Calculus removing mesh basket and manufacturing method thereof

Abstract

The invention relates to the technical field of medical instruments, in particular to a calculus removing mesh basket and a manufacturing method thereof. The calculus removing mesh basket comprises a mesh basket head and a core wire, the mesh basket head is shaped by at least two strands of elastic wires to form a preset mesh basket shape, and the two ends of each elastic wire are fixed; and each elastic wire consists of a first metal wire and a coating layer which sleeves or coats the periphery of the first metal wire. The manufacturing method of the calculus removing mesh basket is used for manufacturing the calculus removing mesh basket. According to the calculus removing mesh basket and the manufacturing method thereof, the developing effect of the mesh basket under X rays is improved while the moderate hardness of the wires is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a stone removal basket and a manufacturing method thereof. Background Art

[0002] Endoscopic retrograde cholangiopancreatography (ERCP) involves inserting an endoscope through the mouth into the descending duodenum, passing specialized instruments through the duodenal papilla into the bile or pancreatic duct, and then injecting a contrast agent under X-ray fluoroscopy to visualize the pancreaticobiliary duct. During ERCP biliary stone removal, a stone basket is essential.

[0003] The mesh basket needs to have good development effect under X-rays. Currently, most of the methods on the market improve the development effect of the mesh basket by increasing the wire diameter of the mesh basket or adding a development structure to the head of the mesh basket.

[0004] However, simply increasing the basket wire diameter will increase its stiffness. Excessively stiff wire not only impairs the basket's ability to push but can also easily damage tissues such as the pancreaticobiliary tract mucosa during advancement. While adding a radiopaque structure to the basket head allows for visualization of the basket head under X-rays, which can help infer the basket's position, the overall position and shape of the basket cannot be clearly visualized, hindering surgical efficiency. Summary of the Invention

[0005] The purpose of this application is to provide a stone removal net basket and a manufacturing method thereof, so as to improve the development effect of the net basket under X-ray while ensuring the moderate hardness of the wire material.

[0006] In a first aspect, the present application provides a stone removal basket, comprising a basket head and a core wire.

[0007] The basket head is formed into a predetermined basket shape by at least two elastic threads, and both ends of each elastic thread are fixed;

[0008] Each of the elastic lines consists of a first metal wire and a coating layer sleeved or coated on the outer periphery of the first metal wire.

[0009] Furthermore, the coating layer is composed of multiple strands of second metal wires;

[0010] A plurality of strands of the second metal wire are wrapped around the outside of the first metal wire, or

[0011] A plurality of second metal wires are wrapped around the outside of the first metal wire and twisted with the first metal wire to form the elastic wire.

[0012] Furthermore, the first metal wire and the second metal wire are made of nickel-titanium wire or stainless steel wire.

[0013] Furthermore, the first metal wires and the second metal wires of each strand of the elastic thread have the same wire diameter.

[0014] Furthermore, the covering layer is configured as a hose, the hose is a hollow structure, the hose is sleeved or covered on the outer periphery of the first metal wire along the extension direction of the first metal wire, and the first metal wire is arranged to pass through the hose.

[0015] Furthermore, the hose is configured as a spring tube, and the spring tube is formed by winding or braiding.

[0016] Furthermore, the spring tube is formed by winding or braiding a single layer of spring wire; or

[0017] The spring tube is formed by stacking and winding or braiding at least two layers of spring wires.

[0018] Furthermore, the number of layers of the spring tube is between 1 and 4, and the thickness of each layer of the spring wire is between 0.01 and 0.1 mm;

[0019] The diameter of the first metal wire is between 0.1 and 0.4 mm.

[0020] Furthermore, the first metal wire is nickel-titanium wire or stainless steel wire; and / or

[0021] The spring tube is made of stainless steel wire having a density greater than that of nickel-titanium alloy. Furthermore, the end surface of the hose is flush with the end surface of the first metal wire, or the end surface of the hose is lower than the end surface of the first metal wire.

[0022] Furthermore, the stone removal basket also includes a basket tail connected to the basket head, and the basket tail is formed by mutually winding and bundling the extended parts of the proximal ends of the elastic lines of the basket head into a strand.

