A bending part assembly of a flexible endoscope

Abstract

The present invention relates to a bending portion assembly of a flexible endoscope, comprising a camera seat, a bending serpentine, a braided mesh tube, a sealing hose, and an insertion tube front joint. The camera seat and the insertion tube front joint are respectively arranged at the front and rear ends of the bending serpentine, the braided mesh tube is arranged on the outer periphery of the bending serpentine, and the sealing hose is arranged on the braided mesh tube, the insertion tube front joint, and a portion of the outer periphery of the camera seat to form a sealed connection. The innovation lies in: the connecting ear of the front section tube of the bending serpentine is provided with a corresponding rotating shaft hook, the connecting ear at one end of the middle section tube is provided with a corresponding shaft hole, the connecting ear at the other end is provided with a corresponding rotating shaft hook, and the connecting ear of the rear section tube is provided with a corresponding shaft hole. The front section tube, the middle section tube, and the rear section tube are connected as a whole by the corresponding rotating shaft hook and shaft hole matching structure. The present invention is not only easy to process, but also has high bending positioning accuracy and flexible rotation, making the bending angle more reliable.

Description

Technical Field

[0001] The present invention relates to a snake-bone device, in particular to a bending part assembly of a flexible endoscope, belonging to the technical field of medical endoscopes. Background Art

[0002] Currently, medical flexible endoscopes, both domestically and internationally, are primarily used for examination, diagnosis, and minimally invasive treatment of the human digestive, respiratory, and urinary systems, as well as the ear, nose, and throat. The curved snake in the bending assembly is a key component of both medical and industrial flexible endoscopes.

[0003] The existing snake bones in the prior art include rivet-type snake bones and expansion-type snake bones. Riveted snake bones are prone to bending and deformation of the rivet shaft during riveting due to improper adjustment of the stamping machine and installation of the riveting die, resulting in inflexible snake bone rotation and low yield. Furthermore, the rivet head may be too small, causing the rivet head to fall off. This can easily cause malfunctions or even render the endoscope inoperable due to the curved portion of the endoscope during use. The various segments of the expansion-type snake bones are connected together by a connection structure consisting of a boss and boss groove, or a connection structure consisting of a ball head and ball socket. However, since the boss and boss groove only have three positioning points after contact, the snake bone bending angle may deviate, resulting in poor accuracy. While the ball head and ball socket connection structure can ensure flexible rotation between the different segments, it has a large rotational friction area. Furthermore, this connection structure uses five-point positioning, which also results in relatively low positioning accuracy. Summary of the Invention

[0004] The object of the present invention is to provide a bending portion assembly for a flexible endoscope which is not only easy to process but also has high bending positioning accuracy and flexible rotation, making the bending angle more reliable.

[0005] In order to achieve the above-mentioned object, the technical solution of the present invention is as follows: a bending portion assembly of a flexible endoscope, comprising a camera seat, a bending serpentine, a braided mesh tube, a sealing hose and a front joint of an insertion tube, wherein the camera seat and the front joint of the insertion tube are respectively arranged at the front end and the rear end of the bending serpentine, the braided mesh tube is arranged at the periphery of the bending serpentine, and the sealing hose is arranged at the periphery of the braided mesh tube, the front joint of the insertion tube and a portion of the camera seat to form a sealed connection.

[0006] The curved snake bone includes a front tube and a rear tube, and a curved body composed of a plurality of middle tubes arranged between the front tube and the rear tube. The camera seat is connected to the front tube, and the front joint of the insertion tube is connected to the rear tube.

[0007] The innovation lies in that the curved snake bone is any one of the following two structures:

[0008] The first type is that a pair of symmetrically arranged front connecting ears are extended from the end of one end of the front section tube along its axial direction, and the front connecting ears are provided with a rear rotating shaft hook arranged perpendicular to them.

[0009] A pair of symmetrically arranged middle connecting ears are extended from both ends of the middle section tube, and a middle shaft hole is provided on the middle connecting ear at one end, and a middle rotating shaft hook is provided on the middle connecting ear at the other end.

[0010] A pair of symmetrically arranged rear connecting ears are extended from the end of one end of the rear section tube along the axial direction thereof, and the rear connecting ears have a front axle hole.

[0011] The front connecting ear of the front section tube is inserted into the inner hole of the adjacent middle section tube, and the rear rotating shaft hook is installed in the middle shaft hole of the middle section tube and rotated to fit.

