Endoscope and one-way bending variable-pitch snake bone thereof

Abstract

The utility model relates to an endoscope and a one-way bending variable-pitch snake bone, the one-way bending variable-pitch snake bone comprises a head end snake bone joint, a plurality of middle snake bone joints and a tail end snake bone joint which are sequentially and rotatably connected, one end of the head end snake bone joint is connected with an endoscope camera shooting part, and the other end of the head end snake bone joint is connected with an endoscope camera shooting part; one end of the tail end snake joint is connected with the endoscope insertion part; the lengths of the multiple middle snake joints are sequentially increased in the extending direction from the head end to the tail end; the endoscope is composed of the one-way bending variable-pitch snake bone. According to the snake bone, the lengths of the snake bone joints are sequentially increased in the extending direction from the head end to the tail end, the snake bone joints are variable in pitch and are shortened from back to front, the bone pitch is shortened, the position is softer than the position with the long pitch, stress can be bent from the position with the short pitch firstly, the sweeping area of a human body is small, and the operation pain of a patient is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an endoscope and a unidirectional bending variable-distance snake bone thereof. Background Art

[0002] The endoscope has a bending part, and the bending action of the bending part can be controlled by the control personnel. The main components to realize the bending action of the bending part are the snake tube and the control line. The snake bone is generally a superposition of multiple unit sections. The superposition of the bending actions of multiple snake bone units realizes the bending action of the snake bone in a preset direction. At present, the snake bones used for gastroscopes are generally riveted snake bones and non-riveted snake bones. The process of non-riveted snake bones is relatively simple compared to riveted snake bones, so it is widely used.

[0003] In the prior art medical endoscope snake bones, the bone segments have the same length. After the instrument channels and lines are laid inside the snake bones, the tail end is too hard, causing the snake bones to bend first. When the endoscope enters the body for inspection, the sweeping area is too large, causing greater human damage and affecting the patient's surgical experience.

[0004] Authorization announcement number: CN 219982833 U, application date: 2023.04.08, the utility model name is endoscope, snake bone tube and its snake bone assembly, belonging to the field of medical devices. The snake bone assembly includes: a first snake bone segment and a second snake bone segment, the first snake bone segment and the second snake bone segment are movably connected; wherein, the first snake bone segment includes a main body and a male joint, and the second snake bone segment includes two main bodies and a female joint; a pair of male joints are connected to both ends of the main body, and the male joints are evenly arranged at both ends of the main body along the circumferential direction of the main body; a pair of female joints are connected to both ends of the main body, and the female joints are evenly arranged at both ends of the two main bodies along the circumferential direction of the two main bodies; the male joint and the female joint are pivotally connected so that the first snake bone segment rotates relative to the second snake bone segment. The main purpose of this application is to provide a four-directional moving snake bone assembly, which solves the rotation stability of the snake bone segment and further improves the relative rotation amplitude between the snake bone assemblies.

[0005] The above-mentioned prior art snake bone assembly is formed by repeatedly splicing a plurality of first snake bone segments and second snake bone segments, the segments have the same length, and the bending angle is fixed and limited. The biggest drawback is that the snake bone assembly bends from the tail first, sweeping too large an area inside the human body, aggravating the patient's discomfort. Utility Model Content

[0006] In view of the problem that the joints of the above-mentioned prior art snake bone components have the same length, which causes the snake bone components to bend first from the tail and sweep too large an area inside the human body, the purpose of the utility model is to provide a unidirectional bending variable pitch snake bone.

[0007] The technical solution provided by the utility model is:

[0008] A unidirectional bending variable pitch snake bone comprises a head end snake bone segment, a plurality of middle snake bone segments and a tail end snake bone segment which are sequentially connected and rotated, wherein: one end of the head end snake bone segment is connected to an endoscope camera portion; one end of the tail end snake bone segment is connected to an endoscope insertion portion; and the lengths of the plurality of middle snake bone segments sequentially increase in the direction extending from the head end to the tail end.

