JP2012040115A - Bend shape holding operation device for body-cavity insertion tubes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bend shape holding operation device for body-cavity insertion tubes, allowing, by one rotation operation member, easy performance of both an operation to hold a bent shape by simultaneously pulling a pair of operation wires of a bendable part, and an operation to pull one of the pair of operation wires, to send out the other, and to bend the bendable part by remote control.SOLUTION: An intermediate base 17 rotatably installed with an intermediate small gear 23 meshing with both gears 21, 22 respectively integrally provided in a pair of wire winding drums 11, 12 is disposed between the pair of wire winding drums 11, 12 rotatably in a direction around the axis, while a drum rotation operation axis 18 is connected to the first wire winding drum 11, and an intermediate base rotation operation axis 19 is connected to the intermediate base 17.

Description

  The present invention relates to an endoscope guide tube device used as a guide at the time of insertion of an endoscope, an endoscope itself or a bending shape maintaining operation device for a body cavity insertion tube such as an endoscope treatment tool.

  In general, an endoscope is provided with a bending portion that can be arbitrarily bent by a remote operation in a region on a distal end side of an insertion tube to be inserted into a body cavity. Some endoscope treatment tools that are used by being inserted into a treatment tool insertion channel of an endoscope have such a function.

  In recent years, the insertion part of a flexible endoscope can be inserted freely. The shape of the insertion part of the flexible endoscope is passively changed in accordance with the change of the shape, and the shape is arbitrarily fixed. An endoscope guide tube device has been developed that includes a bendable portion that can be bent in a region on the distal end side of the insertion tube. Some endoscopes and endoscope treatment tools have similar bendable parts (for example, Patent Documents 1, 2, and 3).

JP2009-112536A JP2009-112537 JP2009-112538A

  The configuration of the bendable portion of the invention described in Patent Documents 1 to 3 and the like is basically the same as the configuration of the bending portion of a general endoscope, but the paired operation wires are strongly pulled simultaneously. Then, the frictional resistance between the wire guide provided in the bendable part and the operation wire becomes very large, and the bent shape of the bendable part is maintained.

  On the other hand, in the bending portion of a general endoscope, the frictional resistance between the wire guide provided in the bending portion and the operation wire is made as small as possible, and one of the paired operation wires is pulled to the other. By performing the operation of feeding out the bending portion, the bending portion is bent in a direction corresponding to the pulled operation wire.

  Therefore, in the case of the bendable part, not only the operation of strongly pulling the pair of operation wires at the same time but also the operation of pulling one of the pair of operation wires and sending out the other can be performed. There are cases where it is very easy to use if it can be bent with will. For example, the bendable part can be easily guided to a target position in the body cavity, and the bent shape of the bendable part can be finely adjusted after the guide.

  In order to realize such usage, the present invention pulls the operation wires forming a pair of bendable parts at the same time to hold the bent shape, and pulls one of the paired operation wires and sends out the other. An object of the present invention is to provide a bending shape maintaining operation device for a body cavity insertion tube that can be easily operated by a single rotation operation member to bend the bendable portion by remote operation.

  In order to achieve the above object, the bending shape holding operation device for insertion tubes in a body cavity of the present invention has a bending shape of a bendable portion provided on the distal end side of a flexible tube portion inserted into a body cavity. The operation wire that is formed is held by simultaneously pulling the operation wire from the operation portion side provided on the rear end side of the flexible tube portion and increasing the tension of both operation wires. In the bending shape holding operation device for the body cavity insertion tube configured such that the bendable portion bends in the direction corresponding to the pulled operation wire by sending out the distal end to the distal end side. A second pair of wire take-up drums are rotatably arranged coaxially, and a portion of the rear end side of the pair of operation wires, one is the first wire take-up drum and the other is the second wire take-up drum. Flexible by winding around the take-up drum in the opposite direction An intermediate small gear that is pulled out toward the section and is integrally provided with a pair of wire take-up drums around the axis and meshes with both of the gears provided on the pair of wire take-up drums. An intermediate base on which the shaft is rotatably mounted is rotatably disposed between the pair of wire winding drums in the direction around the axis, and the drum rotating operation shaft is connected to the first wire winding drum, An intermediate base rotation operating shaft is coupled to the base, and the first and second wire winding drums are axially rotated by integrally rotating the drum rotation operating shaft and the intermediate base rotation operating shaft. One of the pair of operation wires that rotate integrally in the surrounding direction is pulled, and at the same time, the other is sent to the tip side, the bendable part is bent, the intermediate base rotation operation shaft is fixed, and the drum rotation operation shaft is fixed. Only times By operating, both the first wire take-up drum and the second wire take-up drum rotate in the opposite directions in the direction around the axis and the paired operation wires are pulled together or sent to the tip side. The bent shape of the bendable part is held / released.

