JP2013158570A - Endoscope and medical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope having a configuration capable of reliably mechanically preventing a pulled member from being pulled even if an operator unintentionally slightly touches an operation member in a non-operation state.SOLUTION: An endoscope includes: a pulling wire 10 for bending a bending section 4 by pulling it; a joystick 8 for inputting a pulling operation or a releasing operation of the pulling wire 10; a drive member 20 for allowing a C-ring 22 to impart an auxiliary pulling force to the pulling wire 10 by the rotation in accordance with the input operation of the joystick 8; and a slider 25 for stopping the auxiliary pulling force to be imparted from the drive member 20 to the pulling wire 10, when the joystick 8 is not operated. The drive member 20 is rotated by releasing the stopping by the slider 25 caused by the input operation of the joystick 8, and imparts the auxiliary pulling force to the pulling wire 10.

Description

  The present invention relates to an endoscope and a medical device that include an insertion portion that is inserted into a subject and that includes a bending portion that is curved in a plurality of directions.

  In recent years, an endoscope having an insertion portion to be inserted into a subject has been widely used in the medical field and the industrial field. Endoscopes used in the medical field observe an organ in a body cavity by inserting a long and thin insertion portion into a body cavity as a subject, and insert a channel for a treatment tool provided in the endoscope as necessary Various treatments can be performed using the treatment tool inserted in the inside.

  In addition, endoscopes used in the industrial field are designed to insert a long and narrow insertion portion of an endoscope into a jet engine or a subject such as a pipe of a factory. Observations such as corrosion and inspections such as various treatments can be performed.

  Here, a configuration in which a bending portion that can be bent in a plurality of directions is provided on the distal end side in the insertion direction of the insertion portion of the endoscope (hereinafter simply referred to as the distal end side) is well known.

  Specifically, the distal end in the insertion direction of a pulling wire, which is a pulling member inserted through the insertion portion and the operation portion (hereinafter simply referred to as the distal end), is connected to the bending portion, and is provided in the operation portion. When the pulling wire is pulled by the operating member, the bending portion can be bent in a plurality of directions.

  Here, the configuration of an endoscope having an electric assist mechanism that electrically assists the pulling operation of the bending wire is well known, and is disclosed in, for example, Patent Document 1.

  In the electric assist mechanism disclosed in Patent Document 1, a pulley that is rotated in one direction by a motor or the like in the operation portion, and a C-shaped friction engagement member that is provided on the outer periphery of the pulley so as to be able to contact the pulley. The friction engagement member has a configuration in which a midway position of the pulling wire is wound.

  In this electric assist mechanism, when the pulling wire is pulled by the operation member, the friction engagement member is reduced in diameter by the wound pulling wire, contacts the pulley with friction force, and rotates in one direction together with the pulley. The rotation assisting force is applied to the pulling wire by the rotation.

  Note that the pulling wire is applied to the pulling wire by pressing the pulling wire with an input operation member or the like against a pulley rotating in one direction by a motor or the like without using the C-ring. A configuration in which the pulley is pulled with the assistance of rotation of the pulley and a configuration in which a pulling wire wound around the outer periphery of the pulley is pulled by rotating the pulley by applying a rotational force to the pulley from another member are also known.

JP 2008-035882 A JP 2007-185355 A

  However, in the configuration disclosed in Patent Document 1, although the operation member is not operated, foreign matter mixed between the pulley and the C ring, aging of the C ring, etc. There is a case where the frictional sliding state is large. As a result, the bending portion is bent with an operation force amount lighter than the assumed operation force amount of the operator. Therefore, the bending portion may bend even if the operator unintentionally touches the operation member lightly. It is necessary to prevent this unintended bending of the bending portion.

  Note that the above is the same even in a configuration in which the above-described C-ring is not used for the driving member, and the pulling wire is pressed against the operating member by a foreign matter or the like mixed between the operating member and the pulling wire. The pulling wire tends to bite and the friction between the pulley and the pulling wire becomes large, or the pulley rotates due to foreign matter mixed between the pulley and the member that rotates the pulley. In some cases, the pulling wire tends to bite suddenly, resulting in a friction engagement state in which the friction between the pulley and the pulling wire is large. As a result, the bending portion is bent with an operation force amount that is lighter than the assumed operation force amount of the operator. Therefore, the bending portion may bend even if the operator unintentionally touches the operation member lightly. It is necessary to prevent this unintended bending of the bending portion.

  The present invention has been made in view of the above circumstances, and mechanically reliably prevents the traction member from being pulled even if the operator makes a light contact unintentionally with the operation member in a non-operation state. An object is to provide an endoscope and a medical device having a configuration.

  In order to achieve the above object, an endoscope according to an aspect of the present invention is an endoscope that includes an insertion portion that is inserted into a subject, and in which the insertion portion is provided with a bending portion that is curved in a plurality of directions. And a traction member inserted into the insertion portion for bending the bending portion by traction, and an input of a traction operation of the traction member provided on an operation portion at a proximal end of the insertion portion in the insertion direction. An operation member to be performed, a drive member provided in the operation unit, and at least a part of the drive member that applies a pulling assisting force to the pulling member by rotation with the input operation of the operation member; and a drive member provided in the operation unit; A stopper that stops the traction assisting force applied from the drive member to the traction member when the operation member is not operated, and the drive member is moved forward by the stopper by an input operation of the operation member. Rotated by the stop is released, to impart said traction assisting force with respect to the traction member.

An endoscope according to another aspect of the present invention includes an insertion portion that is inserted into a subject, and the insertion portion is provided with a bending portion that bends in a plurality of directions. A traction member that is inserted into the insertion portion and that bends the bending portion by traction; and an operation member that is provided in an operation portion at a proximal end of the insertion portion in the insertion direction and that inputs a traction operation of the traction member; A drive member provided in the operation unit, and at least a part of the drive member for applying a pulling assisting force by rotation to the pulling member in accordance with an input operation of the operation member; and the drive member provided in the operation unit. A stopper that stops the traction assisting force applied from the drive member to the traction member when rotated at a set speed or higher.
Furthermore, the medical device according to one aspect of the present invention is a medical device that includes an insertion portion that is inserted into a subject, and is provided with a bending portion that bends in a plurality of directions in the insertion portion. A traction member that is inserted through the traction member to bend the bending portion by traction, an operation member that is provided in an operation portion at a proximal end of the insertion portion in the insertion direction, and that inputs a traction operation of the traction member; A drive member that is provided in the operation unit and that provides at least a part of the traction member with a traction assist force by an input operation of the operation member, and the operation member that is provided in the operation unit is not operated. A stopper for stopping the traction assist force applied from the drive member to the traction member, and the drive member is released from the stop by the stopper by an input operation of the operation member. It is the rotation by, for applying the traction assisting force with respect to the traction member.

  According to the present invention, even if an operator unintentionally touches a non-operating operation member lightly, an endoscope having a configuration that mechanically and reliably prevents the pulling member from being pulled, medical treatment Equipment can be provided.

The perspective view which shows schematically the endoscope which shows 1st Embodiment The figure which shows only the structure which curves the curved part of FIG. 1 with a stopper, and shows schematically The figure which shows schematically the curved structure of the curved part when the joystick of FIG. 2 is operated with the cancellation | release structure of a stopper The figure which shows schematically the modification which used the gear for the stopper of FIG. 2 with the structure which curves a bending part. The figure which shows schematically the curved structure of the curved part when the joystick of FIG. 4 is operated with the cancellation | release structure of a stopper The figure which shows schematically the modification which used the L-shaped member for the stopper of FIG. 2 with the structure which curves a bending part. The figure which looked at the L-shaped member of FIG. 6, a conical member, and the pull wire from the VII direction in FIG. The figure which shows schematically the curved structure of the curved part when the joystick of FIG. 6 is operated with the cancellation | release structure of a stopper The figure which shows schematically the modification using the gear which can move to an axial direction for the stopper of FIG. 2 with the structure which curves a bending part. The figure which looked at the structure which curves the bending part of FIG. 9, and the structure of a stopper from the X direction in FIG. Sectional view taken along line XI-XI in FIG. The figure which shows schematically the curved structure of the curved part when the joystick of FIG. 10 is operated with the cancellation | release structure of a stopper. The figure which shows schematically only the structure which curves the bending part of the insertion part of the endoscope of 2nd Embodiment with a stopper. The figure which looked at the structure which curves the bending part of FIG. 13, and the structure of a stopper from the XIV direction in FIG. The figure which shows the state which pushed down the pulley with the frame of the joystick of FIG. The figure which shows the modification which pushes down the gear for a stopper with a joystick The figure which shows schematically only the structure which curves the bending part of the insertion part of the endoscope of 3rd Embodiment with a stopper. The figure which shows schematically the curved structure of the curved part when the joystick of FIG. 17 is operated with the cancellation | release structure of a stopper. The figure which shows the modification which used the meshing member for the stopper of FIG. The figure which looked at the structure which curves the curved part of FIG. 19, and the structure of a stopper from the IIX direction in FIG. The figure which shows schematically the curved structure of the curved part when the joystick of FIG. 19 is operated with the cancellation | release structure of a stopper The figure which looked at the structure which curves the curved part of FIG. 21, and the structure of a stopper from the IIXII direction in FIG. The figure which shows schematically only the structure which curves the bending part of the insertion part of the endoscope of 4th Embodiment with a stopper. The figure which shows schematically the motion of the stopper when C ring of FIG. 23 rotates rapidly The figure which shows the modification which provided a part of stopper in the gear which meshes with C ring of FIG. The figure which shows the modification which provided the stopper in the position different from the drive member of FIG. The figure which shows the modification which provided the stopper in the position between the curved part and drive member in the pulling wire of FIG. The figure which shows roughly the motion of the stopper when C ring of FIG. 27 rotates rapidly The figure which shows schematically only the structure which curves the bending part of the insertion part of an endoscope with the stopper different from FIG. 29 is a partial cross-sectional view of the pulley taken along line IIIX-IIIX in FIG. 29 is a partial sectional view showing a state in which the claw portion protrudes from the hole of the pulley of FIG. 29 and is engaged with the stopper member. The figure which shows schematically only the structure which curves the bending part of the insertion part of an endoscope with the stopper different from FIG.23, FIG.29. The figure which shows schematically only the structure of the drive part in the endoscope of 5th Embodiment with a stopper. The figure which shows roughly the motion of the stopper when C ring of FIG. 33 rotates rapidly

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view schematically showing an endoscope showing the present embodiment.
As shown in FIG. 1, an endoscope 1 includes an insertion portion 2 to be inserted into a subject and an operation connected to a proximal end in the insertion direction S of the insertion portion 2 (hereinafter simply referred to as a proximal end). And a universal cord 6 extending from the operation portion 5 to form a main portion, and a peripheral device via a connector (not shown) provided at the extended end of the universal cord 6 It can be connected freely.

