CN219699885U - Endoscope bending state retaining mechanism and endoscope - Google Patents

Abstract

An endoscope bending state holding mechanism and an endoscope, the endoscope bending state holding mechanism comprising: the rotary part, the operating part, the traction wire and the damping part are rotatably arranged in the shell; the operating piece is positioned outside the shell and can extend to the inside of the shell to be fixedly connected with the rotating piece; the traction wire is wound on the rotating piece and is fixedly connected with the rotating piece and the bending section; the damping piece is arranged between the rotating piece and the shell and is simultaneously abutted against the rotating piece and the shell; the damping piece is used for preventing the rotation of the rotating piece relative to the shell when the rotating piece rotates to any position. According to the endoscope bending state retaining mechanism, friction force can be generated between the rotating piece and the shell through the damping piece arranged between the rotating piece and the shell, when the rotating piece rotates to any position, static friction force is generated between the rotating piece and the shell through the damping piece, the pulling force of the bending section on the pulling wire is smaller than the static friction force, the rotating piece cannot rotate relative to the shell, and the bending section can be kept in the bending state.

Description

Endoscope bending state retaining mechanism and endoscope

Technical Field

The utility model relates to the technical field of medical endoscopes, in particular to an endoscope bending state retaining mechanism and an endoscope.

Background

With rapid development of science and technology and medical technology, endoscope minimally invasive or noninvasive medical examination and treatment have been widely popularized. Especially a medical soft endoscope, can enter the human body through a natural duct of the human body in the examination or treatment process, and has almost no damage to the patient. The doctor can utilize the characteristic that the endoscope traction wire pulls the insertion part to bend the front end of the insertion part to perform omnibearing examination on pathological tissues so as to eliminate observation blind areas. When it is necessary to observe or perform an operation on a diseased tissue for a long period of time, it is necessary to maintain the distal end of the insertion portion in a bent state for a long period of time.

The existing medical flexible endoscope generally comprises an operation part and an insertion part, wherein the operation part is mainly a control mechanism of the endoscope, the front end of the insertion part can be controlled to bend, the operation part controls the bending section of the insertion part to bend by operating a traction steel wire, and a doctor can observe the surrounding tissues of a part to be inspected conveniently.

At present, the traditional endoscope operation part does not have a self-locking function, and needs medical growth time to control the operation part, so that the front end bending part is kept in a bending state, thereby not only causing fatigue of doctors, but also easily losing an observation target.

Disclosure of Invention

The utility model provides an endoscope bending state holding mechanism and an endoscope, which are used for reducing the fatigue degree of medical staff and improving the operation efficiency.

According to a first aspect of the present utility model, there is provided an endoscope bending state holding mechanism provided to an endoscope operation section for adjusting and holding a bending state of a bending section of an endoscope, the endoscope bending state holding mechanism including:

a rotating member rotatably mounted inside a housing of the operation portion;

the operating piece is positioned outside the shell of the operating part and can extend to the inside of the shell of the operating part to be fixedly connected with the rotating piece;

the traction wire is wound on the rotating piece and is fixedly connected with the rotating piece and the bending section;

the damping piece is arranged between the rotating piece and the shell of the operating part and is simultaneously abutted against the rotating piece and the shell of the operating part; the damping member is configured to prevent the rotation of the rotating member relative to the housing of the operating portion when the rotating member is rotated to an arbitrary position.

In one embodiment, the method further comprises: the limiting piece is arranged between the rotating piece and the shell of the operating part and used for limiting the rotating piece to rotate around the rotating axis of the rotating piece by a first preset angle along the clockwise direction, or limiting the rotating piece to rotate around the rotating axis of the rotating piece by a second preset angle along the anticlockwise direction.

In one embodiment, the rotating member has a rotating shaft portion and a wheel body, the damping member and the limiting member are both disposed between the rotating shaft portion and the housing of the operating portion, and the operating member is fixedly connected with the rotating shaft portion.

In one embodiment, the shaft body of the rotating shaft part is provided with a containing groove, and the damping piece is contained in the containing groove.

In one embodiment, the accommodating groove surrounds the shaft body of the rotating shaft part to form an annular accommodating groove, the damping piece is an annular damping piece, and the annular damping piece is sleeved in the annular accommodating groove.

