the connection portion against the resistance by the resistance applying portion, the distance between the slider and the wire end portion can be shortened, and buckling of the operation wire can be prevented.

In a wire pushing and pulling device according to another aspect of the present invention, the resistance applying section includes: a 1 st magnet disposed at an end of the holding hole in a 1 st direction; and a 2 nd magnet disposed at the end of the wire and generating an attractive force with the 1 st magnet. Thus, when a load is applied to the connection portion against the resistance by the resistance applying portion, the distance between the slider and the wire end portion can be shortened, and buckling of the operation wire can be prevented.

In a wire pushing and pulling device according to another aspect of the present invention, a resistance applying unit includes: a 1 st magnet disposed at an end of the holding hole in a 2 nd direction; and a 2 nd magnet disposed at the end of the wire and generating a repulsive force with the 1 st magnet. Thus, when a load is applied to the connection portion against the resistance by the resistance applying portion, the distance between the slider and the wire end portion can be shortened, and buckling of the operation wire can be prevented.

In a wire pushing and pulling device according to another aspect of the present invention, a movement restricting portion that restricts movement of a wire end portion in a 1 st direction is provided at an end portion of the holding hole in the 1 st direction, and when the connecting portion moves in a 2 nd direction, the movement restricting portion abuts against the wire end portion and moves the wire end portion integrally in the 2 nd direction. This enables the operator to feel a direct operation feeling.

An endoscope for achieving the object of the present invention includes: an insertion portion having a leading end and a base end; an operation part connected to the proximal end side of the insertion part; an operation member provided in the operation section; a stand rotatably provided on a distal end side of the insertion portion; an operation wire which is arranged from the front end of the insertion part to the operation part and pushes and pulls according to the operation of the operation component, thereby rotating the standing platform; and the wire push-pull device.

Effects of the invention

The invention provides a wire push-pull device and an endoscope, which do not affect the operation feeling and can prevent the buckling of an operation wire caused by the falling operation of a stand.

Drawings

Fig. 1 is an overall view of an ultrasonic endoscope (endoscope) to which an embodiment of the endoscope of the present invention is applied.

Fig. 2 is an enlarged perspective view of the distal end portion of the insertion portion.

Fig. 3 is an enlarged view of the operation portion.

Fig. 4 is a schematic diagram showing a simplified structure of the raising table driving mechanism in the operation unit.

Fig. 5 is a structural diagram showing an example of the front-end-portion-inner power transmission mechanism in fig. 4.

Fig. 6 is a sectional view of the connection part shown in fig. 4.

Fig. 7 is an enlarged view of the connection portion shown in fig. 6.

Fig. 8 is an explanatory diagram for explaining a state in which the connecting portion is pushed in the 1 st direction a from the position shown in fig. 6 at the time of the lodging operation.

Fig. 9 is an explanatory diagram for explaining a state in which the connection portion is pushed further in the 1 st direction a than the position shown in fig. 8 in the lodging operation.

Fig. 10 is a graph showing an example of the relationship between the load F and the distance L.

Fig. 11 is an explanatory diagram for explaining an operation of the connecting portion when the raising operation is performed.

Fig. 12 is a schematic view of a connecting portion of a comparative example, which is connected to a wire end portion of an operation wire in the 1 st direction a and holds a slider so as to be movable in the wire axial direction in the 2 nd direction B.

Fig. 13 is a sectional view showing the connection of the endoscope of embodiment 2.

Fig. 14 is a sectional view of a connecting portion of an endoscope of embodiment 3.

Fig. 15 is a sectional view of a connecting portion of an endoscope according to embodiment 4.

Fig. 16 is a sectional view of a connecting portion of an endoscope of embodiment 5.

Fig. 17 is an explanatory diagram for explaining a problem of the conventional technique.

Description of the symbols

1-endoscope, 10-insertion section, 12-operation section, 13-frame, 13D-lower surface, 13R-right side surface, 13U-upper surface, 14-universal cord, 24-treatment instrument introduction port, 30-soft section, 32-bending section, 34-tip section, 40-base section, 41L-left side inclined surface, 41R-right side inclined surface, 42-extension section, 44-observation window, 46L-illumination window, 46R-illumination window, 48-air/water supply nozzle, 50-ultrasonic transducer, 58-treatment instrument lead-out section, 60-stand, 60 a-guide surface, 62-treatment instrument stand space, 64-treatment instrument lead-out port, 66-opening section, 70-left/right bending operation knob, 72-up-down bending operation knob, 74-raising operation lever, 78-up-down lock lever, 80-air-feeding-water button, 82-suction button, 98-operation wire, 98 a-wire end portion, 99-bushing, 100-raising-stage driving mechanism, 101-front-end-portion internal power transmission mechanism, 102-base plate, 104-link mechanism, 105-connecting portion, 105A-connecting portion, 105B-connecting portion, 105C-connecting portion, 105D-connecting portion, 107-rotating cylinder, 107 a-rotating shaft, 108-crank member, 109-slider, 111-guide tube, 120-rod accommodating body, 122-rotating shaft, 124-rod accommodating space portion, 126-raising lever, 129-pipe member, 130-mounting member, 131-connector, 134-coupling member, 135-piston, 136-holding hole, 136 a-bottom, 138-movement limiting portion, 140-spring member, 142-friction plate, 150A-gas, 150B-liquid, 151-damping chamber, 155-1 st magnet, 156-2 nd magnet, 158-1 st magnet, 159-2 nd magnet, 203-operating line, 204-sleeve, 204 a-inner surface, 300-connection portion, 300A-holding hole, a-1 st direction, B-2 nd direction, F-load, FL-constant value, L-distance, LH-maximum value, LL-minimum value, F-acting force, ma-excess length.