[0009] Furthermore, the intermediate snake bone segment includes a first snake bone segment and a second snake bone segment rotatably connected to the first snake bone segment; a pair of first splicing parts are circumferentially provided at one end of the first snake bone segment, and a pair of second splicing parts are circumferentially provided at the other end; the central axis of the first splicing part and the central axis of the second splicing part are parallel to each other; the second snake bone segment and the remaining intermediate snake bone segments are provided with the same first splicing part and second splicing part as the first snake bone segment; the first splicing part and the second splicing part of adjacent intermediate snake bone segments are rotatably connected.

[0010] Furthermore, the head end snake bone segment is only provided with a second splicing part, and the tail end snake bone segment is only provided with a first splicing part; the second splicing part of the head end snake bone segment is rotatably connected to the first splicing part of the first snake bone segment; the first splicing part of the tail end snake bone segment is rotatably connected to the second splicing part of the adjacent middle snake bone segment.

[0011] Furthermore, a pair of the first splicing parts have a first top limiting surface on one side end surface and a second top limiting surface on the other side end surface; the circumferential length of the first top limiting surface and the second top limiting surface is basically half of the circumferential length of the snake bone joint; the first top limiting surface and the second top limiting surface are not in the same horizontal plane.

[0012] Furthermore, a pair of the second splicing parts have a first bottom limiting surface on one side end surface and a second bottom limiting surface on the other side end surface; the circumferential length of the first bottom limiting surface and the second bottom limiting surface is basically half of the circumferential length of the snake bone joint; the first bottom limiting surface and the second bottom limiting surface are not in the same horizontal plane.

[0013] Furthermore, when the unidirectional bending variable pitch snake bone returns to its original position, the first limiting surface of the bottom surface of the intermediate snake bone segment abuts against the first limiting surface of the top surface of the adjacent intermediate snake bone segment; there is a rotational gap between the second limiting surface of the bottom surface of the intermediate snake bone segment and the second limiting surface of the top surface of the adjacent intermediate snake bone segment.

[0014] Furthermore, the first splicing portion includes a first convex portion, and an inner side wall of the first convex portion forms a rotating concave portion; a first concave portion is formed between the first convex portion and a first limiting surface of the top surface, and a second concave portion is formed between the first convex portion and a second limiting surface of the top surface.

[0015] Furthermore, the second splicing portion includes a rotating protrusion and protrusions located on both sides of the rotating protrusion; a third recess is formed between the rotating protrusion and the protrusion; the protrusion includes a second protrusion and a third protrusion, the second protrusion is connected to the first limiting surface of the bottom surface, and the third protrusion is connected to the second limiting surface of the bottom surface.

[0016] Furthermore, the rotating protrusions and rotating concave portions of the adjacent intermediate snake bone segments fit together; the first protrusion fits together with the third concave portion; the second protrusion fits together with the first concave portion, and both are provided with a limiting structure; the third protrusion fits together with the second concave portion, and both are provided with a limiting structure.

[0017] Furthermore, the head end snake bone section, the middle snake bone section and the tail end snake bone section are all provided with a pressing groove; the pressing groove is recessed into the snake bone section, and the end of the pressing groove away from the snake bone section is arc-shaped, which is compatible with the traction wire of the endoscope.

[0018] An endoscope comprises an imaging part, a bending part, an operating part and a connecting part which are connected in sequence, wherein the bending part is composed of the one-way bending variable pitch snake bone.

