Calculus removing mesh basket

Abstract

The utility model relates to a calculus removing mesh basket. The netting basket comprises a sheathing canal, a push-pull assembly and a netting basket body, the netting basket body comprises a first netting basket wire, a second netting basket wire and a connecting piece, the first netting basket wire is bent in the middle to form a bent part at the far end of the first netting basket wire, the two ends of the bent part penetrate through the connecting piece and are spaced, and the near end of the first netting basket wire is connected to the push-pull assembly; the near end of the second mesh basket wire is connected to the push-pull assembly, the far end of the second mesh basket wire is arranged in the connecting piece, under the action of traction force of the push-pull assembly, the far end of the second mesh basket wire can be separated from the connecting piece, and the connecting piece is blocked by the bent part to be connected with the first mesh basket wire. The calculus removing mesh basket can be used for removing calculi, the calculi which cannot pass through nipples can be crushed and then taken out, when calculi inlay occurs, the far end of the second mesh basket wire can be separated from the connecting piece, so that the purpose of releasing the calculi is achieved, due to blocking of the bent part, the connecting piece cannot be pulled off even if stress is too large, and the calculi can be removed. And the situation that the connecting piece falls off and remains in the human body is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a stone removal net basket. Background Art

[0002] Gallstones are a common clinical disease of the biliary system. The stone removal basket is a commonly used stone removal instrument in clinical practice. The existing stone removal basket cannot remove larger stones that cannot pass through the papilla. When the basket is subjected to excessive force, the metal head connection strength of the basket head is insufficient, and it is easy for the basket to fall off and remain in the bile duct. Larger stones are also prone to incarceration. Once the stone is incarcerated, the basket cannot be removed or sent back into the bile duct to release the stone, resulting in the need to use emergency lithotripsy equipment or to cut the basket shell tube from the handle and send the basket for emergency surgery. These technical drawbacks bring great distress and surgical risks to clinical operators. Utility Model Content

[0003] The utility model aims to provide a new type of stone-removing net basket. The stone-removing net basket has a simple structure and is easy to operate. It can remove stones. If a large stone cannot pass through the nipple, it can be crushed and then removed. If a stone is stuck during stone removal or crushing, the stone can be successfully released. At the same time, the connecting parts will not fall off completely and remain in the human body due to excessive force.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A stone removal basket, comprising a sheath tube, a push-pull assembly inserted in the sheath tube, and a basket connected to the distal end of the push-pull assembly, wherein the basket is extended or retracted at the distal end of the sheath tube under the traction of the push-pull assembly, the basket comprises a first basket wire, a second basket wire, and a connector, wherein the first basket wire is bent in the middle to form a bent portion at its distal end, and both ends of the bent portion pass through the connector respectively and are spaced apart, and the proximal end of the first basket wire is connected to the push-pull assembly;

[0006] The proximal end of the second basket wire is connected to the push-pull assembly and the distal end thereof is placed in the connecting member.

[0007] Under the traction force of the push-pull assembly, the distal end of the second basket wire can be separated from the connecting piece, and the connecting piece is blocked by the bent portion and remains connected to the first basket wire.

[0008] When encountering a large stone that cannot pass through the nipple, the stone removal basket of the present application can increase the traction force of the push-pull component on the basket to crush the stone before removing it. When the stone is stuck, the distal end of the second basket wire can be detached from the connecting piece when a greater traction force is applied to the basket, thereby achieving the purpose of releasing the stone. Due to the obstruction of the bent part, the connecting piece will not be pulled off even if it is subjected to excessive force, thereby preventing the connecting piece from falling off and remaining in the human body.

[0009] Preferably, the connecting member has a first hole and a second hole arranged at intervals, one end of the bent portion penetrates from the distal end of the first hole and exits from the proximal end of the first hole, and the other end penetrates from the distal end of the second hole and exits from the proximal end of the second hole.

[0010] In some embodiments, the first hole and the second hole are through holes that penetrate the connecting member along the axial direction of the connecting member.

[0011] In some specific implementations, the bent portion is riveted into the first hole and the second hole.

