A method of forming a headless basket

Abstract

The present application relates to the technical field of net basket forming, in particular to a forming method of a headless net basket, which comprises the following steps: placing two middle parts of nickel-titanium alloy wires in a wire groove after mutual winding, placing the winding part in a cross groove, and fixing the wire binding assembly through a screw; installing the wire binding assembly on a bottom plate through a positioning groove, loading the same tension on four alloy wires and placing them in a wire clamping groove, and fixing and connecting the pressing block and the bottom plate through a screw; the beneficial effects are as follows: the forming method of the headless net basket has a cross groove at the top of the channel for fixing the knot part of the headless net basket, the bottom plate is used for fixing the wire binding assembly, the net basket wire passes through the channel on the wire binding assembly and is pressed by the pressing block into the fastening groove on the bottom plate, the above-mentioned forming tool with the alloy wire is treated by using a certain heat treatment process, and the headless net basket with high shape and size precision can be obtained, the processing technology is simple and efficient, and has high consistency.

Description

Technical Field

[0001] This invention relates to the field of basket molding, specifically a method for molding a headless basket. Background Technology

[0002] Bib baskets are widely used in clinical practice for endoscopic capture and removal of gallstones, ureteral stones, and foreign bodies in the upper and lower digestive tracts. There are many types of bib baskets on the market, broadly categorized as semi-circular, diamond-shaped, spiral, and headless.

[0003] In existing technologies, headless baskets, compared to traditional baskets, have no fixed head, which reduces the possibility of mucosal damage and perforation. Furthermore, they can open and capture stones even in dead angles of the cavity, thus facilitating stone capture. The headless basket consists of multiple nickel-titanium alloy wires that intersect and loop in the middle, are bundled and fixed at the tail end, and unfold into a semi-circle in the middle. However, the twisting of the alloy wires at the intersecting and knotted areas, as well as the middle section, results in significant stress and makes it generally difficult to guarantee shape accuracy.

[0004] Furthermore, most existing net baskets are made of stainless steel wire or nickel-titanium shape memory alloy wire. Compared to other materials, nickel-titanium shape memory alloy wire has a greater advantage due to its superelasticity. Its elastic limit is much greater than that of ordinary materials, and it no longer obeys Hooke's Law, meaning that even if deformed by a certain external force, it can completely recover its shape after unloading. The shaping of nickel-titanium shape memory alloy requires specific heat treatment, with high requirements for both temperature and time. Therefore, using nickel-titanium shape memory alloy wire to make headless net baskets presents certain difficulties due to the material's special properties and the complexity of the basket's shape, requiring the use of appropriate tools. Summary of the Invention

[0005] The purpose of this invention is to provide a method for forming a headless basket to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for forming a headless net basket, comprising a forming device for the headless net basket, the forming method comprising the following steps:

[0007] Two nickel-titanium alloy wires are wrapped around each other in the middle and placed in the wire groove. The wrapped part is placed in the cross-shaped groove and the wire clamping assembly is fixed with screws.

[0008] The wire clamping assembly is installed on the base plate through the positioning groove. Four nickel-titanium alloy wires are loaded with the same tension and placed in the wire clamping groove. The pressure block is fixed to the base plate with screws to press the nickel-titanium alloy wires in the wire clamping groove.

[0009] The forming device for the headless wire mesh basket containing nickel-titanium alloy wire is placed in a heat treatment furnace at a temperature of 450℃~600℃ for 5min~20min, then removed and cooled with water or air. The formed wire mesh basket is then removed from the forming device to complete the heat setting of the wire mesh basket.

[0010] Preferably, the forming device for the headless basket includes a base plate, a wire clamping assembly is inserted into the surface of the base plate, a nickel-titanium alloy wire is clamped inside the wire clamping assembly, one end of the nickel-titanium alloy wire is attached to the base plate, and a pressure block is installed on the top of the base plate by screws, the pressure block clamps and limits the nickel-titanium alloy wire.

[0011] Preferably, the base plate has an "L" shaped plate structure, and two sets of screw holes are provided on the top surface of the base plate and the surface of the pressure block. A positioning groove is provided on the bottom surface of the base plate, and a wire clamping groove is provided on the top surface of the base plate.

[0012] Preferably, the bottom surface of the pressure block is provided with a screw reinforcement assembly, and the top surface of the pressure block is provided with an anti-loosening elastic pad assembly, which is used to reinforce the screw installation in the screw hole.

