Medical cage type metal support forming die and forming method

Abstract

The invention belongs to the technical field of medical support forming, and particularly relates to a medical cage type metal support forming mold and a forming method. The medical cage type metal support forming die comprises a profiling die and a forming die, wherein a support forming cavity used for containing a support is formed in the profiling die; the stretching assembly is used for stretching into the support forming cavity to fix the support to the inner wall of the support forming cavity in a stretching mode. According to the medical cage type metal support forming die, the support is stretched and positioned to the inner wall of the support forming cavity in the profiling die in a stretching mode, and a cage type closed support can be successfully formed. By means of the mode, the modeling and the size of the product can better meet the 3D modeling requirement.

Description

Technical Field

[0001] The invention belongs to the technical field of medical stent molding, and in particular relates to a medical cage-type metal stent molding die and a molding method. Background Art

[0002] Heart stents, also known as coronary artery stents, are commonly used medical devices in cardiac interventional surgery and have the function of clearing arterial blood vessels. Medical metal stents generally need to be positioned and formed through a mold, and then the entire mold is placed in a heat treatment furnace for heat treatment and final shaping.

[0003] Existing literature mainly focuses on the design of artificial heart stent product structure, while there are few patent documents on molding mold solutions. Patent CN113101014A discloses "a method for manufacturing an artificial heart valve stent", and the processing method mentioned is mainly aimed at spatial winding products with wire as raw materials, and cannot process products with pipes as raw materials and the overall structure is a rotating body.

[0004] In the above-mentioned patented technology, the existing metal bracket expansion and shaping scheme mainly uses tooling built into the bracket to expand the diameter and shape it. This scheme is mainly suitable for open bracket structures, where tooling can be built in; and for "cage-type" closed structure bracket products, because the internal support tooling cannot be placed inside the bracket, it is not suitable for the shaping of "cage-type" closed brackets. Summary of the invention

[0005] The purpose of the invention is to provide a medical cage-type metal bracket forming die and a forming method.

[0006] In order to solve the above technical problems, the present invention provides a medical cage-type metal stent forming mold, comprising:

[0007] A profiling mold, wherein a stent forming cavity for accommodating the stent is provided inside the mold;

[0008] The stretching component is used to extend into the bracket forming cavity to stretch and fix the bracket to the inner wall of the bracket forming cavity.

[0009] In one embodiment of the present application, the profiling mold comprises:

[0010] A contoured base, the interior of which is provided with a lower contoured cavity for accommodating the lower portion of the bracket;

[0011] A fixing assembly, used to fix the lower portion of the bracket in the lower contour cavity;

[0012] The upper mold assembly is used for covering the profiling base, and an upper profiling cavity is arranged in the upper mold assembly; the upper profiling cavity and the lower profiling cavity constitute the bracket forming cavity.

[0013] In one embodiment of the present application, the fixing assembly includes:

[0014] A contour positioning block, the upper portion of which is used to be arranged inside the bracket, and the lower end of which is used to extend from the lower side of the contour base;

[0015] The locking nut is used to cooperate with the lower end of the contour positioning block; wherein

[0016] When the locking nut locks the profiling positioning block and the profiling base, the profiling positioning block presses the lower part of the bracket against the inner wall of the lower profiling cavity.

[0017] In one embodiment of the present application, the upper mold assembly includes a plurality of stacked mold sheets, and the inner side of the mold sheet is provided with a profiling hole for forming an upper profiling cavity;

[0018] The mold sheet is provided with a plurality of positioning holes for the stretching components to pass through.

[0019] In one embodiment of the present application, the stretching assembly includes a plurality of U-shaped fixing wires, which are used to extend from the upper contour cavity to stretch and fix the corresponding position on the bracket to the corresponding position on the inner wall of the upper contour cavity.

[0020] In one embodiment of the present application, the profiling mold further comprises:

[0021] A positioning pin is used to pass through the contoured base and the upper die set; the upper and lower ends of the positioning pin are both provided with pin holes;

[0022] The upper and lower latches are respectively used to be inserted into corresponding latch holes to fix the positioning pins to the contoured base and the upper die set.

