Bending part assembly of soft endoscope

Abstract

The invention relates to a bending part assembly of a flexible endoscope, which comprises a camera seat, a bending snake bone, a woven mesh pipe, a sealing hose and an insertion pipe front joint, the camera seat and the insertion pipe front joint are respectively arranged at the front end and the tail part of the bending snake bone, the woven mesh pipe is arranged at the periphery of the bending snake bone, and the sealing hose is arranged at the tail part of the bending snake bone. And the sealing hose is arranged on the peripheries of partial sections of the woven mesh pipe, the insertion pipe front joint and the camera seat and forms sealing connection, and the innovation points are as follows: the connecting lug of the front section pipe of the bent snake bone is provided with a corresponding rotating shaft hook, and the connecting lug at one end of the middle section pipe is provided with a corresponding shaft hole; the connecting lug at the other end is provided with a corresponding rotating shaft hook, the connecting lug of the rear section pipe is provided with a corresponding shaft hole, and the front section pipe, the middle section pipe and the rear section pipe are connected into a whole through the corresponding rotating shaft hook and shaft hole matching structure. The angle bending device is easy to machine, high in bending positioning precision and flexible in rotation, so that angle bending is more reliable.

Description

Technical Field

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

[0002] At present, medical flexible endoscope series products at home and abroad are mainly used for the inspection, diagnosis and minimally invasive treatment of the inner cavity of the human digestive system, human respiratory system, urinary system, ear cavity, nose and throat, etc. Among them, the curved snake bone in the curved part assembly is one of the main accessories of medical flexible endoscope series products or industrial flexible endoscopes.

[0003] The snake bones in the prior art include rivet structure snake bones or expansion structure snake bones. Among them, the rivet structure snake bones are prone to bending and deformation of the rivet shaft during riveting due to the abnormal adjustment of the stamping machine and the installation and correction of the riveting die, resulting in the inflexible rotation of the snake bones and low yield rate; and the rivet head is too small, causing the rivet head to fall off, etc., and the bending part of the endoscope is prone to use failures during use, or the endoscope cannot be used, etc. The various nodes in the snake bones of the expansion structure rely on the connection structure composed of a boss and a boss groove or a connection structure composed of a ball head and a ball socket to connect as a whole, but since there are only three positioning points after the boss and the boss groove are in contact, the bending angle of the snake bones will be offset, and there is a disadvantage of poor accuracy. Although the connection structure composed of a ball head and a ball socket can ensure that different nodes can rotate flexibly, the rotation friction area is large, and this connection structure is five-point positioning, and there is also a relatively low positioning accuracy. Summary of the invention

[0004] The object of the present invention is to provide a bending portion assembly of 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 purpose, the technical scheme of the present invention is: a bending part assembly of a flexible endoscope, comprising a camera seat, a bending snake bone, a braided mesh tube, a sealing hose and an insertion tube front joint, wherein the camera seat and the insertion tube front joint are respectively arranged at the front end and the tail end of the bending snake bone, the braided mesh tube is arranged at the periphery of the bending snake bone, and the sealing hose is arranged at the braided mesh tube, the insertion tube front joint and the periphery of a part 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 disposed 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 rear rotating shaft hooks arranged perpendicularly thereto.

[0009] A pair of symmetrically arranged middle connecting ears are respectively extended from both ends of the middle section pipe, 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 axial hole.

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

[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 the axial direction thereof, and the front connecting ears have rear rotating shaft hooks arranged perpendicularly thereto.

[0015] A pair of symmetrically arranged middle connecting ears are respectively extended from both ends of the middle tube. The middle connecting ears at both ends of the middle tube have a 90° phase difference, and one of the middle connecting ears is provided with a middle shaft hole, and the other middle connecting ear is provided with a middle rotating shaft hook arranged perpendicularly thereto.

[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 axial hole.

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

[0019] The rear middle section tube of two adjacent middle section tubes is rotated 90 degrees and then connected with 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 in the middle shaft hole of the rear middle section tube.