[0013] Preferably, the screw reinforcement assembly includes a pre-reserved groove and a rubber plug ring. The pre-reserved groove is formed on the bottom surface of the pressure block and communicates with a screw hole. The diameter of the pre-reserved groove is larger than the diameter of the screw hole. The rubber plug ring has a frustum-shaped ring structure. One end of the rubber plug ring is fixed to the surface of the pre-reserved groove, and the other end of the rubber plug ring is inserted into a screw hole on the top surface of the base plate. The outer diameter of the other end of the rubber plug ring is smaller than the diameter of the screw hole. An embedding groove is formed on the bottom surface of the pressure block. The embedding groove is a cross-shaped groove. A rubber pad is fixed inside the embedding groove. The rubber pad is a cross-shaped block, and the thickness of the rubber pad is greater than the depth of the embedding groove.

[0014] Preferably, the anti-detachment elastic pad assembly includes an installation groove, a slot, a rubber clamp, a rubber connecting block, a metal pressure ring, an extension piece, a limiting piece, and a rubber gasket. The installation groove is an annular groove and is located on the top surface of the pressure block. The top surface of the pressure block has multiple slots that communicate with the installation groove. The rubber clamp has an annular plate structure and is fixed to the surface of the installation groove. The thickness of the rubber clamp is less than the depth of the installation groove, and a rubber connecting block is integrally formed on the outer ring surface of the rubber clamp. The rubber connecting block corresponds one-to-one with the slot, and the rubber connecting block is inserted into the slot.

[0015] Preferably, the metal pressure ring has an annular plate structure, is movably inserted into the mounting groove, and is fixed to the top surface of the rubber clamping block. Multiple extension pieces are integrally formed on the surface of the metal pressure ring, and the extension pieces correspond one-to-one with the slots. The extension pieces are slidably connected in the slots. A limiting piece is fixed on the surface of the extension piece, the thickness of which is less than the thickness of the extension piece. A rubber gasket is fixed on the bottom surface of the limiting piece.

[0016] Preferably, a pressure strip is fixed to the bottom surface of the pressure block, the pressure strip matches the wire clamping groove, and a rubber pressure sheet is fixed to the bottom surface of the pressure strip.

[0017] Preferably, the wire clamping assembly includes a wire bundle block, a wire groove, a fixing groove, a shaped groove, and a central fixing block. The wire bundle block has a square prism structure, and an isosceles trapezoidal groove is formed on the surface of the wire bundle block. There are four sets of wire bundle blocks, and the right-angled sides of the four sets of wire bundle blocks are assembled. Wire grooves are formed on both positive surfaces of the wire bundle block. The wire grooves are arc-shaped grooves. The fixing groove is formed on the surface of the wire bundle block. The fixing groove is a triangular prism groove. The screw hole is connected to the fixing groove on the surface of the wire bundle block.

[0018] Preferably, the central fixing block is a square block, located in the fixing groove of the four sets of wire bundle blocks. The surface of the central fixing block has a screw hole three, and a screw is installed in the screw hole two. One end of the screw is screwed into the screw hole three. The surface of the wire bundle block has a shaped groove, and the shaped grooves on the surface of the four sets of wire bundle blocks form a "+" shape. There are four sets of nickel-titanium alloy wires. After the four sets of nickel-titanium alloy wires are knotted, the node is located in the shaped groove. After one end of the four nickel-titanium alloy wires is bundled together, it is pushed into the wire clamping groove. The pressure block clamps the bundled nickel-titanium alloy wire.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The headless wire basket forming method proposed in this invention has a groove at the top of the channel for fixing the knotted part of the headless wire basket, and a base plate for fixing the wire clamping assembly. The nickel-titanium alloy wire passes through the channel on the wire clamping assembly and is pressed into the fastening groove on the base plate by the pressure block. The forming tool containing the alloy wire is treated with a certain heat treatment process to obtain a headless wire basket with high shape and size accuracy. The processing technology is simple, efficient and has high consistency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is an exploded view of the structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the groove structure of the present invention;

[0024] Figure 4 for Figure 3 Sectional view of AA in the middle;

[0025] Figure 5 This is a schematic diagram of the nickel-titanium alloy wire structure of the present invention;

[0026] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point A in the middle;

[0027] Figure 7 This is a schematic diagram of the pressing block structure of the present invention;

[0028] Figure 8 This is a schematic diagram of the bottom structure of the pressure block of the present invention;

[0029] Figure 9 This is a half-sectional schematic diagram of the pressing block structure of the present invention;

[0030] Figure 10 This is a schematic diagram of the mounting groove structure of the present invention;

[0031] Figure 11 This is a schematic diagram of the reserved slot structure of the present invention;

[0032] Figure 12 This is a schematic diagram of the connection structure between the rubber clamp and the metal pressure ring of the present invention;

[0033] Figure 13 This is a schematic diagram of the metal pressure ring structure of the present invention.

