CN111629648B

CN111629648B - Endoscope with a lens

Info

Publication number: CN111629648B
Application number: CN201980009015.5A
Authority: CN
Inventors: 森本康彦; 福泽常夫
Original assignee: Fujifilm Corp
Current assignee: Fujifilm Corp
Priority date: 2018-02-16
Filing date: 2019-01-17
Publication date: 2023-06-23
Anticipated expiration: 2039-01-17
Also published as: DE112019000825T5; JP6859483B2; CN111629648A; JPWO2019159591A1; WO2019159591A1

Abstract

The invention provides an endoscope capable of realizing position limitation of a stand upright rod and a rotating shaft, improvement of stand performance of the stand upright rod and reduction of diameter of a front end part. The endoscope is provided with: an insertion section; an operation unit; a stand assembly; a rotation shaft; a stand connected to one end of the rotation shaft and guiding the treatment tool; a standing stand upright having a main body, a base end and a front end; a pole accommodating chamber provided in the standing platform assembly and having an exposure window exposing a 1 st pole side surface of the standing platform upright pole; a partition wall provided between the rod accommodation chamber and the stand and having a holding hole for supporting the rotation shaft; an annular seal member through which the rotary shaft is inserted; a cover detachably covering the exposure window; and a 1 st restriction portion provided on at least one of a body portion side surface, which is a side surface of the lever body portion, of the 1 st lever side surface and a cover inner surface of the cover on the stand upright side, and restricting displacement of the stand upright in the 1 st direction.

Description

Endoscope with a lens

Technical Field

The present invention relates to an endoscope including a stand for guiding a treatment tool guided from a distal end portion of an insertion portion.

Background

As an ultrasonic endoscope, an ultrasonic endoscope including an electronic scanning type ultrasonic transducer at a distal end portion of an insertion portion of the endoscope and a treatment tool outlet disposed on a proximal end side of the ultrasonic transducer at the distal end portion is known. In endoscopy using this ultrasonic endoscope, for example, while an ultrasonic image of a lesion is acquired by an ultrasonic transducer, a puncture treatment tool introduced into the body is punctured into the lesion through a treatment tool channel and a treatment tool outlet to collect cells. In order to perform treatment at a desired position in the body cavity, it is necessary to change the direction of the guide-out from the distal end portion, and therefore, a treatment tool raising mechanism is provided at the distal end portion.

As such a treatment tool raising mechanism, a treatment tool raising mechanism including a raising table disposed in a raising table accommodating chamber, a rotation shaft, and a raising table upright is known (see patent documents 1 to 6). The standing platform accommodating chamber is formed on one side surface side of the partition wall provided in the front end portion. The rotation shaft is rotatably supported by a holding hole (through hole) of the partition wall.

One end of the rotating shaft is connected with a stand, and the other end is connected with a stand upright. Therefore, the partition wall is disposed between the standing platform and the standing platform upright. Further, a pole accommodating chamber accommodating the standing pole is formed on the other side surface side of the partition wall. According to this treatment tool raising mechanism, the operation of the operation lever of the operation unit of the ultrasonic endoscope is transmitted to the raising stage rod via the operation wire, and the raising stage rod is rotated, whereby the rotation shaft is rotated, and the raising stage can be displaced (rotated) about the rotation shaft.

In the treatment instrument raising mechanism using the raising stand, for example, a sealing member such as an O-ring (O ring) is disposed between the outer peripheral surface of the rotation shaft and the inner wall surface of the holding hole, so that blood, water, and the like are prevented from entering the rod storage chamber from the above-described raising stand storage chamber.

However, in the ultrasonic endoscope, as described above, the ultrasonic transducer is disposed on the distal end side of the distal end portion, and therefore, it is impossible to provide the distal end portion with a detachable cover structure as in the side-view type endoscope (for example, a duodenoscope) disclosed in the above-mentioned patent documents 3 to 6. Therefore, when replacing the stand upright and the seal member, etc., the distal end portion needs to be disassembled.

For this reason, for example, in the ultrasonic endoscope described in patent document 1, an opening for replacement (for removal) such as a stand bar and a sealing member is provided in a part of the wall surface of the rod accommodation chamber, the opening is watertight covered with a metal cover, and the metal cover is covered with a resin outer surface cover constituting a part of the outer peripheral surface of the distal end portion. The metal cover is provided with a movement limiting surface which is in contact with the rotating shaft to limit the movement of the rotating shaft and the upright post of the upright post to the metal cover side.

In the ultrasonic endoscope described in patent document 2, as in patent document 1, an opening for replacement such as a stand upright and a sealing member is provided in a part of the wall surface of the rod accommodation chamber, and the opening is covered with a cover constituting a part of the outer peripheral surface of the distal end portion.

Technical literature of the prior art

Patent literature

Patent document 1: japanese patent laid-open publication 2016-131578

Patent document 2: japanese patent No. 6138404

Patent document 3: japanese patent application laid-open No. 2004-141315

Patent document 4: japanese patent application laid-open No. 2010-201020

Patent document 5: japanese patent laid-open publication 2016-174817

Patent document 6: japanese patent laid-open publication 2016-174818

Disclosure of Invention

Technical problem to be solved by the invention

Each time an ultrasonic endoscope is used for various examinations, treatments, and the like, a cleaning treatment using a cleaning liquid and a disinfectant is required. In this case, since the distal end portion including the treatment tool raising mechanism is miniaturized and its shape is complicated, it is required to improve the cleaning performance such as the inflow of the cleaning liquid, the insertion performance and the dewatering performance of the cleaning brush, and the ease of the cleaning work. For example, if the side surface of the stand on the partition wall side is in close contact with the partition wall, there is a possibility that the cleaning liquid or the like cannot flow into the side surface or that the cleaning brush cannot be brought into contact with the side surface. Therefore, a gap is preferably formed between the side surface of the standing board on the partition wall side and the partition wall.

However, when a gap is formed between the side surface of the stand on the partition wall side and the partition wall, the rotation shaft is displaced in the axial direction thereof in accordance with the rotation operation of the stand or the like. Therefore, as described in patent document 2, only by covering the opening of the rod accommodation chamber with a cover, the position of the sealing member (airtight surface) may be displaced in the axial direction described above or the sealing member may slip against the inner wall surface of the holding hole and be broken.

Fig. 29 is an explanatory view for explaining a problem of the ultrasonic endoscope described in patent document 1. In the figure, reference numeral 502 denotes a distal end portion of an ultrasonic endoscope, reference numeral 504 denotes a partition wall, reference numeral 506 denotes a rotation shaft, reference numeral 508 denotes a stand, reference numeral 510 denotes a stand upright, reference numeral 514 denotes a rod accommodating chamber, reference numeral 516 denotes a metal cover, reference numeral 518 denotes a resin cover, and reference numeral 520 denotes a sealing member.

As shown by reference numeral 500A in fig. 29, in the ultrasonic endoscope described in patent document 1, the opening of the rod accommodating chamber 514 is covered with a metal cover 516 and a resin cover 518. In this ultrasonic endoscope, the metal cap 516 is brought into contact with the connecting portion of the rotation shaft 506 of the stand upright 510 with respect to the shaft center 506A of the rotation shaft 506. This can improve the replaceability of the stand bar 510, the seal member 520, and the like, and limit the positions of the stand bar 510 and the rotation shaft 506.

However, as shown by reference numeral 500B in fig. 29, in order to improve the raising performance of the raising table pole 510 corresponding to the raising operation of the operation lever, which is not shown, it is necessary to lengthen the length LQ of the raising table pole 510 [ the length from the connection portion with the operation line, which is not shown, to the connection portion with the rotation shaft 506 (shaft center 506A) ] according to the principle of leverage. In this case, if the increase in the length IQ of the upright 510 and the reduction in diameter of the distal end portion 502 are both achieved, the position of the axial center 506A of the rotation shaft 506 is shifted downward in the drawing in the cross section of the distal end portion 502. Therefore, the metal cover 516 cannot be brought into contact with the rotary shaft 506 or the like.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an endoscope capable of realizing positional restriction of a stand bar and a rotation shaft, improvement of the stand performance of the stand bar, and reduction of the diameter of a distal end portion.

Means for solving the technical problems

An endoscope for achieving the object of the present invention is provided with: an insertion portion having a front end and a base end; an operation section provided on the base end side of the insertion section and having an operation member; a stand assembly provided at the front end side of the insertion portion; a rotation shaft rotatably supported by the stand assembly; a stand coupled to one end of the rotation shaft and guiding a treatment tool guided from the stand assembly; a standing stand upright having a rod main body portion, a rod base end portion provided on one end side of the rod main body portion and connected to the other end of the rotary shaft, and a rod front end portion provided on the other end side of the rod main body portion; a rod accommodating chamber which is provided in the stand assembly, accommodates the stand upright rod rotatably about the rotation axis, and has an exposure window for exposing a 1 st rod side surface of the stand upright rod on a side opposite to the rotation axis side; an operation wire having a base end side connection portion connected to the operation member and a tip end side connection portion connected to a tip end portion of the lever of the stand upright, and rotating the rotation shaft via the stand upright by an operation of the operation member to raise the stand; a partition wall which is a part of the stand assembly, is provided between the rod accommodating chamber and the stand, and has a holding hole for supporting the rotation shaft; an annular sealing member through which the rotary shaft is inserted and which maintains air tightness between the outer peripheral surface of the rotary shaft and the inner wall surface of the holding hole; a cover detachably covering the exposure window; and a 1 st restriction portion provided on at least one of a body portion side surface, which is a side surface of the lever body portion, of the 1 st lever side surface and a lid inner surface of the lid on the stand upright post side, and interposed between the body portion side surface and the lid inner surface to restrict displacement of the stand upright post in the 1 st direction of the lid side in a direction parallel to the axis of the rotary shaft.

According to this endoscope, even when the length of the stand bar is extended, the displacement in the 1 st direction of the stand bar and the rotation shaft can be restricted without making the distal end portion of the insertion portion thick.

In the endoscope according to another aspect of the present invention, the partition wall includes a 1 st housing chamber wall surface that forms a bottom surface of the rod housing chamber on the stand side and in which the holding hole is opened, and includes a 2 nd restricting portion that is provided on at least one of a 2 nd rod side surface on the rotation axis side of the stand rod and a 1 st housing chamber wall surface, and that restricts displacement of the stand rod in a 2 nd direction on the opposite side to the 1 st direction between the 2 nd rod side surface and the 1 st housing chamber wall surface. This prevents displacement of the stand upright and the rotary shaft in the axial direction of the rotary shaft.

In the endoscope according to another aspect of the present invention, the exposure window exposes a rotation range of the stand upright which rotates around the rotation axis in the rod accommodating chamber. Thereby, the restriction by the 1 st restriction portion can be performed at each rotation position of the stand upright.

