CN211985343U - Snake bone assembly for controlling bending angle of endoscope - Google Patents

Abstract

The utility model discloses a snake bone component for controlling the bending angle of an endoscope, which comprises a plurality of snake bone middle sections which are connected in sequence; the end surface between the connecting lugs at one end of the middle snake bone section forms a lateral inclined surface, the lateral inclined surface and the axial direction of the middle snake bone section form a rotation included angle, and the rotation included angle and the maximum bending angle of the adjacent middle snake bone section form a complementary angle relationship; a plurality of containing grooves extending along the axial direction are distributed on the side wall of the inner hole of the middle section of the snake bone along the circumferential direction. The utility model discloses a plurality of storage tanks that are used for placing the functional line are seted up to the inner wall at the snake bone subassembly, because the opening width of storage tank in the condyle hole is less than the diameter of storage tank, the functional line of placing in the groove etc. are difficult to leave the storage tank when the crooked operation of snake bone subassembly and get into the condyle hole and produce winding phenomenon with pincers pipe, thereby solved each tubular product of snake bone subassembly inner space, the wire rod, leaded light fiber influences the problem of operating performance because of the winding, the production of trouble has been avoided.

Description

Snake bone assembly for controlling bending angle of endoscope

Technical Field

The utility model relates to a medical instrument, concretely relates to snake bone subassembly for controlling endoscope bending angle.

Background

According to the traditional reusable endoscope, the snake bone sections of the bent snake bone components of the endoscope are usually manufactured by adopting metal thin-wall pipes through a laser or wire cutting process, and the connection between the snake bone sections is fixed through riveting and wire-through hole elements through rivet welding. In order to save cost, the disposable endoscope is usually made of plastic materials through an injection molding process or a thin-wall stainless steel tube through an integral laser cutting process. The snake bone joint made of plastic is adopted, and in order to keep enough hardness, not only hard materials are required to be adopted for injection molding, but also a certain thickness is required to be kept; in the process of medical operation, the problem that the joints between the snake bone joints are loosened due to the action of certain external force often occurs to the snake bone component which is made of the thin-wall stainless steel tube through the integral laser cutting process.

In contrast, the snake bone component made of plastic materials is superior to the snake bone component manufactured by a laser cutting process in connection reliability, but has the problem of wall thickness. The steel wire rope threading hole of the snake bone component made of plastic materials is usually positioned in the middle of a wall thickness layer between the inner diameter and the outer diameter of the snake bone, so that the manufacturing process that a metal snake bone joint needs to be riveted or welded with a rope threading hole ring is omitted. In addition, the snake bone section hinge connection structure made of plastic adopts a mode that the rotating shaft is inserted into the shaft sleeve, and the snake bone section is made of plastic, so that the snake bone section hinge connection structure is tough after injection molding, and the snake bone section hinge connection structure is very easy to connect and install. The two points are the advantages of injection molding of the snake bone by adopting a plastic material. The snake bone component made of plastic material used by the endoscope has the advantages of good economy and high cost performance.

Generally, for medical endoscopes, it is required that an instrument whose bending portion passes through a biopsy forceps channel (working channel) when bending can maintain smooth and smooth operability to perform a specific biopsy or treatment work. Therefore, the bending control snake bone component of the medical endoscope is required to have good bending form so as to ensure that the biopsy forceps channel (working channel) in the snake bone component has good moving space and smoothness and good bending form, so that the biopsy forceps channel (working channel) does not bend, and the smoothness and smoothness of the instrument during use are ensured.

In addition, the inner space of the snake bone component is used for passing through a signal cable, a light guide glass fiber bundle, a clamping pipe, a water vapor pipe and the like. The snake bone assembly is bent repeatedly for multiple times, and the phenomenon of mutual winding can occur, so that the internal space of the snake bone assembly is reduced, the bending operation is difficult or the bending angle is insufficient, and the fault of twisting off of a fine cable in the small-diameter endoscope can be caused in serious conditions.

