WO2020135363A1 - Bending part of endoscope, and endoscope - Google Patents

Abstract

Provided are a bending part (21) of an endoscope, and an endoscope (20). The bending part (21) of an endoscope comprises multiple bending blocks (10), which are connected end to end, wherein adjacent bending blocks (10) are connected by means of a connecting part (11), the connecting part (11) comprises a groove (12) and a bulge (13), and the bulge (13) is rotatably received in the groove (12). End faces of the bending block (10) are respectively provided with an abutting surface (14) on two sides of the connecting part (11), the bulges (13) rotate in a relative manner to the maximum angle in the grooves (12), and abutting surfaces (14) of two adjacent bending blocks (10) abut against each other, such that the two bending blocks (10) form the maximum bending angle therebetween and are in a locked state. Annular arms (15) are respectively provided on two sides of the bulge (13), annular slots (16) are respectively provided on two sides of the groove (12), and the annular arms (15) are correspondingly received in the annular slots (16). The annular arm (15) is rotatably received in the annular slot (16), and the angle corresponding to an arc-shaped sliding track of the annular arm (15) along the annular groove (16) is greater than or equal to the maximum angle of rotation of the bulge (13) relative to the groove (12). The bending part (21) of an endoscope can maintain a stable connection between two bending blocks (10).

Description

Endoscope bending part and endoscope

This application requires: China Patent Application 2018115927668 filed on December 25, 2018, with the invention titled "Endoscopic Bend and Endoscope"; filed on December 25, 2018, with the invention titled "Endoscopic Bend The priority of the Chinese patent application 2018115927564 of "Ministry and Endoscope" is hereby incorporated by reference in its entirety.

Technical field

The invention relates to an endoscope component, in particular to a curved part of an endoscope and an endoscope.

Background technique

The speculum is a very widely used medical and industrial testing instrument. The bending part is bent by a wire rope to pull a plurality of snake bone joints connected to each other to achieve bending change. Adjacent snake bone joints are connected by rivets to form hinges, thereby achieving relative rotation.

However, due to the high accuracy requirements of the manufacturing and assembly processes of the rivet riveting connection, if there is a slight error in the production process or operation process, it will cause certain defects in the riveting connection between the two snake bone joints. Especially for the small-diameter endoscope with a small inner diameter, it is more difficult to realize the connection method of rivet fixing between the two snake bone joints.

Therefore, in order to realize the smooth manufacture of endoscopes with a small inner diameter, a snake bone joint without rivets is developed and produced, and two adjacent snake bone joints are not riveted by rivets. At the same time, since no rivets are provided, the connection strength between two adjacent snake bone joints is weak. During use, the joint between two adjacent snake bone joints is easily deformed or displaced, resulting in the relative rotation between the two adjacent snake bone joints, which affects the normal use of the endoscope.

Summary of the invention

An object of the present invention is to provide a bending portion and an endoscope of an endoscope capable of maintaining stable connection between two bending blocks.

A bending part of an endoscope includes a plurality of bending blocks connected in sequence, and two adjacent bending blocks are rotatably connected by a connecting part, the connecting part includes a groove and a protrusion, and the protrusion is rotatable Accommodated in the groove, the end faces of the bending block are respectively provided with abutment surfaces on both sides of the connecting part, the protrusion rotates relatively to the maximum angle in the groove, two adjacent The abutment surfaces of the bending pieces are in contact, so that the two bending pieces are at the maximum bending angle, the heights of the plurality of bending pieces are the same, and the plurality of bending pieces are divided into multiple groups along the extending direction of the bending portion In the bending block group, the maximum bending angle of the bending block group near the front end of the bending portion is the largest.

In one embodiment, the bending block group includes a first bending block group and a second bending block group near the front end of the endoscope bending portion.

In one embodiment, the total number of bending blocks of the first bending block group is smaller than the total number of bending blocks of the second bending block group.

In one of the embodiments, the contact surface of the bending blocks of the first bending block group is the first contact surface, and the contact surface of the bending blocks of the second bending block group is the second contact surface. The arc of the first abutment surface is greater than the arc of the second abutment surface.

In one embodiment, annular arms are provided on both sides of the protrusion, and annular grooves are provided on both sides of the groove respectively, and the annular arms are correspondingly received in the annular grooves. It is rotatably accommodated in the annular groove, and the angle corresponding to the arc sliding track of the annular groove of the annular arm is equal to the maximum angle of relative rotation of the protrusion and the groove.

In one embodiment, there are a plurality of ring arms, and there are a plurality of ring grooves, and the center angles of the plurality of ring arms and the plurality of ring grooves are the same.