[0012] The middle connecting ear at one end of the middle section tube adjacent to the rear section tube is inserted into the inner hole of the rear section tube, and the middle rotating shaft hook of the middle section tube is installed into the front shaft hole of the rear section tube and rotated to fit.

[0013] The middle connecting ear at one end of the first middle section tube of the two adjacent middle section tubes is inserted into the inner hole of the second middle section tube, and the middle rotating shaft hook on the middle connecting ear is installed into the middle shaft hole of the second middle section tube and rotated together;

[0014] The second type is that a pair of symmetrically arranged front connecting ears are extended from the end of one end of the front section tube along its axial direction, and the front connecting ears have a rear rotating shaft hook arranged perpendicular to them.

[0015] A pair of symmetrically arranged intermediate connecting ears extend from both ends of the middle tube. The intermediate connecting ears at both ends of the middle tube have a 90° phase difference, and one of the intermediate connecting ears is provided with an intermediate shaft hole, and the other intermediate connecting ear is provided with an intermediate rotating shaft hook arranged perpendicular to it.

[0016] A pair of symmetrically arranged rear connecting ears are extended from the end of one end of the rear section tube along the axial direction thereof, and the rear connecting ears have a front axle hole.

[0017] The front connecting ear of the front section tube is inserted into the inner hole of the adjacent middle section tube, and the rear rotating shaft hook is installed in the middle shaft hole of the middle section tube and rotated to fit.

[0018] The middle connecting ear at one end of the middle section tube adjacent to the rear section tube is inserted into the inner hole of the rear section tube, and the middle rotating shaft hook of the middle section tube is installed into the front shaft hole of the rear section tube and rotated to fit.

[0019] The rear middle section tube of the two adjacent middle section tubes is rotated 90° and connected to the front middle section tube. At the same time, the middle connecting ear at one end of the front middle section tube is inserted into the inner hole of the rear middle section tube, and the middle rotating shaft hook on the middle connecting ear is installed into the middle shaft hole of the rear middle section tube.

[0020] In the above technical solution, the first curved serpentine is a two-way serpentine, and the two-way serpentine also includes a steel wire rope. At the same time, the tube wall of each middle section tube in the serpentine is provided with two middle rope holes symmetrically arranged along it, the front section tube is provided with a steel wire rope positioning groove, and the steel wire rope positioning groove is provided with two front rope holes corresponding to the middle rope hole of the middle section tube, partial sections of the traction steel wire rope are embedded in the steel wire rope positioning groove, and the two ends of the traction steel wire rope respectively pass through the corresponding front rope hole on the front section tube and the middle rope hole of each middle section tube and pass out through the rear section tube and the front joint of the insertion tube.

[0021] In the above technical solution, the second type of curved snake bone is a four-directional snake bone, and the four-directional snake bone also includes four traction steel ropes. At the same time, four evenly arranged front rope holes are provided on the circumferential wall of the front segment tube in the snake bone and along its circumferential direction, and four evenly arranged intermediate rope holes are provided on the circumferential wall of each middle segment tube and along its circumferential direction, and the intermediate rope holes correspond to the front rope holes one by one. One ends of the four traction steel ropes are respectively fixed to the corresponding front rope holes of the front segment tube, and pass through the corresponding intermediate rope holes of the middle segment tube in turn, and pass through the front joint of the rear segment tube and the insertion tube.

[0022] In the above technical solution, the middle connecting ear at one end of the middle tube of any one of the curved snake bones has a semicircular through hole and an intermediate spring piece formed by wire cutting, and the intermediate shaft hole is a closed circular shaft hole formed by the semicircular through hole and the semicircular through hole provided on the intermediate spring piece.

[0023] The rear connecting ear of the rear section tube is provided with a semicircular through hole and a rear spring piece formed by wire cutting, and the front shaft hole is a closed circular shaft hole formed by the semicircular through hole and the semicircular through hole provided on the rear spring piece.

[0024] In the above technical solution, any one of the curved snake bones also includes several elastic fixing rings. An elastic fixing ring is provided on the outer periphery of the rear connecting ear of the rear section tube and near the front axle hole to prevent the intermediate rotating shaft hook connected to it from moving. An elastic fixing ring is provided on the outer periphery of the intermediate connecting ear at one end of each middle section tube and near the middle axle hole to prevent the rear rotating shaft hook or the intermediate rotating shaft hook connected to it from moving.