In the endoscope according to the other aspect of the present invention, when the 1 st restriction portion is provided on the inner surface of the cover, the 1 st restriction portion has a shape of a rotating trajectory along at least a part of the main body side surface of the upright post rotating about the rotation axis, and is interposed between the main body side surface and the inner surface of the cover at each rotation position of the upright post. Thereby, the restriction by the 1 st restriction portion can be performed at each rotation position of the stand upright.

In the endoscope according to the other aspect of the present invention, the partition wall has a 2 nd housing chamber wall surface that forms a side surface of the rod housing chamber and is formed with a wire insertion hole through which the operation wire is inserted, and when the wire insertion hole is viewed from the distal end side of the stand unit, the center position of the wire insertion hole is displaced toward the stand side from the distal end portion of the rod. This can more reliably restrict the displacement of the upright post and the rotation shaft in the 1 st direction.

In the endoscope according to another aspect of the present invention, the seal member is disposed between the inner wall surface of the holding hole and the outer peripheral surface of the rotary shaft, and a part of the seal member is exposed from the holding hole opening on the stand side of the holding hole. This prevents blood, water, and the like from entering between the outer peripheral surface of the rotating shaft and the inner wall surface of the holding hole.

In an endoscope according to another aspect of the present invention, an annular seal member mounting groove is formed on an outer peripheral surface of a rotary shaft so as to extend from a position closer to a stand upright than a holding hole opening to a position closer to the stand than the holding hole opening, and a seal member is provided with: a 1 st wall portion in close contact with a groove bottom surface of the seal member mounting groove; a 2 nd wall portion closely contacting with the 1 st wall surface of the seal member mounting groove on the stand side; and a 3 rd wall portion having a region closely contacting the inner wall surface of the holding hole and an exposed region located closer to the stand side than the holding hole opening. This makes it possible to reliably maintain the airtight seal between the outer peripheral surface of the rotary shaft and the inner wall surface of the holding hole.

In the endoscope according to the other aspect of the present invention, the seal member has elasticity, and the 1 st wall portion is formed to have a width longer than the width of the seal member mounting groove in the axial direction of the rotary shaft, and the seal member is mounted in the seal member mounting groove in a state in which the 1 st wall portion is compressed in the axial direction of the rotary shaft. This can improve the sealing function of the sealing member.

In the endoscope according to another aspect of the present invention, a biasing member or an elastic member for biasing one of the 1 st wall portion and the 3 rd wall portion in a direction away from the other is provided between the 1 st wall portion and the 3 rd wall portion of the sealing member. This can improve the sealing function of the sealing member.

In the endoscope according to another aspect of the present invention, the rotary shaft is divided into a 1 st rotary shaft and a 2 nd rotary shaft in the axial direction of the rotary shaft with a 2 nd groove wall surface on the side of the stand upright of the seal member mounting groove as a boundary, the 1 st rotary shaft is connected to the stand upright at one end and has a 1 st connecting portion and a 2 nd groove wall surface at the other end, and the 2 nd rotary shaft is connected to the stand at one end and has a 2 nd connecting portion and a groove bottom surface and a 1 st groove wall surface connected to the 1 st connecting portion at the other end.

In the endoscope according to the other aspect of the present invention, when the direction on the opposite side to the 1 st direction is the 2 nd direction, one end of the rotation shaft is located at a position farther in the 2 nd direction than the holding hole opening on the standing table side of the holding hole, the partition wall has an opposing wall surface that is formed with the holding hole opening and that faces the standing table, and the seal member is disposed between the opposing wall surface and the standing table and has an insertion hole through which the rotation shaft is inserted, a 4 th wall portion that is in close contact with the opposing wall surface, and a 5 th wall portion that is in close contact with the side surface on the rotation shaft side of the standing table. This makes it possible to reliably maintain the airtight seal between the outer peripheral surface of the rotary shaft and the inner wall surface of the holding hole.

In the endoscope according to the other aspect of the present invention, an annular seal member mounting groove in which a seal member is externally fitted and an annular wall portion of a 1 st groove wall surface on a stand side constituting the seal member mounting groove are formed in an outer peripheral surface of the rotary shaft, the seal member mounting groove is formed in a position closer to the stand upright side than a holding hole opening on the stand side of the holding hole on the outer peripheral surface of the rotary shaft, and the annular wall portion covers a part of a seal side surface of the seal member facing the 1 st groove wall surface by the 1 st groove wall surface. This improves the cleaning performance of the seal side surface of the seal member, and facilitates the cleaning operation.

In an endoscope according to another aspect of the present invention, a notch is provided in a part of an outer peripheral surface of an annular wall portion. This improves the cleaning performance of the seal side surface of the seal member, and facilitates the cleaning operation.

In the endoscope according to another aspect of the present invention, the diameter of the outer peripheral surface of the annular wall portion is smaller than the diameter of the outer peripheral surface of the sealing member. This improves the cleaning performance of the seal side surface of the seal member, and can facilitate the cleaning operation.

In the endoscope according to another aspect of the present invention, a cover airtight holding member for holding airtightness between the exposure window and the cover is provided.

Effects of the invention

The endoscope of the present invention can realize the position limitation of the upright post and the rotating shaft of the upright post, the improvement of the upright performance of the upright post and the reduction of the diameter of the front end part.

Drawings

Fig. 1 is a schematic view of an ultrasonic inspection system to which the endoscope of the present invention is applied.

Fig. 2 is a schematic view showing a pipe structure of the ultrasonic endoscope.

Fig. 3 is an external perspective view of the distal end portion of the insertion portion.

Fig. 4 is a left side view of the distal end portion of the insertion portion as viewed from the distal end side thereof.

Fig. 5 is a right side view of the distal end portion of the insertion portion when viewed from the distal end side thereof.

Fig. 6 is an exploded perspective view of the distal end portion of the insertion portion.

Fig. 7 is an exploded perspective view of the riser assembly.

Fig. 8 is a right side view of the stand assembly when the front end portion is viewed from the front end side.

Fig. 9 is a front view of the stand assembly when the front end portion is viewed from the front end side.

Fig. 10 is a schematic diagram showing an example of the stand operation mechanism.

Fig. 11 is an explanatory view for explaining the rotation of the stand corresponding to the operation of the operation lever.

Fig. 12 is an external perspective view of the stand.

Fig. 13 is an external perspective view of the stand upright from the side of the pole storage cover.

Fig. 14 is an external perspective view of the stand upright from the stand side.

Fig. 15 is an explanatory view for explaining a connection state of the stand rotation shaft and the pole rotation shaft.

Fig. 16 is an explanatory view for explaining an exposure window of the lever accommodating chamber and the lever accommodating cover.

Fig. 17 is a cross-sectional view of the stand, stand upright, and rotation shaft inserted through the holding hole.

Fig. 18 is an enlarged view of the cover inner surface of the lever receiving cover.

Fig. 19 is an enlarged view of the rod front end portion and the wire insertion hole in fig. 17.

Fig. 20 is an enlarged view of the rotary shaft and the seal member in fig. 17.

Fig. 21 is an enlarged view of the 1 st wall portion of the seal member.

Fig. 22 is an explanatory diagram for explaining a modification of the 1 st restriction portion and the 2 nd restriction portion.

Fig. 23 is a cross-sectional view of a seal member of modification 1.

Fig. 24 is a cross-sectional view of an O-ring of modification 2.

Fig. 25 is an enlarged view of the O-ring of fig. 24.

Fig. 26 is a cross-sectional view of the annular wall portion taken along line 26-26 in fig. 25.

Fig. 27 is a cross-sectional view of a modification of the annular wall portion.

Fig. 28 is an explanatory view of a 1 st restriction portion of another embodiment provided on the inner surface of the cover of the lever housing cover.

Fig. 29 is an explanatory view for explaining a problem of the ultrasonic endoscope described in patent document 1.

Detailed Description

[ Structure of ultrasonic inspection System and ultrasonic endoscope ]

Fig. 1 is a schematic view of an ultrasonic inspection system 2 to which the endoscope of the present invention is applied. As shown in fig. 1, the ultrasonic inspection system 2 includes an ultrasonic endoscope 10 that captures an image of the inside of a body cavity (lumen) of a subject, an ultrasonic processor device 12 that generates an ultrasonic image, an endoscope processor device 14 that generates an endoscopic image, a light source device 16 that supplies illumination light for illuminating the inside of the body cavity to the ultrasonic endoscope 10, and a monitor 18 that displays the ultrasonic image and the endoscopic image.

The ultrasonic endoscope 10 corresponds to the endoscope of the present invention, and includes an insertion portion 20, an operation portion 22, and a universal cord 24.

The insertion portion 20 is inserted into various body cavities. The operation unit 22 is connected to the proximal end side of the insertion unit 20, and receives an operation by an operator.

One end of the universal cord 24 is connected to the operation unit 22. The other end of the universal cord 24 is provided with an ultrasonic connector 27 connected to the ultrasonic processor device 12, an endoscope connector 28 connected to the endoscope processor device 14, and a light source connector 30 connected to the light source device 16. A water supply tank 118 is connected to the light source connector 30 via a hose 32 for supplying air and water, and a suction pump 124 is connected to the light source connector via a hose 34 for suction.

The ultrasonic processor device 12 generates an ultrasonic image based on an ultrasonic detection signal output from the ultrasonic endoscope 10. The endoscope processor device 14 generates an endoscopic image from the image pickup signal output from the ultrasonic endoscope 10.

The light source device 16 is connected to an incident end of an insertion portion 20, an operation portion 22, a universal cord 24, and a light guide 128 (see fig. 2) inserted into the light source connector 30. The light source device 16 supplies illumination light to the incident end of the light guide 128. The illumination light is irradiated from the light guide 128 to the observed portion through a pair of illumination windows 90 (see fig. 3) described later.

The monitor 18 is connected to both the ultrasonic processor device 12 and the endoscope processor device 14, and displays an ultrasonic image generated by the ultrasonic processor device 12 and an endoscope image generated by the endoscope processor device 14. The display of these ultrasonic images and endoscopic images may be performed by selectively displaying only one of them or by simultaneously displaying both of them.

The operation unit 22 is provided with a gas supply/water supply button 36 and a suction button 38 in parallel, and a pair of corner buttons 42, an operation lever 43, a treatment tool insertion port 44 such as a forceps opening, and the like.

The insertion portion 20 has a distal end, a proximal end, and a longitudinal axis, and includes a distal end portion 50, a bent portion 52, and a soft portion 54 in this order from the distal end side toward the proximal end side. The front end 50 is formed of a hard member, also referred to as a front end hard portion. An ultrasonic transducer 62 described later is provided at the distal end portion 50, and a balloon 64 for covering the ultrasonic transducer 62 is detachably attached.