[0019] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0020] The utility model increases the length of the snake bone segments in sequence along the direction from the head end to the tail end of the snake bone. The snake bone segments adopt variable pitch, and the segments become shorter from back to front. Since the segment pitch becomes shorter, this position is softer than the long segment pitch position, and the force will bend from the short segment pitch first. The human body sweeping area is small, reducing the patient's surgical pain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the snake bone in the prior art;

[0022] Figure 2 This is a schematic diagram of the overall structure of a unidirectional bending variable pitch snake bone in an embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the overall structure of an embodiment of the present application when the middle snake bone segment is in a bent state;

[0024] Figure 4 This is a schematic diagram of the overall structure of an embodiment of the present application when the middle snake joint is in a normal state;

[0025] Figure 5 This is a schematic diagram of the overall structure of a single middle snake bone segment in an embodiment of the present application;

[0026] Figure 6 This is a schematic diagram of the overall structure of a single middle snake bone segment at another angle in an embodiment of the present application;

[0027] Figure 7 This is a schematic diagram of the overall structure of a single middle snake bone segment at a third angle in an embodiment of the present application.

[0028] Explanation of the symbols in the schematic diagram:

[0029] 1 head snake bone node;

[0030] The first snake bone joint 2, the first splicing part 21, the first convex part 211, the rotating concave part 212, the first concave part 213, the second concave part 214; the second splicing part 22, the rotating convex part 221, the third concave part 222, the second convex part 223, the third convex part 224; the first limiting surface 23 on the top surface, the second limiting surface 24 on the top surface, the first limiting surface 25 on the bottom surface, the second limiting surface 26 on the bottom surface, the rotating gap 27, and the pressing groove 28;

[0031] The second serpentine segment 3 and the tail end serpentine segment 4. DETAILED DESCRIPTION

[0032] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0033] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0034] The snake bones used in the prior art endoscopes are generally made of repeated splicing of snake bones with the same length, with a fixed and limited bending angle. The biggest drawback is that the snake bone assembly bends from the tail first, sweeping too large an area inside the human body, aggravating the patient's discomfort.

[0035] The present application discloses a unidirectional bending variable pitch snake bone, comprising a head end snake bone section 1, a plurality of middle snake bone sections, and a tail end snake bone section 4. One end of the head end snake bone section 1 is connected to the endoscope camera section, and one end of the tail end snake bone section 4 is connected to the endoscope insertion section. The lengths of the plurality of middle snake bone sections increase in sequence from the head end to the tail end. The head end snake bone section 1, the plurality of middle snake bone sections, and the tail end snake bone section 4 are rotatably connected in sequence. The length of the middle snake bone section is not greater than 3.5 mm. Because the length of the snake bone section changes from small to large, the front end of the snake bone is more flexible than the rear end. Therefore, when the endoscope is scanning inside the human body, the endoscope snake bone can be bent from the front end first, so the scanning area inside the human body is small, reducing the patient's surgical pain.

[0036] Each intermediate snake bone segment, such as the first snake bone segment 2 and the second snake bone segment 3, is provided with a first splicing portion 21 and a second splicing portion 22 to realize the rotational connection of adjacent intermediate snake bone segments. Each intermediate snake bone segment is provided with a pair of first splicing portions 21 along the circumferential direction at one end, and a pair of second splicing portions 22 along the circumferential direction at the other end, the central axis of the first splicing portion 21 and the central axis of the second splicing portion 22 are parallel to each other, the second splicing portion 22 of the first snake bone segment 2 is rotationally connected to the first splicing portion 21 of the second snake bone segment 3, and the remaining adjacent intermediate snake bone segments are rotationally connected in the same way.

[0037] The head end snake bone segment 1 is only provided with a second splicing portion 22, and the tail end snake bone segment 4 is only provided with a first splicing portion 21. The second splicing portion 22 of the head end snake bone segment 1 is rotatably connected to the first splicing portion 21 of the first snake bone segment 2; the first splicing portion 21 of the tail end snake bone segment 4 is rotatably connected to the second splicing portion 22 of the adjacent middle snake bone segment.

[0038] A pair of first splicing parts 21 have a first top limiting surface 23 on one end face and a second top limiting surface 24 on the other end face. The circumferential length of the first top limiting surface 23 and the second top limiting surface 24 is basically half of the circumferential length of the snake bone joint, and the first top limiting surface 23 and the second top limiting surface 24 are not in the same horizontal plane.

