JP2012045155A - Endoscope system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent dispersion of body fluid or the like stuck to a treatment instrument when taking out the treatment instrument from a proximal operation section.SOLUTION: A male screw section 50 is formed at a flexible cord section 41 of a treatment instrument 11. A female screw section 55 to be threadedly engaged with the male screw section 50 is formed at a forceps plug 36 of the proximal operation section 12 of an endoscope. When the treatment instrument 11 is used, the male screw section 50 is rotated to be inserted. When the treatment instrument 11 is pulled out after finishing the treatment, the male screw section 50 is locked to the female screw section 55 of the forceps plug 36 to temporarily stop the pullout operation of the treatment instrument 11. After that, the treatment instrument 11 is rotated to threadedly engage the male screw section 50 with the female screw section 55, and the treatment instrument 11 is slowly pulled out from the forceps plug 36. The treatment instrument 11 is thus eliminated from being vigorously pulled out when demounting, thereby preventing the dispersion of the body fluid or the like stuck to the treatment instrument 11.

Description

  The present invention relates to an endoscope system having an endoscope and a treatment tool.

  Conventionally, medical endoscopes are configured not only to observe the state of the body but also to collect tissue cells or perform predetermined treatment when a lesion or the like is present in the body. ing. For example, in order to insert a treatment tool into the body under the control of the endoscope, the endoscope is provided with a treatment tool insertion channel for inserting forceps and other treatment tools into the insertion portion. The proximal end portion of the treatment instrument insertion channel communicates with a treatment instrument introduction section provided in the main body operation section, and the distal end opens as a treatment instrument outlet with the observation section provided on the distal end surface and the distal side surface of the insertion section. ing.

  The treatment tool inserted through the endoscope is provided with an operating part at the tip of a flexible cord, and the operating part is constituted by, for example, a forceps operating part, a high-frequency knife, a snare wire or the like. The treatment instrument is inserted into the treatment instrument insertion channel from the treatment instrument introduction section, but does not enter the observation field of view by the observation section until it is led out from the treatment instrument outlet at the distal end of the insertion section.

  Therefore, when the treatment instrument reaches a predetermined position in the treatment instrument insertion channel, in order to make it recognized by the operator who operates the endoscope, a scale, a sign, and a sign on the outer surface of the flexible cord of the treatment instrument. Japanese Patent Application Laid-Open No. H10-228707 discloses a configuration in which a display unit including an uneven portion or the like is provided. Further, instead of the display portion provided on the outer surface of the flexible cord, an uneven portion is formed at a predetermined position of the flexible cord, and the treatment instrument is inserted into a forceps channel (treatment instrument insertion channel), or When pulling out from the forceps channel, the change in state of the rugged portion of the flexible cord passing through the forceps plug causes the operator to feel that the flexible cord has passed through a predetermined position in the forceps channel. A configuration that allows recognition is disclosed in Patent Document 2.

  As a result, for example, when the treatment tool is extracted from the forceps channel, the state change portion described above is withdrawn vigorously until it reaches the position of the forceps plug, and the operation feel recognizes that the state change portion has reached the position of the forceps plug. After that, it is possible to perform an operation of slowly extracting, thereby preventing the occurrence of a situation in which the distal end of the treatment instrument jumps out of the forceps channel and scatters body fluid or the like around.

  In addition, when the treatment tool is inserted from the forceps channel, the resistance is small and easy, and the resistance increases when the treatment tool is pulled out of the forceps channel. This is disclosed in Patent Document 3.

