Snake bone

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a snake bone. The snake bone is provided with a cavity penetrating in the axial direction, two limiting channels which are oppositely arranged and extend in the axial direction are arranged in the cavity, each limiting channel is used for allowing a traction rope to penetrate through, and each limiting channel is composed of a plurality of stay wire penetrating rings which are sunken towards the inner side in the radial direction and are arranged at intervals in the axial direction. And the distance between two adjacent stay wire perforation rings of the snake bone head part and the snake bone tail part is smaller than the distance between two adjacent stay wire perforation rings of the snake bone middle part. The utility model has the advantages that the design position of the stay wire perforation ring is more reasonable, so that components such as a traction rope, an annunciator, an instrument tube and the like are convenient to penetrate.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a snake bone. Background Art

[0002] An endoscope is a commonly used medical device that enters the human body through the body's natural orifices or small incisions made during surgery. When in use, the endoscope is introduced into the organ to be examined, and the changes in the relevant parts can be directly observed. A snake bone section is provided in the insertion part of the endoscope, and the snake bone section is formed by connecting snake bone units end to end; the snake bone unit is usually a tubular body, and its inner cavity is commonly used to accommodate components such as instrument tubes, signal lines, and traction ropes; by pulling the traction rope, the bending direction and degree of the snake bone section are changed, thereby realizing the bending control of the insertion part.

[0003] For example, Chinese Patent with application number CN202222612466.X discloses a snake bone section, an insertion part and an endoscope. The snake bone section includes a main body and a plurality of traction ropes. The main body includes a plurality of snake bone units. The plurality of traction ropes are circumferentially spaced along the main body. The snake bone unit is provided with a limiting part for the traction rope to pass through, and the limiting parts corresponding to different traction ropes are respectively arranged on different snake bone units.

[0004] In the above solution, a wire threading hole ring (limiting part) is provided on each snake bone unit, and the traction rope passes through the wire threading hole ring to control the bending of the snake bone. However, when some endoscope snake bones are in use, only the head and tail of the snake bone have a higher bending degree, and the bending degree of the middle part of the snake bone is lower. If the snake bone of the above solution is adopted, it has more wire threading hole rings, which is more troublesome when threading the traction rope; and when the bending degree of the middle part of the snake bone is lower, the wire threading hole rings in the middle part of the snake bone are redundant processing, and the redundant wire threading hole rings will also occupy the space in the cavity of the snake bone, affecting the threading of components such as instrument tubes and signal lines. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a snake bone with a more reasonable design position of the wire threading hole ring, so as to facilitate the threading of components such as traction ropes, signal devices and instrument tubes.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: A snake bone is provided with a cavity axially penetrating therethrough. Two oppositely arranged limiting channels extending axially are provided in the cavity. Each limiting channel is used for threading a traction rope. Each limiting channel is composed of a plurality of wire threading hole rings that are recessed radially inward and axially spaced apart. The distance between two adjacent wire threading hole rings at the head and tail of the snake bone is less than the distance between two adjacent wire threading hole rings in the middle of the snake bone.

[0007] In this solution, the distance between two adjacent wire-pulling perforation rings at the head and tail of the snake bone is smaller than that between two adjacent wire-pulling perforation rings in the middle of the snake bone. This setting method does not have wire-pulling perforation rings on all snake bone units, thus reducing the number of wire-pulling perforation rings and facilitating the insertion and installation of the traction rope. At the same time, the wire-pulling perforation rings at the head and tail of the snake bone are closer and more dense, so that it can adapt to the bending of the head and tail of the endoscope during use; while the wire-pulling perforation rings in the middle of the snake bone are farther apart and more dispersed, which is sufficient to meet the bending requirements of the middle part of the snake bone during use. At the same time, in this solution, some snake bone units do not need to be provided with wire-pulling perforation rings, so components such as the instrument tube and signal line can be avoided, thus facilitating the threading of components such as the instrument tube and signal line.

[0008] In summary, the snake bone of this solution can facilitate the threading of the traction rope, signal line and instrument tube components on the premise of meeting the bending requirements.

