A stone-removing net basket with a stable head structure

Abstract

The present invention provides a stone-removing basket with a stable head structure, comprising a clamping ring and a composite wire, wherein the clamping ring is provided with a plurality of fixing holes, the axes of the fixing holes have a certain angle, a connector of the composite wire enters the fixing hole and is fixed thereto, and the ends of all the composite wires are gathered into a bundle at the position where the cable is installed to form the rear end of the basket. The present invention replaces the traditional winding point with a clamping ring structure, and the connector of the composite wire enters the fixing hole of the clamping ring and is fixed, so the reliability is better, and the controllability of the basket in the extraction operation is improved. The material used to form the connector of the present invention is preferably a stainless steel tube, so the shortcomings of the prior art that the nickel-titanium alloy material is difficult to weld and prone to cold welding are effectively improved. The part other than the connector is nickel-titanium alloy wire, which can meet the material requirements of medical equipment.

Description

Technical Field

[0001] The invention relates to the field of medical instruments, and in particular to a stone removal net basket with a stable head structure. Background Art

[0002] With the increasing popularity of endoscopic technology and minimally invasive treatment, the use of minimally invasive diagnosis and treatment to treat digestive and urinary system stones has become an important technology in the medical industry. At present, the existing stone removal baskets in the field of minimally invasive stone removal can be divided into two categories: stone removal baskets with guide heads and stone removal baskets without guide heads, depending on whether there is a guide head at the front end.

[0003] The guide head type stone extraction basket has a metal guide head at the front end of the basket. The guide head is a hollow structure in which multiple basket wires are fixed. The connection method between the basket wire and the guide head is usually extrusion fixation or welding. The basket wire is distributed in a spiral, diamond, ellipsoid, or spindle shape along the circumference, which is called the basket body. The rear end of the basket body is fixedly connected to the cable. Since the extrusion fixation effect is not obvious, and the nickel-titanium basket wire is difficult to weld due to the characteristics of the material itself, the guide head and the basket wire are often loose or separated.

[0004] like Figure 1 As shown in the figure, the characteristic of the guideless stone-removing basket is that there is no guide head at the front end of the basket body, but a plurality of basket wires are wound around each other to form a winding point. The basket wires are distributed in a spiral, diamond, ellipsoid, or spindle shape along the circumference with the winding point as the starting point to form the basket body, and the rear end of the basket body is fixedly connected to the cable.

[0005] But if Figure 2 As shown in the figure, the limitation of the guideless stone retrieval basket is that the winding point is unstable, prone to deformation, displacement and loosening. The loose winding point will make it difficult for the basket to maintain its original shape. Compared with the tight state, the loose winding point will absorb the tension of the basket wire, causing the basket to malfunction and thus stone retrieval failure.

[0006] In order to reduce the impact of loose winding points on clinical use, some manufacturers have tried to reinforce the winding points by welding. However, since nickel-titanium basket wire is difficult to weld and prone to cold welding, the effect is not ideal. Summary of the invention

[0007] The present invention aims at the deficiencies of the prior art and proposes a stone removal basket with a stable head structure by replacing the traditional winding point with a clamping ring structure. Through the improvement of the present invention, a more stable connection structure can be obtained, and the failure probability during clinical use can be reduced.

[0008] The technical scheme of the present invention is as follows:

[0009] A stone-removing basket with a stable head structure, characterized in that it includes a clamping ring and a composite wire, wherein the clamping ring is provided with a plurality of fixing holes, the axes of the fixing holes have a certain angle between them, a connector of the composite wire enters the fixing hole and is fixed thereto, and the ends of all the composite wires are gathered into a bundle to form the rear end of the basket; the composite wire is integrally drawn and annealed multiple times from a metal tube and the metal wire inside it, and after the metal tube and the metal wire drawn into the metal wire are tightly wrapped, only the outer metal tube of the connector is left, and the outer metal tube of the other parts is removed to expose the inner metal wire; the part of the connector in the fixing hole is fixedly connected to the fixing hole; the metal tube is an easily welded metal, and the metal wire is a nickel-titanium alloy or a nickel-titanium-based alloy.

[0010] The connector is located in the middle of the composite wire.

[0011] The metal tube of the composite wire is a stainless steel tube.

[0012] The closest spacing between the fixing holes is 0-10 mm; the length of the fixing holes is 0.3-5 mm and the diameter is 0.15-2 mm; the length of the connector is 0.1-10 mm and the thickness is 0.05-1.5 mm.

[0013] The connector is located at one end of the composite wire, and the connectors of the two composite wires are respectively placed at the two ends of a fixing hole and fixed thereto.

[0014] The cross-sectional shape of the fixing hole on the clamp ring can be O-shaped or C-shaped.