[0023] Furthermore, the basket head also includes an end fixedly provided at the distal end of each elastic line and a limiting tube fixedly provided at the proximal end of each elastic line, the end being provided with a mounting hole for fixing each elastic line, the limiting tube being a hollow structure, and the proximal end of each elastic line being inserted into the hollow position of the limiting tube for limiting and fixing.

[0024] Furthermore, the end head is provided with a guidewire cavity for passing a guidewire.

[0025] Furthermore, the distance between the limiting tube and the end is between 10 and 100 mm.

[0026] In a second aspect, the present application provides a method for manufacturing a stone-removing net basket, which is used to manufacture the stone-removing net basket. The manufacturing method comprises:

[0027] Step 110: Pre-install the end cap. First, each strand of the first metal wire is passed through the end cap. The ends of the first metal wires are fixedly connected to the end cap by crimping or welding. A gap is ensured between the inner periphery of the end cap and each strand of the first metal wire to facilitate installation of the hose.

[0028] Step 120: The basket head is shaped. After the basket head is installed in a shaping fixture, it is placed in a temperature environment of 400-600°C for 10-35 minutes, then taken out and placed in room temperature water for cooling.

[0029] Step 130: Threading the hose and securing the distal end. A hose is threaded onto the proximal end of each first metal wire of the shaped basket head until it reaches the mounting hole of the endpiece. The first metal wire is then completely secured to the hose head by welding or riveting at the rear end of the endpiece.

[0030] Step 140 , the proximal end of the basket head is fixed, the basket head is removed, and a limiting tube is put on the proximal end of the basket head. The basket head is completed by crimping or welding according to the required length of the basket head.

[0031] In a third aspect, the present application provides a method for manufacturing a stone-removing basket, which is used to manufacture the stone-removing basket. The method comprises:

[0032] Step 210: Pre-assembly of the hose wires by wrapping the hose around the outer periphery of each first metal wire to form each elastic wire, and ensuring that the end surface of the first metal wire is flush with the end surface of the hose to cover them;

[0033] Step 220: The basket head is fixed at the far end, and the pre-assembled elastic wires are installed into the mounting holes of the end. The first metal wire and the hose at the end of the elastic wire are fixed by crimping, and then the end of the end is welded.

[0034] Step 230: The basket head is shaped. After the basket head is installed in a shaping fixture, it is placed in a temperature environment of 400-600°C for 10-35 minutes, then taken out and placed in room temperature water for cooling.

[0035] Step 240 , the proximal end of the basket head is fixed, the basket head is removed, and a limiting tube is put on the proximal end of the basket head. The basket head is completed by crimping and welding according to the required length of the basket head.

[0036] In the first aspect, the present application provides a method for manufacturing a stone removal net basket, which is used to manufacture the stone removal net basket, and the manufacturing method includes:

[0037] Step 310, making an elastic thread, wherein each elastic thread is made of a first metal wire and multiple second metal wires are wrapped around the first metal wire, or multiple second metal wires are wrapped around the first metal wire and twisted with the first metal wire to form an elastic thread;

[0038] Step 320: Pre-install the terminal. First, pass the elastic wire through the terminal. Secure it near the distal end of the elastic wire by crimping. Then, weld the terminal head to form a rounded shape.

[0039] Step 330, shaping the basket head. The basket head is shaped by a shaping fixture. After being installed in the shaping fixture, the basket head is placed in a temperature environment of 400-600°C for 10-35 minutes, then taken out and placed in room temperature water for cooling. The shaping is completed.

[0040] Step 340, proximal fixation, remove the basket head, put the limiting tube on the proximal end, and complete the proximal fixation of the basket head by crimping and welding according to the required basket length.

[0041] Compared with the prior art, the stone retrieval basket and its manufacturing method provided in this application include a basket head and a core wire. The basket head is formed into a predetermined basket shape by at least two elastic wires, and the two ends of each elastic wire are fixed. Each elastic wire is composed of a first metal wire and a coating layer sleeved or wrapped around the outer periphery of the first metal wire.

