JPH0551314U - Forceps for cell collection - Google Patents

Abstract

(57) [Abstract] [Purpose] The strength of the movable part is increased and the cost is low, and the tissue is easily collected even in a narrow lumen. A cell-collecting forceps having a sheath portion 5 that can be inserted into a forceps channel of an endoscope is fixed to the distal end side of the sheath portion 5, a hole portion 9a communicating with the inside of the sheath, and a shaft 10 projecting forward. And a tip chip 9 having An operation wire 13 is inserted through the sheath portion 5, and an operation member 14 is provided at the tip of the operation wire 13 so as to be able to move forward and backward in the hole 9a of the tip. One ends of links 16 and 17 are rotatably supported by the operating member 14, and the cups 11 and 1 are attached to the other ends of the links 16 and 17, respectively.
The ends of the two arms 11a and 12a are pivotally supported, and the arm 1
Opening / closing fulcrums of 1a and 12a are pivotally supported by the shaft 10 of the tip 9. The actuating member 14 has a diameter smaller than the inner diameter of the hole 9a so as to be swingably displaced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cell-collecting forceps that is inserted into a forceps channel of an endoscope to collect cells in a body cavity.

[0002]

[Prior Art]

 Generally, in order to collect a tissue in a thin lumen such as a bile duct or a pancreatic duct, a forceps is inserted into a forceps channel of an endoscope so that the forceps protrudes from the tip of the endoscope. Insert into the pancreatic duct, open and close the tip cup, and collect the tissue. At that time, it is also necessary to inject a liquid contrast agent in order to confirm the morphology of the bile duct or pancreatic duct by X-ray.

Since the bile duct and pancreatic duct are very thin, even if the above-mentioned forceps cup is opened in the bile duct or pancreatic duct, the cup 51 opens only in the longitudinal direction of the lumen, as shown in FIG. As described above, since the cup 51 does not open toward the lumen wall and does not open, the lumen wall is not squeezed well and it is difficult to collect the tissue of the lumen wall.

Therefore, there is an improvement made for such a procedure, and Japanese Utility Model Publication No. 62-14806 discloses that the cup of the forceps swings.

[0005]

[Problems to be solved by the device]

 However, in the structure disclosed in Japanese Utility Model Publication No. 62-14806, since the cup oscillates, it is possible to collect tissue even in a narrow lumen. Metal fittings are required. Therefore, the forceps cannot be constructed at a low cost because it takes time and labor to process the moving metal fitting or it is difficult to process the parts. In addition, since it is necessary to open a large shaft hole, there are problems such as being large in size for maintaining the strength of the moving bracket and not being sufficiently strong for downsizing.

[0006] The present invention has been made in view of these circumstances, and has a cell-collecting forceps that can strengthen the strength of a movable part and can be inexpensively configured and can easily collect a tissue even in a narrow lumen. Is intended to provide.

[0007]

[Means for Solving the Problems]

 The forceps for cell collection according to the present invention includes a sheath portion that can be inserted into a forceps channel of an endoscope, a hole portion that is fixed to the distal end side of the sheath portion and that communicates with the inside of the sheath, and a support portion that protrudes forward. A distal tip having the operation wire inserted through the sheath portion is fixed to the distal end portion of the operation wire, and the distal end hole portion of the distal tip hole portion is configured to be movable back and forth in the hole portion of the distal tip portion and to be swingably displaced. An operating member having a diameter smaller than the inner diameter, a pair of links whose one end is rotatably supported by the operating member, a cup body for opening and closing to collect tissue, and an arm connected to the cup body. And an end portion of the arm opposite to the cup is pivotally supported to the other ends of the pair of links, respectively, and an opening / closing fulcrum portion of the arm is pivotally supported to a support portion of the tip chip. With a pair of cups .

[0008]

[Action]

 The actuating member has a diameter smaller than the inner diameter of the tip tip hole, and is oscillated and displaced by external stress. As a result, the pair of links, one end of which is pivotally supported by the operating member, and the arm, which is pivotally supported by the other end of the link, are displaced, and the cup swings.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 relate to a first embodiment of the present invention. FIG. 1 is a cross-sectional view showing a structure in the vicinity of a distal end treatment portion of a forceps for collecting cells, and FIG. 2 is a cup opened in the forceps shown in FIG. FIG. 4 is a cross-sectional view showing the state, FIG. 3 is an explanatory view showing the overall structure of the cell-collecting forceps, and FIG.

As shown in FIG. 3, the cell-collecting forceps 1 includes an elongated insertion portion 2 that can be inserted into a forceps channel of an endoscope, and a proximal-side operation portion 3 connected to the insertion portion 2. It is equipped with and. The insertion section 2 is composed of a distal treatment section 4 provided on the distal side for collecting tissue, and a flexible sheath section 5 connected to the distal treatment section 4. The operation unit 3 is composed of an operation unit body 6 for operating forceps, and a liquid delivery mouthpiece unit 7 for delivering a liquid contrast agent or the like to be injected for confirmation by X-ray. A slider 8 for gripping and operating forceps is provided on the proximal side of the operation section body 6. The slider 8 is provided to be movable back and forth with respect to the operation section body 6.

