Guidewire stone retrieval basket

Abstract

The utility model provides a kind of wire guide calculus extraction net basket, including net basket, guide wire, net basket cap, outer sheath and handle, tail end of guide wire is connected with the head end of net basket cap, net basket cap is placed in the head end outside of outer sheath, net basket is inserted to the inside of outer sheath through the tail end of outer sheath, one end of net basket is connected with the tail end of net basket cap, other end is connected with handle;Handle is located in the tail end outside of outer sheath.The utility model can be inserted through papilla incision knife, SpyGlass or insight pancreatic duct imaging system channel etc.Various instrument channels, realize the calculus extraction treatment of multiple scenes;During the release of net basket, soft guide wire head end crosses stone more easily into the distal bile duct, more conducive to the release of net basket, and net basket can be taken out of stone by pulling back.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, to a guide wire stone retrieval basket. Background Technology

[0002] Bile duct stones are a common and frequently occurring disease in my country, including gallbladder stones, intrahepatic bile duct stones, and common bile duct stones. Obstruction of the cystic duct or bile duct by stones can induce complications such as acute cholecystitis, acute cholangitis, obstructive jaundice, and acute biliary pancreatitis, and may even lead to septic shock, endangering the patient's life. Long-term irritation from stones increases the risk of gallbladder cancer and bile duct cancer.

[0003] Endoscopic retrograde cholangiopancreatography (ERCP) is a common method for treating common bile duct and cystic duct stones using duodenoscopy. It is also used to treat intrahepatic bile duct stones, but this method is more challenging. Because the intrahepatic bile ducts have a tree-like structure with increasing branching towards the distal end, it is difficult to accurately insert the stone retrieval basket into the bile duct containing the stone under X-ray fluoroscopy. With the development of endoscopic technology, the SpyGlass or Insight pancreaticobiliary imaging system has been applied clinically. This system can enter the common bile duct and intrahepatic bile ducts, allowing direct visualization to locate stones and achieve precise stone removal. The most common method for stone removal in ERCP is to insert the stone retrieval basket catheter through the duodenal papilla into the common bile duct or cystic duct under X-ray fluoroscopy. The tip of the basket catheter passes through the gap between the stone and the wall of the common bile duct or cystic duct into the bile duct above the stone. The basket is then opened and released, the basket catheter is pulled back, and the stone is retrieved, directly pulled from the common bile duct or cystic duct into the duodenal lumen. The SpyGlass or Insight pancreaticobiliary imaging system uses the same stone removal method as ERCP, the only difference being that it allows for direct visualization to locate, retrieve, and remove the stones.

[0004] The retrieval baskets used in ERCP (Endoscopic Retrograde Cholangiopancreatography) are structurally similar to those used in pancreatobiliary imaging systems, but differ in model. ERCP retrieval baskets typically have a diameter of 2-3 mm and use a plastic outer sheath; pancreatobiliary imaging system baskets generally have a diameter less than 1 mm and use a metal outer tube. Because the diameter of the ERCP retrieval basket sheath exceeds 2 mm, the following situations often occur during clinical stone retrieval: 1. When the diameter of the common bile duct stone is slightly smaller than the common bile duct diameter, or when the common bile duct stone is impacted, the retrieval basket sheath has difficulty passing through the gap between the stone and the common bile duct wall, leading to stone retrieval failure or pushing the stone into the distal intrahepatic bile duct, increasing the difficulty of stone retrieval; 2. The normal diameter of the cystic duct is 2-3 mm, and the gap between the cystic duct stone and the inner wall of the cystic duct is even narrower, making it difficult for a 2-3 mm diameter retrieval basket to pass through, leading to stone retrieval failure. The pancreatobiliary imaging system uses a basket with a diameter of less than 1 mm, which theoretically makes it easier to pass through the gap between the stone and the bile duct or bile duct wall, increasing the success rate of removing common bile duct stones, cystic duct stones, and intrahepatic bile duct stones. In practice, the pancreatobiliary imaging system can indeed accurately locate, retrieve, and remove stones. However, the outer tube of the stone retrieval basket with a diameter of less than 1 mm is a metal tube, whose strength is much greater than the plastic sheath of the 2-3 mm diameter stone retrieval basket. This results in poor flexibility of the metal sheath basket, making it impossible to directly insert it into the common bile duct through the duodenoscopic forceps channel and unsuitable for treating common bile duct stones under conventional X-ray fluoroscopy. Stone retrieval baskets with a diameter of less than 1 mm can only be inserted through the forceps channel of the pancreatobiliary imaging system, and the basket sheath is inserted through the gap between the stone and the bile duct wall under direct vision, then the basket is released to retrieve the stone. However, pancreatobiliary imaging systems cannot visualize the basket sheath after it passes through the gap between the stone and the bile duct wall. If the bile duct behind the stone is tortuous, the inserted basket cap may press against the bile duct wall, preventing the basket from being released and causing stone retrieval failure. Forcibly inserting the basket sheath or opening the basket can cause it to penetrate the bile duct wall and enter the liver parenchyma, leading to complications such as bleeding and bile leakage. Although basket sheaths with a diameter less than 1 mm can easily pass through the gap between the cystic duct stone and the cystic duct wall, the cystic duct is tortuous and has multiple Heister valves, making it difficult for the basket sheath and cap to enter the cystic duct distal to the stone, preventing the basket from opening and rendering it unsuitable for treating cystic duct stones. Utility Model Content

