Coaxial direction-adjusting mesh basket convenient to control
By introducing sheath tube, net basket core and lead guidance assembly into the stone net basket, combined with elastic wire and hydrophilic coating, the flexibility and torsion control of net basket in the human body is solved, achieving rapid and accurate reach of the lesion position and reducing the risk of trauma.
Patent Information
- Application Number
- CN202421374328.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-06-17
AI Technical Summary
The existing stone net baskets are not flexible and torsionally controlled during the process of inserting into the human body, making it difficult to quickly and accurately reach the lesion position, and may cause discomfort to the patient.
A coaxial directional mesh basket is designed for easy control, using a sheath tube and a slidable mesh basket core. The mesh basket wire assembly is connected to the leading guide assembly, and an elastic metal wire and a hydrophilic coating are provided in the guide body to enhance the torque control performance and lubricity.
It improves the accuracy and safety of the net basket movement in the human cavity, reduces damage to tissues, reduces patient discomfort, improves the service life of the guide and the ability to pass through complex narrow channels.
Smart Images
Figure CN223068559U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of stone extraction baskets, and particularly relates to a coaxially adjustable basket that is convenient to control. Background Art
[0002] During the treatment of urinary system and digestive system stones, a stone extraction basket is usually used to remove the crushed stones from the human body. The current stone extraction basket is generally composed of multiple basket wires. The head ends of the basket wires are fixed together. After the basket wires extend out, the root basket wires open into an ellipsoidal shape, and then the stones are trapped and pulled out of the patient's body.
[0003] The existing basket is basically pushed to the lesion position by a sheath during the process of being inserted into the human body. Although it can be operated and used, the flexibility and torsional controllability of its end are not good, which is not conducive to quickly reaching the lesion position, and the discomfort of the patient will also be caused during the regulation process. Summary of the Invention
[0004] The purpose of the utility model is to provide a coaxially adjustable basket that is convenient to control for the problems existing in the prior art.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A coaxially adjustable basket that is convenient to control, including a sheath, and a basket core that is slidably disposed within the sheath. The end of the basket core is provided with a basket wire assembly that can extend out of the sheath. The end of the basket wire assembly is provided with a leading guiding assembly. The leading guiding assembly includes a guiding body connected to the basket wire assembly. The outer diameter of the guiding body does not exceed the outer diameter of the sheath. An elastic metal wire is disposed within the guiding body. The elastic metal wire is arranged along the length direction of the guiding body. A hydrophilic coating is further disposed on the outer periphery of the guiding body.
[0007] By improving the basket wire assembly and its guiding direction, the coaxial adjustable basket of the present utility model has better torsional control performance, is convenient for moving within the human body cavity, can quickly and accurately reach the lesion position, and is not easy to cause additional damage to human tissues, and the discomfort of the patient will also be reduced.
[0008] The leading guiding assembly is disposed at the forefront of the basket and has a good guiding and leading effect. The elastic metal wire is compounded within the guiding body, so that the guiding body not only has good strength and flexibility, but also has better elasticity and deformability, can adapt to different-shaped cavities by itself, and has good anti-fatigue performance, and is not easy to damage the tube body during long-term bending, so that the service life of the guiding body is increased.
[0009] The hydrophilic coating forms a smooth gel on the surface of the guide body after encountering liquid, which increases lubricity and reduces friction, making the catheter very lubricated and easier to insert. It also remains smooth and can pass through various complex stenosis very well, effectively reducing the risk of trauma.
[0010] In some embodiments, the elastic metal wire is spirally arranged along the length direction of the guide body, which can enhance the strength and stability of the original guide body and make the composite guide body anisotropic.
[0011] Furthermore, the spiral formed by the elastic metal wire is arranged gradually densely from one end close to the basket wire assembly to one end far away from the basket wire assembly, or the spiral formed by the elastic metal wire is arranged in a cyclic manner from sparse to dense.
[0012] In some embodiments, the elastic metal wire is arranged in the form of a sine curve and / or a cosine curve along the length direction of the guide body.
[0013] Furthermore, the elastic metal wire is a stainless steel wire or a nickel-titanium alloy wire, the hydrophilic coating is one of a PVP coating, a PAM coating, a PEG coating and a PVA coating, the guide body is a polyurethane cylinder or a fluoropolymer cylinder, and the end of the guide body is a spherical shape.
