JP2010136737A - Endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a fine adjustment of the amount of pushing and pulling an erecting wire. <P>SOLUTION: A coarse adjustment knob 46 and a fine adjustment knob 47 for adjusting the amount of pushing and pulling the erecting wire 29 are provided to be coaxial with bending knobs 40, 41 for bending a bending portion at the distal end of the insertion portion. Since the rotating operation of the coarse adjustment knob 46 is directly transmitted to an erecting pulley 83 on which the erecting wire 29 is put by a cylindrical member 88, the amount of pushing and pulling the erecting wire 29 is coarsely adjusted. The rotating operation of the fine adjustment knob 47 is transmitted to the erecting pulley 83 by reducing a speed by the cylindrical member 80, a sun gear 79, a planetary gear 85, and an outer gear 84. Consequently, the amount of pushing and pulling the erecting wire 29 is finely adjusted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an endoscope including an upright that adjusts a distal end position of a treatment instrument by pressing and bending a treatment instrument protruding from an outlet of a forceps channel.

  A forceps channel into which a treatment tool such as a puncture needle can be inserted is incorporated in the insertion portion to be inserted into the body cavity, and the treatment tool is projected from the forceps channel outlet provided on the distal end side of the insertion portion to perform treatment in the body cavity. Endoscopes that can be used are known. An endoscope is also known in which a treatment tool protruding from the forceps channel outlet is pressed by an upright stand disposed in the vicinity of the forceps channel outlet, and the distal end position of the treatment tool can be adjusted by bending the treatment tool. (For example, refer to Patent Document 1).

  The upright has a shape such as a quadrangular prism or a triangular prism, and one end is pivotally supported on the distal end side of the insertion portion. One end of an upright wire for rotating the upright base is locked to the upright base by being pushed and pulled in the insertion portion. The other end of the standing wire is locked to a standing pulley that is rotatably supported in an operation unit connected to the proximal end side of the insertion unit. A rotatable operation member provided outside the operation portion is coaxially connected to the standing pulley. When the operation member is rotated, the standing pulley rotates in conjunction with the operation member, and the stand is rotated.

An endoscope provided with an upright has been invented, for example, by changing the position of a power point for raising the upright so that the operation of raising the upright can be performed with a small force (for example, Patent Documents). 2). An endoscope has also been invented that allows a stable treatment operation to be performed by pressing a treatment tool with an upright table and locking it to the distal end of the insertion portion (see, for example, Patent Document 3). Furthermore, a treatment tool that is erected on a stand is inserted into a slit provided at the distal end of the insertion portion, and the lateral movement of the treatment instrument is reduced (for example, see Patent Document 4), and treatment instruments of different sizes can be stabilized. In order to be able to hold them, a structure in which grooves having different sizes are formed on an upright stand (for example, see Patent Document 5) has been invented.
Japanese Patent Application Laid-Open No. 08-126604 JP 09-084747 A JP 2003-305002 A JP 2004-209137 A JP 2004-267596 A

  Conventionally, since the stand was rotated by the turning operation of the operation member directly connected to the stand-up pulley, it was not possible to finely adjust the pulling amount of the stand-up wire, that is, the turn position of the stand. In addition, since the amount of rotation of the stand is large with respect to the rotation operation of the operation member, when the treatment tool is pressed with the stand, the distal end of the treatment tool may be greatly shaken. If the distal end of the treatment instrument is greatly shaken, not only is the adjustment of the distal end position difficult, but the tip position cannot be confirmed until the shaking is settled, so that adjustment takes time.

  An object of the present invention is to make it possible to finely adjust the amount by which the standing wire is pushed and pulled.

  The endoscope of the present invention includes an upright stand, an upright wire, an upright pulley, an operation member, and a speed reduction mechanism. The stand is rotated in the vicinity of the outlet of the forceps channel provided on the distal end side of the insertion portion, and presses and bends the treatment tool protruding from the outlet of the forceps channel. One end of the upright wire is locked to the upright base, and the upright base is rotated by being pushed and pulled in the insertion portion. In the standing pulley, the other end of the standing wire is locked to the outer periphery, and rotates within the operation portion connected to the proximal end side of the insertion portion to push and pull the standing wire. The operation member is rotatably supported by the operation unit. The deceleration mechanism decelerates the rotation of the operation member and transmits it to the standing pulley.

  The operation portion is provided with a bending operation knob for bending a bending portion provided on the distal end side of the insertion portion, and the operation member is provided coaxially with the bending operation knob. Thereby, the operativity of an operation member improves.

  The speed reduction mechanism includes a sun gear that rotates integrally with the operation member, a plurality of planetary gears that mesh with the sun gear, and an outer ring gear that is provided integrally with the standing pulley and meshes with the plurality of planetary gears. You may comprise by. Thereby, rotation of an operation member can be decelerated efficiently.