[0042] Such a configuration not only increases the cross-section of each elastic wire of the basket head, thereby improving the development effect of the basket head under X-rays; it also eliminates the need to simply increase the wire diameter of the basket wire, thereby avoiding the risk of damage to the inner wall of the tissue caused by the basket wire being too hard, and the disadvantage of affecting the pushing effect of the basket. On the contrary, the first metal wire can even use a smaller wire diameter, that is, a thinner metal wire, so that the overall elastic wire hardness is lower and softer, which can further effectively reduce the risk of damage to tissues such as the pancreatic and biliary tract inner wall mucosa during pushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] Figure 1 A schematic diagram of the overall structure of the stone extraction basket provided in the first embodiment of the present application;

[0045] Figure 2A schematic structural diagram of a basket head provided in the first embodiment of the present application;

[0046] Figure 3 A schematic structural diagram of the elastic wire provided in the first embodiment of the present application;

[0047] Figure 4 A schematic diagram of the overall structure of the stone extraction basket provided in the second embodiment of the present application;

[0048] Figure 5 A schematic structural diagram of an elastic wire provided in a second embodiment of the present application;

[0049] Figure 6 A schematic diagram of a partially cutaway structure of an elastic wire provided in a second embodiment of the present application;

[0050] Figure 7 A schematic diagram of a portion of the structure of the stone extraction basket provided in an embodiment of the present application;

[0051] Figure 8 A schematic diagram of the shape of the basket head provided in an embodiment of the present application;

[0052] Figure 9 A schematic diagram of a hose threading method according to the second embodiment of the present application;

[0053] Figure 10 Schematic diagram of fixing the elastic wire and the end provided in an embodiment of the present application.

[0054] Reference numerals:

[0055] 100- basket head;

[0056] 10- elastic thread;

[0057] 11- first metal wire;

[0058] 111-first end surface;

[0059] 12- second metal wire;

[0060] 13-Bourdon tube;

[0061] 131- second end surface;

[0062] 20-end;

[0063] 21-Mounting hole;

[0064] 22-guidewire lumen;

[0065] 30-limiting tube;

[0066] 200-core wire;

[0067] 300- basket tail;

[0068] 400-Forming tooling device. DETAILED DESCRIPTION

[0069] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0070] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0071] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0072] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0073] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0074] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0075] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0076] like Figures 1 to 10 As shown, an embodiment of the present application provides a stone retrieval basket and a manufacturing method thereof, wherein the stone retrieval basket includes a basket head 100 and a core wire 200. The basket head 100 is the front end portion of the stone retrieval basket, responsible for directly contacting and grabbing stones, etc. The core wire 200 is a slender metal wire located in the sheath of the stone retrieval basket, which plays the role of pushing the basket head 100. When inserted into the body through an endoscope, the guide wire guides the basket head 100 and the core wire 200 to the target position. The core wire 200 can be made of stainless steel or other high-strength materials.

[0077] The basket head 100 is formed of at least two elastic wires 10 shaped into a predetermined basket shape, and the two ends of each elastic wire 10 are fixed. Specifically, the predetermined basket shape can be diamond-shaped, spiral-shaped, or snare-shaped, etc., which is selected according to actual needs. Each elastic wire 10 is composed of a first metal wire 11 and a coating layer sleeved or wrapped around the outer periphery of the first metal wire 11. The first metal wire 11 can be made of nickel-titanium wire or stainless steel wire.

[0078] Compared with the prior art, the stone removal basket provided in the embodiment of the present application not only increases the cross-section of each elastic wire 10 of the basket head 100, thereby improving the imaging effect of the basket head 100 under X-rays; at the same time, there is no need to simply increase the wire diameter of the basket wire, thereby avoiding the risk of damage to the inner wall of the tissue caused by the basket wire being too hard, and the disadvantage of affecting the pushing effect of the basket. On the contrary, the first metal wire 11 can even use a smaller wire diameter, that is, a thinner metal wire, so that the overall elastic wire 10 is lower in hardness and softer, which can further effectively reduce the risk of damage to tissues such as the inner wall mucosa of the pancreatic and biliary tract during pushing.

