CN111700578A - Endoscope bending part - Google Patents

Abstract

The invention provides an endoscope bending part, which comprises an operation wire and a plurality of snake bone joints, 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; at least one part of the snake bone joints are provided with a limiting guide surface for limiting the operating wire. The snake bone joint processing technology is simple, greatly breaks through the wall thickness size limit of the snake bone joint processing technology in the prior art, and is high in strength, high in yield and low in cost. 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 invention realizes the maximization of the utilization of the inner cavity space. The invention can realize two-direction bending and four-direction bending through different combinations of the snake bone joints, and greatly breaks through the outer diameter limit of the existing two-direction bending endoscope and four-direction bending endoscope.

Description

Endoscope bending part

technical field

The present invention relates to the field of endoscopes, and in particular, to a curved part of an endoscope.

Background technique

The endoscope has an elongated insertion portion that can be inserted into a body cavity, a curved portion is provided on the distal end side of the insertion portion, and a tip portion is provided on the distal side of the curved portion. The head end is provided with at least an imaging unit, an image transmission unit and an illumination unit. The bending portion performs a bending operation by operating the pulling wire by an operating device provided in the operating portion.

Generally, the curved part of the endoscope is composed of a plurality of serpentine joints connected to each other. In order to realize the bending action of the bending part, the snake bone joint must have the following basic characteristics: a traction hole is provided on the snake bone joint to pass through the traction wire; the adjacent snake bone joints are connected by a hinge device, and the hinge device Allow them to pivot relative to each other; snakebone joints have enough lumen space to pass wires, fibers, etc.

In a conventionally known bending portion of an endoscope, a plurality of cylindrical serpentine joints are rotatably connected to each other coaxially. As a method of connecting the snake-bone joint, for example, riveting is used. That is, a pair of tongue pieces protrudes symmetrically with respect to the central axis on the two end surfaces of the cylindrical portion of the snake joint, and the tongue pieces of the two adjacent snake joints overlap each other and are rotatably riveted and fixed. Refer to Figure 1. However, in a small diameter endoscope, it is very difficult to use a connection method of caulking. Moreover, the riveted structure will not only occupy the inner cavity space of the snake-bone joint, but also locally increase the external dimension of the curved portion. When the required diameter of the small-diameter endoscope is small to a certain extent, the snake joint cannot have enough lumen space to pass wires, optical fibers, etc.; if the outer diameter of the endoscope partially exceeds the required diameter, it will affect the internal Insertability of speculum.

When the required diameter of the small diameter endoscope is small to a certain extent, such as 2.4mm, the currently known curved part of the endoscope has another structure. Referring to Figures 2 and 3, each snake bone joint includes a hinge device, The hinge device is matched with the hinge device of the adjacent serpentine joint; the circumferential direction of each serpentine joint is also provided with four traction holes to pass through the traction wire; the hinge device and the two opposite traction holes are arranged correspondingly, In order to increase the matching size of the hinge device, it can prevent the failure of the adjacent snake bone joints such as dislocation and disjoint, resulting in the failure of the bending part. However, the above solution is limited by the processing technology of the snake-bone joint, and the wall thickness of each part has a processing limit. The bendable angle endoscope produced by using the snake-bone with this structure is known to be at least 2.4mm. Since the hinge device corresponds to the traction hole of the built-in traction wire, the traction wire at the hinge device is prone to bending and fatigue damage.