  You may provide the 2nd operation member which rotates the pulley for standing up not via a deceleration mechanism. According to this, the amount by which the standing wire is pushed and pulled can be roughly adjusted.

  Another speed reduction mechanism may be composed of a rotating shaft, a sun gear, a first connection gear, a second connection gear, a planetary gear, and an outer ring gear. The rotating shaft is provided integrally with the operation member, and is movable between a first position and a second position set in the axial direction. The sun gear and the first connecting gear are provided on the outer periphery of the rotating shaft. The second rolling gear is provided integrally with the standing pulley, and meshes with the first connecting gear when the rotation shaft is in the first position. The plurality of planetary gears mesh with the sun gear when the rotation shaft is in the second position. The outer ring gear is provided integrally with the standing pulley and meshes with a plurality of planetary gears. Thereby, the amount by which the wire for standing is pushed and pulled can be roughly adjusted and finely adjusted by one operating member.

  Still another speed reduction mechanism may be composed of a rotating shaft, a first drive gear, a second drive gear, a first driven gear, and a second driven gear. The rotation shaft is provided integrally with the operation member, and is movable between a first position and a second position set in the axial direction. The first drive gear and the second drive gear are provided on the rotation shaft. The second drive gear has a smaller diameter than the first drive gear. The first driven gear and the second driven gear are provided coaxially so as to rotate integrally with the standing pulley. The first driven gear meshes with the first drive gear when the rotation shaft is in the first position. The second driven gear meshes with the second drive gear when the rotation shaft is in the second position. According to this, since a simplified speed reduction mechanism can be used, the cost can be reduced.

  Still another speed reduction mechanism includes a drive gear that rotates integrally with the operating member, and a driven gear that has a larger diameter than the drive gear and meshes with the drive gear and rotates integrally with the standing pulley. Also good.

  Another reduction mechanism may be constituted by a worm gear that rotates integrally with the operation member, and a wheel gear that meshes with the worm gear and rotates integrally with the standing pulley.

  A magnetic gear may be used as each gear.

  Another endoscope of the present invention includes a stand, a stand-up wire, a rotation lever, and a male screw member. The stand is rotated in the vicinity of the outlet of the forceps channel provided on the distal end side of the insertion portion, and presses and bends the treatment tool protruding from the outlet of the forceps channel. One end of the standing wire is locked to the standing base, and is pushed and pulled in the insertion portion, thereby rotating the standing base. The rotation lever is rotatably incorporated in an operation unit connected to the proximal end side of the insertion unit, and the other end of the standing wire is locked to one end. The male screw member is screwed into a female screw provided in the operation unit, the tip is linked to the other end of the rotary lever, and the operation member disposed outside the operation unit is integrally provided at the rear end. . As the male screw member advances and retreats in the female screw, the rotating lever rotates. Thereby, the amount by which the standing wire is pushed and pulled can be finely adjusted.

  The female screw is provided on a female screw member formed on the outer periphery with a coarse pitch male screw having a coarser pitch than the male screw of the male screw member, and the female screw member is provided on the coarse pitch female screw provided on the operation unit. It is screwed. When the female screw member is rotated by the second operation member provided integrally, the rotation lever is rotated via the male screw member. The amount by which the standing wire is pushed and pulled can be roughly adjusted.

  According to the endoscope of the present invention, it is possible to finely adjust the push-pull amount of the erection wire that rotates the erection table, so that the distal end position of the treatment instrument can be adjusted with high accuracy. Further, since the amount of the standing wire to be pushed and pulled can be roughly adjusted, the distal end position of the treatment instrument can be adjusted efficiently.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
An ultrasonic endoscope 2 shown in FIG. 1 includes an insertion portion 3 to be inserted into a body cavity, an operation portion 4 connected to a proximal end portion 3a of the insertion portion 3, and a universal cord 5 attached to the operation portion 4. And. The universal cord 5 has flexibility and is detachably connected to an ultrasonic processor device and an endoscope processor device (not shown) which are external devices.

  The insertion portion 3 is a rod-shaped body having a circular cross section, and is composed of a flexible portion 8, a bending portion 9, and a distal end portion 10 from the base end portion 3a side. The soft part 8 occupies most of the length of the insertion part 3, and has flexibility. The bending portion 9 has a structure that is bent by an operation on the operation portion 4. As shown in FIG. 2, the distal end portion 10 includes a treatment instrument delivery unit 13, an endoscope unit 14, and an ultrasonic examination unit 15.