[0079] The first metal wire 11 can be made of nickel-titanium wire or stainless steel wire. The nickel-titanium wire is made of nickel-titanium alloy, which has good elasticity and shape memory properties. This allows the first metal wire 11 formed of nickel-titanium wire to have good shape retention and memory functions. It can be opened and closed multiple times and used for stone removal multiple times during surgery, so that the basket head 100 can return to the preset basket shape without affecting the doctor's surgical operation, thereby improving the surgical efficiency and success rate.

[0080] According to the difference in the aforementioned coating layer structure, the present application provides two optional embodiments.

[0081] First embodiment

[0082] like Figures 1 to 4 As shown, the covering layer of the first embodiment is composed of multiple strands of second metal wire 12, which are wrapped around the outside of the first metal wire 11, or the multiple strands of second metal wire 12 are wrapped around the outside of the first metal wire 11 and twisted with the first metal wire 11 to form a strand of the elastic wire 10.

[0083] With such a configuration, under the same or similar wire diameter of the elastic wire 10, that is, under the same or similar imaging clarity, the elastic wire 10 of the first embodiment is relatively softer, has lower hardness, moderate hardness, and smaller cross-sectional area than the elastic wire formed by nickel-titanium monofilament or the elastic wire formed by stainless steel cable. Moreover, since the multiple strands of second metal wires 12 and the first metal wire 11 and each second metal wire 12 are formed by twisting or entangled with each other, there will be some gaps between the metal wires. In this way, under the same wire diameter, it is softer than the elastic wire formed by nickel-titanium monofilament, has moderate expansion force and wire hardness, can further effectively reduce the damage to the pancreatic and biliary tract inner wall mucosa during the basket lithotripsy process, and reduce the risk of postoperative complications.

[0084] Furthermore, the second metal wire 12 may also be made of nickel-titanium wire or stainless steel wire, and preferably nickel-titanium wire made of nickel-titanium alloy, so that the basket head 100 has good shape retention and memory functions, so that the basket head 100 can be restored to the preset basket shape during multiple opening and closing and multiple stone removal operations during the operation, without affecting the doctor's surgical operation, thereby improving the surgical efficiency and success rate.

[0085] Furthermore, the first metal wire 11 and each second metal wire 12 of each elastic wire 10 preferably have the same diameter for ease of operation and improved results. The diameter of the elastic wire 10 is determined based on the desired size of each elastic wire strand. The diameter of each first metal wire 11 and each second metal wire 12 of each elastic wire 10 is determined based on the number of wires used and the tightness of the twisting or winding.

[0086] A specific embodiment is as follows Figure 3 As shown, taking the example of each elastic wire 10 being formed by twisting one first metal wire 11 and six second metal wires 12 together, specifically, in the cross section, the first metal wire 11 can be located in the center, and the remaining multiple (such as six) second metal wires 12 can be tightly attached to each other in sequence and twisted around the circumferential spiral of the first metal wire 11 located in the center. This method is both compact and highly flexible.

[0087] Second embodiment

[0088] like Figures 4 to 6 As shown, the covering layer of the second embodiment is provided as a hose, which is sleeved or covered on the outer periphery of the first metal wire 11 along the extension direction of the first metal wire 11. The hose is a hollow structure, and the first metal wire 11 is provided through the hose.

[0089] The elastic wire 10 composed of the first metal wire 11 and the hose is preferably made of a spring tube 13 because the hose is soft and elastic, so that the elastic wire 10 has better expansion force and wire hardness.

[0090] Moreover, in the second embodiment, the first metal wire 11 preferably adopts nickel-titanium wire. The nickel-titanium wire made of nickel-titanium alloy has good memory function and shape retention function, and the hose is soft in texture and is sleeved or wrapped around the outer circumference of the nickel-titanium wire, wrapping the nickel-titanium wire. It can maintain its shape synchronously with the nickel-titanium wire and can be opened and closed multiple times and used for stone removal multiple times during the operation. The basket head 100 can return to the preset shape without affecting the doctor's surgical operation, thereby improving the efficiency and success rate of the operation.