Japanese Patent Laid-Open No. 11-309153 Japanese Patent Laid-Open No. 10-137256 JP 2007-289580 A

  However, like the treatment tools described in Patent Documents 2 and 3, the flexible cord is formed with concave portions and convex portions, and the diameter difference between the concave portions and convex portions and other portions is given. Even if the concave and convex portions cause a remarkable change in the feeling when passing through the forceps plug and have a clear difference in the operational feeling, there are individual differences in the sense of the operator. For this reason, the treatment tool cannot be recognized by the operation feeling, and the treatment tool may be excessively extracted from the operation unit during the extraction process, and an improvement has been desired.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an endoscope system that prevents the treatment tool from being excessively removed when the treatment tool is removed from the operation unit. And

  The present invention includes an endoscope having a treatment instrument inlet communicating with a treatment instrument insertion channel disposed in an insertion section in an operation section, and a treatment instrument inserted from the treatment instrument inlet into the treatment instrument insertion channel. The endoscope system is characterized by having an engaging portion that engages with an outer peripheral surface of a distal end portion of the treatment instrument when the treatment instrument is extracted from the treatment instrument inlet.

  The locking portion is a male screw portion formed on the outer peripheral surface of the distal end portion of the treatment instrument, and the male screw portion at the time of extraction is locked to a treatment instrument passage of a plug member attached to the treatment instrument inlet. preferable. The locking portion is formed in a male screw portion formed on the outer peripheral surface of the distal end portion of the treatment instrument and a treatment screw passage of a plug member attached to the treatment instrument inlet, and a female screw portion into which the male screw portion is screwed. It is preferable to have.

  The locking portion includes a protrusion formed on the outer peripheral surface of the distal end portion of the treatment instrument, a spiral groove formed in a treatment instrument passage of a plug member attached to the treatment instrument inlet, and through which the protrusion passes. It is preferable to have. The locking portion is formed in a protrusion formed on the outer peripheral surface of the distal end portion of the treatment instrument and a treatment instrument passage of a plug member attached to the treatment instrument inlet, and is positioned in the circumferential direction of the treatment instrument passage. It is preferable to have a crank-shaped groove that includes a straight portion extending along the axial direction and a circumferential portion that connects between the straight portions, and through which the protrusion passes.

  Moreover, it is preferable that the said latching | locking part is comprised from the ring-shaped holding member holding the outer peripheral surface of the said treatment tool, and the connection member which connects this ring-shaped holding member to the said treatment tool inlet_port | entrance. The ring-shaped holding member is displaceable between a holding state for holding the outer peripheral surface of the treatment instrument and an open state for releasing the holding, and is preferably set to a holding state when the treatment instrument is in use. .

  According to the present invention, when the treatment instrument is extracted from the treatment instrument inlet, the distal end portion of the treatment instrument is locked by the engagement portion because the engagement portion is engaged with the outer peripheral surface of the distal end portion of the treatment instrument. Therefore, the treatment instrument is not pulled out from the treatment instrument entrance with excessive momentum. Therefore, the distal end portion of the treatment instrument does not jump off from the treatment instrument entrance and the body fluid or the like adhering to the treatment instrument is not scattered around.

It is explanatory drawing which shows the structure of an endoscope system roughly. It is a perspective view which shows the latching | locking part of the state which inserted the treatment tool in the forceps plug of the insertion part of an endoscope. It is sectional drawing around the forceps stopper which shows the latching | locking part of another embodiment which a male screw part latches to a stopper main body. It is sectional drawing around the forceps stopper which shows the latching | locking part of another embodiment which provided the internal thread part on the upper and lower sides of the treatment tool holding | maintenance part. It is sectional drawing around the forceps stopper which shows the latching | locking part of another embodiment which provided the spiral groove | channel in the treatment tool channel | path. It is sectional drawing around the forceps stopper which shows the latching | locking part of another embodiment which provided the crank-shaped groove | channel in the treatment tool channel | path. It is a perspective view around a forceps stopper showing a locking ring of another embodiment. It is a top view which shows the latching ring set to the latching position. It is a top view which shows the latching ring set to the retracted position. It is a top view which shows the locking ring of another embodiment set to the locking position. It is a top view which shows the locking ring of another embodiment set to the retracted position.