In one embodiment, the operating member has a connecting portion and an operating handle, the operating handle is located outside the housing of the operating portion, and the connecting portion extends into the interior of the housing of the operating portion and is coaxially connected with the rotating shaft.

In one embodiment, the surface of the operating handle is provided with an anti-slip portion.

In an embodiment, the limiting piece is a limiting protrusion, the limiting protrusion is disposed in the casing of the operating portion, a first limiting portion and a second limiting portion are further disposed on the peripheral surface of the rotating piece surrounding the rotation axis of the rotating piece, the limiting protrusion contacts the first limiting portion to block the rotating piece from rotating by a first preset angle, and the limiting protrusion contacts the second limiting portion to block the rotating piece from rotating by a second preset angle.

In one embodiment, the rotating member is provided with a notch around the circumferential surface of the rotation axis of the rotating member, a first side wall and a second side wall are formed on the circumferential surface of the rotating member, the first side wall is formed as the first limiting portion, and the second side wall is formed as the second limiting portion.

According to a second aspect of the present utility model, there is provided an endoscope comprising:

an operation unit including: a housing and the endoscope bending state holding mechanism;

an insertion portion comprising: the device comprises an insertion tube, a bending section and a front end part, wherein one end of the bending section is connected with one end of the insertion tube, the other end of the bending section is connected with the front end part, and the other end of the insertion tube is connected with the shell.

According to the endoscope bending state holding mechanism and the endoscope of the above embodiments, the endoscope bending state holding mechanism is provided to the endoscope operation section for adjusting and holding a bending state of a bending section of the endoscope, the endoscope bending state holding mechanism includes: the device comprises a rotating piece, an operating piece, a traction wire and a damping piece, wherein the rotating piece is rotatably arranged in a shell of the operating part; the operating piece is positioned outside the shell of the operating part and can extend to the inside of the shell of the operating part to be fixedly connected with the rotating piece; the traction wire is wound on the rotating piece and is fixedly connected with the rotating piece and the bending section; the damping piece is arranged between the rotating piece and the shell of the operating part and is simultaneously abutted against the rotating piece and the shell of the operating part; the damping member is configured to prevent the rotation of the rotating member relative to the housing of the operating portion when the rotating member is rotated to an arbitrary position. The damping piece that sets up between rotating piece and casing can make to produce frictional force between rotating piece and the casing, and at rotating piece pivoted in-process, damping piece makes to produce dynamic friction between rotating piece and the casing, and in-process, rotating piece can overcome this dynamic friction to keep rotating. When the rotating piece rotates to any position, the damping piece enables static friction force to be generated between the rotating piece and the shell, the bending section is bent, tension is generated on the traction wire by the bending section, the tension is smaller than the static friction force, the rotating piece cannot rotate relative to the shell, and then the bending section can be kept in the bending state, so that the fatigue of medical staff can be effectively reduced, and the operation efficiency is improved.

Drawings

FIG. 1 is a schematic view of an endoscope provided by the present utility model;

FIG. 2 is a schematic view of an insertion portion of an endoscope according to the present utility model;

FIG. 3 is a schematic view of the interior of an endoscope provided by the present utility model;

FIG. 4 is a cross-sectional view of the endoscope bending state holding mechanism provided by the present utility model;

fig. 5 is a schematic view showing the structure of a turning member in the bending state holding mechanism for an endoscope according to the present utility model.

Reference numerals illustrate:

an operation section 100, a housing 101, a rotation shaft hole 1010, an insertion section 200, an insertion tube 201, a bent section 202, a tip section 203, an image pickup unit 204, a connection cable 300, and a connection plug 301;

the rotary part 10, the rotary axis L, the rotary shaft part 11, the accommodating groove 110, the notch 111, the first side wall 112, the second side wall 113, the wheel body 12 and the wire slot 13;

an operation member 20, a connection portion 21, an operation handle 22, and an anti-slip portion 220;

a traction wire 30;

a damper 40;

and a stopper 50.

Detailed Description

The utility model will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present utility model. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present utility model have not been shown or described in the specification in order to avoid obscuring the core portions of the present utility model, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments, and the operational steps involved in the embodiments may be sequentially exchanged or adjusted in a manner apparent to those skilled in the art. Accordingly, the description and drawings are merely for clarity of describing certain embodiments and are not necessarily intended to imply a required composition and/or order.

The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.