[0034] In the figure: base plate 1, positioning groove 101, wire clamping groove 102, wire clamping assembly 2, wire bundle block 21, wire groove 211, fixing groove 212, shaped groove 213, center fixing block 22, pressure block 3, nickel-titanium alloy wire 4, reserved groove 5, rubber plug ring 6, embedded groove 7, rubber pad 8, pressure strip 9, rubber pressure sheet 10, mounting groove 11, card groove 12, rubber clamping block 13, rubber connecting block 14, metal pressure ring 15, extension piece 16, limiting piece 17, rubber gasket 18. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit 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.

[0036] Example 1

[0037] This invention provides a technical solution: a method for forming a headless net basket, including a forming device for the headless net basket, the forming method comprising the following steps:

[0038] Two nickel-titanium alloy wires are wrapped around each other in the middle and placed in the wire groove. The wrapped part is placed in the groove and the wire clamping assembly is fixed with screws.

[0039] The wire clamping assembly is installed on the base plate through the positioning groove. Four alloy wires are loaded with the same tension and placed in the wire clamping groove. The pressure block is fixed to the base plate with screws to press the alloy wires in the wire clamping groove.

[0040] The forming device for the headless wire mesh basket containing nickel-titanium alloy wire is placed in a heat treatment furnace at a temperature of 450℃~600℃ for 5min~20min, then removed and cooled with water or air. The formed wire mesh basket is then removed from the forming device to complete the heat setting of the wire mesh basket.

[0041] Example 2

[0042] Please see Figures 1-6 Based on Embodiment 1, the forming device for the headless basket includes a base plate 1. A wire clamping assembly 2 is inserted into the surface of the base plate 1. The wire clamping assembly 2 holds a nickel-titanium alloy wire 4 inside. One end of the nickel-titanium alloy wire 4 overlaps the base plate 1. A pressure block 3 is installed on the top of the base plate 1 by screws. The pressure block 3 clamps and limits the nickel-titanium alloy wire 4. The base plate 1 has an "L"-shaped plate structure. Two sets of screw holes are opened on the top surface of the base plate 1 and the surface of the pressure block 3. A positioning groove 101 is opened on the bottom surface of the base plate 1, and a wire clamping groove 102 is opened on the top surface of the base plate 1. The wire clamping assembly 2 includes a wire bundle block 21, a wire groove 211, a fixing groove 212, a shaped groove 213, and a central fixing block 22. The wire bundle block 21 has a square prism structure. An isosceles trapezoidal groove is opened on the surface of the wire bundle block 21. There are four sets of wire bundle blocks 21. The right-angled sides of the four sets of wire bundle blocks 21 are assembled. Both positive surfaces are provided with wire grooves 211, which are arc-shaped grooves. The surface of the wire bundle block 21 is provided with a fixing groove 212, which is a triangular prism groove. The surface of the wire bundle block 21 is provided with a screw hole 2, which is connected to the fixing groove 212. The central fixing block 22 is a square block and is located in the fixing groove 212 of the four sets of wire bundle blocks 21. The surface of the central fixing block 22 is provided with a screw hole 3, in which a screw is installed. One end of the screw is screwed into the screw hole 3. The surface of the wire bundle block 21 is provided with a shaped groove 213. The shaped grooves 213 on the surfaces of the four sets of wire bundle blocks 21 form a cross shape. There are four sets of nickel-titanium alloy wires 4. After the four sets of nickel-titanium alloy wires 4 are knotted, the node is located in the shaped groove 213. One end of the four nickel-titanium alloy wires 4 is bundled together and pushed into the wire clamping groove 211. The pressure block 3 clamps the bundled nickel-titanium alloy wires 4.