[0005] To address the aforementioned technical issues, a guide wire stone retrieval basket is provided.

[0006] The technical means adopted in this utility model are as follows:

[0007] A guide wire stone retrieval basket includes a basket and a guide wire, a basket cap, an outer sheath, and a handle arranged sequentially from head to tail. The tail end of the guide wire is connected to the head end of the basket cap. The basket cap is placed outside the head end of the outer sheath. The basket is inserted into the outer sheath through the tail end of the outer sheath. One end of the basket is connected to the tail end of the basket cap, and the other end is connected to the handle. The handle is located outside the tail end of the outer sheath.

[0008] Furthermore, the guidewire is a flexible guidewire, consisting of a first metal wire and a flexible wrapping material, with the first metal wire disposed inside and the flexible wrapping material wrapped around the outside of the first metal wire.

[0009] Furthermore, the net basket includes multiple second metal wires and connecting rods arranged in parallel. The connecting rods are inserted into the interior of the outer sheath tube through the tail end of the outer sheath tube. The head ends of the multiple second metal wires are connected to the net basket cap, and the tail ends are connected to the head end of the connecting rod. The tail end of the connecting rod is connected to the handle.

[0010] Furthermore, the second metal wire has four strands.

[0011] Furthermore, the tail end of the basket cap is provided with a groove, and the head ends of the multiple second metal wires are connected to the groove.

[0012] Furthermore, the outer sheath is a single-channel tube made of metal, with a single channel inside, and the basket is placed in the single channel.

[0013] Furthermore, the basket cap is made of metal.

[0014] This utility model also provides an application of a guidewire stone retrieval basket, which is used to assist in the insertion of bile duct cannula and sphincter incision with a sphincter of Oddi, removal of common bile duct stones under X-ray fluoroscopy, removal of cystic duct stones under X-ray fluoroscopy, removal of intrahepatic bile duct stones under X-ray fluoroscopy, stone retrieval under direct vision with a pancreaticobiliary imaging system, percutaneous transhepatic bile duct stone retrieval, bronchial foreign body retrieval under ultra-thin bronchoscope, removal of ureteral or renal pelvis stones under ultra-thin ureteroscope, removal of gallbladder stones under ultra-thin choledochoscope, removal of thrombi via venous or arterial puncture catheter under X-ray fluoroscopy, and removal of bronchial foreign bodies under X-ray fluoroscopy.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The guide wire stone retrieval basket provided by this utility model has a section of soft guide wire added to the basket cap. This stone retrieval basket can enter the intrahepatic bile duct, cystic duct, and even pancreatic duct for stone retrieval, thus increasing its indications.

[0017] 2. The guide wire stone retrieval basket provided by this utility model adds a section of soft guide wire to the basket cap. This stone retrieval basket can not only be used for stone retrieval under direct vision of pancreaticobiliary imaging system, but also be inserted into the common bile duct through the channel of instruments such as sphincterotomy knife, or be placed into the common bile duct percutaneously through hepatobiliary fistula for stone retrieval under X-ray fluoroscopy, thus increasing its operation methods.