  The treatment instrument delivery unit 13 includes a forceps channel outlet 18, a treatment instrument delivery groove 19, and a stand 20. The forceps channel outlet 18 is an opening provided at the tip of the bending portion 9 and is connected to one end of a cylindrical forceps channel 21 built in the insertion portion 3 as shown in FIG. The other end of the forceps channel 21 is connected to a forceps channel inlet 22 (see FIG. 1) provided in the operation unit 4. A treatment instrument such as a puncture needle 23 used for injecting a medical solution into a body cavity, collecting a tissue, or the like is inserted from the forceps channel inlet 22 and protrudes from the forceps channel outlet 18.

  The treatment instrument delivery groove 19 is a passage for opening the front and upper sides of the forceps channel outlet 18 and feeding the puncture needle 23 protruding from the forceps channel outlet 18 out of the insertion portion 3. The treatment instrument delivery groove 19 is formed in the hard portion 26 constituting the endoscope portion 14.

  As shown in FIG. 3, the upright 20 has a substantially quadrangular prism shape, and one end 20 a is pivotally supported in the treatment instrument delivery groove 19 and is rotatable. One end of an upstanding wire 29 inserted into the insertion portion 3 is locked to the upright 20. The stand 20 rotates when the standing wire 29 is pushed and pulled in the insertion portion 3, and presses and bends the puncture needle 23 at the other end 20b.

  The endoscope unit 14 includes a hard portion 26, an imaging window 32, an illumination window 33, and an air / water supply nozzle 34 provided on the front surface 26 a of the hard portion 26. The front surface 26 a is inclined with respect to an orthogonal plane orthogonal to the axial direction of the insertion portion 3 so that the distal end direction of the puncture needle 23 can be imaged.

  The imaging window 32 is a window for imaging the inside of a body cavity with a photographing lens and an imaging element incorporated therein. The endoscopic processor device connected by the universal cord 5 generates an image based on the imaging signal output from the imaging device and displays the image on the monitor. The illumination window 33 has a light guide incorporated therein. The light guide guides the light emitted from the light source of the endoscope processor device and illuminates the body cavity from the illumination window 33. The air / water supply nozzle 34 performs cleaning by spraying water or air supplied from the endoscope processor device onto the imaging window 32.

  The ultrasonic inspection unit 15 has a curved surface 37 that is curved along the longitudinal direction of the insertion unit 3, and a plurality of ultrasonic transducers (not shown) arranged along the curved direction therein. It has been incorporated. The ultrasonic inspection unit 15 drives each ultrasonic transducer to scan the inside of the body with an ultrasonic wave, receives an ultrasonic echo reflected in the body, and outputs an echo signal. The ultrasonic processor device connected to the universal cord 5 generates an image based on the echo signal and displays it on the monitor.

  As shown in FIG. 4, the operation unit 4 is an elongated rod-like body, and is gripped by an operator who operates the ultrasonic endoscope 2. On one side surface 4a of the operation unit 4, an up / down bending operation knob 40 used for bending operation of the bending unit 9 and a left / right bending operation knob 41 having a larger diameter are rotatably provided. Further, on another side surface 4 b of the operation unit 4, an air / water supply switch 42 that ejects water and air from the air / water supply port 34, and a suction switch 43 that sucks body fluid and the like from the body cavity using the forceps channel 21. And are provided.

  On the same axis as the bending operation knobs 40 and 41, a coarse adjustment knob 46 and a fine adjustment knob 47 used for pulling the standing wire 29 are rotatably provided. The coarse adjustment knob 46 has a larger diameter than the fine adjustment knob 47, and is used when coarsely adjusting the push-pull amount of the standing wire 29. The fine adjustment knob 47 has a diameter larger than that of the left / right bending operation knob 41 and is used when fine adjustment of the push-pull amount of the standing wire 29 is performed.

  Reference numeral 49 denotes a stopper for locking the coarse adjustment knob 46 and the fine adjustment knob 47. As shown in FIG. 5, the stopper 49 is attached to a rail member 50 provided on the operation portion 4 and is slidable in the radial direction of the coarse adjustment knob 46 and the like. A spring 51 is attached between the stopper 49 and the rail member 50 to press the tip 49 a of the stopper 49 against the outer periphery of the coarse adjustment knob 46 and the fine adjustment knob 47. The coarse adjustment knob 46 and the fine adjustment knob 47 are locked when the tip of the stopper 49 is pressed against the outer periphery, and can be rotated when the stopper 49 is slid against the bias of the spring 51. It becomes.

  FIG. 6 is a cross-sectional view of the operation unit 4 passing through the center of the bending operation knob 40 and the like. The operation unit 4 includes a lower case 53 and an upper case 54 coupled on the lower case 53. The joint portion between the lower case 53 and the upper case 54 has a staggered step shape, and a packing is incorporated therebetween.