In one embodiment, the annular groove is symmetrically arranged on both sides of the groove, and the annular arm is symmetrically arranged on both sides of the protrusion.

In one of the embodiments, the bending block is provided with a cutting line near one end surface, and between the end surface of the bending block and the cutting line is a punching portion, and the punching portion is recessed toward the inner side of the bending block, A guide portion for forming a pulling wire is formed, and a buffer groove is provided between the cutting wire and the other end face of the bending block, and the buffer groove is used to buffer the press pressure.

In one embodiment, the length of the buffer groove is greater than the length of the cutting line.

In one embodiment, the length of the cutting line is at least 1/2 of the length of the buffer groove.

A bending part of an endoscope includes a plurality of bending blocks connected end to end, adjacent two bending blocks are connected by a connecting part, and the connecting part includes a groove and a protrusion, and the protrusion can be rotatably received In the groove, the end faces of the bending block are respectively provided with abutting surfaces on both sides of the connecting portion, the protrusion rotates relatively to the maximum angle in the groove, and the two adjacent bends The abutment surfaces of the blocks abut, so that the two bending blocks are at the maximum bending angle and enter the locked state;

Ring arms are respectively provided on both sides of the protrusion, and ring grooves are respectively provided on both sides of the groove, the ring arms are correspondingly received in the ring grooves, and the ring arms are rotatably received in the ring In the groove, the angle corresponding to the circular sliding path of the annular arm along the circular groove is greater than or equal to the maximum angle of relative rotation of the protrusion and the groove.

In one embodiment, there are a plurality of ring arms, and there are a plurality of ring grooves, and the center angles of the plurality of ring arms and the plurality of ring grooves are the same.

In one embodiment, an auxiliary arm is formed between two adjacent annular grooves, and an auxiliary groove is formed between two adjacent annular arms. The auxiliary arm is rotatably received in the auxiliary groove.

In one embodiment, the width of the auxiliary arm is equal to the width of the annular arm, and the width of the auxiliary groove is equal to the width of the annular groove.

In one embodiment, there are an even number of annular arms on one side of the protrusion, and an even number of annular grooves on one side of the groove.

In one embodiment, the annular groove is symmetrically arranged on both sides of the groove, and the annular arm is symmetrically arranged on both sides of the protrusion.

In one embodiment, the axis of symmetry of the annular groove intersects the axis of symmetry of the plurality of annular arms.

In one embodiment, the annular grooves are distributed symmetrically about the center of the groove, and the annular arms are distributed symmetrically about the center of the protrusion.

In one of the embodiments, two connecting portions are provided between two adjacent bending blocks, and the two connecting portions are oppositely arranged along the radial direction of the bending block.

An endoscope includes a traction wire and a bending portion. The traction wire is provided in the bending portion, and the traction wire is connected in series to a plurality of the bending blocks.

The bending part of the above endoscope does not affect the normal use and bending angle of the bending part, and the ring arm and the ring groove cooperate to disperse the force between the two bending blocks and enhance the strength between the two bending blocks. Connection strength. To avoid the displacement of the protrusion from the groove due to excessive bending torque, destroy the rotatable connection between the two bending pieces.

Moreover, since the angle corresponding to the arc-shaped sliding track of the annular groove of the annular arm is greater than or equal to the maximum angle of relative rotation of the protrusion and the groove, the length of the annular groove is restricted to prevent the relative sliding between the protrusion and the groove So that the maximum angle between the central axes of the two bending blocks can meet the design requirements.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of a stereoscopic structure of an endoscope according to this embodiment;

2 is a perspective view of a curved portion of the endoscope of this embodiment;

3 is a schematic structural view of another state of the curved portion of the endoscope shown in FIG. 2;

4 is a schematic structural view of another embodiment of the bent portion shown in FIG. 2;

FIG. 5 is a schematic structural diagram of a connecting block of the connecting portion shown in FIG. 3.

Reference numerals are described as follows: 20, endoscope; 21, bending part; 22, pulling wire; 23, hose; 201, front end of endoscope; 202, rear end of endoscope; 10, bending block; 10A, first Bending block group; 10B, second bending block group; 11A, first bending block; 11B, second bending block; 11, connecting portion, 12, groove; 13, protrusion; 14, abutment surface. 15, 25, annular arm; 251, first annular arm; 252, second annular arm; 16, 26, annular groove; 261, first annular groove; 262, second annular groove; 17, auxiliary arm, 18, auxiliary Groove; 19, punching line; 191, buffer groove.

detailed description

Although the present invention can be easily expressed as different forms of implementations, only some of the specific implementations are shown in the drawings and will be described in detail in this specification, and it is understood that this specification should be regarded as this An exemplary description of the principles of the invention is not intended to limit the invention to what is described herein.

