Endoscopy

Abstract

The purpose of the present invention is to provide an endoscope that facilitates an operation for opening and closing a flow channel of a suction tube while holding and operating a handle. This endoscope comprises: a shaft (10) having a forceps channel (17) and a water supply channel (141, 142) formed therein; a handle (20) having a forceps port (27), a water supply port (24), and a suction port (26) formed therein; a suction tube (265) that is inserted through the suction port to the inside of the handle, extending through the inside of the handle, and that has a distal end that joins a communication channel between the forceps channel and the forceps port; and a water supply tube (245) that is inserted through the water supply port to the inside of the handle, extending through the inside of the handle, and that has a lumen in communication with the water supply channel. The handle is provided with a valve mechanism (80) for opening and closing a suction path of the suction tube.

Description

[Technical field]

[0001] The present invention relates to an endoscope, and more particularly to an endoscope having a shaft to be inserted into the body, an operating handle, and a camera. [Background technology]

[0002] Conventionally, as a small endoscope used for diagnosing and treating the bile duct, pancreatic duct, etc. via a duodenoscope, there is known an endoscope that is equipped with a shaft to be inserted into the body, an operating handle, and a camera (see Patent Document 1 below).

[0003] A shaft constituting an endoscope is usually formed with a forceps channel which also serves as a suction channel, and a water supply channel. The handle of the endoscope is provided with a forceps port, a water supply port, and a suction port.

[0004] The forceps port in the handle communicates with the forceps channel in the shaft. The biopsy forceps inserted from the forceps port are passed through the inside of the handle (the connecting passage between the forceps port and the forceps channel) and into the forceps channel of the shaft, and the tip of the biopsy forceps is extended into the body from the forceps opening, which is the opening of the forceps channel at the tip of the shaft.

[0005] The forceps port in the handle usually also serves as a medical fluid injection port. By injecting a liquid medicine from the forceps port, the liquid medicine flows through the inside of the handle (the communication passage) and the forceps channel of the shaft, and flows out from the forceps port to be administered into the body.

[0006] The water port in the handle communicates with the water channel in the shaft. Specifically, a water supply tube, the base end of which is connected to a water supply bottle, is inserted from the water supply port into the interior of the handle and extends through the interior of the handle, and the tip of the water supply tube is connected to a water supply channel in the shaft.

[0007] The water in the water bottle flows through the water supply tube and the water supply channel, and is discharged into the body through the water supply port, which is the opening of the water supply channel at the tip of the shaft. This cleans the tip of the shaft and its surroundings, and eliminates fogging of the camera lens.

[0008] The suction port of the handle communicates with the forceps channel and the forceps port (medicinal solution injection port) of the shaft. Specifically, a suction tube, the base end of which is connected to a suction pump, is inserted from the suction port into the handle and extends through the handle, and the tip of the suction tube is connected to a communication passage between the forceps channel and the forceps port.

[0009] By sealing the forceps port and activating the suction pump, the patient's bodily fluids around the tip of the shaft can flow from the forceps port into the forceps channel, through the forceps channel and suction tube, and out the suction port. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Patent No. 4764417 Summary of the Invention [Problem to be solved by the invention]

[0011] If a medicinal liquid is injected through the forceps port of the handle while the suction pump is operating, the injected medicinal liquid is sucked into the suction tube connected to the communication passage, and cannot flow through the forceps channel of the shaft and out of the forceps port.

[0012] In such a case, it may be possible to stop the suction pump when injecting the medicinal liquid from the forceps port, or to close the flow path of the suction tube that extends from the suction port to the outside of the handle and leads to the suction pump with a two-way or three-way stopcock.

[0013] However, it is not practical to stop the suction pump when injecting a liquid medicine. In addition, it is troublesome for an operator holding and operating the handle to close the flow path of the suction tube extending from the handle.

[0014] The present invention has been made based on the above circumstances. The object of the present invention is to provide an endoscope in which the suction flow path can be easily opened and closed using a suction tube while the handle is grasped and operated, and in which medicinal liquid injected from the forceps port in the handle can be reliably discharged from the forceps port at the tip of the shaft even while the suction pump is operating. [Means for solving the problem]

[0015] (1) The endoscope of the present invention comprises a shaft in which a forceps channel, which also serves as a suction channel, and a water supply channel are formed; a handle disposed on a proximal end side of the shaft and having a forceps port communicating with the forceps channel, a water supply port communicating with the water supply channel, and a suction port; a camera disposed within the shaft and the handle; a suction tube, the base end of which is connected to a suction means, which is inserted into the handle from the suction port and extends through the handle, and the tip of which joins a communication passage between the forceps channel and the forceps port; a water supply tube having a proximal end connected to a water supply means, the water supply tube being inserted from the water supply port into the handle and extending through the handle, the lumen of the water supply tube being in communication with the water supply channel; The handle is characterized by having a valve mechanism for opening and closing the suction flow path of the suction tube.

[0016] According to an endoscope having such a configuration, the handle is provided with a valve mechanism for opening and closing the suction flow path of the suction tube, so that the opening and closing operation can be easily performed while gripping the handle.

[0017] (2) In the endoscope of the present invention, it is preferable that the valve mechanism is configured to be in a “closed” state by pressing an outer circumferential surface of the suction tube to close the suction flow path.

[0018] (3) In the endoscope of (2) above, the valve mechanism comprises: a tube holding section disposed inside the handle and holding the suction tube (the portion whose outer circumferential surface is to be pressed) extending inside the handle at a predetermined position; a cylinder section attached or formed on the handle so as to communicate the inside and outside of the handle; and a pressing member that moves along the axial direction while rotating around the axis of the cylinder section, It is preferable that when the valve mechanism is in the "open" state, the tip of the pressing member is located inside the cylinder portion, and when the valve mechanism is in the "closed" state, the tip of the pressing member extends from the tip opening of the cylinder portion into the inside of the handle, and the tip surface of the pressing member presses the outer peripheral surface of the suction tube held by the tube holding portion.

[0019] With an endoscope having such a configuration, the pressing member constituting the valve mechanism in the "open" state is moved along the axial direction of the cylinder section while rotating around the axis of the cylinder section, so that the tip of the pressing member positioned (on standby) inside the cylinder section extends from the tip opening (opening on the inside side of the handle) of the cylinder section, and the tip surface of the pressing member presses against the outer peripheral surface of the suction tube held in the tube holding section, thereby blocking the suction flow path of the suction tube.