  An operation for rotating the drum rotation operation shaft and the intermediate substrate rotation operation shaft integrally and an operation for fixing the intermediate substrate rotation operation shaft and rotating only the drum rotation operation shaft are performed by one rotation operation member. In order to achieve this, a shaft connection switching mechanism for switching the connection state of the drum rotation operation shaft and the intermediate base rotation operation shaft with respect to the rotation operation member may be provided in the operation unit.

  According to the present invention, the intermediate base on which the intermediate small gear meshing with both of the gears integrally provided on the pair of wire winding drums is rotatably mounted is arranged around the axis between the pair of wire winding drums. Since the operation wires forming a pair of bendable parts are simultaneously pulled to maintain a bent shape, and one of the paired operation wires is pulled and the other is sent out remotely The operation of bending the bendable portion by the operation can be easily performed with one rotating operation member.

It is a partial expanded side half sectional view of the bending shape maintenance operation device of the insertion tube in a body cavity concerning the example of the present invention. It is II-II sectional drawing in FIG. 1 of the bending shape holding | maintenance operating device of the body cavity insertion pipe | tube concerning the Example of this invention. 1 is an external view of an endoscope guide tube device to which the present invention is applied. It is side surface sectional drawing of the bending shape holding | maintenance operating device of the body cavity insertion pipe | tube concerning the Example of this invention. It is a fragmentary perspective view of the bending shape holding | maintenance operating device of the body cavity insertion pipe | tube concerning the Example of this invention. It is a side view which abbreviate | omits and shows a part of bending shape holding | maintenance operating device of the body cavity insertion pipe | tube concerning the Example of this invention. It is a partial exploded perspective view of the bending shape holding | maintenance operating device of the body cavity insertion pipe | tube concerning the Example of this invention. It is side surface sectional drawing of the bending operation state in the bending shape holding | maintenance operating device of the body cavity insertion pipe | tube concerning the Example of this invention. It is a side view which abbreviate | omits and shows a part of bending operation state in the bending shape holding | maintenance operating device of the body cavity insertion pipe | tube concerning the Example of this invention. It is side surface sectional drawing of the shape holding | maintenance operation state in the bending shape holding | maintenance operating device of the body cavity insertion pipe | tube concerning the Example of this invention. It is a side view which abbreviate | omits and shows a part of shape holding | maintenance operation state in the bending shape holding | maintenance operating device of the body cavity insertion pipe | tube concerning the Example of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 3 shows an endoscope guide tube device that can be inserted through the insertion portion of the flexible endoscope.
The insertion portion to be inserted into the body cavity is configured by connecting the bendable portion 2 in series to the distal end of the flexible tube portion 1. Both the flexible tube portion 1 and the bendable portion 2 can be bent by applying an external force, but the bendable portion 2 is easily bent to a small radius of curvature with a smaller force than the flexible tube portion 1. There is a big difference in that it can be made.

  The structure of the tube part which comprises the flexible tube part 1 is the same as that of the flexible tube part of a general endoscope, for example, the outer periphery of the helical tube formed by spirally winding a metal strip with a fixed diameter A mesh tube is coated on the outer periphery, and an outer skin is coated on the outer periphery by extrusion molding or the like. However, other configurations may be used.

