Calculus removing device for biliary calculus

Abstract

The utility model discloses a calculus removing device for biliary tract calculus, which comprises a sheath connected with a choledochoscope, a calculus removing mesh basket, a guide end connected to the front end part of the calculus removing mesh basket and a sheathing canal arranged at the rear end of the calculus removing mesh basket, and the guide end guides the calculus removing mesh basket and the sheathing canal to penetrate through the sheath; the calculus removing mesh basket comprises at least a plurality of first mesh basket wires, a second mesh basket wire is arranged between every two adjacent first mesh basket wires, and a first memory alloy wire, a second memory alloy wire and a third memory alloy wire are sequentially arranged on the surface of each second mesh basket wire from top to bottom; the second mesh basket wires are additionally arranged between the first mesh basket wires, and the first memory alloy wires, the second memory alloy wires and the third memory alloy wires which are arranged in a matched mode form a cobweb-shaped calculus removing structure, so that the supporting and blocking effects of the mesh basket wires at the front end are improved; in the stone removing process, fine broken stones can be quickly fished and taken out through the spider net-shaped structure at the front end part.

Description

Technical Field

[0001] The utility model relates to the technical field of bile duct stone removal, in particular to a stone removal device for bile duct stones. Background Art

[0002] Electrohydraulic lithotripsy is one of the important methods for the treatment of biliary stones. It is used to treat refractory biliary stones and is a safe, effective and widely used technology. Electrohydraulic lithotripsy is based on the principle of high-voltage shock waves generated by high-voltage electricity. A coaxial bipolar electrode is placed in water and energized to induce high voltage between the bipolar electrodes. There is an insulating layer between the two electrodes with different voltages. When the voltage difference between the two electrodes exceeds the maximum resistance of the insulating layer, sparks are generated between the electrodes to form plasma. Plasma is an uncharged ionized substance composed of ions, electrons and core particles. A plasma includes a large number of ions and electrons and is the best conductor of electricity. A shock wave of a certain electric force vibrates in the water, releasing the gas dissolved in the water to form small bubbles. The gas in the bubble expands and collapses in a very short time during the shock wave movement to form liquid shock wave lithotripsy. After the completion of electrohydraulic lithotripsy, it is necessary to cooperate with the stone retrieval basket to salvage the broken small stones. When the stone retrieval basket expands, the distance between the adjacent basket wires increases, and the larger stones are convenient to be taken out. However, the broken small stones are easy to escape from the gaps between the basket wires during the stone retrieval process, which can easily lead to incomplete stone removal and the need for repeated operations, which not only increases the patient's pain, but also greatly affects the operator's work efficiency. Therefore, a stone removal device for biliary stones is proposed here to solve the above problems. Summary of the invention

[0003] The utility model aims to provide a stone removal device for biliary stones in view of the problems existing in the prior art.

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

[0005] The utility model discloses a stone removal device for biliary stones, comprising a sheath connected to a choledochoscope, a stone removal basket, a guide end connected to the front end of the stone removal basket, and a sheath arranged at the rear end of the stone removal basket, wherein the guide end guides the stone removal basket and the sheath to pass through the sheath; the stone removal basket comprises at least a plurality of first basket wires, a second basket wire is arranged between two adjacent first basket wires, a first memory alloy wire, a second memory alloy wire and a third memory alloy wire are arranged on the surface of the second basket wire in sequence from top to bottom, and the ends on both sides of the first memory alloy wire, the second memory alloy wire and the third memory alloy wire are respectively connected to the first basket wires adjacent thereto.

[0006] As a preferred technical solution of the utility model, the lengths of the first memory alloy wire, the second memory alloy wire and the third memory alloy wire increase successively; an inflection point is formed at the connection between the two first memory alloy wires or the second memory alloy wires or the third memory alloy wires connected between two adjacent first net basket bars. When the stone taking net basket contracts, the first memory alloy wire, the second memory alloy wire and the third memory alloy wire are all folded and gathered from the inflection point, which will not affect the contraction of the stone taking net basket. When the stone taking net basket expands and opens, the first memory alloy wire, the second memory alloy wire and the third memory alloy wire are all stretched and opened from the inflection point to form a spider web-like web support, which is convenient for removing small gravel and effectively prevents the gravel from falling out due to the excessive gap between the two adjacent first net basket wires.

[0007] As a preferred technical solution of the utility model, the length of the second basket wire is one quarter of the first basket wire, which can leave enough gap for larger gravel to enter the stone retrieval basket. During the expansion of the stone retrieval basket, the maximum diameter of the stone retrieval basket is half of the first basket wire. During the expansion of the stone retrieval basket, the first basket wire always contacts the inner cavity of the bile duct, and the outer end of the second basket wire does not contact the inner cavity of the bile duct, thereby preventing the end of the second basket wire from scratching and damaging the inner wall of the bile duct.