[0014] Furthermore, the basket wire assembly includes a plurality of basket wires, one end of each basket wire is connected to the basket core, and the other end of each basket wire is connected to the guide body.
[0015] Furthermore, a connecting column is provided at one end of the guide body, and the ends of multiple basket wires are assembled together to form an end knot at the end. The end knot is encapsulated in the connecting column, and a limiting ring for limiting the end knot is also provided in the connecting column, which can better fix the ends of several basket chambers and firmly connect them to the guide body.
[0016] In some embodiments, a plurality of the basket wires are further provided with a plurality of memory alloy wires on one side close to the guide body, and the plurality of memory alloy wires form a multi-circle ring structure. After the basket wires are unfolded, these memory alloy wires can also be unfolded to form an umbrella-shaped net bag structure at the end position, which is convenient for taking objects.
[0017] Furthermore, a slip ring is provided on the basket wire, and the slip ring is connected to the memory alloy wire. A plurality of limiting protrusions are also provided on the basket wire, and the slip ring is between a pair of adjacent limiting protrusions, so that it has flexibility within a certain range.
[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: 1. By improving the basket wire assembly and its guiding direction, the coaxial steering basket has better torsion control performance, facilitating its movement in the human body cavity and quickly and accurately reaching the lesion position, and is not likely to cause additional harm to human tissues; 2. The leading guiding component is arranged at the front end of the basket, with good guiding and leading functions. The elastic metal wire is compounded in the guiding body, making the guiding body not only have good strength and flexibility, but also better elasticity and adaptability, capable of self-adapting to different-shaped cavities, and having good fatigue resistance, not easily damaging the tube body during long-term bending, thus increasing the service life of the guiding body; 3. The setting of the hydrophilic coating forms a smooth gel on the surface of the guiding body after encountering liquid, increasing lubricity and reducing friction, making the catheter very lubricious, easier to insert, and continuously smooth, capable of passing through various complex narrow parts very well, effectively reducing the risk of trauma. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 Schematic diagram of a coaxial steering basket that is easy to control according to the present utility model;
[0020] Figure 2 Schematic diagram of the structure of the leading guiding component of the present utility model;
[0021] Figure 3 Schematic diagram of the arrangement of the elastic metal wire in the leading guiding component of the present utility model Figure 1 ;
[0022] Figure 4 Schematic diagram of the arrangement of the elastic metal wire in the leading guiding component of the present utility model Figure 2 ;
[0023] Figure 5 Schematic diagram of the arrangement of the elastic metal wire in the leading guiding component of the present utility model Figure 3 ;
[0024] Figure 6 Another schematic diagram of the coaxial steering basket of the present utility model;
[0025] Figure 7 is Figure 6 a connection method between the basket wire and the shape memory alloy wire in
[0026] In the figure: 1. Sheath tube; 2. Basket core; 3. Basket wire; 4. Leading guiding component; 401. Guiding body; 402. Elastic metal wire; 403. Hydrophilic coating; 404. Connecting column; 5. End knot; 6. Limiting ring; 7. Shape memory alloy wire; 8. Slip ring; 9. Limiting protrusion. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the scope of protection of the present utility model.
[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0029] As Figure 1 and Figure 2 shown, a coaxially adjustable basket that is easy to control includes a sheath tube 1 and a basket core 2 that is slidably disposed within the sheath tube 1. The end of the basket core 2 is provided with a basket wire assembly that can extend out of the sheath tube 1. The end of the basket wire assembly is provided with a leading guide assembly 4. The leading guide assembly 4 includes a guide body 401 connected to the basket wire assembly. The outer diameter of the guide body 401 is equivalent to the outer diameter of the sheath tube 1. An elastic metal wire 402 is disposed within the guide body 401. The elastic metal wire 402 is arranged along the length direction of the guide body 401. A hydrophilic coating 403 is further disposed on the outer periphery of the guide body 401.
[0030] By improving the basket wire assembly and its guiding direction, the present coaxial adjustable basket has better torsion control performance, which facilitates its movement within the human body cavity, quickly and accurately reaches the lesion location, and is not likely to cause additional damage to human tissues.