  In FIG. 1, an endoscope system 2 includes an endoscope 10 and an endoscope treatment tool (hereinafter referred to as a treatment tool) 11. The endoscope 10 includes a hand operation unit 12 and an insertion unit 13. A universal cord 15 is connected to the hand operation unit 12. The universal cord 15 is detachably connected to the light source device 19 and the processor device 20 via the light source connector 16, the cable 17, and the processor connector 18, respectively.

  The hand operating unit 12 is provided with an angle knob 21, an air / water supply button 22, a suction button 23, and the like. A forceps port 24 through which various treatment instruments 11 are inserted is provided on the insertion unit 13 side of the hand operation unit 12.

  The insertion unit 13 is connected to the hand operation unit 12 and is inserted into the body of the subject. The insertion portion 13 includes a flexible flexible portion 25, a bendable bending portion 26, and a distal end rigid portion 27 in order from the hand operating portion 12 side. The soft part 25 has a length of about 1.3 m to 1.6 m in order to allow the distal end hard part 27 to reach a target position in the body. The bending portion 26 bends in the vertical and horizontal directions in conjunction with the operation of the angle knob 21 of the hand operation unit 12. Thereby, the front-end | tip hard part 27 can be orient | assigned to the desired direction in a body.

  As is well known, a forceps outlet 30 is provided on the distal end surface of the distal rigid portion 27 in addition to an observation window, an illumination window, and an air / water feeding nozzle (both not shown). An imaging device such as an objective optical system, a CCD, or a CMOS image sensor is arranged in the back of the observation window. An imaging signal from the imaging element is sent to the processor device 20 via the universal code 15 or the like. The processor device 20 performs various image processing on the image pickup signal of the image pickup device to convert it into a video signal, and displays it as an observation image on the monitor 31 connected with the cable.

  In the illumination window, an exit end of a light guide that guides illumination light from an irradiation light source of the light source device 19 is arranged. Illumination light from the illumination window is emitted toward the observation site in the body. The air / water supply nozzle injects air and water supplied from the air / water supply device built in the light source device 19 toward the observation window in accordance with the operation of the air / water supply button. The forceps outlet 30 is connected to a forceps channel (treatment instrument insertion channel) 35 disposed in the insertion portion 13 and communicates with the forceps port 24. A forceps plug 36 made of an elastic material such as rubber or elastomer is attached to the forceps port 24.

  The treatment instrument 11 includes a forceps operating portion 40, a flexible cord portion 41, and an actuator portion 42 in order from the distal end. The forceps operating unit 40 is composed of a pair of gripping claws 40 a and 40 b and is opened and closed by a link mechanism 43. The link mechanism 43 is driven by the actuator unit 42. Instead of the actuator portion 42, a handle portion having a slider mechanism may be used. Further, the treatment instrument 11 may have a high-frequency knife, a snare wire, a syringe, a biopsy collection cup, and the like in addition to the one having the forceps operating unit 40.

  As shown in FIG. 2, a locking portion 51 including a male screw portion 50 is formed in the flexible cord portion 41 near the forceps operating portion 40 of the treatment instrument 11. The male screw portion 50 is formed by raising the surface of the flexible cord portion 41. The length of the male screw portion 50 is preferably 1 to 2 pitches from the viewpoint of the rotation operation during insertion or extraction, but may be longer than that.

  The forceps plug 36 is formed with a female screw portion 55 that is screwed into the male screw portion 50 so as to correspond to the locking portion 51, and a tapered inner peripheral surface 56. Further, a cap 60 is integrally provided on the forceps plug 36 via a connection belt 61, and when not in use, the plug body 60a of the cap 60 is fitted into the forceps port 62 to close the forceps port 62.

  In use, the cap 60 of the forceps plug 36 is removed from the forceps port 62, the distal end of the treatment tool 11 is inserted into the forceps port 62, and the male screw part 50 and the female screw part 55 are rotated in the screwing direction. The tool 11 can be inserted into the forceps plug 36. After that, the distal end surface of the insertion portion 13 is positioned at a predetermined portion of the subject by a normal insertion operation, and the lesioned part or foreign matter is removed by the forceps operating portion 40. After completing the predetermined treatment, the treatment instrument 11 is extracted from the hand operation unit 12.