The utility model provides an endoscope bending state holding mechanism and an endoscope, wherein the endoscope can be a medical endoscope or an industrial endoscope, more particularly, the endoscope is a medical flexible endoscope, the shooting angle of a front-end image acquisition unit can be adjusted and held according to the examination requirement, and the endoscope is convenient for medical staff to comprehensively observe a part to be examined, and meanwhile, can reduce the fatigue of the medical staff and improve the operation efficiency.

Referring to fig. 1 and 2, fig. 1 is a perspective view showing the medical flexible endoscope, and fig. 2 is a schematic view showing the structure of an insertion portion in the medical flexible endoscope. The endoscope provided by the utility model comprises: the operation unit 100, the insertion unit 200, and the connection cable 300, the operation unit 100 includes: the housing 101 and the endoscope bending state holding mechanism provided by the present utility model, the insertion section 200 includes: the insertion tube 201, the bending section 202 and the tip 203, one end of the bending section 202 is connected with one end of the insertion tube 201, the tip 203 is mounted at the other end of the bending section 202, the image capturing unit 204 is provided at the tip 203, the connection cable 300 is mounted to the operation section 100, and the connection plug 301 is provided at one end of the connection cable 300 away from the operation section 100, the connection plug 301 can be externally connected with a display host, so that the image capturing unit 204 can be connected with the external display host through the connection cable 300. The insertion part 200 may be inserted into a human body through a natural duct of the human body such as an oral cavity, a nasal cavity, an external auditory canal, etc., and an image signal of a portion to be inspected inside the human body may be obtained through the image acquisition unit 204, and the connection cable 300 connects the image acquisition unit 204 with an external display host, so that the image signal obtained by the image acquisition unit 204 may be converted into an image or video information for display, so that the medical staff can observe conveniently.

In this embodiment, the bending section 202 can be controlled to bend by the operation portion 100 to drive the image acquisition unit 204 disposed at the distal end portion 203 to change the orientation angle, so that image signals with different angles can be obtained, thereby facilitating the omnidirectional inspection of the portion to be inspected. Through the setting of endoscope bending state retaining mechanism, can keep the angle that image acquisition unit 204 was oriented for a long time to make bending section 202 possess the auto-lock function, conveniently wait to examine long-time observation or the implementation operation of position, and can reduce medical personnel fatigue, improve operating efficiency.

The endoscope bending state holding mechanism provided by the utility model is arranged on the endoscope operation part 100 and is used for adjusting and holding the bending state of the bending section 202 of the endoscope. Referring to fig. 3 and 4, the endoscope bending state holding mechanism includes: the rotation member 10, the operation member 20, the traction wire 30, and the damping member 40.

The rotary member 10 is rotatably mounted inside the housing 101, and as shown in fig. 5, the rotary member 10 has a rotation axis L about which the rotary member 10 can rotate in a clockwise direction or a counterclockwise direction. The operating member 20 is located outside the housing 101 and extends into the housing 101 to be fixedly coupled to the rotary member 10. The medical staff can rotate the rotating member 10 synchronously by rotating the operating member 20 to provide manual driving force for the rotation of the rotating member 10.

The traction wire 30 is wound around the rotating member 10 and is fixedly connected with the rotating member 10 and the bending section 202.

In this embodiment, a traction wire 30 is provided, the traction wire 30 is wound on the rotating member 10 and is fixedly connected to a portion of the rotating member 10 in contact with the rotating member, two ends of the traction wire 30 are respectively connected to two sides of the bending section 202, and the bending section 202 can be bent under the pulling of the traction wire 30.

Specifically, in the process of rotating the operation member 20 to drive the rotation member 10 to rotate synchronously, the traction wire 30 located at one side of the bending section 202 is lengthened, and the traction wire 30 located at the other side of the bending section 202 is shortened, so that the traction wires 30 at two sides of the bending section 202 are changed, the bending section 202 bends towards the side where the traction wire 30 is shortened, so that bending control of the bending section 202 is realized, and further, control of the orientation angle of the image acquisition unit 204 mounted on the front end 203 of the bending section 202 is realized, so that the part to be inspected is observed in all directions.

In one embodiment, the bending section 202 is composed of a plurality of sequentially hinged snake bone structures, and connects two ends of the traction wire 30 to two sides of the snake bone structure far from the operation part 10, so that the plurality of snake bone structures are bent when the lengths of the traction wires 30 at two sides of the snake bone structure are changed.