[0020] In the above technical scheme, the first curved snake bone is a two-way snake bone, and the two-way snake bone also includes a steel wire rope. At the same time, the tube wall of each middle section tube in the snake bone is provided with two middle rope threading 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 threading holes corresponding to the middle rope threading 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 threading hole on the front section tube and the middle rope threading 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 scheme, 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 threading holes are provided on the circumferential wall of the front section tube in the snake bone and along its circumferential direction, and four evenly arranged middle rope threading holes are provided on the circumferential wall of each middle section tube and along its circumferential direction, and the middle rope threading holes correspond to the front rope threading holes one by one, one ends of the four traction steel ropes are respectively fixed to the front rope threading holes corresponding to the front section tube, and pass through the middle rope threading holes corresponding to the middle section tube in turn, and pass through the rear section tube and the front joint of 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 a middle spring piece formed by wire cutting, and the middle shaft hole is a closed circular shaft hole formed by the semicircular through hole and the semicircular through hole provided on the middle 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 scheme, any one of the curved snake bones also includes a plurality of elastic fixing rings, and 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 thereto 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 intermediate axle hole to prevent the rear rotating shaft hook or the intermediate rotating shaft hook connected thereto from moving.

[0025] In the above technical solution, the elastic fixing ring is provided with positioning grooves which are 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 and connected with the camera seat through countersunk screws.

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

[0030] The positive effect of the present invention is that after the bending part assembly of the soft endoscope of the present invention is adopted, a pair of symmetrically arranged front connecting ears are extended along the axial direction of the end of the front segment tube in 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 respectively extended from both ends of the middle section pipe, 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 axial hole.

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

[0036] The bent snake bone of the present invention has two structures. The other structure is different from the above structure in that the latter middle section tube of two adjacent middle section tubes is connected to the former middle section tube after rotating 90 degrees.

[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 the rotation between the various connecting rings is more flexible and precise, and the production cost is low. At the same time, the connection between adjacent connecting rings of the present invention adopts the 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 implementation mode 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 A top view schematic diagram 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-front 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 section tube;

[0046] Fig. 9 yes Figure 2 A schematic diagram of the structure of the middle elastic fixing ring;

[0047] Fig.10 It is a structural schematic diagram of a second specific implementation mode of the present invention;

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

[0049] Fig.12 yes Fig.11 A top view schematic diagram of

[0050] Fig.13 yes Fig.11 Schematic diagram of the structure of the mid-front tube;

[0051] Fig.14 yes Fig.13 The left view of

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

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

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

[0055] The present invention is further described below with reference to the accompanying drawings and given embodiments, but 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 bone 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 tail end of the bending serpentine bone 2, the braided mesh tube 3 is arranged at the periphery of the bending serpentine bone 2, and the sealing hose 4 is arranged at the braided mesh tube 3, the insertion tube front joint 5, and the outer periphery of a portion of the camera seat 1 to form a sealed connection.

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

[0059] 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 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 respectively 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 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 shaft hole 233.

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

[0065] Since the two-way snake bones in the prior art are connected in series with each node ring of the snake bones through two traction wire ropes, a process length must be reserved for each traction wire rope before assembly, and the traction wire rope with excess process length must be built after assembly and fixation. This has the disadvantages of not only taking a long time to assemble the wire ropes, but also requiring great strength in manual assembly. At the same time, the material cost of the wire ropes is high, and the production efficiency is low.

[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, the tube wall of each middle section tube 22 in the snake bone is provided with two middle rope threading holes 221 arranged symmetrically along it, 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 threading holes corresponding to the middle rope threading hole 221 of the middle section tube 22, a 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 threading hole on the front section tube 21 and the middle rope threading hole 221 of each middle section tube 22 and pass through the rear section tube 23 and the front joint 5 of the insertion tube. The advantage of such a design is that the present invention can achieve bending in two directions by passing a traction steel wire rope through the snake bone, replacing the technical solution of achieving bending in two directions with two traction steel wire ropes in the prior art. There is no need to reserve or build extra process length, which will not cause waste of steel wire rope materials, thus 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.

