Passive opening and closing single pipe network basket, umbrella sheath and manufacturing method

Abstract

The application discloses a passive opening and closing type single tube net basket, an umbrella sheath and a manufacturing method. The single tube net basket comprises a net basket tube body, a net part formed by a plurality of memory alloy wires connected with the net basket tube body, and a net basket end head formed by converging one end of the plurality of memory alloy wires. The net basket tube body has an axial hollow channel. The hollow channel is used for inserting a medical device which can be inserted and extracted to reach or leave an area where the net part is located. The single tube net basket further comprises a long core rod which is used for pressing against the net basket end head to make the net part fold. The passive opening and closing type single tube net basket can obtain a single tube net basket structure through improvement on a structural form. In use, the single tube net basket can be independently used without cooperation of an outer tube and can be used in cooperation with a tube mirror, a sheath tube and the like to complete some object taking operations. Moreover, the whole structure is simple, and the strength and flexibility are good.

Description

Technical Field

[0001] This invention relates to the field of medical device manufacturing technology, specifically to a passively opening and closing single-tube basket, a sheath, and a manufacturing method thereof. Background Technology

[0002] A basket is a common tool in medical devices, widely used for retrieving stones and objects from inside the human body. One end of the basket typically has a mesh structure. The mesh fibers pass through an outer tube and connect to an external handle. Pulling the fibers allows the mesh to enter or exit the outer tube, thus opening or closing the basket. This type of basket generally requires an outer tube for the mesh fibers to pass through, which increases the basket's outer diameter, and the basket itself does not provide a passage for external instruments. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a passively opening and closing single-tube basket, umbrella sheath, and manufacturing method.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] On one hand, a passively opening and closing single-tube basket is provided, including a basket tube body, a mesh section formed by multiple shape memory alloy wires connected to the basket tube body, and a basket end formed by the convergence of one end of the multiple shape memory alloy wires. The other end of the multiple shape memory alloy wires extends and rheologically forms the basket tube body, and the basket tube body has an axial hollow channel. The hollow channel is used to insert a removable medical device to reach or leave the area where the mesh section is located.

[0006] It also includes a long core rod, which is removably disposed in the hollow channel to hold the end of the basket together so that the net is gathered.

[0007] This passively opening and closing single-tube basket, through structural improvements, yields a single-tube basket structure that can be used independently without the need for an outer tube, or in conjunction with endoscopes, sheaths, etc., to perform certain retrieval operations. Furthermore, the overall structure is simple, with good strength and flexibility.

[0008] Furthermore, the inner wall of the basket tube is provided with an ultra-slippery coating, which facilitates the pushing and pulling movement of the basket tube and also makes it convenient for the insertion and movement of instruments such as electrode wires, laser fibers, and biopsy forceps.

[0009] Furthermore, one end of the long core rod is provided with an arc-shaped top, and the other end of the long core rod is provided with a locking mechanism that is detachably connected to the basket tube body. When the locking mechanism is connected to the basket tube body, the top abuts against the end of the basket and tightens the net to a size not exceeding the outer diameter of the basket tube body.

[0010] The locking mechanism is designed to lock with the end of the basket tube after the long core rod is inserted into place and the net section is retracted, preventing relative sliding between the two and facilitating the overall insertion and removal.

[0011] Furthermore, the locking mechanism is an end cap disposed at the end of the long core rod. The opening of the end cap faces the length extension direction of the long core rod. The inner circumference of the opening of the end cap is provided with an internal thread, and the outer circumference of the end of the basket tube is provided with an external thread that mates with the internal thread. This threaded engagement is convenient to use and easy to manufacture.

[0012] A method for manufacturing a passively opening and closing single-tube basket, the method comprising the following steps:

[0013] Take multiple shape memory alloy wires, set the front ends of the multiple shape memory alloy wires in a mesh structure on the shaping mold, and wind or weave the middle and rear ends of the multiple shape memory alloy wires in parallel on the mandrel behind the shaping mold. After shaping, the mesh part and the mesh tube wound or woven by the shape memory alloy wires are obtained.

[0014] The shape memory alloy wire is wound or woven into a mesh tube by polymer material heat flow transformation to form a tubular mesh basket body. Multiple shape memory alloy wires are left with a 2-4mm end at the front end of the mesh basket mold as the mesh basket end. A coaxial hydrophilic head or loach head is connected in front of the mesh basket end.