[0091] Further, such as Figure 5 and Figure 6 As shown, the second embodiment can also adjust the average density of the cross section of each elastic wire 10 of the basket head 100 by combining two materials with different densities, so as to further improve the development effect of the basket head 100 .

[0092] Specifically, the hose can be made of a spring tube 13, preferably made of a material with a density greater than that of nickel-titanium alloy, specifically stainless steel wire; and specifically the spring tube 13 can be formed by winding or braiding to wrap the first metal wire 11.

[0093] In this configuration, the spring tube 13 is made of a stainless steel wire having a density greater than that of the first metal wire 11 made of nickel-titanium alloy, and is preferably tightly wrapped to wrap the first metal wire 11 to form a solid-like structure. On the one hand, the stainless steel wire material has a higher density than the nickel-titanium alloy material. At the same wire diameter, the average density of the cross section is greater than that of the nickel-titanium single wire, and the imaging is clearer; on the other hand, there are gaps in the braided wire material of multiple strands of stainless steel wire. At the same wire diameter, the cross section of the elastic wire 10 is larger and the imaging is clearer.

[0094] Furthermore, the spring tube 13 may be formed by winding or braiding a single layer of spring wire, or may be formed by winding or braiding at least two layers of spring wire in a stacked manner.

[0095] If a single layer of spring wire is wound or woven, the thickness of the spring tube 13 is preferably at least 0.07 mm. If multiple layers of spring wire are stacked, wound or woven, the thickness of each layer of spring wire is between 0.01 and 0.1 mm, and the number of layers should not be too many. Otherwise, under the same wire diameter, the first metal wire 11 wrapped in the spring tube 13 formed by too many layers of spring wire will be much smaller than the first metal wire 11 wrapped in the spring tube 13 formed by a single layer of spring wire. If the diameter of the first metal wire 11 is too small, the expansion force of the manufactured basket head 100 will be too weak, the basket head 100 will be too soft, and the basket shape may not be maintained.

[0096] Therefore, the number of layers of the spring tube 13 is preferably between 1 and 4, and a maximum of 4 layers is more appropriate, so that the wire diameter of the first metal wire 11 will not be too small, and the total diameter of the elastic wire 10 can reach the required size to ensure the development effect.

[0097] Correspondingly, the wire diameter of the first metal wire 11 is preferably between 0.1 and 0.4 mm, so that the wire diameter of the first metal wire 11 is neither too large nor too small, and ensures that it is neither too hard nor too soft. If the first metal wire 11 is too hard, the basket head 100 may easily cause damage to the pancreatic and biliary tract lining mucosa and other tissues when pushing out, and may affect the pushing effect of the basket head 100. If the first metal wire 11 is too soft, the expansion force of the manufactured basket head 100 may be too weak. If it is too soft, the basket shape may not be maintained.

[0098] Furthermore, if Figure 5 and Figure 6 As shown, the end surface (i.e., second end surface 131) of the aforementioned hose (e.g., spring tube 13) is flush with the end surface (i.e., first end surface 111) of the first metal wire 11, or the second end surface 131 of the hose is positioned lower than the first end surface 111 of the first metal wire 11. This ensures that the spring tube 13 completely encases the first metal wire 11, preventing leakage from the first metal wire 11, thereby ensuring a good imaging effect for the basket.

[0099] In addition, if Figure 7 As shown, the stone removal basket provided in the embodiment of the present application also includes a basket tail 300 connected to the basket head 100. The basket tail 300 is formed by the proximal extension parts of each elastic line 10 of the basket head 100 being twisted together to form a strand, so as to effectively provide stronger supporting force, thereby further improving the pushing ability of the basket.

[0100] Furthermore, if Figure 2 and Figure 4 As shown, an optional embodiment is that the basket head 100 may further include an end cap 20 fixedly disposed at the distal end of each elastic wire 10. The end cap 20 is provided with a mounting hole 21 for fixing the distal end portion of each elastic wire 10. Specifically, the first metal wire 11 and the spring tube 13 (or each second metal wire 12) at the head of the elastic wire 10 must be fixed, specifically by crimping, to completely fix the end cap 20 and the elastic wire 10, ensuring that during the opening and closing process of the basket head 100, the first metal wire 11 and the spring tube 13 (or each second metal wire 12) can move synchronously without relative displacement.

