An instrument for removing bile duct stones during ERCP surgery

Abstract

The present invention belongs to the technical field of medical devices, and specifically relates to a bile duct stone removal instrument in ERCP surgery, which is mainly used for removing gallstones in ERCP surgery; it mainly comprises: a main branch, having a first proximal end and a first distal end opposite to each other; a push tube, having a second proximal end and a second distal end opposite to each other, wherein the push tube is sleeved on the outer side of the main branch; a stone removal part, which is arranged around the first proximal end of the main branch and connected to the second proximal end, wherein the stone removal part is configured such that when the second proximal end moves toward the first proximal end, the stone removal part is partially away from the outer wall of the main branch to present an expanded state, and when the second proximal end moves toward the direction away from the first proximal end, the stone removal part is partially close to the outer wall of the main branch to present a contracted state; it mainly solves the problem that the existing stone removal basket or stone removal balloon cannot grasp the stones well, resulting in the need for repeated operations, thereby prolonging the operation time and increasing the pain of the patient.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a bile duct stone removal device in ERCP surgery. Background Art

[0002] Biliary stones are a very common surgical disease. There are currently two main methods for treating bile duct stones, one is surgical biliary stone removal, and the other is endoscopic stone removal. Surgical biliary stone removal can be applied to almost all cases of bile duct stones, and the stone removal is relatively thorough, but at the same time the surgical trauma is relatively large and the recovery is slow. With the advancement of endoscopic technology and equipment, more and more patients are beginning to accept endoscopic minimally invasive stone removal, which is characterized by less trauma, faster recovery, and less pain.

[0003] Endoscopic minimally invasive lithotripsy is mainly divided into two categories: conventional choledochoscopy after biliary surgery and ERCP. The tools used are mainly stone removal baskets or stone removal balloons. However, when it comes to smaller stones in the obviously dilated common bile duct, since the stones float in the bile, there is a problem of not being able to grasp the stones well when using stone removal baskets or stone removal balloons, resulting in the need for repeated operations, which prolongs the operation time and increases the patient's pain.

[0004] In view of the above problems, the present invention provides a bile duct stone removal instrument during ERCP surgery. Summary of the invention

[0005] In order to overcome the problems raised in the background technology, the present invention adopts the following technical solutions:

[0006] A bile duct stone removal device during ERCP surgery, comprising:

[0007] A main branch tube having a first proximal end and a first distal end opposite to each other;

[0008] A push tube having a second proximal end and a second distal end opposite to each other, wherein the push tube is sleeved on the outside of the main branch tube;

[0009] A handle connected to the main branch pipe and the push tube, and the second distal end of the push tube is located in the handle;

[0010] a pushing structure connected to the handle, the pushing structure abutting against the second distal end of the pushing tube, the pushing structure being configured to be rotatable relative to the handle, wherein when the pushing structure rotates, the second proximal end moves toward the first proximal end or away from the first proximal end;

[0011] The stone removal part is arranged around the first proximal end of the main branch and connected to the second proximal end, wherein the stone removal part is configured so that when the second proximal end moves toward the first proximal end, the stone removal part partially moves away from the main branch to present an expanded state, and when the second proximal end moves away from the first proximal end, the stone removal part partially moves close to the main branch to present a contracted state.

[0012] In some embodiments of the present application, the push structure includes:

[0013] A rotating member, the rotating member is rotatably connected to the handle, wherein the rotating member has a first rotation direction and a second rotation direction;

[0014] a linkage member connected to the rotating member, wherein the second distal end is located in the linkage member, and when the rotating member rotates in the first rotation direction or the second rotation direction, the linkage member moves along the extension direction of the rotation axis of the rotating member;

[0015] A spring is arranged in the linkage member, one end of the spring abuts against the second distal end, so that the second distal end always abuts against the inner side of the linkage member when the linkage member moves, wherein when the linkage member moves, the second distal end moves synchronously with the linkage member under the action of the spring.

[0016] Furthermore, the handle has a first chamber, and when the rotating member rotates in a first rotation direction, the linkage member moves into the first chamber along the extension direction of the rotating axis of the rotating member; when the rotating member rotates in a second rotation direction, the linkage member moves out of the first chamber along the extension direction of the rotating axis of the rotating member.