[0009] Preferably, the two limiting channels are respectively a first limiting channel and a second limiting channel, and the wire-pulling perforation rings of the first limiting channel and the wire-pulling perforation rings of the second limiting channel are staggeredly arranged in the axial direction.

[0010] The wire-pulling perforation rings of the first limiting channel and the wire-pulling perforation rings of the second limiting channel are staggeredly arranged in the axial direction, which can further make way for the threading of the signal line and the instrument tube components. If the wire-pulling perforation rings of the first limiting channel and the wire-pulling perforation rings of the second limiting channel are not staggered, the distance between the two wire-pulling perforation rings is too close, which will reduce the threading space of the signal line and the instrument tube components, thus affecting the threading.

[0011] Preferably, the snake bone is composed of a plurality of snake bone units that are movably connected to each other. The wire-pulling perforation rings are provided on the inner walls of some of the snake bone units. There are at least 2 snake bone units spaced between two adjacent wire-pulling perforation rings at the head and tail of the snake bone, and there are at least 4 snake bone units spaced between two adjacent wire-pulling perforation rings in the middle of the snake bone.

[0012] Through the above solution, the distance between two adjacent wire-pulling perforation rings at the head and tail of the snake bone is made smaller than that between two adjacent wire-pulling perforation rings in the middle of the snake bone.

[0013] Preferably, the number of snake bone units between two adjacent wire-pulling perforation rings gradually decreases from the middle of the snake bone to the head and tail of the snake bone.

[0014] The number of the osteophore units between two adjacent wire-pulling perforation rings gradually decreases from the middle of the osteophore towards the head and the tail of the osteophore, so that the distance between two adjacent wire-pulling perforation rings will not be too large or too small suddenly, thus ensuring the stability of the traction rope when pulling the osteophore. Among them, the gradual decrease can be a uniform decrease or a non-uniform decrease.

[0015] Preferably, there are two sets of mutually matching pivoting structures between two adjacent osteophore units. The two sets of pivoting structures are arranged radially opposite to each other. There are two bending grooves between two adjacent osteophore units. The center of the bending groove is arranged at an angle of 90° with the center of the pivoting structure. The wire-pulling perforation ring and the bending groove are located on the same radial side of the osteophore unit.

[0016] The adjacent two osteophore units are movably connected through the pivoting structure. At the same time, the bending groove can provide space for the two osteophore units when they are bent. At the same time, the wire-pulling perforation ring and the bending groove are located on the same radial side of the osteophore unit, ensuring that the bending force lines are consistent when the traction rope pulls the osteophore to bend. Among them, the pivoting structure can be any existing structure that can realize the bending of the osteophore.

[0017] Preferably, the pivoting structure includes a male joint and a female joint. The male joint is provided with a rotating part and two male rotating parts located on both circumferential sides of the rotating part. A male rotating groove is formed between the rotating part and the two male rotating parts; the female joint is provided with a rotating groove matching with the rotating part and two female rotating parts located on both circumferential sides of the rotating groove and used for matching with the male rotating groove. A female rotating groove for matching with the male rotating part is arranged between the female rotating part and the wall body of the osteophore unit.

[0018] When two osteophore units rotate relatively, the female rotating part slides in the male rotating groove, the male rotating part rotates in the female rotating groove, and at the same time, both the female rotating part and the male rotating part rotate around the rotating part, so as to realize the relative rotation of the osteophore units.

[0019] Preferably, a first hook part is arranged on the inner wall of the male rotating part close to the rotating part, and a second hook part is arranged on the outer wall of the female rotating part deviating from the rotating groove. The first hook part and the second hook part cooperate with each other to prevent the male rotating part and the female rotating part from disengaging from the female rotating groove and the male rotating groove respectively.

[0020] Prevent the male rotating part and the female rotating part from disengaging from the female rotating groove and the male rotating groove respectively, so as to adapt to the large bending angles of the head and the tail of the osteophore and ensure that the osteophore units will not disengage.

[0021] The utility model has the advantages that the design position of the wire-pulling perforation ring is more reasonable, thus facilitating the threading of components such as the traction rope, the signal device and the instrument tube. Description of the Drawings

[0022] Figure 1 Isometric view of the snake bone

[0023] Figure 2 Is Figure 1 Isometric view of the snake bone after rotating 180°.