  In the lower case 53, a plate-like partition member 57 that partitions the operation portion 4 and forms a channel chamber 56 is attached. In the channel chamber 56, the forceps channel 21, the air / water supply channel 58 connected to the air / water supply nozzle 34, the endoscope signal cable 59 connected to the endoscope unit 14, and the ultrasonic examination unit 15 are connected. The ultrasonic signal cable 60, the light guide 61 and the like are accommodated.

  On the upper surface of the partition wall member 57, a rotating shaft 64 that rotatably supports the bending operation knob 40 and the like is provided along the orthogonal direction. The distal end of the rotation shaft 64 protrudes outside the operation unit 4 through an opening 65 formed in the upper case 53. The rotating shaft 64 has a circular cross section (see FIG. 8).

  A cylindrical portion 68 of a vertical bending pulley 67 is rotatably fitted to the rotary shaft 64. At the lower end of the cylindrical portion 68, there is provided a pulley portion 70 around which an up and down bending wire 69 is hung. The vertical bending wire 69 is inserted into the insertion portion 3, and both ends thereof are connected to the bending structure in the bending portion 9. The upper end of the cylindrical portion 68 does not penetrate, and the vertical bending operation knob 40 is fixed to the outer periphery. When the up / down bending operation knob 40 is rotated, the pulley portion 70 rotates in the same direction by the same amount, and the up / down bending wire 69 is pulled in the insertion portion 3. The bending portion 9 is bent in the vertical direction shown in FIG.

  On the outer periphery of the cylindrical portion 68, a cylindrical portion 74 of a left and right bending pulley 73 is rotatably fitted. The cylindrical portion 74 has a height dimension lower than that of the cylindrical portion 68, and a pulley portion 76 is provided at the lower end thereof. The left and right bending wires 75 are inserted into the insertion portion 3, and both ends are connected to the bending structure in the bending portion 9. A left and right bending operation knob 41 disposed below the up and down bending operation knob 40 is fixed to the upper end of the cylindrical portion 74. When the left / right bending operation knob 41 is rotated, the pulley portion 76 rotates in the same direction by the same amount, and the left / right bending wire 75 is pulled in the insertion portion 3. The bending portion 9 is bent in the left-right direction shown in FIG.

  As shown in FIG. 7 in which the portion A of FIG. 6 is enlarged, a cylindrical member 80 having a sun gear 79 formed on the outer periphery on the lower end side is rotatably fitted to the outer periphery of the cylindrical portion 74. The cylindrical member 80 has a height dimension lower than that of the cylindrical portion 74, and a fine adjustment knob 47 disposed below the left / right bending operation knob 41 is fitted to the upper end of the cylindrical member 80.

  On the outer periphery of the cylindrical member 80, a standing pulley 83 is rotatably fitted below the sun gear 79. On the standing pulley 83, the standing wire 29 is hung and the other end is locked. Further, an outer ring gear 84 having a tooth row formed on the inner diameter surface is provided on the outer periphery of the upper surface of the standing pulley 83.

  As shown in FIG. 8 showing a cross section in a direction orthogonal to the outer ring gear 84, three planetary gears 85 arranged at an equal angle in the circumferential direction are rotatably supported by a rotating shaft 86 on the upper surface of the standing pulley 83. It is supported. The three planetary gears 85 mesh with the sun gear 79 and the outer ring gear 84. In order to avoid complication of the drawing of FIG. 7, illustration of the up and down bending wire 69 and the left and right bending wire 75 is omitted.

  A cylindrical member 88 is rotatably fitted on the outer periphery of the cylindrical member 80 and above the sun gear 79. A flange portion 89 whose outer periphery engages with the upper end of the outer ring gear 84 is integrally provided at the lower end of the cylindrical member 88. The cylindrical member 88 has a height dimension lower than that of the cylindrical member 80, and a coarse adjustment knob 46 disposed below the fine adjustment knob 47 is fixed to the upper end.

  The cylindrical portions 68 and 74 and the outer peripheral surface of the cylindrical member 80 are fitted with packings that provide airtightness. Further, a packing that contacts the outer peripheral surface of the cylindrical member 88 is also fitted into the opening 65 of the operation unit 4. As a result, water or the like is prevented from entering the operation unit 4 from the gaps between the knobs.

  A guide member 92 that guides the wires 69, 75, 29 on the outer periphery of the pulleys 70, 76, 83 is attached to the upper surface of the partition wall member 57. As shown in FIG. 7, the guide member 92 has a semicircular shape that opens a path for inserting the wires 69, 75, and 29 into the insertion portion 3. Further, the upper surface 92 a of the guide member 92 is in contact with the upper portion of the flange portion 89 of the cylindrical member 88, thereby suppressing the movement of the knobs 40, 41, 46, 47 in the axial direction.