Thus, one feature indicated in this specification will be used to describe one of the features of one embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined to show possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless stated otherwise, the combinations described are not intended to be limiting.

In the embodiments shown in the drawings, indications of directions (such as up, down, left, right, front, and back) are used to explain that the structures and movements of various elements of the present invention are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indications of these directions also change accordingly.

The embodiments of the present invention will be further elaborated below in conjunction with the drawings of this specification.

Referring to FIG. 1, the present invention provides an endoscope 20 and an endoscope bending portion 21.

An endoscope 20 includes a curved portion 21 and a pulling wire 22 provided in the curved portion 21. The pulling wire 22 pulls the bent portion 21 and bends the bent portion 21 to serve the purpose of pulling the bent portion 21 to bend.

The plurality of bending pieces 10 are connected in series by the pull wire 22 in sequence. The bending portion 21 includes a plurality of bending pieces 10 connected in sequence. The bending block 10 includes a head bending block near the front end 201 of the endoscope, a tail bending block close to the rear end 202 of the endoscope, and a middle bending block between the head bending block and the tail bending block. The structure of the first bending piece and the tail bending piece is similar to the structure of the middle bending piece, the difference is mainly that the front end of the first bending piece and the rear end of the tail bending piece are not provided with a connecting portion for connecting the bending piece, so that the head The bending block is the bending block at the forefront, and the bending block at the tail is the bending block at the rearmost end.

Please refer to FIG. 2. The middle bending block is taken as an example for description below: two adjacent bending blocks 10 are connected by a connecting portion 11. Moreover, specifically, two connecting portions 11 are provided between two adjacent bending blocks 10, and the two connecting portions 11 are arranged oppositely in the radial direction of the bending block 10. That is, two adjacent connecting pieces 10 are rotatably connected by two connecting portions 11, and the two connecting portions 11 are located on the same straight line.

Specifically in this embodiment, the connecting portion 11 includes a groove 12 and a protrusion 13. The protrusion 13 is rotatably received in the groove 12. The groove 12 is adapted to the shape of the protrusion 13 so that the protrusion 13 can be limitedly received in the groove 12. And the open end of the groove 12 is contracted to avoid the protrusion 13 from escaping from the groove 12. Specifically, the groove 12 is a circular groove 12, and the shape of the protrusion 13 is circular. Moreover, since the protrusion 13 and the groove 12 are located on the annular side wall of the bending block 10, both the protrusion 13 and the groove 12 have an arc. Since the inner diameters of the two adjacent bending blocks 10 are the same, the bending arcs of the protrusion 13 and the groove 12 are the same.

The connecting portion 11 of one of the bending blocks 10 may be a groove 12 or a protrusion 13, as long as the connecting portion 11 of the other bending block 10 connected thereto can be mated with it. Moreover, the connecting portions 11 are provided on both sides of the bending block 10, and the front and rear surfaces of one bending block 10 may include four grooves 12, or four protrusions 13, or two grooves 12 or two protrusions From 13. For example, when the connecting portion 11 of one bending block 10 is a groove 12, the adjacent bending blocks 10 are provided with protrusions 13 as long as the two adjacent bending blocks 10 can be cooperatively connected.

Specifically in this embodiment, the curved block 10 is provided with two grooves 12 at one end and two protrusions 13 at the other end. Moreover, the two grooves 12 are located on the same straight line, and the two protrusions 13 are located on the same straight line. The straight line where the two grooves 12 are located and the straight line where the two protrusions 13 are located are perpendicular to each other. When the adjacent three bending blocks 10 relatively rotate, the above-mentioned four sets of grooves 12 and the protrusions 13 cooperate with each other, and the connecting portion 11 connecting the adjacent three bending blocks 10 is located on four parallel lines. Therefore, the bending portion can be rotated in four directions, and the twisting and turning angle of the bending portion can be adjusted relatively freely and accurately. The curved part with four rotation directions is suitable for a cavity with a large inner diameter, such as an intestinal cavity and a gastric cavity.

It can be understood that the connecting portions 11 connecting the adjacent three bending blocks 10 are located on two parallel lines. Then, the bending portion can be rotated in two directions, and the rotation angle of the bending portion can be controlled more conveniently. The curved part with two rotation directions is suitable for a cavity with a small inner diameter, such as a lung cavity.