  The insertion portion 2 includes a distal end portion 3, a bending portion 4, and a flexible tube portion 7, and the main portion is formed in an elongated shape along the insertion direction S.

  The bending portion 4 is operated to be bent in a plurality of directions, for example, up, down, left and right, for example, by a joystick 8 which is an operation member provided in the operation portion 5. The joystick 8 is used to input a pulling operation of the pulling wire 10 described later.

  Briefly, the bending configuration of the bending portion 4 will be described. In the insertion portion 2 and the operation portion 5, a plurality of, for example, four pulling wires 10r, 10l, 10d, 10u (hereinafter collectively referred to as pulling members). (Referred to as a wire 10) are inserted 90 ° apart in the circumferential direction of the insertion portion 2, and the tips of the pulling wires 10 r, 10 l, 10 d, and 10 u are connected to the bending portion 4.

  The pulling wire 10r is pulled along with an input operation by the joystick 8 to bend the bending portion 4 in the right direction. Further, the pulling wire 101 is bent in accordance with an input operation by the joystick 8 to bend the bending portion 4 in the left direction.

  Further, the pulling wire 10d is bent in accordance with an input operation by the joystick 8 to bend the bending portion 4 downward. The pulling wire 10u bends in accordance with an input operation by the joystick 8 to bend the bending portion 4 upward.

  In the operation unit 5, a drive member 20 is provided that at least partially applies a pulling assisting force by rotating the pulling wire 10 in response to an input operation of the joystick 8. The main portion is configured to include a C-ring 22 that is a friction engagement member.

  The pulley 21 is formed in an elongated cylindrical shape along the width direction H of the operation portion 5 which is a direction orthogonal to the insertion direction S, and is arranged in one direction R1 in the rotation direction R by a motor (not shown). When the power supply of the endoscope 1 is turned on, the endoscope 1 is always rotated.

  Four C rings 22 are provided as C rings 22 r, 22 l, 22 d, and 22 u on the outer periphery of the pulley 21 along the width direction H, and are positioned on the outer periphery of the pulley 21.

  Further, midway positions of the pulling wires 10r, 10l, 10d, and 10u are wound around the outer circumferences of the four C rings 22r, 22l, 22d, and 22u, respectively.

  Specifically, as shown in FIG. 2 to be described later, the pulling wire 10 extending from the distal end side to the rear in the insertion direction S (hereinafter simply referred to as the rear) is a cutout formed in the C ring 22. It is wound around the outer periphery of the C ring 22 by being wound from the one end 22i side, extending along the outer periphery of the C ring 22 and then extending backward from the other end 22t side.

  As a result, the tip end side of the pulling wire 10 is pulled when the C-ring 22 is rotated in one direction R1, and is relaxed when it is rotated in the other direction R2 opposite to the one direction R1. Yes.

  The C ring 22r may be a common C ring with the C ring 22l, and the pulling wires 10r and 10l may be wound around the common C ring. Further, the C ring 22u may be a common C ring with the C ring 22d, and the pulling wires 10u and 10d may be wound around the common C ring.

  In addition, the leading ends of the pulling wires 10r, 10l, 10d, and 10u positioned between the driving member 20 and the bending portion 4 are positioned loosely when the joystick 8 is not operated, and the driving member 20 and the joystick 8 are located. The pulling wires 10r, 10l, 10d, and 10u positioned between the base end side in the insertion direction S (hereinafter simply referred to as the base end side) are also connected via the guide rollers 12 and 13 when the joystick 8 is not operated. Each base end is connected to a joystick 8.

  As the pulling wire 10 is pulled by the input operation of the joystick 8, the C-ring 22 contacts the pulley 21 with a frictional force and rotates with the pulley 21 in one direction R <b> 1, thereby pulling the pulling wire 10. Auxiliary power is given.

  Specifically, for example, when the pulling wire 10u is pulled along with the joystick 8 being tilted upward, the C-ring 22u is reduced in diameter, and contacts the outer periphery of the pulley 21 with a frictional force.

  Therefore, the C-ring 22u rotates in one direction R1 together with the pulley 21, thereby applying a traction assist force to the distal end side of the traction wire 10u. As a result, the bending portion 4 is bent upward.

  At this time, since the C-rings 22r, 22l, and 22d are not in contact with the outer periphery of the pulley 21, the pulling wires 10r, 10l, and 10d are not pulled.

  The above-described pulling operation is the same for the C-rings 22r, 22l, and 22d, and the pulling wires 10r and 10l are pulled as the joystick 8 is tilted right, left, and downward. The C-rings 22r, 22l, and 22d are reduced in diameter, and are configured to bend the bending portion 4 to the right, left, and downward using contact with the outer periphery of the pulley 21 with frictional force.

  Next, the stopper configuration of the C-ring 22 when the joystick 8 is not operated will be described with reference to FIGS.

  2 is a diagram schematically showing only the configuration for bending the bending portion of FIG. 1 together with the stopper, and FIG. 3 is a configuration for releasing the stopper when the joystick of FIG. 2 is operated. FIG.

  Hereinafter, the four pulling wires 10r, 10l, 10u, and 10d are shown as the pulling wire 10, and the four C rings 22r, 22l, 22u, and 22d are shown as the C ring 22. That is, the description related to the pulling wire 10 corresponds to all four pulling wires 10r, 10l, 10u, and 10d, and the description related to the C ring 22 applies to all four C rings 22r, 22l, 22u, and 22d. It will be equivalent.

  As shown in FIGS. 2 and 3, from the proximal end side of the pulling wire 10, specifically, from the position between the driving member 20 and the joystick 8, the fixing releasing wire 28 that is a fixing releasing member via the ring 30. Has been extended. A stopper 32 (to be described later) of the ring 30 is provided in the operation unit 5.

  A midway position of the fixing release wire 28 is bent in an L shape via a guide roller 29, and an end 28 s that is an extending end of the fixing release wire 28 is connected to a slider 25 that is a stopper.

  The slider 25 is formed with an elongated through hole 25h along the insertion direction S that penetrates in the width direction H. The pin 26 has both ends fixed to the inner wall of the operation portion 5 in the through hole 25h. Is inserted.

  The slider 25 stops the traction assisting force applied from the driving member 20 to the traction wire 10 when the joystick 8 is not operated.

  Specifically, a stopper groove 22a, which is an engaged portion, is formed on the outer periphery of the C-ring 22 at a position different in the direction H from the position where the pulling wire 10 is wound. The tip of the slider 27, to which the tip of the spring 27 whose one end is fixed to the inner wall of the operation unit 5 is connected, is engaged by the urging force of the spring 27, thereby restricting the rotation of the C ring 22 in one direction R1. Has been.

  Thus, the slider 25 stops the pulling assisting force applied from the driving member 20 to the pulling wire 10 when the joystick 8 is not operated. In this state, the C-ring 22 can rotate only in the other direction R2 opposite to the one direction R1.

Next, the operation of the present embodiment will be described.
When the joystick 8 is not operated, the slider 25 is engaged with the stopper groove 22a of the C ring 22 by the urging force of the spring 27 as shown in FIG. The rotation of is regulated.

  In this state, in order to bend the bending portion 4 using the above-described configuration, first, as shown in FIG. 3, when the joystick 8 is tilted, the slack between the drive member 20 and the joystick 8 loosened on the pulling wire 10. The position of is pulled.

  Accordingly, the fixing release wire 28 is also pulled upward in FIG. 3 by the ring 30 until the ring 30 comes into contact with the stopper 32, and is bent into an L shape via the guide roller 29. By pulling the tip 28 s of the fixing release wire 28, the slider 25 also moves rearward until the tip of the through hole 25 h contacts the pin 26 against the biasing force of the spring 27. As a result, the engagement of the slider 25 with the stopper groove 22a of the C ring 22 is released.

  Further, when the position is pulled between the drive member 20 of the pulling wire 10 and the joystick 8, as described above, the diameter of the C ring 22 is reduced, so that the C ring 22 rotates in one direction R1. The outer periphery of the pulley 21 is brought into contact with a frictional force.

  At this time, since the rotation restriction of the C ring 22 by the slider 25 is released, the curved portion 4 and the driving member 20 that are loose in the pulling wire 10 are rotated by rotating the C ring 22 together with the pulley 21 in one direction R1. When this position is pulled by applying a pulling assisting force to a position between and the bending portion 4, the bending portion 4 to which the tip of the pulling wire 10 is fixed is bent.

  When the input operation of the joystick 8 is released, the position of the pulling wire 10 between the drive member 20 and the joystick 8 is relaxed, and the fixing release wire 28 is also relaxed via the ring 30, thereby 27, the slider 25 is re-fitted into the stopper groove 22a, whereby the rotation of the C-ring 22 in one direction R1 is restricted again.

  Thus, in the present embodiment, when the joystick 8 is not operated, the slider 25 engages with the stopper groove 22a on the outer periphery of the C ring 22, so that the rotation of the C ring 22 in one direction R1 is performed. Shown that it is regulated.

  Further, it is shown that the engagement of the slider 25 to the stopper groove 22a is released by pulling the fixing release wire 28 together with the pulling wire 10 in accordance with the input operation of the joystick 8.

  According to this, only when the joystick 8 is operated, the fixing by the slider 25 is released, and the C-ring 22 can be rotated in one direction R1, so that when the joystick 8 is not operated, for example, with the pulley 21 Even if foreign matter enters between the C ring 22 and the rotational force in one direction R1 of the pulley 21 is applied to the C ring 22 through the foreign matter, the slider 25 causes the C ring 22 to move in one direction. There is no rotation to R1.