[0018] 3. The guide wire stone retrieval basket provided by this utility model adds a section of soft guide wire to the basket cap. After the basket passes through the gap between the stone and the tube wall, it is easier to enter the distal bile duct, reducing the collateral damage during basket placement.

[0019] 4. The guide wire stone retrieval basket provided by this utility model adds a soft guide wire to the basket cap. After the basket passes through the gap between the stone and the tube wall, during the release of the basket, the basket cap and guide wire at the head of the basket can more easily enter the bile duct that is twisted or angled. The fully released basket is more likely to retrieve the stone, increasing the success rate of stone retrieval.

[0020] 5. The guide wire stone retrieval basket provided by this utility model adds a section of soft guide wire to the basket cap, which has some of the functions of a guide wire, such as inserting a cannula with a nipple sphincter cutter and stone retrieval basket, and cutting the nipple sphincter after successful cannulation.

[0021] Based on the above reasons, this utility model can be widely promoted in fields such as medicine. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0025] Figure 3 This is a schematic diagram of the basket after it has been released.

[0026] In the diagram: 1. Guide wire; 2. Net basket cap; 3. Outer sheath; 4. Handle; 51. Second metal wire; 52. Connecting rod. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] Example 1

[0029] This utility model provides a guide wire stone retrieval basket, including a guide wire 1, a basket cap 2, an outer sheath 3, a basket, and a handle 4. The guide wire 1, basket cap 2, outer sheath 3, and handle 4 are arranged sequentially from head to tail. The tail end of the guide wire 1 is connected to the head end of the basket cap 2. The basket cap 2 is placed outside the head end of the outer sheath 3 and is positioned between the guide wire 1 and the outer sheath 3. The basket is inserted into the interior of the outer sheath 3 through the tail end of the outer sheath 3. One end of the basket is connected to the tail end of the basket cap 2, and the other end is connected to the handle 4. The handle 4 is located outside the tail end of the outer sheath 3.

[0030] The guide wire 1 is a flexible guide wire, composed of a first metal wire and a flexible wrapping material, and connected to a metal basket cap 2. The first metal wire is located inside, and the flexible wrapping material is wrapped around the outside of the first metal wire. The outer sheath 3 is a single-channel tube made of metal, with a single channel inside through which the basket passes. The basket consists of four parallel second metal wires 51 and a connecting rod 52. The connecting rod 52 is inserted into the outer sheath 3 through its tail end. The heads of the four second metal wires 51 are connected to the basket cap 2, and the tails are connected to the heads of the connecting rods 52. The tail of the connecting rods 52 is connected to the handle 4. The basket cap 2 has a groove inside, and the heads of the four second metal wires 51 are connected to the groove.

[0031] This utility model closely resembles a zebra guidewire in appearance and can be inserted through various instrument channels such as the papillary incision knife, SpyGlass, or the forceps channel of the Insight Pancreaticobiliary Imaging System, enabling stone removal treatment in multiple scenarios. During the release of the basket, the tip of the flexible guidewire can more easily enter the distal bile duct after passing over the stone, which is more conducive to the release of the basket. Pulling back the basket can then retrieve the stone.

[0032] Example 2

[0033] Application of this novel guide wire stone retrieval basket:

[0034] 1. Assisted Petechial Sphincter Incision and Bile Duct Cannulation: A papillary sphincter is inserted through the duodenoscope's clamp channel. A guidewire stone retrieval basket is then inserted through the papillary sphincter's clamp channel. The placement point, axis, and curvature of the papillary sphincter relative to the duodenal papilla are adjusted. The guidewire stone retrieval basket is then inserted, allowing it to enter the common bile duct through the papillary sphincter. The papillary sphincter is connected to a high-frequency generator. The direction and curvature of the papillary sphincter's wire are adjusted to gradually incise the papillary sphincter.

[0035] 2. Removal of common bile duct stones under X-ray fluoroscopy: After successful cannulation of the common bile duct with a guidewire via a sphincter incision knife, a guidewire stone retrieval basket is inserted through the forceps channel of the sphincter incision knife. The basket passes through the gap between the common bile duct stone and the common bile duct wall and enters the bile duct above the stone. The basket is opened, pulled back, and the stone is retrieved. The stone is then dragged through the common bile duct into the duodenum.