The end surfaces of the bending block 10 are provided with abutting surfaces 14 on both sides of the connecting portion 11, when the two abutting surfaces 14 of two adjacent bending blocks 10 abut against each other, the two bending blocks 10 stop rotating, Then the maximum angle between the two bending blocks 10 is reached. The protrusion 13 rotates in the groove 12. When the abutting surfaces 14 of the two adjacent bending pieces 10 abut, the protrusion 13 stops rotating, reaching the maximum angle of relative rotation between the protrusion 13 and the groove 12.

Please refer to FIG. 3, specifically in this embodiment, the abutment surface 14 is a circular arc-shaped concave surface. When the two abutting surfaces 14 abut against each other, the arc-shaped concave surface can enable the two abutting surfaces 14 to maintain a larger area of contact, so that the two bending blocks 10 can maintain a stable position.

The lowest point of the arc-shaped concave surface is opposed to the connecting portion 11. When the lowest points of the contact surfaces 14 of the two bending blocks 10 abut against each other, the maximum angle between the central axis A-A and the central axis B-B of the two bending blocks 10 is ringed. The angle of the maximum included angle is designed according to the use requirements of the endoscope. For different types of endoscopes and different use requirements, the maximum included angle between the central axes of two adjacent bending blocks 10 is also Can be different.

In addition, the contact surface 14 is rounded. On the one hand, the abutment surface 14 after rounding can improve the surface smoothness of the curved portion, and avoid the sharp side edges of the abutment surface 14 from affecting the movement of the endoscope. Moreover, when the two abutting surfaces 14 abut against each other, the interference between the abutting surfaces 14 after the rounding can avoid interference between the two abutting surfaces 14 and ensure the formation between the two bending blocks 10 The included angle is the same size, which improves the bending accuracy of the endoscope.

The protrusion 13 relatively rotates to the maximum angle in the groove 12, and the abutment surfaces 14 of the two adjacent bending blocks 10 abut, so that the two bending blocks 10 are at the maximum bending angle and enter the locked state.

The plurality of bending pieces 10 are divided into a plurality of bending piece groups along the extending direction of the bending portion. The maximum bending angles of two adjacent bending blocks of different bending block groups are different. When multiple bending blocks located in the same bending block group are bent to the maximum bending angle, the multiple bending blocks are located on the same circumference. Therefore, different bending block groups correspond to circles with different bending radii.

The bending block group may include multiple groups. For example, three groups, four groups, etc., according to different design requirements, you can design a plurality of bending block groups with different bending radii.

Please refer to FIG. 2 again. Specifically, in this embodiment, the bending block group includes a first bending block group 10A and a second bending block group 10B that are close to the front end of the bending portion of the endoscope. The first bending block group 10A includes a plurality of first bending blocks 11A. The second bending block group 10B includes a plurality of second bending blocks 11B. The contact surface of the first bending block 11A is the first contact surface 14A, and the contact surface of the second bending block 11B is the second contact surface 14B. The curvature of the first contact surface 14A is greater than the curvature of the second contact surface 14B. Therefore, the maximum bending angle of two adjacent first bending pieces 11A is greater than the maximum bending angle of two adjacent second bending pieces 11B.

The length of the bent portion 10 is 104 mm. The bending portion 10 includes 30 bending pieces 11. Therefore, the number of bending pieces 11 provided per unit length of the bending portion 10 is large, so as to achieve the purpose of enhancing the overall strength of the bending portion and accurately adjusting the bending angle.

The maximum bending angle of two adjacent first bending pieces 11A of the first bending piece group 10A is the largest. Since the first bending block group 10A is located at the front end of the curved portion of the endoscope, during the actual medical operation, the front end of the endoscope often needs to enter the inside of a specific organ. Therefore, the front end of the endoscope should correspond to the more curved Cavity. The maximum bending angle of the two adjacent first bending blocks 11A of the first bending block group 10A is the largest, which can facilitate the front end of the endoscope to be bent at a large angle to smoothly bend into the inside of the organ.

The bending angle corresponding to the first bending block group 10A can reach 100 degrees to 120 degrees. When the endoscope is used in the stomach, because the cavity in the stomach is relatively curved, the first curved block group 10A can smoothly enter the curved cavity in the front of the stomach, and the second curved block group 10B can be located in the rear Inside the main cavity, easy to use and operate.

The heights of the plurality of bending pieces 11 are the same, that is, the center distance of any two adjacent bending pieces 11 is the same. Then the structure of the bending part is simple and the design is convenient. Moreover, keeping the bending portion 10 of the same mass and strength and the same strength is helpful for the doctor to grasp the use during the operation.