[0008] As a preferred technical solution of the utility model, a twist handle is installed at one end of the sheath tube away from the stone removal basket.

[0009] As a preferred technical solution of the utility model, the sheath is glued to the outer wall of the hose portion of the choledochoscope, and the sheath is movably inserted into the interior of the sheath.

[0010] As a preferred technical solution of the utility model, the choledochoscope also includes an eyepiece part, an operating part, a distal end part and a catheter connection part, the eyepiece part is connected to one end of the operating part, the hose part is arranged between the other end of the operating part and the distal end part, and the periphery of the operating part is connected to the catheter connection part.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] The present application adds a second basket wire to the first basket wire, which cooperates with the first memory alloy wire, the second memory alloy wire and the third memory alloy wire to form a spider web-like stone removal structure, thereby increasing the support and blocking effect of the basket wire at the front end. During the stone removal process, fine gravel can be quickly salvaged through the spider web-like structure at the front end, thereby speeding up the stone removal efficiency of the operator and effectively shortening and reducing the patient's pain. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall front view structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the front view structure of the stone taking part of the utility model;

[0015] Figure 3 It is a schematic diagram of the three-dimensional structure of the stone removing part of the utility model.

[0016] In the figure: 1. eyepiece part; 101. operating part; 102. hose part; 103. tip end; 104. catheter connection part; 2. sheath; 3. twist handle; 301. sheath; 4. stone removal basket; 401. first basket wire; 402. second basket wire; 403. first memory alloy wire; 404. second memory alloy wire; 405. third memory alloy wire; 5. guide end. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] like Figure 1-3As shown, the utility model provides a stone removal device for bile duct stones, comprising a sheath 2 connected to a choledochoscope, a stone removal basket 4, a guide end 5 connected to the front end of the stone removal basket 4, and a sheath 301 arranged at the rear end of the stone removal basket 4, the guide end 5 guides the stone removal basket 4 and the sheath 301 to pass through the sheath 2, the guide end 5 and the sheath 301 are connected to the front and rear ends of the stone removal basket 4 by welding, the stone removal basket 4 comprises at least a plurality of first basket wires 401, a second basket wire 402 is arranged between two adjacent first basket wires 401, a first memory alloy wire 403, a second memory alloy wire 404 and a third memory alloy wire 405 are arranged on the surface of the second basket wire 402 from top to bottom in sequence, and the ends on both sides of the first memory alloy wire 403, the second memory alloy wire 404 and the third memory alloy wire 405 are respectively connected to the first basket wire 401 adjacent to them. The memory alloy wire is also known as the shape memory alloy. As the name implies, it is an alloy material with a "memory" effect and can remember its initial shape. The shape memory alloy is widely used in the clinical medical field, such as artificial bones, bone fixation pressurizers, dental orthodontic devices, various intracavitary stents, embolic devices, cardiac repair devices, thrombus filters, interventional guide wires and surgical sutures, etc. Through this characteristic, the first memory alloy wire 403, the second memory alloy wire 404 and the third memory alloy wire 405 can be folded and gathered from the inflection point during the contraction of the first basket wire 401; at the same time, the second basket wire 402 is added to the first basket wire 401, and the first memory alloy wire 403, the second memory alloy wire 404 and the third memory alloy wire 405 are formed in cooperation with the set first memory alloy wire 403, the second memory alloy wire 404 and the third memory alloy wire 405 to form a spider web-like stone removal structure, which increases the support and blocking effect of the basket wire at the front end, and in the process of stone removal, small gravel can be quickly salvaged and removed through the spider web-like structure at the front end.

[0019] Furthermore, the lengths of the first memory alloy wire 403, the second memory alloy wire 404 and the third memory alloy wire 405 increase successively; an inflection point is formed at the connection of the two first memory alloy wires 403 or the second memory alloy wire 404 or the third memory alloy wire 405 connected between two adjacent first basket bars. The memory alloy wire is also called shape memory alloy. As the name suggests, it is an alloy material with a "memory" effect and can remember its initial shape. Therefore, when the stone-removing basket 4 contracts, the first memory alloy wire 403, the second memory alloy wire 404 and the third memory alloy wire 405 are all folded and gathered from the inflection point, which will not affect the contraction of the stone-removing basket 4. When the stone-removing basket 4 expands and opens, the first memory alloy wire 403, the second memory alloy wire 404 and the third memory alloy wire 405 are all stretched and opened from the inflection point to form a spider web-like web support, which is convenient for removing small gravel and effectively prevents the gravel from falling out due to the excessive gap between the two adjacent first basket wires 401.