[0020] (4) In the endoscope according to the above (3), the pressing member comprises a shaft portion having a base end portion extending from a base end opening (an opening on the outer side of the handle) of the cylinder portion to the outside of the handle; an operating lever attached to the base end of the shaft portion for rotating the pressing member; a partial outer circumferential portion formed so as to cover a part of the outer circumferential surface of the shaft portion and having an outer circumferential surface slidable against the inner circumferential surface of the cylinder portion and a spiral base end surface slidable against an inner end surface (an inner end surface on a base end side) of the cylinder portion; The tip portion is integrally molded, It is preferable that by rotating the shaft portion using the operating lever, the base end surface of the partial outer periphery slides against the inner end surface of the cylinder portion, thereby causing the pressing member to move along the axial direction while rotating around the axis of the cylinder portion.

[0021] (5) In the endoscope described above in (4), it is preferable that the pressing member is configured to rotate substantially 90° around the axis of the cylinder portion while the valve mechanism goes from the “open” state to the “closed” state.

[0022] With an endoscope having such a configuration, the valve mechanism can be changed from an "open" or "closed" state to a "closed" or "open" state by rotating the pressing member 90° around the axis of the cylinder portion using the operating lever.

[0023] (6) In the endoscope described above in (3) to (5), it is preferable that the tip portion of the pressing member is annular.

[0024] According to an endoscope having such a configuration, the pressing force from the tip surface of the pressing member can be concentrated on the outer peripheral surface of the suction tube, so that the suction flow path of the suction tube can be blocked more reliably.

[0025] (7) In the endoscope described above in (3) to (6), it is preferable that the tube holding portion includes a flat plate portion having a flat surface facing the tip surface of the pressing member across the suction tube, and tube gripping portions formed on both sides of the flat plate portion.

[0026] With an endoscope having such a configuration, the suction tube (the portion whose outer surface is pressed) is grasped by the tube gripping portions formed on both sides of the flat plate portion, and the suction tube is clamped between the tip surface of the pressing member and the flat surface of the flat plate portion, thereby more reliably blocking the suction flow path of the suction tube.

[0027] (8) In the endoscope according to the above (7), at least a portion of the suction tube held by the tube holding portion extends inside the handle in parallel with the water supply tube, the tube holding portion has a partition portion formed of a protruding plate extending perpendicularly to the flat plate portion, It is preferable that the suction tube and the water supply tube are separated by the partition.

[0028] According to an endoscope having such a configuration, it is possible to prevent the distal end surface of the pressing member from pressing against the outer circumferential surface of the water supply tube. Effect of the Invention

[0029] According to the endoscope of the present invention, the opening and closing operation of the suction flow path of the suction tube can be easily performed while gripping the handle. This allows the valve mechanism to be in the "closed" state when injecting medicinal liquid from the forceps port of the handle while the suction pump is operating, ensuring that the injected medicinal liquid flows out of the forceps port at the tip of the shaft. [Brief description of the drawings]

[0030] [Figure 1] 1 is an explanatory diagram showing the appearance of an embodiment of an endoscope of the present invention; [Diagram 2] 2 is an explanatory diagram showing the inside of a handle of the endoscope shown in FIG. 1. [Diagram 3] 2 is a partial enlarged view (detailed view of part III) showing the tip portion of the endoscope shown in FIG. 1. [Figure 4A] FIG. 4 is a view taken along the line IVA-IVA in FIG. 3. [Figure 4B]FIG. 4 is a cross-sectional view taken along line IVB-IVB in FIG. 3 (a cross-sectional view of the shaft). [Figure 4C] FIG. 4 is a cross-sectional view (cross-sectional view of the distal tip) taken along the line IVC-IVC in FIG. 3. [Figure 4D] FIG. 4 is a cross-sectional view taken along line IVD-IVD in FIG. 3 (a cross-sectional view of an intermediate member). [Diagram 5] FIG. 2 is a cross-sectional view showing a schematic view of the inside of the camera head. [Figure 6A] 2 is a perspective view showing the tip portion of the endoscope shown in FIG. 1 (illustration of the camera is omitted). [Figure 6B] 2 is a perspective view showing the tip portion of the endoscope shown in FIG. 1 (illustration of the camera is omitted). [Figure 7A] 2 is a cross-sectional view showing a state in which a slide member of a camera connector constituting the endoscope shown in FIG. 1 is in a proximal position. [Figure 7B] 2 is a cross-sectional view showing a state in which a slide member of a camera connector constituting the endoscope shown in FIG. 1 is at a distal end position. [Figure 8A] 2 is a perspective view showing a state in which the distal end of a camera constituting the endoscope shown in FIG. 1 is located at a first position on the proximal side of the distal end surface of the distal tip. [Figure 8B] 2 is a perspective view showing a state in which the tip of a camera constituting the endoscope shown in FIG. 1 is in a second position on the distal side of the distal end surface of the distal tip. [Figure 9] 2 is a flow diagram showing a flow path of a medicinal liquid (passage of the forceps), a flow path for water supply, and a flow path for suction in the endoscope shown in FIG. 1. FIG. [Figure 10A] FIG. 4 is an explanatory diagram showing the position of the operating lever when the valve mechanism is in an "open" state. [Figure 10B] FIG. 4 is an explanatory diagram showing the position of the operating lever when the valve mechanism is in a "closed" state. [Figure 11A] 2 is an explanatory diagram showing an operating state of a valve mechanism of the endoscope shown in FIG. 1. [Figure 11B] 2 is an explanatory diagram showing an operating state of a valve mechanism of the endoscope shown in FIG. 1. [Figure 11C] 2 is an explanatory diagram showing an operating state of a valve mechanism of the endoscope shown in FIG. 1. [Figure 12] FIG. 4 is a perspective view of a pressing member that constitutes the valve mechanism. [Figure 13] FIG. 4 is a perspective view of a tube holding portion that constitutes the valve mechanism. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] <Embodiment> An embodiment of the present invention will be described. The endoscope 100 of this embodiment is inserted into the forceps lumen of a side-viewing endoscope such as a duodenoscope, and is used for diagnosing and treating diseases in the bile duct or pancreatic duct. The endoscope 100 has a flexible tip portion 10A, and is made of resin and has a camera channel 13, a forceps channel 17 which also serves as a suction channel, and two water supply channels 141 and 142 formed therein, and four wire lumens 151, 152, 153, and 154 formed therein; a handle 20 disposed on the base end side of the shaft 10, equipped with a rotating operation unit (operation knob 251 and operation knob 252), and having a camera port 23 communicating with the camera channel 13, a forceps port 27 communicating with the forceps channel 17, a water supply port 24 communicating with the water supply channels 141 and 142, and a suction port 26 formed therein; a resin tip tip 30 that is disposed at the tip side of the shaft 10, has the same outer diameter as the shaft 10, and is formed with a camera channel 33, water supply channels 341, 342 and a forceps channel 37 that communicate with the camera channel 13, water supply channels 141, 142 and forceps channel 17 of the shaft 10, respectively, and opens at a tip surface 35 of the tip tip tip 30; a metallic intermediate member 40, which is disposed between the shaft 10 and the distal tip 30, has a disk shape having the same outer diameter as the shaft 10, and has a main through hole 41 formed so as to surround all of the communication paths 43, 441, 442, 47 between the camera channel 13, the water supply channels 141, 142, and the forceps channel 17 of the shaft 10 and the camera channel 33, the water supply channels 341, 342, and the forceps channel 37 of the distal tip 30, and four auxiliary through holes 421, 422, 423, 424 formed corresponding to the formation positions of the wire lumens 151, 152, 153, 154 of the shaft 10; four operation wires 51, 52, 53, 54 each having a large diameter tip portion 511, 521, 531, 541 with a diameter larger than the diameter of the auxiliary through-holes 421, 422, 423, 424 of the intermediate member 40, each extending through the auxiliary through-holes 421, 422, 423, 424 to each of the wire lumens 151, 152, 153, 154 of the shaft 10, and each having a rear end fixed to a rotation operation portion (operation knob 25 or operation knob 26) of the handle 20 and operable by pulling; a camera 60 including a camera head 61 equipped with a CMOS image sensor 611 (imaging element) and a cable tube 62, incorporating a plurality of optical fibers 65, and being inserted into the camera channel 13 and the handle 20, thereby being detachably disposed with respect to the shaft 10 and the handle 20; a suction tube 265, the base end of which is connected to the suction pump 96, which is inserted into the handle 20 from the suction port 26 and extends through the handle 20, and the tip of which joins the communication passage between the forceps channel 17 and the forceps port 27; a water supply tube 245 having a base end connected to the water supply tank 94, inserted from the water supply port 24 into the handle 20 and extending through the handle 20, and a lumen thereof communicating with the water supply channels 141 and 142; The handle 20 is provided with a valve mechanism 80 that opens and closes the suction flow path through the suction tube 265 .

