Front-end cap assembly and stone extraction basket under choledochoscope

Abstract

The present invention provides a front-end cap assembly and a stone extraction basket under a choledochoscope, relating to the technical field of medical devices. The front-end cap assembly provided by the present invention includes a cap body and a limit connecting piece sleeved on the cap body; a part of the cap body extending into the limit connecting piece has a plurality of through holes for threading the basket wires, and each through hole is formed on the side surface of the cap body; a limit cavity for defining the position of the basket wires is formed between the limit connecting piece and the cap body. The front-end cap assembly provided by the present invention can enlarge the opening area, reduce the opening difficulty, improve the product qualification rate, and at the same time, the outer diameter size of the cap body during processing can be reduced to 1 mm or the outer diameter size is less than 1 mm. Even if the number of basket wires is increased, there is no need to greatly increase or even increase the outer diameter of the cap body, which is more conducive to the popularization of the stone extraction technology under a choledochoscope.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a front end cap assembly and a stone extraction basket under a choledochoscope. Background Art

[0002] Taking stones from the common bile duct through a duodenoscope is the main method for treating common bile duct stones. Taking stones from the common bile duct through a duodenoscope requires cholangiography of the bile duct and cannot take stones under direct vision. The stones are imaged as a plane under X-ray, and the operator cannot accurately judge the size of the stones. Existing traditional stone extraction baskets are too large in size and cannot enter the choledochoscope to take stones under direct vision. With the development and popularization of choledochoscopes, stone extraction instruments under choledochoscopes have been gradually promoted. In this way, doctors do not need to assist in taking stones with the help of X-rays, and doctors, nurses, and patients will not be harmed by X-ray radiation.

[0003] Such as Figure 1 and Figure 2 shown Figure 1 is a three-dimensional structure diagram of a front end cap of a stone extraction basket adopting a four-hole scheme in the prior art; Figure 2 is a longitudinal sectional view of a front end cap of a stone extraction basket adopting a four-hole scheme in the prior art. In the prior art, four insertion holes 1 are opened on the end face of the front end cap, which can be used for threading basket wires for weaving. Since the basket needs to pass through the endoscopic forceps channel with a smaller inner diameter, the outer diameter of the front end cap needs to be designed very small. When the number of basket wires is large, the number of corresponding insertion holes 1 needs to be increased, which requires more insertion holes 1 to be opened on the end face of the front end cap with a very small area, significantly increasing the processing cost and reducing the qualification rate. Summary of the Invention

[0004] The purpose of the present invention is to provide a front end cap assembly and a stone extraction basket under a choledochoscope, which can expand the opening area, reduce the opening difficulty, improve the product qualification rate, and the outer diameter size of the end cap body can be reduced to 1 mm or the outer diameter size is less than 1 mm during processing.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a front end cap assembly, including an end cap body and a limit connecting piece sleeved on the end cap body;

[0007] The part of the end cap body extending into the limit connecting piece has a plurality of through holes for threading basket wires, and each of the through holes is opened on the side surface of the end cap body;

[0008] A limit cavity for limiting the position of the basket wire is formed between the limit connecting piece and the end cap body.

[0009] Further, each of the through holes is distributed at different heights of the end cap body.

[0010] Further, the plurality of through holes include at least one first through hole and at least one second through hole, the axis of the first through hole and the axis of the second through hole have an included angle; and the first through hole and the second through hole are spaced apart and distributed along the height direction of the end cap body.

[0011] Further, the number of the first through holes is two, and the number of the second through hole is one.

[0012] Furthermore, the axes of any two of the through holes have an included angle.

[0013] Furthermore, along the height direction of the end cap body, the angles between the axes of two adjacent through holes are the same.

[0014] Furthermore, the portion of the end cap body extending into the position-limiting connector includes a polygonal column structure having an even number of side surfaces, and each through hole penetrates a pair of oppositely disposed side surfaces of the polygonal column.

[0015] Furthermore, the portion of the end cap body extending into the limiting connector and / or the inner wall of the limiting connector has a limiting groove, and the limiting groove is used to accommodate the basket wire.

[0016] In a second aspect, the present invention further provides a choledochoscopy-assisted stone removal basket, comprising a basket wire, a storage assembly, a handle, a pull cable mechanism, and the front end cap assembly described in the above scheme, wherein the basket wire is passed through the end cap body, the storage assembly is connected to the handle, and the pull cable mechanism passes through the handle and the storage assembly and is connected to an end of the basket wire that is away from the end cap body.