The existing document is the invention patent of CN 105911687A, which discloses a bending part of an endoscope, referring to FIGS. 4 and 5 , including a snake bone body; wherein, the snake bone body includes a plurality of snake bone joints hinged in sequence; the snake bone body The inner cavity of the bone joint is provided with a hinged support; both sides of the hinged support are connected to the inner wall surface of the snake-bone joint, and the inner cavity is divided into a first storage space and a second storage space; One end of the hinge support is provided with a first hinge, and the other end is provided with a second hinge matched with the first hinge; the hinge support is provided with a plurality of traction holes that penetrate axially. The present invention removes the traction hole and the connecting wire of the built-in connecting wire of the snake bone joint in the prior art. In the present invention, the pulling wire not only undertakes the original function of the pulling wire, but also bears the function of the connecting wire, thereby reducing the number of components and increasing the internal hide space. The hinge device of the above solution is changed to be arranged in the middle of the two pulling holes passing through the pulling wire. In this way, the wall thickness for forming the traction hole is ensured, and the wall thickness is fully utilized to set the wall thickness as a hinge device. However, the above solution has the disadvantages of complex processing technology of snake bone joint, high difficulty, low strength, low yield, high cost, and a lot of waste of inner cavity space, which cannot be maximized to pass more wires, optical fibers, working channels, etc., Only two-way bending can be achieved.

SUMMARY OF THE INVENTION

Aiming at the defects in the prior art, the purpose of the present invention is to provide a curved part of an endoscope.

An endoscope bending part provided according to the present invention includes an operation wire and a plurality of serpentine joints, wherein:

A plurality of snake bone joints are hinged in turn to form a bending unit;

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

At least a part of the serpentine joints are provided with limit guide surfaces for limiting the operating wire.

Preferably, both sides of one end face of the snake-bone joint are provided with first notches, and a corresponding position of the other end face of the snake-bone joint is provided with a block matching the first notch. It is inserted into the first notch of the adjacent snake bone joint and can be hinged and rotated in the first notch.

Preferably, at least one limit guide surface is provided on the side surface of the snake bone joint, the limit guide surface is recessed from the side surface of the snake bone joint to the axis direction of the snake bone joint, and the limit guide surface is provided along the snake bone joint. Between the two first notches in the circumferential direction of the bone joint.

Preferably, a connecting line is also included, which is fixedly connected with the inner walls corresponding to the clamping blocks of the plurality of snake-bone joints.

Preferably, the other two sides of one end face of the snake-bone joint are provided with a second notch that is the same as the first notch.

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

Method 1: The position between each first gap and its corresponding block is provided with a limited guide surface;

Method 2: In the circumferential direction of the snake-bone joint and each first gap at a position that is misaligned by a set angle, a limited guide surface is provided;

Mode 3: The position between each first notch and its corresponding block, and the position in the circumferential direction of the snake bone joint and each first notch at a predetermined angle misalignment, and a limited guide surface is provided at the same time.

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

When the positions of the clamping blocks of the adjacent snake-bone joints are dislocated, the bending unit forms bending in four directions.

Preferably, the other end surface of the snake-bone joint and the two side surfaces of the clamping block form a set angle with each other.

Preferably, the middle region of the outer surface of the limiting guide surface forms a part of the inner cylindrical surface, and the complete cylinder corresponding to the part of the inner cylindrical surface is tangent to the inner wall of the serpentine joint.

Preferably, the snake-bone joint is hollow.

Compared with the prior art, the present invention has the following beneficial effects:

1, the processing technology of the snake bone joint of the present invention is simple, greatly breaks through the wall thickness size limit of the snake bone joint processing technology of the prior art, and the strength is high, the yield is high, and the cost is low;

2. The hinge device of the present invention corresponds to the traction hole of the built-in traction wire, the hinge device and the traction hole have a certain distance, and the traction wire is not easy to bend and fatigue damage;

3. The present invention realizes the extremely simplified design of the elements constituting the bending part of the endoscope, maximizes the utilization of the inner cavity space, and does not have any waste except for the minimum necessary wall thickness, so that more wires, optical fibers and working channels can be passed through. , which perfectly solves the contradiction of minimizing the outer diameter of the endoscope and maximizing the lumen for many years;

4. The present invention can achieve two-direction bending and four-direction bending through different combinations of snake-bone joints, which greatly breaks through the outer diameter limit of the existing two-direction bending endoscope and four-direction bending endoscope. Engineered to achieve theoretical outer diameter limits.