[0031] The leading guide assembly 4 is disposed at the forefront of the basket and has a good guiding and leading effect. The elastic metal wire 402 is compounded within the guide body 401, making the guide body 401 not only have good strength and flexibility, but also have better elasticity and variable adaptability. It can adapt to different-shaped cavities by itself, and has good fatigue resistance. It is not easily damaged during long-term bending, thus increasing the service life of the guide body.
[0032] The guide body 401 has both strength and flexibility, is easy to push in irregular human cavities, and has excellent maneuverability, allowing the basket to reach a specified position while also pulling the sheath to follow its path; in a normal horizontal state, the guide body 401 and the sheath 1 are coaxially arranged, and during use, when encountering bends or curves, the guide body can adapt well to changes in the path and bend or adjust its direction, thereby also driving the sheath to follow and move together.
[0033] During the process of being inserted into the human body and moving, the basket wire assembly is retracted in the sheath, and the guide body is located at the front end of the sheath, playing a leading role. When reaching the lesion location, the basket core and the basket wire assembly can be controlled to extend out of the sheath and unfold to intercept or capture foreign matter.
[0034] The hydrophilic coating 403 forms a smooth gel on the surface of the guide body 401 after encountering liquid, which increases lubricity and reduces friction, making the guide body 401 very lubricated, easier to insert, and continuously smooth, and can pass through various complex stenosis very well, effectively reducing the risk of trauma. In some embodiments, the hydrophilic coating can also be provided on the periphery of the sheath tube 1.
[0035] In some embodiments, the elastic metal wire 402 is spirally arranged along the length direction of the guide body 401 .
[0036] The elastic metal wire 402 can enhance the strength and stability of the original guide body 401 through spiral arrangement, and make the composite guide body anisotropic, with deformation properties adapted to the position under different bending states and angles, and better support provides excellent tracking and controllability.
[0037] Further, such as Figure 3 As shown, the spiral formed by the elastic metal wire 402 is arranged gradually denser from one end close to the basket wire assembly to one end away from the basket wire assembly.
[0038] According to the density of the spiral arrangement of the elastic metal wire 402, the guide body 401 can have different flexibility and elasticity at different positions. This sparse-first-dense-later arrangement makes the front end more supportive and has better pushing properties, which is conducive to the efficient placement of the advance guide component.
[0039] Or, if Figure 4 As shown, the spiral formed by the elastic metal wire 402 is arranged in a cyclic manner from sparse to dense. This arrangement is a cyclic gradual change from section to section. The sparse or dense structure allows the insertion catheter to be soft or hard.
[0040] In some embodiments, Figure 5As shown, the elastic metal wire 402 is arranged in the form of a sine curve or a cosine curve along the length direction of the guide body 401. This form of arrangement can also endow the guide body with better strength and flexibility, and is also simpler in the manufacturing process.
[0041] Or the elastic metal wire is arranged in the form of an alternation of sine curves and cosine curves along the length direction of the guide body. In this case, there are two such elastic metal wires in the guide body.
[0042] Furthermore, the elastic metal wire 402 is a stainless steel wire or a nitinol wire. One has a lower cost, and the other has better mechanical properties and a longer service life. From the perspective of the cross-sectional shape, it can be a round wire or a flat wire; the guide body 401 is a polyurethane cylinder or a fluoropolymer cylinder, and the end of the guide body 401 is spherical.
[0043] The hydrophilic coating 403 is one of a PVP coating, a PAM coating, a PEG coating, and a PVA coating. The surface of the catheter is lubricated and modified by coating with hydrophilic polymer materials such as polyvinylpyrrolidone (PVP), polyacrylamide (PAM), polyethylene glycol (PEG), polyvinyl alcohol (PVA), natural polysaccharides and derivatives. Its advantages also lie in having good mechanical properties, being easy to solve the problem of poor coating adhesion. At the same time, an antibacterial surface is constructed on the surface of the medical catheter by compounding antibacterial agents in the coating to prevent infections caused by the intervention of the medical catheter.
[0044] Furthermore, the diameter of the elastic metal wire 402 is 0.3 - 1 mm, and the average thickness of the hydrophilic coating 403 is 10 - 200 microns.
[0045] Furthermore, the basket wire assembly includes several basket wires 3. One end of the basket wire 3 converges and is connected to the basket core 2. The basket core 2 can also be a rope structure formed by twisting these basket wires into one strand. The other end of the basket wire 3 converges and is connected to the guide body 401. Depending on the number of the basket wires 3 arranged, various shapes can be formed after opening, such as a triangle, a diamond, an ellipsoid, etc.