  Therefore, it is possible to provide the endoscope 1 having a configuration that mechanically and reliably prevents the pulling wire 10 from being pulled even when the operator makes a light contact unintentionally with the joystick 8 in the non-operating state. it can.

  A modification will be described below with reference to FIGS. 4 and 5. 4 is a diagram schematically showing a modification using a gear in the stopper of FIG. 2 together with a configuration for bending the bending portion, and FIG. 5 is a bending configuration of the bending portion when the joystick of FIG. 4 is operated. It is a figure which shows roughly with the cancellation | release structure of a stopper.

  In the present embodiment described above, the stopper that restricts the rotation of the C ring 22 in one direction R1 when the joystick 8 is not operated is the slider 25 that can be engaged with the stopper groove 22a of the C ring 22. Indicated.

  Not limited to this, a non-rotating gear 33 may be used as a stopper. Specifically, as shown in FIGS. 4 and 5, gear teeth 22 b which are engaged portions are provided on the outer periphery of the C ring 22 instead of the stopper grooves 22 a, and the shaft 34 is connected to the gear teeth 22 b. By engaging the gear teeth 33a of the supported non-rotating gear 33, the rotation of the C-ring 22 in one direction R1 when the joystick 8 is not operated may be restricted.

  The shaft 34 is rotatable around the rotation shaft 35 at the lower end by pulling and loosening the fixing release wire 28 having the tip 28s fixed at the upper end, and the fixing release wire 28 is in a non-traction state by the spring 36. At this time, the gear teeth 33a of the gear 33 remain in a position where they mesh with the gear teeth 22b. Other configurations are the same as those of the present embodiment shown in FIGS.

  Therefore, in order to bend the bending portion 4 using the configuration shown in FIGS. 4 and 5, first, as shown in FIG. The position between is pulled.

  Accordingly, the fixing wire 28 is also pulled upward in FIG. 5 until the ring 30 comes into contact with the stopper 32, so that the shaft 34 rotates in one direction against the spring 36. To do. As a result, the engagement of the gear teeth 33a of the gear 33 with the gear teeth 22b of the C ring 22 is released.

  Further, when the position of the pulling wire 10 between the drive member 20 and the joystick 8 is pulled, as described above, the diameter of the C-ring 22 is reduced, so that the C-ring 22 rotates in one direction R1. The outer periphery of the pulley 21 is brought into contact with a frictional force.

  At this time, since the rotation restriction of the C-ring 22 by the gear 33 is released, the curved portion 4 and the driving member 20 that are loose in the pulling wire 10 are rotated by rotating the C-ring 22 together with the pulley 21 in one direction R1. When this position is pulled by applying a pulling assisting force to a position between and the bending portion 4, the bending portion 4 to which the tip of the pulling wire 10 is fixed is bent.

  When the input operation of the joystick 8 is released, the position of the pulling wire 10 between the drive member 20 and the joystick 8 is relaxed, and the fixing release wire 28 is also relaxed via the ring 30, thereby The shaft 34 is rotated in the other direction opposite to the one direction by 36, and the gear teeth 33a of the gear 33 are reengaged with the gear teeth 22b, whereby the rotation of the C ring 22 in one direction R1 is restricted again. The

  Even with such a configuration, the same effect as that of the present embodiment described above can be obtained.

  Hereinafter, another modification will be described with reference to FIGS. FIG. 6 is a diagram schematically showing a modified example in which an L-shaped member is used for the stopper of FIG. 2 together with a configuration in which a bending portion is bent, and FIG. 7 shows the L-shaped member, conical member, and pulling wire of FIG. FIG. 8 is a diagram viewed from the VII direction in FIG. 6, and FIG. 8 is a diagram schematically showing the bending configuration of the bending portion when the joystick in FIG. 6 is operated, together with the stopper releasing configuration.

  In the present embodiment described above, the stopper that restricts the rotation of the C ring 22 in one direction R1 when the joystick 8 is not operated is the slider 25 that can be engaged with the stopper groove 22a of the C ring 22. Indicated.

  Not only this but L-shaped member 41 may be used as a stopper. Specifically, as shown in FIGS. 6 and 7, in the present embodiment, nothing is formed on the outer periphery of the C-ring 22, and the drive member 20 and the bending portion 4 in the pulling wire 10 are not formed. A conical member 43, which is an engaged portion, is provided at a position therebetween. In addition, the conical member 43 is formed in the direction which has a vertex on the curved part 4 side along the pulling wire 10, for example, is comprised from three.

  As shown in FIG. 6, when the engaging portion 41 s of the L-shaped member 41 is engaged with the bottom portion 43 t of the conical member 43, the backward movement of the conical member 43 is caused to engage with the engaging portion 41 s of the L-shaped member 41. Therefore, application of traction force from the drive member 20 to the traction wire 10 is prevented.

  As shown in FIG. 7, the engagement portion 41 s of the conical member 43 of the L-shaped member 41 is formed with a hole 41 h for inserting the pulling wire 10, which is smaller than the diameter of the bottom portion 43 t of the conical member 43. Therefore, even when the conical member 43 is in contact with the engaging portion 41 s of the L-shaped member 41, the pulling wire 10 is not pushed down by the L-shaped member 41.

  Further, as shown in FIG. 8, the L-shaped member 41 has a tip 28s fixed in the vicinity of the rotating shaft 42 around the rotating shaft 42 at the end opposite to the engaging portion 41s of the conical member 43. The fixing release wire 28 can be rotated by pulling and loosening, and the spring 40 keeps the engaging portion 41 s in contact with the bottom portion 43 t of the conical member 43 when the fixing release wire 28 is not pulled. Other configurations are the same as those of the present embodiment shown in FIGS.

  Therefore, in order to bend the bending portion 4 using the configuration shown in FIGS. 6 to 8, first, as shown in FIG. The position between is pulled.

  Along with this, the ring 30 is pushed downward in FIG. 5 to pull the fixing release wire 28, so that the L-shaped member 41 rotates in one direction against the spring 40. As a result, the engagement of the engaging portion 41s of the L-shaped member 41 with the bottom 43t of the conical member 43 is released.

  Further, when the position is pulled between the drive member 20 of the pulling wire 10 and the joystick 8, as described above, the diameter of the C ring 22 is reduced, so that the C ring 22 rotates in one direction R1. The outer periphery of the pulley 21 is brought into contact with a frictional force.

  At this time, since the regulation of the pulling wire 10 by the L-shaped member 41 is released, the curved portion 4 and the driving member that are loose in the pulling wire 10 are rotated by rotating the C ring 22 together with the pulley 21 in one direction R1. When this position is pulled by applying a pulling assisting force to a position between the bending portion 4 and the bending portion 4, the bending portion 4 to which the tip of the pulling wire 10 is fixed is bent.

  When the input operation of the joystick 8 is released, the position of the pulling wire 10 between the drive member 20 and the joystick 8 is relaxed, and the fixing release wire 28 is also relaxed via the ring 30, so that the spring 40, the L-shaped member 41 rotates in the other direction opposite to the one direction, and the engaging portion 41s is re-fitted to the bottom portion 43t of the conical member 43, so that the rearward movement of the pulling wire 10 is again performed. Be regulated.

  Even if the engaging portion 41 s of the L-shaped member 41 is engaged at a position before the conical member 43, the conical member 43 is loosened with the pulling wire 10 due to the conical shape of the conical member 43. Since the L-shaped member 41 is pushed up through the hole 41h and moved to the front side of the L-shaped member 41, the engaging portion 41s of the L-shaped member 41 is surely positioned behind the conical member 43.

  Even with such a configuration, it is possible to obtain the same effect as the above-described embodiment, and it is possible to realize downsizing of the operation unit 5 provided with the drive member 20.

  Hereinafter, modified examples will be described with reference to FIGS. FIG. 9 is a diagram schematically showing a modified example in which the axially movable gear is used for the stopper of FIG. 2 together with a configuration for bending the bending portion, and FIG. 10 is a configuration for bending the bending portion of FIG. And FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 10, and FIG. 12 is a view of the bending portion when the joystick in FIG. 10 is operated. It is a figure which shows a curve structure with the cancellation | release structure of a stopper schematically.

  In the present embodiment described above, the stopper that restricts the rotation of the C ring 22 in one direction R1 when the joystick 8 is not operated is the slider 25 that can be engaged with the stopper groove 22a of the C ring 22. Indicated.

  Not limited to this, a non-rotating gear 46 may be used as a stopper as in FIGS.

  Specifically, as shown in FIGS. 9 and 10, gear teeth 22 b are provided on the outer periphery of the C ring 22, and the gear teeth 22 b are non-rotatably supported in the shaft 48 and movable in the axial direction J. By engaging the gear teeth 46a of the gear 46, the rotation of the C-ring 22 in one direction R1 when the joystick 8 is not operated may be restricted.

  As shown in FIG. 11, the gear 46 is formed with a hole 46h having a substantially elliptical cross section, and a shaft 48 having a slightly smaller diameter than the hole 46h having a substantially elliptical cross section is fitted into the hole 46h. Therefore, the rotation with respect to the shaft 48 is restricted. That is, it is not rotating.

  The gear 46 is movable in the axial direction J via a spring 47 through a hole 46h. The gear 46 urges the spring 47 so that when the joystick 8 is not operated, the gear teeth 46a are always engaged with the gear teeth 22b, thereby restricting the rotation of the C ring 22 in one direction R1. ing.

  Further, on the opposite side of the shaft 48 from the position where the spring 47 of the gear 46 is provided in the axial direction J, a guide member 45 is pivotally supported so as to be rotatable and movable in the axial direction J. That is, the guide member 45 and the gear 46 are provided coaxially with respect to the shaft 48.

  Further, a position between the driving member 20 of the pulling wire 10 and the joystick 8 is wound around the groove on the outer periphery of the guide member 45.

  As shown in FIG. 12, the guide member 45 pushes down the gear 46 against the biasing force of the spring 47 along the axial direction J when the pulling wire 10 is pulled by an input operation of the joystick 8. The engagement of the gear teeth 46a with the teeth 22b is released.

  Other configurations are the same as those of the present embodiment shown in FIGS.