[0101] Furthermore, the end 20 may be provided with a guidewire cavity 22 for passing a guidewire to guide the basket head 100 , making it easier for doctors to perform nipple intubation and for the basket head 100 to enter the hepatic duct along the guidewire.

[0102] In another optional embodiment, the basket head 100 may further include a stopper tube 30 fixedly disposed at the proximal end of each elastic wire 10. The stopper tube 30 is hollow, and the proximal end of each elastic wire 10 is inserted into the hollow portion of the stopper tube 30 for fixation. This tube, together with the end cap 20, facilitates and restricts the shaping and forming of each elastic wire 10.

[0103] Furthermore, the distance between the limiting tube 30 and the end head 20 is preferably between 10 and 100 mm. If the limiting tube 30 is too close to the end head 20, the width and length of the basket head 100 will be reduced. If the limiting tube 30 is too far from the end head 20, the required basket shape cannot be guaranteed.

[0104] Furthermore, the present application also provides three methods for making a stone-removing net basket in an embodiment, wherein the first and second methods are used to make the stone-removing net basket of the aforementioned second embodiment, and the third method is used to make the stone-removing net basket of the aforementioned first embodiment.

[0105] The first method for manufacturing the stone-removing net basket is used to manufacture the stone-removing net basket of the second embodiment, and specifically comprises the following steps:

[0106] In step 110, the end is pre-installed. Each strand of the first metal wire 11 first passes through the end 20, and the head of the first metal wire 11 is fixedly connected to the head of the end 20 by crimping or welding. This can ensure that during the heat setting process, the welding position of the end 20 and the first metal wire 11 does not fall off, and ensure that there is a gap between the inner periphery of the end 20 and each strand of the first metal wire 11 for the subsequent installation of the hose (such as the spring tube 13).

[0107] Step 120, the basket head is shaped, such as Figure 8 As shown, after the basket head 100 is installed in the shaping fixture 400, it is placed in a temperature environment of 400 to 600°C, left for 10 to 35 minutes, taken out, and then placed in room temperature water to cool to complete the shape setting.

[0108] Step 130, threading the hose and fixing the distal end, such as Figure 9 As shown, a flexible tube is placed over the proximal end of each first metal wire 11 of the shaped mesh basket head 100 until it reaches the mounting hole 21 of the end cap 20. Since the inner diameter of the flexible tube (e.g., spring tube 13) is greater than or equal to the outer diameter of the first metal wire 11, and the flexible tube has a certain elasticity and is relatively soft, it does not affect the flexible tube's placement over the shaped first metal wire 11. The first metal wire 11 is then completely fixed to the head of the flexible tube by welding or riveting at the rear end of the end cap 20, ensuring that the first metal wire 11 and the flexible tube can move synchronously during the opening and closing of the mesh basket head 100 without relative displacement.

[0109] In step 140 , the proximal end of the basket head is fixed. The basket head 100 is removed and the limiting tube 30 is inserted from the proximal end of the basket head 100 . The basket head 100 is manufactured by crimping or welding according to the required length. It should be noted that the distance between the limiting tube 30 and the end head 20 should not be too large or too small.

[0110] The second method for manufacturing the stone-removing net basket is used to manufacture the stone-removing net basket of the second embodiment, and specifically comprises the following steps:

[0111] In step 210, the hose is pre-assembled by wrapping the outer periphery of each first metal wire 11 with a hose (such as a spring tube 13) to form each elastic wire 10, and ensuring that the end face of the first metal wire 11 (i.e., the first end face 111) is flush with the end face of the hose (i.e., the second end face 131) to cover them. After being fixed, the hose must completely wrap the first metal wire 11 without leaking out of the first metal wire 11 to ensure the development effect.