[0039] A pair of second splicing parts 22 have a first bottom limiting surface 25 on one end face and a second bottom limiting surface 26 on the other end face. The circumferential length of the first bottom limiting surface 25 and the second bottom limiting surface 26 is basically half of the circumferential length of the snake bone joint, and the first bottom limiting surface 25 and the second bottom limiting surface 26 are not in the same horizontal plane.

[0040] When the unidirectional bending variable pitch snake bone is not bent, the first limiting surface 25 of the bottom surface of the middle snake bone segment abuts against the first limiting surface 23 of the top surface of the adjacent middle snake bone segment, which is used to limit the bending of the snake bone in this direction. There is a rotation gap 27 between the second limiting surface 26 of the bottom surface of the middle snake bone segment and the second limiting surface 24 of the top surface of the adjacent middle snake bone segment, which is used to realize the bending of the snake bone in this direction. The length of the rotation gap 27 is about 0.3 mm, so as to realize the rotation angle of the middle snake bone segment of about 16 degrees.

[0041] Specifically, the first splicing portion 21 includes a first convex portion 211, a rotating concave portion 212 is formed on the inner wall of the first convex portion 211, a first concave portion 213 is formed between the first convex portion 211 and the first limiting surface 23 on the top surface, and a second concave portion 214 is formed between the first convex portion 211 and the second limiting surface 24 on the top surface.

[0042] The second splicing portion 22 includes a rotating protrusion 221 and a protrusion, a third recess 222 is formed between the rotating protrusion 221 and the protrusion, the protrusion includes a second protrusion 223 and a third protrusion 224, the second protrusion 223 is connected to the first limiting surface 25 of the bottom surface, and the third protrusion 224 is connected to the second limiting surface 26 of the bottom surface.

[0043] The rotating convex part 221 of the adjacent middle snake bone joints fits with the rotating concave part 212, the first convex part 211 fits with the third concave part 222, the second convex part 223 fits with the first concave part 213, and the second convex part 223 and the first concave part 213 are provided with a limiting structure, the third convex part 224 fits with the second concave part 214, and the third convex part 224 and the second concave part 214 are provided with a limiting structure. The limiting structure can prevent the adjacent middle snake bone joints from being disjointed. The rotating convex part 221 and the rotating concave part 212 are preferably arc-shaped.

[0044] The first end snake bone section 1, the middle snake bone section and the tail end snake bone section 4 are all provided with a pressing groove 28, which is concave toward the inner side of the snake bone section and is arc-shaped at the end away from the snake bone section, for inserting the endoscope traction wire. Preferably, a pair of pressing grooves 28 are provided on the first end snake bone section 1, the middle snake bone section and the tail end snake bone section 4, for inserting two endoscope traction wires. When the one-way variable pitch snake bone of the present application needs to be straightened after being bent to a certain angle, the traction wire on the outer side of the bend is stressed to straighten the snake bone.

[0045] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A one-way bending variable pitch snake bone, characterized in that: It comprises a head end snake bone segment (1), a plurality of middle snake bone segments, and a tail end snake bone segment (4) which are rotatably connected in sequence, wherein: One end of the first snake bone segment (1) is connected to the endoscope camera part; One end of the tail end snake bone segment (4) is connected to the endoscope insertion part; The lengths of the plurality of middle snake bone segments increase in sequence from the head end to the tail end.

2. The one-way bending variable pitch snake bone according to claim 1, characterized in that: The intermediate snake bone segment comprises a first snake bone segment (2) and a second snake bone segment (3) rotatably connected to the first snake bone segment (2); one end of the first snake bone segment (2) is provided with a pair of first splicing parts (21) along the circumferential direction, and the other end is provided with a pair of second splicing parts (22) along the circumferential direction; the central axis of the first splicing part (21) and the central axis of the second splicing part (22) are parallel to each other; the second snake bone segment (3) and the remaining intermediate snake bone segments are provided with the same first splicing part (21) and second splicing part (22) as the first snake bone segment (2); the first splicing parts (21) and the second splicing parts (22) of adjacent intermediate snake bone segments are rotatably connected.