[0043] Example 3

[0044] See attached document Figures 7 to 13Based on Embodiment 2, to prevent the screws fixing the pressure block 3 from loosening, a screw reinforcement assembly is provided on the bottom surface of the pressure block 3, and an anti-loosening elastic pad assembly is provided on the top surface of the pressure block 3 for reinforcing the screw installation in the screw hole 1. The screw reinforcement assembly includes a reserved groove 5 and a rubber plug ring 6. The reserved groove 5 is opened on the bottom surface of the pressure block 3 and communicates with the screw hole 1. The diameter of the reserved groove 5 is larger than the diameter of the screw hole 1. The rubber plug ring 6 has a frustum-shaped ring structure, and one end of the rubber plug ring 6 is fixed to the surface of the reserved groove 5. The other end of the rubber plug ring 6 is inserted into a screw hole on the top surface of the base plate 1. The outer diameter of the other end of the rubber plug ring 6 is smaller than the diameter of the screw hole. The bottom surface of the pressure block 3 has an embedding groove 7, which is a cross-shaped groove. A rubber pad 8 is fixed inside the embedding groove 7. The rubber pad 8 is a cross-shaped block, and the thickness of the rubber pad 8 is greater than the depth of the embedding groove 7. The anti-detachment elastic pad assembly includes an installation groove 11, a locking groove 12, a rubber clamping block 13, a rubber connecting block 14, a metal pressure ring 15, an extension piece 16, and a limiting piece 1. 7 and rubber gasket 18, mounting groove 11 is an annular groove, mounting groove 11 is opened on the top surface of pressure block 3, the top surface of pressure block 3 is provided with multiple slots 12, the slots 12 are connected to mounting groove 11, rubber clamp 13 is an annular plate structure, rubber clamp 13 is fixed on the surface of mounting groove 11, the thickness of rubber clamp 13 is less than the depth of mounting groove 11, and the outer ring surface of rubber clamp 13 is integrally formed with rubber connecting block 14, rubber connecting block 14 corresponds one-to-one with slot 12, and rubber connecting block 14 is inserted into the slot 12. In the groove 12, the metal pressure ring 15 has an annular plate structure. The metal pressure ring 15 is movably inserted into the mounting groove 11 and fixed to the top surface of the rubber clamp 13. Multiple extension pieces 16 are integrally formed on the surface of the metal pressure ring 15. The extension pieces 16 correspond one-to-one with the groove 12 and are slidably connected in the groove 12. A limiting piece 17 is fixed on the surface of the extension piece 16. The thickness of the limiting piece 17 is less than the thickness of the extension piece 16. A rubber gasket 18 is fixed on the bottom surface of the limiting piece 17.

[0045] After the pressure block 3 is attached to the top surface of the base plate 1, the rubber plug ring 6 is inserted into the first type of screw hole on the top surface of the base plate 1. After the screw passes through the screw hole on the surface of the pressure block 3 and is inserted into the screw hole on the top surface of the base plate 1, the rubber plug ring 6 is clamped in the screw and the screw hole on the top surface of the base plate 1. At this time, there is no gap between the screw and the screw hole, which strengthens the screw installation. As the screw is tightened, the top of the screw presses the metal pressure ring 15 into the mounting groove 11 until the limiting piece 17 clamps the rubber pad 18 on the top surface of the pressure block 3. At this time, the rubber clamp 13 is squeezed. The rebound force of the rubber clamp 13 pushes the metal pressure ring 15, which realizes the elastic support function for the screw installation.

[0046] 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 method for forming a headless wire basket, comprising a forming device for the headless wire basket, characterized in that, The molding method includes the following steps: Two nickel-titanium alloy wires are wrapped around each other in the middle and placed in the wire groove. The wrapped part is placed in the cross groove and the wire clamping assembly is fixed with screws. The wire clamping assembly is installed on the base plate through the positioning groove. Four nickel-titanium alloy wires are loaded with the same tension and placed in the wire clamping groove. The pressure block is fixed to the base plate with screws to press the nickel-titanium alloy wires in the wire clamping groove. The forming device for the headless wire mesh basket containing nickel-titanium alloy wire is placed in a heat treatment furnace at a temperature of 450℃~600℃ for 5min~20min, then removed and cooled with water or air. The formed wire mesh basket is then removed from the forming device to complete the heat setting of the wire mesh basket. The forming device for the headless basket includes a base plate (1), the top surface of which is provided with a wire clamping groove (102), and a wire clamping assembly (2) inserted into the surface of the base plate (1). The wire clamping assembly (2) holds a nickel-titanium alloy wire (4) inside, one end of which overlaps on the base plate (1). A pressure block (3) is installed on the top of the base plate (1) by screws, and the pressure block (3) clamps and limits the nickel-titanium alloy wire (4). The wire clamping assembly (2) includes a wire bundle block (21), a wire groove (211), a fixing groove (212), a shaped groove (213), and a central fixing block (22). The wire bundle block (21) has a square column structure, and an isosceles trapezoidal groove is provided on the surface of the wire bundle block (21). There are four sets of wire bundle blocks (21), and the right-angled sides of the four sets of wire bundle blocks (21) are assembled. Wire grooves (211) are provided on both positive surfaces of the wire bundle block (21). The wire groove (211) is an arc-shaped groove, and the surface of the wire bundle block (21) is provided with a fixing groove (212). The fixing groove (212) is a triangular prism groove. The surface of the wire bundle block (21) is provided with a screw hole II, which is connected to the fixing groove (212). The central fixing block (22) is a square block. The central fixing block (22) is located in the fixing groove (212) of the four sets of wire bundle blocks (21). The surface of the central fixing block (22) is provided with a screw hole III. A screw is installed in the screw hole II. One end of the screw is screwed into the screw hole III. The surface of the wire bundle block (21) is provided with a shaped groove (213). The shaped groove (213) on the surface of the four sets of wire bundle blocks (21) forms a cross groove. The looping and winding part is located in the cross groove. One end of the four nickel-titanium alloy wires (4) is bundled together and pushed into the wire clamping groove (102). The pressure block (3) clamps the bundled nickel-titanium alloy wires (4).