[0112] Step 220: The basket head is fixed at the far end, such as Figure 8As shown, the pre-assembled elastic wires 10 are installed into the mounting holes 21 of the end head 20. The first metal wire 11 and the hose at the head of the elastic wire 10 are fixed by crimping. Then, the head of the end head 20 is welded to form a rounded shape. The end head 20 and the head of the elastic wire 10 (including the first metal wire 11 and the hose) are completely fixed to ensure that the first metal wire 11 and the hose can move synchronously during the opening and closing of the basket head 100 without relative displacement.

[0113] Step 230 , the basket head is shaped. After the basket head 100 is installed in the shaping fixture 400 , it is placed in a temperature environment of 400 to 600° C. for 10 to 35 minutes, taken out, and then placed in room temperature water to cool to complete the shape setting.

[0114] In step 240, the proximal end of the basket head is fixed. The basket head 100 is removed and the limiting tube 30 is inserted from the proximal end of the basket head 100. The basket head 100 is manufactured by crimping and welding according to the required length. It should be noted that the distance between the limiting tube 30 and the end head 20 should not be too large or too small.

[0115] The third method for manufacturing the stone-removing net basket is used to manufacture the stone-removing net basket of the first embodiment, and specifically comprises the following steps:

[0116] Step 310 , making an elastic thread. Each elastic thread 10 is made by taking a first metal wire 11 and then taking multiple second metal wires 12 to wrap around the first metal wire 11 , or wrapping multiple second metal wires 12 around the first metal wire 11 and twisting them together to form an elastic thread 10 .

[0117] In step 320, the terminal is pre-installed. The elastic wire 10 is first passed through the terminal 20, fixed by crimping near the distal end of the elastic wire 10, and then welded to the head of the terminal 20. This can ensure that the terminal 20 and the elastic wire welding position will not fall off during the heat setting process.

[0118] Step 330, shape setting, such as Figure 8 As shown, the net basket head 100 is shaped by the shaping fixture 400. After the net basket head is installed in the shaping fixture 400, it is placed in a temperature environment of 400 to 600°C, placed for 10 to 35 minutes, taken out, and then placed in room temperature water to cool, and the shaping is completed.

[0119] Step 340 , proximal fixation, remove the basket head 100 , put the limiting tube 30 on the proximal end, and complete the proximal fixation of the basket head 100 by crimping, welding, etc. according to the required basket length.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A stone retrieval basket, comprising a basket head and a core wire, characterized in that: The basket head is formed into a predetermined basket shape by at least two elastic threads, and both ends of each elastic thread are fixed; Each of the elastic lines consists of a first metal wire and a coating layer sleeved or coated on the outer periphery of the first metal wire.

2. The stone removal basket according to claim 1, characterized in that: The coating layer is composed of multiple strands of second metal wire; A plurality of strands of the second metal wire are wrapped around the outside of the first metal wire, or A plurality of second metal wires are wrapped around the outside of the first metal wire and twisted with the first metal wire to form the elastic wire.

3. The stone removal basket according to claim 2, characterized in that: The first metal wire and the second metal wire are nickel-titanium wire or stainless steel wire.

4. The stone retrieval basket according to claim 2, characterized in that: The first metal wires and the second metal wires of each strand of the elastic thread have the same wire diameter.

5. The stone retrieval basket according to claim 1, characterized in that: The covering layer is configured as a hose having a hollow structure. The hose is sleeved or covered on the outer periphery of the first metal wire along the extension direction of the first metal wire, and the first metal wire is disposed through the hose.

6. The stone retrieval basket according to claim 5, characterized in that: The hose is configured as a spring tube, and the spring tube is formed by winding or braiding.

7. The stone removal basket according to claim 6, characterized in that: The spring tube is formed by winding or braiding a single layer of spring wire; or The spring tube is formed by stacking and winding or braiding at least two layers of spring wires.

8. The stone retrieval basket according to claim 7, characterized in that: The number of layers of the spring tube is between 1 and 4, and the thickness of each layer of the spring wire is between 0.01 and 0.1 mm; The diameter of the first metal wire is between 0.1 and 0.4 mm.

9. The stone retrieval basket according to any one of claims 6 to 8, characterized in that: The first metal wire is nickel-titanium wire or stainless steel wire; and / or The spring tube is made of stainless steel wire having a density greater than that of nickel-titanium alloy.

