CN214342218U

CN214342218U - Endoscope bending part

Info

Publication number: CN214342218U
Application number: CN202021366061.7U
Authority: CN
Inventors: 孔维彪; 李承玖; 张民言; 陆文浩
Original assignee: Shanghai Eda Photoelectronic Technology Co ltd
Current assignee: Shanghai Eda Photoelectronic Technology Co ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2021-10-08
Anticipated expiration: 2030-07-13

Abstract

The utility model provides an endoscope flexion, including operating line and a plurality of snake bone joint, wherein: a plurality of snake bone joints are sequentially hinged to form a bending unit; the operation wire operates the bending unit to form bending in at least two directions; one end surface of the snake bone joint is a horizontal plane, and the other end surface is a bending surface consisting of two tangent planes; at least one part of the snake bone joints are provided with a limiting guide surface for limiting the operating wire. The utility model discloses snake bone joint's processing technology is simple, has broken through prior art snake bone joint processing technology's wall thickness size limit greatly, and intensity is high moreover, the yields is high, with low costs. Although the hinge device corresponds to the traction hole with the built-in traction wire, the hinge device is at a certain distance from the traction hole, and the traction wire is not easy to bend and fatigue damage. The utility model discloses realize the inner chamber space and utilize the maximize. The utility model discloses a two directions are crooked to the different combinations of snake bone joint, also can realize the four directions crooked, have broken through the outside diameter limit of the crooked endoscope of current two directions and the crooked endoscope of four directions greatly.

Description

Endoscope bending part

Technical Field

The utility model relates to an endoscope field specifically, relates to an endoscope flexion.

Background

The endoscope has an elongated insertion portion that is insertable into a body cavity, a bending portion is provided on a distal end side of the insertion portion, and a tip portion is provided on a distal end side of the bending portion. The head end part is at least internally provided with an imaging unit, an image transmission unit and an illumination unit. The bending portion is operated by an operation device provided in the operation portion to perform a bending operation by operating the traction wire.

Generally, the bending portion of the endoscope is composed of a plurality of snake bone joints connected with each other. In order to achieve a bending action in the bending section, the snake bone joint must have several basic features: the snake bone joint is provided with a traction hole for passing through a traction wire; adjacent snake joints are connected by an articulation which allows them to pivot relative to each other; the snake bone joint has enough lumen space to pass through wires, optical fibers, etc.

Conventionally, there is known an endoscope bending portion in which a plurality of cylindrical snake bone joints are connected to each other rotatably and coaxially. As a method for connecting the snake bone joints, for example, caulking is used. That is, a pair of tongue pieces are projected on both end surfaces of the cylindrical portion of the snake bone joint in a central axis symmetry manner, and the tongue pieces of the adjacent two snake bone joints are superposed on each other and are rotationally riveted and fixed. Refer to fig. 1. However, it is very difficult to adopt a fastening method of caulking in a small diameter endoscope. Moreover, the riveting structure not only occupies the inner cavity space of the snake bone joint, but also can locally increase the external dimension of the bending part. When the required diameter of the small-diameter endoscope is small to a certain degree, the snake bone joint cannot have enough inner cavity space for passing through electric wires, optical fibers and the like; if the outer diameter of the endoscope locally exceeds the required diameter, the insertion performance of the endoscope is impaired.

When the required diameter of the small diameter endoscope is small to some extent, such as 2.4mm, the presently known bending portion of the endoscope, and yet another configuration, referring to fig. 2 and 3, each of the serpentine joints includes an articulation means which mates with the articulation means of the adjacent serpentine joint; four traction holes are also formed in the circumferential direction of each snake bone joint so as to penetrate through traction wires; this articulated mounting and two traction holes in opposite directions are for corresponding the setting to increase articulated mounting's cooperation size, prevent faults such as dislocation, disjointing of adjacent snake bone joint, lead to the flexion to become invalid. However, the above proposal is limited by the processing technique of the snake bone joint, the wall thickness dimension of each part has processing limit, and the bendable endoscope produced by using the snake bone with the structure is known to be 2.4mm at minimum. Because the hinge device corresponds to the traction hole with the built-in traction wire, the traction wire at the hinge device is easy to bend and fatigue damage.

The utility model patent of the prior art CN 105911687a discloses an endoscope bending part, which is shown in fig. 4 and 5 and comprises a snake bone body; the snake bone body comprises a plurality of snake bone joints which are hinged in sequence; a hinged support is arranged in the inner cavity of the snake bone joint; the two side ends of the hinged support part are connected with the inner wall surface of the snake bone joint to divide the inner cavity into a first concealed space and a second concealed space; one end of the hinged support is provided with a first hinged piece, and the other end of the hinged support is provided with a second hinged piece matched with the first hinged piece; and a plurality of traction holes which axially penetrate through the hinge support are formed in the hinge support. The utility model discloses get rid of built-in connecting wire's of snake bone joint traction hole and connecting wire among the prior art, the utility model discloses well pull wire had both undertaken the original function of pull wire, still undertaken the function of connecting wire, had reduced part quantity, had increased interior concealed space. The hinge device of the scheme is arranged between two traction holes passing through the traction wire instead. In this way, both the wall thickness forming the traction bore is ensured and is used to form the hinge. However, the technical scheme has the defects of complex processing technology, high difficulty, low strength, low yield, high cost and the like of the snake bone joint, and the inner cavity space is wasted more, so that more wires, optical fibers, working channels and the like cannot be passed through to the maximum extent.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims at providing an endoscope bending part.