In order to satisfy the layout of each structure of the bending block and the requirements of the use strength of each structure, the height of the bending block is as small as possible. The bending block 11 with a small height increases the number of bending blocks corresponding to each bending block, improves the control accuracy of the bending block group, and facilitates the endoscope to smoothly enter each bending cavity. Specifically, the height of the curved block is 2.6 mm.

The total number of bending blocks of the first bending block group 10A is smaller than the total number of bending blocks of the second bending block group 10B. Since the bending angle corresponding to the first bending block group 10A is relatively large, a relatively small number of first bending blocks can realize bending and bending at a relatively large angle. Specifically, the first bending block group 10A includes 12 bending blocks, and the second bending block group 10B includes 18 bending blocks.

Specifically in this embodiment, annular arms 15 are respectively provided on both sides of the protrusion 13, and annular grooves 16 are respectively provided on both sides of the groove 12. The ring arm 15 is correspondingly received in the ring groove 16. The ring arm 15 is rotatably received in the ring groove 16.

The bending pieces 10 of the bending portion of this embodiment are connected by a connecting portion 11, and the two connecting portions 11 are rotatably connected by a protrusion 13 and a groove 12, and are also rotatable by a ring arm 15 and a ring groove 16 The connection makes it possible to enhance the connection strength of the connection portion 11. When the bending part is bent by force, the force between the two bending pieces 10 can be dispersed between the protrusion 13 and the groove 12 and between the ring arm 15 and the ring groove 16 to avoid the concentration of the force and make the two The connecting portion 11 between the bending pieces 10 is deformed by force, which affects the normal use of the bending portion.

There may be one or more annular arms 15 and annular grooves 16. The annular groove 16 is symmetrically provided on both sides of the groove 12. The ring arms 15 are symmetrically arranged on both sides of the protrusion 13. Therefore, the arc lengths of the annular grooves 16 on the left and right sides and their corresponding center angles are equal, and the arc lengths of the ring arms 15 on the left and right sides and their corresponding center angles are equal.

Moreover, the axis of symmetry of the ring groove 16 is parallel to the axis of symmetry of the plurality of ring arms 15 so that the ring groove 16 and the ring arm 15 are orthogonally connected. Therefore, the angle between the two axes of symmetry is the angle of relative rotation between the two bending blocks 10.

In other embodiments, the axis of symmetry of the annular groove 16 intersects the axis of symmetry of the plurality of annular arms 15. Then, the annular groove 16 and the annular arm 15 are not orthogonal. Similarly, when the two bending pieces 10 rotate relatively, the ring arm 15 can also rotate relatively in the ring groove 16.

It can be understood that the arc lengths of the annular grooves 16 on the left and right sides and their corresponding center angles may also be unequal. Correspondingly, the arc lengths of the ring arms 15 on the left and right sides and the corresponding center angles may also be unequal. For example, referring to FIG. 4, the arc length of the first annular groove 261 on one side is small, and the arc length of the second annular groove 262 on the other side is large. Accordingly, the arc length of the first ring arm 251 on one side is also small, and the arc length of the second ring arm 252 on the other side is also large. The first ring arm 251 rotates along the first ring groove 261 and the second ring arm 252 rotates along the second ring groove 262. As long as the arc of rotation of the ring arm 25 in the ring groove 26 is the same. It can also be achieved that the ring arms 25 on the left and right sides rotate smoothly in the ring groove 26, and the relative rotation of the ring arms 25 on both sides does not interfere with each other.

Referring to FIG. 5, the angle corresponding to the circular sliding path of the circular arm 15 along the circular groove 16 is greater than or equal to the maximum angle of relative rotation of the protrusion 13 and the groove 12. When the abutment surfaces 14 on one side of the two bending blocks 10 abut each other, the ring arm 15 slides in the ring groove 16 and also rotates to the maximum angle. Therefore, the maximum angle formed between the central axes of the two bending blocks 10 and the matching relationship between the annular groove 16 and the ring arm 15 will not affect the maximum angle between the two bending blocks 10, ensuring that the bending portion can be smoothly reached Bending angle requirements, normal use.