One end of the bent portion 52 is connected to the base end side of the distal end portion 50, and the other end is connected to the distal end side of the soft portion 54. The bending portion 52 is configured to be bendable, and is remotely bent by turning the pair of corner buttons 42 described above. This makes it possible to orient the distal end 50 in a desired direction.

The soft portion 54 is thin and long and has flexibility, and connects the bending portion 52 and the operation portion 22.

Fig. 2 is a schematic diagram showing a piping structure of the ultrasonic endoscope 10. As shown in fig. 2, a treatment instrument channel 100, an air supply and water supply line 102, and a balloon line 104, one end of which opens into the internal space of the balloon 64, are provided inside the insertion portion 20 and the operation portion 22.

One end of the treatment instrument channel 100 is connected to a treatment instrument outlet 94 (see fig. 3) described later, and the other end is connected to the treatment instrument insertion port 44 of the operation unit 22. The suction line 106 branches from the treatment instrument channel 100, and the suction line 106 is connected to the suction button 38 of the operation unit 22.

One end of the air supply and water supply line 102 is connected to an air supply and water supply nozzle 92 (see fig. 3) described later, and the other end is branched into an air supply line 108 and a water supply line 110. The air supply line 108 and the water supply line 110 are connected to the air supply and water supply button 36 of the operation unit 22.

One end of the balloon pipe 104 is connected to a supply/discharge port 70a (see fig. 5) opened at a position inside the balloon 64 in the outer peripheral surface of the tip end portion 50, and the other end is branched into a balloon water supply pipe 112 and a balloon water discharge pipe 114. The balloon water supply line 112 is connected to the air supply and water supply button 36, and the balloon water discharge line 114 is connected to the suction button 38.

The air supply/water supply button 36 is connected to one end of an air supply line 116 leading to an air supply pump 129 and one end of a water supply line 120 leading to a water supply tank 118, in addition to the air supply line 108, the water supply line 110, and the balloon water supply line 112. The air supply pump 129 is always operated in ultrasonic observation.

The branch line 122 branches from the gas supply line 116, and the branch line 122 is connected to an inlet (above the liquid surface) of the water supply tank 118. The other end of the water supply source line 120 is inserted into the water supply tank 118 (below the liquid surface). When the internal pressure of the water supply tank 118 increases due to the supply of air from the air supply pump 129 via the branch pipe 122, water in the water supply tank 118 is supplied to the water supply source pipe 120.

The air supply and water supply button 36 uses a well-known two-stage switching button. The air/water supply button 36 is switched between leakage of air supplied from the air supply line 116, ejection of air from the air/water supply nozzle 92, ejection of water from the air/water supply nozzle 92, and supply of water into the balloon 64 in response to an operation by an operator. The specific handover method is a known technique, and the description thereof is omitted (for example, refer to international publication No. 2015/151968).

The suction button 38 is connected to one end of a suction source line 126 in addition to the suction line 106 and the balloon drain line 114. A suction pump 124 is connected to the other end of the suction source line 126. The suction pump 124 also operates throughout the ultrasound observation. The suction button 38 is a two-stage switching button similar to the air supply and water supply button 36.

The suction button 38 is switched between communication with the external (atmospheric) suction source line 126, suction of various suctions from the treatment instrument outlet 94 (see fig. 3), and drainage of water in the balloon 64 in response to an operation by the operator. The specific handover method is a known technique, and the description thereof is omitted (for example, refer to international publication No. 2015/151968).

Returning to fig. 1, the operation lever 43 of the operation unit 22 is used for changing the direction of the treatment instrument guided out from the treatment instrument guide outlet 94 (see fig. 3), which will be described in detail later.

[ Structure of tip portion of insertion portion ]

Fig. 3 is an external perspective view of the distal end portion 50 of the insertion portion 20. Fig. 4 is a left side view of the distal end 50 of the insertion portion 20 when viewed from the distal end side thereof. Fig. 5 is a right side view of the distal end 50 of the insertion portion 20 when viewed from the distal end side thereof. Fig. 6 is an exploded perspective view of the distal end portion 50 of the insertion portion 20. In fig. 3 and 6, the balloon 64 is not illustrated. In fig. 6, the light guide 128 and the endoscope observation section 80 described later are not shown.

As shown in fig. 3 to 6, the distal end portion 50 is provided with an ultrasonic observation portion 60 for acquiring an ultrasonic detection signal and an endoscope observation portion 80 for acquiring an imaging signal from the distal end side toward the proximal end side thereof. A stand 96 capable of changing the direction of guiding out the treatment instrument is provided between the ultrasound observation unit 60 and the endoscope observation unit 80 at the distal end portion 50. The distal end portion 50 includes a balloon 64, a housing member 72 (also referred to as an exterior member or a case), a lever housing cover 76, and a stand assembly 200 (see fig. 6).

The ultrasonic observation unit 60 includes an ultrasonic transducer 62 constituted by a plurality of ultrasonic vibrators. Each ultrasonic vibrator of the ultrasonic transducer 62 is sequentially driven in accordance with a drive signal input from the ultrasonic processor device 12. Thus, each ultrasonic vibrator sequentially generates ultrasonic waves toward the observed region, and receives ultrasonic echoes (echo signals) reflected at the observed region. Then, each ultrasonic vibrator outputs an ultrasonic detection signal (electric signal) corresponding to the received ultrasonic echo to the ultrasonic processor device 12 via a signal cable (not shown) inserted into the insertion portion 20, the universal cord 24, and the like. As a result, an ultrasonic image is generated in the ultrasonic processor device 12.

In order to prevent attenuation of ultrasonic waves and ultrasonic echoes, the balloon 64 is attached to a housing member 72 of the distal end portion 50, which is formed in a bag shape that encloses the ultrasonic transducer 62. The balloon 64 is formed of an elastic material having stretchability, such as latex rubber, and has a stretchable locking ring 66 provided at an opening end thereof. On the other hand, the locking groove 68 is provided between the ultrasonic observation portion 60 of the distal end portion 50 and the rising stage 96 over the entire circumference of the distal end portion 50 in the circumferential direction. The locking ring 66 is fitted into the locking groove 68, whereby the balloon 64 is detachably attached to the distal end portion 50.

The balloon 64 is inserted into the body cavity in a contracted state so as to be in close contact with the outer wall surface of the housing member 72 of the distal end portion 50. When ultrasonic waves are generated from each ultrasonic vibrator of the ultrasonic transducer 62 toward the site to be observed, water (deaerated water or the like) is supplied into the balloon 64 according to the operation of the air/water supply button 36, whereby the balloon 64 is inflated to come into contact with the inner wall of the body cavity. When the insertion portion 20 is pulled out of the body cavity, the water inside the balloon 64 is discharged according to the operation of the suction button 38, and the balloon 64 is contracted similarly to when the insertion portion 20 is inserted into the body cavity.

The endoscope observation portion 80 is provided at the inclined surface portion 86 of the housing member 72 of the distal end portion 50. The inclined surface 86 is provided at a position on the base end side of a treatment instrument outlet 94 described later of the distal end portion 50, and is formed obliquely with respect to the axial direction of the distal end portion 50. The endoscope observation portion 80 includes an observation portion and an illumination portion.

The observation portion of the endoscope observation portion 80 has an observation window 88 (see fig. 3). Although not shown, an objective lens of an observation optical system, a CCD (Charge Coupled Device: charge coupled device) type or CMOS (ComplementaryMetal Oxide Semiconductor: complementary metal oxide semiconductor) type imaging element disposed at an imaging position of the objective lens, and the like are disposed behind the observation window 88. The imaging element captures an observation image obtained from the observation window 88. The imaging device outputs an imaging signal of the observation image to the endoscope processor 14 via a signal cable, not shown, inserted into the insertion portion 20, the universal cord 24, and the like. As a result, an endoscopic image is generated in the endoscope processor device 14.

The illumination unit of the endoscope observation unit 80 includes a pair of illumination windows 90 (see fig. 3), and the light emitting ends of the above-described light guides 128 are disposed behind the respective illumination windows 90. Therefore, as shown in fig. 2 described above, by connecting the light source connector 30 to the light source device 16, the illumination light irradiated from the light source device 16 is guided to each illumination window 90 via the light guide 128, and is irradiated from each illumination window 90 to the front side thereof.

In addition to the observation window 88 and the illumination window 90 described above, the air supply and water supply nozzle 92 is provided near the observation window 88 in the inclined surface portion 86. The air supply/water supply nozzle 92 is connected to one end of the air supply/water supply line 102 shown in fig. 2 described above, and discharges water or air toward the observation window 88 in order to clean foreign matter or the like adhering to the surface of the observation window 88.

The housing member 72 holds or accommodates the above-described respective portions of the ultrasound observation unit 60 and the endoscope observation unit 80, and a stand 96 and a stand assembly 200 described later. The portion of the housing member 72 closer to the base end side than the ultrasonic observation portion 60 is divided into two in the vertical direction in the drawing by taking a plane parallel to the axial direction of the tip portion 50 as a boundary. That is, the case member 72 is configured by connecting the 1 st case member 72a located at the lower side in the drawing and the 2 nd case member 72b located at the upper side in the drawing. Further, the standing stand 96 and the standing stand unit 200 are accommodated between the 1 st housing member 72a and the 2 nd housing member 72 b.

The 1 st housing member 72a holds the ultrasonic observation portion 60 and has the locking groove 68. When the distal end portion 50 is viewed from the distal end side thereof, a groove 74 is formed along the axial direction of the distal end portion 50 on the right side surface (see fig. 5) of the 1 st housing member 72a at a position closer to the distal end side than the locking groove 68. The groove 74 is formed such that at least a part thereof overlaps the ultrasonic transducer 62 in the axial direction of the tip portion 50.

The supply/discharge port 70a, which is the opening on the distal end side of the balloon tube 104 shown in fig. 2, is opened at the base end of the groove 74. Thus, water can be supplied to the interior of the balloon 64 through the water supply/discharge port 70a or water in the interior of the balloon 64 can be discharged.

The 2 nd housing member 72b holds the endoscope observation portion 80 and has a slope 86. A treatment instrument outlet 94 for guiding out a treatment instrument is formed in the upper surface of the 2 nd housing member 72b on the distal end side of the endoscope observation portion 80 (the slope portion 86). When the 1 st housing member 72a and the 2 nd housing member 72b are coupled, a space for accommodating the stand 96, that is, a stand accommodating chamber 94a is formed in the treatment instrument outlet 94.