[0017] Furthermore, the storage assembly includes a capacity expansion tube and an elastic tube, one end of the elastic tube is connected to the handle, and the other end of the elastic tube is connected to the capacity expansion tube, and the inner diameter of the capacity expansion tube is larger than the inner diameter of the elastic tube.

[0018] The front end cap assembly and the choledochoscope stone removal basket provided by the present invention can produce the following beneficial effects:

[0019] Compared with the prior art, the front end cap assembly provided in the first aspect of the present invention breaks away from the traditional method of opening through holes on the end face of the front end cap to weave a basket wire, and instead opens a plurality of through holes on the side of the end cap body. The position of the basket wire is limited by the limiting cavity between the limiting connector and the end cap body, thereby expanding the opening area, reducing the difficulty of opening the hole, and improving the product qualification rate. At the same time, during processing, the outer diameter of the end cap body can be reduced to 1 mm or its outer diameter is less than 1 mm. Even if the number of basket wires is increased, there is no need to increase the outer diameter of the end cap body by a large amount or even no need to increase it, which is more conducive to the promotion of choledochal endoscopic stone removal technology.

[0020] Compared with the prior art, the stone extraction basket under choledochoscope provided in the second aspect of the present invention can smoothly pass through the forceps channel of the choledochoscope to extract stones under direct vision, without the need to inject contrast agents, reducing the operation time. Moreover, the structure of the stone extraction basket under choledochoscope is safe and reliable, and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 FIG. 10 is a three-dimensional structural diagram of the front end cap of a stone extraction basket in the prior art when a four-hole scheme is adopted;

[0023] Figure 2 FIG. 14 is a longitudinal sectional view of the front end cap of a stone extraction basket in the prior art when a four-hole scheme is adopted;

[0024] Figure 3 FIG. 18 is an exploded view of a front end cap assembly provided in the first aspect of the present invention;

[0025] Figure 4 FIG. 22 is a longitudinal sectional view of a front end cap assembly provided in the first aspect of the present invention;

[0026] Figure 5 FIG. 26 is an exploded view of a front end cap assembly and a basket wire when they are cooperated in the first embodiment of the present invention;

[0027] Figure 6 FIG. 30 is a structural diagram of a connection between a front end cap body and a basket wire when they are cooperated in the first embodiment of the present invention;

[0028] Figure 7 FIG. 34 is a structural diagram of a front end cap body provided in the second embodiment of the present invention;

[0029] Figure 8 FIG. 38 is an exploded view of another front end cap assembly provided in the first aspect of the present invention;

[0030] Figure 9 FIG. 42 is a three-dimensional structural diagram of the stone extraction basket under choledochoscope provided in the second aspect of the present invention.

[0031] Icons: 1 - Interpenetrating holes; 2 - End cap body; 21 - Multiple through holes; 211 - First through hole; 212 - Second through hole; 213 - Third through hole; 214 - Fourth through hole; 215 - Fifth through hole; 22 - First limiting groove; 3 - Limiting connecting piece; 31 - Second limiting groove; 4 - Basket wire; 5 - Limiting cavity; 6 - Storage component; 61 - Volume increasing tube; 62 - Elastic tube; 7 - Handle; 71 - Liquid injection port; 8 - Cable mechanism; 81 - Cable assembly; 82 - Cable handle. Detailed implementation manners

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] The following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] An embodiment of the first aspect of the present invention is to provide a front end cap assembly, as Figure 3 and Figure 4As shown in the figure, it includes an end cap body 2 and a limiting connecting piece 3 sleeved on the end cap body 2; the part of the end cap body 2 extending into the limiting connecting piece 3 has a plurality of through holes 21 for passing through the basket wires 4, and each through hole is opened on the side surface of the end cap body 2; a limiting cavity 5 for limiting the position of the basket wires 4 is formed between the limiting connecting piece 3 and the end cap body 2.

[0037] Specifically during assembly, multiple basket wires 4 can be correspondingly passed through the multiple through holes for weaving one by one, and then the limiting connecting piece 3 is connected to the end cap body 2 to limit the positions of the respective basket wires 4 relative to the end cap body. Therefore, during the assembly process, one basket wire 4 only needs to pass through one through hole, which is simpler than the prior art where one basket wire 4 needs to pass through two insertion holes 1. In addition, the through holes in the above-mentioned front end cap assembly are opened on the side surface of the end cap body 2, which expands the opening area, reduces the opening difficulty, effectively improves the product qualification rate, and at the same time, the outer diameter size of the end cap body during processing can be reduced to 1 mm or its outer diameter size is less than 1 mm, and the front end cap assembly can smoothly enter the choledochoscope forceps channel, and stones can be removed under direct vision through the choledochoscope.