Specifically in this embodiment, the angle corresponding to the circular sliding path of the circular arm 15 along the circular groove 16 is equal to the maximum angle of relative rotation of the protrusion 13 and the groove 12. Then, when the two abutting surfaces 14 on one side of the two bending blocks 10 abut against each other, the ring arm 15 slides in the ring groove 16 and the free end of the ring arm 15 also opposes one end of the ring groove 16 Hold, the ring arm 15 also rotates to the very end of the arc-shaped sliding track in the ring groove 16. Then, the rotation position between the two bending pieces 10 at the maximum angle is limited, that is, the two abutment surfaces 14 abut against each other to limit the position, and also the ring arm 15 and the ring groove 16 mutually limit to limit the position.

Specifically in this embodiment, the angle corresponding to the circular sliding path of the circular arm 15 along the circular groove 16 is equal to 13 degrees. The arc corresponding to each annular groove 16 is at least greater than 13 degrees. Then, the maximum angle of relative rotation between the protrusion 13 and the groove 12 is 13 degrees. Please refer to FIG. 3 at the same time. When the angle between the central axis A-A and the central axis B-B of the two bending blocks 10 is 13 degrees, the free end of the ring arm 15 also exactly opposes the end of the ring groove 16.

Please refer to FIG. 4. Specifically, in this embodiment, there are multiple annular arms 15 and multiple annular grooves 16. The central angles corresponding to the plurality of annular arms 15 and the plurality of annular grooves 16 are the same. The plurality of annular arms 15 and the plurality of annular grooves 16 cooperate with each other to increase the contact area between the two bending pieces 10 and can better distribute the force between the two bending pieces 10. Ensure stable connection between the two bending blocks 10.

An auxiliary arm 17 is formed between two adjacent annular grooves 16 and an auxiliary groove 18 is formed between two adjacent annular arms 15. The auxiliary arm 17 is rotatably received in the auxiliary groove 18. Auxiliary grooves 18 are formed between the plurality of annular arms 15, and an auxiliary arm 17 is formed between the plurality of annular grooves 16. Therefore, through the interaction between the auxiliary arm 17 and the auxiliary groove 18, one of the two bending blocks 10 The connection between them further increases the limited relationship.

The width of the auxiliary arm 17 is equal to the width of the ring arm 15, and the width of the auxiliary groove 18 is equal to the width of the ring groove 16. Therefore, while the two bending blocks 10 rotate relatively, the outer side wall of the auxiliary arm 17 and the inner side wall of the auxiliary groove 18 also contact each other, which further increases the contact area between the two bending blocks 10 and effectively disperses the deformation stress.

There are an even number of annular arms 15 on one side of the protrusion 13, and an even number of annular grooves 16 on the side of the groove 12. Specifically in this embodiment, two annular arms 15 are respectively provided on both sides of the protrusion 13, and two annular grooves 16 are respectively provided on both sides of the groove 12. Then, on two adjacent bending blocks 10, one of the bending blocks 10 is provided with two annular grooves 16, and the other bending block 10 is correspondingly provided with two auxiliary grooves 18. Therefore, the strength of the two bending blocks 10 themselves Similar, there will be no big difference, so as to ensure uniform strength of the whole bending part, and ensure uniform stress.

A punching line 19 is cut on the side wall of the bending block 10. There may be one or more stamping lines 19. By punching the punching portion on the side of the punching line 19, the punching portion is bent toward the inside of the bending block 10 to form a lead hole. Then, the pulling wire can pass through the lead hole to connect the pulling wire with the bent portion, and realize the function of guiding the bending of the bent portion.

The opening position of the punching line 19 may be specifically that the protrusion 13 is provided at one end of the bending block 10, and the punching line 19 is provided at the other end of the bending block 10 relative to the protrusion 13. The minimum reduction of the opening position of the punching line 19 has an effect on the strength of the bending block 10, and the strength of the bending block 10 itself is ensured.

When there is one punching line 19, the punching line 19 is disposed near the end surface of the bending block 10, and the punching portion is located between the end surface and the punching line 19. The punched portion is punched toward the inside of the bending block 10 to form a lead hole.

In addition, a buffer groove 191 may be cut between the bending block 10 and the punching line 19 and the protrusion 13. The buffer groove 191 can effectively disperse the punching stress on the bending block 10 and isolate the punching action, so as to reduce the deformation of the bending block 10 caused by the stamping process.

The length of the buffer groove 191 may be greater than the length of the punching line 19 to disperse as much punching stress as possible. The buffer groove 191 can effectively disperse the punching stress on the bending block 10 and isolate the punching action, so as to reduce the deformation of the bending block 10 caused by the punching process, and prevent the protrusion 13 and the groove 12 of the connecting portion 11 A trip occurred.

In other embodiments, there may be multiple punching lines 19, and the punching portion is located between the two punching lines 19. Pressing this punching portion can also form a lead hole toward the bending block 10.

