An anti-impaction stone extractor

Abstract

The present application relates to the technical field of medical devices, in particular to a kind of anti-embedded calculus extractor, comprising: outer sheath, outer sheath handle, inner handle, traction wire, memory alloy wire and net bag, the outer sheath is connected with the outer sheath handle, the inner handle is slidingly connected on the outer sheath handle, the traction wire is connected with the inner handle and is drawn out from the outer sheath handle and the outer sheath, in the process of taking out calculus, use to tighten net bag, reduce net bag volume, lubricate net bag and calculus and bile duct, provide lubricating effect and form the mode of double-acting force of internal push and external pull, when net bag and calculus are embedded, timely remedy, as far as possible to offset the embedded force, smoothly take out calculus, in addition, change traditional fixed structure net bag, ensure that when embedded force cannot be overcome, resulting in calculus basket embedded cannot be taken out, directly disperse net bag and pull out, prevent instrument from being stranded in bile duct, reduce the risk of surgery, improve the reliability of surgery.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an anti-impact stone removal device. Background Technology

[0002] In minimally invasive surgery for biliary or urinary system stones, the stone retrieval basket is a core surgical instrument. The typical procedure is as follows: under endoscopic guidance, the stone retrieval basket, contained within an outer sheath, is advanced to the location of the stone and then released, allowing the basket to open within the target lumen. The basket is then manipulated to retrieve the stone, and by pulling it back, it contracts, thus grasping and removing the stone.

[0003] However, in clinical practice, when encountering large stones, the stone may become stuck in the basket wires during stone retrieval, making it impossible to remove the basket. When the basket and stone become stuck in the bile duct, it is an emergency that can cause great distress and surgical risks to the surgeon. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-impact stone extractor to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides an anti-impact stone remover, comprising: an outer sheath tube, an outer sheath tube handle, an inner handle, a traction wire, a shape memory alloy wire, and a net bag. The outer sheath tube is connected to the outer sheath tube handle, the inner handle is slidably connected to the outer sheath tube handle, and the traction wire is connected to the inner handle and extends through the outer sheath tube handle and the outer sheath tube. The shape memory alloy wire is disposed on the traction wire and is threaded onto the edge of the opening of the cone-shaped net bag; The shape memory alloy wire is used to open the opening of the net bag. When the inner handle is pushed or pulled, the net bag is pulled along the axial displacement of the outer sheath tube by the traction wire, so that it enters and exits the outer sheath tube.

[0006] Furthermore, a movable ring is fitted onto the traction wire at a position on the side of the net facing the inner handle. The movable ring is connected to a patch plate, which is attached to the traction wire. The movable ring is connected to a pull cable, which passes through the outer sheath and the outer sheath handle and is connected to a first linear lever on the inner handle. One end of the shape memory alloy wire is connected to the traction wire, and the other end is connected to the mounting plate; When the first linear lever is pulled back, the movable ring can be pulled along the traction wire via the cable.

[0007] Furthermore, the side of the patch is provided with a miniature nozzle, which is angled towards the net. The cable is internally continuous and extended to pass through the movable ring and the plate to connect to the micro nozzle. The portion of the cable extending out of the outer sheath handle is connected to an external biocompatible lubricant supply source via a connector.

[0008] Furthermore, the traction wire extends forward over the net, so that the end of the traction wire protrudes out of the net; A guide wire is movably inserted inside the outer sheath and the handle of the outer sheath, and the guide wire can pass through the outer sheath to the front of the net.

[0009] Furthermore, a rubber airbag sleeve is covered on the traction wire at the position in front of the net bag. The rubber airbag sleeve is connected to an inflation tube, which extends along the traction wire, passes through the outer sheath tube, and the handle of the outer sheath tube connects to an external air source.

[0010] Furthermore, the net is woven from a single continuous flexible filament, and each node of the net can slide. The end of the flexible braided yarn is designed as a loop, and the end is connected to a loose rope. The loose rope passes through the movable ring and continues to extend through the outer sheath and the handle of the outer sheath, connecting to the second linear lever on the inner handle.

[0011] Furthermore, there is a flexible node at the loose rope section between the end of the flexible braided yarn and the movable loop; The flexible node is spindle-shaped.

[0012] Furthermore, the net bag is coated with a biocompatible adhesive, so that the net bag wall is attached to the traction wire along the axial direction.