[0012] Preferably, there is a certain distance between the distal end of the bent portion of the first basket wire and the connecting member, and the distance is greater than or equal to the length of the second basket wire placed in the connecting member. By setting this distance, the connecting member will not be blocked by the bent portion at the beginning, but will be blocked by the bent portion after moving a certain distance relative to the basket wire, thereby ensuring that the second basket wire and the connecting member can be smoothly separated.

[0013] Preferably, the connecting piece has a third hole, and the distal end of the second basket wire is riveted into the third hole. By riveting, the connection strength between the second basket wire and the connecting piece is increased, and for larger stones that cannot pass through the nipple, by applying a certain traction force to the basket (the traction force is less than the traction force that causes the second basket wire to be separated from the connecting piece), the stone can be crushed without causing the second basket wire to be separated from the connecting piece.

[0014] Further preferably, the third hole is a blind hole extending along the axial direction of the connecting piece, and the depth of the third hole is 1 / 3 to 2 / 3 of the length of the connecting piece.

[0015] In some embodiments, the depth of the third hole is 1 / 2 of the length of the connecting member.

[0016] Preferably, the number of the first basket wire is one, and the number of the second basket wire is a plurality.

[0017] More preferably, the number of the second basket wires is two.

[0018] Preferably, the first basket wire and the second basket wire are metal wires, such as nickel titanium wires.

[0019] Preferably, the net basket further comprises a cap sleeved on the connecting member.

[0020] Preferably, the push-pull assembly includes a booster tube, a pull cable and a fixed tube, the two ends of the pull cable are respectively connected to the distal end of the booster tube and the proximal end of the fixed tube, and the proximal ends of the first basket wire and the second basket wire are both connected to the distal end of the fixed tube.

[0021] In some embodiments, two ends of the cable are fixedly connected to the booster tube and the fixed tube respectively by laser welding.

[0022] In some embodiments, the proximal ends of the first basket wire and the second basket wire are riveted to the fixing tube.

[0023] Preferably, the stone retrieval basket further comprises a cluster tube located between the connecting piece and the fixed tube and arranged close to the fixed tube, and the first basket wire and the second basket wire are riveted inside the cluster tube.

[0024] Preferably, the stone removal basket also includes a handle and a three-way assembly, the handle including a handle body and a sliding handle that can be slidably arranged on the handle body along the length direction of the handle body; the proximal end and the distal end of the three-way assembly are respectively connected to the handle body and the sheath tube, and the proximal end of the push-pull assembly is fixedly connected to the sliding handle. In response to the sliding handle, the push-pull assembly moves along the axial direction of the sheath tube.

[0025] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0026] The stone-removing basket of the utility model can remove stones. If a large stone cannot pass through the nipple, it can be crushed and then removed. When a stone is stuck, the distal end of the second basket wire can be separated from the connecting piece, thereby achieving the purpose of releasing the stone. Due to the obstruction of the bent part, the connecting piece will not be pulled off even if it is subjected to excessive force, thereby preventing the connecting piece from falling off and remaining in the human body.

[0027] The stone-taking net basket of the utility model has a simpler structure, is more convenient to operate and has good safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the stone-taking basket in Example 1;

[0029] Figure 2 is a schematic structural diagram of the basket in Example 1;

[0030] Figure 3 for Figure 2 Sectional view of the AA plane;

[0031] Figure 4 is a schematic structural diagram of the connecting member in Example 1;

[0032] Figure 5 for Figure 4 Sectional view of the middle BB plane;

[0033] Figure 6 This is a schematic diagram of the structure of the basket and the push-pull assembly in Example 1;

[0034] Figure 7 is a schematic diagram of the structure of the fixed tube in Example 1;

[0035] Figure 8 for Figure 7 Sectional view of the middle CC plane;

[0036] Fig. 9 It is a structural schematic diagram of the booster tube in Example 1;

[0037] Fig.10 Schematic diagram of the structure of the cluster tube in Example 1;

[0038] Fig.11 This is a schematic diagram of the structure of the basket in Example 1 when taking large gravel;

[0039] Fig.12 This is a schematic diagram of the structure of the basket in Example 1 when taking small gravel;

[0040] Fig.13 This is a schematic structural diagram of the basket in Example 1 when a second basket wire is separated from the connecting piece;