[0015] External threads are machined at the end of the basket tube; based on the length of the basket tube and the opening and closing dimensions of the mesh section, a long core rod with an end cap is machined, and an internal thread that matches the external thread is machined on the inner circumference of the end cap.

[0016] On the other hand, a passively opening and closing umbrella sheath is provided, including an umbrella sheath tube body, the end of which is provided with an end ring, and the end ring is connected to an umbrella-shaped curved wire; in the natural state, the umbrella-shaped curved wire is in a closed state; in use, the above-mentioned passively opening and closing single-tube net basket is inserted into the umbrella sheath tube body, the net part is connected to the umbrella-shaped curved wire, and the umbrella-shaped curved wire unfolds when the net part is opened.

[0017] Furthermore, the umbrella-shaped curved wire forms at least four continuous umbrella-shaped sections, the root of which is connected to the end ring, and the end of which gradually narrows, maintaining a gap with the adjacent umbrella-shaped sections.

[0018] Furthermore, in the folded state, the umbrella-shaped curved wire has an overall conical structure with an axial length of not less than 10 mm and a taper of 3 to 8 degrees.

[0019] Furthermore, both the umbrella-shaped curved wire and the end ring are made of stainless steel wire or nickel-titanium alloy wire, and a polymer film is also provided on the outer periphery of the umbrella-shaped curved wire.

[0020] A method for manufacturing a passively opening and closing umbrella sheath includes the following steps:

[0021] Take a metal wire, bend the metal wire into a continuous wave shape, weld the two ends of the wave-shaped metal wire together to form a ring wave, put the ring wave on an umbrella-shaped mold and bind and shape it towards the center to obtain a conical umbrella-shaped bent wire.

[0022] An end ring is made, and the troughs of the umbrella-shaped curved wire are sequentially welded onto the end ring; the end ring is connected to the end of the umbrella sheath tube body, and after welding, a film is applied to the umbrella-shaped curved wire and the end ring to obtain the passive opening and closing umbrella sheath.

[0023] In some implementations, the passively opening and closing umbrella sheath can also be manufactured in the following manner:

[0024] Take a metal tube and cut annular wavy umbrella-shaped curved wires at the end of the metal tube; cut the metal tube with the umbrella-shaped curved wires to a suitable length for later use.

[0025] A connecting groove is made in the peripheral wall of the end of the umbrella sheath tube. A metal tube of appropriate length is inserted into the connecting groove and fixed. After fixing, a film is applied to the umbrella-shaped curved wire and the metal tube to obtain the passive opening and closing umbrella sheath.

[0026] Compared with the prior art, the beneficial effects of the present invention are: 1. By improving its structural form, the passive opening and closing single-tube basket of this invention can obtain a single-tube basket structure that can be used independently without the cooperation of an outer tube, or in conjunction with a scope, sheath, etc., to complete some retrieval operations; moreover, the overall structure is simple, and the strength and flexibility are both good; 2. The empty channel can not only be used to insert electrode wires, biopsy forceps, and other instruments, but also can be used in conjunction with the long core rod to allow the mesh to retract in the initial stage so that it can enter various cavities; 3. The basket tube itself is formed by the shape memory alloy wire that forms the mesh through the flow of polymer materials, and has good integrity and flexibility. That is to say, in the passive opening and closing single-tube basket, the shape memory alloy wire that forms the mesh is set in the tube wall of the basket tube, forming an integrated structure; 4. The long core rod is placed along the basket tube The hollow channel of the body allows for the application of external force to retract the mesh section. In this state, the entire single-tube basket can smoothly enter medical instruments such as endoscopes and sheaths. After reaching the designated position, the long core rod is pulled out, and the mesh section opens automatically. Electrode wires, optical fibers, or biopsy forceps can be inserted through the hollow channel to perform surgical operations such as retrieval of objects or stones in the lesion area of ​​the human body. 5. This passively opening and closing umbrella sheath adopts a continuous wave-shaped curved filament as the umbrella structure of the umbrella sheath, which can reduce the overall manufacturing difficulty and achieve a passive opening and closing effect. The curved filament is in a retracted state in its natural state so that the entire umbrella sheath can enter the human cavity, avoiding damage to the human cavity caused by the open umbrella section. When the end of the umbrella sheath tube reaches the predetermined position, it can be opened by the action of the passively opening and closing single-tube basket, forming a cooperative use with the basket. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the unfolded structure of a passively opening and closing single-tube basket according to the present invention.