  The configuration of the tube portion constituting the bendable portion 2 is basically the same as that of a curved portion of a known endoscope. For example, a large number of articulated rings connected in series so as to be relatively rotatable. A net-like tube is coated on the outer periphery, and a rubber tube or the like is coated on the outer periphery.

  And since it is the same as the known invention described in Patent Document 1 and the like, the illustration thereof is omitted, but the wire guide for guiding the operation wire is not straight but is formed in, for example, a wavy shape, The operation wire passes loosely therethrough (however, other configurations may be used).

  As a result, for example, if the operation wires (not shown) arranged at 180 ° symmetrical positions so as to form a pair are in a free state in which they can advance and retreat, the bendable portion 2 is passively bent by an external force, When the operation wire forming the position is pulled strongly together from the rear and the tension is increased, a large frictional resistance is generated between the operation wire and each wire guide, and the bending shape of the bendable portion 2 (for example, (S-shape) is maintained as it is.

  Note that in the case of a curved portion of a general endoscope, since an extremely large frictional resistance is not generated between the operation wire and each wire guide, for example, even when trying to maintain an S-shaped bent shape, It is easily deformed into a J shape or an I shape.

  On the other hand, in the bendable part 2, not only the overall bending angle but also the bending angle in the partial part is maintained, so that the general bending shape is maintained without being broken. Different from the curved part of the mirror.

  However, if one of the paired operation wires is pulled from the proximal end side and the other is sent to the distal end side, it bends in the direction corresponding to the pulled operation wire, similar to the bending portion of a general endoscope. The flexible part 2 bends.

  In the insertion sections 1 and 2, an endoscope guide pipe 3 for passing an insertion section of an endoscope (not shown) is inserted and arranged over the entire length. Therefore, when the bending portion of the endoscope is bent inside the bendable portion 2 in a free state, the bendable portion 2 is bent into the same shape as the bending shape of the bending portion. The entrance opening 3 a of the endoscope guide conduit 3 is formed on the rear end surface of the operation portion 4 connected to the rear end of the flexible tube portion 1, and the outlet opening 3 b is formed on the most distal surface of the bendable portion 2. ing.

  A pair (that is, two) of operation wires not shown in FIG. 3 has their tips fixed to the tip of the bendable portion 2 at intervals of 180 °, for example. Correspondingly, the above-described wire guides are provided in the bendable part 2 at intervals of 180 °. And the operation knob 5 (rotation operation member) for pushing and pulling such an operation wire is provided in the operation part 4 so that it can rotate manually.

  FIG. 4 is a side sectional view of a mechanism provided in the operation unit 4 for operating the operation wires 13 and 14 paired with the operation knob 5, and FIG. 5 is a partial perspective view thereof. The mechanism is attached to a frame 6 that is fixedly arranged in the operation unit 4.

  Reference numeral 7 shown in FIG. 4 is a fixed shaft erected on the frame 6, and the first wire take-up drum 11 and the second wire take-up drum 12 are arranged coaxially so as to be rotatable around the axis. Has been. In this embodiment, the spiral groove for winding the operation wires 13 and 14 is formed on the outer periphery of each of the wire take-up drums 11 and 12, but it may be a single groove or the like. .

  Of the pair of operation wires 13 and 14, the rear end portion of one operation wire 13 is wound around the first wire winding drum 11, and the rear end side of the other operation wire 14 in the opposite direction. Is wound around the second wire winding drum 12, and the two operation wires 13 and 14 are drawn out toward the flexible tube portion 1.

  A drum cover 15 is fixedly attached to the frame 6 so as to surround the wire winding drums 11 and 12 so that the operation wires 13 and 14 are not detached from the outer peripheral portions of the wire winding drums 11 and 12. As shown in FIG. 5, the operation wires 13 and 14 are drawn out from the slit portion 16 formed on the side surface of the drum cover 15.