When the distal end portion 50 is viewed from the distal end side thereof, a partition wall 73 (see fig. 6) constituting the right side surface of the standing platform accommodating chamber 94a is formed so as to extend across both the 1 st housing member 72a and the 2 nd housing member 72 b. Further, fitting holes 75 for fitting the rod storage covers 76 are formed in a crossing manner in positions of the left side surfaces of the 1 st housing member 72a and the 2 nd housing member 72b and facing the rod storage chambers 212 (see fig. 6) of the stand assembly 200.

The treatment instrument channel 100 shown in fig. 2 described above is connected to the standing table accommodating chamber 94a. Therefore, the treatment instrument inserted into the treatment instrument insertion port 44 is introduced into the body cavity from the treatment instrument outlet 94 via the treatment instrument channel 100 and the stand accommodating chamber 94a.

The stand 96 is rotatably mounted to the stand assembly 200 in the stand accommodating chamber 94a via a rotation shaft 216 (see fig. 7) having a split structure, which will be described later. The stand 96 changes the direction of the treatment instrument guided from the treatment instrument channel 100 into the stand accommodating chamber 94a, and guides the treatment instrument from the treatment instrument guide outlet 94. Then, the stand 96 is rotated in the stand accommodating chamber 94a in accordance with the operation of the operation lever 43, whereby the direction of guiding out the treatment instrument guided from the treatment instrument guiding outlet 94 into the body cavity can be changed, which will be described in detail later.

The lever housing cover 76 corresponds to the cover of the present invention, and constitutes a part of the outer peripheral surface of the housing member 72, that is, a part of the outer peripheral surface of the distal end portion 50. The lever receiving cover 76 is detachably attached to the stand assembly 200 by a bolt 77 in a state of being fitted into the fitting hole 75 of the housing member 72. Further, a lid seal member 76a and a 1 st regulating portion 250 (see fig. 17) are provided on a lid inner surface 244 (see fig. 17) of the lever housing lid 76 on the side of the stand assembly 200, which will be described in detail later. Further, an insertion hole 76b through which the bolt 77 is inserted is formed in the lever housing cover 76.

[ Structure of standing Table Assembly ]

Fig. 7 is an exploded perspective view of the stand assembly 200, fig. 8 is a right side view of the stand assembly 200 when the front end portion 50 is viewed from the front end side, and fig. 9 is a front view of the stand assembly 200 when the front end portion 50 is viewed from the front end side.

As shown in fig. 7 to 9 and fig. 6 described above, the stand assembly 200 is formed of, for example, a metallic material having corrosion resistance, and has a base 202 and a partition wall 204 extending from the base 202 toward the front end side. A part of the front end surface of the base 202 constitutes a side surface on the base end side of the standing room 94 a. A communication hole 202a that communicates with the treatment instrument channel 100 connected to the proximal end side thereof is formed in the distal end surface of the base 202. Thereby, the treatment instrument channel 100 and the stand accommodating chamber 94a are connected via the communication hole 202a.

When the stand assembly 200 is viewed from the front end side thereof, the partition wall 204 has a side wall surface 206 that is a left side surface and an opposing wall surface 208 that is a right side surface opposite to the side wall surface 206 and that opposes the stand 96.

The side wall surface 206 is formed with a rod accommodating chamber 212 for accommodating the standing post 210. In other words, the partition 204 is provided between the standing platform 96 (the standing platform accommodating chamber 94 a) and the standing platform upright 210 (the rod accommodating chamber 212).

The partition wall 204 has a 1 st housing chamber wall surface 212a constituting the bottom surface of the rod housing chamber 212 on the side of the standing table 96 and a 2 nd housing chamber wall surface 212b constituting the side surface of the rod housing chamber 212 (refer to fig. 7).

A holding hole 214 that penetrates the partition wall 204 along an axial direction of a rotary shaft 216, which will be described later, that connects the stand 96 and the stand upright 210 to each other, and communicates with the stand accommodating chamber 94a is formed in the 1 st accommodating chamber wall surface 212 a. The holding hole 214 rotatably supports the rotation shaft 216. Further, since the standing upright 210 in the rod accommodating chamber 212 rotates (swings) about the rotation axis 216, the rod accommodating chamber 212 is formed in a fan shape (fan shape) about the rotation axis 216.

A wire insertion hole 224 (see fig. 7) through which an operation wire 222 described later is inserted is formed in the 2 nd housing chamber wall surface 212 b.

The surface side of the lever accommodation chamber 212 facing the lever accommodation cover 76 is open. Accordingly, the rod accommodating chamber 212 has an exposure window 218 (see fig. 7) formed by an edge portion of the 2 nd accommodating chamber wall surface 212b on the rod accommodating cover 76 side, which will be described in detail later. The exposure window 218 exposes the standing post 210 in the rod accommodating chamber 212.

Further, bolt holes 220 that are screwed with the bolts 77 described above are formed in the peripheral region of the rod accommodating chamber 212 in the side wall surface 206, that is, in a region that is different from the region in which the rod accommodating chamber 212 is formed and that is covered with the rod accommodating cover 76. The number of bolts 77 and bolt holes 220 is not particularly limited.

When the stand assembly 200 is viewed from the front end side thereof, the opposing wall surface 208 constitutes the left side surface of the stand accommodating chamber 94 a. A holding hole opening 214a (see fig. 8) is formed in the opposing wall surface 208 as an opening on the standing base 96 side of the holding hole 214. A cutout 208a into which a part of the standing platform 96 enters is formed in the opposing wall surface 208. The notch 208a is shaped so as not to interfere with the rotation of the standing platform 96 around the rotation axis 216.

[ Structure of standing table, standing table upright rod and rotation shaft ]

The standing platform 96 is connected to one end side of the standing platform upright 210 via a rotation shaft 216 which is divided into two structures, which will be described later. Specifically, in the present embodiment, the rotation shaft 216 having a two-piece structure is coupled by the bolts 211, whereby the stand upright 210 and the stand 96 are coupled via the rotation shaft 216 (see fig. 7). Thereby, the standing upright 210 rotates (swings) integrally with the standing table 96 around the rotation shaft 216. An operation wire 222 (see fig. 6) is connected to the other end side of the upright post 210.

The operation wire 222 has a front-end-side connection portion 222a (see fig. 6) connected to the stand upright 210 in the rod accommodating chamber 212 at the front end side thereof. The proximal end of the operation wire 222 is connected to a stand operation mechanism 226 (see fig. 10) in the operation unit 22 through the wire insertion hole 224 in the rod accommodation chamber 212 in the insertion unit 20.

Fig. 10 is a schematic diagram showing an example of the stand operation mechanism 226. As shown in fig. 10, the operation wire 222 has a base end side connecting portion 222b on the base end side thereof, which is connected to the stand operation mechanism 226. The stand operating mechanism 226 includes an operating lever 43 corresponding to an operating member of the present invention, a rotary drum 226A to which the operating lever 43 is coupled and which is rotatable within a predetermined angle range, a crank member 226B coupled to the rotary drum 226A, and a slider 226C coupled to the crank member 226B. The base end side connecting portion 222b is connected to the slider 226C.

When the rotating drum 226A is rotated by operating the operation lever 43, the operation wire 222 is pushed and pulled through the crank member 226B and the slider 226C, and the stand upright 210 swings, and the stand 96 rotates (swings) about the rotation shaft 216 according to the swing of the stand upright 210.

Fig. 11 is an explanatory diagram for explaining the rotation of the stand 96 in accordance with the operation of the operation lever 43. As shown in fig. 11, when the rotating drum 226A is rotated in one direction by operating the operation lever 43, the operation wire 222 is pushed, and the stand upright 210 is rotated in the R1 direction about the rotation shaft 216, so that the stand 96 is tilted. On the other hand, as indicated by reference numeral XIB, when the operation lever 43 is operated to rotate the rotary drum 226A in the opposite direction, the operation wire 222 is pulled, and the stand upright 210 is rotated in the R2 direction opposite to the R1 direction about the rotation shaft 216, so that the stand 96 is raised. In this way, the operation wire 222 can displace (raise and fall) the raising stage 96 by rotating the rotation shaft 216 via the raising stage upright 210 by the operation of the operation lever 43.

Fig. 12 is an external perspective view of the standing table 96. As shown in fig. 12, the surface of the stand 96 facing the communication hole 202a is an arcuate guide surface 96a for guiding the treatment instrument guided into the stand accommodating chamber 94a toward the treatment instrument outlet 94. A stand rotating shaft 216a, which constitutes a part of the rotating shaft 216 and corresponds to the 2 nd rotating shaft of the present invention, is coupled (including integrally formed) to the base end portion of the stand 96. The method of connecting the stand 96 and the stand rotation shaft 216a is not particularly limited, and the stand 96 and the stand rotation shaft may be formed separately from each other instead of integrally.

The stand rotation shaft 216a is inserted into the holding hole 214 from the stand accommodating chamber 94a side. As described above, one end of the stand rotation shaft 216a is connected to the base end of the stand 96, and the other end thereof has the connecting portion 230a corresponding to the 2 nd connecting portion of the present invention. The coupling portion 230a has an axial shape protruding toward the stand column 210 along the axial direction of the rotary shaft 216.

Further, a screw hole 232 that is screwed with the tip end portion of the bolt 211 shown in fig. 7 and the like described above is formed in the stand rotation shaft 216a (the coupling portion 230 a). Further, a 1 st groove wall surface 234a and a groove bottom surface 234b which constitute a part of a seal member mounting groove 234 (see fig. 15) described later are formed on the outer peripheral surface of the other end side of the stand rotation shaft 216a.

Fig. 13 is an external perspective view of the stand upright 210 viewed from the side of the lever housing cover 76. Fig. 14 is an external perspective view of the stand upright 210 as seen from the stand 96 side.

As shown in fig. 13 and 14, the upright post 210 has a post main body portion 210a, a post base end portion 210b, and a post tip end portion 210c. The side surface of the upright post 210 on the side opposite to the rod storage cover 76 (the side opposite to the rotation axis side of the present invention) is referred to as a 1 st rod side surface 246. In the 1 st rod side surface 246, the side surface of the rod main body 210a is the main body side surface 246a. The side surface of the upright post 210 on the opposite side (the rotation axis side of the present invention) from the 1 st pole side surface 246 is the 2 nd pole side surface 248.

The lever base end 210b is provided on one end side of the lever body 210 a. A pole shaft 216b, which constitutes a part of the shaft 216 and corresponds to the 1 st rotation shaft of the present invention, is connected to the pole base end 210 b. The method of connecting the rod rotation shaft 216b and the rod base end 210b is not particularly limited, and the two may be formed separately from each other instead of integrally.

The lever distal end portion 210c is provided on the other end side of the lever main body portion 210a, and has a wire connecting portion 235. The distal end side connecting portion 222a of the operation wire 222 described above is connected to the wire connecting portion 235.