In addition, the lengths of the plurality of punching lines 19 may be different in order to facilitate processing, and the purpose of less affecting the strength of the bending block 10 is.

Specifically, in the present embodiment, the positions of the press line 19 and the buffer groove 191 are such that the press line 19 and the buffer groove 191 are symmetrically distributed about the same axis. The two ends of the press line 19 and the two ends of the buffer groove 191 are arranged symmetrically to each other. When the stamping portion 191 stamps, the pressure is transmitted to the stamping line 19. The punching line 19 is transmitted to the punching pressure and is transmitted to the buffer groove 191 again. The buffer groove 191 is directly opposed to the punching line 19, so that the pressure is evenly distributed on the buffer groove 191.

Moreover, if the length of the press line 191 is at least 1/2 of the length of the buffer groove 191, when the length of the buffer groove 191 is as much as possible to disperse the pressing pressure, the impact of the overall strength of the bending block 10 due to the opening of the buffer groove 191 is avoided. . Specifically, the length of the punching line 191 is 5/7 of the length of the buffer groove 191. Then, the buffer groove 191 can better disperse the punching pressure and ensure the overall strength of the bending block 10.

There may be one or more buffer grooves 191, and stress can be distributed as much as possible. The lengths of the plurality of buffer grooves 191 may be different, and they are arranged side by side.

Specifically in this embodiment, the curved portion of the endoscope is made by laser cutting technology. Therefore, in order to ensure the smoothness of the rotation between the bending blocks 10 and the smoothness between the contact parts, the welding slag (slag) is removed by polishing after laser cutting to ensure the movement between the two bending blocks 10 There is no hindrance.

In addition, in order to ensure that the protrusion 13 slides smoothly in the groove 12 and the ring arm 15 slides smoothly in the ring groove 16, the contact surface between the protrusion 13 and the groove 12 is smooth, and the ring arm 15 is in the ring groove 16 The contact surface is a smooth transition surface, so that the two contact surfaces rotate relatively smoothly.

The endoscope and the curved portion of the endoscope of this embodiment have at least the following advantages over the conventional endoscope:

First, the bending portion 11 of the endoscope is not provided with rivets, and the two adjacent bending blocks 10 are connected by the connecting portion 11. The manufacturing process is simple and easy to implement.

In addition, the endoscope divides the endoscope into a plurality of bending block groups according to different usage requirements, and the bending angles and bending radii corresponding to the multiple bending block groups are different, so as to meet the complex usage environment and meet various usage requirements. In addition, the heights of the bending pieces of the bending portion of the endoscope are the same, which can ensure that the bending portion can evenly distribute the force, maintain the same strength of the bending portion, and facilitate the grasping operation.

The connecting portion 11 interacts with each other through the ring arm 15 and the ring groove 16 to distribute the force between the two bending pieces 10 and prevent the protrusion 13 from falling out of the groove 12. Therefore, even if a rivet is not used for the bending portion of the endoscope, the connection strength between the two bending blocks 10 remains strong, which does not affect the normal use of the endoscope.

In addition, the angle corresponding to the circular sliding path of the circular arm 15 along the circular groove 16 is greater than or equal to the maximum angle of relative rotation of the protrusion 13 and the groove 12 to ensure that the two bending blocks 10 can rotate according to design requirements.

The annular groove 16 is distributed symmetrically about the center of the groove 12, and the multi-stage annular arm 15 is distributed symmetrically about the center of the protrusion 13. Then, the force between the protrusion 13 and the groove 12 can be distributed on the ring arm 15 symmetrically in the center, then the component force received by each ring arm 15 is also distributed in the center symmetrically, which is easy to cancel each other, balance the force, reduce The force between the two small bending blocks 10 ensures the stability of the connection.

Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary rather than limiting. Since the present invention can be embodied in various forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be widely interpreted within the spirit and scope defined by the appended claims Therefore, all changes and modifications falling within the scope of the claims or their equivalents shall be covered by the appended claims.