[0041] Fig.14 This is a schematic diagram of the structure when the basket in Example 1 is blocked and two second basket wires are separated from the connecting piece;

[0042] Wherein: 1. basket; 11. first basket wire; 111. bent portion; 12. second basket wire; 13. connector; 131. first hole; 132. second hole; 133. third hole; 14. end cap;

[0043] 2. Sheath;

[0044] 3. Three-way assembly;

[0045] 4. handle; 41. handle body; 42. handle head; 43. sliding handle; 44. slide groove;

[0046] 5. Booster tube;

[0047] 6. Cable;

[0048] 7. fixed pipe; 71. first slot 1; 72. second slot;

[0049] 8. Cluster tube;

[0050] 9. Stones;

[0051] L1, depth of the third hole; L2, length of the connector. DETAILED DESCRIPTION

[0052] The utility model is further described below in conjunction with the embodiments shown in the accompanying drawings.

[0053] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0054] In the description of the embodiments of the present invention, it should be understood that the terms "far" and "near" and the like indicate positions or positional relationships defined by the position of the stone-removing basket when in use, wherein the side close to the operator is the near end, and the side away from the operator is the far end. This is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0056] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0057] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0058] Example 1

[0059] A stone-taking basket, such as Figure 1 As shown, it includes a handle 4, a sheath tube 2 located at the distal end of the handle 4, a push-pull assembly inserted in the sheath tube 2 and connected to the handle 4 at the proximal end, and a basket 1 connected to the distal end of the push-pull assembly. The handle 4 is configured to push and pull the push-pull assembly so that the basket 1 extends out of the distal end of the sheath tube 2 under the traction of the push-pull assembly ( Figure 1 shown in the figure) or contracted at the distal end of the sheath tube 2 (not shown in the figure).

[0060] The basket 1 includes a first basket wire 11, a second basket wire 12 and a connecting member 13. Figure 2 and Figure 3 As shown, the first basket wire 11 is bent in the middle to form a bent portion 111 at its distal end, and the two ends of the bent portion 111 pass through the connecting piece 13 respectively and are spaced apart. The proximal end of the first basket wire 11 is connected to the push-pull assembly; the proximal end of the second basket wire 12 is connected to the push-pull assembly and its distal end is placed in the connecting piece 13. When the basket 1 extends out of the distal end of the sheath tube 2, the first basket wire 11 and the second basket wire 12 form a basket structure, which can be used to collect stones 9 ( Fig.11 and Fig.12 shown).

[0061] like Figure 4 and Figure 5 As shown, the connector 13 has a first hole 131, a second hole 132 and a third hole 133 arranged at intervals, wherein the first hole 131 and the second hole 132 are through holes that penetrate the connector 13 axially along the connector 13; the third hole 133 is located at the proximal end of the connector 13 and is a blind hole extending axially along the connector 13, and the depth L1 of the third hole is 1 / 3 to 2 / 3 of the length L2 of the connector. In this embodiment, the depth L1 of the third hole is 1 / 2 of the length L2 of the connector, which is 2 mm. One end of the bent portion 111 penetrates from the distal end of the first hole 131 and exits from the proximal end of the first hole 131, and the other end penetrates from the distal end of the second hole 132 and exits from the proximal end of the second hole 132 ( Figure 2As shown); the distal end of the second basket wire 12 is placed in the third hole 133. When the basket 1 is stuck and cannot be removed, the handle 4 continuously applies tension to the basket wire. When the applied tension reaches a certain level, the distal end of the second basket wire 12 is separated from the connecting member 13. Due to the obstruction of the bent portion 111 of the first basket wire 11, the connecting member 13 remains connected to the first basket wire 11 and will not be pulled off, thereby preventing the connecting member 13 from falling off and remaining in the human body.

[0062] There is a certain distance between the distal end of the bent portion 111 and the connector 13, and the distance is greater than or equal to the length of the second basket wire 12 placed in the connector 13. In this embodiment, the distance is 2 to 3 mm. Since the proximal ends of the first basket wire 11 and the second basket wire 12 are both connected to the push-pull assembly, when the basket 1 is pulled by the push-pull assembly, the first basket wire 11 and the second basket wire 12 will be subjected to tension, but due to the obstruction of the bent portion 111 of the first basket wire 11, it is difficult for the connector 13 to move relative to the basket wire. By setting this distance, the connector 13 will not be obstructed by the bent portion 111 at the beginning, but will be obstructed by the bent portion 111 after moving a certain distance relative to the basket wire, thereby ensuring that the second basket wire 12 and the connector 13 can be smoothly separated.