[0028] Figure 2 This is a schematic diagram of the folding structure of a passively opening and closing single-tube basket according to the present invention.

[0029] Figure 3 This is a schematic diagram of the structure of the long core rod of the present invention;

[0030] Figure 4 This is a schematic diagram of a passively opening and closing single-tube basket of the present invention used in conjunction with different cavities;

[0031] Figure 5 This is a schematic diagram of the cross-sectional structure of a passively opening and closing single-tube basket inserted into a telescope according to the present invention.

[0032] Figure 6 This is a schematic diagram of the cross-sectional structure of a passively opening and closing single-tube basket inserted into a sheath tube according to the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of a passively opening and closing single-tube umbrella sheath according to the present invention;

[0034] Figure 8 This is a front view of the end of a passively opening and closing single-tube umbrella sheath according to the present invention;

[0035] Figure 9 This is a top view of the end of a passively opening and closing single-tube umbrella sheath according to the present invention;

[0036] Figure 10 This is a schematic diagram of the structure of the umbrella-shaped curved filaments laid out according to the present invention;

[0037] Figure 11 This is a schematic diagram illustrating the manufacturing process of a passively opening and closing single-tube umbrella sheath according to the present invention. Figure 1 ;

[0038] Figure 12 This is a schematic diagram illustrating the manufacturing process of a passively opening and closing single-tube umbrella sheath according to the present invention. Figure 2 ;

[0039] Figure 13 This is a schematic diagram illustrating the manufacturing process of a passively opening and closing single-tube umbrella sheath according to the present invention. Figure 3 ;

[0040] In the diagram: 1. Net basket tube body; 2. Net section; 3. Net basket end; 4. Shape memory alloy wire; 5. Hollow channel; 6. Long core rod; 7. End cap; 8. Tube end; 9. Sheath tube; 10. Umbrella sheath tube body; 11. End ring; 12. Umbrella-shaped curved wire; 13. First cutting path; 14. Second cutting path; 15. Connecting groove. Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terms "middle," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1

[0043] On the one hand, such as Figures 1-3 As shown, a passively opening and closing single-tube basket is provided, including a basket tube body 1, a mesh section 2 formed by multiple shape memory alloy wires 4 connected to the basket tube body 1, and a basket end 3 formed by the convergence of one end of the multiple shape memory alloy wires 4. The other end of the multiple shape memory alloy wires 4 extends and rheologically forms the basket tube body 1. The basket tube body 1 has an axial hollow channel 5. The hollow channel 5 is used to insert a removable medical device to reach or leave the area where the mesh section is located.

[0044] It also includes a long core rod 6, which is removably disposed in the hollow channel 5 and is used to hold the end 3 of the basket so that the net section 2 is gathered.

[0045] This passively opening and closing single-tube basket, through structural improvements, yields a single-tube basket structure that can be used independently without the need for an outer tube, or in conjunction with endoscopes, sheaths, etc., to perform certain retrieval operations. Furthermore, the overall structure is simple, with good strength and flexibility.

[0046] The hollow channel 5 can be used not only to insert electrode wires, biopsy forceps and other instruments, but also to work with the long core rod 6 to initially gather the mesh so that it can enter various cavities.

[0047] The long core rod 6 is designed to passively retract the mesh portion of the single-tube basket using an external object. The mesh portion opens by relying on the shape memory of the shape memory alloy wire, but retraction requires the assistance of the long core rod.