[0013] Furthermore, a dense protrusion area is provided on the traction wire behind the movable ring.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention ensures that stones can be retrieved, grasped, and removed for normal stone removal procedures. During stone removal, it tightens the mesh, reduces its volume, lubricates the mesh, stone, and bile duct, and provides a lubricating effect, creating a dual-force of inward and outward pushing. This promptly remedies situations where the mesh and stone become impacted, mitigating the impaction force as much as possible and allowing for smooth stone removal. Furthermore, by modifying the traditional fixed mesh structure, it allows for direct disassembly and pull-out of the mesh when the impaction force cannot be overcome, preventing instruments from remaining in the bile duct, reducing surgical risks, and improving surgical reliability. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 A perspective view of the present invention is shown; Figure 2 A second perspective view of the present invention is shown; Figure 3 A third perspective view of the present invention is shown; Figure 4 The present invention is shown. Figure 1 Enlarged view of point A; Figure 5 The present invention is shown. Figure 2 Enlarged view of point B; Figure 6 The present invention is shown. Figure 3 Enlarged view of point C; Figure 7 The present invention is shown. Figure 3 Enlarged view of point D.

[0017] In the figure, the same reference numerals represent the same structural element, wherein: 1. Outer sheath; 2. Outer sheath handle; 3. Inner handle; 4. Traction wire; 5. Shape memory alloy wire; 6. Net bag; 7. Movable ring; 8. Adhesive plate; 9. Cable; 10. First linear lever; 11. Miniature nozzle; 12. Rubber airbag sleeve; 13. Inflation tube; 14. Loose cord; 15. Second linear lever; 16. Flexible node; 17. Dense protrusion area. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0019] like Figures 1-7 As shown, an anti-impact stone remover includes: an outer sheath tube 1, an outer sheath tube handle 2, an inner handle 3, a traction wire 4, a shape memory alloy wire 5, and a net 6. The outer sheath tube 1 is connected to the outer sheath tube handle 2, the inner handle 3 is slidably connected to the outer sheath tube handle 2, and the traction wire 4 is connected to the inner handle 3 and passes through the outer sheath tube handle 2 and the outer sheath tube 1. The shape memory alloy wire 5 is placed on the traction wire 4, and the shape memory alloy wire 5 is threaded onto the edge of the opening of the cone-shaped net bag 6; The shape memory alloy wire 5 is used to open the opening of the net 6. When the inner handle 3 is pushed or pulled, the traction wire 4 pulls the net 6 to move axially along the outer sheath 1, allowing it to enter and exit the outer sheath 1. The opening of the cone-shaped net 6 faces the proximal end, i.e., towards the operator, to facilitate the retrieval and containment of stones. The shape memory alloy wire 5 is preferably a nickel-titanium alloy wire to ensure that the opening of the net 6 can be opened to the preset shape, thus ensuring the formation of a stable stone capture entrance. During the operation, the surgeon pushes the inner handle 3, and the traction wire 4 is pushed forward, thereby pushing the traction wire 4 out of the outer sheath 1. After the net 6 and the shape memory alloy wire 5 are pushed out of the outer sheath 1, the shape memory alloy wire 5 springs open, opening the opening of the net 6 to the preset shape. After capturing the stone, the inner handle 3 is pulled back, pulling the traction wire 4 backward. The outer sheath 1 and the shape memory alloy wire 5 are then forcibly twisted together and inserted into the outer sheath 1 for retrieval until the stone is removed. This ensures that the stone can be grasped and removed to perform normal stone removal operations. During the stone removal process, the mesh 6 is tightened to reduce its volume, lubricate the mesh 6, the stone, and the bile duct, and provide a lubricating effect. This creates a dual force of pushing inward and pulling outward. If the mesh 6 and the stone become stuck, it can be remedied in time to counteract the stuck force as much as possible and remove the stone smoothly. In addition, the traditional fixed structure of the mesh 6 is changed so that if the stuck force cannot be overcome and the mesh 6 becomes stuck and cannot be removed, the mesh 6 can be directly disassembled and pulled out to prevent instruments from being stuck in the bile duct, reducing surgical risks and improving the reliability of the operation.

[0020] Optionally, a movable ring 7 is fitted onto the traction wire 4 at a position on the side of the net bag 6 facing the inward handle 3. The movable ring 7 is connected to a patch 8, which is attached to the traction wire 4. The movable ring 7 is connected to a pull cable 9, which passes through the outer sheath tube 1 and the outer sheath tube handle 2 and is connected to the first linear lever 10 on the inner handle 3. One end of the shape memory alloy wire 5 is connected to the traction wire 4, and the other end is connected to the mounting plate 8; When the first linear lever 10 is pulled back, the movable ring 7 can be pulled along the traction wire 4 via the pull cable 9. During the operation, the movable ring 7 extends into the lesion along the traction wire 4. When the stone is captured and removed, if there is impaction, the first linear lever 10 is pulled back immediately, and the movable ring 7 is pulled back via the pull cable 9, thereby pulling one end of the shape memory alloy wire 5 backward, realizing the contraction of the opening of the shape memory alloy wire 5, which in turn causes the mesh bag 6 to tighten, greatly reducing the overall volume of the mesh bag 6, realizing timely rescue, helping the mesh bag 6 and the stone to leave the bile duct, and removing the stone.