The damper 40 is provided between the rotor 10 and the housing 101, and abuts against both the rotor 10 and the housing 101. The damper 40 is used to prevent the rotation of the rotary member 10 relative to the housing 101 when the rotary member 10 is rotated to an arbitrary position.

In the present embodiment, the damping member 40 provided between the rotary member 10 and the housing 101 can cause friction between the rotary member 10 and the housing 101. Specifically, the damping member 40 generates a kinetic friction force between the rotary member 10 and the housing 101 during rotation of the rotary member 10 and drives the one-side traction wire 30 to be longer and the other-side traction wire 30 to be shorter, and the rotary member 10 can overcome the kinetic friction force to maintain rotation during the process. When the rotating member 10 rotates to any position, the damping member 40 generates a static friction force between the rotating member 10 and the housing 101, and at this time, the traction wire 30 with a shortened length pulls the bending section 30 to bend, and the bending section 30 generates a pulling force on the traction wire 30 with a shortened length, and the pulling force is smaller than the static friction force, so that the rotating member 10 cannot rotate relative to the housing 101, and the bending section 202 can be kept in the bending state.

Of course, when the magnitude of the bending angle of the bending section 202 needs to be adjusted, the adjustment is indirectly performed by rotating the rotational angle of the operation member 20. It will be appreciated that the greater the angle at which the rotatable member 10 rotates, the greater the angle at which the curved segment 202 bends, and the lesser the angle at which the rotatable member 10 rotates, the lesser the angle at which the curved segment 202 bends, in a proportional relationship.

It will be appreciated that the damping member 40 simultaneously abuts the rotary member 10 and the housing 101, such that the damping member 40 maintains a sufficient contact area with the rotary member 10 and the housing 101, thereby providing a sufficient frictional force.

The damping member 40 should have a certain elasticity, and during the rotation of the rotating member 10, the damping member 40 can deform to facilitate the rotation of the rotating member 10, and at the same time, when the rotating member 10 stops rotating, the damping member 40 can be restored to the original shape, so that a proper static friction force exists between the rotating member 10 and the housing 101 to prevent the rotation of the rotating member 10 relative to the housing 101.

In general, the damping member 40 may be made of a high polymer elastomer material, such as polyurethane, silicone rubber, and fluororubber, so that the damping member 40 can enable a proper static friction force between the rotating member 10 and the housing 101, and when the rotating member 10 stops rotating, the rotating member can be locked to rotate to any position under the action of the damping member 40, so that the bending section 202 is kept in a bending state.

As shown in fig. 4, the rotating member 10 is provided with a wire groove 13 around the circumferential surface of the rotation axis L, one or two traction wires 30 are provided, if one traction wire 30 is provided, the traction wire 30 is wound in the wire groove 13 of the rotating member 10, and two ends of the traction wire 30 are respectively connected to two sides of the distal end of the bending section 202. As the rotary member 10 rotates, the length of the traction wires 30 on either side of the bending section 202 changes, thereby bending the bending section 202. If two traction wires 30 are adopted, one ends of the two traction wires 30 are wound around and fixed to the wire grooves 13 of the rotating member 10, and the other ends of the two traction wires 30 are respectively connected to two sides of the distal end of the bending section 202, so that the lengths of the traction wires 30 positioned at two sides of the rotating member 10 are changed during the rotation of the rotating member 10. Thereby bending the curved section 202.

Because the bending section 202 is composed of a plurality of snake bone structures which are sequentially hinged, in order to avoid damage caused by excessive bending of the bending section 202, bending of the bending section 202 needs to be limited. As shown in fig. 4, the endoscope bending state holding mechanism provided by the present embodiment further includes: the limiting member 50 is disposed between the rotating member 10 and the housing 101, and the limiting member 50 is used for limiting the rotating member 10 to rotate around the rotation axis L thereof by a first preset angle in a clockwise direction or limiting the rotating member 10 to rotate around the rotation axis L thereof by a second preset angle in a counterclockwise direction.

In the present embodiment, the rotary member 10 has a rotary shaft portion 11 and a wheel body 12, specifically, the rotary shaft portion 11 and the wheel body 12 are coaxially arranged to form the rotary member 10 as a unitary structure, the radial size of the rotary shaft portion 11 is smaller than the size of the wheel body 12, and the wire grooves 13 are provided on the peripheral surface of the wheel body 12. The damper 40 and the stopper 50 are disposed between the spindle 11 and the housing 101, and the operating member 20 is fixedly connected to the spindle 11.