[0046] Specifically, a connecting column 404 is provided at one end of the guide body 401. The ends of multiple basket wires 3 are assembled together and form an end knot 5 at the end. The end knot 5 is encapsulated in the connecting column 404, and a limiting ring 6 for limiting the end knot is also provided in the connecting column 404. Through this way of connection, the ends of several basket chambers can be better fixed and firmly connected to the guide body.
[0047] In some embodiments, such as Figure 6 and Figure 7As shown, a number of the wire baskets 3 are also provided with a number of shape memory alloy wires 7 on a side close to the guiding body 401, and the number of the shape memory alloy wires 7 form a multi-turn annular structure.
[0048] After the wire baskets 3 are unfolded, these shape memory alloy wires 7 can also be unfolded accordingly, forming an umbrella-shaped mesh pocket structure at the end position, which is conducive to holding foreign objects and moving them out of the body during the process of withdrawing from the wire basket.
[0049] Further, a slip ring 8 is provided on the wire basket 3, the slip ring 8 is connected to the shape memory alloy wires 7, and a number of limiting protrusions 9 are also provided on the wire basket 3, and the slip ring 8 is located between two adjacent limiting protrusions 9.
[0050] The setting of the slip ring 8 can not only connect these shape memory alloy wires 7, but also allow the ends of the shape memory alloy wires 7 to move relative to the wire basket 3, and the moving range is limited between the limiting protrusions. These small-range movements enhance its flexibility.
[0051] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A coaxially adjustable wire basket that is easy to control, comprising a sheath tube and a wire basket core slidably disposed within the sheath tube. The end of the wire basket core is provided with a wire basket wire assembly that can extend out of the sheath tube, characterized in that, The end of the wire basket assembly is provided with a leading guiding assembly, which includes a guiding body connected to the wire basket assembly. The outer diameter of the guiding body does not exceed the outer diameter of the sheath tube. An elastic metal wire is arranged inside the guiding body along the length direction of the guiding body, and a hydrophilic coating is further provided on the outer periphery of the guiding body.
2. The coaxial alignment basket that is easy to control according to claim 1, wherein The elastic metal wire is arranged in a spiral along the length direction of the guiding body.
3. The coaxial alignment basket that is convenient to control according to claim 1, wherein The spiral formed by the elastic metal wire is arranged in a gradually denser manner from the end close to the wire basket assembly to the end far from the wire basket assembly, or the spiral formed by the elastic metal wire is arranged in a gradually denser and sparser and then denser again in a segmented and cyclic manner.
4. The coaxial alignment basket that is convenient to control according to claim 1, wherein The elastic metal wire is arranged in the form of a sine curve and / or a cosine curve along the length direction of the guiding body.
5. The coaxial direction-adjustable basket that is convenient to control according to claim 1, wherein The elastic metal wire is a stainless steel wire or a nitinol wire, the hydrophilic coating is one of a PVP coating, a PAM coating, a PEG coating and a PVA coating, the guiding body is a polyurethane cylinder or a fluoropolymer cylinder, and the end of the guiding body is spherical.
6. The coaxial direction-adjustable basket that is easy to control according to claim 1, wherein The wire basket assembly includes a plurality of wire baskets. One end of each wire basket is convergently connected to the wire basket core, and the other end of each wire basket is convergently connected to the guiding body.
7. The coaxial alignment basket that is convenient to control according to claim 6, wherein A connecting column is provided at one end of the guiding body. The ends of a plurality of the wire baskets are compiled together to form an end knot at the end, and the end knot is encapsulated in the connecting column. A limiting ring for limiting the end knot is further provided in the connecting column.
8. The coaxial alignment basket that is easy to control according to claim 6, wherein A plurality of shape memory alloy wires are further provided on one side of the plurality of wire baskets close to the guiding body, and the plurality of shape memory alloy wires form a multi-turn annular structure.
9. The coaxial alignment basket that is convenient to control according to claim 8, wherein Slip rings are provided on the wire baskets, and the slip rings are connected to the shape memory alloy wires. A plurality of limiting protrusions are further provided on the wire baskets, and the slip rings are located between a pair of adjacent limiting protrusions.