  As shown in FIG. 1 and FIG. 2 which is a sectional view taken along the line II-II, the pair of wire take-up drums 11 and 12 are integrally provided with gears 21 and 22 centering on the axis. ing. The gears 21 and 22 of this embodiment are both bevel gears and rotate in the direction around the axis along with the wire winding drums 11 and 12.

  Further, a disk-shaped intermediate base 17 is disposed between the pair of wire take-up drums 11 and 12 so as to be rotatable around the axis with a slight gap between the wire take-up drums 11 and 12. Has been.

  For example, three intermediate small gears 23 made of small bevel gears that mesh with both the gears 21 and 22 provided on the pair of wire winding drums 11 and 12 are rotatably attached to the intermediate base 17. Reference numeral 24 denotes a rotation support shaft of the intermediate small gear 23. A planetary gear mechanism or the like may be used instead of such a gear mechanism.

  Further, a drum rotating operation shaft 18 is connected to the first wire take-up drum 11 so as to rotate integrally with the first wire take-up drum 11 in the direction around the axis, and the intermediate substrate 17 is rotated to the intermediate substrate. The operation shaft 19 is coupled to the intermediate base 17 so as to rotate in the direction around the axis.

  The drum rotation operation shaft 18 and the intermediate base rotation operation shaft 19 are arranged coaxially so as to surround the fixed shaft 7, and their projecting ends project outside the operation unit 4. The shaft is not connected to the second wire winding drum 12, and the rotation operation of the second wire winding drum 12 is restricted by the intermediate small gear 23.

  With such a configuration, when the drum rotation operation shaft 18 and the intermediate base rotation operation shaft 19 are integrally rotated, the intermediate small gear 23 is locked. Thereby, the first wire winding drum 11 and the second wire winding drum 12 are integrally rotated in the direction around the axis, and one of the paired operation wires 13 and 14 is pulled and the other at the same time. Is sent to the distal end side, and the bendable portion 2 bends in the same manner as the bending portion of a general endoscope.

  When the intermediate base rotation operation shaft 19 is fixed and only the drum rotation operation shaft 18 is rotated, the rotation of the first gear 21 is transmitted to the second gear 22 via the intermediate small gear 23. As a result, the first wire winding drum 11 and the second wire winding drum 12 rotate in the opposite directions in the direction around the axis, and both of the paired operation wires 13 and 14 are pulled together or on the distal end side. The bent shape of the bendable part 2 is held / released.

  Returning to FIGS. 4 and 5, as described above, the drum rotation operation shaft 18 and the intermediate base rotation operation shaft 19 are integrally rotated, and the intermediate base rotation operation shaft 19 is fixed and the drum rotation operation shaft 18 is fixed. The shaft connection switching mechanism 30 for switching the connection state of the drum rotation operation shaft 18 and the intermediate base rotation operation shaft 19 with respect to the operation knob 5 so that the operation of rotating only the operation knob 5 can be operated with one operation knob 5. Is provided in the operation knob 5.

  In addition, about the shaft connection switching mechanism 30, only the structure and operation | movement of the part which exhibits a main function are demonstrated, and description is abbreviate | omitted about the structure of a design detail. For example, the structure of the connecting portion that is relatively movable in the axial direction and cannot be relatively rotated in the direction around the axial line can be obtained by fitting the square shaft and the square hole.

  The drum rotation operation shaft 18 is in a state where the first wire winding drum 11 and the operation knob 5 are always connected. Therefore, if the operation knob 5 is rotated, the drum rotation operation shaft 18 is rotated together with the operation knob 5, and the first wire winding drum 11 and the first gear 21 are rotated in the direction around the axis.

  The intermediate base rotation operating shaft 19 is always connected to the intermediate base 17, and an intermediate base interlocking panel 32 is integrated with the other end of the intermediate base rotary operating shaft 19 located inside the operation knob 5. Connected.

  Reference numerals 34 and 35 denote a pair of cam disks disposed in the operation knob 5 so as to rotate integrally with the operation knob 5 in the direction around the axis. Of these, the first cam disk 34 is fixed to the operation knob 5. On the other hand, the second cam disk 35 is disposed so as to be rotatable with respect to the operation knob 5 and movable in the axial direction.