[0025] In the above technical solution, the elastic fixing ring is provided with positioning grooves symmetrically arranged along the elastic fixing ring and used to position the corresponding rear connecting ears or middle connecting ears, and the width of the positioning grooves is equal to the width of the corresponding rear connecting ears or middle connecting ears.

[0026] In the above technical solution, the elastic fixing ring is a closed-loop structure or a structure with a shrinkage notch.

[0027] In the above technical solution, the connection between the rear section tube and the middle section tube and the corresponding elastic fixing ring is also fixed by glue dispensing.

[0028] In the above technical solution, two to four tapered holes are provided on the peripheral wall of the front segment tube in any one of the curved snake bones, which are matched with the camera seat through countersunk screws.

[0029] In the above technical solution, the outer periphery of both ends of the sealing hose and the camera seat and the front joint of the insertion tube are respectively provided with tying wires, and the outer periphery of the sealing hose provided with tying wires is also provided with sealant for improving the overall sealing performance.

[0030] The positive effect of the present invention is that after the bending portion assembly of the flexible endoscope of the present invention is adopted, a pair of symmetrically arranged front connecting ears are extended along the axial direction of the end portion of the front segment tube of the bending snake bone of the present invention, and the front connecting ears are provided with a rear rotating shaft hook arranged perpendicularly thereto.

[0031] A pair of symmetrically arranged middle connecting ears are extended from both ends of the middle section tube, and a middle shaft hole is provided on the middle connecting ear at one end, and a middle rotating shaft hook is provided on the middle connecting ear at the other end.

[0032] A pair of symmetrically arranged rear connecting ears are extended from the end of one end of the rear section tube along the axial direction thereof, and the rear connecting ears have a front axle hole.

[0033] The front connecting ear of the front section tube is inserted into the inner hole of the adjacent middle section tube, and the rear rotating shaft hook is installed in the middle shaft hole of the middle section tube and rotated to fit.

[0034] The middle connecting ear at one end of the middle section tube adjacent to the rear section tube is inserted into the inner hole of the rear section tube, and the middle rotating shaft hook of the middle section tube is installed into the front shaft hole of the rear section tube and rotated to fit.

[0035] The middle connecting ear at one end of the first middle section tube of the two adjacent middle section tubes is inserted into the inner hole of the second middle section tube, and the middle rotating shaft hook on the middle connecting ear is installed into the middle shaft hole of the second middle section tube and rotated together;

[0036] The curved snake bone of the present invention has two structures. The other structure is different from the above structure in that the rear middle section of the two adjacent middle sections is rotated 90 degrees and then connected to the front middle section to form a whole.

[0037] It can be seen that the present invention can not only ensure the rapid assembly of the various connecting rings of the snake bone and the stability of the connection between the various connecting rings, and improve the assembly efficiency, but also make the rotation between the various connecting rings more flexible and precise, and have low production costs. At the same time, the connection between adjacent connecting rings of the present invention adopts a six-point positioning method, which not only has reliable positioning and high precision, but also more reliable bending angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a first specific embodiment of the present invention;

[0039] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle curved snake bone;

[0040] Figure 3 yes Figure 2 Schematic top view of

[0041] Figure 4 yes Figure 2 AA cross-sectional view of ;

[0042] Figure 5 yes Figure 2 Schematic diagram of the structure of the mid-anterior segment tube;

[0043] Figure 6 yes Figure 2 Schematic diagram of the structure of the middle section pipe;

[0044] Figure 7 yes Figure 6 Schematic diagram of the left side;

[0045] Figure 8 yes Figure 2 Schematic diagram of the structure of the middle and rear tube;

[0046] Figure 9 yes Figure 2 Schematic diagram of the structure of the elastic fixing ring;

[0047] Figure 10 It is a structural schematic diagram of a second specific embodiment of the present invention;

[0048] Figure 11 yes Figure 10 Schematic diagram of the structure of the middle bending snake (excluding the traction wire rope);

[0049] Figure 12 yes Figure 11 Schematic top view of

[0050] Figure 13 yes Figure 11 Schematic diagram of the structure of the mid-anterior segment tube;

[0051] Figure 14 yes Figure 13 The left view of

[0052] Figure 15 yes Figure 11 Schematic diagram of the structure of the middle section pipe;

[0053] Figure 16 yes Figure 15 Schematic diagram of the left side;

[0054] Figure 17 yes Figure 15 Schematic top view of . DETAILED DESCRIPTION

[0055] The present invention will be further described below with reference to the accompanying drawings and given embodiments, but the present invention is not limited thereto.