[0032] This endoscope 100 comprises a shaft 10 to be inserted into the body, a handle 20 arranged on the base end side of the shaft 10, a suction tube 265, a water supply tube 245, a distal tip 30 arranged on the distal end side of the shaft 10, an intermediate member 40 arranged between the shaft 10 and the distal tip 30, operating wires 51, 52, 53, 54, a camera 60, and a valve mechanism 80.

[0033] <Shaft 10> As shown in FIGS. 4B and 6A, a camera channel 13, water supply channels 141 and 142, and a forceps channel 17 are formed in the shaft 10 constituting the endoscope 100. Further, in the shaft 10, wire lumens 151, 152, 153, and 154 through which the operation wires 51, 52, 53, and 54 are inserted are formed.

[0034] The length (effective length) of the shaft 10 is preferably 200 to 4800 mm, and a suitable example is 1900 mm.

[0035] The shaft 10 has a flexible tip portion 10A. Here, the "flexible tip portion" refers to the tip portion of the shaft that can be bent (flexed) by pulling the rear end of the operating wire. The length of the tip flexible portion 10A is preferably 5 to 200 mm, and a suitable example is 20 mm.

[0036] The outer diameter of the shaft 10 is usually 2.8 to 4.1 mm, preferably 3.2 to 3.7 mm, and a suitable example is 3.6 mm. Such a small diameter shaft 10 can be inserted into the bile duct or pancreatic duct to perform diagnosis and treatment within the duct.

[0037] The diameter of the camera channel 13 is normally 0.75 to 1.2 mm, preferably 0.95 to 1.1 mm, and a suitable example is 1.05 mm.

[0038] A biological forceps is inserted through the forceps channel 17, and a medicinal liquid can be passed through the forceps channel 17. Furthermore, the forceps channel 17 also functions as a suction channel, allowing bodily fluids around the tip of the shaft 10 to flow in through the forceps opening and circulate.

[0039] The diameter of the forceps channel 17 is preferably 1.8 to 3.1 mm, more preferably 1.9 to 2.1 mm, and a suitable example is 2.0 mm. Since the diameter of the forceps channel 17 is 1.8 mm or more, it becomes possible to insert a general-purpose biological forceps having an outer diameter of about 1.75 mm, which cannot be inserted by conventional endoscopes, and since the diameter of the forceps channel 17 is 1.9 mm or more, it becomes possible to insert a general-purpose biological forceps having an outer diameter of about 1.85 mm.

[0040] By using such general-purpose biopsy forceps, it is possible to obtain a sufficient amount of tissue during biopsy, and good clinical results can be obtained. In addition, general-purpose biopsies are significantly cheaper than forceps with an outer diameter of 4 Fr (1.33 mm) or less that can be passed through conventional endoscopes.

[0041] The diameter of the water supply channels 141, 142 is preferably 0.4 to 1.0 mm, and a suitable example is 0.75 mm. The diameter of the wire lumens 151, 152, 153, 154 is preferably 0.2 to 0.5 mm, and a suitable example is 0.33 mm.

[0042] The shaft 10 is made of resin. Examples of the resin material constituting the shaft 10 include nylon resin, polyether block amide (PEBAX) resin, polyurethane resin, and polyolefin resin, and among these, PEBAX resin and polyurethane resin are preferred.

[0043] It is preferable that the hardness (Shore D hardness) of the resin constituting the shaft 10 is 90D or less. As a suitable example, the hardness of the resin constituting the tip flexible portion 10A is 25D, and the hardness of the resin constituting the portion other than the tip flexible portion 10A is 30D.

[0044] <Handle 20> 1 and 2, a handle 20 is disposed on the base end side of the shaft 10. The handle 20 constituting the endoscope 100 includes a grip 21 and two operation knobs 251, 252 as a rotation operation section.

[0045] The handle 20 is provided with a camera port 23 communicating with the camera channel 13, a forceps port 27 communicating with the forceps channel 17, a water supply port 24 communicating with the water supply channels 141 and 142, and a suction port 26 communicating with the forceps channel 17.

[0046] A camera connector 70 is attached to the camera port 23 . A Y connector 90 having a forceps insertion port 91 and a liquid medicine injection port 93 is attached to the forceps port 27 .

[0047] As shown in FIG. 2, a first chamber 277 and a second chamber 247 are disposed within the handle 20. The first chamber 277 communicates with the forceps channel 17 of the shaft 10 . The second chamber 247 communicates with the water supply channels 141 , 142 of the shaft 10 .