Medical endoscopes often need to be enlarged as much as possible while maintaining a small diameter of the insertion tube in order to grasp larger tissues with larger-sized biopsy forceps, thereby providing a reliable basis for cytological and pathological diagnosis. Therefore, for the snake bone component made of plastic, the contradiction between the diameter of the biopsy forceps working channel pipe and the wall thickness of the snake bone component made of plastic, and the phenomena that the signal cable, the light guide glass fiber bundle, the forceps channel pipe and the water vapor pipe are different in material and hardness, and are mutually wound after the snake bone component is repeatedly bent for many times need to be solved. This is particularly important in endoscopes having a small outer diameter of 6mm or less.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a snake bone subassembly for controlling endoscope bend angle is provided, it can avoid inside tubular product of snake bone subassembly, wire rod to influence operating performance's problem because of the winding.

In order to solve the technical problem, the utility model discloses a technical solution for controlling endoscope bend angle's snake bone subassembly does:

comprises a plurality of snake bone middle sections which are connected in sequence; the end surface between the connecting lugs at one end of the middle snake bone section forms a lateral inclined surface, the lateral inclined surface and the axial direction of the middle snake bone section form a rotation included angle, and the rotation included angle and the maximum bending angle of the adjacent middle snake bone section form a complementary angle relationship; a plurality of containing grooves extending along the axial direction are distributed on the side wall of the inner hole of the middle section of the snake bone along the circumferential direction.

In another embodiment, the diameter of the accommodating groove is matched with the diameter of the functional wire to be accommodated.

In another embodiment, the width of the opening of the receiving groove in the inner hole of the condyle is smaller than the diameter of the receiving groove.

In another embodiment, the inner wall of the end surface of the middle section of the snake bone is formed with an inner chamfer.

In another embodiment, the angle of the inner chamfer is proportional to the maximum bending angle of the adjacent middle segment of the snake bone.

In another embodiment, the angle of the inner chamfer is proportional to the length of the middle segment of the single snake bone.

In another embodiment, the angle of the inner chamfer is proportional to the number of nodes of the middle section of the snake bone.

In another embodiment, the included angles of rotation formed by the two lateral inclined surfaces are not equal.

In another embodiment, the back end of the snake bone component is connected with the snake bone tail section, the end surface between the connecting lugs of the connecting end of the middle section of the snake bone tail section forms a lateral inclined surface, the lateral inclined surface and the axial direction of the snake bone tail section form a rotation included angle, and the rotation included angle and the maximum bending angle of the adjacent snake bone middle section are in a complementary angle relationship; an inner chamfer is formed on the inner wall of the end face of the snake bone tail section.

In another embodiment, the front end of the snake bone component is connected with the first snake bone section, and the end surfaces between the connecting lugs at the two ends of the first snake bone section form a straight surface.

The utility model discloses the technological effect that can reach is:

the utility model discloses a plurality of storage tanks have been seted up at the inner wall of snake bone subassembly, place functional lines such as signal cable, trachea, optical fiber bundle respectively. Because the opening width of the accommodating groove in the inner hole of the rib section is smaller than the diameter of the accommodating groove, a signal cable, an air-water pipe, a light guide fiber bundle and the like placed in the groove are not easy to leave the accommodating groove to enter the inner hole of the rib section when the snake bone component is bent to cause a winding phenomenon with the clamp pipe, thereby solving the problem that the operation performance of each pipe, wire and light guide fiber in the inner space of the snake bone component is influenced by the winding, and avoiding the generation of faults.

The utility model discloses can make the small diameter endoscope below 6mm keep good the nature controlled, still guarantee the good smooth nature of pincers way inside pipe wall when the biggest bending of snake bone subassembly, the control of the biopsy forceps of being convenient for.

Drawings

It is to be understood by those skilled in the art that the following description is merely exemplary in nature and that the principles of the present invention may be applied in numerous ways to achieve many different alternative embodiments. These descriptions are only used to illustrate the general principles of the teachings of the present invention and are not meant to limit the inventive concepts disclosed herein.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the general description given above and the detailed description of the drawings given below, serve to explain the principles of the invention.