[0063] The first basket wire 11 and the second basket wire 12 can be respectively arranged in the first hole 131, the second hole 132 and the third hole 133 by riveting and extrusion. The riveting increases the connection strength between the basket wire and the connecting piece 13, and for larger stones 9 that cannot pass through the nipple, a certain traction force (the traction force is less than the traction force that separates the second basket wire 12 from the connecting piece 13) is applied to the basket 1 to crush the stones.

[0064] There is one first basket wire 11, there are multiple second basket wires 12, and the third hole 133 may have multiple corresponding to the second basket wire 12, or only one. When there are multiple third holes 133, the multiple basket wires are respectively placed in the corresponding third holes 133; when there is one third hole 133, the multiple basket wires are all placed in the third hole 133. In this embodiment, there are two second basket wires 12, and there is one third hole 133, which is a slot-shaped hole.

[0065] Furthermore, the first basket wire 11 and the second basket wire 12 are metal wires, preferably nickel-titanium wires.

[0066] The mesh basket 1 further comprises a metal end cap 14 sleeved on the outside of the connecting piece 13 .

[0067] like Figures 6 to 10As shown, the push-pull assembly includes a booster tube 5, a cable 6 and a fixed tube 7, wherein the proximal end of the cable 6 is inserted into the distal end of the booster tube 5 and fixed by laser welding, the distal end of the cable 6 is inserted into the proximal end of the fixed tube 7 and fixed by laser welding, and the proximal ends of the first basket wire 11 and the second basket wire 12 are inserted into the distal end of the fixed tube 7 and fixed by riveting and extrusion. As a preferred embodiment, Figure 7 and Figure 8 As shown, the distal end and the proximal end of the fixed tube 7 have a first groove 71 and a second groove 72 respectively, and the first groove 71 has a plurality of first grooves 71 arranged corresponding to the proximal ends of the first basket wire 11 and the proximal ends of the second basket wire 12, and the plurality of first grooves 71 are evenly arranged around the axis of the fixed tube 7. In this embodiment, there are four first grooves 71, and there is one second groove 72 which is coaxial with the fixed tube 7.

[0068] The stone-taking basket 1 also includes a cluster tube 8 (such as Figure 6 and Figure 8 As shown), the cluster tube 8 is located between the connecting piece 13 and the fixed tube 7 and is arranged close to the fixed tube 7. The first basket wire 11 and the second basket wire 12 are fixed in the cluster tube 8 by a riveting and extrusion process.

[0069] The handle 4 includes a handle body 41 having a handle head 42 at the proximal end and a sliding handle 43. The handle body 41 is provided with a slide groove 44 extending along its length direction. The sliding handle 43 is slidably arranged on the handle body 41 and can slide along the extension direction of the slide groove 44. The proximal end of the push-pull assembly is fixedly connected to the sliding handle 43. In response to the sliding handle 43, the push-pull assembly can move along the axial direction of the sheath tube 2. The sheath tube 2 is a spring tube, which is connected to the handle body 41 through the three-way assembly 3.

[0070] The working principle of the above-mentioned stone-taking basket is:

[0071] In the initial state, the basket 1 is retracted in the sheath 2 .

[0072] During operation, the sliding handle 43 is pushed to make the sliding handle 43 move toward the distal end along the extension direction of the slide groove 44, and the pushing component drives the basket 1 to move toward the distal end. The basket 1 extends from the distal end of the sheath tube 2. The basket wire expands and forms a basket structure under the action of its own shape-retaining force to trap the stone 9. When the stone 9 is trapped, the sliding handle 43 is pulled in the opposite direction to make the push-pull component drive the basket 1 to withdraw, thereby removing the stone 9. When encountering a larger stone 9 that cannot pass through the nipple, increase the pulling force applied to the sliding handle 43. After the basket 1 crushes the stone 9, pull the sliding handle 43 again to remove it. When incarceration occurs, gradually increase the pulling force applied to the sliding handle 43 until the second basket wire 12 is disengaged from the connecting piece 13 ( Fig.13 and Fig.14 As shown), the basket 1 can slide out of the stone 9 of the block.