  As shown in FIG. 6 which is a side view of the pair of cam disks 34 and 35 and FIG. 7 which is an exploded perspective view, the opposing surfaces are cam surfaces. By rotating the second cam disk 35 relatively in the direction around the axis, the first cam disk 34 and the second cam disk 35 are in close contact with each other, and the second cam is in close contact with the second cam disk 35. The state where the disk 35 is pushed up in the axial direction by the first cam disk 34 is switched.

  Reference numeral 31 denotes a first shaft coupling switching knob that is arranged so as to be rotatable in the direction around the axis coaxially with the operation knob 5 in order to perform the switching operation. Since the protrusion 35a formed on the outer edge of the second cam disk 35 and the vertical groove 31a formed on the inner periphery of the first shaft connection switching knob 31 are engaged, the first shaft connection When the switching knob 31 is rotated in the direction around the axis, the second cam disk 35 is thereby rotated in the direction around the axis.

  Returning to FIG. 4, the rotary substrate 33 provided so as to rotate integrally with the first cam disk 34 (and therefore rotate integrally with the drum rotation operation shaft 18), and rotate integrally with the intermediate base interlocking disk 32. A donut-shaped friction plate 38 made of, for example, a cork plate or a rubber plate is sandwiched between the pressure receiving platen 37 provided as described above. The friction plate 38 may be bonded and fixed to one of the press contact base 33 and the press contact receiving plate 37. In addition, although the press-contact receiving board 37 and the intermediate | middle base interlocking board 32 are engaged in a part of outer edge part, the part is not shown in figure.

  With such a configuration, when the first cam coupling switching knob 31 is rotated to bring the second cam disk 35 into a state where it is strongly pushed up by the first cam disk 34, the press contact base 33 and the press contact receiving plate 37. And the drum rotation operation shaft 18 and the intermediate base rotation operation shaft 19 rotate together, and a gap is formed between the second cam disk 35 and the first cam disk 34. Then, the drum rotation operation shaft 18 and the intermediate base rotation operation shaft 19 are separated, and when the operation knob 5 is rotated, only the first wire take-up drum 11 is rotated in the direction around the axis.

  The second connection switching mechanisms 133 to 138 by the same friction are provided between the press contact receiving plate 137 that rotates integrally with the intermediate base rotation operating shaft 19 and the press contact base 133 fixed to the fixed shaft 7. One set is provided. The first cam disk 134 is fixed to the fixed shaft 7. Since the operation and action are the same as those of the first connection switching mechanisms 33 to 38 described above, description thereof will be omitted. Note that the same reference numerals in the last two digits indicate members having the same function.

  By such second connection switching mechanisms 133 to 138, the state in which the intermediate base rotation operating shaft 19 is fixed to the fixed shaft 7 and the state in which the intermediate base rotation operating shaft 19 can freely rotate with respect to the fixed shaft 7 are Switching can be performed by rotating the shaft connection switching knob 131.

  8 and 9, the second cam disk 35 is pushed up to the friction plate 38 side by the first cam disk 34 by the rotation operation of the two shaft connection switching knobs 31, 131, and the drum rotation operation shaft 18 is in the middle. The base rotation operation shaft 19 is integrated, and the space between the other first cam disk 134 and the second cam disk 135 is loosened so that the intermediate base rotation operation shaft 19 rotates freely with respect to the fixed shaft 7. It shows the state that was made possible.

  When the operation knob 5 is rotated in this state, the drum rotation operation shaft 18 and the intermediate base rotation operation shaft 19 rotate together, and the first wire winding drum 11 and the second wire winding drum 12 Rotate integrally around the axis. Therefore, one of the paired operation wires 13 and 14 is pulled and the other is sent out, and the bendable portion 2 can be bent by remote operation.