The invention will be described in further detail with reference to the following drawings and detailed description:

FIG. 1 is a schematic view of a snake bone assembly for controlling the bending angle of an endoscope in accordance with the present invention;

fig. 2 is an exploded schematic view of the present invention;

FIG. 3 is a perspective view of the middle section of the snake bone of the present invention;

fig. 4 is a perspective view of another angle of the middle section of the snake bone of the present invention;

FIG. 5 is a side view of the middle section of the snake bone of the present invention;

fig. 6 is a schematic view of the present invention in a bent state;

FIG. 7 is a schematic view showing a state in which a snake bone component of the prior art is bent, in which the upper half of a part of a snake bone segment is cut away to show the state of the inner wall of the bent side of the snake bone segment, and a break angle is formed between the adjacent snake bone segments;

FIG. 8 is a schematic view showing a bending state of the present invention, in which the upper half of a part of the snake bone segments is cut away to show the inner wall state of the bending side of the snake bone segments, and there is no break angle between the adjacent snake bone segments;

FIG. 9 is a schematic view of the snake bone of the present invention;

FIG. 10 is a schematic cross-sectional view of the middle section of the snake bone of the present invention;

fig. 11 is a schematic cross-sectional view of the present invention in a bent state.

The reference numbers in the figures illustrate:

1 is the tip part of the endoscope, 2 is the tip part cylinder,

3 is the first section of the snake bone, 4 is the middle section of the snake bone,

5 is a snake bone caudal knot, 6 is an insertion tube connecting sleeve,

4-1 is a female connecting lug, 4-2 is a shaft hole,

4-3 is a male connecting lug, 4-4 is a rotating shaft,

4-5 are lateral inclined planes, 4-6 are inner chamfers,

4-7 are rope-threading holes, 4-8 are holding grooves,

4-61 is the outer edge of the inner chamfer, 4-62 is the inner edge of the inner chamfer,

10 is biopsy forceps channel.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the terms "first," "second," and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" and similar words are intended to mean that the elements or items listed before the word cover the elements or items listed after the word and their equivalents, without excluding other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

As shown in fig. 1 and 2, the snake bone assembly for controlling the bending angle of the endoscope of the present invention comprises a plurality of snake bone intermediate sections 4 connected in sequence, and a snake bone head section 3 and a snake bone tail section 5 respectively disposed at two ends of the snake bone assembly, wherein each snake bone intermediate section 4 has the same structure, so as to save the cost of manufacturing the mold; the first segment 3 of the snake bone is connected with the front end part 1 of the endoscope through the front end part cylinder 2; the snake tail joint 5 is connected with an insertion tube connecting sleeve 6.

As shown in fig. 3, two ends of the middle section 4 of the snake bone form two oppositely arranged connection lugs respectively, one end is a male connection lug 4-3, and the other end is a female connection lug 4-1; a rotating shaft 4-4 is formed on the outer side of the male connecting lug 4-3, and the rotating shafts 4-4 of the two male connecting lugs 4-3 are coaxially arranged to form a rotating center at one end of the middle section 4 of the snake bone; the female connecting lug 4-1 is provided with a shaft hole 4-2, and the shaft hole 4-2 is matched with the rotating shaft 4-4; the shaft holes 4-2 of the two female connecting lugs 4-1 are coaxially arranged to form a rotation center at the other end of the middle section 4 of the snake bone; the rotating shaft 4-4 of the middle snake bone section 4 can penetrate through the shaft hole 4-2 of the adjacent middle snake bone section 4, so that the movable connection of the adjacent middle snake bone sections 4 is realized through the connection of the male connecting lug 4-3 and the female connecting lug 4-1;

the snake bone middle section 4 is connected with the snake bone first section 3 and the snake bone tail section 5 in the same way, and one end of the snake bone first section 3 and one end of the snake bone tail section 5 form a connecting lug matched with the adjacent snake bone middle section 4.

As shown in fig. 4 and 5, the end surface between the connection lugs at one end of the snake bone middle joint 4 forms a lateral inclined surface 4-5, the lateral inclined surface 4-5 forms a rotation included angle α 1 with the axial direction of the snake bone, and then the maximum bending angle α 2 of the adjacent snake bone middle joint 4 is 90 ° - α 1, as shown in fig. 6;

an inner chamfer 4-6 is formed on the inner wall of the end face;

four containing grooves 4-8 extending along the axial direction are distributed on the side wall of the inner hole of the middle section 4 of the snake bone along the circumferential direction; the pipe wall of the middle section 4 of the snake bone is provided with stringing holes 4-7 which extend along the axial direction.