  In this extraction operation, when the forceps actuating portion 40 that is the distal end portion of the treatment instrument 11 reaches near the forceps opening 62, the male screw portion 50 is locked to the female screw portion 55, and the extraction operation is temporarily interrupted. The Thereafter, the treatment instrument 11 can be slowly removed from the forceps plug 36 by rotating the treatment instrument 11 and screwing the male screw portion 50 and the female screw portion 55 together. As described above, since the extraction operation from the forceps plug 36 of the treatment instrument 11 is performed through the screwing of the male screw portion 50 and the female screw portion 55, the treatment instrument 11 is withdrawn from the forceps plug 36 with a surplus force as in the related art. Thus, the distal end portion of the treatment instrument 11 does not jump off from the forceps port 62. Therefore, the body fluid or the like adhering to the treatment instrument 11 is not scattered around.

  In the above embodiment, the female screw part 55 that is screwed into the male screw part 50 is provided in the forceps plug 36, but the female screw part 55 may be omitted as shown in FIG. In this case, a plug body 71 is formed that is in close contact with the forceps plug 70. The plug body 71 is made of an elastic body such as rubber or elastomer. At the time of use, the distal end portion of the treatment instrument 11 is pressed against the plug body 71 and rotated so that the male screw portion 50 enters the contact portion 71a of the plug body 71 and the forceps operating portion 40 is inserted. After the treatment instrument 11 is used, since the male screw portion 50 is locked to the plug body 71, the extraction operation is temporarily interrupted. Thereafter, the treatment instrument 11 can be slowly removed from the forceps plug 70 by rotating the male screw part 50 in the direction of extracting the male screw part 50 by the propelling action by the spiral of the male screw part 50. As described above, since the extraction operation is temporarily interrupted by the engagement between the male screw portion 50 and the plug main body 71, the forceps operating portion 40, which is the distal end portion of the treatment instrument, can be extracted from the forceps plug 70. The body fluid adhering to the treatment instrument 11 can be prevented from being scattered.

  As shown in FIG. 4, female screw portions 76 and 77 to be screwed into the male screw portion 50 are provided above and below a treatment tool holding portion 75 having a diameter substantially the same as the outer diameter of the flexible cord portion 41 of the treatment tool 11. It may be provided. In this case, since the space between the forceps plug 79 and the treatment instrument 11 is kept watertight by the treatment instrument holding portion 75, body fluid and the like will not leak. Further, since the female screw portions 76 and 77 provided on the upper and lower sides are screwed into the male screw portion 50, the treatment instrument holding portion 75 is driven by the spiral action of the male screw portion 50 by rotating the treatment instrument 11. The treatment instrument 11 can be easily inserted and removed. In addition, although the external thread part 50 was formed in the flexible cord part 41, you may form the external thread part 50 in the outer peripheral surface of the forceps action | operation part 40. FIG.

  Further, as shown in FIG. 5, a forceps plug 82 having a spiral groove 81 provided in a treatment instrument holding portion (treatment instrument passage) 80 having a diameter substantially the same as the outer diameter of the flexible cord portion 41 of the treatment instrument 11 is provided. In addition, the flexible cord portion 41 of the treatment instrument 11 may be provided with a locking portion 84 that protrudes from the outer peripheral surface in the vicinity of the forceps operating portion 40 and includes a protruding portion 83 that passes through the groove 81. In this case, the spiral groove 81 is formed in communication with the upper end edge 80a and the lower end edge 80b of the treatment instrument holding unit 80. As a result, during the extraction operation of the treatment instrument 11, the projection 83 is locked to the lower end edge 80b of the treatment instrument holding unit 80 or the lower end portion of the groove 81, and the extraction operation is temporarily interrupted. Thereafter, when the treatment instrument 11 is rotated, the projection 83 can pass through the groove 81, so that the treatment instrument 11 can be slowly removed from the forceps plug 82.