[0017] Furthermore, a accommodating cavity is formed inside the linkage member, wherein one end of the spring extends into the accommodating cavity, the other end of the spring abuts against the bottom end surface of the first chamber, and the second distal end of the push tube is located in the accommodating cavity.

[0018] Furthermore, the inner wall of the rotating part is provided with an internal thread, and the outer wall of the linkage part is provided with an external thread, and the internal thread is meshed with the external thread, wherein the linkage part also has a limiting section, and the limiting section is constructed so that when the rotating part is rotated, the linkage part only translates along the extension direction of the rotation axis of the rotating part.

[0019] Preferably, the cross-sectional shape of the limiting segment is the same as the cross-sectional shape of the first chamber, wherein the cross-sectional shape of the first chamber is rectangular.

[0020] In some embodiments of the present application, the invention further comprises: an outer sleeve, the outer sleeve being sleeved on the outer side of the push tube, wherein the outer sleeve has a movable end, and the movable end can move between a first position and a second position relative to the handle;

[0021] When the movable end moves to the first position, the first proximal end and the second proximal end are gradually received in the outer sleeve.

[0022] When the movable end moves from the first position to the second position, the first proximal end and the second proximal end gradually extend out of the outer sleeve.

[0023] Preferably, the outer wall of the outer sleeve is covered with a hydrophilic coating.

[0024] Furthermore, the handle also has a second chamber, and the movable end of the outer sleeve is slidably configured in the second chamber, wherein the handle also has a driving structure, and the driving structure and the handle are slidably connected, wherein the driving structure is connected to the outer sleeve, and the driving structure is constructed to be able to push the movable end of the outer sleeve to move between a first position and a second position when moving.

[0025] In some embodiments of the present application, the stone removal part forms an arc-shaped mesh surface in an expanded state.

[0026] Preferably, the stone removal part is braided from nickel-titanium memory alloy wires.

[0027] In some embodiments of the present application, a traction wire is further included, which connects the stone removal part with the second proximal end of the pushing tube, wherein a plurality of traction wires are provided, one end of each traction wire is fixedly connected to the second proximal end, and the other end of each traction wire is connected to the edge of the stone removal part.

[0028] Furthermore, a plurality of traction wires are distributed circumferentially around the axis of the pushing tube at the second proximal end, and the distances between the connection points of adjacent traction wires and the stone removal part are the same.

[0029] Beneficial effects of the present invention:

[0030] 1. By setting a handle, a main branch, a push tube and a stone removal part, when in use, the push tube is controlled by the handle to move relative to the main branch, so that the stone removal part can be switched between a contracted state and an expanded state in the patient's bile duct, so that the stone removal part can be expanded in the patient's bile duct, and stones with smaller particles and stones free in the patient's bile duct can be removed;

[0031] 2. By setting up a pushing structure, while controlling the conversion of the stone removal part between the retracted state and the expanded state, the expanded diameter of the stone removal part can also be controlled, so that the stone removal part can expand to a suitable diameter in the patient's bile duct, thereby avoiding damage to the patient's bile duct during the process of removing stones.

[0032] 3. While controlling the expansion of the stone removal part, the patient's bile duct diameter can also be judged by the rotation amount of the pushing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the handle structure of the present invention;

[0035] Figure 3 This is a schematic diagram of the first proximal position structure of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the stone removal part of the present invention in an expanded state;

[0037] Figure 5 This is a schematic diagram of the push structure of the present invention;

[0038] Figure 6 This is a cross-sectional view of the internal structure of the handle of the present invention;

[0039] Figure 7 This is a schematic diagram of the position structure of the sliding member of the present invention;

[0040] Figure 8 This is a schematic diagram of the chute position structure of the present invention;

[0041] Fig. 9 This is a schematic diagram of the structure after the positioning protrusion and the positioning portion are combined in the present invention;

[0042] Fig.10 This is a schematic diagram of the outer sleeve structure of the present invention;

[0043] Fig.11 It is a schematic diagram showing the structure of the stone removal part of the present invention in comparison between the expanded state and the retracted state;

[0044] Fig.12 This is a schematic diagram of the structure of the stone taking part of the present invention in a folded state;