[0015] When the fixing hole is C-shaped, after the connector of the composite wire enters the fixing hole, the connector and the fixing hole are welded at the notch position of the C-shape. After welding, the notch is also welded together to form a closed shape of the fixing hole.

[0016] The inner diameter of the fixing hole is larger than the outer diameter of the connecting body. When the connecting body is placed in the fixing hole, the notch is first clamped by external force, and then welding is performed at the position of the notch.

[0017] A stone-removing basket with a stable head structure, characterized in that it comprises a plurality of composite wires fixed together in the middle; the composite wire is integrally drawn and annealed multiple times by a metal tube and the metal wires inside the metal tube, and after the metal tube and the metal wires drawn into the metal wires are tightly wrapped, only the outer metal tube of the connector is left, and the outer metal tubes of the other parts are removed to expose the inner metal wires; the connector is located in the middle of the composite wire; the metal tube is an easily welded metal, and the metal wires are nickel-titanium alloy or nickel-titanium-based alloy; the connectors of all the composite wires are fixed together at a certain angle, and the ends are gathered into a bundle to form the rear end of the basket.

[0018] One side of the connector is processed into a plane, and the planes of the connectors of adjacent composite wires are fixed together.

[0019] The technical effects of the present invention are as follows:

[0020] The present invention provides a stone-removing basket with a stable head structure, comprising a clamp ring and a composite wire, wherein the clamp ring is provided with a plurality of fixing holes, the axes of the fixing holes have a certain angle, the connector of the composite wire enters the fixing hole and is fixed thereto, and the ends of all the composite wires are gathered into a bundle at the cable to form the rear end of the basket. The present invention replaces the traditional winding point with a clamp ring structure, the connector of the composite wire enters the fixing hole of the clamp ring and is fixed, the structural reliability of the basket head is better, and the controllability of the basket in the retrieval operation is improved.

[0021] In order to overcome the problem that nickel-titanium alloys are difficult to weld, whether between the same material or with other metals, the material used to form the connector in the present invention is preferably a stainless steel tube, which effectively solves the shortcomings of nickel-titanium alloy materials in the prior art that are difficult to weld and prone to cold welding; and the parts other than the connector are nickel-titanium alloy wires, which can meet the material requirements of medical devices.

[0022] The composite wire of the present invention is integrally drawn and annealed multiple times by a metal tube and the metal wire inside it, and then most of the outer metal tube except the connector is removed to expose the inner metal wire, and the main body of the stone-removing basket is formed by the metal wire. Since the connector and the metal wire are tightly wrapped, and its outer surface is an arc surface adapted to the inner surface of the fixing hole, the connector and the fixing hole can better form a fixed connection relationship, so that the metal wire is fixed at the clamping ring to form a connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the stone-taking basket without a guide head in the prior art.

[0024] Figure 2 This is a schematic diagram of the prior art of the non-guided stone extraction basket clamp ring being loosened during use

[0025] Figure 3 Schematic diagram of the stone-taking basket structure of the first embodiment of the present invention

[0026] Figure 4 , Figure 5 Schematic diagram of the clamp structure of the first embodiment of the present invention

[0027] Figure 6 This is a schematic diagram of the structure of the composite wire in which the connector is arranged in the middle of the embodiment 1 of the present invention.

[0028] Figure 7 , Figure 8Schematic diagram of two composite wires passing through a clamp ring in Embodiment 1 of the present invention

[0029] Fig. 9 Schematic diagram of the clamp structure of the second embodiment of the present invention

[0030] Fig.10 , Fig.11 Schematic diagram of two composite wires passing through a clamp ring in Embodiment 2 of the present invention

[0031] Fig.12 Schematic diagram of the welding of the clamp ring in the second embodiment of the present invention

[0032] Fig.13 This is a schematic diagram of the stone-taking basket structure of the second embodiment of the present invention.

[0033] Fig.14 Schematic diagram of the composite wire structure in which the connector is arranged at one end in the fourth embodiment of the present invention

[0034] Fig.15 Schematic diagram of four composite wires inserted into two fixing holes in the fourth embodiment of the present invention

[0035] Fig.16 This is a schematic diagram of the installation of two composite wires in Example 5 of the present invention.

[0036] Fig.17 This is a schematic diagram of a connector after one side of the fifth embodiment of the present invention is processed into a plane.

[0037] Fig.18 Schematic diagram of two composite wire connectors connected in plane in Embodiment 5 of the present invention

[0038] Fig.19 Schematic diagram of the stone-taking basket structure of the fifth embodiment of the present invention DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Example 1

[0040] like Figure 3 As shown, the stone-removing basket with a stable head structure of the present invention comprises a clamp ring 1, a composite wire 2, and a cable 3, wherein the clamp ring 1 is provided with one or more fixing holes 4, the fixing holes 4 are through holes with an O-shaped cross-section, and the composite wire 2 passes through the fixing holes 4 to form a basket head. The two ends of the composite wire 2 are gathered into a bundle to form a basket rear end 5, and the basket rear end 5 is fixedly connected to the cable 3.