[0024] Figure 3 Is side view

[0025] Figure 4 Is structural schematic diagram of the pivot joint of the snake bone unit

[0026] Figure 5 Is structural schematic diagram of the pivot joint of the snake bone unit

[0027] Figure 6 Is cross-sectional view of the snake bone

[0028] Reference numerals in the drawings: 1, snake bone unit; 11, snake bone head; 12, middle part of snake bone; 13, snake bone tail; 2, first wire-pulling perforation ring; 21, first limiting channel; 3, second wire-pulling perforation ring; 31, second limiting channel; 4, rotating part; 41, male rotating part; 42, male rotating groove; 43, first hook part; 5, rotating groove; 51, female rotating part; 52, female rotating groove; 53, second hook part; 6, cavity; 7, bending groove Detailed implementation mode

[0029] The following further describes the present utility model according to the drawings and specific embodiments

[0030] As Figures 1 to 3 shown, this embodiment discloses a snake bone, which includes a plurality of snake bone units 1 that are movably connected to each other. Each snake bone unit 1 is hollow and jointly forms a cavity 6 that runs through the snake bone in the axial direction. The cavity 6 is used for threading signal lines, instrument tubes, etc. There are two first limiting channels 21 and second limiting channels 31 that are oppositely arranged and extend in the axial direction in the cavity 6 of the snake bone. Both the first limiting channel 21 and the second limiting channel 31 are used for threading traction ropes. The wire-pulling perforation rings include a first wire-pulling perforation ring 2 and a second wire-pulling perforation ring 3. On the inner wall of the cavity 6 of the snake bone, there are provided a first wire-pulling perforation ring 2 and a second wire-pulling perforation ring 3 that are radially recessed inward. The first wire-pulling perforation ring 2 is arranged along the axial direction to form the first limiting channel 21, and the second wire-pulling perforation ring 3 is arranged along the axial direction to form the second limiting channel 31

[0031] As Figure 1 , Figure 2 and Figure 6As shown, the snake bone includes a snake bone head 11, a snake bone middle part 12, and a snake bone tail 13. On the inner wall of some snake bone units 1, a first wire threading perforation ring 2 and a second wire threading perforation ring 3 are provided, and the first wire threading perforation ring 2 and the second wire threading perforation ring 3 are arranged staggeredly in the axial direction. The number of snake bone units 1 between two adjacent first wire threading perforation rings 2 at the snake bone head 11 and the snake bone tail 13 is at least 2, and the number of snake bone units 1 between two adjacent first wire threading perforation rings 2 in the snake bone middle part 12 is at least 4. The number of snake bone units 1 between two adjacent second wire threading perforation rings 3 at the snake bone head 11 and the snake bone tail 13 is at least 2, and the number of snake bone units 1 between two adjacent second wire threading perforation rings 3 in the snake bone middle part 12 is at least 4.

[0032] The number of snake bone units 1 between two adjacent first wire threading perforation rings 2 and second wire threading perforation rings 3 gradually decreases from the snake bone middle part 12 to the snake bone head 11 and the snake bone tail 13. Specifically, the number of snake bone units 1 between two adjacent first wire threading perforation rings 2 from the snake bone head 11 to the snake bone tail 13 is two, three, five, four, four, two respectively; the number of snake bone units 1 between two adjacent second wire threading perforation rings 3 from the snake bone head 11 to the snake bone tail 13 is three, four, five, five, three respectively.

[0033] As Figure 1 , Figure 4 and Figure 5 shown, two sets of mutually matching pivoting structures are provided between two adjacent snake bone units 1, and the two sets of pivoting structures are arranged radially opposite to each other. Two sets of bending grooves 7 are provided between two adjacent snake bone units 1, and the center of the bending groove 7 forms a 90° angle with the center of the pivoting structure. The first wire threading perforation ring 2 and the second wire threading perforation ring 3 are located on the same radial side of the snake bone unit 1 as the bending groove 7.