  Therefore, in order to bend the bending portion 4 using the configuration of FIGS. 9 to 12, first, as shown in FIG. 12, when the joystick 8 is tilted, the drive member 20 and the joystick 8 that are loose in the pulling wire 10 are used. The position between is pulled.

  Along with this, the gear 46 is pushed down along the axial direction J by the guide member 45 against the urging force of the spring 47, so that the gear teeth 46 a of the gear 46 engage with the gear teeth 22 b of the C ring 22. Canceled.

  Further, when the position of the pulling wire 10 between the drive member 20 and the joystick 8 is pulled, as described above, the diameter of the C-ring 22 is reduced, so that the C-ring 22 rotates in one direction R1. The outer periphery of the pulley 21 is brought into contact with a frictional force.

  At this time, since the rotation restriction of the C ring 22 by the gear 46 is released, the curved portion 4 and the driving member 20 that are loose in the pulling wire 10 are rotated by rotating the C ring 22 together with the pulley 21 in one direction R1. When this position is pulled by applying a pulling assisting force to a position between and the bending portion 4, the bending portion 4 to which the tip of the pulling wire 10 is fixed is bent.

  When the input operation of the joystick 8 is released, the position of the pulling wire 10 between the drive member 20 and the joystick 8 is relaxed, and the guide member 45 moves in the direction away from the gear 46 in the axial direction J. As a result, the gear 46 also moves to the guide member 45 side by the bias of the spring 47, and the gear teeth 46a of the gear 46 are reengaged with the gear teeth 22b, so that the C ring 22 moves in one direction R1. The rotation is restricted again.

  Even with such a configuration, the same effect as that of the present embodiment described above can be obtained.

(Second Embodiment)
FIG. 13 is a diagram schematically showing only the configuration for bending the bending portion of the insertion portion of the endoscope according to the present embodiment together with the stopper, and FIG. 14 is the configuration for bending the bending portion of FIG. 13 and the configuration of the stopper. FIG. 15 is a diagram schematically showing a state in which the pulley is pushed down by the frame of the joystick in FIG. 14.

  The configuration of the endoscope according to the second embodiment is different from the endoscope according to the first embodiment shown in FIGS. 9 to 12 described above in that a C-ring is not used as a driving member. The point where the pulling wire is wound directly around the pulley of the member, the point where the pulley gear is engaged with the pulley gear, and the engagement of the stopper by moving the pulley in the axial direction using a joystick. The difference is that the combination is canceled.

  Therefore, only this difference will be described, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted.

  As shown in FIG. 14, a drive member 58 is provided in the operation unit 5, and at least part of the drive member 58 applies a traction force to the traction wire 10 by rotation in response to an input operation of the joystick 8.

  The drive member 58 includes rotatable pulleys 50r, 50l, 50u, and 50d that are supported by the shafts 60 so as to be movable in the axial direction J, and the pulleys 50r that are supported by the shafts 60. , 50l, 50u, 50d are provided on the inner wall side of the operation unit 5 with respect to the friction plate 54 provided on the inner wall side of the operation unit 5 with respect to each shaft 60. A gear 56 that is a rotating member connected to each friction plate 54 via a spring 55, a gear 51 meshed with each gear 56, and a motor 59 that rotates each gear 51 in one direction R1. The main part is composed.

  For each shaft 60, the pulleys 50r, 50l, 50u, 50d, the friction plate 54, and the gear 56 are provided coaxially.

  Further, the base ends of the pulling wires 10r, 10l, 10u, and 10d are wound around the outer circumferences of the pulleys 50r, 50l, 50u, and 50d, respectively. Gear teeth 50ra, 50la, 50ua, and 50da, which are engaged portions, are formed at positions shifted from the pulling wires 10r, 10l, 10u, and 10d, respectively.

  13 to 15, only the mechanism relating to the pulley 50r is shown, and the mechanism relating to the pulleys 50l, 50u, and 50d is omitted in order to simplify the drawings. Therefore, all the mechanisms possessed with respect to the pulley 50r also have the other pulleys 50l, 50u, and 50d.

  In the present embodiment, the proximal ends of the pulling wires 10r, 10l, 10u, and 10d are not connected to the joystick 8, but are simply wound around the outer circumferences of the pulleys 50r, 50l, 50u, and 50d. Only.

  The motor 59, the gear 51, and the gear 56 apply a rotational force in one direction R1 to the pulley 50r via the spring 55 and the friction plate 54 when the pulley 50r contacts the friction plate 54. The motor 59 is configured to always rotate in one direction R1 when the endoscope 1 is powered on.

  When the joystick 8 is not operated, the gear teeth 52a of the non-rotating gear 52, which is a stopper supported by the shaft 53, meshes with the gear teeth 50ra of the pulley 50r. The gear 52 regulates the traction force applied from the pulley 50r to the traction wire 10r when the joystick 8 is not operated.

  As shown in FIG. 13, the joystick 8 has frames 8r, 8l, 8u, and 8d having a cross shape in plan view at the bottom on the operation unit 5 side, and the frames 8r, 8l, 8u, and 8d are used. As shown in FIG. 15, by pushing down the pulleys 50r, 50l, 50u, 50d along the axial direction J, the gears of the pulleys 50r, 50l, 50u, 50d are moved relative to 50ra, 50la, 50ua, 50d. The meshing of the gear teeth 52a of the gears 52 that mesh with each other is released. In FIG. 13, the gear 52 that meshes with the gear teeth 50la, 50ua, and 50d is omitted.

  Next, the operation of the present embodiment will be described. In the following, the mechanism relating to the pulley 50r will be described as an example.

  When the joystick 8 is not operated, as shown in FIGS. 13 and 14, the gear teeth 52a of the gear 52 are engaged with the gear teeth 50ra of the pulley 50r, so that the pulley 50r rotates in one direction R1. It is regulated.

  In this state, to bend the bending portion 4 using the above-described configuration, first, as shown in FIG. 15, when the joystick 8 is tilted, the pulley 50 r is attached to the spring 55 by the frame 8 u of the joystick 8. It is pushed down along the axial direction J against the force.

  Accordingly, the gear teeth 50ra are disengaged from the gear teeth 52a of the gear 52, and the pulley 50r contacts the friction plate 54, so that the rotational force of the motor 59 is transmitted through the gears 51, 56 and the friction plate 54. Applied to the pulley 50r, and the pulley 50r rotates in one direction R1.

  As a result, the leading end of the pulling wire 10r is fixed by pulling this position by applying a pulling assisting force to the position of the pulling wire 10r between the bent curved portion 4 and the drive member 58. The bending portion 4 is bent upward.

  When the input operation of the joystick 8 is released, the gear teeth 50ra of the pulley 50r are again engaged with the gear teeth 52a of the gear 52 by the spring 55, so that the rotation of the pulley 50r in one direction R1 is restricted again. The

  The above operation is the same for the pulleys 50l, 50u, and 50d.

  As described above, in the present embodiment, when the joystick 8 is not operated, the gear teeth 52a of the gear 52 mesh with the gear teeth 50ra of the pulley 50r, thereby restricting the rotation of the pulley 50r in one direction R1. It has been shown.

  Further, it is shown that the meshing of the gear teeth 50ra with the gear teeth 52a of the gear 52 is released by the pulley 50r being pushed down by the frame 8u in accordance with the input operation of the joystick 8.

  According to this, only when the joystick 8 is operated, the fixing by the gear 52 is released, and the pulley 50r can rotate in one direction R1, so that when the joystick 8 is not operated, for example, friction with the pulley 50r. Even if a foreign substance enters between the plate 54 and the rotational force in one direction R1 is applied to the pulley 50r via the foreign substance, the pulley 50r is rotated in the one direction R1 by the gear 52. There is nothing. The above effects are the same even with the pulleys 50l, 50u, and 50d.

  Accordingly, it is possible to provide an endoscope 1 having a configuration that mechanically and reliably prevents the pulling wire 10 from being pulled even if the operator unintentionally touches the joystick 8 in a non-operating state. Can do.

  Hereinafter, a modification will be described with reference to FIG. FIG. 16 is a view showing a modification in which the stopper gear is pushed down by the joystick.

  In the above-described embodiment, it is shown that the operation of the joystick 8 pushes down the pulley 50r to release the engagement of the gear teeth 50ra with the gear teeth 52a of the gear 52.

  Not limited to this, as shown in FIG. 16, by operating the joystick 8, the first convex portion 8ua of the frame 8u pushes down the gear 52 ′, which is a stopper, and the gear 52 ′ is shifted to the gear teeth 52a ′. The teeth 50ra are disengaged and the second protrusion 8ub having a height different from that of the first protrusion 8ua of the frame 8u is pushed down so that the pulley 50r is shallower than the gear 52 'and does not engage with the gear 52' again. The pulley 50r may be brought into contact with the friction plate 54. The above configuration is the same for the pulleys 50l, 50u, and 50d.

(Third embodiment)
FIG. 17 is a diagram schematically showing only the configuration for bending the bending portion of the insertion portion of the endoscope according to the present embodiment, together with the stopper, and FIG. 18 shows the bending portion when the joystick in FIG. 17 is operated. It is a figure which shows a curve structure with the cancellation | release structure of a stopper schematically.

  The configuration of the endoscope according to the third embodiment is different from the endoscope according to the first embodiment shown in FIGS. 6 to 8 described above in that a C-ring is not used as a drive member. The point that the pulling wire is in direct contact with the pulley of the member, the point that the L-shaped member also serves as the drive member, and the point that the engagement of the L-shaped member is released using the press release wire extended from the joystick. Is different.

  Therefore, only this difference will be described, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted.

  As shown in FIGS. 17 and 18, in the present embodiment, the driving member 61 includes a pulley 65 and an L-shaped member 41 that is a pressing member and a stopper, and includes a main part.

  The pulley 65 is in contact with the middle position of the pulling wire 10, and is always rotatable in one direction R1 when the power of the endoscope 1 is turned on by a motor or the like (not shown). The pulling wire 10 is pulled when the pulling wire 10 comes into contact with the pulley 65 rotating in one direction R1.

  Also in the present embodiment, a combination of the pulling wires 10r, 10l, 10u, and 10d is referred to as a pulling wire 10.

  Further, the proximal end of the pulling wire 10 is fixed to the inner wall of the operation unit 5 via a spring 69 for removing looseness.