  A regulating member 95 protruding from the outer peripheral surface is attached to the standing wire 29 at a predetermined position in the operation unit 4. Further, a regulation guide 96 is provided at a predetermined position in the operation unit 4 so as to come into contact with the regulation member 95 when the standing wire 29 is pulled and to define a pulling range of the standing wire 29.

  Next, the above embodiment will be described. In a state where the insertion portion 3 of the ultrasonic endoscope 2 is inserted into the body cavity, a treatment instrument such as the puncture needle 23 is inserted into the forceps channel entrance 22. As shown in FIG. 3, the puncture needle 23 passes through the forceps channel in the insertion portion 3 and protrudes from the forceps channel outlet 18.

  The tip position of the puncture needle 23 is adjusted while confirming an image photographed by the endoscope unit 14 on a monitor. First, the rough adjustment knob 46 is rotated to adjust the tip position of the puncture needle 23 roughly. The rotation of the coarse adjustment knob 46 is directly transmitted to the standing pulley 83 via the cylindrical member 88, and the standing wire 29 is pushed and pulled in the insertion portion 3. The upright stand 20 pushed and pulled by the upright wire 20 rotates about the one end 20a to press the puncture needle 23.

  After the coarse adjustment by the coarse adjustment knob 46, the fine adjustment knob 47 is rotated, and the tip position of the puncture needle 23 is finely adjusted. The rotation of the fine adjustment knob 47 is transmitted to the standing pulley 83 via the sun gear 79 of the cylindrical member 80, the three planetary gears 85, and the outer ring gear 84. At this time, since the rotation of the fine adjustment knob 47 is decelerated, the standing pulley 83 rotates by a minute amount, and the standing wire 29 is pushed and pulled by a minute amount. Thereby, the rotation position of the stand 20 can be finely adjusted. After adjustment of the tip position, the puncture needle 23 is operated to perform treatment.

  As described above, according to the present invention, the amount of pushing and pulling the standing wire 29 can be finely adjusted, so that the distal end position of the treatment instrument can be accurately adjusted. In addition, when the tip position of the treatment tool is finely adjusted, the stand 20 is rotated by a minute amount, so that the tip of the treatment tool does not shake greatly. Thereby, position adjustment can be easily performed.

  In the first embodiment, the coarse adjustment knob 46 is arranged coaxially with the fine adjustment knob 47, but may be arranged on a different axis. In this case, for example, a driven gear may be formed on the outer periphery of the standing pulley 83 and a driving gear provided on the outer periphery of the coarse adjustment knob 46 may be engaged with the driven gear. Moreover, although a normal gear is used as the gear such as the sun gear 79, a magnetic gear that performs magnetic engagement without contact may be used, for example. By using a magnetic gear, effects such as low dust generation, clean sound, and low maintenance can be obtained.

[Second Embodiment]
In the first embodiment, the coarse adjustment knob 46 and the fine adjustment knob 47 are provided for coarse adjustment and fine adjustment of the distal end position of the treatment instrument, but a single operation knob may be used. Hereinafter, the second embodiment in which coarse adjustment and fine adjustment can be performed with one operation knob will be described, but detailed description of the same components as those in the first embodiment will be omitted.

  As shown in FIGS. 9A and 9B, the tubular member 101 having the operation knob 100 attached to the upper end is fitted to the outer periphery of the cylindrical portion 74 so as to be rotatable and slidable in the axial direction. When roughly adjusting the distal end position of the treatment instrument, the tubular member 100 is slid to the coarse adjustment position shown in FIG. 5A, and when finely adjusted, the cylinder member 100 is slid to the fine adjustment position shown in FIG. The cylindrical member 101 is provided with a C ring 102, a flange portion 103, a first connecting gear 104, a sun gear 105, and a spring receiving portion 106 from the top.

  The C ring 102 is fitted on the outer periphery of the cylindrical member 101. When the cylindrical member 101 is slid to the fine adjustment position, the C-ring 102 is fitted into a groove 65a provided in the opening 65 of the operation unit 4, and the cylindrical member 101 is held so as to be rotatable at the fine adjustment position. To do.

  The flange portion 103 is formed so as to protrude in the circumferential direction from the outer periphery of the cylindrical member 102. The first connecting gear 104 is constituted by a magnetic gear, and is provided on the outer peripheral surface of the flange portion 103. The sun gear 105 is configured by a magnetic gear, like the first connecting gear 104, and is provided below the flange portion 103. The spring receiving portion 106 has a flange shape provided on the outer periphery of the cylindrical member 101, and receives an upper portion of the coil spring 109 mounted on the outer periphery so as to urge the cylindrical member 101 toward the coarse adjustment position. Yes.