[0036] 3. Removal of gallstones from the cystic duct under X-ray fluoroscopy: After successful cannulation of the common bile duct and cystic duct with a guidewire using a sphincter sphincter, a guidewire stone retrieval basket is inserted through the forceps channel of the sphincter sphincter. The basket passes through the gap between the stone and the wall of the cystic duct and enters the distal cystic duct or gallbladder of the stone. The basket is opened, pulled back, and the stone is retrieved. The stone is then dragged into the duodenum through the cystic duct.

[0037] 4. Removal of intrahepatic bile duct stones under X-ray fluoroscopy: After successful access to the common bile duct via a sphincter incision knife with a guidewire, the guidewire is superselectively inserted into the bile duct where the intrahepatic stone is located. A stone retrieval basket is placed through the forceps channel of the sphincter incision knife. The basket passes through the gap between the stone and the bile duct wall and enters the bile duct distal to the stone. The basket is opened, pulled back, and the stone is retrieved. The stone is then dragged into the duodenal lumen through the intrahepatic bile duct.

[0038] 5. Direct visualization of the pancreatobiliary imaging system for stone removal: The pancreatobiliary imaging system is inserted into the common bile duct / intrahepatic bile duct / cystic duct to locate the common bile duct stone / intrahepatic bile duct stone / cystic duct stone. The pancreatobiliary imaging system is fixed and a guide wire stone retrieval basket is inserted through its forceps channel. The basket passes through the gap between the stone and the duct wall and enters the distal lumen of the stone. The basket is opened, pulled back, and the stone is retrieved. The stone, along with the pancreatobiliary imaging system, is pulled into the duodenal lumen.

[0039] 6. Percutaneous transhepatic bile duct stone removal: After inserting a guidewire stone retrieval basket into the percutaneous transhepatic bile duct drainage tube or after removing the percutaneous transhepatic bile duct drainage tube, the guidewire stone retrieval basket is directly inserted through the fistula. Under the guidance of the soft guidewire, the guidewire basket enters the common bile duct through the fistula and passes over the stone. The basket is then released and the stone is retrieved from the fistula.

[0040] 7. Other applications: Removal of bronchial foreign bodies under ultra-thin bronchoscopy, removal of ureteral or renal pelvis stones under ultra-thin ureteroscopy, removal of gallbladder stones under ultra-thin choledochoscopy; removal of thrombi via venous or arterial puncture catheters under X-ray fluoroscopy, removal of bronchial foreign bodies, etc.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A guide wire stone retrieval basket, characterized in that, The net basket includes a guide wire (1), a net basket cap (2), an outer sheath tube (3), and a handle (4) arranged sequentially from head to tail. The tail end of the guide wire (1) is connected to the head end of the net basket cap (2). The net basket cap (2) is placed outside the head end of the outer sheath tube (3). The net basket is inserted into the interior of the outer sheath tube (3) through the tail end of the outer sheath tube (3). One end of the net basket is connected to the tail end of the net basket cap (2), and the other end is connected to the handle (4). The handle (4) is located outside the tail end of the outer sheath tube (3).

2. The guide wire stone retrieval basket according to claim 1, characterized in that, The guidewire (1) is a flexible guidewire, consisting of a first metal wire and a flexible wrapping material. The first metal wire is located inside, and the flexible wrapping material is wrapped around the outside of the first metal wire.

3. The guide wire stone retrieval basket according to claim 1, characterized in that, The net basket includes multiple second metal wires (51) and connecting rods (52) arranged in parallel. The connecting rods (52) are inserted into the interior of the outer sheath tube (3) through the tail end of the outer sheath tube (3). The head ends of the multiple second metal wires (51) are connected to the net basket cap (2), and the tail ends are connected to the head ends of the connecting rods (52). The tail ends of the connecting rods (52) are connected to the handle (4).

4. The guide wire stone retrieval basket according to claim 3, characterized in that, The second metal wire (51) has four strands.

5. The guide wire stone retrieval basket according to claim 3, characterized in that, The basket cap (2) has a groove inside its tail end, and the head ends of the multiple second metal wires (51) are connected to the groove.

6. The guide wire stone retrieval basket according to claim 1, characterized in that, The outer sheath (3) is a single-channel tube made of metal, with a single channel inside, and the basket is placed in the single channel.

7. The guide wire stone retrieval basket according to claim 1, characterized in that, The basket cap (2) is made of metal.

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