[0048] This passively opening and closing single-tube basket differs significantly from existing baskets not only in structure but also in its usage. Structurally, this passively opening and closing single-tube basket features a hollow channel coaxial with itself, eliminating the need for an outer tube. The basket tube itself is formed by the shape memory alloy wires that create the mesh section, achieved through polymer material flow, resulting in good integrity and flexibility. In other words, the shape memory alloy wires that form the mesh section in this passively opening and closing single-tube basket are integrated within the tube wall, forming a unified structure. Based on this... This structural design distinguishes it from existing baskets in use. The mesh section is naturally open, and without an outer tube, it cannot close automatically, making it inconvenient to insert into medical devices such as endoscopes and sheaths. Therefore, a long core rod is incorporated. This long core rod is inserted along the hollow channel of the basket's tube body. When the end of the long core rod abuts against the end of the basket, a certain external force is applied to close the mesh section. In this state, the entire single-tube basket can smoothly enter medical devices such as endoscopes 8 and sheaths 9 (e.g., ...). Figures 4-6As shown in the diagram, after reaching the designated position, the long core rod is pulled out, and the mesh section opens automatically. Electrode wires, optical fibers, or biopsy forceps can be inserted through the hollow channel to facilitate surgical procedures such as retrieving objects or stones from the lesion area. The sheath described in this patent is not the outer tube of the basket and needs to be distinguished from the basket sheath in the prior art, as some literature also refers to the outer tube of the basket as a sheath.

[0049] The advantage of not having an outer tube is that it reduces the overall outer diameter of the basket and increases the size of its internal hollow channel. This allows it to accommodate various medical instruments in small cavities, as well as other instruments to pass through it, and also enables the removal of larger stones. Furthermore, during subsequent adjustments, the basket can be controlled solely by its own tubing without the need for an outer tube.

[0050] The basket tube 1, formed by combining the shape memory alloy wire 4 with the rheological properties of polymer materials, enhances the strength and flexibility of the basket tube compared to the metal wire placed inside. It also provides better elasticity and adaptability, allowing it to adapt to different shapes and bend at multiple angles without damage. This gives it good flexibility and the ability to adapt to the tortuous changes of human body cavities. Furthermore, it has good fatigue resistance and is not easily damaged during long-term bending, thus increasing the service life of this single-tube basket.

[0051] Furthermore, the inner and outer walls of the basket tube 1 are respectively provided with a super-slippery coating. The super-slippery coating facilitates the pushing and pulling movement of the basket tube 1, and also facilitates the insertion of instruments such as electrode wires, laser fibers, and biopsy forceps.

[0052] It should be noted that the electrode wire refers to the electrode guide wire used in electrohydraulic lithotripsy. The electrode guide wire breaks up the stones trapped in the mesh. In this method, the mesh basket can be used directly as the channel for the electrode guide wire to enter the body, eliminating the need for additional cavities or devices. This allows for more targeted and accurate breaking up of the stones trapped in the mesh. The laser fiber is a fiber guide wire used in holmium laser lithotripsy, and it can also be arranged using this mesh basket.

[0053] Furthermore, the basket end 3 is connected and fixed with a hydrophilic head or a 10-50mm loach head, which improves the head directionality and passage of the entire single-tube basket, and enhances its integrity and damage-free operation. The basket end 3 is 1-4mm long and is the end where multiple shape memory alloy wires 4 converge, allowing the ends of these wires to be fixedly connected together to form a stable and robust structure. The length of the basket tube varies from tens of centimeters to several meters.

[0054] Furthermore, one end of the long core rod 6 is provided with an arc-shaped top, and the other end of the long core rod 6 is provided with a locking mechanism that is detachably connected to the basket tube 1. When the locking mechanism is connected to the basket tube 1, the top abuts against the basket end 3 and causes the net part 2 to be tightened and closed to not exceed the outer diameter of the basket tube 1.

[0055] The basket tube 1 and the long core rod 6 are quite long. If the locking mechanism is not provided at their ends, the long core rod can slide relative to the basket tube. This would make it difficult to ensure the convergence of the net section and the controllability of the basket tube during the long-distance insertion of the single-tube basket. Therefore, the locking mechanism is provided. After the long core rod 6 is inserted into place and the net section 2 is retracted, it locks to the end of the basket tube 1, preventing relative sliding. This facilitates the overall insertion and removal. The top head is designed to pass through the hollow channel and hold the end of the basket in place.

[0056] Furthermore, the locking mechanism is an end cap 7 disposed at the end of the long core rod 6. The opening of the end cap 7 faces the length extension direction of the long core rod 6. The inner circumference of the opening of the end cap 7 is provided with an internal thread, and the outer circumference of the end of the basket tube 1 is provided with an external thread that mates with the internal thread.

[0057] The end cap 7 can be a nut-like structure, which can easily connect the end of the long core rod 6 to the end of the basket tube 1 by using the cooperation of internal and external threads. It is also easy to unlock it later to pull out the long core rod 6, leaving only the basket tube in the cavity of the inserted endoscope or sheath.