  The standing pulley 112 has a substantially cylindrical shape, and is disposed on the left and right bending pulley 73 and on the outer periphery of the cylindrical member 101. The standing pulley 112 has a ring-shaped protrusion 113 formed on the lower surface thereof fitted in a recess 114 formed on the upper surface of the left and right bending pulley 73, so that it can rotate without being eccentric. .

  A projecting portion 117 projecting upward is formed on the outer periphery of the upper surface of the standing pulley 112. A second connection gear 118 that magnetically meshes with the first connection gear 104 when the cylindrical member 101 is in the coarse adjustment position is provided on the upper inner diameter of the protrusion 117. In addition, an outer ring gear 119 composed of a magnetic gear is provided on the lower inner diameter of the protruding portion 117.

  Three planetary gears 122 arranged at equal angles in the circumferential direction are rotatably supported by a rotating shaft 123 on the upper surface of the standing pulley 112. The three planetary gears 122 are composed of magnetic gears and are magnetically engaged with the outer ring gear 119. Further, the three planetary gears 122 mesh with the sun gear 105 when the cylindrical member 101 slides to the fine adjustment position.

  The operation of the second embodiment will be described. As shown in FIG. 9A, when the operation knob 100 is rotated while the cylinder member 101 is in the rough adjustment position, the rotation of the cylinder member 101 is transmitted via the first connection gear 104 and the second connection gear 118. Since the signal is transmitted to the standing pulley 112, the amount by which the standing wire 29 is pushed and pulled can be roughly adjusted. The planetary gear 122 does not mesh with the sun gear 105 when the cylindrical member 101 is in the coarse adjustment position, and therefore rotates following the outer ring gear 119.

  When the amount of pushing and pulling the standing wire 29 is finely adjusted, as shown in FIG. 9B, the operation knob 100 is pressed in the axial direction, and the cylindrical member 101 is slid to the fine adjustment position. The cylindrical member 101 is stopped at the fine adjustment position against the urging of the spring 109 by fitting the C ring 102 into the groove 65a in the opening 65. When the cylindrical member 101 is slid to the fine adjustment position, the magnetic engagement between the first connection gear 104 and the second connection gear 118 is released, and the sun gear 105 and the planetary gear 122 are magnetically engaged. The rotation of the operation knob 100 is decelerated and transmitted to the standing pulley 112 by the sun gear 105, the planetary gear 122, and the outer ring gear 119, so that the amount of pushing and pulling the standing wire 29 can be finely adjusted.

  In the second embodiment, when the cylindrical member 101 is slid, it is necessary to immediately mesh the first coupling gear 104 and the second coupling gear 104 with the sun gear 10 and the planetary gear 122. Although used, normal gears can also be used.

[Third Embodiment]
In the first and second embodiments, the planetary gear mechanism is used as the speed reduction mechanism. However, the cost can be reduced by using a simple speed reduction mechanism. Hereinafter, the third embodiment using a simplified speed reduction mechanism will be described, but detailed description of the same components as those of the first and second embodiments will be omitted.

  In the third embodiment shown in FIG. 10A, a rotary shaft 131 that rotates integrally with the operation knob 130 is rotatably supported by the opening 132 of the operation portion 4 and the cylindrical bearing portion 133. The rotating shaft 131 is slidable between a coarse adjustment position shown in FIG. 5A and a fine adjustment position shown in FIG. The rotating shaft 131 is held at a fine adjustment position by fitting a C-ring 134 provided below the operation knob 130 into the recess 132 a in the opening 132.

  The rotary shaft 131 is provided with a first drive gear 137 formed of a magnetic gear and a second drive gear 138 having a smaller diameter than the first drive gear 137. A coil spring 139 that biases the rotating shaft 131 toward the coarse adjustment position is mounted on the outer periphery of the rotating shaft 131 between the bearing portion 133 and the second drive gear 138.

  A rotation shaft 142 disposed in parallel with the rotation shaft 131 is rotatably supported in the operation unit 4. The rotating shaft 142 is provided with a first driven gear 143, a second driven gear 144, and a standing pulley 145 around which a standing wire 29 is hung. The first driven gear 143 is magnetically engaged with the first drive gear 137 when the rotating shaft 131 is in the coarse adjustment position, and the second driven gear 144 is second when the rotating shaft 131 is in the fine adjustment position. Magnetically meshes with the drive gear 138.

  As shown in FIG. 10A, when the operation knob 130 is rotated with the rotating shaft 131 in the coarse adjustment position, the first driving gear 137 rotates through the first driven gear 143 to rise. Is transmitted to. Since the first driven gear 143 has a smaller diameter than the first drive gear 137, the rotation of the standing pulley 145 with respect to the rotation of the operation knob 130 is increased, and the amount of pushing and pulling the standing wire 29 is roughly adjusted. .