  Further, a conical member 43 as an engaged portion is provided at a position between the driving member 61 and the bending portion 4 in the pulling wire 10. In addition, the conical member 43 is formed in the direction which has a vertex on the curved part 4 side along the pulling wire 10, for example, is comprised from three.

  In addition, a loosening suspension spring 64 and a ring 30 fixed to the inner wall of the operation portion 5 are provided at a position between the conical member 43 and the bending portion 4 in the pulling wire 10.

  As shown in FIG. 17, when the engaging portion 41 s of the L-shaped member 41 is engaged with the bottom portion 43 t of the conical member 43, the backward movement of the conical member 43 is engaged with the engaging portion 41 s of the L-shaped member 41. Therefore, application of traction force from the drive member 61 to the traction wire 10 is prevented.

  The L-shaped member 41 is a press releasing member in which a distal end 66s as an extending end is fixed in the vicinity of the rotary shaft 67 around the rotary shaft 67 on the end portion side opposite to the engaging portion 41s. The press release wire 66 can be rotated by pulling and loosening. Note that the proximal end of the pressing release wire 66 is connected to the joystick 8.

  Therefore, when the joystick 8 is not operated and the press release wire 66 is not pulled, the press release wire 66 is loose, and the engaging portion 41 s of the L-shaped member 41 contacts the bottom portion 43 t of the conical member 43. Stays in contact.

  A spring 68 fixed to the inner wall of the operation unit 5 is connected to the base end of the L-shaped member 41. Further, a pressing portion 41 p that presses the pulling wire 10 against the pulley 65 is formed at the base end of the L-shaped member 41.

  As shown in FIG. 18, the pressing portion 41 p presses the pulling wire 10 against the pulley 65 against the spring 68 when the pressing release wire 66 is pulled by an input operation of the joystick 8. Therefore, when the joystick 8 is not operated, the pressing portion 41 p is positioned away from the pulling wire 10 by the spring 68.

  From the above, in the present embodiment, the L-shaped member 41 serves as both a stopper and a driving member. In addition, since the other structure is the same as the L-shaped member 41 shown in FIGS. 6-8, the description is abbreviate | omitted.

Next, the operation of the present embodiment will be described.
To bend the bending portion 4 using the configuration of the present embodiment, first, as shown in FIG. 18, when the joystick 8 is tilted, the loose press release wire 66 is pulled. As the press release wire 66 is pulled, the L-shaped member 41 rotates in one direction.

  As a result, the engagement of the engaging portion 41 s of the L-shaped member 41 with the bottom portion 43 t of the conical member 43 is released, and the pressing portion 41 p presses the pulling wire 10 against the pulley 65 against the spring 68.

  Therefore, the pulling wire 10 is pulled by applying the rotational force in one direction R1 of the pulley 65 to the pulling wire 10 pressed by the pressing portion 41p.

  At this time, since the restriction of the movement of the pulling wire 10 by the L-shaped member 41 is released, the pulling wire 10 can be pulled by the rotation of the pulley 65 in one direction R1, and the bending of the pulling wire 10 is fixed. Part 4 is curved.

  When the input operation of the joystick 8 is released, the press release wire 66 is loosened so that the L-shaped member 41 rotates in the other direction opposite to one direction, and the engaging portion 41s The rearward movement of the pulling wire 10 is restricted again by being fitted to the bottom 43t of 43 again. Further, the pressing portion 41 p is separated from the pulling wire 10 by the spring 68.

  Thus, in the present embodiment, when the joystick 8 is not operated, the engaging portion 41s of the L-shaped member 41 engages with the bottom portion 43t of the conical member 43 provided on the pulling wire 10, and the pressing portion It has been shown that the backward movement of the pulling wire 10 is restricted by the separation of 41p from the pulling wire 10.

  Further, as the joystick 8 is input, the pressing release wire 66 is pulled, so that the engagement of the engaging portion 41d with the bottom 43t is released, and the pressing portion 41p is pulled by the pulley 65 rotating in one direction R1. It has been shown that the pulling wire 10 is pulled by pressing the wire 10.

  According to this, only when the joystick 8 is operated, the fixing by the L-shaped member 41 is released, and the pulley 65 can be rotated in one direction R1. Therefore, when the joystick 8 is not operated, for example, the pulley 65 Even if a foreign object enters between the pressing portion 41p and the rotational force in one direction R1 of the pulley 65 is applied to the pulling wire 10 via the foreign object, the pulley 65 is There is no rotation in one direction R1.

  Therefore, it is possible to provide the endoscope 1 having a configuration that mechanically and reliably prevents the pulling wire 10 from being pulled even when the operator makes a light contact unintentionally with the joystick 8 in the non-operating state. it can.

  Hereinafter, modified examples will be described with reference to FIGS. FIG. 19 is a view showing a modified example in which the engaging member is used for the stopper of FIG. 17, and FIG. 20 is a view of the configuration of bending the bending portion of FIG. 19 and the configuration of the stopper as viewed from the IIX direction in FIG. FIG. 21 is a diagram schematically showing the bending configuration of the bending portion together with the stopper releasing configuration when the joystick of FIG. 19 is operated, and FIG. 22 shows the configuration for bending the bending portion and the stopper configuration in FIG. It is the figure seen from the IIXII direction in FIG.

  In the above-described embodiment, the L-shaped member 41 is described as serving as both a pressing member and a stopper. However, the present invention is not limited to this, and the pressing member and the stopper may be provided separately.

  Specifically, as shown in FIGS. 19 to 22, in this configuration, the driving member 71 is rotated in one direction R <b> 1 by a motor or the like (not shown) and is freely contacted with the pulling wire 10. The main part is composed of a clutch 79 which is freely rotatable.

  The clutch 79 is wound around the outer periphery at a position between the pulley 65 of the pulling wire 10 and the bending portion 4.

  The clutch 79 is pivotally supported via a spring 76 with respect to a shaft 78 fixed to the inner wall of the operation unit 5, and the clutch 79 includes a plurality of teeth 79 a that are engaged portions. Is formed.

  A receiving member 78q is provided at the extending end of the shaft 78, and a meshing member 80, which is a stopper with the other end of the spring 77 fixed at one end to the receiving member 78q, fixed to the shaft 78. On the other hand, it is provided to be movable in the axial direction J.

  The meshing member 80 has a plurality of teeth 80a, and as shown in FIG. 19, the teeth 80a are meshed with the teeth 79a by springs 76 and 77, thereby restricting the rotation of the clutch 79. Further, the engagement member 80 is connected to a distal end 73 s which is an extension end of an engagement release wire 73 which is an engagement release member provided with a spring 74 and a guide roller 75 at an intermediate position extending from the joystick 8. ing.

  The mesh release wire 73 moves the mesh member 80 along the axial direction J in a direction away from the clutch 79 against the spring 77 when pulled by an input operation of the joystick 8.

  When the joystick 8 is not operated, the teeth 80a of the engagement member 80 are engaged with the teeth 79a by the spring 77.

  Further, in this configuration, a pressing portion 8p is formed on the frame of the joystick 8, and the pressing portion 8p presses the pulling wire 10 against the pulley 65 when the joystick 8 is input.

  Other configurations are the same as those of the present embodiment shown in FIGS. 17 and 18 described above.

  Accordingly, in order to bend the bending portion 4 using the configuration of FIGS. 19 to 22, first, as shown in FIGS. 21 and 22, when the joystick 8 is tilted, the loosening mesh release wire 73 is pulled. The

  As a result, the engagement member 80 is pulled by the engagement release wire 73 and separated from the clutch 79 along the axial direction J, whereby the engagement of the teeth 80a with the teeth 79a is released. Therefore, the clutch 79 is rotatable. Further, as the joystick 8 is tilted, the pressing portion 8 p presses the pulling wire 10 against the pulley 65.

  Therefore, the pulling wire 10 is pulled by applying the rotational force in one direction R1 of the pulley 65 to the pulling wire 10 pressed by the pressing portion 8p.

  At this time, since the rotation restriction of the clutch 79 by the meshing member 80 is released, the pulling wire 10 can be pulled by the rotation of the pulley 65 in one direction R1, and the bending portion 4 to which the tip of the pulling wire 10 is fixed. Is curved.

  When the input operation of the joystick 8 is released, the engagement release wire 73 is relaxed, and the engagement member 80 is moved to the clutch 79 side along the axial direction J by the spring 74, as shown in FIG. When the tooth 80a is engaged with the tooth 79a again, the rotation of the clutch 79 is restricted again. Further, the pressing portion 8 p is separated from the pulling wire 10.

  Even with such a configuration, the same effect as that of the present embodiment described above can be obtained.

(Fourth embodiment)
FIG. 23 is a diagram schematically showing only the configuration for bending the bending portion of the insertion portion of the endoscope according to the present embodiment together with the stopper, and FIG. 24 is a stopper when the C-ring of FIG. 23 is suddenly rotated. FIG.

  The configuration of the endoscope according to the fourth embodiment is such that the stopper rotates the C-ring 22 at a set speed or higher as compared with the endoscope according to the first embodiment shown in FIGS. The difference is that it works only when it is done. Therefore, only this difference will be described, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted.

  In this embodiment, the pulling wires 10r, 10l, 10u, and 10d are collectively shown as the pulling wire 10, and the C rings 22r, 22l, 22u, and 22d of the driving member 20 are collectively shown as the C ring 22. .

  That is, the present invention can be applied to individual pulling wires and C-rings. In the C-ring 22, the C-ring 22r and the C-ring 22l are common, and the C-ring 22u and the C-ring 22d are common C-rings. It is also applicable to.

  As shown in FIGS. 23 and 24, in the present embodiment, the C ring 22 has a bottomed hole 22m along the radial direction V of the C ring 22 having an opening on the outer peripheral surface of the C ring 22. Two, for example, are formed apart from each other in the rotation direction R, and springs 83 that are stoppers and elastic members are fitted into the holes 22m so that one end is connected to the bottom of the hole 22m.

  Further, as shown in FIG. 23, a claw portion 84 that is a stopper connected to the other end of the spring 83 is positioned in each hole 22 m by the elastic force of the spring 83.