[0045] Fig.13 This is a schematic diagram of the structure of the present invention after being inserted into the guide wire;

[0046] Fig.14 This is a schematic diagram of the structure of the stone removal part in the expanded state of the present invention;

[0047] In the figure, 1, main branch; 11, first proximal end; 12, first distal end; 2, push tube; 21, second proximal end; 22, second distal end; 23, traction wire; 3, stone removal part; 4, handle; 41, first chamber; 42, second chamber; 43, slide groove; 431, positioning groove; 432, elastic sheet; 5, rotating part; 51, linkage part; 511, threaded section; 512, limiting section; 52, spring; 53, sliding part; 54, positioning protrusion; 6, outer sleeve; 7, guide wire. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present invention are described clearly and completely below through specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Figure 1 —5 shows the main technical content of this embodiment. This specific embodiment provides a bile duct stone removal device during ERCP surgery, which includes:

[0050] The main branch pipe 1 has a first proximal end 11 and a first distal end 12 opposite to each other;

[0051] The push tube 2 has a second proximal end 21 and a second distal end 22 opposite to each other, wherein the push tube 2 is sleeved on the outer wall of the main branch tube 1;

[0052] A handle 4 is connected to the main branch pipe 1 and the push pipe 2, and the second distal end 22 of the push pipe 2 is located in the handle 4;

[0053] A pushing structure is connected to the handle 4, and the pushing structure abuts against the second distal end 22 of the pushing tube 2, wherein the pushing structure has a first rotation direction and a second rotation direction, and when the pushing structure rotates in the first rotation direction, the second proximal end 21 moves toward the first proximal end 11, and when the pushing structure rotates in the second rotation direction, the second proximal end 21 moves away from the first proximal end 11;

[0054] The stone removal part 3 is arranged around the first proximal end 11 of the main branch 1 and connected to the second proximal end 21, wherein the stone removal part 3 is configured so that when the second proximal end 21 moves toward the first proximal end 11, the part of the stone removal part 3 moves away from the outer wall of the main branch 1 to present an expanded state, and when the second proximal end 21 moves away from the first proximal end 11, the part of the stone removal part 3 moves close to the outer wall of the main branch 1 to present a contracted state.

[0055] During use, the guide wire 7 pre-inserted into the patient's body is passed from the first proximal end 11 into the main branch 1, and the main branch 1, the pushing tube 2 and the stone removal part 3 in the retracted state are pushed into the patient's bile duct along the guide wire 7. After the stone removal part 3 passes over the stone; the handle 4 is held, and the pushing structure is rotated in a first rotation direction, and the second distal end 22 is axially moved in the handle 4, so that the second proximal end 21 is close to the first proximal end 11. At this time, the stone removal part 3 is partially away from the outer wall of the main branch 1 to present an expanded state; the operator drags the expanded stone removal part 3 through the handle 4 at the external end of the patient's body to move in the bile duct, so as to capture the patient's bile duct stones, and then the pushing structure is rotated in the second rotation direction, so that the second proximal end 21 is away from the first proximal end 11. At this time, the stone removal part 3 is partially close to the outer wall of the main branch 1 to present a retracted state, and the stone is removed by pulling back the retracted stone removal part 3.

[0056] refer to Figure 5 —7. In the present embodiment, the pushing structure comprises: a rotating member 5, a linkage member 51 and a spring 52, wherein the rotating member 5 is rotatably connected to the handle 4, the first rotation direction and the second rotation direction are two rotation directions of the rotating member 5, the linkage member 51 is connected to the rotating member 5, when the rotating member 5 rotates in the first rotation direction or the second rotation direction, the linkage member 51 moves along the extension direction of the rotation axis of the rotating member 5; the spring 52 is arranged on the inner side of the linkage member 51, and one end of the spring 52 abuts against the second distal end 22 of the pushing tube 2, so that the second distal end 22 of the pushing tube 2 always abuts against the inner side of the linkage member 51; preferably, the spring 52 is arranged around the outer wall of the pushing tube 2, more specifically, the handle 4 has a first cavity Chamber 41, when the rotating member 5 rotates in the first rotation direction, the linkage member 51 moves into the first chamber 41 along the extension direction of the rotation axis of the rotating member 5, and applies force to the second distal end 22 of the pushing tube 2, so that the pushing tube 2 moves along the main branch 1, and at the same time, the spring 52 is compressed, so that the second proximal end 21 approaches the first proximal end 11, and the stone removal part 3 gradually changes from the retracted state to the expanded state; when the rotating member 5 rotates in the second rotation direction, the linkage member 51 moves out of the first chamber 41 along the extension direction of the rotation axis of the rotating member 5, the spring 52 expands with the movement of the linkage member 51, and drives the pushing tube 2 to move, so that the second proximal end 21 is away from the first proximal end 11; at this time, the stone removal part 3 changes from the expanded state to the retracted state.