  As shown in FIG. 10B, when the operation knob 130 is rotated with the rotary shaft 131 in the fine adjustment position, the rotation of the second drive gear 138 is caused to stand up via the second driven gear 144. It is transmitted to the pulley 145. Since the second driven gear 144 has a diameter larger than that of the second drive gear 138, the rotation of the standing pulley 145 with respect to the rotation of the operation knob 130 becomes low speed, and the amount of pushing and pulling the standing wire 29 is finely adjusted. .

[Fourth Embodiment]
In the third embodiment, the amount by which the standing wire 29 is pushed and pulled can be roughly adjusted and finely adjusted by one operation knob 130. However, as in the first embodiment, the coarse adjustment knob and A knob for fine adjustment may be provided. Hereinafter, although 4th Embodiment using two knobs is described, detailed description is abbreviate | omitted about the component same as 1st-3rd embodiment.

  In the fourth embodiment shown in FIG. 11, a coarse adjustment knob 152 and a fine adjustment knob 153 are respectively attached to rotating shafts 150 and 151 arranged in parallel. A driven gear 154 made up of a magnetic gear and a standing pulley 155 are attached to the rotating shaft 150. A drive gear 156 that is magnetically engaged with the driven gear 154 is attached to the rotating shaft 151. The drive gear 156 has a smaller diameter than the driven gear 154.

  Since the rotation of the coarse adjustment knob 152 is directly transmitted to the standing pulley 155, the amount by which the standing wire 29 is pushed and pulled is roughly adjusted. Further, since the rotation of the fine adjustment knob 153 is transmitted to the standing pulley 155 via the drive gear 156 and the driven gear 154, the rotation of the standing pulley 155 with respect to the rotation of the fine adjustment knob 153 becomes low speed. The amount by which the standing wire 29 is pushed and pulled is finely adjusted.

[Fifth Embodiment]
As in the fifth embodiment shown in FIG. 12, the wheel gear 161 provided coaxially with the standing pulley 160 may be rotated by the worm gear 163 provided coaxially with the fine adjustment knob 162.

[Sixth Embodiment]
In the sixth embodiment shown in FIG. 13, a substantially L-shaped rotation lever 170 provided rotatably around the rotation shaft 170 a in the operation unit 4, and a male screw member 171 linked to one end of the rotation lever 170. And a female screw member 172. The rear end of the standing wire 29 is locked to the other end of the rotation lever 170.

  The male screw member 171 includes a linkage portion 171a linked to the rotation lever 170, a male screw portion 174 screwed to the female screw 173 formed on the female screw member 172, and a micro screw that rotates the male screw portion 174. And an adjustment knob 175. The female screw member 172 has a coarse pitch male screw 176 having a coarser pitch than the male screw portion 174 formed on the outer periphery. The coarse pitch male screw 176 is screwed into a coarse pitch female screw 177 formed in the operation unit 4. The female screw member 172 is integrally provided with a coarse adjustment knob 178 for rotating the coarse pitch female screw 176.

  The male screw member 171 moves together in the axial direction when the female screw member 172 is rotated, and rotates the rotation lever 170. At this time, the amount of movement of the male screw member 171 in the axial direction is relatively large with respect to the rotation of the coarse adjustment knob 178 because the coarse pitch male screw 176 and the coarse pitch female screw 177 are screwed together. Therefore, the amount by which the standing wire 29 is pushed and pulled is roughly adjusted.

  Further, when only the male screw member 171 is rotated, the male screw member 171 moves in the axial direction with respect to the female screw member 172 and rotates the rotation lever 170. The amount of axial movement of the male screw member 171 at this time is performed by the engagement of the male screw portion 174 and the female screw 173 with a finer pitch than the coarse pitch male screw 176, etc. Relatively small. Therefore, the amount by which the standing wire 29 is pushed and pulled is finely adjusted.

  In each of the above embodiments, a normal gear or a magnetic gear has been described as an example, but the same effect can be obtained regardless of which is used. In addition, the present invention is not limited to the above-described embodiments, and various improvements and modifications may be made without departing from the spirit of the present invention.

It is a top view which shows the endoscope of this invention. It is a perspective view which shows the structure of the front-end | tip part of an endoscope. It is sectional drawing along the longitudinal direction of the front-end | tip part. It is a top view which shows the structure of an operation part. It is sectional drawing which shows the structure of a stopper. It is sectional drawing of the operation part which shows the planetary gear mechanism of 1st Embodiment. It is an enlarged view of the A section of FIG. It is sectional drawing which cut | disconnected the pulley for standing up in the direction orthogonal to an axial direction. It is sectional drawing which shows the deceleration mechanism of 2nd Embodiment. It is sectional drawing which shows the deceleration mechanism of 3rd Embodiment. It is sectional drawing which shows the deceleration mechanism of 4th Embodiment. It is sectional drawing which shows the deceleration mechanism of 5th Embodiment. It is sectional drawing which shows the deceleration mechanism of 6th Embodiment.