5. The bending part of the present invention can be bent in two directions or four directions only by the combination of one or two kinds of snake bone joints. The processing of the snake bone joint is simple, and the assembly of the bending part is simple, which is convenient for the snake bone joint. And the large-scale production of bending parts, the cost is far lower than the various bending parts of the existing technology, and the theoretical cost limit can be achieved by engineering, which perfectly solves the low cost of the existing bending part technology of medical disposable endoscopes. Contradiction with high-performance quality.

Description of drawings

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

1-5 are schematic structural diagrams of the existing endoscope bending portion;

6 is a schematic structural diagram of the first embodiment of the bending portion of the endoscope according to the present invention;

7 is a front view of the first embodiment of the bending portion of the endoscope of the present invention and a schematic structural diagram of a single snake-bone joint;

8 is a schematic structural diagram of a second embodiment of the bending portion of the endoscope according to the present invention;

9 is a front view of a second embodiment of the bending portion of an endoscope of the present invention and a schematic structural diagram of a single snake-bone joint;

10 is a schematic structural diagram of a third embodiment of the bending portion of the endoscope according to the present invention;

11 is a schematic structural diagram of a fourth embodiment of the bending portion of the endoscope according to the present invention;

12 is a front view of a fourth embodiment of the bending portion of an endoscope of the present invention and a schematic structural diagram of a single snake-bone joint;

13 is a schematic structural diagram of a fifth embodiment of a bending portion of an endoscope according to the present invention;

14 is a schematic structural diagram of a single snake-bone joint of the fifth embodiment of the bending portion of the endoscope of the present invention.

The figure shows:

Operation line 1

snake bone joint 2

first notch 3

second gap 4

Block 5

Limit guide surface 6

Via 7

Detailed ways

The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.

The requirement of ultra-thin-diameter bendable endoscopes is to minimize the outer diameter so as to easily enter into the urethra, biliary tract, lacrimal duct, cardiovascular, etc. of the human body, as well as ultra-small lumens in the aerospace and military industries. But the lumen has to be maximized to pass relatively many wires, fibers, working channels, etc. The more wires, the higher the number of pixels of the camera, and the clearer the image; the more optical fibers, the higher the illumination intensity; the larger the working channel, the more functional surgical instruments can be used, which is conducive to the minimally invasive surgery and many more. In view of the above problems, the present invention creatively proposes: each snake joint includes a hinge device, and the hinge device is matched with the hinge device of the adjacent snake joint; each snake joint is further provided with at least two traction holes in the circumferential direction , to pass through the traction wire; the hinge device and the two opposite traction holes are set correspondingly or 90° dislocated; the hinge device and the traction hole have a certain distance; the traction hole is tangent to the inner hole of the snake bone joint, and the traction hole and the traction wire The gap is not greater than the wall thickness of the snake bone joint to prevent the failure of the adjacent snake bone joints such as dislocation and disjoint, resulting in the failure of the bending part.

Example 1:

Specifically, as shown in FIGS. 6 and 7 , according to the first embodiment provided by the present invention, it includes an operation wire 1 and a plurality of serpentine joints 2 , wherein: the plurality of serpentine joints 2 are hinged in sequence to form a bending unit; the operation wire 1 The bending unit is operated to form bending in two directions. One end face of the snake bone joint 2 is provided with two first notches 3 and two second notches 4, and the two first notches 3 and the two second notches 4 are staggered at equal intervals in the circumferential direction, and the first notches 3 It is exactly the same as the second notch 4. A clamping block 5 is provided at the position corresponding to the two first notches 3 on the other end surface of the snake-bone joint 2 .