[0020] Furthermore, the length of the second basket wire 402 is one quarter of the first basket wire 401, which can leave enough space for larger gravel to enter the interior of the stone retrieval basket 4. During the expansion of the stone retrieval basket 4, the maximum diameter of the stone retrieval basket 4 is half of the first basket wire 401. During the expansion of the stone retrieval basket 4, the first basket wire 401 always contacts the inner cavity of the bile duct, and the outer end of the second basket wire 402 does not contact the inner cavity of the bile duct, thereby preventing the end of the second basket wire 402 from scratching and damaging the inner wall of the bile duct.

[0021] Furthermore, the length of the second basket wire 402 is one quarter of the first basket wire 401 , and the maximum diameter of the stone removal basket 4 during expansion is at one half of the first basket wire 401 .

[0022] Furthermore, a twist handle 3 is installed at one end of the sheath tube 301 away from the stone removal basket 4 .

[0023] Furthermore, the sheath 2 is glued to the outer wall of the hose portion 102 of the choledochoscope, and the sheath tube 301 is movably inserted into the sheath 2 .

[0024] Furthermore, the choledochoscope also includes an eyepiece portion 1, an operating portion 101, a distal end portion 103 and a catheter connection portion 104, the eyepiece portion 1 is connected to one end of the operating portion 101, the hose portion 102 is arranged between the other end of the operating portion 101 and the distal end portion 103, and the outer periphery of the operating portion 101 is connected to the catheter connection portion 104.

[0025] The operation steps of this specific implementation method are:

[0026] When cleaning the fine stones in the bile duct, the hose portion 102 and the distal end portion 103 of the choledochoscope enter the inner wall of the bile duct through the endoscopic treatment hole. After the stones are found, the stone removal basket 4 is released from the restrained position and expanded by itself by twisting the handle 3, and the stone removal basket is collected from the larger gap between the two adjacent first basket wires 401. After collection, the sheath 301 is operated to pull the stone removal basket 4 to move outside the patient's body. The fine stones are moved to the spider web-like structure at the front end of the stone removal basket 4 by external force and fit therewith, and then are taken out of the patient's body, completing the stone removal operation of the fine stones.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stone removal device for biliary stones, characterized in that: It comprises a sheath (2) connected to a choledochoscope, a stone removal basket (4), a guide end (5) connected to the front end of the stone removal basket (4), and a sheath tube (301) arranged at the rear end of the stone removal basket (4), wherein the guide end (5) guides the stone removal basket (4) and the sheath tube (301) to pass through the sheath (2); The stone-removing basket (4) comprises at least a plurality of first basket wires (401), a second basket wire (402) being arranged between two adjacent first basket wires (401), a first memory alloy wire (403), a second memory alloy wire (404) and a third memory alloy wire (405) being arranged on the surface of the second basket wire (402) in sequence from top to bottom, and both side ends of the first memory alloy wire (403), the second memory alloy wire (404) and the third memory alloy wire (405) are respectively connected to the adjacent first basket wires (401).

2. A stone removal device for biliary stones according to claim 1, characterized in that: The lengths of the first memory alloy wire (403), the second memory alloy wire (404), and the third memory alloy wire (405) increase in sequence.

3. A stone removal device for biliary stones according to claim 1, characterized in that: An inflection point is formed at the connection point of two first memory alloy wires (403) or second memory alloy wires (404) or third memory alloy wires (405) connected between two adjacent first net basket bars.

4. A stone removal device for biliary stones according to claim 1, characterized in that: The length of the second basket wire (402) is one quarter of the length of the first basket wire (401), and the maximum diameter of the stone removal basket (4) during expansion is always one half of the length of the first basket wire (401).

5. A stone removal device for biliary stones according to claim 1, characterized in that: A twist handle (3) is installed at one end of the sheath tube (301) away from the stone removal basket (4).

6. A stone removal device for biliary stones according to claim 1, characterized in that: The sheath (2) is glued and connected to the outer wall of the hose portion (102) of the choledochoscope, and the sheath tube (301) is movably plugged into the interior of the sheath (2).

7. A stone removal device for biliary stones according to claim 6, characterized in that: The choledochoscope further comprises an eyepiece portion (1), an operating portion (101), a distal end portion (103) and a catheter connection portion (104); the eyepiece portion (1) is connected to one end of the operating portion (101); the hose portion (102) is arranged between the other end of the operating portion (101) and the distal end portion (103); and the outer periphery of the operating portion (101) is connected to the catheter connection portion (104).

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