Next, a detailed configuration of the distal treatment section 4 will be described with reference to FIGS. 1 and 2. The distal treatment section 4 is provided with a distal tip 9 which is a distal end main body, and is fixed to the distal end side of the sheath portion 5. A shaft 10 that supports the cup (1) 11 and the cup (2) 12 is provided on the tip side of the tip chip 9. The cup (1) 11 and the cup (2) 12 have a cup body that opens and closes to collect tissues and the like, and arms 11a and 11b that are connected to the cup body. Opening / closing fulcrums of the arms 11a and 11b are rotatably supported on the shaft 10.

An operation wire 13 for transmitting an operation driving force to the distal treatment section 4 is fixed to the slider 8, and the operation wire 13 is inserted through the sheath section 5 of the insertion section 2. The operating member 14 is fixedly attached to the distal treatment section 4. The actuating member 14 is arranged so as to be able to move forward and backward within a hole 9a provided in the tip end chip 9, and has a shaft 15 on the tip end side. One ends of a link (1) 16 and a link (2) 17 are rotatably supported on the shaft 15. The other ends of the link (1) 16 and the link (2) 17 are rotatably supported by shafts 18 and 19 at the rear ends of the arms 11a and 11b, respectively.

On the other hand, the sheath portion 5 is composed of a coil sheath 21, and the coil sheath 21 is covered with a tube 22. The end of the coil sheath 21 on the proximal side is fixed to the liquid delivery mouthpiece 7, and the end on the distal side is fixed to the distal tip 9. A step 21a is provided at the tip of the coil sheath 21 so that the coil sheath 21 is fitted and fixed in the recess 9b of the tip 9. Here, if the length of the step 21a is L and the depth of the recess 9b is M, the relationship of L> M is satisfied. As a result, no gap is created between the tip of the coil case 21 and the tip tip recessed portion 9b, so that solder or the like used for fixing does not flow out to the inner circumference of the coil sheath, and malfunctions such as malfunctions can be prevented.

Further, the outer diameter of the operating member 14 is smaller than the inner diameter of the distal tip 9 or the inner diameter of the coil sheath 21 by about 2 mm or more, so that the operating member 14 can move forward and backward in the distal tip 9 and can swing. It is configured to be displaceable and to be able to deliver a contrast agent or the like through the tip 9. Furthermore, the coil sheath 21 is coiled by a coil winder or the like, and then heat treated under the conditions of 300 ° C. or less and an atmosphere of an inert gas (argon gas, nitrogen gas, etc.) for 30 minutes or less. .. By performing the heat treatment in this way, the residual stress of the coil sheath 21 can be removed, and the sheath can be made less likely to be colored during the heat treatment, and the operating force for advancing and retracting the operation wire 13 can be reduced.

The liquid delivery mouthpiece portion 7 is configured as shown in FIG. The sheath portion 5 side is connected to the coil sheath 21 and the tube 22 as described above, and the operation wire 13 is inserted therethrough. The proximal side of the liquid delivery mouthpiece 7 is connected to the operation portion main body 6 by meshing with a screw portion 7a. An O-ring 23 is provided on the rear end side of this meshed portion, that is, between the rear end of the liquid delivery mouthpiece 7 and the recess inside the operation portion main body 6. An operating pipe 24 is covered and fixed to the operation wire 13, and the operating pipe 24 is slidably provided in the O-ring 23. Although not shown, the operation wire 13 and the rear end side of the operation pipe 24 are fixed to the slider 8. Further, a hole 25 is provided in the operation portion main body 6 on the rear end side of the O ring 23 so that a lubricant such as silicon oil can be injected.

Next, the operation of this embodiment will be described. By inserting the insertion portion 2 into the bile duct and the pancreatic duct and operating the slider 8, the operating wire 13 advances forward and the shaft 15 of the operating member is displaced forward, and the link (1) 16, link (2) ) 17 opens. As a result, the arms 11a and 11b are displaced and the cup (1) 11 and the cup (2) 12 are opened. When the insertion portion 2 is pushed in as it is, either the cup (1) 11 or the cup (2) 12 is caught on the bile duct wall or the pancreatic duct wall, and as shown in FIG. Since it is smaller than 9a, the actuating member 14 is shaken at an angle, and the cup (1) 11 and the cup (2) 12 swing to face the wall. In this state, the slider 8 is operated to retract the operation wire 13, and the cup (1) 11 and the cup (2) 12 are closed, so that the tissue can be collected. In this way, the outer diameter of the operating member 14 is made sufficiently smaller than the inner diameter of the tip 9 so that the operating member 14 can be oscillated and displaced, and the movement of the operating member 14 causes the cup (1) 11, The cup (2) 12 can be rocked so as to contact the target tissue, and the tissue can be reliably grasped.