[0056] Example 1

[0057] like Figure 1 、 2 , 3, 4, 5, 6, 7, 8, and 9 show a bending portion assembly of a flexible endoscope, comprising a camera seat 1, a bending serpentine 2, a braided mesh tube 3, a sealing hose 4, and an insertion tube front joint 5. The camera seat 1 and the insertion tube front joint 5 are respectively arranged at the front end and the tail end of the bending serpentine 2, the braided mesh tube 3 is arranged at the periphery of the bending serpentine 2, and the sealing hose 4 is arranged at the braided mesh tube 3, the insertion tube front joint 5, and a partial periphery of the camera seat 1 to form a sealed connection.

[0058] The curved serpentine bone 2 in Example 1 is a two-way serpentine bone. The curved serpentine bone 2 includes a front tube 21 and a rear tube 23, and a curved body composed of a plurality of middle tubes 22 arranged between the front tube and the rear tube. The camera seat 1 is connected to the front tube 21, and the insertion tube front joint 5 is connected to the rear tube 23.

[0059] A pair of symmetrically arranged front connecting ears 212 are extended from one end of the front section tube 21 along its axial direction, and a rear rotating shaft hook 213 arranged perpendicularly thereto is provided on the front connecting ear 212.

[0060] A pair of symmetrically arranged middle connecting ears 222 are extended from both ends of the middle section tube 22, and a middle shaft hole 223 is provided on the middle connecting ear 222 at one end, and a middle rotating shaft hook 224 arranged perpendicularly thereto is provided on the middle connecting ear 222 at the other end.

[0061] A pair of symmetrically arranged rear connecting ears 232 are extended from one end of the rear section tube 23 along its axial direction. The rear connecting ears 232 have a front shaft hole 233.

[0062] The front connecting ear 212 of the front section tube 21 is inserted into the inner hole of the adjacent middle section tube 22, and the rear rotating shaft hook 213 is installed in the middle shaft hole 223 of the middle section tube 22 and rotated to fit.

[0063] The middle connecting ear 222 at one end of the middle section tube 22 adjacent to the rear section tube 23 is inserted into the inner hole of the rear section tube 23, and the middle rotating shaft hook 224 of the middle section tube 22 is installed in the front shaft hole 233 of the rear section tube 23 and rotated to fit.

[0064] The middle connecting ear 222 at one end of the first middle tube 22 of the two adjacent middle tubes is inserted into the inner hole of the second middle tube 22, and the middle rotating shaft hook 224 on the middle connecting ear 222 is installed in the middle shaft hole 223 of the second middle tube 22 and rotated to fit.

[0065] Since the two-way snake bones in the existing technology are connected in series with each node of the snake bone through two traction wire ropes, each traction wire rope must be reserved for a process length before assembly, and the traction wire rope with the excess process length must be built after the assembly and fixation. This has the disadvantages of not only taking a long time to assemble the wire ropes, but also requiring a high level of manual assembly effort, and at the same time, resulting in high material costs for the wire ropes and low production efficiency.

[0066] In order to overcome the above defects, Figure 4 、 5 As shown in , 7, Example 1 also includes a steel wire rope 25. At the same time, two middle rope holes 221 symmetrically arranged along the tube wall of each middle tube 22 in the snake bone are provided. The front tube 21 is provided with a steel wire rope positioning groove 211, and the steel wire rope positioning groove 211 is provided with two front rope holes corresponding to the middle rope hole 221 of the middle tube 22. Part of the traction steel wire rope 25 is embedded in the steel wire rope positioning groove 211, and the two ends of the traction steel wire rope 25 respectively pass through the corresponding front rope holes on the front tube 21 and the middle rope hole 221 of each middle tube 22 and pass through the rear tube 23 and the front joint 5 of the insertion tube. The advantage of this design is that the present invention can achieve bending in two directions by passing a traction wire rope through the snake bone, replacing the technical solution of achieving bending in two directions with two traction wire ropes in the existing technology. There is no need to reserve or build extra process length, which will not cause waste of wire rope materials and reduce the material cost of the wire rope. At the same time, it reduces the assembly strength, saves assembly time, and improves production efficiency.

[0067] Furthermore, the wire rope positioning groove 211 is formed into an annular R groove by rolling using a special rotary rolling R cutter. Compared with the lathe forming method in the prior art, the present invention has the advantages of low processing cost and high production efficiency.