[0048] In FIG. 2, reference numeral 275 denotes a forceps tube, and the forceps tube 275 communicates between the forceps port 27 and a first chamber 277 . As a result, the forceps port 27 of the handle 20 communicates with the forceps channel 17 of the shaft 10 via the forceps tube 275 and the first chamber 277 .

[0049] 2, 245 is a water supply tube, the base end of which is connected to a water supply tank (not shown). The water supply tube 245 is inserted into the handle 20 from the water supply port 24 and extends inside the handle 20, and the tip end of the water supply tube 245 is connected to the second chamber 247. As a result, the lumen of the water supply tube 245 communicates with the water supply channels 141 and 142.

[0050] 2, 265 is a suction tube, the base end of which is connected to a suction pump (not shown). The suction tube 265 is inserted into the handle 20 from the suction port 26 and extends inside the handle 20, and the tip end of the suction tube 265 is connected to the first chamber 277. As a result, the lumen of the suction tube 265 communicates with the forceps channel 17 and the forceps port 27.

[0051] In FIG. 2, 80 denotes a valve mechanism that opens and closes the suction flow path of the suction tube 265, the details of which will be described later.

[0052] <Tip 30> A distal tip 30 is disposed on the distal end side of the shaft 10 . As shown in FIGS. 4A, 4C, and 6B, the distal tip 30 constituting the endoscope 100 has a camera channel 33, water supply channels 341 and 342, and a forceps channel 37 formed therein.

[0053] The camera channel 33 communicates with the camera channel 13 of the shaft 10 via a communication passage 43. The diameter of the camera channel 33 is the same as the diameter of the camera channel 13 that communicates with it. The water supply channels 341, 342 communicate with the water supply channels 141, 142 of the shaft 10 via communication passages 441, 442, respectively. The diameters of the water supply channels 341, 342 are the same as the diameters of the water supply channels 141, 142 communicating therewith. The forceps channel 37 communicates with the forceps channel 17 of the shaft 10 via a communication passage 47. The diameter of the forceps channel 37 is the same as the diameter of the forceps channel 17 communicating therewith.

[0054] The length of the distal tip 30 is preferably 1 to 30 mm, and a suitable example is 3 mm. The outer diameter of the distal tip 30 is the same as the outer diameter of the shaft 10 .

[0055] The tip 30 is made of resin. Examples of the resin material constituting the distal tip 30 include the same resins as those exemplified as the resin constituting the shaft 10, and among these, PEBAX resin and polyurethane resin are preferred. In order not to damage internal body tissue, the distal tip 30 is made of a low-hardness resin material. The hardness (Shore D hardness) of the resin constituting the distal tip 30 is preferably 72D or less, and a suitable example is 25D.

[0056] <Intermediate member 40> A disk-shaped intermediate member 40 is disposed between the shaft 10 and the distal tip 30 . The intermediate member 40 constituting the endoscope 100 is a member for fixing the respective distal ends of the operation wires 51, 52, 53, 54 to the distal end of the shaft 10 (for preventing them from coming off when the rear end is pulled).

[0057] As shown in FIG. 4D and FIG. 6B, in the intermediate member 40, one main through hole 41 surrounding the communication passage 43, and all of the communication passages 441, 442 and the communication passage 47 is formed.

[0058] Here, the communicating passage 43 is a passage (camera channel) defined by the constituent resin 130 of the shaft 10 and / or the tip tip 30 to communicate between the camera channel 13 of the shaft 10 and the camera channel 33 of the tip tip 30, and the diameter of the communicating passage 43 is the same as the diameters of the camera channel 13 and the camera channel 33.

[0059] The communicating passages 441, 442 are passages (water supply channels) defined by the constituent resin 130 of the shaft 10 and / or the tip tip 30 to connect each of the water supply channels 141, 142 of the shaft 10 to each of the water supply channels 341, 342 of the tip tip 30, and the diameter of the communicating passages 441, 442 is the same as the diameter of the water supply channels 141, 142 and the water supply channels 341, 342.

[0060] The communicating passage 47 is a passage (forceps channel) defined by the constituent resin 130 of the shaft 10 and / or the distal tip 30 to communicate between the forceps channel 17 of the shaft 10 and the forceps channel 37 of the distal tip 30, and the diameter of the communicating passage 47 is the same as the diameters of the forceps channel 17 and the forceps channel 37.

[0061] 4D, the intermediate member 40 has four sub-through holes 421, 422, 423, and 424 formed in correspondence with the positions of the wire lumens 151, 152, 153, and 154 of the shaft 10. The sub-through holes 421, 422, 423, and 424 serve as passages for the operation wires 51, 52, 53, and . The auxiliary through holes 421, 422, 423, 424 are circular holes, and their diameters are adjusted to be larger than the diameter of the operation wires 51, 52, 53, 54 to be inserted and smaller than the diameter of the large diameter tip portions 511, 521, 531, 541 whose insertion should be restricted. The diameter of the sub-through hole is preferably 0.13 to 2.5 mm, and a suitable example is 0.35 mm.

[0062] The thickness of the intermediate member 40 is preferably 0.05 to 3 mm, and a suitable example is 0.15 mm. If the thickness of the intermediate member 40 is too small, the intermediate member 40 may be damaged by the mechanical shock caused by the pulling operation of the operation wires 51, 52, 53, and . On the other hand, if this thickness is too large, the intermediate member 40 itself is difficult to bend, which may make it difficult to bend the tip flexible portion 10A.

[0063] The outer diameter of the intermediate member 40 is the same as the outer diameter of the shaft 10 and the distal tip 30, so that the outer peripheral surfaces of the shaft 10, the intermediate member 40 and the distal tip 30 are all flush with each other, and the intermediate member 40 does not protrude between the shaft 10 and the distal tip 30, exposing its edges and preventing damage to internal body tissues by such edges.

[0064] The intermediate member 40 is made of metal or ceramics, and is preferably made of metal. Examples of the metal material constituting the intermediate member 40 include stainless copper, platinum, gold, copper, nickel, titanium, and tantalum, and among these, stainless copper is preferable.

[0065] In the endoscope 100 of this embodiment, the shaft 10 and the distal tip 30 are directly joined (their constituent resins are welded together) inside the main through hole 41 of the intermediate member 40 and in an area outside each of the communication paths 43, 441, 442, 47 (area surrounded by the main through hole 41 excluding the communication paths). As a result, the intermediate member 40 is also fixed by the resin inside the main through hole 41, and the intermediate member 40 is firmly fixed to the shaft 10 and the distal tip 30. Furthermore, since the shaft 10 and the distal tip 30 are directly joined, albeit partially, the fixing strength of the distal tip 30 to the shaft 10 is sufficiently high.