Further, when it is desired to check the progress of the forceps in the bile duct or pancreatic duct, a cylinder (not shown) is connected to the liquid delivery mouthpiece portion 7, and a contrast agent is injected from this cylinder through the liquid delivery mouthpiece portion 7. Then, the contrast agent passes through the coil sheath 21 and is injected into the bile duct or pancreatic duct through the gap between the operating member 14 and the tip 9. At this time, when the actuating member 14 and the cup (1) 11 and the cup (2) 12 swing, a gap is created in the same direction as the cup, so that the liquid is delivered to the target site for performing the procedure. .. As described above, conventionally, the outer diameter of the actuating member 14 and the inner diameter of the tip 9 are configured to be substantially the same diameter, so that the contrast agent or the like cannot be delivered. Liquid can be sent from the gap between the tip 9 and the X-ray, and the progress of the forceps in the bile duct or pancreatic duct can be confirmed. Further, the inside of the coil sheath 21 can be washed by injecting water or a washing liquid instead of the contrast agent at the time of washing. Further, when the lubricity of the O-ring 23 is lost due to washing, and the operation of the operation wire 13 becomes heavy, the lubrication of the O-ring 23 is injected by injecting the lubricant from the hole 25 of the operation section body 6. Try to keep

As described above, according to this embodiment, the actuating member 14 has the tip 9 so that the shaft 15 supporting the link (1) 16 and the link (2) 17 is disengaged from the central axis of the forceps. Since the cup (1) 11 and the cup (2) 12 are oscillated and displaced obliquely with respect to the tissue, the tissue can be easily and surely collected even in a narrow lumen, and the inspection can be performed. Certainty increases. Further, since the operating member 14 and the like do not have a complicated structure and it is not necessary to open a large shaft hole, processing can be performed easily and at a low cost, and strength can be kept strong in a compact size. Further, since the contrast agent can be injected, the insertion state of the forceps can be easily confirmed, which can shorten the examination time and reduce the burden on the patient.

FIG. 5 is an explanatory view showing the structure of the distal treatment section of the forceps for cell collection according to the second embodiment of the present invention.

In the second embodiment, a projection 31 is provided on the tip of the cup (1) 11 of the tip treatment section 4. Further, a concave portion 32 with which the protrusion 31 meshes is provided at the tip of the cup (2) 12. Others are the same as those in the first embodiment.

The protrusions 31 and the recesses 32 of the cups (1) 11 and (2) 12 make it easier for the cup to be caught by the bile duct wall or the pancreatic duct wall when collecting tissue. Therefore, since the protrusions 31 and the recesses 32 are provided, the cups (1) 11 and (2) 12 can easily grasp the target tissue, and the tissue can be collected more reliably. Other functions and effects are similar to those of the first embodiment.

[0022]

[Effect of the device]

 As described above, according to the present invention, the outer diameter of the actuating member is reduced so that the actuating member is oscillatingly displaced relative to the tip, and the cup is swung by the movement of the actuating member. In addition, the strength of the movable part can be increased and the cost can be reduced, and the tissue can be easily collected even in a narrow lumen.

[Brief description of drawings]

1 to 4 relate to a first embodiment of the present invention,
FIG. 1 is a cross-sectional view showing the configuration in the vicinity of the distal treatment portion of the forceps for cell collection.

FIG. 2 is a cross-sectional view showing a state in which the cup is opened in the forceps shown in FIG.

FIG. 3 is an explanatory diagram showing the overall configuration of the forceps for cell collection.

FIG. 4 is a cross-sectional view showing the configuration in the vicinity of the liquid delivery mouthpiece.

FIG. 5 is an explanatory view showing the configuration of the distal treatment section of the forceps for cell collection according to the second embodiment of the present invention.

FIG. 6 is an explanatory view showing a state of collecting tissue using conventional forceps.

[Explanation of symbols]

 2 ... Insertion part 3 ... Operation part 4 ... Tip treatment part 5 ... Sheath part 7 ... Liquid delivery mouth part 9 ... Tip tip 10, 15, 18, 19 ... Shaft 11, 12 ... Cup 13 ... Operation wire 14 ... Operating member 16 , 17 ... Link 21 ... Coil sheath 22 ... Tube

 ─────────────────────────────────────────────────── ─── Continued front page (72) Yukio Sato 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Tatsuya Saito 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Yutaka Yanuma 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd. (72) Takeaki Nakamura 2-43 Hatagaya, Shibuya-ku, Tokyo No. 2 Olympus Optical Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A distal end tip having a sheath portion that can be inserted into a forceps channel of an endoscope, a hole portion that is fixed to the distal end side of the sheath portion and that communicates with the inside of the sheath portion, and a support portion that projects forward. An operation wire inserted through the sheath portion; and an inner diameter of the distal tip hole portion that is fixed to the distal end portion of the operation wire and is capable of advancing and retracting in the hole portion of the distal tip and swingable. An actuating member having a reduced diameter, a pair of links having one end rotatably supported by the actuating member, a cup body for opening and closing to collect tissue, and an arm connected to the cup body, A pair of cups in which an end portion of the arm opposite to the cup is rotatably supported to the other ends of the pair of links, and an opening / closing fulcrum portion of the arm is rotatably rotatably supported on a support portion of the tip chip. For cell collection characterized by forceps.