[0068] Further, such as Figure 3 、 8 As shown, in order to facilitate the matching of the rotating shaft hook of the snake bone with the corresponding shaft hole and the assembly, the middle connecting ear 222 at one end of the middle tube 22 in the curved snake bone 2 has a semicircular through hole and an intermediate spring piece 225 formed by wire cutting. The intermediate shaft hole 223 is a closed circular shaft hole formed by the semicircular through hole and the semicircular through hole provided on the intermediate spring piece 225.

[0069] The rear connecting ear 232 of the rear section tube 23 has a semicircular through hole and a rear spring piece 234 formed by wire cutting. The front shaft hole 233 is a closed circular shaft hole formed by the semicircular through hole and the semicircular through hole provided on the rear spring piece 234.

[0070] Further, such as Figure 2 As shown, to prevent the spring sheet from deforming when the snake-bone corner is subjected to force, and to prevent the rotating shaft hook from moving within the shaft hole, several elastic fixing rings 24 are included. An elastic fixing ring is provided on the outer periphery of the rear connecting ear 232 of the rear segment tube 23, near the front shaft hole 233, to prevent the intermediate rotating shaft hook connected thereto from moving. An elastic fixing ring is also provided on the outer periphery of the intermediate connecting ear 222 at one end of each intermediate segment tube 22, near the intermediate shaft hole 223, to prevent the rear rotating shaft hook or intermediate rotating shaft hook connected thereto from moving. After the different segment tubes are assembled, the elastic fixing rings of the present invention are crimped onto the spring sheet locations. This prevents the spring sheet from deforming when the snake-bone corner is subjected to force.

[0071] Furthermore, in order to prevent the elastic fixing ring from rotating circumferentially, as Figure 9 As shown, the elastic fixing ring 24 is provided with positioning grooves 241 which are symmetrically arranged along the elastic fixing ring and are used to position the corresponding rear connecting ears or middle connecting ears.

[0072] Furthermore, in order to ensure that the positioning groove of the elastic fixing ring can be precisely matched with the corresponding connecting ear, the width of the positioning groove 241 is equal to the width of the corresponding rear connecting ear or the middle connecting ear.

[0073] Furthermore, the elastic retaining ring 24 of the present invention can be a closed loop structure or a structure with a shrinking notch. If it is a closed loop structure, during assembly, it is pre-placed around the outer periphery of the connecting ring and in an expanded state. It is then moved to the outer periphery of the corresponding connecting lug and retracted by its own elasticity. If it is a structure with a shrinking notch, it can be expanded and clamped to the outer periphery of the corresponding connecting lug from one side of the connecting lug using the shrinking notch.

[0074] Furthermore, in order to increase the stability and strength of the elastic fixing ring position, the connection between the rear section tube 23 and the middle section tube 22 and the corresponding elastic fixing ring is also fixed by glue dispensing.

[0075] Further, such as Figure 1 、 2 As shown in Figures 3 and 5, in order to form a connection with the camera holder with high positioning accuracy and replace the adhesive bonding method with the camera holder in the existing technology, two to four tapered holes 215 are provided on the peripheral wall of the front section tube 21 to form a matching connection with the camera holder 1 through countersunk screws.

[0076] Further, such as Figure 1 As shown, in order to improve the overall sealing of the assembly, the sealing hose 4 is provided with tying wires 6 at both ends of the outer periphery and at the camera seat 1 and the front joint 5 of the insertion tube, and the sealing hose 4 is also provided with sealant for improving the overall sealing at the locations where the tying wires are provided.

[0077] Furthermore, the sealing hose 4 of the present invention is a rubber-plastic hose, that is, the rubber-plastic hose can be a hose made of rubber or a hose made of polyurethane.

[0078] Example 2

[0079] The difference between Example 2 and Example 1 is that: Figure 10 、 11 , 12, 13, 14, 15, 16, and 17 show a bending portion assembly of a flexible endoscope, comprising a camera seat 1, a bending serpentine 2, a braided mesh tube 3, a sealing hose 4, and an insertion tube front joint 5. The camera seat 1 and the insertion tube front joint 5 are respectively arranged at the front end and the rear end of the bending serpentine 2, the braided mesh tube 3 is arranged at the periphery of the bending serpentine 2, and the sealing hose 2 is arranged at the braided mesh tube 3, the insertion tube front joint 5, and a partial periphery of the camera seat 1 to form a sealed connection.