  Furthermore, a stopper member 85 that is a stopper having a stopper groove 85 a that is an engaged portion to which the claw portion 84 can be engaged is provided in the operation portion 5.

  Although the joystick 8 is not operated, the claw portion 84 has the C ring 22 connected to the outer periphery of the pulley 21 by the foreign matter 86 mixed between the outer periphery of the pulley 21 and the C ring 22 as shown in FIG. When the C-ring 22 suddenly rotates in one direction R1 at a speed higher than the set speed as a result, an abnormal frictional engagement state that suddenly bites into the direction against the elastic force of the spring 83 occurs. The rotation of the C ring 22 in one direction R1 is restricted by jumping out of the hole 22m to the outside in the radial direction V by centrifugal force and engaging with the stopper groove 85a of the stopper member 85. That is, the traction force applied from the drive member 20 to the traction wire 10 is stopped.

  In addition, as a result of the joystick 8 being tilted and the pulling wire 10 being pulled by a normal bending operation, the C-ring 22 is reduced in diameter and comes into contact with the outer periphery of the pulley 21, and the C-ring 22 together with the pulley 21 moves in one direction R <b> 1. When rotating, the claw portion 84 does not jump out of the hole 22m by centrifugal force. That is, a gap is generated between the claw portion 84 and the stopper groove 85a. Therefore, the C ring 22 can rotate in one direction R <b> 1 together with the pulley 21.

  That is, the set speed is defined as a speed that is faster than the speed at which the C-ring 22 rotates together with the pulley 21 due to the diameter of the C-ring 22 when the pulling wire 10 is pulled.

  As described above, in the present embodiment, it is shown that when the C-ring 22 is rotated at a speed higher than the set speed, the claw portion 84 jumps out of the hole 22m by the centrifugal force and is engaged with the stopper groove 85a of the stopper member 85. .

  According to this, regardless of the operation state of the joystick 8, the foreign matter 86 mixed between the outer periphery of the pulley 21 and the C ring 22 causes a frictional sliding state in which the friction between the C ring 22 and the outer periphery of the pulley 21 is large. Even if the C ring 22 suddenly rotates in one direction R1 at a speed higher than the set speed, the engagement of the claw portion 84 with the stopper groove 85a causes the rotation of the C ring 22 in one direction R1. Since it is regulated, the pulling wire 10 is not pulled by the drive member 20.

  Accordingly, it is possible to provide an endoscope 1 having a configuration that mechanically and reliably prevents the pulling wire 10 from being pulled even if the operator unintentionally touches the joystick 8 in a non-operating state. Can do.

  Hereinafter, a modification will be described with reference to FIG. FIG. 25 is a view showing a modification in which a part of the stopper is provided in the gear meshing with the C-ring in FIG.

  As shown in FIG. 25, gear teeth 22b are formed on the outer periphery of the C ring 22, and gear teeth 87a of a gear 87 rotatably supported on a rotating shaft 87c are meshed with the gear teeth 22b. Alternatively, the hole 87m may be formed along the radial direction, and the spring 83 and the claw portion 84 may be provided in the hole 87m. In this case, the stopper member 85 is provided in the operation portion 5 at a position where the stopper groove 85 a can be engaged with the claw portion 84.

  Even in such a configuration, the foreign matter 86 mixed between the outer periphery of the pulley 21 and the C ring 22 causes a frictional sliding state in which the friction between the C ring 22 and the outer periphery of the pulley 21 is large, resulting in a set speed. When the C-ring 22 suddenly rotates in one direction R1 as described above, the gear 87 in which the gear teeth 87a mesh with the gear teeth 22b also suddenly rotates in one direction R1. By jumping out of the hole 87m to the outside in the radial direction V against the force by centrifugal force and engaging with the stopper groove 85a of the stopper member 85, the one direction R1 of the C ring 22 is similar to the present embodiment. Rotation can be regulated. Other effects are the same as those of the present embodiment described above.

  Moreover, another modification is shown using FIG. FIG. 26 is a view showing a modified example in which a stopper is provided at a position different from the driving member of FIG.

  As shown in FIG. 26, a pulley 93 around which the pulling wire 10 is wound and is rotatably supported by a rotating shaft 93c is provided at a position between the bending portion 4 and the driving member 20 in the pulling wire 10. The hole 93m may be formed on the outer periphery of the pulley 93, and the spring 83 and the claw portion 84 may be provided in the hole 93m. In this case, the stopper member 85 is provided in the operation portion 5 at a position where the stopper groove 85 a can be engaged with the claw portion 84.

  That is, the spring 83, the claw portion 84, and the stopper member 85 that are stoppers may be provided at positions different from the driving member 20.

  Even in such a configuration, the foreign matter 86 mixed between the outer periphery of the pulley 21 and the C ring 22 causes a frictional sliding state in which the friction between the C ring 22 and the outer periphery of the pulley 21 is large, resulting in a set speed. When the C-ring 22 suddenly rotates in one direction R1 as described above, the pulling wire 10 is pulled by the drive member 20, so the pulley 93 also suddenly rotates in one direction R1, so that the claw portion 84 is The spring 83 protrudes from the inside of the hole 93 m to the outside in the radial direction V by the centrifugal force against the elastic force of the spring 83 and is engaged with the stopper groove 85 a of the stopper member 85.

  As a result, since the rotation of the pulley 93 in one direction R1 can be restricted, the traction of the traction wire 10 wound around the pulley 93 can be stopped. The rotation of the ring 22 in one direction R1 can be restricted. Other effects are the same as those of the present embodiment described above.

  Hereinafter, another modification will be described with reference to FIGS. 27 and 28. FIG. 27 is a view showing a modification in which a stopper is provided at a position between the bending portion and the drive member in the pulling wire of FIG. 23, and FIG. 28 shows the movement of the stopper when the C-ring of FIG. FIG.

  In the configuration shown in FIGS. 27 and 28, the stopper is an openable / closable link member 105 provided at a position between the bending portion 4 and the drive member 20 in the pulling wire 10, and the link member 105 is engageable. A main portion is configured to include a stopper member 106 having a stopper groove 106a which is a portion to be engaged and having a link member 105 provided therein.

  The link member 105 includes a sliding portion 105a provided along the pulling wire 100, a link stopper 105b provided in the middle of the insertion direction S of the sliding portion 105a, and a link stopper 105b at the sliding portion 105a. The main part includes two links 105d that are openable and closable around a rotary shaft 105c provided at the rear, an extension end of each link 105d, and a spring 105e that connects the sliding part 105a. It is configured. Normally, the link 105d is closed by a spring 105e.

  The stopper member 106 is formed with guide grooves 106m through which the sliding portion 105a can pass at positions before and after the insertion direction S.

  Although the joystick 8 is not operated, the link 105d is formed between the outer periphery of the C ring 22 and the pulley 21 by the foreign matter 86 mixed between the outer periphery of the pulley 21 and the C ring 22 as shown in FIG. When the frictional sliding state in which the friction is large and the C-ring 22 suddenly rotates in one direction R1 at a speed higher than the set speed and the pulling wire 10 is pulled, the spring 105e is resisted. By opening and engaging with the stopper groove 106a, the rotation of the C ring 22 in one direction R1 is restricted. That is, the traction force applied from the drive member 20 to the traction wire 10 is stopped.

  In addition, as a result of the joystick 8 being tilted and the pulling wire 10 being pulled by a normal bending operation, the C-ring 22 is reduced in diameter and comes into contact with the outer periphery of the pulley 21. In the case of rotation, the link 105d is not opened by the spring 105e. Therefore, the C ring 22 can rotate in one direction R <b> 1 together with the pulley 21.

  Even with such a configuration, the same effect as in the present embodiment can be obtained. The configurations shown in FIGS. 27 and 28 are also applicable to the above-described friction plate type power assist mechanism that pulls the pulling wire 10 and the above-described wire sandwiching type power assist mechanism.

  Hereinafter, another modification will be described with reference to FIGS. 29 to 31. FIG. 29 is a diagram schematically showing only the configuration for bending the bending portion of the insertion portion of the endoscope together with a stopper different from FIG. 23, and FIG. 30 is a portion of the pulley along the line IIIX-IIIX in FIG. FIG. 31 is a partial sectional view showing a state in which the claw portion protrudes from the hole of the pulley shown in FIG. 29 and is engaged with the stopper member.

  In the configuration shown in FIGS. 29 to 31, the drive member 116 that at least partially applies a traction force to the traction wire 10 by rotation with the input operation of the joystick 8 is attached to the shaft 60 fixed to the inner wall of the operation unit 5. A pulley 115 rotatably supported, a friction plate 54 provided on the inner wall side of the operation unit 5 with respect to the shaft 60 in the shaft 60, and an inner wall side of the operation unit 5 with respect to the shaft 60 from the pulley 115. A gear 56 which is a rotating member connected to a friction plate 54 provided on the motor via a spring 55, a gear 51 meshed with each gear 56, and a motor 59 which rotates each gear 51 in one direction R1. The main part is comprised.

  For each shaft 60, the pulley 115, the friction plate 54, and the gear 56 are provided coaxially. Further, the base end side of the pulling wire 10 is wound around the outer periphery of the pulley 115.

  The motor 59, the gear 51, and the gear 56 apply a rotational force in one direction R1 to the pulley 115 via the spring 55 and the friction plate 54 when the pulley 50r contacts the friction plate 54. The motor 59 is configured to always rotate in one direction R1 when the endoscope 1 is powered on.

  For example, the joystick 8 uses the frame 8w to bring the pulley 115 into contact with the friction plate 54 by pushing down the pulley 115 along the axial direction J as shown in FIG.

  Further, as shown in FIGS. 30 and 31, the pulley 115 has a bottomed hole 115m along the radial direction V of the pulley 115 having an opening on the outer peripheral surface of the pulley 115, for example, by 90 ° in the rotation direction R. Four holes are formed so as to be offset, and springs 83 that are stoppers and elastic members are fitted into the respective holes 115m so that one end thereof is connected to the bottom of the hole 115m.

  Further, as shown in FIG. 30, a claw portion 84 that is a stopper connected to the other end of the spring 83 is located in each hole 115 m by the elastic force of the spring 83.