According to the utility model provides a pair of endoscope flexion, including operating line and a plurality of snake bone joint, wherein:

a plurality of snake bone joints are sequentially hinged to form a bending unit;

one end surface of the snake bone joint is a horizontal plane, and the other end surface is a bending surface consisting of two tangent planes;

the operation wire operates the bending unit to complete the bending action;

at least one part of the snake bone joints are provided with a limiting guide surface for limiting the operating wire.

Preferably, the intersection of the two tangent planes forms a tangent plane intersection part, and the tangent plane intersection part is arranged on two sides of the other end surface of the snake bone joint.

Preferably, the intersection part of the two tangent planes is processed by a circular arc surface.

Preferably, when two adjacent snake bone joints are connected, the intersection of the tangent planes of one snake bone joint abuts against the horizontal plane of the other snake bone joint.

Preferably, the side surface of the snake bone joint is provided with a limit guide surface, and the position of the limit guide surface can be any one of the following three modes:

mode 1: limiting guide surfaces are arranged at the positions corresponding to the intersecting parts of the tangent planes in the circumferential direction of the snake bone joints;

mode 2: limiting guide surfaces are arranged at the positions staggered with the intersection parts of the tangent planes in the circumferential direction of the snake bone joints at set angles;

mode 3: the position which is the same with the intersection part of each tangent plane in the circumferential direction of the snake bone joint and is staggered with the intersection part of each tangent plane by a set angle is also provided with a limit guide surface.

Preferably, when the fixture blocks of the adjacent snake bone joints are correspondingly arranged, the bending unit forms two-direction bending;

when the positions of the clamping blocks of the adjacent snake bone joints are arranged in a staggered mode, the bending units are bent in four directions.

Preferably, the two tangent planes of the other end face of the snake bone joint have the same included angle with the horizontal plane.

Preferably, the intersection of the tangent planes of the snake bone joint is in smooth transition connection with the two tangent planes.

Preferably, the middle area of the outer surface of the limiting guide surface forms a partial inner cylindrical surface, and the corresponding complete cylinder of the partial inner cylindrical surface is tangent to the inner wall of the snake bone joint.

Preferably, the snake bone joint is arranged in a hollow mode.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the processing technique of the snake bone joint of the utility model is simple, which greatly breaks through the wall thickness size limit of the processing technique of the snake bone joint in the prior art, and has high strength, high yield and low cost;

2. the hinge device of the utility model is corresponding to the traction hole with the built-in traction wire, and the hinge device is at a certain distance from the traction hole, so that the traction wire is not easy to bend and fatigue damage;

3. the utility model realizes the extremely simplified design of the elements forming the bending part of the endoscope, maximizes the utilization of the inner cavity space, has no waste except the minimum necessary wall thickness, and perfectly solves the contradiction of the maximization of the inner cavity of the endoscope with the minimized outer diameter through more wires, optical fibers and working channels for many years;

4. the utility model discloses a two directions are crooked in the different combinations of snake bone joint, also can realize four directions crooked, have broken through the outer diameter limit of the crooked endoscope of current two directions and four directions crooked endoscope greatly, can realize theoretical outer diameter limit with engineering.

5. The utility model discloses a flexion, as long as the combination through one kind or two kinds of snake bone joint, can realize that two directions are crooked or four directions are crooked, the processing of snake bone joint is simple, the assembly of flexion is simple, the scale production of the snake bone joint of being convenient for and flexion, the cost is less than prior art's various flexion far away, can realize theoretical cost limit with engineering, the perfect low cost and the high performance quality's of having solved medical disposable endoscope current flexion technique contradiction.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIGS. 1 to 5 are schematic structural views of a bending portion of a conventional endoscope;

FIG. 6 is a schematic structural view of an embodiment of a bending portion of an endoscope according to the present invention;

FIGS. 7(a) and 7(b) are schematic views showing the structure of a single snake bone joint of the bending portion of the endoscope of the present invention;

fig. 8 is a front view schematically showing a single snake bone joint of the bending portion of the endoscope of the present invention.

The figures show that:

operating line 1

Snake bone joint 2

Section 3 of dried noodles

Tangent plane connecting part 4

Limiting guide surface 5

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.