  Furthermore, as shown in FIG. 6, a forceps plug 87 in which a crank-shaped groove 86 is provided in a treatment instrument holding portion (treatment instrument passage) 85 having a diameter substantially the same as the outer diameter of the flexible cord portion 41 of the treatment instrument 11. The flexible cord portion 41 of the treatment instrument 11 may be provided with a locking portion 89 including a protrusion 88 that passes through the groove 86 near the forceps operating portion 40. In this case, the crank-shaped groove 86 connects the upper and lower straight portions 86a and 86b that are displaced in the circumferential direction of the treatment instrument holding portion 85 and extend in the axial direction, and the straight portions 86a and 86b. The projecting portion 88 includes a circumferential portion 86c extending along the circumferential direction, and the protrusion 88 is vertically aligned with the width direction (circumferential direction of the flexible cord 41) in accordance with the width of the linear portions 86a and 86b of the groove 86. The dimension in the direction (the axial direction of the flexible cord 41) is formed in accordance with the width of the circumferential portion 86c of the groove 86. Thereby, at the time of the extraction operation of the treatment instrument 11, the projection 88 is locked to the lower end edge of the treatment instrument holding portion 85 or the circumferential portion 86c of the groove 86, and the extraction operation is temporarily interrupted. When the projection 88 is locked to the lower end edge of the treatment instrument holding portion 85, the projection 88 enters the linear portion 86b of the groove 86 by rotating the treatment instrument 11, and further communicates with the linear portion 86b. Locked to the circumferential portion 86c. And when the projection part 88 is latched by the circumferential part 86c of the groove | channel 86, if the treatment tool 11 is rotated, the projection part 83 will pass the circumferential part 86c and will approach into the linear part 86a. As described above, the treatment tool 11 can be slowly extracted from the forceps plug 36 by the protrusion 88 passing through the crank-shaped groove 86.

  Next, as shown in FIGS. 7 to 9, another embodiment using a locking ring 91 as the locking portion 90 will be described. A locking ring 91 is formed integrally with the forceps plug 92 separately from the cap 93. The locking ring 91 has a ring main body 95 and a locking piece 97 that changes the inner diameter of the ring main body 95 to change the extraction resistance of the treatment instrument 11 inserted into the ring main body 95.

  As shown in FIG. 8, when the locking piece 97 gets over the stopper 98 formed on the ring main body 95, the inner diameter of the ring main body 95 is reduced, and the outer peripheral surface of the treatment instrument 11 is tightened. Set to the locking position. As shown in FIG. 7, when the locking piece 97 is moved away from the locking position and retracted, the locking tool 97 is loosely held by the locking ring 91. A stopper 98 is formed on the ring body 95 between the locking position and the non-locking position, and the locking piece 97 is selectively positioned at the locking position or the non-locking position by the stopper 98. The

  As shown in FIG. 7, when using the treatment instrument 11, the cap 93 is removed from the forceps plug 92 and the main body of the ring body 95 is positioned above the forceps port 99. At this time, the locking piece 97 is set in the non-locking position, and the forceps operating portion 40 that is the distal end portion of the treatment instrument is inserted into the forceps opening 99.

  After the treatment instrument 11 is set on the hand operation portion 12, the locking piece 97 of the locking ring 91 is set from the non-locking position shown in FIG. 9 to the locking position shown in FIG. As shown in FIG. 7, when the predetermined treatment is completed and the treatment instrument 11 is removed from the forceps plug 92, the engagement ring 91 set at the engagement position securely engages the distal end portion of the treatment instrument. Therefore, even when the forceps plug 92 is pulled out, the distal end portion of the treatment instrument is held by the locking ring 91. Therefore, the treatment tool 11 is not momentarily pulled out from the forceps plug 92, and body fluid attached to the treatment tool 11 is not scattered.

  As shown in FIG. 7, the locking ring 91 and the cap 93 are provided separately on the forceps plug 92, but the locking ring 91 and the cap 93 may be provided side by side using a belt member 96. .