The snake-bone joint 2 is provided with a limit guide surface 6 for limiting the operation wire. In this embodiment, there are two types of snake-bone joints 2, and the limit guide surface 6 of the first snake-bone joint 2 is arranged on the first Between the notch 3 and the clamping block 5 , the limiting guide surface 6 of the second type of snake-bone joint 2 is set at a position that is 90° misaligned with the first gap 3 in the circumferential direction of the snake-bone joint 1 . During the specific connection, the snake-bone joints 2 of the two structures are alternately connected, and the blocks 5 of the snake-bone joints 2 of the two structures are ensured to be in corresponding positions, and the manipulation wire passes through the inner wall of the first-type snake-bone joint 2 in turn, The limit guide surface 6 of the second type of snake-bone joint 2 realizes the bending angle control in two directions.

Example 2:

As shown in Figures 8 and 9, according to the second embodiment provided by the present invention, it includes an operation wire 1 and a plurality of serpentine joints 2, wherein: a plurality of serpentine joints 2 are hinged in sequence to form a bending unit; the operation wire 1 operates the bending unit Bend in both directions. One end face of the snake bone joint 2 is provided with two first notches 3 and two second notches 4, and the two first notches 3 and the two second notches 4 are staggered at equal intervals in the circumferential direction, and the first notches 3 It is exactly the same as the second notch 4. A clamping block 5 is provided at the position corresponding to the two first notches 3 on the other end surface of the snake-bone joint 2 .

The snake-bone joint 2 is provided with a limit guide surface 6 for limiting the position of the operation wire. In this embodiment, there is only one structure of the snake-bone joint 2 , and the limit guide surface 6 of the snake-bone joint 2 is arranged in the first notch 3 . Between the block 5 and the block 5, during the specific connection, the adjacent snake joints 2 are connected at a staggered 90°, and the blocks 5 of the adjacent snake joints 2 are in a staggered 90° position, and the manipulation line passes through the interval in turn. The limit guide surface 6 of the snake bone joint 2, and realize the four-direction corner control.

Example 3:

As shown in FIG. 10 , according to the third embodiment provided by the present invention, it includes an operation wire 1 and a plurality of serpentine joints 2, wherein: a plurality of serpentine joints 2 are hinged in sequence to form a bending unit; the operation wire 1 operates the bending unit to form two bending in one direction. One end face of the snake bone joint 2 is provided with two first notches 3 and two second notches 4, and the two first notches 3 and the two second notches 4 are staggered at equal intervals in the circumferential direction, and the first notches 3 It is exactly the same as the second notch 4. A clamping block 5 is provided at the position corresponding to the two first notches 3 on the other end surface of the snake-bone joint 2 .

The snake-bone joint 2 is provided with a limit guide surface 6 for limiting the operating wire. The limit guide surface 6 of the snake-bone joint 2 in this embodiment is arranged between the first gap 3 and the clamping block 5 and is connected with the first notch 3 . The gap 3 is in a position of 90° dislocation in the circumferential direction of the snake bone joint 1. During the specific connection, the adjacent snake bone joints 2 can be connected at a staggered 90°, and the blocks 5 of the adjacent snake bone joints 2 are in a staggered 90° connection. ° position, the control wire passes through the limit guide surface 6 of the snake-bone joint 2 in turn, and realizes the four-direction bending angle control. Adjacent snake-bone joints 2 can also be connected correspondingly, and the blocks 5 of the adjacent snake-bone joints 2 are in the same straight line position, and the manipulation line passes through the limit guide surface 6 of the snake-bone joint 2 in turn, and realizes two directions. corner control.

Example 4:

As shown in Figures 11 and 12, according to the fourth embodiment provided by the present invention, it includes an operation wire 1 and a plurality of serpentine joints 2, wherein: a plurality of serpentine joints 2 are hinged in sequence to form a bending unit; the operation wire 1 operates the bending unit Bend in both directions. One end surface of the snake bone joint 2 is provided with two oppositely arranged first notches 3 , and the other end surface of the snake bone joint 2 is provided with a clamping block 5 at a position corresponding to the two first notches 3 .