The requirement of the ultra-fine diameter bendable endoscope is that the outer diameter is minimized so as to easily enter the urethra, biliary tract, lacrimal passage, cardiac blood vessel and the like of a human body, and an ultra-small inner cavity and the like of the industries such as aerospace military industry and the like. But the lumen is maximized to allow for the passage of relatively many wires, optical fibers, working channels, etc. The more the wires are, the higher the pixel number of the camera can be, and the clearer the image is; the more optical fibers, the higher the illumination intensity; the larger the working channel is, the more functional the surgical instruments can be used, thus being beneficial to minimally invasive surgery and the like. To the above problem, the utility model discloses creatively proposes: each snake bone joint comprises a hinge device which is matched with the hinge device of the adjacent snake bone joint; at least two traction holes are formed in the circumferential direction of each snake bone joint so as to penetrate through traction wires; the hinge device and the two opposite traction holes are correspondingly arranged or are arranged in a 90-degree staggered manner; the hinge device is at a certain distance from the traction hole; the traction hole is tangent to the inner hole of the snake bone joint, the gap between the traction hole and the traction line is not larger than the wall thickness of the snake bone joint, and the failure of the bending part caused by the dislocation, disjointing and other faults of adjacent snake bone joints is prevented.

Specifically, according to the specific embodiment provided by the present invention, as shown in fig. 6 to 8, the present invention comprises an operation line 1 and a plurality of snake bone joints 2, wherein: a plurality of snake bone joints 2 are sequentially hinged to form a bending unit; the operation wire 1 operates the bending unit to form a bend in two directions. One end face of the snake bone joint 2 is provided with a horizontal plane, and two sides of the other end face of the snake bone joint 2 are provided with tangent plane connecting parts 4.

The snake bone joint 2 is provided with a limit guide surface 5 for limiting an operation line, the snake bone joint 2 has two structures in the embodiment, the limit guide surface 5 of the first snake bone joint 2 is arranged at a position corresponding to the intersection part of each tangent plane in the circumferential direction of the snake bone joint, and the limit guide surface 6 of the second snake bone joint 2 is arranged at a position which forms 90 degrees with the intersection part of each tangent plane in the circumferential direction of the snake bone joint. When concrete connection, the snake bone joints 2 of two kinds of structures are in staggered connection, and the tangent plane connecting parts 4 of the snake bone joints 2 of two kinds of structures are ensured to be in corresponding positions, the control line sequentially passes through the inner wall of the first kind of snake bone joint 2, and the limit guide surface 5 of the second kind of snake bone joint 2 realizes the control of the bent angle in two directions.

The utility model discloses still provide another embodiment, including operation line 1 and a plurality of snake bone joint 2, wherein: a plurality of snake bone joints 2 are sequentially hinged to form a bending unit; the operation wire 1 operates the bending unit to form four-directional bending. One end face of the snake bone joint 2 is provided with a horizontal plane, and two sides of the other end face of the snake bone joint 2 are provided with tangent plane connecting parts 4.

The snake bone joint 2 is provided with a limit guide surface 5 for limiting the operation line, the snake bone joint 2 with only one structure is arranged in the embodiment, and the limit guide surface 6 of the snake bone joint 2 is arranged at a position which forms an angle of 90 degrees with each tangent plane in the circumferential direction of the snake bone joint. During specific connection, the adjacent snake bone joints 2 are connected in a staggered mode, the tangent plane connecting portions 4 of the two adjacent snake bone joints 2 are guaranteed to be in staggered positions, and the control lines sequentially pass through the inner walls of the snake bone joints 2 in a staggered mode and the limiting guide surfaces 5 to achieve bend angle control in four directions.

The utility model discloses a two directions are crooked to the different combinations of snake bone joint, also can realize four directions crooked, and the maximize is utilized to the inner chamber space, except the necessary wall thickness of minimum degree, does not have any waste, can be through more electric wires, optic fibre, working channel, has broken through the outer diameter limit of current two directions crooked endoscope and four directions crooked endoscope moreover greatly.

The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. An endoscope bending section comprising an operation wire and a plurality of snake bone joints, wherein:

the operation wire operates the bending unit to complete the bending action;

2. The bending portion of an endoscope according to claim 1, wherein the intersection of the two cut surfaces forms a cut surface intersection portion provided on both sides of the other end surface of the snake bone joint.

3. The bending portion of an endoscope according to claim 2, wherein the intersection of the two cutting planes is processed into a circular arc.

4. The endoscope bending section according to claim 2, wherein when two adjacent serpentine joints are connected, the intersection of the cutting surfaces of one serpentine joint abuts on the horizontal surface of the other serpentine joint.

5. The bending portion of an endoscope according to claim 2, wherein a side surface of the snake bone joint is provided with a position-limiting guide surface, and the position of the position-limiting guide surface can be any one of the following three types:

6. The endoscopic flexure of claim 5,

when the clamping blocks of the adjacent snake bone joints are correspondingly arranged, the bending units form two-direction bending;

7. The bending section of an endoscope according to claim 2, wherein the angle of the two cut surfaces of the other end surface of the snake bone joint with respect to the horizontal plane is the same.

8. The endoscopic bend of claim 3, characterized in that the intersection of the cut surfaces of the snake bone joint is in smooth transition with both cut surfaces.

9. The endoscopic flexure of claim 1, wherein the mid-region of the outer surface of the stop guide surface forms a partial cylindrical surface with a corresponding full cylinder tangent to the inner wall of the snake bone joint.

10. The endoscope bending section of claim 1, wherein the snake bone joint is hollow.