[0041] like Figure 4 , Figure 5As shown, in this embodiment, a circumferentially closed fixing hole 4 is processed on the clamp 1 by laser processing, electric spark wire cutting machine, electric spark forming machine and other processing methods. The fixing holes 4 are not connected to each other, and the composite wire 2 is fixed to the fixing hole 4. The fixing holes 4 are located in the upper and lower layers and the angle between the axes is 0 to 180°. The closest distance between the two fixing holes 4 is 0 to 10 mm. The length of the fixing holes 4 is 0.3 to 5 mm and the diameter is 0.15 to 2 mm. The size of the fixing hole 4 is consistent with or slightly larger than the size of the composite wire 2.

[0042] The composite wire 2 is a composite wire made by inserting a single nickel-titanium wire into a stainless steel tube and drawing it. After integral drawing and multiple annealing, the nickel-titanium wire in the stainless steel tube is stretched into a wire shape.

[0043] like Figure 6 As shown, the stainless steel tubes at the head and tail of each composite wire 2 are removed to form a stripped portion where the nickel-titanium wire is exposed, and the stainless steel tube is retained in the middle to form a connector 6. The stainless steel tube of the connector 6 is 0.1-10 mm long and 0.05-1.5 mm thick.

[0044] like Figure 7 , Figure 8 As shown, the connector 6 of the composite wire 2 enters the fixing hole 4 of the clamp 1 and is fixed by welding. After welding, the angle between two adjacent composite wires 2 is 0-180°. The stripping part of the composite wire 2 takes the clamp 1 as the starting point and is distributed in a spiral, diamond, ellipsoid, or spindle shape along the circumferential direction to form a basket.

[0045] The composite yarn manufacturing method of the present invention comprises the following steps:

[0046] S1. inserting one or more metal wires into a metal tube for integral drawing and multiple annealing;

[0047] S2, cold drawing until the wire diameter is required for making the stone-taking net basket to form a composite wire;

[0048] S3. After the pulling is completed, the outer metal tube of a specific part is removed according to the shape of the stone removal basket to expose the inner metal wire.

[0049] In step S1, the annealing temperature is 600-900°C, preferably 700-800°C.

[0050] In step S2, the cold drawing deformation amount is 20%-50%, preferably 30%-40%.

[0051] The metal wire is a stainless steel wire or a nickel-titanium wire, and the metal tube can be a nickel-titanium tube or a stainless steel tube. The metal tube and metal wire of the medical composite wire can include a variety of combinations: inserting a single nickel-titanium wire into a stainless steel tube for drawing, placing multiple nickel-titanium wires (or stainless steel wires) in a stainless steel tube for drawing, etc. Example 2

[0052] like Fig. 9 As shown, the difference between this embodiment and embodiment 1 is that the fixing hole 4 on the clamp ring 1 has a notch 7 along the axial direction, so that the cross-sectional shape of the fixing hole 4 is C-shaped. The connector 6 of the composite wire 2 enters the fixing hole 4 of the clamp ring 1 and is fixed.

[0053] like Fig.10 , Fig.11 As shown, after the connector 6 of the composite wire 2 enters the fixing hole 4, the connector 6 and the fixing hole 4 are welded at the position of the notch 7, so that the composite wire 2 and the clamp 1 are firmly combined. While welding the connector 6 and the fixing hole 4, the notch 7 is also filled with welding material, so that the fixing hole 4 forms a closed shape.

[0054] Fig.12 As shown, after the welding is completed, the angle between two adjacent composite wires 2 is 0-180°, and then the composite wire 2 is shaped as shown in FIG. Fig.13 The basket shape shown. Example 3

[0055] The difference between this embodiment and embodiment 2 is that the inner diameter of the fixing hole 4 is larger than the outer diameter of the connector 6. When the connector 6 is placed in the fixing hole 4, the notch 7 on the fixing hole 4 is clamped by external force to fasten the connector 6 in the fixing hole 4. Then, a laser welding machine is used to weld at the position of the notch 7. After welding is completed, due to the dual guarantee of fastening and welding, the composite wire 2 is difficult to slip out of the hole of the clamp 1. Example 4

[0056] The difference between this embodiment and embodiments 1-3 is that Fig.14 As shown, the connecting body 6 is at one end of the composite wire 2 , and the two composite wires 2 share a fixing hole 4 .

[0057] like Fig.15 As shown, the connectors 6 of the two composite wires 2 are respectively inserted into the two ends of the fixing holes 4, and then fixed by welding. Since there is an angle between the axes of the fixing holes 4, the angle between the composite wires 2 in different fixing holes 4 is 0-180°. The stripping part of the composite wire 2 takes the clamp ring 1 as the starting point and is distributed in a spiral, diamond, ellipsoid, or spindle shape along the circumferential direction to form a basket. Example 5

[0058] The difference between this embodiment and the first embodiment is that the composite wire 2 is not fixed by the clamping ring 1, but the connector 6 on the composite wire 2 is directly welded.