  10 and 11 show that the rotation between the first cam disk 34 and the second cam disk 35 is loosened by the rotation operation of the two shaft connection switching knobs 31 and 131, and the drum rotation operation shaft 18 and the intermediate base plate rotation. The operation shaft 19 rotates relatively freely, the second cam disk 135 is pushed down by the first cam disk 134, and the intermediate base rotation operation shaft 19 is integrated with the fixed shaft 7. Yes.

  When the operation knob 5 is rotated in this state, only the drum rotation operation shaft 18 rotates, and only the first wire take-up drum 11 rotates in the direction around the axis. Accordingly, it is possible to perform an operation of strongly pulling the pair of operation wires 13 and 14 simultaneously to maintain the bent shape (and an operation of releasing both of the pair of operation wires 13 and 14 to release the bent holding state). .

  In addition, this invention is not limited to the said Example, For example, the shaft connection switching mechanism 30 may utilize what kind of other mechanism. Further, the flexible tube portion 1 may be composed entirely of a bendable portion.

  The present invention is not limited to the endoscope guide tube device, but can be applied to an endoscope itself, an endoscope treatment tool used through an endoscope treatment tool insertion channel, and the like. it can.

DESCRIPTION OF SYMBOLS 1 Flexible tube part 2 Bendable part 4 Operation part 5 Operation knob (rotation operation member)
7 Fixed shaft 11 First wire winding drum 12 Second wire winding drum 13, 14 Operation wire 17 Intermediate base 18 Drum rotation operation shaft 19 Intermediate base rotation operation shaft 21 First gear 22 Second gear 23 Intermediate Small gear 30 Axis connection switching mechanism 31, 131 Axis connection switching knob 32 Intermediate base interlocking panel 33, 133 Pressure contact base 34, 134 First cam disk 35, 135 Second cam disk 37, 137 Pressure contact base

Claims (2)

The bending shape of the bendable portion provided on the distal end side of the flexible tube portion inserted into the body cavity simultaneously pulls the paired operation wires from the operation portion side provided on the rear end side of the flexible tube portion. It is held by operating and increasing the tension of the two operation wires, and by pulling one of the pair of operation wires and sending the other to the distal end side, the bendable part becomes the pulled operation wire. In the bending shape maintaining operation device for the insertion tube in the body cavity configured to bend in a corresponding direction,
A first and second pair of wire winding drums are rotatably and coaxially arranged on the operation portion, respectively, and the rear end portion of the pair of operation wires, one of which is the first wire winding drum. The other side of the take-up drum is wound around the second wire take-up drum in a reverse direction and drawn toward the flexible tube portion,
The pair of wire take-up drums are integrally provided with gears around the axis, and intermediate small gears that mesh with both the gears provided on the pair of wire take-up drums are rotatably attached. An intermediate base is disposed between the pair of wire winding drums so as to be rotatable in the direction around the axis,
A drum rotation operation shaft is coupled to the first wire winding drum, and an intermediate substrate rotation operation shaft is coupled to the intermediate substrate,
By integrally rotating the drum rotation operation shaft and the intermediate base rotation operation shaft, the first wire take-up drum and the second wire take-up drum rotate integrally around the axis. Then, one of the paired operation wires is pulled, and at the same time, the other is sent to the tip side, and the bendable part is bent,
By fixing the intermediate base rotation operation shaft and rotating only the drum rotation operation shaft, the first wire take-up drum and the second wire take-up drum rotate in opposite directions around the axis. Then, both of the paired operation wires are pulled together or sent to the distal end side, and the bent shape of the bendable portion is held / released. Shape holding operation device.   An operation for integrally rotating the drum rotation operation shaft and the intermediate base rotation operation shaft and an operation for fixing the intermediate base rotation operation shaft and rotating only the drum rotation operation shaft are performed as one rotation operation member. 2. A shaft connection switching mechanism for switching a connection state of the drum rotation operation shaft and the intermediate base rotation operation shaft with respect to the rotation operation member is provided in the operation section so that the operation portion can be operated. The bending shape holding | maintenance operating device of insertion pipe | tubes in the body cavity of this.

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