The rod rotation shaft 216b is inserted into the holding hole 214 from the rod accommodation chamber 212 side. As described above, one end of the pole rotation shaft 216b is connected to the pole base end 210b of the stand pole 210. At this time, as shown in fig. 17 described later, when the stand assembly 200 is viewed from the front end side thereof, the stand rotation shaft 216b is provided at a position that is pulled toward the stand 96 side (the 2 nd direction DR side in fig. 17 described later) than the stand 210. As described above with reference to fig. 29, even if the length of the upright post 210 is increased to improve the upright performance, the post rotation shaft 216b is less likely to interfere with the inner peripheral surface of the distal end portion 50, and therefore, the diameter of the distal end portion 50 can be prevented from increasing (see fig. 17). That is, the diameter of the distal end portion 50 can be reduced.

The other end of the upright rotary shaft 216b has a coupling portion 230b corresponding to the 1 st coupling portion of the present invention. The coupling portion 230b is provided on the end surface of the other end side of the upright rotary shaft 216b (the surface facing the upright rotary shaft 216 a), and is a fitting hole into which the coupling portion 230a described above is fitted.

Further, the upright rotation shaft 216b is formed with an insertion hole 236 through which the bolt 211 shown in fig. 7 and the like described above is inserted. The end surface of the other end of the rod rotation shaft 216b and the outer peripheral portion of the coupling portion 230b function as a 2 nd groove wall surface 234c that forms a part of a seal member mounting groove 234 (see fig. 15) described later.

Fig. 15 is an explanatory diagram for explaining a connection state of the stand rotation shaft 216a and the upright rotation shaft 216 b. As shown in fig. 12 to 15, the connection portion 230a of the stand rotation shaft 216a and the connection portion 230b of the pole rotation shaft 216b are connected to each other in the holding hole 214 shown in fig. 7 and the like, which have been described above. At this time, the

coupling parts

230a and 230b have a shape in which the stand rotation shaft 216a and the upright rotation shaft 216b are coupled so as not to rotate relative to each other. The shape of the connecting

portions

230a and 230b is not limited to the shape shown in the drawings, and may be changed as appropriate.

The bolt 211 is inserted into the insertion hole 236 from one end side of the upright rotation shaft 216b in a state where the connecting

portions

230a and 230b are connected, and then is screwed into the screw hole 232 of the upright rotation shaft 216 a. Thus, the standing platform 96, the standing platform upright 210, and the rotation shaft 216 are integrated. As a result, the stand 96 and the stand upright 210 integrally rotate (swing) about the rotation shaft 216 (the stand rotation shaft 216a and the upright rotation shaft 216 b).

By connecting the stand rotation shaft 216a and the pole rotation shaft 216b, an annular seal member mounting groove 234 is formed in the outer peripheral surface of the rotation shaft 216 along the circumferential direction thereof by the 1 st groove wall surface 234a, the groove bottom surface 234b, and the 2 nd groove wall surface 234 c. In other words, the rotation shaft 216 is divided into the stand rotation shaft 216a and the pole rotation shaft 216b with the 2 nd groove wall surface 234c on the 1 st direction DL side (corresponding to the stand pole side of the present invention with reference to fig. 17) of the seal member mounting groove 234 as a boundary. A seal member 256 (see fig. 17) to be described later is attached to the seal member attachment groove 234.

[ Structure of rod storage cover ]

Fig. 16 is an explanatory view for explaining the exposure window 218 of the rod accommodation chamber 212 and the rod accommodation cover 76. As shown in fig. 16, the stand upright 210 rotates (swings) about the rotation shaft 216 in the rod accommodating chamber 212. Accordingly, the exposure window 218 has a shape that exposes a rotation range of the standing post 210 that rotates around the rotation shaft 216. Accordingly, the exposure window 218 can expose the 1 st pole side surface 246 of the stand pole 210 at each rotational position of the stand pole 210.

The lever housing cover 76 is fitted into the fitting hole 75 of the housing member 72 to cover at least the exposure window 218 of the lever housing chamber 212. The rod storage cover 76 removably covers the exposure window 218 (rod storage chamber 212) by screwing the bolt 77 into the bolt hole 220 of the stand assembly 200 or removing the bolt 77 from the bolt hole 220 through the insertion hole 76 b. In this way, even in the ultrasonic endoscope 10 in which the distal end portion 50 is configured as a detachable cover, such as a side-view endoscope (e.g., a duodenoscope), the exposure window 218 (the rod accommodating chamber 212) can be exposed by detaching the rod accommodating cover 76 from the stand assembly 200. As a result, the stand bar 210 of the ultrasonic endoscope 10 and a sealing member 256 (see fig. 17) described later can be replaced or cleaned easily.

In the present embodiment, the lever housing cover 76 is attached to the stand assembly 200 (the fitting hole 75 of the housing member 72) using the bolt 77, but an attachment method other than the bolt 77 may be employed.

The cap seal member 76a corresponds to the cap airtight holding member of the present invention, and is formed of an elastic material such as rubber, for example. The cover sealing member 76a is provided along an edge portion of the cover inner surface 244 (see fig. 17) of the lever housing cover 76, for example, and has a substantially frame shape. When the lever receiving cover 76 is attached to the stand assembly 200, the cover sealing member 76a is pressed against the side wall surface 206 (the peripheral edge portion of the exposure window 218) of the stand assembly 200. Thereby, the airtight seal between the rod storing cover 76 and the exposure window 218 (rod storing chamber 212) can be maintained.

The position where the lid sealing member 76a is provided on the lid inner surface 244 (see fig. 17) and the shape of the lid sealing member 76a are not particularly limited as long as the airtight seal between the lever housing lid 76 and the exposure window 218 can be maintained. Further, instead of providing the lid sealing member 76a on the lid inner surface 244, a lid airtight holding member such as the lid sealing member 76a may be provided on the side wall surface 206 of the stand assembly 200, or a sealing material (lid airtight holding member) may be applied to the joint surface of the rod storage lid 76 and the stand assembly 200.

[ Structure of restriction 1 and restriction 2 ]

Fig. 17 is a cross-sectional view of the standing platform 96, the standing platform upright 210, and the rotation shaft 216 inserted through the holding hole 214. In fig. 17, the operation line 222 is not illustrated. In the drawing, the direction from the stand 96 toward the stand upright 210 is referred to as the 1 st direction DL, and the direction opposite to the 1 st direction DL is referred to as the 2 nd direction DR, among directions parallel to the axial direction of the rotary shaft 216.

As shown in fig. 17, a gap is secured between the two side surfaces of the standing table 96 on the 1 st DL side and the 2 nd DR side and the inner wall surface (the opposing wall surface 208 and the like in fig. 8) of the standing table accommodating chamber 94a opposing the two side surfaces, respectively. This can improve the cleaning performance such as the inflow of the cleaning liquid and the like, the insertion performance and the dewatering performance of the cleaning brush, and the easiness of the cleaning work. As described above, in the present embodiment, since a gap is secured between both side surfaces of the stand 96 and the inner wall surface of the stand accommodating chamber 94a, the displacement in the 1 st direction DL and the displacement in the 2 nd direction DR of the stand 96, the stand upright 210, and the rotation shaft 216 (hereinafter, simply referred to as the stand upright 210 and the like) are restricted.

Specifically, in the present embodiment, the 1 st restriction portion 250 provided on the lid inner surface 244 of the rod storage lid 76 restricts the displacement of the 1 st direction DL of the stand upright 210 and the like, and the 2 nd restriction portion 252 provided on the 1 st housing chamber wall surface 212a of the rod housing chamber 212 restricts the displacement of the 2 nd direction DR of the stand upright 210 and the like.

Fig. 18 is an enlarged view of the cover inner surface 244 of the lever receiving cover 76. As shown in fig. 18 and fig. 17 described above, the 1 st regulating portion 250 is provided in the cover inner surface 244 at a position facing the main body side surface 246a of the lever main body 210a of the stand upright 210.

The 1 st restriction portion 250 may be formed of the same material as the lever receiving cover 76, or may be formed of a different material (an elastic material, a low friction material, or the like). For example, the 1 st restriction portion 250 has a shape protruding from the lid inner surface 244 in the 2 nd direction DR when viewed from the front end side of the stand assembly 200 (see fig. 17). Specifically, when the pole housing cover 76 is attached to the stand assembly 200, the 1 st regulating portion 250 is adjusted to a projecting amount that is close to or in contact with the main body portion side surface 246a of the stand upright 210 in the pole housing chamber 212.

For example, when the lid inner surface 244 of the pole housing lid 76 is viewed from the front side (see fig. 18), the 1 st restriction portion 250 has a shape of a trajectory of a rotation along at least a part of the main body side surface 246a of the upright post 210 that rotates in the above-described R1 direction and R2 direction (see fig. 11) around the rotation axis 216. Thus, the 1 st restriction portion 250 approaches or abuts against the main body portion side surface 246a of the upright post 210 at each rotational position of the upright post 210 that rotates about the rotational axis 216.

In this way, the 1 st restriction portion 250 is interposed between the main body portion side surface 246a and the cover inner surface 244 at each rotational position of the stand upright 210, and can restrict the displacement of the stand upright 210 or the like in the 1 st direction DL (displacement toward the rod storage cover 76 side).

Fig. 19 is an enlarged view of the rod tip 210c (wire connecting portion 235) and the wire insertion hole 224 in fig. 17. As shown in fig. 19, when the wire insertion hole 224 opened in the 2 nd housing chamber wall surface 212b is viewed from the front end side (front face of the front end side) of the riser assembly 200, the formation position of the wire insertion hole 224 in the 2 nd housing chamber wall surface 212b is adjusted so that the center position CH of the wire insertion hole 224 is displaced to the 2 nd direction DR side (riser side of the present invention) than the position of the rod front end portion 210c shown by the straight line LT in the drawing.

In this case, when the tip-side connecting portion 222a (see fig. 11, etc.) of the operation wire 222 is connected to the wire connecting portion 235 of the lever tip portion 210c, a force in the 2 nd direction DR is applied from the operation wire 222 to the lever tip portion 210c in the axial direction of the rotation shaft 216. As a result, the displacement of the upright post 210 or the like in the 1 st direction DL can be more reliably restricted. When the wire insertion hole 224 is viewed from the front end side of the stand assembly 200, the center position CH may be the same position as the position of the rod front end portion 210c in the axial direction of the rotation shaft 216.

Returning to fig. 17, the 2 nd regulating portion 252 is provided in the 1 st housing chamber wall surface 212a of the rod housing chamber 212 at a position facing the 2 nd rod side surface 248 of the stand upright 210 (the rod main body portion 210 a). The 2 nd restriction portion 252 may be formed of the same material as the partition wall 204, or may be formed of a different material (an elastic material, a low friction material, or the like).