[0080] The curved snake bone in Example 2 is a four-directional snake bone. The curved snake bone 2 includes a front tube 21 and a rear tube 23, and a curved body composed of several middle tubes 22 arranged between the front tube and the rear tube. The camera seat 1 is connected to the front tube 21, and the front joint 5 of the insertion tube is connected to the rear tube 23.

[0081] A pair of symmetrically arranged front connecting ears 212 are extended from one end of the front section tube 21 along its axial direction. The front connecting ears 212 have rear rotating shaft hooks 213 arranged perpendicularly thereto.

[0082] A pair of symmetrically arranged intermediate connecting ears 222 are extended from both ends of the middle tube 22. The intermediate connecting ears 222 at both ends of the middle tube 22 have a 90° phase difference, and one of the intermediate connecting ears 222 is provided with an intermediate shaft hole 223, and the other intermediate connecting ear 222 is provided with an intermediate rotating shaft hook 224 arranged perpendicularly thereto.

[0083] A pair of symmetrically arranged rear connecting ears 232 are extended from one end of the rear section tube 23 along its axial direction. The rear connecting ears 232 have a front shaft hole 233.

[0084] The front connecting ear 212 of the front section tube 21 is inserted into the inner hole of the adjacent middle section tube 22, and the rear rotating shaft hook 213 is installed in the middle shaft hole 223 of the middle section tube 22 and rotated to fit.

[0085] The middle connecting ear 222 at one end of the middle section tube 22 adjacent to the rear section tube 23 is inserted into the inner hole of the rear section tube 23, and the middle rotating shaft hook 224 of the middle section tube 22 is installed in the front shaft hole 233 of the rear section tube 23 and rotated to fit.

[0086] The rear middle section tube of the two adjacent middle section tubes is rotated 90° and then connected to the front middle section tube. At the same time, the middle connecting ear 222 at one end of the front middle section tube 22 is inserted into the inner hole of the rear middle section tube 22, and the middle rotating shaft hook 224 on the middle connecting ear 222 is installed in the middle shaft hole 223 of the rear middle section tube 22.

[0087] Further, such as Figure 10 As shown, in order to realize the four-way bending of the snake bone, four traction steel ropes 25 are also included. At the same time, four evenly arranged front rope holes 210 are provided on the peripheral wall of the front segment tube 21 in the snake bone and along its circumferential direction, and four evenly arranged middle rope holes 221 are provided on the peripheral wall of each middle segment tube 22 and along its circumferential direction, and the middle rope holes 221 correspond to the front rope holes 210 one by one. One end of the four traction steel ropes 25 is respectively fixed to the front rope holes 210 corresponding to the front segment tube 21, and passes through the middle rope holes 221 corresponding to the middle segment tube 22 in turn, and passes through the rear segment tube 23 and the front joint 5 of the insertion tube.

[0088] The other structures of Example 2 are exactly the same as those of Example 1.

[0089] The curved snake bone 2 of the present invention is a two-way snake bone or a four-way snake bone. Regardless of the structure of the snake bone, adjacent segment tubes are connected by a structure formed by the corresponding rotating shaft hooks and shaft holes. In this way, the finally assembled snake bone is not only well positioned and highly accurate, but also flexible in rotation and has a low production cost.

[0090] The rotating shaft hook and the corresponding shaft hole of the present invention are directly inserted into the assembly structure and matched without clearance, so that the positioning reference is good. At the same time, it is a force-free assembly. The snake bone corner rotates slowly during use, which is also a force-free assembly, so it is flexible to rotate. Unlike the rivet-type snake bone in the existing technology, the tight riveting will cause large rotation resistance of the snake bone corner.

[0091] The matching structure of the rotating shaft hook and the shaft hole of the present invention adopts a six-point positioning method, which not only has many positioning points, making the positioning reliable, but also has reliable bending angles.

[0092] The bending serpentine of the present invention is controlled by a traction steel wire rope when achieving bending in two directions, replacing the technical solution of two traction steel wire ropes in the existing technology to achieve bending in two directions. There is no need to reserve or build extra process length, which will not cause waste of steel wire rope materials, reducing the material cost of the steel wire rope. At the same time, it reduces the assembly strength, saves assembly time, and improves production efficiency.

[0093] The front segment tube of the curved snake bone of the present invention is connected to the camera seat 1 with high positioning accuracy through a countersunk screw, thereby replacing the adhesive bonding method with the camera seat in the prior art.