[0058] On the other hand, this embodiment also provides a method for manufacturing a passively opening and closing single-tube basket, the method comprising the following steps:

[0059] Take multiple shape memory alloy wires, set the front ends of the multiple shape memory alloy wires in a mesh structure on the shaping mold, and wind or weave the middle and rear ends of the multiple shape memory alloy wires in parallel on the mandrel behind the shaping mold. After shaping, the mesh part and the mesh tube wound or woven by the shape memory alloy wires are obtained.

[0060] The shape memory alloy wire is wound or woven into a mesh tube by polymer material heat flow transformation to form a tubular mesh basket body. Multiple shape memory alloy wires are left with a 1-4mm gap at the front end of the mesh basket mold as the end of the mesh basket. A coaxial hydrophilic head or loach head is connected in front of the end of the mesh basket.

[0061] External threads are machined at the end of the basket tube; based on the length of the basket tube and the opening and closing dimensions of the mesh section, a long core rod with an end cap is machined, and an internal thread that matches the external thread is machined on the inner circumference of the end cap.

[0062] In this manufacturing method, after the mesh section is formed, a relatively long shape memory alloy wire remains behind it. These excess wires are directly formed into a mesh tube by winding, weaving, or straightening. The mesh tube is then subjected to polymer thermal fluidization on a mold to form a tubular mesh basket body. This method not only creates a coaxial hollow channel but also allows the tube wall to contain shape memory alloy wires, making it more resilient and stronger. This manufacturing method not only facilitates the production of such single-tube mesh baskets but also reduces waste of shape memory alloy wires, eliminating the need to remove excess wires from the mesh section, thus saving materials and reducing production costs.

[0063] The long core rod can be customized according to the length and inner diameter of the basket tube. By setting the external thread and the internal thread respectively, the two can be connected together during use. Example 2

[0064] This embodiment provides a passively opening and closing umbrella sheath, which can be used in conjunction with the passively opening and closing single-tube net basket in Embodiment 1, and the umbrella sheath is opened through the passively opening and closing single-tube net basket.

[0065] Specifically, such as Figures 7-10 As shown, a passively opening and closing umbrella sheath includes an umbrella sheath tube 10, with an end ring 11 at the end of the umbrella sheath tube 10, and an umbrella-shaped curved wire 12 connected to the end ring 11. In its natural state, the umbrella-shaped curved wire 12 is in a closed state. In use, the above-mentioned passively opening and closing single-tube net basket is inserted into the umbrella sheath tube 10, and the net part 2 extends to the umbrella-shaped curved wire 12. The umbrella-shaped curved wire 12 unfolds when the net part 2 is opened.

[0066] In practice, this passively opening and closing single-tube basket extends from the end of the umbrella-shaped sheath tube, causing the umbrella-shaped curved wires to open. The mesh automatically opens and traps the stone when it reaches the stone. By appropriately moving the stone so that it is within the range of the opened umbrella-shaped curved wires, the electrode wires extending from the basket tube can be used to break the stone. During this process, the mesh trapping the stone allows the electrodes to break it more accurately. Combined with the further protection of the umbrella-shaped curved wires, it can prevent the stone fragments from scattering and ensure that the stone does not bounce, achieving complete removal. The umbrella-shaped curved wires can also form a protective umbrella for the body cavity, preventing the stone fragments from scratching the body cavity.

[0067] This passively opening and closing umbrella sheath uses a continuous wave-shaped curved wire 12 as the umbrella structure of the sheath, which can reduce the overall manufacturing difficulty and also achieve the effect of passive opening and closing. The curved wire 12 is in a closed state in its natural state so that the entire umbrella sheath can enter the human body cavity and avoid damage to the human body cavity caused by the spread umbrella part. When the end of the umbrella sheath tube 10 reaches the predetermined position, it can be opened under the action of the passively opening and closing single tube net basket, and form a cooperative operation with the net basket.

[0068] Furthermore, the umbrella-shaped curved wire 12 forms at least four continuous umbrella-shaped sections, the root of which is connected to the end ring 11, and the ends of which gradually narrow, maintaining a gap with adjacent umbrella-shaped sections.