[0066] Here, the area of ​​the region where the constituent resin of the shaft 10 and the distal tip 30 are directly bonded is defined as (S), and the cross-sectional area of ​​the shaft 10 is defined as (S 0 ), then (S) / (S 0 ) is preferably 0.1 or more, and more preferably 0.3 to 0.6.

[0067] <Operation wires 51, 52, 53, 54> As shown in FIGS. 4B and 6A, operation wires 51, 52, 53, and 54 extend through wire lumens 151, 152, 153, and 154 of shaft 10, respectively.

[0068] As shown in FIGS. 6A and 6B, the distal ends of the operation wires 51, 52, 53, and 54 are large-diameter distal end portions 511, 521, 531, and 541, respectively. The large diameter tip portions 511, 521, 531, and 541 are spherical or partially spherical and have a diameter larger than the diameter of the sub-through holes 421, 422, 423, and 424 of the intermediate member 40, and cannot pass through the sub-through holes 421, 422, 423, and 424. The diameter of the large diameter tip portions 511, 521, 531, and 541 is preferably 0.2 to 3.5 mm, and a suitable example is 0.4 mm. The diameter of the operation wires 51, 52, 53, 54 (portions other than the large-diameter tip portions) is preferably 0.1 to 2.0 mm, and a suitable example is 0.25 mm.

[0069] The operation wires 51, 52 are held with their respective large-diameter tip portions 511, 521 embedded in the distal tip 30, and the wire portions on the proximal side of the large-diameter tip portions 511, 521 extend through the auxiliary through-holes 421, 422 of the intermediate member 40 to the wire lumens 151, 152 of the shaft 10. The proximal ends of the operation wires 51, 52 are fixed to the operation knob 25 of the handle 20.

[0070] By rotating the operation knob 25 in one direction to pull the proximal end of the operation wire 51, the operation wire 51 moves in the proximal direction through the wire lumen 151. At this time, the large-diameter tip portion 511 is caught in the secondary through-hole 421 of the intermediate member 40 and its movement in the proximal direction is restricted, so that the distal flexible portion 10A of the shaft 10 bends in the direction indicated by the arrow A1 in Fig. 4A, and the distal end of the endoscope 100 (distal tip 30) is deflected in the same direction. By rotating the operation knob 25 in the other direction to pull the base end of the operation wire 52, the operation wire 52 moves in the base end direction through the wire lumen 152. At this time, the large diameter tip portion 521 is caught in the secondary through hole 422 of the intermediate member 40 and its movement in the base end direction is restricted, so that the flexible tip portion 10A of the shaft 10 bends in the direction indicated by the arrow A2 in Fig. 4A, and the tip of the endoscope 100 (distal tip 30) is deflected in the same direction.

[0071] The operation wires 53, 54 are held with their respective large-diameter tip portions 531, 541 embedded in the distal tip 30, and the wire portions on the proximal side of the large-diameter tip portions 531, 541 extend through the auxiliary through-holes 423, 424 of the intermediate member 40 to the wire lumens 153, 154 of the shaft 10. The proximal ends of the operation wires 53, 54 are fixed to the operation knob 26 of the handle 20, respectively.

[0072] By rotating the operation knob 26 in one direction to pull the proximal end of the operation wire 53, the operation wire 53 moves in the proximal direction through the wire lumen 153. At this time, the large-diameter tip portion 531 is caught in the secondary through-hole 423 of the intermediate member 40 and its movement in the proximal direction is restricted, so that the distal flexible portion 10A of the shaft 10 bends in the direction indicated by the arrow A3 in Fig. 4A, and the distal end of the endoscope 100 (distal tip 30) is deflected in the same direction. By rotating the operation knob 26 in the other direction to pull the base end of the operation wire 54, the operation wire 54 moves in the base end direction through the wire lumen 154. At this time, the large diameter tip portion 541 is caught in the secondary through hole 424 of the intermediate member 40 and its movement in the base end direction is restricted, so that the flexible tip portion 10A of the shaft 10 bends in the direction indicated by the arrow A4 in Fig. 4A, and the tip of the endoscope 100 (distal tip 30) is deflected in the same direction.

[0073] As described above, when the rear ends of the operating wires 51, 52, 53, 54 are pulled, the large diameter tip portions 511, 521, 531, 541 get caught in the secondary through holes 421, 422, 423, 424 formed in the intermediate member 40, and the tips of the operating wires 51, 52, 53, 54 are fixed (retained) to the tip of the shaft 10, thereby bending the tip flexible portion 10A of the shaft 10 in the desired direction (the direction indicated by arrows A1 to A4). If an intermediate member is not placed between the shaft and the distal tip, when the proximal end of the operating wire is pulled, the tip of the operating wire (large diameter tip portion) cannot be adequately fixed (prevented from coming loose) to the tip of the shaft, and the large diameter tip portion may move toward the proximal end while pushing open the wire lumen, making it impossible to bend the flexible distal portion.

[0074] The material of the operation wires 51, 52, 53, 54 is not particularly limited, and the same material as that used for operation wires in conventionally known medical devices such as tip deflection operation can be used.

[0075] <Camera 60> The camera 60 constituting the endoscope 100 is composed of a camera head 61 equipped with a CMOS image sensor 611 and a cable tube 62 housing a transmission cable for the CMOS image sensor 611 .

[0076] As shown in FIG. 5, the camera 60 has a plurality of optical fibers 65 (24 in the illustrated example) built therein so as to surround the CMOS image sensor 611. This eliminates the need to form a separate channel for arranging the optical fiber, and allows the diameter of the shaft 10 to be reduced, making the device sufficiently compact. Furthermore, the camera 60 constituting the endoscope 100 is arranged so as to be detachable from the shaft 10 (it is not fixed to the shaft 10). Therefore, when the tip flexible portion 10A of the shaft 10 is bent, the camera 60 moves axially within the camera channel 13, thereby reducing the load on the optical fiber 65 located inside the camera 60.

[0077] The outer diameter of the camera head 61 is preferably 0.7 to 1.0 mm, and a suitable example is 1.0 mm. The outer diameter of the cable tube 62 is substantially the same as the outer diameter of the camera head 61.

[0078] The camera 60 is disposed in the camera channels (camera channel 13 and camera channel 33) of the shaft 10 and the distal tip 30, and the proximal end portion of the cable tube 62 extends externally from the camera port 23 of the handle 20, and the proximal end of the cable tube is connected to the control device.