Explanation of symbols

2 Ultrasound endoscope 3 Insertion section 4 Operation section 10 Tip section 18 Forceps channel outlet 20 Stand base 23 Puncture needle 29 Standing wire 46 Coarse adjustment knob 47 Fine adjustment knob 79, 105 Sun gear 83, 112, 145, 155, 160 Standing pulleys 84, 119 Outer ring gears 85, 122 Planetary gears 104 First connection gear 118 Second connection gear 131 Rotating shaft 137 First drive gear 138 Second drive gear 143 First driven gear 144 Second driven gear 156 Drive gear 154 Driven gear 161 Wheel gear 163 Worm gear 170 Rotating lever 171 Male screw member 172 Female screw member

Claims (11)

A stand that rotates in the vicinity of the outlet of the forceps channel provided on the distal end side of the insertion portion and presses and bends the treatment tool protruding from the outlet of the forceps channel;
One end of the standing base is locked, and the standing wire that rotates the standing base by being pushed and pulled in the insertion portion;
The other end of the standing wire is locked to the outer periphery, and the standing pulley is rotated within the operation unit connected to the proximal end side of the insertion unit to push and pull the standing wire,
An operation member rotatably supported by the operation unit;
An endoscope comprising: a reduction mechanism that decelerates the rotation of the operation member and transmits the reduced rotation to the pulley for standing up.   The operation portion is provided with a bending operation knob for bending a bending portion provided on the distal end side of the insertion portion, and the operation member is provided coaxially with the bending operation knob. The endoscope according to claim 1.   The reduction mechanism is provided integrally with the sun gear rotating integrally with the operation member, the plurality of planetary gears meshed with the sun gear, and the standing pulley, and meshed with the plurality of planetary gears. The endoscope according to claim 2, further comprising an outer ring gear.   The endoscope according to claim 3, further comprising a second operation member that rotates the standing pulley without using the speed reduction mechanism. The speed reduction mechanism is provided integrally with the operation member, and a rotation shaft that is movable between a first position and a second position set in the axial direction;
A sun gear and a first connecting gear provided on the outer periphery of the rotating shaft;
A second connecting gear provided integrally with the standing pulley and meshing with the first connecting gear when the rotating shaft is in the first position;
A plurality of planetary gears meshing with the sun gear when the rotation shaft is in the second position;
3. The endoscope according to claim 2, further comprising an outer ring gear provided integrally with the standing pulley and meshing with the plurality of planetary gears. The speed reduction mechanism is provided integrally with the operation member, and a rotation shaft that is movable between a first position and a second position set in the axial direction;
A first drive gear provided on the rotating shaft, and a second drive gear having a smaller diameter than the first drive gear;
A first driven gear that is coaxially provided so as to rotate integrally with the standing pulley, and meshes with the first drive gear when the rotary shaft is in the first position, and the rotary shaft is the second The endoscope according to claim 1, further comprising: a second driven gear that meshes with the second drive gear when in the position. The speed reduction mechanism includes a drive gear that rotates integrally with the operation member;
The endoscope according to claim 1, further comprising a driven gear having a larger diameter than the drive gear and meshing with the drive gear and rotating integrally with the standing pulley. The speed reduction mechanism includes a worm gear that rotates integrally with the operation member;
The endoscope according to claim 1, further comprising a wheel gear that meshes with the worm gear and rotates integrally with the standing pulley.   The endoscope according to claim 3, wherein each gear is a magnetic gear. A stand that rotates in the vicinity of the outlet of the forceps channel provided on the distal end side of the insertion portion and presses and bends the treatment tool protruding from the outlet of the forceps channel;
One end of the standing base is locked, and the standing wire that rotates the standing base by being pushed and pulled in the insertion portion;
A rotating lever that is rotatably incorporated in an operation unit connected to the proximal end side of the insertion unit, and the other end of the standing wire is locked to one end;
Screwed into a female screw provided in the operation portion, the tip is linked to the other end of the rotary lever, and the operation member disposed outside the operation portion is integrally provided at the rear end, An endoscope comprising: a male screw member that rotates the rotating lever by moving forward and backward in the female screw.   The female screw is provided in a female screw member having a coarse pitch male screw having a coarser pitch than the male screw of the male screw member formed on the outer periphery, and the female screw member is provided in the rough portion provided in the operation portion. 11. The internal view according to claim 10, wherein the rotary lever is rotated via the male screw member when it is screwed into the pitch female screw and is rotated by a second operation member provided integrally. mirror.

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