Claims (20)

A bending part of an endoscope is characterized in that it includes a plurality of bending blocks connected in sequence, and two adjacent bending blocks are rotatably connected by a connecting part, and the connecting part includes a groove and a protrusion. The protrusion is rotatably received in the groove, and the end surface of the bending block is provided with abutment surfaces on both sides of the connecting part, respectively, and the protrusion rotates relatively to the maximum angle in the groove The abutting surfaces of the two adjacent bending pieces are in contact, so that the two bending pieces are at the maximum bending angle, the heights of the plurality of bending pieces are the same, and the plurality of bending pieces are along the extending direction of the bending portion Divided into multiple groups of bending block groups, the maximum bending angle of the bending block group near the front end of the bending portion is the largest. The bending part of the endoscope according to claim 1, wherein the bending block group includes a first bending block group and a second bending block group near the front end of the endoscope bending part. The bending portion of the endoscope according to claim 2, wherein the total number of the bending pieces of the first bending block group is smaller than the total number of the second bending block group. The bending portion of the endoscope according to claim 2, wherein the abutting surface of the bending block of the first bending block group is a first abutting surface, and the bending block of the second bending block group The abutment surface is a second abutment surface, and the arc of the first abutment surface is greater than the arc of the second abutment surface. The curved portion of an endoscope according to claim 1, wherein annular arms are respectively provided on both sides of the protrusion, and annular grooves are respectively provided on both sides of the groove, and the annular arms are correspondingly received In the annular groove, the annular arm is rotatably received in the annular groove, and the angle corresponding to the arc sliding path of the annular arm along the annular groove is equal to the relative rotation of the protrusion and the groove Maximum angle. The bending part of an endoscope according to claim 5, wherein there are a plurality of ring arms, a plurality of ring grooves, and a plurality of ring arms corresponding to a plurality of ring grooves The center angle is the same. The curved portion of the endoscope according to claim 5, wherein the annular groove is symmetrically provided on both sides of the groove, and the annular arm is symmetrically provided on both sides of the protrusion. The bending part of the endoscope according to claim 1, wherein a cutting line is provided near the end surface of one end of the bending block, and a stamping portion is provided between the end surface of the bending block and the cutting line, The punching portion is recessed toward the inner side of the bending block to form a guide portion for passing the pulling wire, and a buffer groove is provided between the cutting line and the other end surface of the bending block, and the buffer groove is used for buffering punching pressure. The curved portion of the endoscope according to claim 8, wherein the length of the buffer groove is greater than the length of the cutting line. The curved portion of the endoscope according to claim 8, wherein the length of the cutting line is at least 1/2 of the length of the buffer groove. A bending part of an endoscope is characterized by comprising a plurality of bending blocks connected end to end, adjacent two bending blocks are connected by a connecting part, and the connecting part includes grooves and protrusions, the protrusions It is rotatably received in the groove, and the end faces of the bending block are provided with abutment surfaces on both sides of the connecting part, respectively, and the protrusion rotates relatively to the maximum angle in the groove, adjacent The abutment surfaces of the two bending blocks are in contact, so that the bending angle between the two bending blocks is at the maximum and the lock state is entered; Ring arms are respectively provided on both sides of the protrusion, and ring grooves are respectively provided on both sides of the groove, the ring arms are correspondingly received in the ring grooves, and the ring arms are rotatably received in the ring In the groove, the angle corresponding to the circular sliding path of the annular arm along the circular groove is greater than or equal to the maximum angle of relative rotation of the protrusion and the groove. The curved portion of an endoscope according to claim 11, wherein there are a plurality of ring arms, a plurality of ring grooves, and a plurality of ring arms corresponding to a plurality of ring grooves The center angle is the same. The curved portion of the endoscope according to claim 12, wherein an auxiliary arm is formed between two adjacent annular grooves, an auxiliary groove is formed between two adjacent annular arms, and the auxiliary arm is rotatable Stored in the auxiliary tank. The curved portion of the endoscope according to claim 13, wherein the width of the auxiliary arm is equal to the width of the annular arm, and the width of the auxiliary groove is equal to the width of the annular groove. The curved portion of the endoscope according to claim 12, wherein the number of the annular arms on the side of the protrusion is an even number, and the number of annular grooves on the side of the groove is an even number. The curved portion of the endoscope according to claim 11, wherein the annular groove is symmetrically provided on both sides of the groove, and the annular arm is symmetrically provided on both sides of the protrusion. The curved portion of the endoscope according to claim 16, wherein the axis of symmetry of the annular groove intersects the axis of symmetry of the plurality of annular arms. The curved portion of the endoscope according to claim 11, wherein the annular groove is distributed symmetrically about the center of the groove, and the annular arms are distributed symmetrically about the center of the protrusion. The bending part of the endoscope according to claim 11, wherein two connecting parts are provided between two adjacent bending blocks, and the two connecting parts are opposed in the radial direction of the bending block Settings. An endoscope, characterized in that it includes a pulling wire and the bending part according to any one of claims 1-19, and the pulling wire is provided in the bending part, and the pulling wire is connected in series to a plurality of the bending Piece.

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