[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 machining process 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 and assembly of the rotating shaft hook of the snake bone with the corresponding shaft hole, 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, 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.

[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, in order to prevent the spring piece from deforming when the snake bone corner is stressed and to prevent the rotating shaft hook from moving in the shaft hole, a plurality of elastic fixing rings 24 are also included. 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. An elastic fixing ring is provided on the periphery of the intermediate connecting ear 222 at one end of each middle 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. After the different section tubes are assembled, the elastic fixing ring of the present invention is crimped at the position of the spring piece, so that when the snake bone corner is stressed, the spring piece will not deform.

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

[0072] Furthermore, in order to enable the positioning groove of the elastic fixing ring to achieve precise matching 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 fixing ring 24 of the present invention is a closed loop structure or a structure with a shrinkage notch. If it is a closed loop (closed) structure, during the assembly process, it is pre-sleeved on the outer periphery of the connecting ring and is in an expanded state, moved to the outer periphery of the corresponding connecting ear, and is clamped on the outer periphery of the connecting ear by its own elastic reset. If it is a structure with a shrinkage notch, it can be expanded and clamped on the outer periphery of the corresponding connecting ear from one side of the connecting ear by using the shrinkage notch.

[0074] Furthermore, in order to increase the stability and strength of the position of the elastic fixing ring, the connection between the rear section pipe 23 and the middle section pipe 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 to replace the adhesive bonding method with the camera holder in the prior art, the peripheral wall of the front section tube 21 is provided with two to four tapered holes 215 which are matched 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, wire ties 6 are provided at 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, respectively, and the parts of the outer periphery of the sealing hose 4 where the wire ties are provided are also provided with sealant for improving the overall sealing.

[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: Fig.10 , 11 , 12, 13, 14, 15, 16, 17, a bending part assembly of a flexible endoscope, comprising a camera seat 1, a bending snake bone 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 tail end of the bending snake bone 2, the braided mesh tube 3 is arranged at the periphery of the bending snake bone 2, and the sealing hose 2 is arranged at the braided mesh tube 3, the insertion tube front joint 5 and the outer periphery of a part 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 segment tube 21 and a rear segment tube 23, and a curved body composed of a plurality of middle segment tubes 22 disposed between the front segment tube and the rear segment tube. The camera seat 1 is connected to the front segment tube 21, and the insertion tube front joint 5 is connected to the rear segment tube 23.

[0081] 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 perpendicularly thereto.

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

[0083] 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 shaft hole 233.

[0084] The front connecting ear 212 of the front tube section 21 is inserted into the inner hole of the middle tube section 22 adjacent thereto, and the rear rotating shaft hook 213 is installed in the middle shaft hole 223 of the middle tube section 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 Fig.10 As shown, in order to realize the four-way bending of the snake bone, four traction steel wires 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 ends of the four traction steel wires 25 are respectively fixed to the front rope holes 210 corresponding to the front segment tube 21, and pass through the middle rope holes 221 corresponding to the middle segment tube 22 in turn, and pass 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 hook and shaft hole. In this way, the finally assembled snake bone is not only well positioned and has high precision, but also flexible in rotation and has 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 prior art, the tight riveting will cause large rotation resistance of the snake bone corner.

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

[0092] The bending snake bone of the present invention is controlled by a traction steel wire rope when realizing bending in two directions, replacing the technical solution of realizing bending in two directions by two traction steel wire ropes in the prior art. There is no need to reserve or build extra process length, no waste of steel wire rope materials, and the material cost of the steel wire rope is reduced. At the same time, the assembly strength is reduced, the assembly time is saved, and the production efficiency is improved.