Detailed Description

[ Structure of ultrasonic endoscope in embodiment 1 ]

Fig. 1 is an overall view of an ultrasonic endoscope (hereinafter, simply referred to as an endoscope) 1 to which an embodiment of the endoscope of the present invention is applied. As shown in fig. 1, an endoscope 1 includes: an insertion unit 10 inserted into a subject (body cavity); an operation unit 12 connected to the proximal end side of the insertion unit 10 and grasped by an operator to perform various operations; and a universal cord 14 connected to the operation unit 12.

The insertion portion 10 is formed to have a small diameter and a long shape as a whole. The insertion portion 10 is configured by connecting a flexible portion 30 having flexibility, a bending portion 32 which can be bent by the operation of the operation portion 12, and a distal end portion 34 on which an imaging device (not shown) and an ultrasonic transducer 50 (refer to fig. 2) are arranged in this order from the proximal end side to the distal end side.

The operation unit 12 is provided with various operation members operated by an operator. Specifically, the operation unit 12 is provided with a left-right bending operation knob 70 and a vertical bending operation knob 72 as bending operation knobs, an erecting operation lever 74 corresponding to operation members of the present invention, an air/water feeding button 80, and a suction button 82.

The operation unit 12 is provided with a treatment instrument introduction port 24 for inserting a treatment instrument into a treatment instrument insertion path (treatment instrument insertion path) which passes through the insertion unit 10.

The universal cord 14 is a connection cord for connecting a system configuration device, which constitutes an endoscope system and includes a processor device, a light source device, and the like, not shown, to the endoscope 1. The universal cord 14 internally encloses a cable, a light pipe, and a fluid hose. A connector is provided at an end of the universal cord 14, which is not shown.

The power, control signals, illumination light, liquid, and gas required for the operation of the endoscope 1 are supplied from the system configuration device to the endoscope 1 by connecting the connector of the universal cord 14 to the system configuration device. Then, data of the observation image acquired by the imaging device of the distal end portion 34 and data of the ultrasonic image acquired by the ultrasonic transducer 50 (refer to fig. 2) of the distal end portion 34 are transmitted from the endoscope 1 to the system configuration device. The observation image and the ultrasonic image transmitted to the system configuration device are displayed on a display.

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 base end side and an extension portion 42 extending from the base portion 40 toward the distal end side.

The extension portion 42 is provided with a convex ultrasonic transducer 50 in which a plurality of ultrasonic transducers for transmitting and receiving ultrasonic waves are arranged along an arc-shaped ultrasonic transmission and reception surface. Thereby, an ultrasonic image (tomographic image) on the scanning plane parallel to the axis of the insertion portion 10 can be acquired by the ultrasonic transducer 50. The data of the ultrasonic image is transmitted to the system component device via a signal cable inserted through the insertion portion 10, the operation portion 12, and the universal cord 14.

The base 40 has a left inclined surface 41L and a right inclined surface 41R formed thereon and directed obliquely upward toward the distal end. The left inclined surface 41L is provided with an observation window 44, an air/water feeding nozzle 48, and an illumination window 46L. Further, the right inclined surface 41R is provided with an illumination window 46R. A treatment instrument lead-out portion 58 is provided between the left inclined surface 41L and the right inclined surface 41R.

An imaging device, in which an imaging optical system and a solid-state imaging element are integrally mounted, is disposed inside the base portion 40 that is the rear side of the observation window 44. This makes it possible to acquire captured image data of a region to be observed located within the field of view of the imaging device. The captured image data is transmitted to a system configuration device connected to the universal cord 14 via the signal cable.

The light emitting portion is disposed inside the base portion 40 which is the inner side of each of the illumination windows 46R and 46L. The light emitting portion introduces illumination light from the system configuration device through a light guide inserted through the insertion portion 10, the operation portion 12, and the inside of the universal cord 14. Thereby, the illumination light emitted from the light emitting portion is irradiated to the site to be observed through the illumination window 46R and the illumination window 46L.

The air/water feeding nozzle 48 is connected to the system component via a fluid hose inserted through the insertion portion 10, the operation portion 12, and the universal cord 14. Thus, the gas or water supplied from the system configuration device is ejected from the air/water supply nozzle 48 toward the observation window 44 to clean the observation window 44.

The treatment instrument lead-out portion 58 has a concave treatment instrument standing space 62, and a treatment instrument lead-out port 64 is disposed on the proximal end side of the treatment instrument standing space 62.

The treatment instrument outlet port 64 communicates with the treatment instrument inlet port 24 (see fig. 1) of the operation unit 12 via a treatment instrument insertion passage (treatment instrument insertion passage) inserted into the insertion unit 10. Thus, the treatment instrument inserted from the treatment instrument introduction port 24 is guided out from the treatment instrument guide-out port 64 to the treatment instrument standing space 62.

Further, a treatment instrument raising table (hereinafter, simply referred to as "raising table") 60 is rotatably provided in the treatment instrument raising space 62 on the distal end side of the treatment instrument outlet 64.

A concave guide surface 60a that is curved upward from the base end side toward the front end side is formed on the upper surface side of the rising table 60. The treatment instrument led out from the treatment instrument outlet 64 is curved upward by being brought into contact with the guide surface 60a of the rising base 60. Thus, the treatment instrument led out from the opening 66 of the treatment instrument standing space 62 is changed in the lead-out direction by the standing table 60, and projects in an upward inclined direction.

Fig. 3 is an enlarged view of the operation portion 12. As shown in fig. 3, the operation unit 12 is surrounded by a housing 13 as an operation unit main body defining the inside and the outside thereof. A right side surface 13R of the operation portion 12 formed by the housing 13 is provided with a left-right bending operation knob 70, a vertical bending operation knob 72, a vertical operation lever 74, a left-right lock knob 76, and a vertical lock lever 78.