[0057] More specifically, a accommodating cavity is formed inside the linkage member 51, wherein one end of the spring 52 extends into the accommodating cavity, the other end of the spring 52 abuts against the bottom end surface of the first chamber 41, and the second distal end 22 of the push tube 2 is located in the accommodating cavity.

[0058] refer to Figure 1—2 and 5-7, in this embodiment, the rotating member 5 and the linkage member 51 are matched with each other by threads. Specifically, the rotating member 5 has a threaded hole, and the linkage member 51 has: a threaded section 511 and a limiting section 512. The threaded section 511 matches with the threaded hole, and the limiting section 512 is always located in the first chamber 41. When the rotating member 5 rotates in the first rotation direction, the threaded section 511 moves toward the first chamber 41, and under the action of the limiting section 512, the threaded section 511 does not rotate synchronously with the connecting member. At this time, the linkage member 51 performs a translational motion as a whole, thereby realizing Now push the push tube 2 along the main branch 1. When in use, after the basket passes over the stones in the patient's bile duct along the guide wire 7, the rotating member 5 is rotated in the first rotation direction. At this time, the linkage member 51 moves into the first chamber 41 under the action of the limiting section 512, and pushes the push tube 2 to move along the main branch 1. At this time, the second proximal end 21 approaches the first proximal end 11, and the stone removal part 3 is converted from a retracted state to an expanded state. At the same time, the size of the expansion of the stone removal part 3 can also be controlled by the rotation amount of the rotating member 5, so that it is suitable for stone removal operations in bile ducts of different diameters.

[0059] More specifically, the cross-sectional shape of the limiting segment 512 is the same as the cross-sectional shape of the first chamber 41, wherein the cross-sectional shape of the first chamber 41 may be rectangular; when the rotating member 5 rotates, the limiting segment 512 is restricted by the inner wall of the first chamber 41 and does not rotate with the rotating member 5, thereby realizing that the linkage member 51 only performs translational motion.

[0060] In this embodiment (not shown), an indicator mark is provided on the outer wall of the rotating member 5, and a scale groove is provided on the outer wall of the handle 4, wherein when the rotating member 5 rotates in the first rotation direction or the second rotation direction, the indicator mark is indicated on the scale groove, so that the operator can clearly know the expanded diameter of the stone removal part 3, and thereby the inner diameter of the affected bile duct can be obtained during the stone removal operation for the patient, so as to determine whether the patient's bile duct has expansion or stenosis problems.

[0061] Alternatively, the rotating member 5 is configured to expand the stone removal portion 3 by 1 mm per rotation.

[0062] refer to Figure 2—4, in this embodiment, it also includes an outer sleeve 6, the outer sleeve 6 is sleeved on the outer wall of the push tube 2, and one end of the outer sleeve 6 is connected to the handle 4, the outer sleeve 6 also has a movable end, wherein the movable end is located in the handle 4, and has a first position and a second position relative to the handle 4, wherein the movable end can move between the first position and the second position, when the movable end moves to the first position, the first proximal end 11 and the second proximal end 21 are gradually received in the outer sleeve 6, so that when in use, the outer sleeve 6 and the push tube 2 can be moved along the guide wire 7. 2 and the main branch 1 are pushed into the patient's bile duct. At this time, the stone removal part 3 is located in the outer sleeve 6, so that when the stone removal part 3 is pushed into the patient's body, the stone removal part 3 in the retracted state will not directly rub against the inner wall of the patient's bile duct, thereby achieving the effect of protecting the patient's bile duct mucosal layer; when the movable end of the outer sleeve 6 moves from the first position to the second position, the first proximal end 11 and the second proximal end 21 gradually extend out of the outer sleeve 6, and the stone removal part 3 is controlled by the pushing structure of the handle 4 to switch from the retracted state to the expanded state, and then the stone removal operation is performed.