In one embodiment, the operating member 20 has a connecting portion 21 and an operating handle 22, the operating handle 22 is located outside the housing 101, and the connecting portion 21 extends into the interior of the housing 101 and is coaxially connected with the rotating shaft 11. By turning the operation knob 22 to the left, the rotation shaft 11 is turned clockwise around the rotation axis L by the connection portion 21, and by turning the operation knob 22 to the right, the rotation shaft 11 is turned counterclockwise around the rotation axis L by the connection portion 21, as shown in fig. 4.

To facilitate the operation of the operation member 20, an anti-slip portion 220 is further provided on the surface of the operation handle 22 to increase the friction between the hands of the medical staff and the operation handle 22. The anti-slip portion 220 may be a groove or a bump provided on the surface of the operating handle 22, or may be an anti-slip pad provided on the surface of the operating handle 22.

In the present utility model, a rotation shaft hole 1010 is provided in the inside of the housing 101, and the rotation shaft portion 11 is accommodated in the rotation shaft hole 1010 and rotatable in a clockwise direction or a counterclockwise direction about the rotation axis L within the rotation shaft hole 1010. Of course, the damping member 40 is located between the shaft portion 11 and the wall of the shaft hole 1010, and the limiting member 50 is located in the shaft hole 1010.

Referring to fig. 4, the shaft of the rotating shaft 11 is provided with a receiving groove 110, and the damping member 40 is received in the receiving groove 110 to prevent the damping member 40 from falling off during the rotation of the rotating member 10.

In this embodiment, the accommodating groove 110 is disposed around the shaft body of the rotating shaft 11 to form an annular accommodating groove, and the damping member 40 is an annular damping member, and the annular damping member is sleeved in the annular accommodating groove.

The annular damping member can be respectively in contact with the accommodating groove 110 and the rotating shaft hole 1010, so that the circumferential direction of the rotating member 10 is subjected to uniform dynamic friction force and static friction force, and the smoothness of rotation is ensured. The annular damping member can also increase the contact area with the receiving groove 110 and the rotation shaft hole 1010, and thus can increase the magnitude of dynamic friction and static friction.

The cross-sectional shape of the annular damper in the axial direction may be one of a circle, a rectangle, and a polygon, thereby further increasing the contact area with the receiving groove 110 and the rotating shaft hole 1010.

As shown in fig. 4 and 5, the limiting member 50 is disposed on a limiting protrusion, which is disposed inside the housing 101, more specifically, inside the shaft hole 1010. The peripheral surface of the rotating member 10 surrounding the rotation axis thereof is further provided with a first limiting portion and a second limiting portion, wherein the limiting protrusion contacts the first limiting portion to prevent the rotating member 10 from rotating by a first preset angle, and the limiting protrusion contacts the second limiting portion to prevent the rotating member 10 from rotating by a second preset angle.

Specifically, if the rotating member 10 rotates clockwise around the rotation axis L such that the limiting protrusion contacts the first limiting portion, the rotating member 10 is prevented from rotating from the initial position by a first preset angle, and if the rotating member 10 rotates counterclockwise around the rotation axis L such that the limiting protrusion contacts the second limiting portion, the rotating member 10 is prevented from rotating from the first preset angle and then from rotating by a second preset angle. It can be understood that if the limit protrusion contacts the second limit portion or the first limit portion at the initial position, the first preset angle is the same as the second preset angle.

In the present embodiment, the rotating member 10 is provided with a notch 111 around the peripheral surface of the rotation axis L thereof, specifically, the notch 111 is provided in the rotation shaft portion 11, the notch 111 is formed with a first side wall 112 and a second side wall 113 around the rotation axis L of the rotating member 10 on the peripheral surface of the rotating member 11, the first side wall 112 is formed as a first limit portion, and the second side wall 113 is formed as a second limit portion.

It can be appreciated that, after the shaft portion 11 of the rotating member 10 is mounted in the shaft hole 1010, the limiting protrusion is located in the notch 111, and along with the rotation of the rotating member 10 around the rotation axis L in the clockwise direction or the counterclockwise direction, the limiting protrusion can release the first side wall 112 or the second side wall 113, so as to limit the rotation angle of the rotating member 10, thereby limiting the bending angle of the bending section 202 and avoiding the bending section 202 from being damaged by excessive bending.