The left/right bending operation knob 70, the up/down bending operation knob 72, the raising operation lever 74, the left/right lock knob 76, and the up/down lock lever 78 of the operation portion 12 are provided rotatably about axes substantially orthogonal to the right side surface 13R. 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 rotationally operated, the rotational positions of the left/right bending operation knob 70 and the up/down bending operation knob 72 are locked or unlocked.

When the raising operation lever 74 is rotated, the raising base 60 is moved (rotated) in a raising direction or a falling direction, as described in detail later, and the angular position (raising angle) of the raising base 60 is changed. Thereby, the lead-out direction (lead-out angle) of the treatment instrument led out from the treatment instrument lead-out portion 58 of the distal end portion 34 is changed.

Further, an air/water feeding button 80, a suction button 82, and the like are provided on the upper surface 13U of the operation portion 12. By operating the air/water feeding button 80, the injection of gas or water from the air/water feeding nozzle 48 is turned on or off. By operating the suction button 82, suction from the treatment instrument lead-out portion 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 portion 12.

Next, an explanation will be given of an upright table driving mechanism 100 for causing the upright table 60 of the tip end portion 34 to be upright or laid down by a rotational operation of the upright operation lever 74 of the operation portion 12, with reference to fig. 4. Fig. 4 is a schematic diagram showing a simplified configuration of the raising table driving mechanism 100 in the operation unit 12. The raising table driving mechanism 100 corresponds to the wire pushing and pulling device of the present invention.

As shown in fig. 4, a substrate 102 parallel to the right side surface 13R shown in fig. 3 is provided in the operation portion 12, and an upright table driving mechanism 100 is provided on the substrate 102. The raising table driving mechanism 100 pushes and pulls the operation wire 98 disposed from the distal end of the insertion portion 10 to the operation portion 12 in accordance with the rotation operation of the raising operation lever 74, thereby collapsing or raising the raising table 60. The raising table drive mechanism 100 includes a link mechanism 104 and a connecting portion 105.

The link mechanism 104 includes a drum 107, a crank member 108, and a slider 109. The bowl 107 is provided on the substrate 102 and is rotatably held within a predetermined angular range by a rotating shaft 107a perpendicular to the substrate 102 (right side surface 13R). The drum 107 is provided with the raising lever 74. One end side of a crank member 108 is rotatably connected to the drum 107.

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

The connection portion 105 is supported by the guide tube 111 so as to be slidable in the axial direction. The connection portion 105 connects the slider 109 and a wire end portion 98a (see fig. 6) on the base end side of the operation wire 98 in the operation portion 12, which will be described in detail later. Thereby, the slider 109 and the connecting portion 105 are slid in the axial direction by the rotating operation of the raising operation lever 74. The bobbin direction includes a 1 st direction a in which the operation wire 98 is pushed toward the distal end side of the insertion portion 10 and a 2 nd direction B in which the operation wire 98 is pulled toward the proximal end side of the insertion portion 10.

The operation wire 98 extends from the inside of the operation portion 12 to the inside of the insertion portion 10 and is inserted and disposed to the distal end portion 34. The operation wire 98 is disposed inside the insertion portion 10 so as to be inserted into the sleeve 99 so as to be movable forward and backward. As described above, the sleeve 99 is formed of a close-fitting spring on the inside and a resin hose on the outside (or may be a combination of the opposite), and has a flexible structure.

In the front end portion 34, the front end of the operating wire 98 is connected to the raising table 60 via a raising rod 126 of the front end portion internal power transmission mechanism 101, which will be described later, and the like. The base end side of the stand 60 is rotatably supported with respect to the distal end portion 34. Accordingly, when the slider 109 and the connecting portion 105 are moved in the 1 st direction a, the standing base 60 rotates about the base end side (a rotation shaft 122 described later) to the collapsed position when the operation wire 98 is pushed into the distal end side of the insertion portion 10. When the slider 109 and the connecting portion 105 move in the 2 nd direction B, the raising table 60 rotates about the base end side to the raised position when the operation wire 98 is pulled to the base end side of the insertion portion 10.

Fig. 5 is a structural diagram showing an example of the distal-end-portion internal power transmission mechanism 101 in fig. 4. As shown in fig. 5, one of the pair of wall portions of the treatment instrument standing space 62 forming the treatment instrument lead-out portion 58 shown in fig. 2 is formed as a rod housing 120 at the distal end portion 34.

The rod housing 120 is rotatably supported by a rotary shaft 122 provided so as to penetrate the rod housing 120. One end of the rotary shaft 122 projects into the treatment instrument standing space 62, and the other end projects into a rod accommodating space 124 formed in the rod accommodating body 120.

An end portion on the base end side of the raising base 60 is fixed to one end side of the rotary shaft 122 (see fig. 4). On the other hand, an end portion of the rising bar 126 on the base end side is fixedly accommodated and arranged in the bar accommodating space portion 124 on the other end side of the rotating shaft 122. The end of the raising rod 126 on the distal end side is rotatably connected to the distal end of the operation wire 98 via a connecting pin that is rotatable with respect to the raising rod 126.

When the operation wire 98 is moved forward and backward in the 1 st direction a or the 2 nd direction B by the rotational operation of the raising operation lever 74, the raising lever 126 rotates around the rotation shaft 122 integrally with the rotation shaft 122. The rotation of the rotating shaft 122 causes the stand 60 to rotate around the rotating shaft 122 between a collapsed position (indicated by a solid line) and a raised position (indicated by a two-dot chain line). Hereinafter, the rotation operation of the raising lever 74 for rotating the raising base 60 to the lowered position is referred to as a lowering operation, and the rotation operation of the raising lever 74 for rotating the raising base 60 to the raised position is referred to as a raising operation.