[0063] Preferably, the outer wall of the outer sleeve 6 is covered with a hydrophilic coating, for example, a hydrophilic coating compounded with a polymer PVP (polyvinyl pyrrolidone), or a PVP hydrophilic coating prepared by free radical polymerization of vinyl pyrrolidone monomer.

[0064] refer to Figure 1 and Figure 6 —7, more specifically, the handle 4 also has a second chamber 42, and the movable end of the outer sleeve 6 is slidably configured in the second chamber 42, wherein the handle 4 also has a driving structure, and the driving structure and the handle 4 are slidably connected, wherein the driving structure is connected to the outer sleeve 6, and when the driving structure moves, it can push the movable end of the outer sleeve 6 to move between the first position and the second position, more specifically, a slide groove 43 is opened on the outer wall of the handle 4 toward the second chamber 42, and the first position and the second position are the two ends of the slide groove 43, wherein the driving structure is at least partially located in the slide groove 43, and the driving structure moves along the length extension direction of the slide groove 43.

[0065] refer to Figure 6 —9. In the present embodiment, the driving structure includes: a sliding member 53, which is slidably disposed in the slide groove 43 and connected to the outer sleeve 6. When the sliding member 53 moves in the slide groove 43, it drives the movable end of the outer sleeve 6 to move between the first position and the second position. More specifically, the sliding member 53 has a connecting portion and a pushing portion, wherein the connecting portion is located in the second chamber 42, the movable end of the outer sleeve 6 passes through the connecting portion, and the pushing portion is located outside the second chamber 42. When in use, force is applied to the pushing portion to cause the connecting portion to move in the second chamber 42.

[0066] More specifically, the driving structure also includes a positioning protrusion 54, which is arranged at one end of the pushing part close to the second position, and a positioning part is arranged in the slide groove 43, and the positioning part is arranged at one end of the slide groove 43 corresponding to the second position, wherein when the driving structure moves to the second position, the positioning protrusion 54 enters into the positioning part, so that the pushing part and the positioning part form a connection relationship; thereby, the position of the pushing part after movement is fixed; at this time, the first proximal end 11 and the second proximal end 21 are always located outside the outer sleeve 6; thereby facilitating the expansion of the stone removal part 3.

[0067] refer to Figure 6 —10. In the present embodiment, the positioning portion comprises: a positioning groove 431 provided on the inner wall of the slide groove 43 for the positioning protrusion 54 to be inserted into, and an elastic sheet 432 installed in the positioning groove 431 so that the positioning protrusion 54 will not be separated from the positioning groove 431 when in use; wherein the positioning groove 431 comprises a first side wall and a second side wall which are arranged in a mirror image with each other, each side wall is provided with an elastic sheet 432, and the two elastic sheets 432 are also arranged in a mirror image, and there are clamping grooves on both sides of the positioning protrusion 54. When the positioning protrusion 54 is inserted into the positioning groove 431, one end of the positioning protrusion 54 acts on the two elastic sheets 432, so that the two elastic sheets 432 are deformed until the clamping groove moves to the position of the elastic sheet 432. When the tool is removed from the patient's body, the sliding member 53 can be pushed toward the first position. At this time, the elastic sheet 432 is reset and enters the card slot, so that the positioning protrusion 54 is fixed in the positioning slot 431; when it is used, the sliding member 53 is pushed to move to the second position until the positioning protrusion 54 is fixed in the positioning slot 431; at this time, the stone removal part 3 is located outside the outer sleeve 6, and during use, the outer sleeve 6 will not change its position due to the operator's operation due to the cooperation between the positioning protrusion 54 and the elastic sheet 432; when the instrument is withdrawn from the patient's body, the sliding member 53 can be pushed toward the first position. At this time, the elastic sheet 432 is deformed by force and disengaged from the card slot, so that the outer sleeve 6 will receive the stone removal part 3 again to avoid scratching the patient's bile duct wall when the stone removal part 3 is withdrawn from the patient's bile duct.