[0094] The outermost sealing hose of the bending part assembly of the present invention is also wrapped with tying wires at both ends, and glue is applied to this part to further improve the sealing effect. At the same time, the surface of the tying wire is smooth and free of burrs, ensuring that the inner cavity of the subject will not be damaged.

[0095] In summary, the present invention not only has a simple production process, but also has a reasonable structure, stable product quality, and good sealing. At the same time, it also has the advantages of easy processing, high bending positioning accuracy, flexible rotation, and more reliable bending corners.

[0096] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A bending portion assembly of a flexible endoscope, comprising a camera seat (1), a bending serpentine (2), a braided mesh tube (3), a sealing hose (4) and an insertion tube front joint (5), wherein the camera seat (1) and the insertion tube front joint (5) are respectively arranged at the front end and the rear end of the bending serpentine (2), the braided mesh tube (3) is arranged at the outer periphery of the bending serpentine (2), and the sealing hose (4) is arranged at the outer periphery of the braided mesh tube (3), the insertion tube front joint (5) and a portion of the camera seat (1) to form a sealed connection. The curved snake bone (2) includes a front tube (21) and a rear tube (23), and a curved body composed of a plurality of middle tubes (22) arranged between the front tube and the rear tube. The camera seat (1) is connected to the front tube (21), and the insertion tube front joint (5) is connected to the rear tube (23). Its characteristics are: The curved snake bone (2) is any one of the following two structures: The first type is a pair of symmetrically arranged front connecting ears (212) extending from one end of the front section tube (21) along its axial direction, and a rear rotating shaft hook (213) arranged perpendicularly thereto is provided on the front connecting ear (212). A pair of symmetrically arranged intermediate connecting ears (222) are respectively extended from both ends of the middle section tube (22), and an intermediate shaft hole (223) is provided on the intermediate connecting ear (222) at one end, and an intermediate rotating shaft hook (224) arranged perpendicularly thereto is provided on the intermediate connecting ear (222) at the other end. A pair of symmetrically arranged rear connecting ears (232) are extended from the end of one end of the rear section tube (23) along the axial direction thereof, and the rear connecting ears (232) have a front axle hole (233). The front connecting ear (212) of the front tube (21) is inserted into the inner hole of the adjacent middle tube (22), and the rear rotating shaft hook (213) is installed in the middle shaft hole (223) of the middle tube (22) and rotated to fit. The middle connecting ear (222) at one end of the middle section tube (22) adjacent to the rear section tube (23) is inserted into the inner hole of the rear section tube (23), and the middle rotating shaft hook (224) of the middle section tube (22) is installed in the front shaft hole (233) of the rear section tube (23) and rotated to fit. The middle connecting ear (222) at one end of the first middle section tube (22) of the two adjacent middle section tubes is inserted into the inner hole of the second middle section tube (22), and the middle rotating shaft hook (224) on the middle connecting ear (222) is installed in the middle shaft hole (223) of the second middle section tube (22) and rotated to fit; The second type is that a pair of symmetrically arranged front connecting ears (212) are extended from the end of one end of the front section tube (21) along the axial direction thereof, and the front connecting ears (212) have rear rotating shaft hooks (213) arranged perpendicular thereto. A pair of symmetrically arranged intermediate connecting ears (222) are respectively extended from both ends of the intermediate tube (22), and the intermediate connecting ears (222) at both ends of the intermediate tube (22) have a 90° phase difference, and one of the intermediate connecting ears (222) is provided with an intermediate shaft hole (223), and the other intermediate connecting ear (222) is provided with an intermediate rotating shaft hook (224) arranged perpendicularly thereto. A pair of symmetrically arranged rear connecting ears (232) are extended from the end of one end of the rear section tube (23) along the axial direction thereof, and the rear connecting ears (232) have a front axle hole (233). The front connecting ear (212) of the front tube (21) is inserted into the inner hole of the adjacent middle tube (22), and the rear rotating shaft hook (213) is installed in the middle shaft hole (223) of the middle tube (22) and rotated to fit. The middle connecting ear (222) at one end of the middle section tube (22) adjacent to the rear section tube (23) is inserted into the inner hole of the rear section tube (23), and the middle rotating shaft hook (224) of the middle section tube (22) is installed in the front shaft hole (233) of the rear section tube (23) and rotated to fit. The rear middle section tube of the two adjacent middle section tubes is rotated 90 degrees and then connected to the front middle section tube. At the same time, the middle connecting ear (222) at one end of the front middle section tube (22) is inserted into the inner hole of the rear middle section tube (22). At the same time, the middle rotating shaft hook (224) on the middle connecting ear (222) is installed in the middle shaft hole (223) of the rear middle section tube (22).