[0021] Optionally, the side of the panel 8 is provided with a miniature nozzle 11, which is angled towards the net bag 6. The cable 9 is internally perforated and extended to pass through the movable ring 7 and the plate 8 to connect to the micro nozzle 11. The portion of the cable 9 extending out of the outer sheath handle 2 connects to the external biocompatible lubricant supply source via a connecting pipe. In case of obstruction, the external biocompatible lubricant supply source is immediately activated to begin supplying the biocompatible lubricant. The biocompatible lubricant enters the micro nozzle 11 through the cable 9 and is sprayed by the micro nozzle 11 onto the mesh 6, the stone, and the surrounding bile duct to provide lubrication, effectively reducing the friction between the mesh 6 and the stone. Combined with the means of tightening the mesh 6, the obstruction force is eliminated as much as possible, thereby allowing the stone to be removed smoothly. The use of biocompatible lubricant ensures that it is non-irritating and does not cause allergic reactions in the human body.

[0022] Optionally, the traction wire 4 extends forward past the net bag 6, so that the end of the traction wire 4 protrudes from the net bag 6. The protruding section of the traction wire 4 can be used as a path-opening section, extending into the lesion before the net bag 6, playing the role of probing, guiding and separating, so that the net bag 6 can smoothly reach the predetermined position behind the stone. Guide wires are movably inserted into the outer sheath 1 and the outer sheath handle 2. The guide wires can pass through the outer sheath 1 to the front of the net 6, and at the same time, the guide wires are pushed forward to keep them in front of the net 6. In addition, a separate guide wire is used to guide the net 6 through, especially in narrow places, to further ensure that the net 6 can be smoothly pushed deeper until it reaches the predetermined position behind the stone.

[0023] Optionally, a rubber airbag sleeve 12 is wrapped around the traction wire 4 at the position in front of the net 6. The rubber airbag sleeve 12 is connected to an inflation tube 13. The inflation tube 13 extends along the traction wire 4, passes through the outer sheath tube 1 and the outer sheath tube handle 2, and connects to an external air source. Under normal circumstances, the thin rubber airbag sleeve 12 does not affect the insertion of the traction wire 4. When impingement occurs, the external air source is immediately activated to inflate the rubber airbag sleeve 12, causing it to expand radially and thus increase its diameter to ensure contact with the net 6 and the stone. The inflation tube 13 is then pulled back to pull the rubber airbag sleeve 12 along the traction wire 4. The inflated rubber airbag sleeve 12 actively pushes the net 6 outward from behind, forming a double force of inward pushing and outward pulling. This, combined with tightening the net 6 and lubrication, provides timely and effective relief to ensure that the impingement phenomenon can be overcome and the stone can be smoothly removed.

[0024] Optionally, the net bag 6 is woven from a single continuous flexible filament, and each node of the net bag 6 can slide. The flexible braided wire ends are designed as slip loops, and the ends are connected to a loose rope 14. The loose rope 14 passes through the movable ring 7 and continues to extend through the outer sheath tube 1 and the outer sheath tube handle 2, connecting to the second linear lever 15 on the inner handle 3. Each knot of the entire net bag 6 is a sliding "slip loop" without any dead knots. When all remedial measures fail and the stone cannot be removed, the second linear lever 15 is pulled, and the loose rope 14 pulls the ends of the entire net bag 6, thereby untying each coil knot in turn, dispersing the net bag 6 into single flexible braided wires, until the net bag 6 is completely disassembled and disappears from the bile duct. This changes the traditional fixed structure of the basket, ensuring that when the impaction force cannot be overcome and the stone retrieval basket becomes impacted and cannot be removed, the net bag 6 can be directly disassembled and pulled out, preventing instruments from remaining in the bile duct, reducing the impact of impaction, lowering surgical risks, and improving the reliability of the surgery.

[0025] Optionally, a flexible node 16 is provided at the location of the loose rope 14 between the end of the flexible braided yarn and the movable loop 7; The flexible node 16 is spindle-shaped. The spindle-shaped flexible node 16 is thicker than other parts of the loose rope 14. Therefore, a certain force needs to be applied to pull the loose rope 14 through the movable ring 7. That is, a certain pulling force is needed to open the net bag 6, so as to ensure the stability of the net bag 6 during normal use and prevent the net bag 6 from being torn apart by accidental operation.