  Further, in the operation portion 5, stopper members 110 serving as stoppers are provided corresponding to the respective claw portions 84 as well as engaged portions to which the respective claw portions 84 can be engaged. The stopper member 110 may be provided on the friction plate 54.

  The claw portion 84 has an abnormal frictional engagement in which the pulley 115 suddenly bites on the friction plate 54 due to foreign matter mixed between the frame 8w and the pulley 115, although the joystick 8 is not operated. As a result, when the pulley 115 suddenly rotates in one direction R1 at a speed higher than the set speed, centrifugal force is generated from the inside of the hole 115m to the outside in the radial direction V against the elastic force of the spring 83. By jumping out and engaging with the stopper member 110, the rotation of the pulley 115 in one direction R1 is restricted. That is, the traction force applied from the drive member 116 to the traction wire 10 is stopped.

  Note that when the pulley 21 rotates in one direction R1 as a result of the joystick 8 being tilted and the pulling wire 10 being pulled by a normal bending operation, the claw portion 84 jumps out of the hole 115m by centrifugal force. There is no. That is, a gap is generated between the claw portion 84 and the stopper member 110.

  That is, the set speed in FIGS. 29 to 31 is defined as a speed faster than the speed at which the pulley 110 is rotated by the friction plate 54.

  Even in such a configuration, the same effect as that of the present embodiment described above can be obtained.

  Hereinafter, another modification will be described with reference to FIG. FIG. 32 is a diagram schematically showing only the configuration for bending the bending portion of the insertion portion of the endoscope, together with a stopper different from FIGS. 23 and 29.

  In the configuration shown in FIG. 32, the driving member 120 that applies at least a traction force to the traction wire 10 by rotation with the input operation of the joystick 8 ′ that is an operation member is driven by the endoscope 1 by a motor or the like (not shown). The pulley 121 is configured to always rotate in one direction R1 when the power is turned on, and the pulling wire 10 is pressed against the pulley 121 provided on the joystick 8 and the pulley 121 whose middle position is freely contactable with the outer periphery. The main part is comprised from the press roller 122 which is a member. In the configuration shown in FIG. 32, the proximal end of the pulling wire 10 is connected to the inner wall of the operation unit 5 via a loosening spring 69.

  The pressing roller 122 is rotatable with respect to the end portion of the shaft portion 8v of the joystick 8 ′ via the rotation shaft 126, and the pulling wire 10 is attached to the pulley 121 as the joystick 8 is tilted. Press.

  For example, three bottomed holes 122m along the radial direction of the pressure roller 122 having an opening on the outer peripheral surface of the pressure roller 122 are formed in the pressure roller 122, and one end of each hole 122m has a hole 122m. A spring 83 which is a stopper and is an elastic member is fitted into each bottom so as to be connected to the bottom of each.

  A claw portion 84 that is a stopper connected to the other end of the spring 83 is positioned in each hole 122 m by the elastic force of the spring 83.

  Further, the joystick 8 'is provided with a stopper portion 8s that is an engaged portion as well as a stopper member branched from the shaft portion 8v, in which each claw portion 84 can be engaged.

  The claw portion 84 has an abnormal friction in which the pulley 121 suddenly bites on the pulling wire 10 due to foreign matter or the like mixed between the pulling wire 10 and the pulley 121 even though the joystick 8 ′ is not operated. When the pulley 121 suddenly rotates in one direction R1 above the set speed as a result of being engaged, a centrifugal force is exerted radially outward from the hole 122m against the elastic force of the spring 83. And the rotation of the pulley 121 in one direction R1 is restricted by engaging with the stopper portion 8s. That is, the traction force applied from the drive member 120 to the traction wire 10 is stopped.

  When the joystick 8 'is tilted by a normal bending operation and the pulling wire 10 is pulled against the pulley 121 by the pressing roller 122 and the pulling wire 10 is pulled, the pulley 21 rotates in one direction R1. The claw portion 84 does not jump out of the hole 122m by centrifugal force. In other words, a gap is generated between the claw portion 84 and the stopper portion 8s.

  That is, the set speed in FIG. 32 is defined as a speed faster than the speed at which the pressing roller 122 rotates by the pulley 121.

  Even in such a configuration, the same effect as that of the present embodiment described above can be obtained.

(Fifth embodiment)
FIG. 33 schematically shows only the configuration of the drive unit in the endoscope of the present embodiment, together with the stopper, and FIG. 34 schematically shows the stopper movement when the C-ring of FIG. 33 rotates rapidly. FIG.

  The configuration of the endoscope according to the fifth embodiment is different in the configuration of the stopper from the endoscope according to the fourth embodiment shown in FIGS. Therefore, only this difference will be described, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted.

  In this embodiment, the pulling wires 10r, 10l, 10u, and 10d are collectively shown as the pulling wire 10, and the C rings 22r, 22l, 22u, and 22d are collectively shown as the C ring 22.

  That is, the present invention can be applied to individual pulling wires and C-rings. In the C-ring 22, the C-ring 22r and the C-ring 22l are common, and the C-ring 22u and the C-ring 22d are common C-rings. It is also applicable to.

  As shown in FIGS. 33 and 34, in the C-ring 22 of the present embodiment, a notch 160 having a predetermined length along the rotation direction R is formed in the vicinity of the end 22i. A part of the stopper is provided in the notch.

  Specifically, in the C ring 22, the stopper is pivotally supported by a shaft 141b extending from the one direction R1 side of the notch 160 into the notch 160 so as to be rotatable via the rotation shaft 141c. In the first roller 141 and the C ring 22, the shaft 142 b that extends into the notch 160 from the other direction R 2 side of the notch 160 contacts the first roller 141 to rotate together with the first roller 141. The second roller 142 pivotally supported via a movable rotating shaft 142c and the second roller 142 provided on the second roller 142 move in one direction R1 along with the rotation in one direction R1. When the second roller 142 is stopped when the second roller 142 is stopped, one end is connected to the portion where the claw portion 145 and the shaft 142b of the C ring 22 are connected, and the other direction R2 Move to And includes a spring 143 is an elastic member which.

  In addition, a plurality of engaging grooves 130a, which are engaged portions, are formed in a part of the outer periphery covering at least the notch 160 of the C ring 22 at positions facing the claw portions 145, and the claw portions 145 are freely engageable. A stopper member 130 which is a simple stopper is provided.

Next, the operation of the present embodiment will be described.
Although the joystick 8 is not operated, the C ring 22 suddenly bites the outer periphery of the pulley 21 due to the foreign matter 86 mixed between the outer periphery of the pulley 21 and the C ring 22 as shown in FIG. As a result, when the C-ring 22 suddenly rotates in one direction R1 at a set speed or higher, the first roller 141 comes into contact with the outer periphery of the pulley 21. The resulting rotation of the first roller 141 and the second roller 142 in one direction R1 is stopped.

  As a result, the claw portion 145 moves in the other direction R2 by the elastic force of the spring 143 and engages with the engagement groove 130a of the stopper member 130, so that the rotation of the C ring 22 in one direction R1 is performed. Be regulated. That is, the traction force applied from the drive member 20 to the traction wire 10 is stopped.

  In addition, as a result of the joystick 8 being tilted and the pulling wire 10 being pulled by a normal bending operation, the C-ring 22 is reduced in diameter and comes into contact with the outer periphery of the pulley 21. When rotating, the claw portion 145 does not move in the other direction R2 by the elastic force of the spring 143.

  That is, the set speed is defined as a speed that is faster than the speed at which the C ring rotates together with the pulley 21 due to the diameter of the C ring 22 as the pulling wire 10 is pulled.

  Thus, in the present embodiment, when the C-ring 22 rotates in one direction R1 at a speed higher than the set speed, the claw portion 144 moves in the other direction R2 by the elastic force of the spring 143, and the engagement groove of the stopper member 130 130a is shown engaged.

  According to this, regardless of the operation state of the joystick 8, the foreign matter 86 mixed between the outer periphery of the pulley 21 and the C ring 22 causes a frictional sliding state in which the friction between the C ring 22 and the outer periphery of the pulley 21 is large. Even if the C-ring 22 suddenly rotates in one direction R1 at a speed higher than the set speed, the C-ring 22 rotates in one direction R1 due to the engagement of the claw portion 144 with the engaging groove 130a. Therefore, the pulling wire 10 is not pulled by the drive member 20.

  Accordingly, it is possible to provide an endoscope 1 having a configuration that mechanically and reliably prevents the pulling wire 10 from being pulled even if the operator unintentionally touches the joystick 8 in a non-operating state. Can do.

  In the first to fifth embodiments described above, the operation member has been described by taking a joystick as an example. However, the operation member is not limited to this and may be a knob or a trackball.

  Further, in the first to fifth embodiments described above, the configuration in which the bending portion of the insertion portion of the endoscope is bent is shown as an example. However, the configuration is not limited thereto, and a guide tube and an observation unit are provided. It is applicable to other insertion devices such as various treatment tools and manipulators.