[0073] The above-mentioned stone-taking basket has at least the following advantages:

[0074] (1) When a stone 9 is stuck in the stone removal basket, the distal end of the second basket wire 12 can be detached from the connecting piece 13, thereby achieving the purpose of releasing the stone 9. Due to the obstruction of the bent portion 111, the connecting piece 13 will not be pulled off even if it is subjected to excessive force, thereby avoiding the risk of the connecting piece 13 falling off and remaining in the human body.

[0075] (2) The distance between the distal end of the bent portion 111 and the connecting piece 13 of the stone retrieval basket is set so that the second basket wire 12 can be smoothly detached from the connecting piece 13.

[0076] (3) The stone removal basket can not only remove small stones 9, but also crush larger stones 9 that cannot pass through the nipple before removing them, thus having the functions of stone removal and stone crushing in one.

[0077] (4) The stone-removing basket has a simpler structure, is more convenient to operate, and is highly safe.

[0078] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A stone removal basket, comprising a sheath tube, a push-pull assembly inserted in the sheath tube, and a basket connected to the distal end of the push-pull assembly, wherein the basket is extended or retracted at the distal end of the sheath tube under the traction of the push-pull assembly, and characterized in that: The basket comprises a first basket wire, a second basket wire and a connecting piece, the first basket wire is bent in the middle at its distal end to form a bent portion, both ends of the bent portion pass through the connecting piece respectively and are spaced apart, and the proximal end of the first basket wire is connected to the push-pull assembly; The proximal end of the second basket wire is connected to the push-pull assembly and the distal end thereof is placed in the connecting member. Under the traction force of the push-pull assembly, the distal end of the second basket wire can be separated from the connecting piece, and the connecting piece is blocked by the bent portion and remains connected to the first basket wire.

2. The stone-removing basket according to claim 1, characterized in that: The connecting piece has a first hole and a second hole arranged at an interval, one end of the bent portion penetrates from the distal end of the first hole and passes out from the proximal end of the first hole, and the other end penetrates from the distal end of the second hole and passes out from the proximal end of the second hole.

3. The stone-removing basket according to claim 2, characterized in that: The first hole and the second hole are through holes that penetrate the connecting member along the axial direction of the connecting member.

4. The stone-removing basket according to any one of claims 1 to 3, characterized in that: There is a certain distance between the distal end of the bent portion and the connecting member, and the distance is greater than or equal to the length of the second basket wire placed in the connecting member.

5. The stone-removing basket according to claim 1, characterized in that: The connecting member has a third hole, and the distal end of the second basket wire is riveted into the third hole.

6. The stone-removing basket according to claim 5, characterized in that: The third hole is a blind hole extending along the axial direction of the connecting piece, and the depth of the third hole is 1 / 3 to 2 / 3 of the length of the connecting piece.

7. The stone-removing basket according to claim 1, characterized in that: The number of the first basket wire is one, and the number of the second basket wires is a plurality.

8. The stone-removing basket according to claim 7, characterized in that: The number of the second basket wires is two.

9. The stone-removing basket according to any one of claims 1, 7 and 8, characterized in that: The first basket wire and the second basket wire are nickel-titanium wires.

10. The stone-removing basket according to claim 1, characterized in that: The push-pull assembly includes a booster tube, a cable and a fixed tube, the two ends of the cable are respectively connected to the distal end of the booster tube and the proximal end of the fixed tube, and the proximal ends of the first basket wire and the second basket wire are connected to the distal end of the fixed tube; and / or, The stone removal basket also includes a handle and a three-way assembly, wherein the handle includes a handle body and a sliding handle which can be slidably arranged on the handle body along the length direction of the handle body; the proximal end and the distal end of the three-way assembly are respectively connected to the handle body and the sheath tube, and the proximal end of the push-pull assembly is fixedly connected to the sliding handle. In response to the sliding handle, the push-pull assembly moves along the axial direction of the sheath tube.

Images