[0079] A camera connector 70 is attached to the cable tube 62 of the camera 60 . The camera connector 70 is attached to the camera port 23 of the handle 20 when the camera 60 is properly positioned in the camera channel 13 and the camera channel 33 . That is, by attaching the camera connector 70 to the camera port 23 , the camera 60 is properly positioned in the camera channel 13 and the camera channel 33 . The mounting position of the camera connector 70 is set to 300 to 5000 mm from the tip of the camera 60, and a suitable example is set to 2100 mm from the tip of the camera 60.

[0080] In the endoscope 100 of this embodiment, the camera 60 is separable from the handle 20 and the shaft 10 . That is, the camera connector 70 can be removed from the camera port 23 , and the cameras 60 arranged in the camera channels 13 and 33 can be removed from the camera port 23 of the handle 20 together with the camera connector 70 .

[0081] In addition, the camera 60 that has been separated can be inserted, with the camera head 61 at the front, from the camera port 23 of the handle 20 into the interior of the handle 20 and the camera channel 13 of the shaft 10, and the camera connector 70 can be attached to the camera port 23, thereby re-assembling the camera 60 as a component of the endoscope 100.

[0082] The camera connector 70 has a camera position adjustment mechanism that moves the camera 60 back and forth relative to the camera channel 13 and the camera channel 33 so that, when attached to the camera port 23, the tip of the camera 60 disposed in the camera channel 13 and the camera channel 33 is displaced between a first position (the tip position of the camera 60 as shown in FIG. 8A) which is located on the base end side of the tip surface 35 of the tip chip 30 where the camera channel 33 opens, and a second position (the tip position of the camera 60 as shown in FIG. 8B) which is located on the tip end side of the tip surface 35.

[0083] Here, the distance from the first position to the second position (the distance the tip of the camera 60 is moved by the position adjustment mechanism) is preferably 2 to 100 mm, and a suitable example is 30 mm. Moreover, the distance from the distal end surface 35 of the distal tip 30 to the first position is preferably 1.5 to 20 mm, and the distance from the distal end surface 35 to the second position is preferably 0.5 to 80 mm.

[0084] In the endoscope 100 of this embodiment, the camera position adjustment mechanism of the camera connector 70 is a mechanism that uses a feed screw to reciprocate the camera 60. Specifically, a connector case 71 which is attached to the camera port 23, has a guide groove (not shown) formed on its inner peripheral surface and has a guide hole 713 formed on its peripheral wall, the guide groove extending along the axial direction; a shaft portion 721 extending into the inside of the connector case 71, a part of which extends towards the base end side of the connector case 71, with a male thread portion 722 formed at the base end portion, and a cable tube 62 of the camera 60 being adhesively fixed in a state of being inserted inside the shaft portion 721; and a guide portion 723 which is integrally formed with the shaft portion 721 so as to surround the tip portion of the shaft portion 721, has a convex ridge portion (not shown) formed on the outer circumferential surface thereof which is guided by a guide groove of the connector case 71, and has a protrusion 725 formed on the outer circumferential surface thereof which is guided by a guide hole 713; and a rotary knob 73 located at the base end side of the connector case 71, the axial movement of which is restricted, the rotary knob 73 having a female threaded portion 731 which screws into the male threaded portion 722 of the shaft portion 721 of the slide member 72, This mechanism moves the tip of camera 60 from a first position (the tip position of camera 60 as shown in FIG. 8A) to a second position (the tip position of camera 60 as shown in FIG. 8B) by rotating rotary knob 73 in one direction and sliding slide member 72 from the base end position to the tip position, and moves the tip of camera 60 from the second position to the first position by rotating rotary knob 73 in the other direction and sliding slide member 72 from the tip position to the base end position.

[0085] Here, the "base end position" is a position beyond which the slide member 72 cannot move toward the base end, as shown in FIG. 7A, and the "tip end position" is a position beyond which the slide member 72 cannot move toward the tip end, as shown in FIG. 7B.

[0086] The camera position adjustment mechanism is composed of a connector case 71, a slide member 72, and a rotating knob 73.

[0087] The connector case 71 is a component of the camera connector 70 that is attached to the camera port 23 via a port-side connector, which will be described later, and is made of a cylindrical body having an arch-shaped portion. A guide groove extending along the axial direction is formed on the inner peripheral surface of connector case 71, and a guide hole 713 extending along the axial direction is formed in the peripheral wall of the arch-shaped portion.

[0088] The slide member 72 is made up of a shaft portion 721 and a guide portion 723 that is formed integrally with the shaft portion 721 so as to surround the tip portion of the shaft portion 721 .

[0089] A shaft portion 721 of the slide member 72 extends inside the connector case 71, and a portion of the shaft portion 721 extends toward the base end from an opening formed in a base end surface 711 of the connector case 71. A male thread portion 722 is formed at the base end portion of the shaft portion 721 . As shown in FIGS. 7A and 7B, cable tube 62 of camera 60 is inserted into shaft portion 721 and fixed thereto with adhesive.

[0090] The guide portion 723 of the slide member 72 has an arch-shaped portion that matches the shape of the connector case 71 , and is formed integrally with the shaft portion 721 so as to surround the tip portion of the shaft portion 721 . The guide portion 723 has an outer peripheral surface formed with a protruding ridge portion that is guided by a guide groove of the connector case 71 . Furthermore, a protrusion 725 that is guided into a guide hole 713 of the connector case 71 is formed on the outer periphery of the arch-shaped portion of the guide portion 723 .

[0091] The rotary knob 73 is disposed on the base end side of the connector case 71 . The rotating knob 73 has an internal thread 731 formed on its inner periphery that screws into the external thread 722 of the shaft portion 721 of the sliding member 72 . Axial movement of the rotary knob 73 relative to the connector case 71 is restricted, and by rotating the rotary knob 73, the sliding member 72 slides relative to the connector case 71. Furthermore, by rotating the rotary knob 73 and sliding the slide member 72 , the cable tube 62 adhesively fixed to the inside of the shaft portion 721 also moves in the axial direction relative to the connector case 71 .

[0092] According to the camera position adjustment mechanism configured as described above, by rotating the rotating knob 73 in one direction and sliding the sliding member 72 from the base end position (the position shown in FIG. 7A) to the tip position (the position shown in FIG. 7B), the tip of the camera 60 can be moved from the first position (the tip position of the camera 60 as shown in FIG. 8A) to the second position (the tip position of the camera 60 as shown in FIG. 8B), and by rotating the rotating knob 73 in the other direction and sliding the sliding member 72 from the tip position to the base end position, the tip of the camera 60 can be moved from the second position to the first position.