DESCRIPTION OF SYMBOLS 1 ... Endoscope 2 ... Insertion part 4 ... Bending part 5 ... Operation part 8 ... Joystick (operation member)
8r, 8l, 8u, 8d ... joystick frame 8s ... Stopper (stopper) (engaged part)
8 '... Joystick (operating member)
10 (10r, 10l, 10u, 10d) ... pulling wire (traction member)
20 ... Drive member 21 ... Pulley 22 (22r, 22l, 22u, 22d) ... C-ring (friction engagement member)
22a: Stopper groove (engaged part)
22b ... Gear groove (engaged part)
22m ... hole 25 ... slider (stopper)
28: Fixing release wire (fixing release member)
28 s ... tip of the release wire (extension end)
33 ... Gear (stopper)
41 ... L-shaped member (stopper) (pressing member)
43 ... Conical member (engaged part)
45 ... Guide member 46 ... Gear (stopper)
50r, 50l, 50u, 50d ... pulley 50ra, 50la, 50ua, 50da ... gear teeth (engaged part)
52 ... Gear (stopper)
54 ... friction plate 56 ... gear (rotating member)
58 ... Drive member 61 ... Drive member 65 ... Pulley 66 ... Press release wire (Press release member)
66s ... Tip of the release wire (extended end)
71 ... Drive member 73 ... Mesh release wire (mesh release member)
73s ... Tip of the mesh release wire (extended end)
79 ... Clutch 79a ... Tooth (engaged part)
80 ... meshing member (stopper)
83 ... Spring (stopper) (elastic member)
84 ... Claw (stopper)
85: Stopper member (stopper)
85a ... Stopper groove (engaged part)
105 ... Link member (stopper)
106 ... stopper member (stopper)
106a: Stopper groove (engaged part)
110: Stopper member (stopper) (engaged part)
115 ... pulley 115m ... hole 116 ... driving member 120 ... driving member 121 ... pulley 122 ... pressing roller (pressing member)
122m ... hole 130 ... stopper member (stopper)
130a ... engaging groove (engaged portion)
141: First roller (stopper)
142 ... Second roller (stopper)
143 ... Spring (stopper) (elastic member)
145 ... Claw (stopper)
J: Axial direction S: Insertion direction R1: One direction

Claims (16)

An endoscope provided with an insertion portion to be inserted into a subject and provided with a bending portion that bends in a plurality of directions in the insertion portion,
A traction member that is inserted into the insertion portion and that bends the bending portion by traction;
An operation member that is provided in an operation unit at a proximal end in the insertion direction of the insertion unit and that inputs a traction operation of the traction member;
A drive member provided in the operation portion, and at least a part of the drive member for applying a pulling assisting force to the pulling member in accordance with an input operation of the operation member;
A stopper provided in the operation portion, which stops the traction assist force applied from the drive member to the traction member when the operation member is not operated;
Comprising
The endoscope, wherein the driving member rotates when the stop by the stopper is released by an input operation of the operating member, and applies the pulling assisting force to the pulling member. The proximal end of the pulling member in the insertion direction is connected to the operation member,
The drive member includes a pulley that rotates in one direction, and a friction engagement member that is freely contactable with the pulley on an outer periphery of the pulley and in which an intermediate position in the insertion direction of the traction member is wound around the outer periphery. And
When the pulling member is pulled by the input operation of the operation member, the friction engagement member contacts the pulley with a frictional force and rotates in the one direction together with the pulley. The endoscope according to claim 1, wherein the pulling assist force is applied to the endoscope. From the position between the friction engagement member and the operation member in the insertion direction of the pulling member, a fixing release member having an extended end connected to the stopper is extended, and the stopper is Engaged with an engaged portion formed on the friction engagement member to restrict rotation of the friction engagement member;
When the pulling member is pulled by the input operation of the operating member, the fixing release member is pulled, and the stopper is detached from the engaged portion, so that the friction engagement member is moved in the one direction. The endoscope according to claim 2, wherein the endoscope rotates. From the position between the friction engagement member and the operation member in the insertion direction of the pulling member, a fixing release member having an extended end connected to the stopper is extended, and the stopper is It is freely engageable with an engaged portion provided at a position between the friction engagement member and the bending portion in the insertion direction of the traction member,
When the pulling member is pulled by the input operation of the operating member, the fixing release member is pulled, and the stopper is detached from the engaged portion, so that the friction engagement member is moved in the one direction. The endoscope according to claim 2, wherein the endoscope rotates. A guide member in which the traction member is wound around the outer periphery at a position between the friction engagement member and the operation member in the insertion direction of the traction member is provided coaxially with the stopper, and The stopper is engaged with an engaged portion formed on the friction engagement member to stop the rotation of the friction engagement member.
When the pulling member is pulled by the input operation of the operating member, the guide member is moved in the axial direction, and the stopper pressed by the guide member is disengaged from the engaged portion. The endoscope according to claim 2, wherein the friction engagement member rotates in the one direction. The drive member includes a pulley having a midway position in the insertion direction of the traction member wound around an outer periphery, a friction plate provided coaxially with the pulley, and the friction provided coaxially with the friction plate. A rotation member that applies a rotational force in one direction to the pulley via a plate, and the stopper that stops the rotation of the pulley at an engaged portion formed on the outer periphery of the pulley. Engaged,
The pulley or the stopper is moved in the axial direction by the frame of the operation member by the input operation of the operation member, and when the stopper is detached from the engaged portion, the pulley is rotated by the rotational force of the rotation member. The endoscope according to claim 1, wherein the endoscope rotates in the one direction by being applied through the friction plate. The driving member is connected to the pulley, the pulley having a midway position in the insertion direction of the traction member in contact with the outer periphery, and the extension end of a press release member extending from the operation member. The stopper is formed on the pressing member, and the stopper is provided at a position between the friction engagement member and the bending portion in the insertion direction of the traction member. Is freely engageable with the engaged part,
As the pressing release member is pulled by the input operation of the operating member, the stopper is detached from the engaged portion, and the pressing member presses the pulling member against the pulley, thereby The endoscope according to claim 1, wherein a rotational force is applied to the pulling member. The drive member is wound around the outer periphery of a pulley whose midway position in the insertion direction of the pulling member contacts the outer periphery, and the pulling member provided between the pulley and the bending portion in the insertion direction. A rotatable clutch,
The stopper is provided coaxially with the clutch and connected to an extended end of a mesh release member extended from the operation member, and is engaged with an engaged portion of the clutch to stop the rotation of the clutch. And
As the mesh release member is pulled by the input operation of the operation member, the stopper moves in the axial direction and is disengaged from the engaged portion, so that the clutch is rotatable, and the operation member is moved to the pulley. The endoscope according to claim 1, wherein a rotational force of the pulley is applied to the pulling member by pressing the pulling member. An endoscope provided with an insertion portion to be inserted into a subject and provided with a bending portion that bends in a plurality of directions in the insertion portion,
A traction member that is inserted into the insertion portion and that bends the bending portion by traction;
An operation member that is provided in an operation unit at a proximal end in the insertion direction of the insertion unit and that inputs a traction operation of the traction member;
A drive member provided in the operation portion, and at least a part of the drive member for applying a pulling assisting force to the pulling member in accordance with an input operation of the operation member;
A stopper provided in the operation portion, which stops the traction assist force applied from the drive member to the traction member when the drive member is rotated at a set speed or higher;
An endoscope characterized by comprising: The proximal end of the pulling member in the insertion direction is connected to the operation member,
The drive member includes a pulley that rotates in one direction, and a friction engagement member that is freely contactable with the pulley on an outer periphery of the pulley and in which an intermediate position in the insertion direction of the traction member is wound around the outer periphery. And
When the pulling member is pulled by the input operation of the operation member, the friction engagement member contacts the pulley with a frictional force and rotates in the one direction together with the pulley. The endoscope according to claim 9, wherein the pulling assist force is applied to the endoscope. The stopper includes an elastic member fitted in the hole of the friction engagement member, a claw portion positioned in the hole by the elastic force of the elastic member connected to the elastic member, and the claw provided in the operation portion An engaged portion with which the portion is freely engageable,
When the friction engagement member is rotated at a speed equal to or higher than the set speed, the claw portion protrudes from the hole by centrifugal force against the elastic force and engages with the engaged portion. The endoscope according to claim 10, wherein the rotation of the engaging member in the one direction is stopped. The stopper includes an openable / closable link member provided between the friction engagement member and the curved portion of the pulling member, and the link member provided in the operation portion is engageable inside. An engaged portion provided with a link member,
The link member is opened when the friction engagement member is rotated at the set speed or more, and is engaged with the engaged portion to stop the rotation of the friction engagement member in the one direction. The endoscope according to claim 10, wherein the endoscope is provided. The drive member includes a pulley having a midway position in the insertion direction of the traction member wound around an outer periphery, a friction plate provided coaxially with the pulley, and the friction provided coaxially with the friction plate. A rotating member that applies a rotational force in one direction to the pulley via a plate;
The stopper includes an elastic member inserted into the hole of the pulley, a claw portion positioned in the hole by the elastic force of the elastic member connected to the elastic member, and the claw portion provided in the operation portion. A freely engaged portion,
When the pulley is rotated at a speed equal to or higher than the set speed, the claw portion pops out of the hole by centrifugal force against the elastic force and engages with the engaged portion, thereby the one of the pulleys. The endoscope according to claim 9, wherein the rotation in the direction is stopped. The drive member includes a pulley that can freely contact an intermediate position in the insertion direction of the traction member on an outer periphery, and a pressing member that presses the traction member against the pulley provided in the operation member,
The stopper includes an elastic member inserted into the hole of the pressing member, a claw portion positioned in the hole by the elastic force of the elastic member connected to the elastic member, and the claw portion provided on the operation member. An engaged portion that is freely engageable,
When the pressing member is rotated at the set speed or more by contact with the pulley, the claw portion protrudes from the hole by centrifugal force against the elastic force and engages the engaged portion. The endoscope according to claim 9, wherein rotation of the pulley and the pressing member in one direction is stopped. The stopper is in contact with the first roller provided on the friction engagement member and rotatable with the pulley, and the first roller provided on the friction engagement member. And one end connected to the friction engagement member, a second roller that can rotate freely, a claw portion that rotates in one direction by rotation of the second roller provided in the second roller, and the friction engagement member. An elastic member connected to the claw portion at the other end, and when the rotation of the second roller in the one direction is stopped, the elastic member moves the claw portion in the other direction opposite to the one direction; An engaged portion with which the claw portion provided in the operation portion can be freely engaged;
When the friction engagement member is rotated at a speed equal to or higher than the set speed, rotation of the first roller and the second roller in the one direction is stopped, so that the claw portion The rotation in the one direction of the friction engagement member is stopped by moving in the other direction by the elastic force and engaging with the engaged portion. The endoscope described. A medical device having an insertion portion to be inserted into a subject and provided with a bending portion that is curved in a plurality of directions in the insertion portion,
A traction member that is inserted into the insertion portion and that bends the bending portion by traction;
An operation member that is provided in an operation unit at a proximal end in the insertion direction of the insertion unit and that inputs a traction operation of the traction member;
A drive member provided in the operation portion, and at least a part of the drive member for applying a pulling assisting force to the pulling member in accordance with an input operation of the operation member;
A stopper provided in the operation portion, which stops the traction assist force applied from the drive member to the traction member when the operation member is not operated;
Comprising
The medical device according to claim 1, wherein the driving member rotates when the stop by the stopper is released by an input operation of the operating member, and applies the pulling assisting force to the pulling member.

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