[0034] The pivoting structure includes a male joint and a female joint. Each snake bone unit 1 is provided with two male joints and two female joints, and the two male joints and the two female joints are respectively located at the axial two ends of the snake bone unit 1. The male joint is provided with a rotating part 4 and two male rotating parts 41 located on both circumferential sides of the rotating part 4. A male rotating groove 42 is formed between the rotating part 4 and the two male rotating parts 41.

[0035] The female joint is provided with a rotating groove 5 that cooperates with the rotating part 4 and two female rotating parts 51 located on both circumferential sides of the rotating groove 5 and used for cooperating with the male rotating groove 42. A female rotating groove 52 for cooperating with the male rotating part 41 is provided between the female rotating part 51 and the wall body of the snake bone unit 1. When two snake bone units 1 rotate relative to each other, the female rotating part 51 slides in the male rotating groove 42, the male rotating part 41 rotates in the female rotating groove 52, and at the same time, both the female rotating part 51 and the male rotating part 41 rotate around the rotating part 4, thereby realizing the relative rotation of the snake bone unit 1.

[0036] A first hook portion 43 is provided on the inner wall of the male rotating member 41 close to the rotating portion 4, and a second hook portion 53 is provided on the outer wall of the female rotating member 51 deviating from the rotating groove 5. The first hook portion 43 and the second hook portion 53 cooperate with each other to prevent the male rotating member 41 and the female rotating member 51 from disengaging from the female rotating groove 52 and the male rotating groove 42 respectively.

Claims

1. A snake bone, which is provided with a cavity penetrating along the axial direction, and is characterized in that: Two limiting channels which are oppositely arranged and extend along the axial direction are provided in the cavity. Each limiting channel is used for threading a traction rope. Each limiting channel is composed of a plurality of wire-pulling perforation rings which are recessed radially inwards and arranged at intervals along the axial direction. The distance between two adjacent wire-pulling perforation rings at the head and tail of the snake bone is smaller than the distance between two adjacent wire-pulling perforation rings in the middle of the snake bone.

2. The snake bone according to claim 1, wherein: The two limiting channels are respectively a first limiting channel and a second limiting channel. The wire-pulling perforation rings of the first limiting channel and the wire-pulling perforation rings of the second limiting channel are arranged in a staggered manner in the axial direction.

3. The snake bone according to claim 1, characterized in that: The snake bone is composed of a plurality of snake bone units which are movably connected to each other. The wire-pulling perforation rings are provided on the inner walls of some of the snake bone units. There are at least 2 snake bone units spaced between two adjacent wire-pulling perforation rings at the head and tail of the snake bone. There are at least 4 snake bone units spaced between two adjacent wire-pulling perforation rings in the middle of the snake bone.

4. The snake bone according to claim 3, characterized in that: The number of snake bone units between two adjacent wire-pulling perforation rings gradually decreases from the middle of the snake bone towards the head and tail of the snake bone.

5. The snake bone according to any one of claims 1 to 4, characterized in that: Two sets of mutually matching pivot structures are provided between two adjacent snake bone units. The two sets of pivot structures are arranged radially opposite to each other. Two sets of bending grooves are provided between two adjacent snake bone units. The center of the bending groove is arranged at an angle of 90° with the center of the pivot structure. The wire-pulling perforation ring and the bending groove are located on the same radial side of the snake bone unit.

6. The snake bone according to claim 5, characterized in that: The pivot structure includes a male joint and a female joint. The male joint is provided with a rotating part and two male rotating parts located on the circumferential two sides of the rotating part. A male rotating groove is formed between the rotating part and the two male rotating parts. The female joint is provided with a rotating groove matching with the rotating part and two female rotating parts located on the circumferential two sides of the rotating groove and used for matching with the male rotating groove. A female rotating groove for matching with the male rotating part is provided between the female rotating part and the wall body of the snake bone unit.

7. The snake bone according to claim 6, wherein: A first hook part is provided on the inner wall of the male rotating part close to the rotating part. A second hook part is provided on the outer wall of the female rotating part deviating from the rotating groove. The first hook part and the second hook part cooperate with each other to prevent the male rotating part and the female rotating part from separating from the female rotating groove and the male rotating groove respectively.

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