[0069] Furthermore, in the folded state, the umbrella-shaped curved wire 12 has an overall conical structure with an axial length of not less than 10 mm and a taper of 3 to 8 degrees. Preferably, the axial length is about 15 mm, the taper is about 5 degrees, the individual diameter of the umbrella-shaped curved wire 12 is about 0.15 mm, and the outer diameter of the end ring 11 is about 4.35 mm and the inner diameter is about 0.42 mm.

[0070] Furthermore, both the umbrella-shaped curved wire 12 and the end ring 11 are made of stainless steel wire or nickel-titanium alloy wire, and a polymer film is provided on the outer periphery of the umbrella-shaped curved wire. The polymer film provides restraint and resilience. After the mesh portion of the single-tube basket exits the umbrella-shaped area formed by the umbrella-shaped curved wire, the umbrella-shaped curved wire closes itself to its initial state under the resilience of the polymer film.

[0071] This embodiment further provides a method for manufacturing a passively opening and closing umbrella sheath, including the following steps:

[0072] Take a metal wire, bend the metal wire into a continuous wave shape, weld the two ends of the wave-shaped metal wire together to form a ring wave, put the ring wave on an umbrella-shaped mold and bind and shape it towards the center to obtain a conical umbrella-shaped bent wire.

[0073] An end ring is made, and the troughs of the umbrella-shaped curved wire are sequentially welded onto the end ring; the end ring is connected to the end of the umbrella sheath tube body, and after welding, a film is applied to the umbrella-shaped curved wire and the end ring to obtain the passive opening and closing umbrella sheath.

[0074] The above manufacturing method involves first preparing the umbrella-shaped curved wire and the end ring, then welding them together as a whole and connecting and fixing them to the umbrella sheath tube body. In this process, the end ring can be welded to the metal wire inside the umbrella sheath tube body, or the polymer material can be fused to the polymer material on the umbrella sheath tube body after coating.

[0075] In other embodiments, the passively opening and closing umbrella sheath can also be manufactured in the following manner:

[0076] Take a metal tube and cut annular wavy umbrella-shaped curved wires at the end of the metal tube; cut the metal tube with the umbrella-shaped curved wires to a suitable length for later use.

[0077] A connecting groove is made in the peripheral wall of the end of the umbrella sheath tube. A metal tube of appropriate length is inserted into the connecting groove. After connection and fixation, a film is coated on the umbrella-shaped curved wire and the metal tube to obtain the passive opening and closing umbrella sheath.

[0078] In this embodiment, the umbrella-shaped curved wire with end rings is formed by cutting. This manufacturing method is simpler and more feasible, and reduces the difficulty of welding. Because welding alloy wires of a few tenths of a millimeter is difficult, cutting is a more convenient way to remove material. Although it is simpler than welding, this cutting process still requires designing the cutting path and controlling the dimensions, which is different from the existing tube cutting and forming methods.

[0079] Specifically, such as Figure 11 As shown, firstly, a wavy first cutting path 13 is designed at the end of the metal tube, and then the end is cut into a wavy shape along the first cutting path 13; then, as shown... Figure 12 As shown, a second cutting path 14, similar to but lower than the aforementioned wavy cutting path, is designed at the wavy end. Below this cutting path is an annular cutting path. Cutting along this path removes material, resulting in a tube with a wavy, umbrella-shaped curved wire 12. The upper portion is then cut according to the insertion length to obtain the umbrella-shaped curved wire 12 with an insertion base (end ring). Figure 13 As shown, an annular connecting groove 15 is opened at the end of the umbrella sheath tube 10, and an umbrella-shaped curved wire 12 with a plug-in base (end ring) can be connected to it.

[0080] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A passive open-close single-pipe grid, characterized by, The device includes a basket tube body, a mesh section formed by multiple shape memory alloy wires connected to the basket tube body, and a basket end formed by the convergence of one end of the multiple shape memory alloy wires. The other end of the multiple shape memory alloy wires extends and rheologically forms the basket tube body. The basket tube body has an axial hollow channel. The hollow channel is used to insert a removable medical device to reach or leave the area where the mesh section is located. It also includes a long core rod, which is removably disposed in the hollow channel to hold the end of the basket closed. One end of the long core rod is provided with an arc-shaped top, and the other end of the long core rod is provided with a locking mechanism that is detachably connected to the basket tube. When the locking mechanism is connected to the basket tube, the top abuts the end of the basket and tightens the basket closed to a size not exceeding the outer diameter of the basket tube.