The utility model discloses a terminal surface between the engaging lug of wherein one end of snake bone section (being snake bone middle section 4, snake bone tail section 5 or snake bone first section 3) is formed with side direction inclined plane 4-5, and when one of them wire rope in the snake bone was by the pulling, the snake bone can take place to buckle towards this wire rope place side, and maximum bend angle is the number of snake bone section x alpha 2.

Certainly, the included angle α 1 formed by the two lateral inclined planes 4-5 may not be equal, and at this time, the maximum upward bending angle and the maximum small bending angle of the middle segment 4 of the adjacent snake bone are not equal, so that the maximum upward bending angle and the maximum small bending angle of the snake bone are not equal.

The utility model discloses an end face inner edge between the engaging lug of snake bone section is formed with an interior chamfer 4-6, when the big bending action of snake bone subassembly, can not appear the angular state in edge between the adjacent snake bone section, consequently can not produce the problem of the angular extrusion tongued canal pipe (being working channel) outer wall in edge of snake bone section connecting portion.

In the process of bending the snake bone, when adjacent snake bone segments are contacted at the bending side, the maximum bending angle of the snake bone segments is obtained; as shown in fig. 7, the maximum bending angle of the snake bone segments when the end surfaces of adjacent snake bone segments intersect at line a; however, when the snake bone reaches this maximum bending angle, a break angle is formed between the end surfaces of adjacent snake bone segments, and the presence of this break angle presses the outer wall of the clip tube, which also forms a break angle in the clip tube, and this local internal space of the clip tube becomes smaller and is easily damaged. Meanwhile, when the biopsy forceps extend into the biopsy forceps channel, the folded angle can block the biopsy forceps and prevent the biopsy forceps from smoothly extending into the biopsy forceps channel. This problem is not evident with large diameter endoscopes, but is evident with small outer diameters below 6 mm. This is because when the diameter (i.e. the outer diameter) of the endoscope is less than 6mm, the forceps channel tube is required to be as large as possible to ensure that the biopsy forceps have enough movement space, so that the clearance between the inner diameter R of the endoscope and the outer wall of the forceps channel tube is very small (only 0.15mm), and the break angle of the biopsy channel can prevent the biopsy forceps from extending inwards.

The inner chamfer 4-6 is formed at the inner edge of the end surface of the snake bone joint, when the snake bone reaches the maximum bending angle, the outer edge 4-61 of the inner chamfer 4-6 of one snake bone joint is contacted with the adjacent snake bone joint, and the inner edge 4-62 (positioned at the side of the biopsy forceps channel) of the inner chamfer 4-6 is not contacted with the adjacent snake bone joint, but forms a gap B at the side of the biopsy forceps channel, as shown in figure 8; therefore, when the snake bone reaches the maximum bending angle, the inner wall of the snake bone component does not form a break angle, so that the forceps channel pipe is not squeezed, and the biopsy forceps can smoothly extend into the biopsy forceps channel.

The angle of the inner chamfer 4-6 (namely the acute angle formed by the edge of the chamfer and the axial direction of the snake bone joint) is in direct proportion to the maximum bending angle of the snake bone component, the length of a single snake bone and the number of joints of the snake bone;

the utility model discloses even when the snake bone does the big bending motion, the angular state in edge also can not appear between the adjacent snake bone festival, consequently can not produce the problem of the angular extrusion pincers pipeline (working channel) outer wall in edge of snake bone festival connecting portion, biopsy forceps still can stretch into the biopsy forceps way smoothly.

As shown in fig. 9, since the snake bone head section 3 and the adjacent snake bone intermediate section do not have a large-angle bending form, the end surface between the two connection lugs of the snake bone head section 3 does not need to be an inclined surface, and therefore, the end surface between the two connection lugs of the snake bone head section 3 is a straight surface, so that the end surface between the two connection lugs forms a right angle with the axial direction of the snake bone.