[0038] Among them, as Figure 3 and Figure 4 shown, the limiting connecting piece 3 has a cylindrical structure, and the limiting connecting piece 3 and the end cap body 2 can be connected by means of threaded connection, snap connection, welding, etc.

[0039] Of course, the limiting connecting piece 3 is not limited to the above structure, and any structure that can form a limiting cavity 5 for limiting the position of the basket wires 4 with the end cap body 2 is acceptable.

[0040] The following specifically describes the distribution of the multiple through holes 21:

[0041] In some embodiments, as Figures 3 to 4 shown, each through hole is distributed at different heights of the end cap body 2.

[0042] The above setting can avoid the situation where through holes are concentratedly distributed on a certain cross-section of the end cap body 2, facilitate the opening of the end cap body 2 during the processing, and can effectively avoid interference between the respective basket wires 4.

[0043] On the basis of the above embodiments, as Figure 4 shown, the axial directions of each through hole are all parallel to the cross-section of the end cap body 2, realizing the independent setting of each through hole.

[0044] According to the arrangement type of the multiple through holes 21, it can be specifically divided into the following two embodiments:

[0045] Embodiment 1:

[0046] In this Embodiment 1, as Figure 5and Figure 6 As shown in Figure 6 , a plurality of through holes 21 include at least one first through hole 211 and at least one second through hole 212. The axis of the first through hole 211 and the axis of the second through hole 212 form an included angle; and the first through hole 211 and the second through hole 212 are spaced apart along the height direction of the end cap body 2.

[0047] The following is a specific description for Figure 5 In this case, one first through hole 211 is configured to pass through the first wire basket wire 4; one second through hole 212 is configured, and the second through hole 212 is located below the first through hole 211, and the second through hole 212 is used to pass through the second wire basket wire 4.

[0048] The following is a specific description for Figure 6 In this case, two first through holes 211 are configured. The two first through holes 211 are distributed vertically, and two wire basket wires 4 are respectively passed through the two first through holes 211 in a one-to-one correspondence; one second through hole 212 is configured, and along the height direction of the end cap body 2, the second through hole 212 is located between the two first through holes 211, and the second through hole 212 is used to pass through the third wire basket wire 4.

[0049] Specifically, in Figure 5 and Figure 6 the axes of the first through hole 211 and the second through hole 212 are both parallel to the cross-section of the end cap body 2, and the included angle between the axis of the first through hole 211 and the axis of the second through hole 212 is 90°.

[0050] In the first embodiment, as the number of the first through hole 211 and the second through hole 212 increases, the processing personnel can continuously increase the height of the end cap body 2, so as to provide a larger opening area, without expanding the outer diameter of the end cap body 2, and the outer diameter dimension of the end cap body 2 only needs to allow one wire basket wire 4 to pass through horizontally. Other wire basket wires 4 can pass through the through holes below the above-mentioned wire basket wire in turn, and the outer diameter dimension of the end cap body 2 can be reduced to 1 mm or the outer diameter dimension is less than 1 mm.

[0051] Embodiment Two:

[0052] In the second embodiment, as shown in Figure 7 the axes of any two through holes form an included angle.

[0053] The above structure avoids the axes of any two through holes being on the longitudinal section of the end cap body 2 at the same time. After each wire basket wire 4 is woven into a wire basket, along the circumferential direction of the wire basket, each wire basket wire 4 is more evenly distributed, and there is no phenomenon that the extension paths of each wire basket wire 4 overlap.

[0054] In the second embodiment, along the height direction of the end cap body 2, the included angles between the axes of two adjacent through holes are the same, so that after assembly, each wire basket wire 4 is evenly distributed along the circumferential direction of the wire basket.

[0055] Among them, the number of through holes can be two, three, four, five, etc., and the included angles between the axes of two adjacent through holes are respectively 90°, 60°, 45°, 36°, etc.

[0056] As Figure 7 shown, the through holes are configured as three, namely the third through hole 213, the fourth through hole 214 and the fifth through hole 215. The third through hole 213, the fourth through hole 214 and the fifth through hole 215 are arranged in a spiral pattern, and the included angle between the axes of two adjacent through holes is 60°. Each through hole corresponds to one wire basket wire 4 passing through.

[0057] The following specifically describes the structure of the end cap body 2:

[0058] In some embodiments, to facilitate the accurate positioning of each through hole, the part of the end cap body 2 extending into the limit connecting member 3 includes a prism structure. The prism structure has an even number of side faces, and each through hole penetrates a pair of opposite side faces of the prism.