2. The passive open / close single-pipe grid basket of claim 1, wherein, The inner wall of the basket tube is coated with an ultra-slippery coating.

3. The passive open / close single-pipe grid basket of claim 1, wherein, The locking mechanism is an end cap located at the end of the long core rod. The opening of the end cap faces the direction of the length extension of the long core rod. The inner circumference of the opening of the end cap is provided with an internal thread, and the outer circumference of the end of the basket tube is provided with an external thread that mates with the internal thread.

4. A method of making a passive opening and closing single-pipe network basket according to any one of claims 1 to 3, characterized in that, The manufacturing method includes the following steps: Take multiple shape memory alloy wires, set the front ends of the multiple shape memory alloy wires in a mesh structure on the shaping mold, and wind or weave the middle and rear ends of the multiple shape memory alloy wires in parallel on the mandrel behind the shaping mold. After shaping, the mesh part and the mesh tube wound or woven by the shape memory alloy wires are obtained. The shape memory alloy wire is wound or woven into a mesh tube by polymer material heat flow transformation to form a tubular mesh basket body. Multiple shape memory alloy wires are left with a 1-4mm end at the front end of the mesh basket mold as the mesh basket end. A coaxial hydrophilic head or loach head is connected in front of the mesh basket end. External threads are machined at the end of the basket tube; based on the length of the basket tube and the opening and closing dimensions of the mesh section, a long core rod with an end cap is machined, and an internal thread that mates with the external thread is machined on the inner circumference of the end cap.

5. A passive open-close umbrella sheath, characterized by, The device includes an umbrella-shaped sheath tube, with an end ring at one end, and an umbrella-shaped curved wire connected to the end ring. In its natural state, the umbrella-shaped curved wire is in a closed state. In use, the passively opening and closing single-tube net basket according to any one of claims 1 to 3 is inserted into the umbrella-shaped sheath tube. The long core rod is inserted along the hollow channel of the net basket tube. When the end of the long core rod abuts against the end of the net basket, an external force is applied to close the net section. The net section is connected to the umbrella-shaped curved wire. When the long core rod is pulled out, the net section opens by itself, and the umbrella-shaped curved wire unfolds along with the net section when it opens.

6. The passive open-close umbrella sheath according to claim 5, characterized in that, The umbrella-shaped curved wire forms at least four continuous umbrella-shaped sections, the root of which is connected to the end ring. The ends of the umbrella-shaped sections gradually narrow, maintaining a gap with adjacent umbrella-shaped sections.

7. The passive open-close umbrella sheath according to claim 5, wherein, In the folded state, the umbrella-shaped curved wire has an overall conical structure with an axial length of not less than 10 mm and a taper of 3 to 8 degrees.

8. The passive open-close umbrella sheath according to claim 5, wherein, The material of the umbrella-shaped bent wire and the end ring is stainless steel wire or nickel-titanium alloy wire, and the outer periphery of the umbrella-shaped bent wire is further provided with a polymer film.

9. A method of making a passive open-close umbrella canopy according to claim 5, wherein, The method comprises the following steps: a metal wire is taken, the metal wire is bent into a continuous wave shape, the two ends of the wave-shaped metal wire are welded together to form a ring wave, the ring wave is sleeved on an umbrella-shaped mold to be bound and shaped in the middle part, and a tapered umbrella-shaped bent wire is obtained; an end ring is made, the wave troughs of the umbrella-shaped bent wire are welded on the end ring in sequence, the end ring is connected to the end of the umbrella sheath pipe body, and after welding, a film is coated on the umbrella-shaped bent wire and the end ring to obtain the passive opening and closing type umbrella sheath.

10. A method of making a passive open-close umbrella canopy according to claim 5, characterized in that, The method comprises the following steps: a metal pipe is taken, an umbrella-shaped bent wire in a ring wave shape is cut at the end of the metal pipe, and the metal pipe with the umbrella-shaped bent wire is cut to a proper length for use; a connecting groove is formed in the end peripheral wall of the umbrella sheath pipe body, the metal pipe cut to the proper length is inserted into the connecting groove, and after being fixed, a film is coated on the umbrella-shaped bent wire and the metal pipe to obtain the passive opening and closing type umbrella sheath.

Images