[0059] Specifically, the composite yarn 2 is first prepared according to the method of Example 4, and then Figure 6 As shown, the stainless steel tubes at the head and tail of each composite wire 2 are removed to form a stripped portion where the stainless steel wire is exposed, and the stainless steel tube is retained in the middle to form a connector 6. The stainless steel tube of the connector 6 is 0.1-10 mm long and 0.05-1.5 mm thick.

[0060] like Fig.16 As shown, the connector 6 of one composite wire 2 is placed on the connector 6 of another composite wire 2, and the connectors 6 of the two wires are placed close to each other with a certain angle between them. The connectors 6 of the two composite wires 2 are welded to firmly combine the two.

[0061] like Fig.17 As shown, in order to increase the contact area, one side of the connector 6 can be processed into a plane 8 by grinding, wire cutting, electric spark forming machine or other methods, and then the planes 8 of the two composite wires 2 are firmly combined together by welding.

[0062] like Fig.18 As shown, after welding is completed, since the outer side of the connector 6 is wrapped with a metal tube layer, the angle between two adjacent composite wires 2 can be maintained at 0 to 180 degrees. Fig.19 The basket shape shown.

[0063] It should be noted that the above-described specific implementations can enable those skilled in the art to more fully understand the invention, but do not limit the invention in any way. Therefore, although this specification has described the invention in detail with reference to the drawings and embodiments, those skilled in the art should understand that the invention can still be modified or replaced by equivalents. In short, all technical solutions and improvements that do not deviate from the spirit and scope of the invention should be included in the protection scope of the patent for the invention.

Claims

1. A stone-removing basket with a stable head structure. Features: It includes a clamp ring and a composite wire, wherein the clamp ring is provided with a plurality of fixing holes, the axes of the fixing holes have a certain angle, the connector of the composite wire enters the fixing holes and is fixed thereto, and the ends of all the composite wires are gathered into a bundle to form the rear end of the basket; The cross-sectional shape of the fixing hole on the clamp ring is C-shaped; The composite wire is drawn as a whole and annealed multiple times by the metal tube and the metal wire inside it. After the metal tube and the metal wire drawn into the metal wire are tightly wrapped, only the outer metal tube of the connector is left, and the outer metal tube of the other parts is removed to expose the inner metal wire; the part of the connector in the fixing hole is fixedly connected to the fixing hole; The metal tube is made of easily weldable metal, and the metal wire is made of nickel-titanium alloy.

2. A stone-removing basket with a stable head structure as claimed in claim 1, Features: The connector is located in the middle of the composite wire.

3. A stone-removing basket with a stable head structure as claimed in claim 2, Features: The metal tube of the composite wire is a stainless steel tube.

4. A stone-removing basket with a stable head structure as claimed in claim 2, Features: The closest spacing between the fixing holes is 0-10 mm; the length of the fixing holes is 0.3-5 mm and the diameter is 0.15-2 mm; the length of the connector is 0.1-10 mm and the thickness is 0.05-1.5 mm.

5. A stone-removing basket with a stable head structure as claimed in claim 1, Features: The connector is located at one end of the composite wire, and the connectors of the two composite wires are respectively placed at the two ends of a fixing hole and fixed thereto.

6. A stone-removing basket with a stable head structure as claimed in claim 1, Features: When the fixing hole is C-shaped, after the connector of the composite wire enters the fixing hole, the connector and the fixing hole are welded at the notch position of the C-shape. After welding, the notch is also welded together to form a closed shape of the fixing hole.

7. A stone-removing basket with a stable head structure as claimed in claim 6, Features: The inner diameter of the fixing hole is larger than the outer diameter of the connecting body. When the connecting body is placed in the fixing hole, the notch is first clamped by external force, and then welding is performed at the position of the notch.

8. A stone-removing basket with a stable head structure. Features: It includes a plurality of composite wires fixed together in the middle; the composite wire is drawn as a whole and annealed multiple times by a metal tube and the metal wire inside it, after the metal tube and the metal wire drawn into the metal wire are tightly wrapped, only the outer metal tube of the connector is left, and the outer metal tube of the other parts is removed to expose the inner metal wire; the connector is located in the middle of the composite wire; the metal tube is an easily welded metal, and the metal wire is a nickel-titanium alloy; The connectors of all the composite wires are fixed together at a certain angle, and the ends are gathered into a bundle to form the rear end of the basket.

9. A stone-removing basket with a stable head structure as claimed in claim 8, Features: One side of the connector is processed into a plane, and the planes of the connectors of adjacent composite wires are fixed together.

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