[0059] As Figure 6 shown, the part of the end cap body 2 extending into the limit connecting member 3 includes a quadrangular prism structure. Each first through hole 211 penetrates a pair of opposite side faces of the quadrangular prism structure, and each second through hole 212 penetrates another pair of opposite side faces of the quadrangular prism structure; as Figure 7 shown, the part of the end cap body 2 extending into the limit connecting member 3 includes a hexagonal prism structure. The third through hole 213 penetrates a pair of opposite side faces of the hexagonal prism structure, the fourth through hole 214 penetrates another pair of opposite side faces of the hexagonal prism structure, and the fifth through hole 215 penetrates the last pair of opposite side faces of the hexagonal prism structure.

[0060] In some embodiments, the end cap body 2 further includes a head and a connecting portion. The two ends of the connecting portion are respectively connected to the head and the prism structure, and the limit connecting member 3 is sleeved outside the connecting portion and the prism structure.

[0061] Among them, the shape of the head can be various. For example, the shape of the head can be conical, semi-circular, etc.

[0062] In at least one embodiment, as Figure 6 shown, the shape of the head is conical, and the end is smoothly transitioned.

[0063] The following specifically describes a preferred embodiment of the front end cap assembly:

[0064] In some embodiments, the portion of the end cap body 2 extending into the limiting connector 3 and / or the inner wall of the limiting connector 3 has a limiting groove, which is used to accommodate the basket wire 4 to ensure the stability of the position of the basket wire 4 relative to the end cap assembly.

[0065] Specifically, only the portion of the end cap body 2 extending into the limiting connector 3 may have the first limiting groove 22 , and the cross section of the first limiting groove 22 may be semicircular, rectangular, or the like.

[0066] The inner wall of the limiting connector 3 may also have a second limiting groove 31 , and the cross section of the second limiting groove 31 may be semicircular, rectangular, or the like.

[0067] Of course, in at least one embodiment, Figure 8 As shown, the portion of the end cap body 2 extending into the limiting connector 3 has a first limiting groove 22 , and the inner wall of the limiting connector 3 has a second limiting groove 31 , which is engaged with the first limiting groove 22 to limit the basket wire 4 .

[0068] Among them, Figure 8 As shown, the first limiting groove 22 extends from the end of the through hole to the bottom end of the end cap body 2, and the second limiting groove 31 is arranged opposite to the first limiting groove 22. Each through hole corresponds to two first limiting grooves 22 and two second limiting grooves 31, that is, a pair of first limiting grooves 22 and second limiting grooves 31 that are interlocked together limit the basket wire 4 extending from one end of the through hole.

[0069] The second aspect of the present invention provides a choledochoscope stone removal basket, such as Figure 9 As shown, the choledochoscopy stone removal basket provided by the embodiment of the second aspect of the present invention includes a basket wire 4, a storage assembly 6, a handle 7, a pull cable mechanism 8 and the above-mentioned front end cap assembly, the basket wire 4 is passed through the end cap body 2, the storage assembly 6 is connected to the handle 7, and the pull cable mechanism 8 passes through the handle 7 and the storage assembly 6 and is connected to the end of the basket wire 4 away from the end cap body 2.

[0070] During the process of bile duct stone removal, the duodenal papilla is first incised to facilitate the entry of a choledochoscope into the bile duct. The choledochoscope explores the bile duct to determine the location of the stone, and then the above-mentioned stone removal basket is inserted through the choledochoscope. The handle 7 is held, and a liquid injection port 71 is provided on the handle 7. Under direct vision of the choledochoscope, the basket composed of multiple basket wires 4 is pushed out of the storage component 6 through the cable mechanism 8, and the basket is opened. After the basket completely surrounds the stone, the cable mechanism 8 is used to close the basket, grasp the stone, and slowly bring the stone out of the bile duct to complete the stone removal step.

[0071] Among them, Figure 9As shown, the storage assembly 6 includes a capacity expansion tube 61 and an elastic tube 62, one end of the elastic tube 62 is connected to the handle 7, and the other end of the elastic tube 62 is connected to the capacity expansion tube 61, and the inner diameter of the capacity expansion tube 61 is larger than the inner diameter of the elastic tube 62. Since the inner diameter of the elastic tube 62 is small, the provision of the capacity expansion tube 61 can increase the space for retracting the net basket, thereby avoiding difficulties in collecting the net basket.

[0072] The capacity expansion tube 61 may be a hypo tube, a spring tube, a braided tube, or the like.