As described with reference to fig. 17, when the insertion section 10 is in the bent state, the amount of pushing of the operation wire 98 that acts on the stand 60 by the tilting operation of the raising operation lever 74 is reduced. Therefore, when the length of the wire 98 is sufficiently secured to allow the insertion portion 10 to be in the bent state, the amount of pushing the wire 98 in the lodging operation can be sufficiently secured. The rotation angle range of the raising operation lever 74 is set to be larger than the operation range (rotation angle range) of the raising table 60.

The distal end of the sleeve 99 through which the operation wire 98 is inserted is fixed to the proximal end side of the rod accommodating body 120. The tube member 129 in the figure is a member forming a treatment instrument insertion passage, and is connected to the treatment instrument introduction port 24 so as to communicate with the treatment instrument introduction port 24.

The distal-end-portion internal power transmission mechanism 101 is not limited to the configuration shown in fig. 5, and may have any configuration. For example, the front end of the operation wire 98 may be directly connected to the raising table 60 (wire-pulling type), or the front end of the operation wire 98 may be indirectly connected to the raising table 60 by a method different from that of the present embodiment.

Further, since this technique is a known technique, a detailed description of a bending portion driving mechanism for bending the bending portion 32 in the up-down direction and the left-right direction by the rotational operation of the left-right bending operation knob 70 and the up-down bending operation knob 72 is omitted.

< Structure of connecting part >

Fig. 6 is a sectional view of the connection portion 105 shown in fig. 4. Fig. 7 is an enlarged view of the connection portion 105 shown in fig. 6. As shown in fig. 6 and 7, the guide tube 111 supporting the connection portion 105 has a cylindrical shape extending in the axial direction (the 1 st direction a and the 2 nd direction B), and is fixed to the substrate 102 via the mounting member 130 (see fig. 4). A connector 131 is attached to an opening of the guide tube 111 in the 1 st direction a. The proximal end portion of the sleeve 99 (sheath) is supported by the connector 131 in a state of being inserted through the connector 131. Thereby, 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 the connecting portion 105 is inserted into the guide tube 111 so as to be slidable. That is, the connection portion 105 is supported by the guide pipe 111 so as to be slidable in the linear axis direction (the 1 st direction a and the 2 nd direction B).

The slider 109 is coupled to an end portion of the connecting portion 105 on the 2 nd direction B side (one end side in the axial direction of the present invention) via a coupling member 134. Further, the connection portion 105 and the slider 109 may be directly connected without the connection member 134. The end portion of the connecting portion 105 on the 1 st direction a side (the other end side in the axial direction of the present invention) holds the wire end portion 98a on the base end side of the operating wire 98 so as to be movable in the axial direction. A substantially cylindrical piston 135 extending in the axial direction is fixed to the thread end portion 98 a. For example, the piston 135 is soldered and fixed to the wire end portion 98a by flowing solder (not shown) into a hole portion formed in the piston 135.

A holding hole 136 (which means a hollow structure defined by an inner wall portion of a cylinder-shaped member constituted by the connecting portion 105, the movement restricting portion 138, and the like) for holding the wire end portion 98a so as to be movable in the linear axis direction is formed in an end portion of the connecting portion 105 on the 1 st direction a side. The inner diameter of the holding hole 136 is formed in a size corresponding to the outer diameter of the piston 135. Thereby, the piston 135 and the thread end portion 98a (hereinafter, simply referred to as the thread end portion 98a and the like) are held movably in the axial direction through the holding hole 136.

At the end of the holding hole 136 on the 1 st direction a side, a substantially annular movement restricting portion 138 having an insertion hole through which the operation wire 98 can be inserted is provided so as to close the opening portion of the holding hole 136 on the 1 st direction a side. The movement restricting portion 138 restricts the movement of the wire end portion 98a and the like in the 1 st direction a. When the slider 109 and the connecting portion 105 move in the 2 nd direction B in response to the raising operation of the raising operation lever 74, the movement restricting portion 138 abuts against the string end portion 98a and the like to integrally move the string end portion 98a and the like in the 2 nd direction B.

A bottom 136a is formed at the end of the holding hole 136 on the 2 nd direction B side. Further, a spring member 140 such as a compression coil spring is provided in the holding hole 136 between the wire end portion 98a and the bottom portion 136 a.

The spring member 140 applies a biasing force f (refer to fig. 7) to the wire end portion 98a and the like, which is applied to the 1 st direction a side (i.e., to the movement restricting portion 138). Thus, when the operation wire 98 is in a no-load state (i.e., a no-load state described later), the wire end portion 98a and the like receive the urging force f from the spring member 140 and come into contact with the movement restricting portion 138. Here, the loaded state of the operation wire 98 refers to, for example, a state in which the operation wire 98 is further pushed in the 1 st direction a in a state in which the standing stand 60 is located at the falling position, and a load resisting movement in the 1 st direction a is applied to the operation wire 98.

Here, when the slider 109 and the connecting portion 105 move in the 1 st direction a in response to the falling operation of the raising operation lever 74, the biasing force f of the spring member 140 acts as a resistance against the movement (movement in the 2 nd direction B) of the wire end portion 98a and the like in the holding hole 136. Therefore, the spring member 140 functions as a resistance applying portion of the present invention.

The spring member 140 does not contract when a load in the 1 st direction a larger than the above-described resistance force is not applied, but keeps a distance L (refer to fig. 6) between the slider 109 and the wire end 98a or the like constant. Specifically, when the operation wire 98 is in the no-load state, the load in the 1 st direction a applied to the spring member 140 is reduced, and the spring member 140 does not contract and the distance L is kept constant.