2. The bending portion assembly of a flexible endoscope according to claim 1, wherein: The first type of curved serpentine is a two-way serpentine, and the two-way serpentine also includes a steel wire rope (25). At the same time, the wall of each middle section tube (22) in the serpentine is provided with two middle rope holes (221) arranged symmetrically along the tube wall. The front section tube (21) is provided with a steel wire rope positioning groove (211), and the steel wire rope positioning groove (211) is provided with two front rope holes corresponding to the middle rope holes (221) of the middle section tube (22). Part of the traction steel wire rope (25) is embedded in the steel wire rope positioning groove (211), and the two ends of the traction steel wire rope (25) respectively pass through the corresponding front rope holes on the front section tube (21) and the middle rope holes (221) of each middle section tube (22) and pass out through the rear section tube (23) and the front joint (5) of the insertion tube.

3. The bending portion assembly of a flexible endoscope according to claim 1, wherein: The second type of curved snake bone is a four-directional snake bone, and the four-directional snake bone also includes four traction steel wires (25). At the same time, four evenly arranged front rope holes (210) are provided on the peripheral wall of the front segment tube (21) and along its circumferential direction, and four evenly arranged middle rope holes (221) are provided on the peripheral wall of each middle segment tube (22) and along its circumferential direction, and the middle rope holes (221) correspond to the front rope holes (210) one by one. One end of the four traction steel wires (25) is respectively fixed to the corresponding front rope holes (210) of the front segment tube (21), and passes through the corresponding middle rope holes (221) of the middle segment tube (22) in sequence, and passes through the rear segment tube (23) and the front joint (5) of the insertion tube.

4. The bending portion assembly of a flexible endoscope according to claim 1, wherein: The intermediate connecting ear (222) at one end of the middle tube (22) in any one of the curved snake bones (2) has a semicircular through hole and an intermediate spring piece (225) formed by wire cutting, and the intermediate shaft hole (223) is a closed circular shaft hole formed by the semicircular through hole and the semicircular through hole provided on the intermediate spring piece (225). The rear connecting ear (232) of the rear section tube (23) is provided with a semicircular through hole and a rear spring piece (234) formed by wire cutting, and the front shaft hole (233) is a closed circular shaft hole formed by the semicircular through hole and the semicircular through hole provided on the rear spring piece (234).

5. The bending portion assembly of a flexible endoscope according to claim 1 or 4, characterized in that: Any of the curved snake bones (2) further comprises a plurality of elastic fixing rings (24), wherein an elastic fixing ring is provided on the periphery of the rear connecting ear (232) of the rear section tube (23) and near the front shaft hole (233) to prevent the intermediate rotating shaft hook connected thereto from moving, and an elastic fixing ring is provided on the periphery of the intermediate connecting ear (222) at one end of each intermediate section tube (22) and near the intermediate shaft hole (223) to prevent the rear rotating shaft hook or the intermediate rotating shaft hook connected thereto from moving.

6. The bending portion assembly of a flexible endoscope according to claim 5, wherein: The elastic fixing ring (24) is provided with positioning grooves (241) arranged symmetrically along the elastic fixing ring and used to position the corresponding rear connecting ear or middle connecting ear, and the width of the positioning grooves (241) is equal to the width of the corresponding rear connecting ear or middle connecting ear.

7. The bending portion assembly of a flexible endoscope according to claim 5, wherein: The elastic fixing ring (24) is a closed ring structure or a structure with a shrinkage notch.

8. The bending portion assembly of a flexible endoscope according to claim 5, wherein: The connection between the rear section tube (23) and the middle section tube (22) and the corresponding elastic fixing rings is also fixed by glue dispensing.

9. The bending portion assembly of a flexible endoscope according to claim 1, wherein: Two to four tapered holes (215) are provided on the peripheral wall of the front segment tube (21) in any one of the curved snake bones (2) and are connected to the camera seat (1) through countersunk screws.

10. The bending portion assembly of a flexible endoscope according to claim 1, wherein: Tie wires (6) are respectively provided on the outer periphery of both ends of the sealing hose (4) and at the camera seat (1) and the front joint (5) of the insertion tube, and sealant for improving the overall sealing performance is also provided at the locations where the tie wires are provided on the outer periphery of the sealing hose (4).

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