[0026] Optionally, the net 6 is coated with biocompatible adhesive, allowing the net wall of the net 6 to adhere axially to the traction wire 4. Before surgery, the net 6 is soaked with biocompatible adhesive or medical glue with a certain degree of stickiness to reinforce each node of the net 6 without affecting its unfolding, ensuring the net 6's firmness and preventing severe deformation. This ensures stable capture and removal of stones. Simultaneously, the moist adhesive liquid on the net 6 allows it to hang naturally, enabling the lower net wall of the net 6 to adhere to the traction wire 4, ensuring axial connection rather than a single-point connection. This guarantees uniform and stable wire delivery and force transmission, thus ensuring the net 6 is accurately and stably delivered to the lesion.

[0027] Optionally, a dense protrusion area 17 is provided on the traction wire 4 behind the movable ring 7, so that the movable ring 7 has to overcome a certain friction force to move backward. This ensures that the movable ring 7 can only be pulled backward by the cable 9 by pulling the first linear lever 10. Even when the flexible node 16 forcibly passes through the movable ring 7, the movable ring 7 will not move. This ensures that the operation of disassembling the net bag 6 and tightening the net bag 6 will not interfere with each other, and that the net bag 6 can be disassembled smoothly.

[0028] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A stone-retrieving device for preventing embedding, characterized in that, include: The outer sheath (1), outer sheath handle (2), inner handle (3), traction wire (4), shape memory alloy wire (5) and net (6) are provided. The outer sheath (1) is connected to the outer sheath handle (2). The inner handle (3) is slidably connected to the outer sheath handle (2). The traction wire (4) is connected to the inner handle (3) and passes through the outer sheath handle (2) and the outer sheath (1). The shape memory alloy wire (5) is disposed on the traction wire (4), and the shape memory alloy wire (5) is threaded onto the opening edge of the cone-shaped net bag (6); The shape memory alloy wire (5) is used to open the opening of the net (6). When the inner handle (3) is pushed or pulled, the net (6) is pulled along the axial displacement of the outer sheath (1) by the traction wire (4) so ​​that it can enter and exit the outer sheath (1).

2. The anti-embedded stone extractor as described in claim 1, characterized in that, A movable ring sleeve (7) is fitted on the traction wire (4) at a position on the side of the net (6) facing the inner handle (3). The movable ring sleeve (7) is connected to a patch plate (8), which is attached to the traction wire (4). The movable ring sleeve (7) is connected to a cable (9), which passes through the outer sheath tube (1) and the outer sheath tube handle (2) and is connected to the first linear lever (10) on the inner handle (3). One end of the shape memory alloy wire (5) is connected to the traction wire (4), and the other end is connected to the plate (8). When the first linear lever (10) is pulled back, the movable ring (7) can be pulled along the traction wire (4) by the cable (9).

3. The anti-embedded stone extractor as described in claim 2, characterized in that, The side of the patch (8) is provided with a micro nozzle (11), which is diagonally opposite the net (6). The cable (9) is internally continuous and extended so that it passes through the movable ring (7) and the plate (8) to connect to the micro nozzle (11). The portion of the cable (9) extending out of the outer sheath handle (2) is connected to the external biocompatible lubricant supply source through the connecting pipe.

4. The anti-jamming stone extractor as described in claim 3, characterized in that, The traction wire (4) extends forward over the net bag (6) so that the end of the traction wire (4) protrudes out of the net bag (6). A guide wire is movably inserted inside the outer sheath (1) and the outer sheath handle (2), and the guide wire can pass through the outer sheath (1) to the front of the net (6).

5. The anti-jamming stone extractor as described in claim 4, characterized in that, A rubber airbag sleeve (12) is wrapped around the traction wire (4) at the position in front of the net bag (6). The rubber airbag sleeve (12) is connected to an inflation tube (13). The inflation tube (13) extends along the traction wire (4) and passes through the outer sheath tube (1) and the handle of the outer sheath tube (2) to connect to an external air source.

6. The anti-jamming stone extractor as described in claim 5, characterized in that, The net (6) is woven from a continuous flexible woven thread, and each node of the net (6) can slide. The end of the flexible braided yarn is made into a loop, and the end of the yarn is connected to a loose rope (14). The loose rope (14) passes through the movable ring (7) and continues to extend through the outer sheath (1) and the outer sheath handle (2) and connects to the second linear lever (15) on the inner handle (3).

7. The anti-jamming stone extractor as described in claim 6, characterized in that, There is a flexible node (16) on the loose rope (14) between the end of the flexible braided yarn and the movable loop (7). The flexible node (16) is spindle-shaped.

8. The anti-jamming stone extractor as described in claim 7, characterized in that, The net (6) is coated with a biocompatible adhesive, so that the net wall of the net (6) is attached to the traction wire (4) along the axial direction.

9. The anti-jamming stone extractor as described in claim 8, characterized in that, The traction wire (4) is provided with a dense protrusion area (17) located behind the movable ring (7).

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