On the other hand, when a load in the 1 st direction a larger than the resistance is applied, the spring member 140 contracts in accordance with the magnitude of the load, and the distance L is shortened. As described above, in the present embodiment, the length of the operation wire 98 is adjusted so that the insertion portion 10 is in the bent state, and the amount of pushing the operation wire 98 in the lodging operation is sufficiently secured. Therefore, when the insertion portion 10 is in the straight state, the operation wire 98 can be pushed in by the extra length (also referred to as a margin of space) of the operation wire 98 by performing the lowering operation from the state rotated to the lowering position by the raising base 60. Accordingly, since the operation wire 98 is in a loaded state, the load in the 1 st direction a applied to the spring member 140 becomes large, and the spring member 140 contracts and the distance L also becomes short.

< action of connection part in lodging operation >

Next, the operation (action) of the raising table driving mechanism 100, particularly the connecting portion 105, during the lowering operation will be described with reference to fig. 8 and 9. Fig. 8 is an explanatory diagram for explaining a state in which the connecting portion 105 is pushed in the 1 st direction a further than the position shown in fig. 6 at the time of the lodging operation. Fig. 9 is an explanatory diagram for explaining a state in which the connection portion 105 is pushed further in the 1 st direction a than the position shown in fig. 8 at the time of the lodging operation.

When the operator starts the operation of lowering the operation lever 74, the slider 109 moves in the 1 st direction a via the drum 107 and the crank member 108, and a load F in the 1 st direction a is applied from the slider 109 to the connecting portion 105 via the connecting member 134. Thereby, as shown in fig. 8, the connection portion 105 moves in the 1 st direction a in the guide pipe 111.

At this time, when the magnitude of the load F in the 1 st direction a applied from the slider 109 to the connecting portion 105, that is, the magnitude of the force to relatively move the wire end 98a and the like in the 2 nd direction B in the holding hole 136 is smaller than a constant value corresponding to the urging force F (resistance force) of the spring member 140, the spring member 140 does not contract and the distance L is kept constant. Thereby, the connection portion 105 moves integrally with the wire end portion 98a and the like in the 1 st direction a, and the operation wire 98 is pushed in the 1 st direction a in the insertion portion 10. As a result, the raising table 60 is rotated to the collapsed position by the front end portion internal power transmission mechanism 101 shown in fig. 5.

In this embodiment, the length of the operation wire 98 is sufficiently ensured, and the rotation angle range of the raising operation lever 74 is set to be larger than the operation range of the raising table 60 so that the pushing amount of the operation wire 98 can be sufficiently ensured even when the insertion portion 10 is in the bent state. Therefore, when the raising table 60 is lowered to the lowering position and the raising operation lever 74 is also lowered, the operation wire 98 is pressed in the 1 st direction a, and the operation wire 98 is in a loaded state. Thereby, the load F in the 1 st direction a applied from the slider 109 or the like to the connection portion 105 is increased by the lodging operation.

As shown in fig. 9, when the magnitude of the load F in the 1 st direction a applied from the slider 109 or the like to the connecting portion 105 is equal to or greater than the predetermined value, the wire end portion 98a or the like moves in the 2 nd direction B in the holding hole 136 against the urging force of the spring member 140. That is, the connection portion 105 moves relative to the wire end portion 98a and the like in the 1 st direction a. Thereby, the spring member 140 contracts according to the magnitude of the load F, and the distance L is shortened accordingly. As a result, a part of the pushing amount of the operation wire 98 by the operation of lowering the raising operation lever 74 is absorbed by the connecting portion 105, and the amount of the pushing amount absorbed by the connecting portion 105 can be reduced.

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 connection portion 105 (the spring member 140) is smaller than the predetermined value FL, that is, when the operation wire 98 is in the no-load state, the spring member 140 does not contract, and therefore the distance L is kept constant at the maximum value LH.

Next, when the magnitude of the load F in the 1 st direction a applied to the connection portion 105 (spring member 140) becomes equal to or greater than the predetermined value FL, that is, when the operation wire 98 is in the loaded state, the spring member 140 contracts in accordance with the magnitude of the load F, and then contracts from the maximum value LH with the distance L. When the magnitude of the load F increases to a value FH and the length of the spring member 140 becomes minimum, the distance L also becomes minimum LL.

Thus, the connection portion 105 can be shortened by a distance L corresponding to the maximum Δ L (Δ L — LH) at the time of the lodging operation. Therefore, if the extra length ma of the operation wire 98 when the insertion portion 10 is in the straight state is smaller than Δ L (ma < Δ L), at least the pushing amount of the operation wire 98 corresponding to the extra length ma can be absorbed by the connection portion 105. As a result, the operation wire 98 is prevented from being further pushed in the 1 st direction a in the insertion portion 10 in a state where the standing stand 60 reaches the falling position.

When the spring constant of the spring member 140 is small, the spring member 140 contracts while (substantially simultaneously) the load F in the 1 st direction a is applied from the slider 109 or the like to the connecting portion 105 (the spring member 140), and the distance L is reduced from the maximum value LH in accordance with the magnitude of the load F.

< action of connecting part at the time of erecting operation >

Fig. 11 is an explanatory diagram for explaining an operation of the connecting portion 105 in the raising operation. When the operator starts the raising operation of the raising operation lever 74, as shown in fig. 11, a load F in the 2 nd direction B is applied from the slider 109 to the connecting portion 105 via the connecting member 134. At this time, the thread end portion 98a and the like receive the urging force f from the spring member 140 and the restoring force of the treatment instrument bent by the raising table 60, and the restoring force applied to the thread end portion 98a and the like in the 1 st direction a via the raising table 60 and the like, and come into contact with the movement restricting portion 138. Therefore, when the connecting portion 105 is moved in the 2 nd direction B by the slider 109 or the like, the movement restricting portion 138 moves the string end portion 98a or the like integrally in the 2 nd direction B in a state of being in contact with the string end portion 98a or the like as indicated by an arrow PL in the drawing. Thereby, the operation wire 98 is pulled in the 2 nd direction B in the insertion portion 10. As a result, the raising table 60 is rotated to the raising position by the power transmission mechanism 101 in the front end portion.