In summary, according to the endoscope bending state holding mechanism and the endoscope provided by the present embodiment, the damping member disposed between the rotating member and the housing can generate a friction force between the rotating member and the housing, and in the rotating process of the rotating member, the damping member can generate a kinetic friction force between the rotating member and the housing, and in the rotating process, the rotating member can overcome the kinetic friction force to keep rotating. When the rotating piece rotates to any position, the damping piece enables static friction force to be generated between the rotating piece and the shell, the bending section is bent, tension is generated on the traction wire by the bending section, the tension is smaller than the static friction force, the rotating piece cannot rotate relative to the shell, and then the bending section can be kept in the bending state, so that the fatigue of medical staff can be effectively reduced, and the operation efficiency is improved.

The foregoing description of the utility model has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the utility model pertains, based on the idea of the utility model.

Claims (10)

1. An endoscope bending state holding mechanism provided in an endoscope operation section for adjusting and holding a bending state of a bending section of an endoscope, the endoscope bending state holding mechanism comprising:

a rotating member rotatably mounted inside a housing of the operation portion;

the operating piece is positioned outside the shell of the operating part and can extend to the inside of the shell of the operating part to be fixedly connected with the rotating piece;

the traction wire is wound on the rotating piece and is fixedly connected with the rotating piece and the bending section;

the damping piece is arranged between the rotating piece and the shell of the operating part and is simultaneously abutted against the rotating piece and the shell of the operating part; the damping member is configured to prevent the rotation of the rotating member relative to the housing of the operating portion when the rotating member is rotated to an arbitrary position.

2. The endoscope bending state retention mechanism of claim 1, further comprising: the limiting piece is arranged between the rotating piece and the shell of the operating part and used for limiting the rotating piece to rotate around the rotating axis of the rotating piece by a first preset angle along the clockwise direction, or limiting the rotating piece to rotate around the rotating axis of the rotating piece by a second preset angle along the anticlockwise direction.

3. The endoscope bending state holding mechanism according to claim 2, wherein the rotating member has a rotating shaft portion and a wheel body, the damper member and the stopper member are both provided between the rotating shaft portion and a housing of the operating portion, and the operating member is fixedly connected to the rotating shaft portion.

4. The endoscope bending state holding mechanism according to claim 3, wherein a housing groove is provided on the shaft body of the rotation shaft portion, and the damper is housed in the housing groove.

5. The endoscope bending state holding mechanism of claim 4, wherein the accommodation groove is provided around the shaft body of the rotating shaft portion to form an annular accommodation groove, the damping member is an annular damping member, and the annular damping member is sleeved in the annular accommodation groove.

6. The endoscope bending state holding mechanism according to claim 3, wherein the operation member has a connection portion and an operation handle, the operation handle being located outside a housing of the operation portion, the connection portion extending into an inside of the housing of the operation portion and being coaxially connected to the rotation shaft.

7. The endoscope curved state holding mechanism according to claim 6, wherein a surface of the operating handle is provided with an anti-slip portion.

8. The endoscope bending state holding mechanism according to claim 3, wherein the stopper is a stopper protrusion provided inside the housing of the operation portion, the rotation member is further provided with a first stopper portion and a second stopper portion around a peripheral surface of a rotation axis thereof, the stopper protrusion contacts the first stopper portion to block the rotation member from rotating by a first preset angle, and the stopper protrusion contacts the second stopper portion to block the rotation member from rotating by a second preset angle.

9. The endoscope curved state holding mechanism according to claim 8, wherein the rotary member is provided with a notch around a peripheral surface of a rotation axis thereof, the notch being formed with a first side wall and a second side wall around the rotation axis of the rotary member, the first side wall being formed as the first stopper portion, and the second side wall being formed as the second stopper portion.

10. An endoscope, comprising:

an operation unit including: a housing and an endoscope bending state holding mechanism according to any one of claims 1 to 9;

an insertion portion comprising: the device comprises an insertion tube, a bending section and a front end part, wherein one end of the bending section is connected with one end of the insertion tube, the other end of the bending section is connected with the front end part, and the other end of the insertion tube is connected with the shell.