[0093] <Valve mechanism 80> FIG. 9 is a flow diagram that illustrates a flow path for a medicinal liquid (passage for forceps), a flow path for water supply, and a suction flow path for suction in the endoscope 100 of the present embodiment. The handle 20 is provided with a forceps port 27, a water supply port 24, and a suction port 26.

[0094] A Y connector 90 having a forceps insertion port 91 and a liquid medicine injection port 93 is connected to the forceps port 27 of the handle 20. Reference numeral 95 denotes an opening / closing valve for the forceps insertion port 91.

[0095] With the opening / closing valve 95 of the Y connector 90 open, forceps can be inserted through the forceps insertion port 91, thereby passing the forceps through the inside of the handle 20 (forceps tube 275, first chamber 277) and the forceps channel 17 of the shaft 10, and the tip of the forceps can be extended from the forceps opening (the tip opening of the forceps channel).

[0096] In addition, by injecting a medicinal liquid through the medicinal liquid injection port 93 with the opening / closing valve 95 of the Y connector 90 closed, the medicinal liquid can be circulated through the inside of the handle 20 (forceps tube 275, first chamber 277) and the forceps channel 17 of the shaft 10, and can be caused to flow out (administered) from the forceps port.

[0097] The water supply tube 245, the base end of which is connected to the water supply tank 94, is inserted from the water supply port 24 into the handle 20 and extends through the handle 20, and the lumen of the water supply tube 245 communicates with the water supply channels 141, 142 of the shaft 10 via the second chamber 247. This allows the water in the water supply tank 94 to flow out from the water supply port.

[0098] The suction tube 265, the base end of which is connected to the suction pump 96, is inserted from the suction port 26 into the handle 20 and extends through the handle 20, and the tip of the suction tube 265 is connected to the first chamber 277, thereby merging with the communication passage between the forceps channel 17 and the forceps port 27. Thus, by operating the suction pump 96, the patient's bodily fluids and the like can be sucked from the forceps port (suction port) and discharged outside the body through the forceps channel 17 and the suction tube 265.

[0099] The endoscope 100 of this embodiment is characterized in that a valve mechanism 80 for opening and closing the suction flow passage formed by the lumen of the suction tube 265 is provided in the handle 20.

[0100] By providing the valve mechanism 80, when administering a medicinal liquid while the suction pump 96 is operating (injecting the medicinal liquid from the medicinal liquid injection port 93 of the Y connector 90), the suction flow path of the suction tube 265 is closed by the valve mechanism 80, thereby preventing the medicinal liquid flowing through the forceps tube 275 from being sucked into the suction tube 265, and allowing the medicinal liquid to flow through the forceps channel 17 and flow out (administer) from the forceps port. Then, by opening the suction flow path of the suction tube 265 after administration of the medicinal liquid, the operation of suctioning the patient's bodily fluids and discharging them from the body can be immediately resumed.

[0101] Furthermore, since the valve mechanism 80 is provided on the handle 20, the opening and closing operation of the suction flow path of the suction tube 265 can be easily performed while the handle 20 is being gripped. If such a valve mechanism were provided outside the handle (in the suction tube between the suction port and the suction pump), the opening and closing operations would have to be performed with one hand while holding (operating) the handle with the other, making the opening and closing operations extremely difficult.

[0102] 10A, 10B, and 11A to 11C show a valve mechanism 80 in an endoscope 100 of the present embodiment. Figures 10A and 11A show the "open" state in which the suction flow path of the suction tube 265 is open, Figures 10B and 11C show the "closed" state in which the suction flow path of the suction tube 265 is closed, and Figure 11B shows a state intermediate between "open" and "closed."

[0103] The valve mechanism 80 is composed of a tube holding portion 81 , a cylinder portion 83 , and a pressing member 85 .

[0104] The tube holding portion 81 constituting the valve mechanism 80 is disposed inside the handle 20 in order to hold the suction tube 265 (the portion whose outer circumferential surface should be pressed) extending inside the handle 20 in a predetermined position. The tube holding portion 81 has a flat plate portion 811, a tube gripping portion 813, and partition portions (8132, 8134). The flat plate portion 811 has a flat surface that faces a tip end surface of a pressing member 85, which will be described later. The tube gripping portion 813 is composed of convex plates 8131 to 8134 extending perpendicularly to the flat plate portion 811 on both sides of the flat plate portion 811. The suction tube 265 is inserted between the convex plates 8131 and 8132, and between the convex plates 8133 and 8134, thereby holding (clamping) the suction tube 265. A partition is formed by convex plates 8132 and 8134 which constitute tube gripping portion 813. This partition (8132, 8134) can separate suction tube 265 from water supply tube 245 which extends in parallel therewith, and can prevent the outer circumferential surface of water supply tube 245 from being pressed (the water flow path from being blocked).

[0105] A cylinder portion 83 constituting the valve mechanism 80 is formed in the handle 20 so as to communicate between the inside and outside of the handle 20 . The cylinder portion 83 is formed with a base end opening 831 through which a shaft portion 851 of a pressing member 85, which will be described later, is inserted.

[0106] The pressing member 85 constituting the valve mechanism 80 moves inside the cylinder portion 83 along the axial direction while rotating around the axis of the cylinder portion 83. As shown in FIG. 12, the pressing member 85 is formed by integrally molding a shaft portion 851, an operating lever 853, a partial outer periphery portion 855, and a tip portion 857.

[0107] The base end of the shaft portion 851 extends from the base end opening 831 of the cylinder portion 83 to the outside of the handle 20, and an operating lever 853 for rotating the pressing member 85 is attached to the base end of the shaft portion 851.

[0108] The partial outer peripheral portion 855 of the pressing member 85 is formed so as to cover a portion (0° to 90° and 180° to 270°) of the circumferential direction of the outer peripheral surface of the shaft portion 851, and has an outer peripheral surface 8551 that can slide against the inner peripheral surface of the cylinder portion 83, and a helical base end surface 8553 that can slide against the inner end surface 833 of the cylinder portion 83.

[0109] 12, the tip 857 of the pressing member 85 is annular. Such an annular tip 857 reduces the pressing area on the outer circumferential surface of the suction tube 265, allowing the pressing force to be concentrated, so that the suction flow path of the suction tube 265 can be blocked more reliably.