3. The one-way bending variable pitch snake bone according to claim 2, characterized in that: The head end snake bone segment (1) is only provided with a second splicing portion (22), and the tail end snake bone segment (4) is only provided with a first splicing portion (21); the second splicing portion (22) of the head end snake bone segment (1) is rotatably connected to the first splicing portion (21) of the first snake bone segment (2); and the first splicing portion (21) of the tail end snake bone segment (4) is rotatably connected to the second splicing portion (22) of the adjacent middle snake bone segment.

4. The one-way bending variable pitch snake bone according to claim 2, characterized in that: A pair of the first splicing parts (21) have a first top limit surface (23) on one end surface and a second top limit surface (24) on the other end surface; the circumferential lengths of the first top limit surface (23) and the second top limit surface (24) are substantially half the circumferential length of the snake bone segment; and the first top limit surface (23) and the second top limit surface (24) are not on the same horizontal plane.

5. The one-way bending variable pitch snake bone according to claim 4, characterized in that: A pair of the second splicing parts (22) are provided with a first bottom limit surface (25) on one end surface and a second bottom limit surface (26) on the other end surface; the circumferential length of the first bottom limit surface (25) and the second bottom limit surface (26) is substantially half of the circumferential length of the snake bone joint; the first bottom limit surface (25) and the second bottom limit surface (26) are not on the same horizontal plane.

6. The one-way bending variable pitch snake bone according to claim 5, characterized in that: When the unidirectional bending variable pitch snake bone returns to normal, the first limiting surface (25) on the bottom surface of the intermediate snake bone segment abuts against the first limiting surface (23) on the top surface of the adjacent intermediate snake bone segment; and a rotation gap (27) is provided between the second limiting surface (26) on the bottom surface of the intermediate snake bone segment and the second limiting surface (24) on the top surface of the adjacent intermediate snake bone segment.

7. The one-way bending variable pitch snake bone according to claim 5, characterized in that: The first splicing portion (21) comprises a first convex portion (211), the inner side wall of the first convex portion (211) forming a rotating concave portion (212); a first concave portion (213) is formed between the first convex portion (211) and a first limiting surface (23) on the top surface, and a second concave portion (214) is formed between the first convex portion (211) and a second limiting surface (24) on the top surface.

8. The one-way bending variable pitch snake bone according to claim 7, characterized in that: The second splicing portion (22) comprises a rotating protrusion (221) and protrusions located on both sides of the rotating protrusion (221); a third recess (222) is formed between the rotating protrusion (221) and the protrusion; the protrusion comprises a second protrusion (223) and a third protrusion (224); the second protrusion (223) is connected to a first limiting surface (25) of the bottom surface, and the third protrusion (224) is connected to a second limiting surface (26) of the bottom surface.

9. The one-way bending variable pitch snake bone according to claim 8, characterized in that: The rotating convex part (221) of the adjacent middle snake bone joint fits with the rotating concave part (212); the first convex part (211) fits with the third concave part (222); the second convex part (223) fits with the first concave part (213), and both are provided with a limiting structure; the third convex part (224) fits with the second concave part (214), and both are provided with a limiting structure.

10. The one-way bending variable pitch snake bone according to claim 1, characterized in that: The head end snake bone section (1), the middle snake bone section and the tail end snake bone section (4) are all provided with a pressing groove (28); the pressing groove (28) is recessed into the inside of the snake bone section, and the end of the pressing groove (28) away from the snake bone section is in an arc shape, which is compatible with the traction wire of the endoscope.

11. An endoscope, comprising an imaging unit, a bending unit, an operating unit and a connecting unit connected in sequence, characterized in that: The bending portion is composed of the unidirectional bending variable pitch snake bone described in any one of claims 1-10.

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