2. The method for forming a headless basket according to claim 1, characterized in that: The base plate (1) has an "L" shaped plate structure. The top surface of the base plate (1) and the surface of the pressure block (3) are provided with two sets of screw holes. The base plate (1) has a positioning groove (101) on its surface.

3. The method for forming a headless basket according to claim 2, characterized in that: The bottom surface of the pressure block (3) is provided with a screw reinforcement assembly, and the top surface of the pressure block (3) is provided with an anti-loosening elastic pad assembly, which is used to reinforce the screw installation in the screw hole.

4. The method for forming a headless basket according to claim 3, characterized in that: The screw reinforcement assembly includes a pre-reserved groove (5) and a rubber plug ring (6). The pre-reserved groove (5) is opened on the bottom surface of the pressure block (3). The pre-reserved groove (5) is connected to the screw hole 1. The diameter of the pre-reserved groove (5) is larger than the diameter of the screw hole 1. The rubber plug ring (6) has a frustum-shaped ring structure. One end of the rubber plug ring (6) is fixed on the surface of the pre-reserved groove (5). The other end of the rubber plug ring (6) is inserted into the screw hole 1 on the top surface of the base plate (1). The outer diameter of the other end of the rubber plug ring (6) is smaller than the diameter of the screw hole 1. An embedding groove (7) is opened on the bottom surface of the pressure block (3). The embedding groove (7) is a cross-shaped groove. A rubber pad (8) is fixed inside the embedding groove (7). The rubber pad (8) is a cross-shaped block. The thickness of the rubber pad (8) is greater than the depth of the embedding groove (7).

5. The method for forming a headless basket according to claim 3, characterized in that: The anti-detachment elastic pad assembly includes a mounting groove (11), a slot (12), a rubber clamp (13), a rubber connecting block (14), a metal pressure ring (15), an extension piece (16), a limiting piece (17), and a rubber gasket (18). The mounting groove (11) is an annular groove and is located on the top surface of the pressure block (3). The top surface of the pressure block (3) has multiple slots (12) that are connected to the mounting groove (11). The rubber clamp (13) is an annular plate structure and is fixed to the surface of the mounting groove (11). The thickness of the rubber clamp (13) is less than the depth of the mounting groove (11), and the outer ring surface of the rubber clamp (13) is integrally formed with a rubber connecting block (14). The rubber connecting block (14) and the slot (12) correspond one-to-one, and the rubber connecting block (14) is inserted into the slot (12); the metal pressure ring (15) has an annular plate structure, the metal pressure ring (15) is movably inserted into the mounting groove (11), and the metal pressure ring (15) is fixed on the top surface of the rubber clamp (13). The surface of the metal pressure ring (15) is integrally formed with multiple extension pieces (16), the extension pieces (16) and the slot (12) correspond one-to-one, and the extension pieces (16) are slidably connected in the slot (12). The surface of the extension pieces (16) is fixed with a limiting piece (17), the thickness of the limiting piece (17) is less than the thickness of the extension piece (16), and the bottom surface of the limiting piece (17) is fixed with a rubber pad (18).

6. The method for forming a headless basket according to claim 2, characterized in that: The bottom surface of the pressure block (3) is fixed with a pressure strip (9), which matches the wire clamping groove (102). The bottom surface of the pressure strip (9) is fixed with a rubber pressure sheet (10).

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