There are two types of snake-bone joints 2 in this embodiment. The first type of snake-bone joint 2 is provided with a limit guide surface 6 for limiting the position of the operating wire, and the snake-bone joint 2 is provided with two limit guide surfaces 6. The limiting guide surface 6 is arranged in the middle of the two first notches 2 along the circumferential direction of the snake-bone joint 1 and is oppositely arranged. The second type of snake bone joint 2 is not provided with a limit guide surface 6 . In the specific connection, the two types of snake-bone joints 2 are alternately connected, and the positions of the blocks 5 of the adjacent snake-bone joints 2 are in a straight line direction, and the manipulation line passes through the limit of the first type of snake-bone joints 2 in turn. The guiding surface 6 and the inner wall of the second type of snake-bone joint 2 realize the control of bending angles in two directions.

Example 5:

As shown in FIGS. 13 and 14 , according to the fifth embodiment provided by the present invention, an operation wire 1 and a plurality of serpentine joints 2 are included, wherein: the plurality of serpentine joints 2 are hinged in sequence to form a bending unit; the operation wire 1 operates the bending unit Bend in both directions. One end surface of the snake bone joint 2 is provided with two oppositely arranged first notches 3 , and the other end surface of the snake bone joint 2 is provided with a clamping block 5 at a position corresponding to the two first notches 3 .

The snake-bone joint 2 in this embodiment is provided with a limit guide surface 6 for limiting the operation wire, and only one limit guide surface 6 is provided on the snake-bone joint 2, and the limit guide surface 6 is arranged along the snake-bone. The middle of the two first notches 2 in the circumferential direction of the joint 1 . During the specific connection, the adjacent snake-bone joints 2 are connected by rotating 180°, and the positions of the blocks 5 of the adjacent snake-bone joints 2 are in a straight line direction, and the manipulation lines pass through the first snake-bone joint in sequence. 2 and the inner wall of the second serpentine joint 2, and realize the control of the bending angle in two directions.

The invention can realize bending in two directions and bending in four directions through different combinations of snake-bone joints, which greatly breaks through the outer diameter limit of the existing two-direction bending endoscope and four-direction bending endoscope.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essential content of the present invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily, provided that there is no conflict.

Claims (10)

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

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

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.

2. The bending portion of an endoscope as claimed in claim 1, wherein first notches are formed on two sides of one end surface of each snake bone joint, a clamping block matched with the first notch is arranged at a corresponding position on the other end surface of each snake bone joint, and the clamping block of one snake bone joint is clamped into the first notch of the adjacent snake bone joint and can be hinged and rotated in the first notch.

3. The endoscope bending section according to claim 2, wherein the side surface of the snake bone joint is provided with at least one stopper guide surface recessed from the side surface of the snake bone joint in the axial direction of the snake bone joint, the stopper guide surface being provided between two first notches in the circumferential direction of the snake bone joint.

4. The bending portion of an endoscope according to claim 2, further comprising a connecting wire fixedly connected to inner walls of the plurality of segments of the snake bone joint.

5. The endoscope bending section according to claim 2, wherein second notches identical to the first notches are provided on the other two sides of one end surface of the snake bone joint.

6. The bending portion of an endoscope according to claim 5, 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:

mode 1: a limiting guide surface is arranged between each first notch and the corresponding fixture block;

mode 2: limiting guide surfaces are arranged at the positions, which are staggered with each first notch at a set angle in the circumferential direction of the snake bone joint;

mode 3: the position between each first gap and the corresponding fixture block, and the position dislocated with each first gap in the circumferential direction of the snake bone joint at a set angle are provided with a limiting guide surface.

7. The endoscopic flexure of claim 6,

when the clamping blocks of the adjacent snake bone joints are correspondingly arranged, the bending units form 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.

8. The bending portion of an endoscope according to claim 2, wherein the other end surface of the snake bone joint and the surfaces of the two sides of the fixture are at a predetermined angle.

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.

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