As shown in fig. 10, the middle section 4, the first section 3 and the tail section 5 of the snake bone have the same cross-sectional structure, the inner hole and the outer circle are concentrically arranged, the inner hole of the bone section is provided with four holding grooves 4-8, and the four holding grooves 4-8 are uniformly distributed along the circumference; the four accommodating grooves 4-8 are respectively used for accommodating signal cables, gas-water pipes, light guide fiber bundles and the like, so that different wires are isolated;

the diameter of the accommodating groove 4-8 is matched with the diameters of the signal cable, the air-water pipe and the light guide fiber bundle, and the opening width H of the accommodating groove 4-8 in the inner hole of the joint is smaller than the diameter of the accommodating groove 4-8; when the signal cable, the air-water pipe and the light guide fiber bundle are respectively arranged in the containing grooves 4-8 in a penetrating way, the diameter of the signal cable, the air-water pipe and the light guide fiber bundle is larger than the opening of the containing groove 4-8, so that the signal cable, the air-water pipe and the light guide fiber bundle in the containing groove 4-8 cannot easily run out of the opening of the containing groove 4-8, and cannot be wound with the clamp channel pipe during the bending operation of the snake bone assembly, thereby avoiding the generation of faults and improving the operation smoothness when the tip part of the endoscope operation insertion pipe is bent.

The utility model discloses a snake bone subassembly's crooked form is more mellow and full, and the inside biopsy forceps way (working channel) of snake bone subassembly also can keep mellow and full form when the crooked state of snake bone subassembly, guarantees that phenomenon of buckling can not appear in biopsy forceps way (working channel), has also guaranteed that the operation of the apparatus during operation through biopsy forceps way (working channel) is smooth and easy.

As shown in fig. 11, when the snake bone assembly of the present invention is at the maximum bending angle, the smoothness of the inner wall of the biopsy channel 10 is good, so that the biopsy forceps can smoothly extend into the biopsy channel.

The utility model is suitable for a soft endoscope of medical and industry, especially be applicable to the thin footpath endoscope below 6 mm.

The utility model can be made by plastic material injection molding process, and is particularly suitable for disposable endoscopes.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications of the present invention fall within the scope of the claims and their equivalent technologies, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A snake bone component for controlling the bending angle of an endoscope is characterized by comprising a plurality of snake bone middle sections which are connected in sequence; the end surface between the connecting lugs at one end of the middle snake bone section forms a lateral inclined surface, the lateral inclined surface and the axial direction of the middle snake bone section form a rotation included angle, and the rotation included angle and the maximum bending angle of the adjacent middle snake bone section form a complementary angle relationship; a plurality of containing grooves extending along the axial direction are distributed on the side wall of the inner hole of the middle section of the snake bone along the circumferential direction.

2. A snake bone assembly for controlling the bending angle of an endoscope according to claim 1, wherein the diameter of said receiving slot matches the diameter of the functional wire to be received.

3. A snake bone assembly for controlling the bending angle of an endoscope, according to claim 1 or 2, wherein the opening width of said receiving slot in the internal hole of the condyle is smaller than the diameter of the receiving slot.

4. The snake bone assembly for controlling the bending angle of an endoscope according to claim 1, wherein the inner wall of the end surface of the middle section of the snake bone is formed with an inner chamfer.

5. A snake bone assembly for controlling the bending angle of an endoscope according to claim 4, wherein the angle of said inner chamfer is proportional to the maximum bending angle of the intermediate segment of the adjacent snake bone.

6. A snake bone assembly for controlling the bending angle of an endoscope according to claim 4 or 5, wherein the angle of said inner chamfer is proportional to the length of the middle segment of a single snake bone.

7. A snake bone assembly for controlling the bending angle of an endoscope, according to claim 4 or 5, wherein the angle of said inner chamfer is proportional to the number of nodes of the middle segment of the snake bone.

8. A snake bone assembly for controlling the bending angle of an endoscope according to claim 1, wherein the included angles of rotation formed by two of said lateral inclined surfaces are not equal.

9. The snake bone assembly for controlling the bending angle of an endoscope, according to claim 1, wherein the snake bone assembly is connected with the snake bone caudal joint at the rear end thereof, the end surface between the connection lugs of the connection end of the middle joint of the snake bone caudal joint forms a lateral inclined surface, the lateral inclined surface and the axial direction of the snake bone caudal joint form a rotation included angle, and the rotation included angle and the maximum bending angle of the adjacent snake bone caudal joint are in a complementary angle relationship; an inner chamfer is formed on the inner wall of the end face of the snake bone tail section.

10. The snake bone assembly for controlling the bending angle of an endoscope, according to claim 1 or 9, wherein the front end of the snake bone assembly is connected with a snake bone first section, and the end surface between the connection lugs at the two ends of the snake bone first section forms a straight surface.

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