[0068] More specifically, the second chamber 42 is communicated with the first chamber 41 , wherein the first proximal end 11 of the main branch pipe 1 and the second proximal end 21 of the push tube 2 both pass through the second chamber 42 into the first chamber 41 . Specifically, the first proximal end 11 of the main branch pipe 1 is connected to the rotating member 5 .

[0069] In the present embodiment, the stone removal part 3 is woven from nickel-titanium memory alloy wire, wherein the stone removal part 3 forms an arc-shaped mesh surface in the expanded state. When in use, the arc-shaped mesh surface formed by the stone removal part 3 in the expanded state forms a tangent relationship with the inner wall of the patient's bile duct, thereby avoiding the edge part of the stone removal part 3 from damaging the mucosal layer of the patient's bile duct when the expanded stone removal part 3 is pulled back. At the same time, the edge part of the stone removal part 3 will not be stuck on the wall of the patient's bile duct, so as to ensure that the stone removal part 3 can move smoothly in the patient's bile duct when the stone removal part 3 is pulled back.

[0070] refer to Figure 2 —5 and Fig.11 —14. In the present embodiment, it also includes a traction wire 23, which connects the stone removal part 3 with the second proximal end 21 of the pushing tube 2, wherein a plurality of traction wires 23 are provided, one end of each traction wire 23 is fixedly connected to the second proximal end 21, and the other end of each traction wire 23 is connected to the edge of the stone removal part 3. More specifically, a plurality of traction wires 23 are circumferentially distributed around the axis of the pushing tube 2 at the second proximal end 21, and the distances between the connection points of adjacent traction wires 23 and the stone removal part 3 are the same; when the stone removal part 3 is in a retracted state, the second proximal end 21 is away from the first proximal end 11, and at this time, each traction wire 23 is in a stretched state, so that the stone removal part 3 cannot be converted to an expanded state by relying on the characteristics of its own material. After the second proximal end 21 approaches the first proximal end 11, the distance difference between the second proximal end 21 and the first proximal end 11 is reduced. At this time, the stone removal part 3 expands to a certain extent according to the movement amount of the second proximal end 21 and relying on the characteristics of its own material, thereby realizing the conversion of the stone removal part 3 to an expanded state.

[0071] More specifically, each traction wire 23 is connected to the stone removal part 3 by welding. More preferably, the number of traction wires 23 is at least two.

[0072] refer to Figure 4 —6. In the present embodiment, the first distal end 12 of the main branch 1 is connected to the rotating member 5 after passing through the first chamber 41 and the second chamber 42 of the handle 4 in sequence. When in use, the guide wire 7 pre-inserted into the patient's body is passed from the first proximal end 11 into the main branch 1, and then passed out from the first distal end 12, so that the handle 4 can push the stone removal part 3 to the target area along the guide wire 7.

[0073] The method of using the present invention:

[0074] 1. Insert the guide wire pre-placed in the patient's body from the first proximal end into the main branch. At this time, the stone removal part is located in the outer sleeve. The operator pushes the main branch, the push tube and the stone removal part in the retracted state into the patient's bile duct along the guide wire;

[0075] 2. After passing over the bile duct stone, the driving structure is pushed to move in the slide slot, so that the movable end of the outer sleeve moves from the first position to the second position. At this time, the first proximal end of the main branch, the second proximal end of the push tube and the stone removal part are all extended out of the outer sleeve;

[0076] 3. Rotate the rotating member in the first rotation direction so that the second proximal end of the push tube approaches the first proximal end of the main branch tube. At this time, the stone removal part gradually changes from a contracted state to an expanded state until the stone removal part expands to a suitable diameter.

[0077] 4. The operator uses the handle at the external end of the patient's body to drag the expanded stone removal part to move in the bile duct, so as to capture the patient's bile duct stones, and then rotates the pushing structure in a second rotation direction to make the second proximal end move away from the first proximal end. At this time, the stone removal part partially approaches the outer wall of the main branch to present a contracted state, and the stone is removed by pulling back the contracted stone removal part.