In the raising operation, since the wire end portion 98a is pulled in the 2 nd direction B in a state where the movement restricting portion 138 of the connecting portion 105 is brought into contact with the wire end portion 98a or the like, the operation wire 98 can be pulled in the 2 nd direction B while keeping the distance L constant, unlike the case of performing the above-described lowering operation, regardless of the magnitude of the load F. Therefore, the amount of rotation of the raising operation lever 74 caused by the raising operation can be matched with the amount of pulling of the operation wire 98 (the amount of rotation of the raising table 60).

[ Effect of embodiment 1 ]

As described above, in the endoscope 1 according to embodiment 1, when the operation of collapsing is performed, a part of the pushing amount (excess length ma) of the operation wire 98 can be absorbed by the connecting portion 105. As a result, the operation wire 98 is prevented from being pushed further in the 1 st direction a in a state where the rising base 60 reaches the falling position, and therefore buckling of the operation wire 98 can be prevented. Further, since the connecting portion 105, the wire end portion 98a, and the like can be integrally pulled in the 2 nd direction B during the raising operation, the operator can be given a direct feeling of operation by matching the amount of rotation of the raising operation lever 74 with the amount of pulling of the operation wire 98. This prevents buckling of the operation wire 98 when the raising table 60 is tilted down without affecting the operational feeling.

Further, the connecting portion 105 of embodiment 1 is coupled to the slider 109 via the coupling member 134 or the like at the end portion on the 2 nd direction B side, and holds the wire end portion 98a of the operating wire 98 having a diameter smaller than that of the slider 109 so as to be movable in the linear axial direction at the end portion on the 1 st direction a side, so that the connecting portion 105 can be downsized.

On the other hand, fig. 12 is a schematic view of a connecting portion 300 of a comparative example, which is connected to a wire end portion 98a of the operating wire 98 on the 1 st direction a side and holds the slider 109 (which may be the connecting member 134) so as to be movable in the wire axial direction on the 2 nd direction B side. As shown in fig. 12, in the connection portion 300 of the comparative example, it is necessary to provide a holding hole 300a for holding the slider 109 having a larger diameter than the operation wire 98 so as to be movable in the linear axis direction, and the connection portion 300 is increased in size. As a result, the sliding friction between the spring member 140 and the inner surface of the holding hole 300a and the 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 damaged by these sliding friction (that is, the amount of contraction of the spring member 140 decreases), so that the excess length ma passing through the connecting portion 105 cannot be sufficiently absorbed.

In contrast to this comparative example, since the coupling portion 105 according to embodiment 1 holds the wire end 98a of the small-diameter operating wire 98 so as to be movable in the linear axial direction, the holding hole 136 can be made smaller than the holding hole 300a of the comparative example, and as a result, the coupling portion 105 is made smaller than the coupling portion 300 of the comparative example.

In particular, since the spring member 140 that can be used for the connection portions 105 and 300 is a small spring member having an inner diameter of about 1.5 to 3.0mm and a linear shape of about 0.15 to 0.40mm, the biasing force is 0.5 to 3.0N, and cannot be set too large. Therefore, by reducing the size of the connecting portion 105 according to embodiment 1, the sliding friction between the spring member 140 and the inner surface of the holding hole 136 and the sliding friction between the inner surface of the guide tube 111 and the outer surface of the connecting portion 105 are suppressed, and the amount of contraction of the spring member 140 during the collapsing operation can be sufficiently secured. As a result, the excess length ma of the operation wire 98 can be sufficiently absorbed by the connection portion 105, and therefore buckling of the operation wire 98 during the lodging operation can be reliably prevented.

[ modification of resistance applying portion ]

In the connecting portion 105 of embodiment 1 described above, when the raising operation lever 74 is operated to fall down, the spring member 140 applies resistance to the movement of the wire end 98a or the like in the holding hole 136 (the movement in the 2 nd direction B) accompanying the movement of the connecting portion 105 or the like in the 1 st direction a, but other resistance applying portions may be used as shown in embodiments 2 to 5 below. The resistance applying portion of the present invention is not limited to the resistance applying portions of the respective embodiments.

The endoscope 1 according to embodiments 2 to 5 described below has basically the same configuration as the endoscope 1 according to embodiment 1 described above, except that it includes a resistance applying portion different from the spring member 140. Therefore, the same reference numerals are given to the same parts in function and structure as those of the above embodiment 1, and the description thereof will be omitted.

< connection part of endoscope in embodiment 2 >

Fig. 13 is a sectional view of the connecting portion 105A of the endoscope 1 according to embodiment 2. As shown in fig. 13, a cylindrical friction plate 142 (corresponding to a resistance applying portion of the present invention) is provided on the inner surface of the holding hole 136 of the connecting portion 105A according to embodiment 2, instead of the spring member 140.

The friction plate 142 is provided at a portion on the 1 st 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. Therefore, when the connecting portion 105A or the like is moved in the 1 st direction a by the falling operation, the friction plate 142 applies resistance to the movement of the wire end portion 98a or the like in the holding hole 136. Accordingly, when the load F in the 1 st direction a applied from the slider 109 or the like to the connecting portion 105A by the falling operation is smaller than a predetermined value, the wire end portion 98a or the like is frictionally coupled to the friction plate 142, and the wire end portion 98a or the like moves integrally with the connecting portion 105A in the 1 st direction a. As a result, the distance L is kept constant as in embodiment 1.

When the magnitude of the load F in the 1 st direction a applied from the slider 109 or the like to the connecting portion 105A is equal to or greater than the predetermined value, the wire end portion 98a or the like moves in the 2 nd direction B in the holding hole 136 against the frictional force (resistance force) of the friction plate 142. That is, the connection portion 105A moves relative to the wire end portion 98a and the like in the 1 st direction a. Thus, as in embodiment 1, the distance L is shortened, and therefore buckling of the operation wire 98 is prevented from occurring during the lodging operation.