For example, the 2 nd restricting portion 252 has a shape protruding from the 1 st housing chamber wall surface 212a in the 1 st direction DL when viewed from the front end side of the riser block 200. Specifically, the 2 nd regulating portion 252 is adjusted to a projecting amount that is close to or in contact with the standing post 210 (the post main body portion 210 a) in the post accommodating chamber 212.

Although not shown, when the 1 st housing chamber wall surface 212a is viewed from the front side, the 2 nd restricting portion 252 has a shape of a trajectory along at least a part of the 2 nd rod side surface 248 of the upright post 210 rotating about the rotation axis 216. As a result, the 2 nd regulating portion 252 is also brought close to or brought into contact with the upright post 210 (the main body side surface 246 a) at each rotational position of the upright post 210 that rotates about the rotation axis 216.

In this way, the 2 nd restricting portion 252 is interposed between the 2 nd pole side surface 248 and the 1 st housing chamber wall surface 212a at each rotational position of the stand pole 210, and thus can restrict the displacement of the stand pole 210 and the like in the 2 nd direction DR.

[ Structure of sealing Member ]

Fig. 20 is an enlarged view of the rotary shaft 216 and the seal member 256 in fig. 17. As shown in fig. 20 and fig. 17 described above, an annular seal member mounting groove 234 is formed in the outer peripheral surface of the rotary shaft 216, and is composed of a 1 st groove wall surface 234a, a groove bottom surface 234b, and a 2 nd groove wall surface 234 c. The seal member mounting groove 234 is formed so as to extend from a position closer to the 1 st direction DL side (the standing upright side of the present invention) than the holding hole opening 214a of the holding hole 214 described above to a position closer to the 2 nd direction DR side (the standing upright side of the present invention) than the holding hole opening 214a in a state where the standing upright 210 and the like are restricted by the 1 st restricting portion 250 and the 2 nd restricting portion 252. That is, the seal member mounting groove 234 is located partially inside the holding hole 214 in the axial direction of the rotary shaft 216, and the rest is located outside the holding hole 214. Further, an annular seal member 256 is fitted to the seal member mounting groove 234.

The seal member 256 is inserted through the rotary shaft 216, and maintains the airtight seal between the outer peripheral surface of the rotary shaft 216 and the inner wall surface of the holding hole 214. The end portion of the sealing member 256 on the 2 nd direction DR side is exposed (protrudes) from the holding hole opening 214a of the holding hole 214 to the 2 nd direction DR side. Therefore, even when a liquid such as blood or water (hereinafter, simply referred to as a liquid) enters the standing-table accommodating chamber 94a, the sealing member 256 prevents the liquid from entering between the outer peripheral surface of the rotary shaft 216 and the inner wall surface of the holding hole 214.

The seal member 256 has a so-called oil seal structure, and includes a 1 st wall portion 256a, a 2 nd wall portion 256b, a 3 rd wall portion 256c, and a compression spring 256d, each of which is formed in a ring shape. The 1 st wall portion 256a, the 2 nd wall portion 256b, and the 3 rd wall portion 256c are integrally formed of, for example, a resin material having a low friction coefficient.

Although not shown, the 1 st wall 256a has a well-known lip (for example, a dust lip, a lip tip end portion, and a seal lip) that is in close contact with the groove bottom surface 234b of the seal member mounting groove 234. The 2 nd wall portion 256b is a well-known back face and is in close contact with the 1 st wall surface 234a of the seal member mounting groove 234. The 3 rd wall portion 256c is a well-known fitting portion having a close contact area U1 that is in close contact with the inner wall surface of the holding hole 214 and an exposed area U2 that is located closer to the 2 nd direction DR side (i.e., in the standing table accommodating chamber 94 a) than the holding hole opening 214a of the holding hole 214.

The compression spring 256d is disposed between the 1 st wall portion 256a and the 3 rd wall portion 256 c. The compression spring 256d is a biasing member that biases one of the 1 st wall portion 256a and the 3 rd wall portion 256c in a direction away from the other. Accordingly, the 1 st wall portion 256a can be pressure-bonded to the groove bottom surface 234b, and the 3 rd wall portion 256c can be pressure-bonded to the inner wall surface of the holding hole 214, so that the sealing function of the sealing member 256 can be improved. In addition, a biasing member other than the compression spring 256d may be used, or an elastic member such as rubber may be used instead of the biasing member.

Fig. 21 is an enlarged view of the 1 st wall portion 256a of the seal member 256. Note that reference sign XXIA in fig. 21 indicates a state before the stand rotation shaft 216a and the upright rotation shaft 216b are coupled, and reference sign XXIB in fig. 21 indicates a state after the stand rotation shaft 216a and the upright rotation shaft 216b are coupled.

As shown by reference sign XXIA in fig. 21, in the axial direction of the rotation shaft 216, the width W1 of the 1 st wall portion 256a is formed longer than the width W2 of the groove bottom surface 234b of the seal member mounting groove 234. Therefore, as shown by reference sign XXIB in fig. 21, after the stand rotation shaft 216a and the upright rotation shaft 216b are coupled, the seal member 256 is mounted in the seal member mounting groove 234 in a state in which the 1 st wall portion 256a thereof is compressed in the axial direction of the rotation shaft 216. Accordingly, the 2 nd wall portion 256b of the seal member 256 is pressed against the 1 st wall surface 234a of the seal member mounting groove 234 by the elastic restoring force of the 1 st wall portion 256 a. As a result, the sealing function of the sealing member 256 can be improved.

The 3 rd wall portion 256c of the seal member 256 has higher durability (higher rigidity) than the 1 st wall portion 256a and the 2 nd wall portion 256 b. Therefore, by rotating the seal member 256 integrally with the rotation shaft 216, even if the 3 rd wall portion 256c is in sliding contact with the inner wall surface of the holding hole 214 (particularly, the edge portion of the holding hole opening 214 a), breakage and degradation of the 3 rd wall portion 256c can be prevented. That is, in general O-rings, seals, and the like, if stress is applied by sliding contact with the inner wall surface of the holding hole 214, there is a possibility that the sealing member 256 will be cut or twisted, but such a problem can be suppressed. In addition, the 3 rd wall 256c may be formed to have a width in the axial direction of the rotation shaft 216 longer than the width W2 of the groove bottom surface 234b, similarly to the 1 st wall 256 a.

In addition, in the cleaning process of the seal member 256, the portion of the 2 nd wall portion 256b exposed in the stand accommodating chamber 94a and the exposed region U2 of the 3 rd wall portion 256c may be easily flown in with the cleaning liquid or the like, and the portion of the cleaning brush may be easily contacted with the cleaning liquid, so that the cleaning performance and the ease of the cleaning operation may be improved.

[ Effect of the present embodiment ]

As described above, in the ultrasonic endoscope 10 of the present embodiment, the 1 st restriction portion 250 is provided on the cover inner surface 244 of the shaft housing cover 76 so as to be interposed between the main body portion side surface 246a and the cover inner surface 244 at each rotational position of the stand bar 210. Thus, even when the length of the stand upright 210 is increased to improve the raising performance, the displacement of the stand upright 210 or the like in the 1 st direction DL can be restricted by the 1 st restricting portion 250 without making the distal end portion 50 larger in diameter as shown in fig. 29 described above. As a result, the displacement of the stand bar 210 and the like in the 1 st direction DL can be restricted, and the stand performance of the stand bar 210 can be improved, and the diameter of the distal end portion 50 can be reduced.

In the present embodiment, the 2 nd restricting portion 252 is provided on the 1 st housing chamber wall surface 212a of the rod housing chamber 212, so that the displacement of the stand upright 210 or the like in the 2 nd direction DR can be restricted. Therefore, even when gaps are secured between the inner wall surfaces of the erection table accommodating chamber 94a and the both side surfaces of the 1 st and 2 nd directions DL and DR of the erection table 96 in order to improve the cleaning performance and the cleaning easiness in the erection table accommodating chamber 94a, the erection table pole 210 and the like can be prevented from being displaced in the axial direction of the rotation shaft 216.

In the present embodiment, the seal member 256 having a structure capable of being brought into close contact (pressure-contact) with the 1 st groove wall surface 234a and the groove bottom surface 234b of the seal member mounting groove 234 and the inner wall surface of the holding hole 214 is mounted to the seal member mounting groove 234, so that the airtight seal between the outer peripheral surface of the rotary shaft 216 and the inner wall surface of the holding hole 214 can be reliably maintained.

[ modification of the 1 st restriction portion and the 2 nd restriction portion ]

Fig. 22 is an explanatory diagram for explaining a modification of the 1 st restriction portion 250 and the 2 nd restriction portion 252. In the above embodiment, the 1 st restriction portion 250 is provided on the lid inner surface 244 of the lever accommodation lid 76, and the 2 nd restriction portion 252 is provided on the 1 st accommodation chamber wall surface 212a of the lever accommodation chamber 212.

In contrast, as shown in fig. 22, the 1 st restriction portion 250 may be provided on the main body side surface 246a of the stand upright 210. In this case, the 1 st restriction portion 250 is adjusted to a protruding amount close to or abutting against the cover inner surface 244. Therefore, the 1 st restriction portion 250 is interposed between the main body portion side surface 246a and the cover inner surface 244 at each rotational position of the stand bar 210 that rotates about the rotation axis 216, as in the above embodiment, and therefore, displacement of the stand bar 210 and the like in the 1 st direction DL can be restricted.

The 2 nd restricting portion 252 may be provided on the 2 nd pole side surface 248 of the upright pole 210. In this case, the 2 nd restriction portion 252 is adjusted to a protruding amount that is close to or in contact with the 1 st accommodation chamber wall surface 212a of the rod accommodation chamber 212. Therefore, as in the above embodiment, the 2 nd restricting portion 252 is interposed between the 2 nd pole side surface 248 and the 1 st housing chamber wall surface 212a at each rotational position of the stand pole 210 rotating around the rotation axis 216, and therefore, displacement of the stand pole 210 and the like in the 2 nd direction DR can be restricted.

Although not shown, one of the 1 st restriction portions 250 may be provided on the lid inner surface 244 and the other may be provided on the body portion side surface 246a by dividing the 1 st restriction portion 250 into two along the axial direction of the rotation shaft 216. Then, by adjusting the positions of both sides and the like so that one of the 1 st restriction portions 250, which are divided into two, is brought into close proximity to or in contact with the other at each rotational position of the stand upright 210, displacement of the stand upright 210 and the like in the 1 st direction DL can be restricted.

Similarly, the 2 nd restriction portion 252 may be divided into two in the axial direction of the rotation shaft 216, one of the 2 nd restriction portions 252 divided into two may be provided on the 1 st housing chamber wall surface 212a, and the other may be provided on the 2 nd rod side surface 248. Then, by adjusting the positions of both sides and the like so that one of the two-divided 2 nd restricting portions 252 is brought into close proximity to or in contact with the other at each rotational position of the stand upright 210, the displacement of the stand upright 210 and the like in the 2 nd direction DR can be restricted.