[0093] The front segment tube of the curved snake bone of the present invention is connected with 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 two ends of the outermost sealing hose of the bending part assembly of the present invention are also wrapped with wire ties, and glue is applied to this part to further improve the sealing effect. At the same time, the surface of the wire ties can be ensured to be 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, good sealing performance, and at the same time, it also has the advantages of easy processing, high bending positioning accuracy, flexible rotation, making the bending angle more reliable, etc.

[0096] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bending part assembly of a flexible endoscope, comprising a camera seat (1), a bending snake bone (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 snake bone (2), the braided mesh tube (3) is arranged at the outer periphery of the bending snake bone (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 part of the camera seat (1) to form a sealed connection, The curved snake bone (2) comprises 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). Features: The curved snake bone (2) is any one of the following two structures: The first 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 a rear rotating shaft hook (213) arranged perpendicularly thereto is provided on the front connecting ear (212). A pair of symmetrically arranged middle connecting ears (222) are respectively 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. 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 shaft hole (233). The front connecting ear (212) of the front tube section (21) is inserted into the inner hole of the middle tube section (22) adjacent thereto, and the rear rotating shaft hook (213) is installed in the middle shaft hole (223) of the middle tube section (22) and rotated to fit. The middle connecting ear (222) at one end of the middle tube (22) adjacent to the rear tube (23) is inserted into the inner hole of the rear tube (23), and the middle rotating shaft hook (224) of the middle tube (22) is installed in the front shaft hole (233) of the rear 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 perpendicularly thereto. A pair of symmetrically arranged middle connecting ears (222) are respectively extended from both ends of the middle tube (22), the middle connecting ears (222) at both ends of the middle tube (22) have a phase difference of 90 degrees, one of the middle connecting ears (222) is provided with a middle shaft hole (223), and the other middle connecting ear (222) is provided with a middle 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 shaft hole (233). The front connecting ear (212) of the front tube section (21) is inserted into the inner hole of the middle tube section (22) adjacent thereto, and the rear rotating shaft hook (213) is installed in the middle shaft hole (223) of the middle tube section (22) and rotated to fit. The middle connecting ear (222) at one end of the middle tube (22) adjacent to the rear tube (23) is inserted into the inner hole of the rear tube (23), and the middle rotating shaft hook (224) of the middle tube (22) is installed in the front shaft hole (233) of the rear 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 with 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).

2. The bending portion assembly of a flexible endoscope according to claim 1, characterized in that: The first type of curved snake bone is a two-way snake bone, and the two-way snake bone also includes a steel wire rope (25). At the same time, the tube wall of each middle section tube (22) in the snake bone is provided with two middle rope threading holes (221) arranged symmetrically along it, 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 threading holes corresponding to the middle rope threading hole (221) of the middle section tube (22), a 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 threading hole on the front section tube (21) and the middle rope threading hole (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, characterized in that: 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) are respectively fixed to the corresponding front rope holes (210) of the front segment tube (21), and pass through the corresponding middle rope holes (221) of the middle segment tube (22) in sequence, and pass 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, characterized in that: The middle 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 a middle spring piece (225) formed by wire cutting, and the middle shaft hole (223) is a closed circular shaft hole formed by the semicircular through hole and the semicircular through hole provided on the middle spring piece (225). The rear connecting ear (232) of the rear tube section (23) is provided with a semicircular through hole and a rear spring plate (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 plate (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, characterized in that: 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 ear or the middle connecting ear, and the width of the positioning grooves (241) is equal to the width of the corresponding rear connecting ear or the middle connecting ear.

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

8. The bending portion assembly of a flexible endoscope according to claim 5, characterized in that: 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, characterized in that: The peripheral wall of the front segment tube (21) in any one of the curved snake bones (2) is provided with two to four tapered holes (215) which are matched and connected with the camera seat (1) through countersunk screws.

10. The bending portion assembly of a flexible endoscope according to claim 1, characterized in that: Tie wires (6) are respectively provided at 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 at the outer periphery of the sealing hose (4).

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