When the raising operation is performed, a load F in the 2 nd direction B is applied to the connection portion 105A from the slider 109 and the like. The restoring force of the treatment instrument bent by the raising table 60 acts as a force applied to the thread end portion 98a in the 1 st direction a via the raising table 60 and the like. Therefore, even if the wire end 98a or the like is separated from the movement restricting portion 138 by the lodging operation, the wire end 98a or the like moves relatively in the 1 st direction a in the holding hole 136 and abuts against the movement restricting portion 138. Thus, as in the case of embodiment 1, when the raising operation is performed, the connection portion 105A, the string end portion 98a, and the like can be pulled integrally in the 2 nd direction B, and therefore, a direct operation feeling can be given to the operator.

The position of the friction plate 142 in the holding hole 136 is not limited to the position shown in the drawings, and may be changed as appropriate, and may be provided across the entire length of the holding hole 136, for example. The shape of the friction plate 142 is not limited to the cylindrical shape shown in the drawings, and may be any shape.

< connection part of endoscope in embodiment 3 >

Fig. 14 is a sectional view of the connecting portion 105B of the endoscope 1 according to embodiment 3. As shown in fig. 14, a damper chamber 151 (corresponding to a resistance applying portion of the present invention) that seals a gas 150A or a liquid 150B is provided in the holding hole 136 of the connecting portion 105B of embodiment 3, instead of the spring member 140. In this case, an O-ring (not shown) or the like is attached to the outer circumferential surface of the piston 135 on the 2 nd direction B side, thereby ensuring airtightness of the damper chamber 151.

The damper chamber 151 applies a biasing force f applied to the wire end portion 98a and the like in the 1 st direction a (the movement restricting portion 138) side, similarly to the spring member 140 of the above-described embodiment 1, and functions similarly to the spring member 140. Thus, also in embodiment 3, as in embodiment 1, buckling of the operation wire 98 can be prevented when the lodging operation is performed, and a sense of direct operation can be given to the operator when the raising operation is performed.

< connection part of endoscope in embodiment 4 >

Fig. 15 is a sectional view of the connecting portion 105C of the endoscope 1 according to embodiment 4. As shown in fig. 15, an annular 1 st magnet 155 is provided at the movement restricting portion 138 at the end portion in the 1 st direction a of the holding hole 136 in the connecting portion 105C according to embodiment 4. An annular 2 nd magnet 156 is provided at a position facing the 1 st magnet 155 at the wire end portion 98a and the like (the piston 135).

The 2 nd magnet 156 has a different magnetic pole from the 1 st magnet 155, and generates an attractive force with the 1 st magnet 155. The attractive force acts as a biasing force f (see fig. 7) applied to the wire end portion 98a and the like in the 1 st direction a (the movement restricting portion 138) similarly to the spring member 140 of the above-described embodiment 1. Therefore, the 1 st magnet 155 and the 2 nd magnet 156 function similarly to the spring member 140 of the above-described embodiment 1. Thus, also in embodiment 4, similarly to embodiment 1, buckling of the operation wire 98 can be prevented when the lodging operation is performed, and a direct operation feeling can be given to the operator when the raising operation is performed.

Further, if an attractive force acting as the urging force f can be generated between the end portion on the 1 st direction a side of the holding hole 136 and the string end portion 98a or the like, the position and shape of the 1 st magnet 155 in the end portion on the 1 st direction a side of the holding hole 136 and the position and shape of the 2 nd magnet 156 in the string end portion 98a or the like can be appropriately changed.

< connection part of endoscope in embodiment 5 >

Fig. 16 is a sectional view of the connecting portion 105D of the endoscope 1 according to embodiment 5. As shown in fig. 16, the disk-shaped 1 st magnet 158 is provided on the bottom 136a at the end portion on the 2 nd direction B side of the holding hole 136 in the connecting portion 105D according to embodiment 5. Further, a disc-shaped 2 nd magnet 159 is provided at a position facing the 1 st magnet 158 at the wire end portion 98a and the like (the piston 135).

The 2 nd magnet 159 has the same magnetic pole as the 1 st magnet 158, and generates a repulsive force with the 1 st magnet 158. As in the case of embodiment 1, the repulsive force acts as a biasing force f applied to the wire end portion 98a and the like in the 1 st direction a (movement restricting portion 138). Therefore, the 1 st magnet 158 and the 2 nd magnet 159 perform the same functions as the spring member 140 of the above-described embodiment 1. Thus, in embodiment 5 as well, similarly to embodiment 1, buckling of the operation wire 98 can be prevented when the lodging operation is performed, and a sense of direct operation can be given to the operator when the raising operation is performed.

Further, if a repulsive force acting as the urging force f can be generated between the end portion on the 2 nd direction B side of the holding hole 136 and the wire end portion 98a or the like, the position and shape of the 1 st magnet 158 in the end portion on the 2 nd direction B side of the holding hole 136 and the position and shape of the 2 nd magnet 159 in the wire end portion 98a or the like can be appropriately changed.

[ others ]

In the above embodiments, the raising table 60 is tilted and raised by the rotation operation of the raising operation lever 74, but the raising table 60 may be tilted and raised by various operation members such as a push-pull operation member that performs a push-pull operation.

In the above embodiments, various resistance applying members such as the spring member 140 are provided in the holding hole 136, but the resistance applying members may be omitted. In this case, the distance L is also shortened by the load F in the 1 st direction a applied from the slider 109 to the connecting portion 105 and the like by the falling operation, and therefore the excess length ma of the operation wire 98 is absorbed by the connecting portion 105 and the like, and buckling of the operation wire 98 can be prevented. When the raising operation is performed, the thread end portion 98a and the like are relatively moved in the 1 st direction a in the holding hole 136 by the restoring force of the treatment instrument and come into contact with the movement restricting portion 138, so that the connecting portion 105 and the thread end portion 98a and the like can be integrally pulled in the 2 nd direction B.