[0073] Specifically, the capacity increasing tube 61 and the elastic tube 62 are welded.

[0074] In some embodiments, the outer surface of the expansion tube 61 is sprayed or coated with a material with a low friction coefficient so that the front end of the stone removal basket can smoothly pass through the endoscope channel.

[0075] The material with low friction coefficient can be resin, polymer coating material or lubricating grease material.

[0076] In at least one embodiment, the material with a low friction coefficient is PTFE (Poly tetra fluoroethylene).

[0077] In addition, if Figure 9 As shown, the cable mechanism 8 includes a cable assembly 81 and a cable handle 82 . One end of the cable assembly 81 is connected to a basket composed of a plurality of basket wires 4 through a connector, and the other end is connected to the cable handle 82 .

[0078] In summary, the front end cap assembly and the choledochoscope stone removal basket provided by the first and second aspects of the present invention have the following advantages:

[0079] 1. Multiple through holes are opened on the side of the end cap body 2, and the position of the basket wire 4 is limited by the limit cavity 5 between the limit connector 3 and the end cap body 2, so as to expand the opening area, reduce the difficulty of opening, and improve the product qualification rate;

[0080] 2. During processing, the outer diameter of the end cap body can be reduced to 1 mm or less than 1 mm. Even if the number of basket wires is increased, there is no need to increase the outer diameter of the end cap body by a large amount or even no need to increase it, which is more conducive to the promotion of choledochoscopy stone removal technology;

[0081] 3. During assembly, one basket wire 4 only needs to pass through one through hole, making the assembly process simpler;

[0082] 4. The portion of the cap body 2 extending into the limiting connector 3 and / or the inner wall of the limiting connector 3 has a limiting groove to ensure that the basket has good stability;

[0083] 5. An expansion tube 61 is welded to the end of the elastic tube 62, which can increase the space for retracting the wire basket and avoid the difficulty of retracting the wire basket.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A front end cap assembly, characterized in that, It comprises an end cap body (2) and a position limiting connecting piece (3) sleeved on the end cap body (2); The portion of the end cap body (2) extending into the position-limiting connecting piece (3) has a plurality of through holes (21) for passing the basket wire (4), the portion of the end cap body (2) extending into the position-limiting connecting piece (3) comprises a polygonal column structure, the polygonal column structure has an even number of side surfaces, each of the through holes (21) penetrates a pair of oppositely arranged side surfaces of the polygonal column, and one basket wire (4) passes through only one of the through holes (21); A limiting cavity (5) for limiting the position of the basket wire (4) is formed between the limiting connecting piece (3) and the end cap body (2).

2. The front end cap assembly according to claim 1, characterized in that, The through holes are distributed at different heights of the end cap body (2).

3. The front end cap assembly according to claim 2, wherein The plurality of through holes (21) include at least one first through hole (211) and at least one second through hole (212); an axis of the first through hole (211) and an axis of the second through hole (212) have an included angle; and the first through hole (211) and the second through hole (212) are spaced apart and distributed along a height direction of the end cap body (2).

4. The front end cap assembly according to claim 3, wherein, The number of the first through holes (211) is two, and the number of the second through hole (212) is one.

5. The front end cap assembly according to claim 2, characterized in that, Axes of any two of the through holes have an included angle.

6. The front end cap assembly according to claim 5, wherein, Along the height direction of the end cap body (2), the angles between the axes of two adjacent through holes are the same.

7. The front end cap assembly according to any one of claims 1-6, characterized in that, The portion of the end cap body (2) extending into the limiting connection piece (3) and / or the inner wall of the limiting connection piece (3) has a limiting groove, and the limiting groove is used to accommodate the basket wire (4).

8. A stone retrieval basket under choledochoscope, characterized in that, It comprises a basket wire (4), a storage assembly (6), a handle (7), a cable mechanism (8) and a front end cap assembly as described in any one of claims 1 to 7, wherein the basket wire (4) is passed through the end cap body (2), the storage assembly (6) is connected to the handle (7), and the cable mechanism (8) passes through the handle (7) and the storage assembly (6) is connected to an end of the basket wire (4) facing away from the end cap body (2).

9. The stone extraction basket under choledochoscope according to claim 8, characterized in that, The storage assembly (6) comprises a capacity expansion tube (61) and an elastic tube (62); one end of the elastic tube (62) is connected to the handle (7); the other end of the elastic tube (62) is connected to the capacity expansion tube (61); and the inner diameter of the capacity expansion tube (61) is greater than the inner diameter of the elastic tube (62).

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