Modification 1 of sealing Member

Fig. 23 is a cross-sectional view of a seal member 260 of modification 1, which is different from the seal member 256 of the above embodiment. In the above embodiment, the seal member 256 is disposed between the outer peripheral surface of the rotation shaft 216 and the inner wall surface of the holding hole 214, but an annular seal member 260 may be disposed between the partition wall 204 and the rising stage 96.

As shown in fig. 23, when the seal member 260 is disposed between the partition wall 204 and the standing table 96, instead of forming the seal member mounting groove 234 on the outer peripheral surface of the rotary shaft 216, one end of the rotary shaft 216 (standing table rotary shaft 216 a) on the 2 nd direction DR side is extended to a position farther in the 2 nd direction DR than the holding hole opening 214a of the holding hole 214. Thus, a space in which the seal member 260 can be disposed can be formed between the opposing wall surface 208 of the partition wall 204 and the standing platform 96.

The seal member 260 has an insertion hole 262 through which the rotation shaft 216 is inserted. The diameter of the insertion hole 262 is formed larger than the diameter of the rotation shaft 216. The seal member 260 has a so-called oil seal structure, and includes a 4 th wall portion 260a, a 5 th wall portion 260b, a 6 th wall portion 260c, and a compression spring 260d, each of which is formed in a ring shape. The 4 th wall 260a, the 5 th wall 260b, and the 6 th wall 260c are integrated.

The 4 th wall 260a is one of a well-known lip and a fitting portion, and is in close contact with the opposing wall surface 208 of the partition 204. The 5 th wall 260b is the other of the well-known lip and the fitting portion, and is in close contact with the 1 st direction DL side surface (the side surface connected to the rotation shaft 216) of the standing table 96. The 6 th wall 260c is a well-known back surface, and forms an outer peripheral surface of the seal member 260.

The compression spring 260d is disposed between the 4 th wall portion 260a and the 5 th wall portion 260 b. The compression spring 260d is a biasing member that biases one of the 4 th wall 260a and the 5 th wall 260b in a direction away from the other. This allows the 4 th wall 260a to be in pressure contact with the opposing wall 208, and the 5 th wall 260b to be in pressure contact with the 1 st DL side surface of the stand 96. As a result, the sealing member 260 can prevent liquid from entering between the outer peripheral surface of the rotary shaft 216 and the inner wall surface of the holding hole 214, similarly to the sealing member 256 of the above embodiment. In addition, a biasing member other than the compression spring 260d may be used, or an elastic member such as rubber may be used instead of the biasing member.

Modification 2 of the sealing Member

Fig. 24 is a cross-sectional view of an O-ring 270 of modification 2, which is different from the seal member 256 of the above embodiment. Fig. 25 is an enlarged view of the O-ring 270 of fig. 24. In the above embodiment, the seal member 256 is used as the seal member of the present invention, and the seal member 256 is exposed from the holding hole opening 214a to the 2 nd direction DR side.

On the other hand, as shown in fig. 24 and 25, an annular O-ring 270 may be provided between the outer peripheral surface of the rotary shaft 216 and the inner wall surface of the holding hole 214 and on the 1 st direction DL side of the holding hole opening 214a (refer to a straight line LH in fig. 24).

In this case, the seal member attachment groove 234 (the 1 st groove wall surface 234a, the groove bottom surface 234b, and the 2 nd groove wall surface 234 c) is formed on the outer peripheral surface of the rotary shaft 216 at a position closer to the 1 st direction DL side (the standing stand upright side of the present invention) than the holding hole opening 214 a. An annular wall portion 272, which is an annular wall portion of the 1 st groove wall surface 234a constituting the 2 nd direction DR side (the standing table side of the present invention) of the seal member mounting groove 234, is formed along the circumferential direction of the outer peripheral surface of the rotary shaft 216 (the standing table rotary shaft 216 a).

The O-ring 270 corresponds to the sealing member of the present invention, and is disposed between the outer peripheral surface of the rotary shaft 216 and the inner wall surface of the holding hole 214 by being attached to the sealing member attachment groove 234. By this O-ring 270, the airtight seal between the outer peripheral surface of the rotary shaft 216 and the inner wall surface of the holding hole 214 can be maintained.

Fig. 26 is a cross-sectional view of annular wall portion 272 taken along line 26-26 in fig. 25. As shown in fig. 26 and fig. 25 described above, the annular wall portion 272 has a shape that covers a part of the seal side surface 270a facing the 1 st groove wall surface 234a of the outer surface of the O-ring 270. In other words, the annular wall portion 272 has a shape such that another portion (except a part) of the seal side surface 270a is exposed into the standing platform accommodating chamber 94a through the holding hole opening 214 a.

Specifically, a plurality of D-cuts 272a (corresponding to the cut portions of the present invention) parallel to the axial direction of the rotary shaft 216 are formed on the outer peripheral surface of the annular wall portion 272 at equal angular intervals with respect to the center of the rotary shaft 216. Thereby, a gap 274 is formed between the inner wall surface of the holding hole 214 and the D-cut 272a of the annular wall portion 272. As a result, during the cleaning process of the ultrasonic endoscope 10, the cleaning brush can be brought into contact with the O-ring 270 through the gap 274, or the cleaning liquid or the like can be flowed into the O-ring 270. As a result, the cleaning performance of the seal side surface 270a of the O-ring 270 is improved, and the cleaning work can be easily performed.

In fig. 26, 8D-cuts 272a are formed in the outer peripheral surface of the annular wall 272 so that the cross-sectional shape of the outer peripheral surface of the annular wall 272, more specifically, the cross-sectional shape of the surface perpendicular to the axial direction of the rotary shaft 216 is octagonal, but the number of D-cuts 272a formed in the outer peripheral surface of the annular wall 272 may be 7 or less or 9 or more. The cross-sectional shape of the outer peripheral surface of the annular wall portion 272 may be formed in an arbitrary polygonal shape (the number of D-cuts 272a is 3 or more).

Fig. 27 is a cross-sectional view of a modification of the annular wall portion 272 shown in fig. 26. As shown in fig. 27, instead of forming the D-cut 272a, the outer peripheral surface of the annular wall 272 may be formed to have a smaller diameter than the rotary shaft 216. For example, the outer peripheral surface of the annular wall portion 272 is formed to be lower Δr=0.1 mm over the entire circumference thereof with respect to the outer peripheral surface of the rotary shaft 216. Even in this case, since the gap 274 is formed between the inner wall surface of the holding hole 214 and the outer peripheral surface of the annular wall portion 272, the cleaning performance of the seal side surface 270a of the O-ring 270 is improved, and the cleaning work can be easily performed.

Further, the outer peripheral surface of the annular wall portion 272 may be formed in any shape as long as a gap 274 can be formed between the inner wall surface of the holding hole 214 and the outer peripheral surface of the annular wall portion 272.

[ others ]

In the above embodiments, the sealing

members

256 and 260 and the O-ring 270 are described as the sealing member of the present invention, but the kind, shape, arrangement position, and the like of the sealing member are not particularly limited as long as the airtightness between the outer peripheral surface of the rotary shaft 216 and the inner wall surface of the holding hole 214 can be ensured.

In the above embodiment, the rotation shaft 216 has a structure divided into two parts, i.e., the stand rotation shaft 216a and the upright rotation shaft 216b, but may be, for example, a non-divided structure as shown in fig. 29 described above.

In the above-described embodiment, the 1 st restriction portion 250 is provided on the lid inner surface 244 of the lever housing lid 76 that forms a part of the outer peripheral surface of the tip portion 50, but the 1 st restriction portion 250 may be provided on the inner lid of the double lid as shown in fig. 29 described above.

In the above embodiment, the ultrasonic endoscope 10 has been described as an example, but the present invention can also be applied to an endoscope provided with a stand 96 for guiding a treatment tool, for example, a side view endoscope such as a duodenoscope.

[ appendix ]

As can be understood from the description of the embodiments described in detail above, the present specification includes disclosure of various technical ideas including the inventions shown below.

Fig. 28 is an explanatory view of a 1 st restriction portion 254 of another embodiment provided on the cover inner surface 244 of the lever receiving cover 76. As shown in fig. 28, the 1 st regulating portion 254 is provided on the cover inner surface 244 of the lever housing cover 76 at a position facing the rotation shaft 216 (the upright rotation shaft 216 b). When the pole housing cover 76 is attached to the stand assembly 200, the 1 st regulating portion 254 is adjusted to a projecting amount that is close to or in contact with the 1 st direction DL-side end portion of the rotation shaft 216 (the pole rotation shaft 216 b). Accordingly, since the 1 st regulating portion 254 is interposed between the rotation shaft 216 and the cover inner surface 244 at each rotation position of the stand bar 210, the displacement of the stand bar 210 and the like in the 1 st direction DL can be regulated as in the above-described embodiment.