In the above embodiments, the buckling prevention of the operation wire 98 when the operation wire 98 is further pushed in the 1 st direction a in the state where the rising base 60 is located at the falling position is described, but the present invention is not limited thereto. For example, in a state where the rotation of the standing stand 60 to the collapsed position is restricted by abutting against the inner wall or the like in the body cavity, even when the collapsing operation is performed, a load against the movement in the 1 st direction a is applied to the operation wire 98, and therefore the operation wire 98 is in the above-described loaded state. In this case, the distance L is shortened by the connection portion 105 and the connection portions 105A to 105D, whereby at least a part of the amount of pressing of the operation wire 98 can be absorbed (the amount of pressing can be reduced), and buckling of the operation wire 98 can be prevented.

In the above embodiments, the ultrasonic endoscope is exemplified as the endoscope 1, but the present invention can be applied to various endoscopes having the standing stand 60 such as a duodenoscope (side view endoscope), a straight view mirror, and a strabismus mirror, and a wire push-pull device used in the various endoscopes.

Claims (12)

1. A wire push-pull device provided in an endoscope, the endoscope comprising: an insertion portion having a leading end and a base end; an operation portion connected to a proximal end side of the insertion portion; an operating member provided on the operating portion; a stand rotatably provided on a distal end side of the insertion portion; and an operation wire which is arranged from the front end of the insertion portion to the operation portion and is pushed and pulled according to the operation of the operation member to rotate the standing table,

the wire push-pull device is provided with:

a link mechanism coupled to the operating member in the operating portion, the link mechanism including a slider that slides in a direction of a spool of the operating wire in accordance with the operation; and

a connecting portion that connects the slider and a wire end portion of the operating wire in the operating portion, the connecting portion being connected to the slider on one end side in the axial direction and holding the wire end portion so as to be movable in the axial direction on the other end side in the axial direction,

the bobbin direction includes a 1 st direction in which the operation wire is pushed toward a distal end side of the insertion portion and a 2 nd direction in which the operation wire is pulled toward a proximal end side of the insertion portion,

it is characterized in that the preparation method is characterized in that,

the connecting portion, when moved in the 1 st direction by the slider in the operation, relatively moves in the 1 st direction with respect to the wire end portion to shorten a distance between the slider and the wire end portion, and when moved in the 2 nd direction, integrally moves the wire end portion in the 2 nd direction.

2. The wire push-pull device according to claim 1,

the connecting portion is configured to shorten the distance according to a magnitude of a load applied to the connecting portion from the slider when the connecting portion moves in the 1 st direction.

3. The wire push-pull device according to claim 2,

when the connecting part moves to the 1 st direction, and when the load applied to the connecting part from the slider is less than a certain value, the wire end part integrally moves to the 1 st direction, and when the load is more than a certain value, the distance is shortened according to the magnitude of the load.

4. The wire push-pull device according to any one of claims 1 to 3, comprising:

a holding hole formed in an end portion of the connecting portion in the 1 st direction, the holding hole holding the wire end portion so as to be movable in the bobbin direction; and

and a resistance applying portion provided in the holding hole, the resistance applying portion applying a resistance to movement of the wire end portion in the holding hole when the connecting portion moves in the 1 st direction.

5. The wire push-pull device according to claim 4, comprising a movement restricting portion that is provided at an end of the holding hole in the 1 st direction and restricts movement of the wire end in the 1 st direction,

the resistance applying portion applies, as the resistance, a biasing force that biases the wire end portion toward the movement restricting portion to the wire end portion,

when the operation wire is in a non-load state, the wire end portion receives the urging force from the resistance applying portion and abuts against the movement restricting portion.

6. The wire push-pull device according to claim 4,

a bottom is provided on an end portion of the holding hole in the 2 nd direction,

the resistance applying portion is a spring member disposed between the wire end portion and the bottom portion within the holding hole.

7. The wire push-pull device according to claim 4,

the resistance applying portion is a friction plate provided on an inner surface of the holding hole.

8. The wire push-pull device according to claim 4,

a bottom is provided on an end portion of the holding hole in the 2 nd direction,

the resistance applying portion is a damping chamber that is disposed between the wire end portion and the bottom portion in the holding hole and seals gas or liquid.

9. The wire push-pull device according to claim 4,

the resistance applying portion includes:

a 1 st magnet provided on an end of the holding hole in the 1 st direction; and

and a 2 nd magnet disposed at an end of the wire and generating an attractive force with the 1 st magnet.

10. The wire push-pull device according to claim 4,

the resistance applying unit includes:

a 1 st magnet provided on an end of the holding hole in the 2 nd direction; and

and a 2 nd magnet disposed at an end of the line and generating a repulsive force with the 1 st magnet.

11. The wire push-pull device according to claim 4,

a movement restricting portion that restricts movement of the wire end portion in the 1 st direction is provided on an end portion of the holding hole in the 1 st direction,

when the connection portion moves in the 2 nd direction, the movement restricting portion abuts against the wire end portion to integrally move the wire end portion in the 2 nd direction.

12. An endoscope, comprising:

an insertion portion having a leading end and a base end;

an operation portion connected to a proximal end side of the insertion portion;

an operating member provided on the operating portion;

a stand rotatably provided on a distal end side of the insertion portion; and

an operation wire which is arranged from the front end of the insertion portion to the operation portion and is pushed and pulled according to the operation of the operation member to rotate the rising base,

it is characterized in that the preparation method is characterized in that,

the endoscope further comprises a wire push-pull device according to any one of claims 1 to 11.

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