  In addition to the locking ring 91 that is switched between the locking position and the non-locking position by the locking piece 97 as shown in FIGS. 7 to 9, as shown in FIGS. The locking portion 103 may be configured using the locking ring 101. In this case, the locking ring 101 is attached to the forceps plug by the belt member 102. The locking ring 101 includes a convex portion 104 and a concave portion 105 at the tip. As shown in FIG. 10, when the convex portion 104 and the concave portion 105 are fitted, the locking ring 101 is closed and set to a locking position for locking the treatment instrument 11. Moreover, as shown in FIG. 11, the latching ring 101 will be in an open position by canceling | releasing latching with the convex part 104 and the recessed part 105. As shown in FIG.

  As shown in FIG. 10, when the locking position is set by the hinge portion 100, the inner diameter of the locking ring 101 becomes small, and the treatment instrument is firmly held. Further, when the hinge portion 100 is set to the open position, the locking ring 101 is opened so that the treatment instrument can be easily inserted into the forceps plug.

  In each of the above embodiments, the locking portions 51, 84, 89 by the male screw portion 50 and the locking portions 90, 103 by the locking rings 91, 101 are implemented separately, but these may be performed simultaneously. . In the above-described embodiment, the electronic endoscope 10 is illustrated as an endoscope. However, other endoscopes such as an endoscope that employs an optical image guide to observe the state of the subject may be used.

2 Endoscope system 10 Endoscope 11 Treatment tool 12 Hand operating part 13 Insertion part 24, 62 Forceps port 36, 70, 79, 82, 87, 92 Forceps plug 50 Male thread part 51, 84, 89, 90, 103 Stop portions 55, 76, 77 Female thread portion 60 Cap 71 Plug body 75 Treatment instrument holding portion 91 Lock ring 93 Cap 95 Ring body 98 Stopper 100 Hinge portion 101 Lock ring

Claims (7)

An endoscope system having an endoscope having a treatment instrument inlet communicating with a treatment instrument insertion channel disposed in an insertion section in an operation section and a treatment instrument inserted from the treatment instrument inlet into the treatment instrument insertion channel. There,
An endoscope system comprising a locking portion that locks to an outer peripheral surface of a distal end portion of the treatment instrument when the treatment instrument is extracted from the treatment instrument inlet. The locking portion is a male screw portion formed on the outer peripheral surface of the distal end portion of the treatment instrument,
The endoscope system according to claim 1, wherein the male screw portion at the time of extraction is engaged with a treatment instrument passage of a plug member attached to the treatment instrument inlet. The locking portion is a male screw portion formed on the outer peripheral surface of the distal end portion of the treatment instrument,
The endoscope system according to claim 1, further comprising: a female screw portion formed in a treatment tool passage of a plug member attached to the treatment tool inlet and into which the male screw portion is screwed. The locking portion is a protrusion formed on the outer peripheral surface of the distal end portion of the treatment instrument;
The endoscope system according to claim 1, further comprising: a spiral groove formed in a treatment instrument passage of a plug member attached to the treatment instrument inlet and through which the protrusion passes. The locking portion is a protrusion formed on the outer peripheral surface of the distal end portion of the treatment instrument;
A linear portion formed in a treatment instrument passage of a plug member attached to the treatment instrument inlet, shifted in the circumferential direction of the treatment instrument passage and extending along the axial direction, and a circumferential portion connecting between the linear portions; The endoscope system according to claim 1, further comprising a crank-shaped groove through which the protrusion passes.   The said latching | locking part is comprised from the ring-shaped holding member holding the outer peripheral surface of the said treatment tool, and the connection member which connects this ring-shaped holding member to the said treatment tool inlet_port | entrance. Endoscope system.   The ring-shaped holding member is displaceable between a holding state for holding the outer peripheral surface of the treatment instrument and an open state for releasing the holding, and is set to a holding state when the treatment instrument is in use. The endoscope system according to claim 6.

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