Symbol description

2-ultrasonic inspection system, 10-ultrasonic endoscope, 12-ultrasonic processor device, 14-ultrasonic processor device, 16-light source device, 18-monitor, 20-insertion portion, 22-operation portion, 24-universal cord, 27-ultrasonic connector, 28-connector for endoscope, 30-connector for light source, 32-hose, 34-hose, 36-air supply and water supply button, 38-suction button, 42-angle button, 43-operation lever, 44-treatment instrument insertion port, 50-front end portion, 52-bending portion, 54-soft portion, 60-ultrasonic observation portion, 62-ultrasonic transducer, 64-balloon, 66-locking ring, 68-locking groove, 70 a-supply and discharge port, 72-housing member, 72 a-1 st housing member, 72 b-2 nd housing member, 73-partition wall, 74-groove portion, 75-fitting hole, 76-stem receiving cover, 76 a-cap sealing member, 76 b-insertion hole, 77-bolt, 77 b-insertion hole, 80-endoscopic observation portion, 86-slope portion, 88-observation window, 90-illumination window, 92-air supply and water supply nozzle, 94-treatment instrument outlet port, 94 a-stand accommodating chamber, 96-stand, 96 a-guide surface, 100-treatment instrument channel, 102-air supply line, 104-balloon line, 106-suction line, 108-air supply line, 110-water supply line, 112-balloon supply line, 114-balloon drain line, 116-air supply line, 118-water supply tank, 120-water supply line, 122-branching line, 124-suction pump, 126-suction source line, 128-light guide, 129-air supply pump, 200-stand assembly, 202-base, 202 a-communication hole, 204-partition, 206-side wall, 208-opposite wall, 208 a-notch, 210-stand pole, 210 a-pole body, 210B-pole base end, 210C-pole front end, 211-bolt, 212-pole housing chamber, 212 a-1 st housing chamber wall, 212B-2 nd housing chamber wall, 214-holding hole, 214 a-holding hole opening, 216-rotation axis, 216A-stand rotation axis, 216B-pole rotation axis, 218-exposed window, 220-bolt hole, 222-operating wire, 222 a-front end side coupling portion, 222B-base end side coupling portion, 224-wire insertion hole, 226-stand operating mechanism, 226A-rotating drum, 226B-crank member, 226C-slider, 230 a-coupling portion, 230B-coupling portion, 232-threaded hole, 234-seal member installation groove, 234 a-1 st groove wall surface, 234B-groove bottom surface, 234C-2 nd groove wall surface, 235-wire coupling portion, 236-insertion hole, 244-cover inner surface, 246-1 st rod side surface, 246A-main body portion side surface, 248-2 nd rod side surface, 250-1 st restriction portion, 252-2 nd restriction portion, 254-1 st restriction portion, 256-seal member, 256A-1 st wall portion, 256 b-2 nd wall portion, 256 c-3 rd wall portion, 256D-compression spring, 260-seal member, 260 a-4 th wall portion, 260 b-5 th wall portion, 260 c-6 th wall portion, 260D-compression spring, 262-insertion hole, 270-O-ring, 270 a-seal side surface, 272-annular wall portion, 272a-D cutout, 274-gap, 502-front end portion, 506-rotation shaft, 506A-shaft center, 510-stand upright, 514-rod housing chamber, 516-metal cover, 518-resin cover, 520-seal member, CH-center position, DL-1 direction, DR-2 nd direction, U1-close contact area, U2-exposed area.

Claims

1. An endoscope, comprising:

an insertion portion having a front end and a base end;

an operation section provided on a base end side of the insertion section and having an operation member;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

a stand coupled to one end of the rotation shaft and guiding a treatment tool guided from the stand assembly;

a stand upright including a rod main body portion, a rod base end portion provided on one end side of the rod main body portion and connected to the other end of the rotation shaft, and a rod tip portion provided on the other end side of the rod main body portion;

a rod accommodating chamber provided in the standing table assembly, for accommodating the standing table upright rod rotatably about the rotation axis, and having an exposure window for exposing a 1 st rod side surface of the standing table upright rod on a side opposite to the rotation axis side;

an operation wire having a base end side connecting portion connected to the operation member and a tip end side connecting portion connected to the rod tip end portion of the stand upright, and causing the rotation shaft to rotate via the stand upright by an operation of the operation member to raise the stand;

A partition wall that is a part of the standing table assembly, is provided between the rod accommodation chamber and the standing table, and has a holding hole that axially supports the rotation shaft, and a 1 st accommodation chamber wall surface that forms a bottom surface of the rod accommodation chamber on the standing table side and that opens the holding hole;

an annular seal member through which the rotary shaft is inserted and which maintains air tightness between an outer peripheral surface of the rotary shaft and an inner wall surface of the holding hole;

a cover detachably covering the exposure window, wherein a gap is arranged between an inner surface of the cover on the upright post side of the stand and the 1 st post side surface;

a 1 st regulating portion protruding from at least one of a main body side surface, which is a side surface of the lever main body, and the cover inner surface, of the 1 st lever side surface, the regulating portion being interposed between the main body side surface and the cover inner surface to regulate displacement of the stand upright in a 1 st direction of the cover side in a direction parallel to an axis of the rotary shaft;

a 2 nd restricting portion provided on at least one of a 2 nd pole side surface of the rotating shaft side of the upright pole and the 1 st housing chamber wall surface, interposed between the 2 nd pole side surface and the 1 st housing chamber wall surface, and restricting displacement of the upright pole in a 2 nd direction on a side opposite to the 1 st direction; and

And a standing table accommodating chamber which is a space for accommodating the standing table, wherein a gap is formed between an inner wall surface of the standing table accommodating chamber and both side surfaces of the 1 st direction side and the 2 nd direction side of the standing table which are respectively opposed to the inner wall surface.

2. The endoscope of claim 1, wherein,

the exposure window exposes a rotation range of the standing platform upright rod rotating around the rotation shaft in the rod accommodating chamber.

3. The endoscope according to claim 1 or 2, wherein,

when the 1 st restriction portion is provided on the lid inner surface, the 1 st restriction portion has a shape along a rotation locus of at least a part of the main body portion side surface of the stand upright rotated about the rotation axis, and is interposed between the main body portion side surface and the lid inner surface at each rotation position of the stand upright.

4. The endoscope according to claim 1 or 2, wherein,

the partition wall has a 2 nd housing chamber wall surface constituting a side surface of the lever housing chamber and formed with a wire insertion hole through which the operation wire is inserted,

when the wire insertion hole is seen from the front end side of the stand assembly, the center position of the wire insertion hole is displaced toward the stand side from the rod front end portion.

5. The endoscope according to claim 1 or 2, wherein,

the seal member is disposed between an inner wall surface of the holding hole and an outer peripheral surface of the rotary shaft, and a part of the seal member is exposed from a holding hole opening on the standing table side of the holding hole.

6. The endoscope of claim 5, wherein,

an annular seal member mounting groove is formed on the outer peripheral surface of the rotary shaft so as to extend from a position closer to the upright post than the holding hole opening to a position closer to the upright post than the holding hole opening,

the sealing member includes:

a 1 st wall portion which is in close contact with a groove bottom surface of the seal member mounting groove;

a 2 nd wall portion that is in close contact with a 1 st wall surface of the seal member mounting groove on the stand side; and

And a 3 rd wall portion having a close contact area in close contact with the inner wall surface of the holding hole and an exposed area located closer to the standing table than the holding hole opening.

7. The endoscope of claim 6, wherein,

the seal member has elasticity, and is formed such that the width of the 1 st wall portion in the axial direction of the rotary shaft is longer than the width of the seal member mounting groove,

The seal member is attached to the seal member attachment groove in a state in which the 1 st wall portion is compressed in the axial direction of the rotary shaft.

8. The endoscope of claim 6, wherein,

an urging member or an elastic member that urges one of the 1 st wall portion and the 3 rd wall portion away from the other is provided between the 1 st wall portion and the 3 rd wall portion of the seal member.

9. An endoscope as claimed in any one of claims 6 to 8, wherein,

the rotary shaft is divided into a 1 st rotary shaft and a 2 nd rotary shaft by taking a 2 nd groove wall surface of the sealing component mounting groove on the upright post side of the upright post as a boundary in the axial direction of the rotary shaft,

the 1 st rotation shaft is connected with the upright post of the upright stand at one end, and is provided with a 1 st connection part and a 2 nd groove wall surface at the other end,

the 2 nd rotation shaft has one end connected to the standing table and the other end provided with a 2 nd connecting portion connected to the 1 st connecting portion, the groove bottom surface, and the 1 st groove wall surface.

10. The endoscope according to claim 1 or 2, wherein,

when the direction on the opposite side to the 1 st direction is set to the 2 nd direction, one end of the rotation shaft is located at a position further away from the 2 nd direction than the holding hole opening on the standing side of the holding hole,

The partition wall has an opposite wall surface formed with the holding hole opening and opposite to the standing table,

the seal member is disposed between the opposing wall surface and the standing table, and has an insertion hole through which the rotation shaft is inserted, a 4 th wall portion that is in close contact with the opposing wall surface, and a 5 th wall portion that is in close contact with the rotation shaft side surface of the standing table.

11. The endoscope according to claim 1 or 2, wherein,

an annular seal member mounting groove into which the seal member is fitted and an annular wall portion which forms a 1 st groove wall surface on the standing table side of the seal member mounting groove are formed on an outer peripheral surface of the rotary shaft,

the seal member mounting groove is formed on the outer peripheral surface of the rotary shaft at a position closer to the standing stand upright side than the holding hole opening of the holding hole on the standing stand side,

the annular wall portion is configured to cover a part of a seal side surface of the seal member facing the 1 st groove wall surface with the 1 st groove wall surface.

12. The endoscope of claim 11, wherein,

a cutout is provided in a part of the outer peripheral surface of the annular wall.

13. The endoscope of claim 11, wherein,

The diameter of the outer peripheral surface of the annular wall portion is smaller than the diameter of the outer peripheral surface of the seal member.

14. The endoscope according to claim 1 or 2, wherein a cover airtight holding member that holds an airtight seal between the exposure window and the cover is provided.

15. An endoscope, comprising:

an insertion portion having a front end and a base end;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

a stand coupled to one end of the rotation shaft, and guiding a treatment tool guided from the stand assembly;

An operation wire having a base end side connecting portion connected to the operation member and a tip end side connecting portion connected to the tip end portion of the pole of the stand upright, the operation wire being configured to rotate the rotation shaft via the stand upright by operation of the operation member to raise the stand;

a partition wall which is a part of the standing table assembly, is provided between the rod accommodating chamber and the standing table, and has a holding hole for supporting the rotation shaft and a 1 st accommodating chamber wall surface which forms a bottom surface of the rod accommodating chamber on the standing table side and is open to the holding hole;

a cover detachably covering the exposure window;

a 1 st restriction portion provided on a lid inner surface of the lid on the standing stand upright side, the restriction portion being interposed between a main body portion side surface, which is a side surface of the lever main body portion, of the 1 st lever side surfaces and the lid inner surface to restrict displacement of the standing stand upright in a 1 st direction of the lid side in a direction parallel to an axis of the rotary shaft;

a standing table accommodating chamber which is a space for accommodating the standing table, wherein a gap is formed between an inner wall surface of the standing table accommodating chamber and both side surfaces of the 1 st direction side and the 2 nd direction side of the standing table which are respectively opposed to the inner wall surface,

the 1 st restriction portion has a shape of a rotation locus along at least a part of the main body side surface of the stand upright rotated about the rotation axis, and is interposed between the main body side surface and the cover inner surface at each rotation position of the stand upright.

16. An endoscope, comprising:

an insertion portion having a front end and a base end;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

a cover detachably covering the exposure window;

a 1 st restriction portion provided on at least one of a body portion side surface which is a side surface of the lever body portion of the 1 st lever side surface and a cover inner surface of the cover on the stand upright side, and interposed between the body portion side surface and the cover inner surface, for restricting displacement of the stand upright in a 1 st direction of the cover side in a direction parallel to an axis of the rotation shaft;

17. An endoscope, comprising:

an insertion portion having a front end and a base end;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

a cover detachably covering the exposure window;

18. An endoscope, comprising:

an insertion portion having a front end and a base end;

a stand assembly provided on the front end side of the insertion portion;

a rotation shaft rotatably supported by the stand assembly;

a cover detachably covering the exposure window;