10. The stone retrieval basket according to claim 5, characterized in that: The end surface of the hose is flush with the end surface of the first metal wire, or An end surface of the hose is lower than an end surface of the first metal wire.

11. The stone retrieval basket according to claim 1, characterized in that: The invention also comprises a basket tail connected to the basket head. The basket tail is formed by mutually twisting and bundling the extended parts of the proximal ends of the elastic lines of the basket head into one strand.

12. The stone retrieval basket according to claim 1, characterized in that: The basket head also includes an end fixedly arranged at the distal end of each elastic line and a limiting tube fixedly arranged at the proximal end of each elastic line. The end is provided with a mounting hole for fixing each elastic line. The limiting tube is a hollow structure. The proximal end of each elastic line passes through the hollow position of the limiting tube and is fixed in position.

13. The stone retrieval basket according to claim 12, characterized in that: The end head is provided with a guide wire cavity for passing a guide wire.

14. The stone retrieval basket according to claim 12, characterized in that: The distance between the limiting tube and the end head is between 10 and 100 mm.

15. A method for making a stone-collecting basket, characterized in that: Used to make a stone-removing basket according to any one of claims 5 to 14, the manufacturing method comprising: Step 110: Pre-install the end cap. First, each strand of the first metal wire is passed through the end cap. The ends of the first metal wires are fixedly connected to the end cap by crimping or welding. A gap is ensured between the inner periphery of the end cap and each strand of the first metal wire to facilitate installation of the hose. Step 120: The basket head is shaped. After the basket head is installed in a shaping fixture, it is placed in a temperature environment of 400-600°C for 10-35 minutes, then taken out and placed in room temperature water for cooling. Step 130: Threading the hose and securing the distal end. A hose is threaded onto the proximal end of each first metal wire of the shaped basket head until it reaches the mounting hole of the endpiece. The first metal wire is then completely secured to the hose head by welding or riveting at the rear end of the endpiece. Step 140 , the proximal end of the basket head is fixed, the basket head is removed, and a limiting tube is put on the proximal end of the basket head. The basket head is completed by crimping or welding according to the required length of the basket head.

16. A method for making a stone-collecting basket, characterized in that: Used to make a stone-removing basket according to any one of claims 5 to 14, the manufacturing method comprising: Step 210: Pre-assembly of the hose wires by wrapping the hose around the outer periphery of each first metal wire to form each elastic wire, and ensuring that the end surface of the first metal wire is flush with the end surface of the hose to cover them; Step 220: The basket head is fixed at the far end, and the pre-assembled elastic wires are installed into the mounting holes of the end. The first metal wire and the hose at the end of the elastic wire are fixed by crimping, and then the end of the end is welded. Step 230: The basket head is shaped. After the basket head is installed in a shaping fixture, it is placed in a temperature environment of 400-600°C for 10-35 minutes, then taken out and placed in room temperature water for cooling. Step 240 , the proximal end of the basket head is fixed, the basket head is removed, and a limiting tube is put on the proximal end of the basket head. The basket head is completed by crimping and welding according to the required length of the basket head.

17. A method for making a stone-collecting basket, characterized in that: Used to make a stone-removing basket according to any one of claims 1 to 4, the manufacturing method comprising: Step 310, making an elastic thread, wherein each elastic thread is made of a first metal wire and multiple second metal wires are wrapped around the first metal wire, or multiple second metal wires are wrapped around the first metal wire and twisted with the first metal wire to form an elastic thread; Step 320: Pre-install the terminal. First, pass the elastic wire through the terminal. Secure it near the distal end of the elastic wire by crimping. Then, weld the terminal head to form a rounded shape. Step 330, shaping the basket head. The basket head is shaped by a shaping fixture. After being installed in the shaping fixture, the basket head is placed in a temperature environment of 400-600°C for 10-35 minutes, then taken out and placed in room temperature water for cooling. The shaping is completed. Step 340, proximal fixation, remove the basket head, put the limiting tube on the proximal end, and complete the proximal fixation of the basket head by crimping and welding according to the required basket length.

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