[0078] The above embodiments are only used to understand the present invention. It should be noted that, for those skilled in the art, several improvements can be made to the present invention without departing from the principles of the present invention, and these improvements will also fall within the scope of protection of the claims of the present invention.

Claims

1. A bile duct stone removal device during ERCP surgery, characterized in that: It includes: A main branch tube having a first proximal end and a first distal end opposite to each other; A push tube having a second proximal end and a second distal end opposite to each other, wherein the push tube is sleeved on the outside of the main branch tube; A handle connected to the main branch pipe and the push tube, and the second distal end of the push tube is located in the handle; a pushing structure connected to the handle, the pushing structure abutting against the second distal end of the pushing tube, the pushing structure being configured to be rotatable relative to the handle, wherein when the pushing structure rotates, the second proximal end moves toward the first proximal end or away from the first proximal end; a stone removal portion, arranged around the first proximal end of the main branch and connected to the second proximal end, wherein the stone removal portion is configured such that when the second proximal end moves toward the first proximal end, the stone removal portion partially moves away from the main branch to present an expanded state, and when the second proximal end moves away from the first proximal end, the stone removal portion partially moves toward the main branch to present a retracted state; The push structure includes: A rotating member, the rotating member is rotatably connected to the handle, wherein the rotating member has a first rotation direction and a second rotation direction; a linkage member connected to the rotating member, wherein the second distal end is located in the linkage member, and when the rotating member rotates in the first rotation direction or the second rotation direction, the linkage member moves along the extension direction of the rotation axis of the rotating member; a spring, disposed in the linkage member, one end of the spring abutting against the second distal end, so that the second distal end always abuts against the inner side of the linkage member when the linkage member moves, wherein when the linkage member moves, the second distal end moves synchronously with the linkage member under the action of the spring; The handle has a first chamber, and when the rotating member rotates in a first rotation direction, the linkage member moves into the first chamber along the extension direction of the rotation axis of the rotating member; when the rotating member rotates in a second rotation direction, the linkage member moves out of the first chamber along the extension direction of the rotation axis of the rotating member; A receiving cavity is formed inside the linkage member, wherein one end of the spring extends into the receiving cavity, the other end of the spring abuts against the bottom end surface of the first chamber, and the second distal end of the push tube is located in the receiving cavity; The inner wall of the rotating member is provided with an internal thread, and the outer wall of the linkage member is provided with an external thread, and the internal thread is meshed with the external thread, wherein the linkage member further has a limiting section, and the limiting section is configured to make the linkage member translate only along the extending direction of the rotation axis of the rotating member when the rotating member is rotated; The cross-sectional shape of the limiting section is the same as the cross-sectional shape of the first chamber, wherein the cross-sectional shape of the first chamber is a rectangle; It also includes: an outer sleeve, the outer sleeve is sleeved on the outer side of the push tube, wherein the outer sleeve has a movable end, and the movable end can move between a first position and a second position relative to the handle; When the movable end moves to the first position, the first proximal end and the second proximal end are gradually received in the outer sleeve. Wherein, when the movable end moves from the first position to the second position, the first proximal end and the second proximal end gradually extend out of the outer sleeve; The handle also has a second chamber, and the movable end of the outer sleeve is slidably configured in the second chamber, wherein the handle also has a driving structure, and the driving structure and the handle are slidably connected, wherein the driving structure is connected to the outer sleeve, and the driving structure is constructed to be able to push the movable end of the outer sleeve to move between a first position and a second position when moving.

2. The bile duct stone removal device during ERCP surgery according to claim 1, characterized in that: The stone removal part forms an arc-shaped mesh surface in an expanded state.

3. The bile duct stone removal device during ERCP surgery according to claim 1, characterized in that: It also includes a traction wire, which connects the stone removal part with the second proximal end of the pushing tube, wherein a plurality of traction wires are provided, one end of each traction wire is fixedly connected to the second proximal end, and the other end of each traction wire is connected to the edge of the stone removal part.

4. The bile duct stone removal device during ERCP surgery according to claim 3, characterized in that: A plurality of traction wires are distributed circumferentially around the axis of the pushing tube at the second proximal end, and the distances between the connection points of adjacent traction wires and the stone removal part are the same.

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