[0110] By rotating the shaft portion 851 using the operating lever 853 from the "open" state as shown in FIG. 10A (FIG. 11A), the base end surface 8553 of the partial outer periphery portion 855 slides against the inner end surface 833 of the cylinder portion 83, and accordingly, as shown in FIG. 11B, the pressing member 85 moves along the axial direction while rotating around the axis of the cylinder portion 83, and the tip portion 857 of the pressing member 85 located (waiting) inside the cylinder portion 83 extends from the tip opening 835 of the cylinder portion 83 into the inside of the handle 20, and the tip surface of the pressing member 85 presses the outer periphery of the suction tube held by the tube gripping portion 813. Then, when the operating lever 853 is rotated to the position shown in FIG. 10B, the outer peripheral surface of the suction tube 265 is sufficiently pressed by being sandwiched between the tip surface of the pressing member 85 and the flat plate portion 811, as shown in FIG. 11C, so that the suction flow path is completely blocked to the “closed” state.

[0111] According to the endoscope 100 of this embodiment, the handle 20 is provided with a valve mechanism 80 for opening and closing the suction flow path of the suction tube 265, so that the opening and closing of the suction flow path by the suction tube 265 can be easily performed by rotating the operating lever 853 while holding the handle 20. As a result, when injecting medicinal liquid from the forceps port 27 of the handle 20 while the suction pump is operating, the valve mechanism 80 can be set to the "closed" state, ensuring that the injected medicinal liquid flows out of the forceps port at the tip of the shaft 10.

[0112] Furthermore, the suction tube 265 (the portion whose outer circumferential surface should be pressed) can be held in a predetermined position by the tube gripping portion 813 composed of the protruding plates 8131 to 8134. In addition, the partition portion formed by convex plates 8132 and 8134 can reliably prevent the outer peripheral surface of water supply tube 245, which extends parallel to suction tube 265, from being pressed (the flow path for water supply being blocked). [Explanation of symbols]

[0113] 100 Endoscope 10 Shaft 10A flexible tip 13 Camera Channels 130 Constituent resin of shaft and / or tip 151,152,153,154 Wire Lumen 141,142 Water supply channel 17 Forceps channel (suction channel) 20 Handle 21 Grip 23 Camera port 24 Water supply port 245 Water Supply Tube 247 Second Chamber 251,252 Control knob 26 Suction port 265 Suction Tube 27 Forceps port 275 Forceps Tube 277 First Chamber 30 Tip 35 Tip surface 33 Camera Channels 341,342 Water Channel 37 Forceps channel (suction channel) 40 Intermediate parts 41 Main through hole 421,422,423,424 Sub through holes 43,441,442,47 Communication path 51, 52, 53, 54 Control wire 511,521,531,541 Large diameter tip of operating wire 60 Cameras 61 Camera Head 611 CMOS Image Sensor 62 Cable Tube 65 Optical Fiber 70 Camera connector 71 Connector case 711 Proximal surface 713 Guide hole 72 Slide member 721 Shaft section 722 Male thread 723 Guide part 725 Protrusion 73 Rotating knob 731 Female thread 80 Valve mechanism 81 Tube holder 811 Flat plate part 813 Tube gripping part 8131~8134 Convex plate 83 Cylinder section 831 Proximal opening 833 Inner end surface 835 Tip opening 85 Pressing member 851 Shaft 853 Operating lever 855 Partial outer circumference 8551 Partial outer peripheral surface 8553 Base end face of partial outer periphery 857 Tip 90 Y Connector 91 Forceps insertion port 93 Chemical injection port 94 Water tank 95 Opening and closing valve for forceps insertion port 96 Suction Pump

Claims

1. a shaft in which a forceps channel, which also serves as a suction channel, and a water supply channel are formed; a handle disposed on a proximal end side of the shaft and having a forceps port, a water supply port, and a suction port communicating with the forceps channel; a camera disposed within the shaft and the handle; a suction tube, the base end of which is connected to a suction means, which is inserted into the handle from the suction port and extends through the handle, and the tip of which joins a communication passage between the forceps channel and the forceps port; a water supply tube having a proximal end connected to a water supply means, the water supply tube being inserted from the water supply port into the handle and extending through the handle, the lumen of the water supply tube being in communication with the water supply channel; The endoscope according to claim 1, wherein the handle is provided with a valve mechanism for opening and closing a suction flow path through the suction tube.

2. 2. The endoscope according to claim 1, wherein the valve mechanism is brought into a "closed" state by pressing an outer circumferential surface of the suction tube to close the suction flow path.

3. the valve mechanism comprises: a tube holding portion disposed inside the handle and holding the suction tube extending inside the handle at a predetermined position; a cylinder portion attached or formed on the handle so as to communicate between the inside and outside of the handle; and a pressing member that moves along the axial direction while rotating around the axis of the cylinder portion; 3. The endoscope according to claim 2, wherein when the valve mechanism is in an "open" state, a tip of the pressing member is located inside the cylinder portion, and when the valve mechanism is in a "closed" state, the tip of the pressing member extends from a tip opening of the cylinder portion into the interior of the handle, and a tip surface of the pressing member presses an outer peripheral surface of the suction tube held by the tube holding portion.

4. The pressing member includes a shaft portion having a base end extending from a base end opening of the cylinder portion to the outside of the handle; an operating lever attached to the base end of the shaft portion for rotating the pressing member; a partial outer circumferential portion formed so as to cover a part of an outer circumferential surface of the shaft portion and having an outer circumferential surface slidable against an inner circumferential surface of the cylinder portion and a spiral base end surface slidable against an inner end surface of the cylinder portion; The tip portion is integrally molded, 4. The endoscope according to claim 3, characterized in that, by rotating the shaft portion with the operating lever, the base end surface of the partial outer circumferential portion slides against the inner end surface of the cylinder portion, whereby the pressing member moves along the axial direction while rotating around the axis of the cylinder portion.

5. 5. The endoscope according to claim 4, wherein the pressing member rotates substantially 90 degrees about the axis of the cylinder portion while the valve mechanism is changing from the "open" state to the "closed" state.

6. 6. The endoscope according to claim 3, wherein the tip of the pressing member is annular.

7. The endoscope according to any one of claims 3 to 6, characterized in that the tube holding portion comprises a flat plate portion having a flat surface facing the tip surface of the pressing member across the suction tube, and tube gripping portions formed on both sides of the flat plate portion.

8. the suction tube extends inside the handle in parallel with the water supply tube at least in a portion held by the tube holding portion; the tube holding portion has a partition portion formed of a protruding plate extending perpendicularly to the flat plate portion, 8. The endoscope according to claim 7, wherein the suction tube and the water supply tube are separated by the partition.

Images