[0023] Accordingly, the present invention provides a method for forming a medical cage-type metal stent, comprising:

[0024] Step 1: Insert the contoured positioning block into the inner side of the lower part of the bracket to form an assembly;

[0025] Step 2: Insert the completed assembly into the lower contour cavity of the contour base, and tighten the locking nut on the lower end of the contour positioning block;

[0026] Step 3: Insert the positioning pin into the pin hole on the contoured base, and insert the lower pin into the pin hole at the lower end of the positioning pin;

[0027] Step 4: Install the first layer of mold pieces on the contoured base;

[0028] Step 5: Insert the U-shaped fixing wire according to the positioning hole on the first layer of the mold sheet, fix the U-shaped fixing wire and stretch the bracket connection node outward, so that the bracket fits the inner surface of the contoured hole on the inner side of the mold sheet, and tie the U-shaped fixing wire to fix it;

[0029] Step 6: Repeat the operation of step 5 to install the remaining mold pieces and U-shaped fixing wires in sequence;

[0030] Step 7: After all the mold pieces are installed, insert the upper latch into the latch hole at the upper end of the locating pin to fix the entire mold.

[0031] The beneficial effect of the present invention is that the medical cage-type metal stent forming mold of the present invention comprises: a profiling mold, which is provided with a stent forming cavity for accommodating the stent; and a stretching assembly, which is used to extend into the stent forming cavity to stretch and fix the stent to the inner wall of the stent forming cavity. The medical cage-type metal stent forming mold of the present invention can successfully form a "cage-type" closed stent by stretching and positioning the stent to the inner wall of the stent forming cavity inside the profiling mold. This method can make the shape and size of the product better meet the 3D modeling requirements.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 is a schematic diagram comparing the stent before and after forming of a preferred embodiment of the present invention;

[0036] Figure 2 is a planar cross-sectional view of a medical cage-type metal stent forming die according to a preferred embodiment of the present invention;

[0037] Figure 3 is a three-dimensional cross-sectional view of a medical cage-type metal stent forming mold according to a preferred embodiment of the present invention;

[0038] Figure 4 is a schematic diagram of a mold sheet according to a preferred embodiment of the present invention;

[0039] Figure 5 It is a schematic diagram of the cooperation between the fixing assembly and the contoured base in the preferred embodiment of the present invention;

[0040] Figure 6 It is a schematic diagram of the cooperation between the mold sheet and the contoured base in a preferred embodiment of the present invention;

[0041] Figure 7 It is a stereoscopic view of a medical cage-type metal stent forming mold according to a preferred embodiment of the present invention.

[0042] In the figure:

[0043] The profiling mold 1, the bracket forming cavity 101, the profiling base 11, the lower profiling cavity 111, the fixing component 12, the profiling positioning block 121, the locking nut 122, the stretching component 2, the U-shaped fixing wire 21, the upper mold group 13, the upper profiling cavity 130, the mold sheet 131, the profiling hole 132, the positioning hole 133, the positioning pin 14, the pin hole 141, the upper pin 15, the lower pin 16, the bracket 100, and the connecting node 200. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In one application scenario, see Figure 1 Before forming, the bracket 100 is in a hollow cylindrical shape, and the middle part needs to be expanded to form a spindle-shaped structure. The upper connection nodes 200 of the bracket 100 are denser, and the lower part is sparser, that is, the hollow holes in the upper part are smaller, and the hollow holes in the lower part are larger.

[0046] The existing scheme for expanding and shaping the diameter of metal stents mainly involves using tooling built into the stent for expansion and shaping. This scheme is mainly suitable for open stent structures where tooling can be built in. However, for "cage-type" closed structure stent products, since the internal support tooling cannot be placed inside the stent, it is not suitable for shaping the "cage-type" closed stent.

[0047] Based on this, see Figure 2 In one embodiment of the present application, a medical cage-type metal stent forming mold is provided, which includes:

[0048] A profiling mold 1, wherein a stent forming cavity 101 for accommodating the stent is provided inside the profiling mold 1;

[0049] The stretching assembly 2 is used to extend into the stent forming cavity 101 to stretch and fix the stent to the inner wall of the stent forming cavity 101 .

[0050] In this embodiment, the "cage-type" closed stent 100 can be successfully formed by stretching the stent 100 to the inner wall of the stent forming cavity 101 inside the profiling mold 1. This method can make the shape and size of the product better meet the 3D modeling requirements.

[0051] For details, see Figure 3 The profiling mold 1 includes: a profiling base 11, which is provided with a lower profiling cavity 111 for accommodating the lower part of the bracket; a fixing component 12, which is used to fix the lower part of the bracket in the lower profiling cavity 111; an upper mold group 13, which is used to cover the profiling base 11, and the upper mold group 13 is provided with an upper profiling cavity 130; the upper profiling cavity 130 and the lower profiling cavity 111 constitute the bracket forming cavity 101.

[0052] In this embodiment, the profiling mold 1 is a split structure, and its support molding cavity 101 is formed by the profiling base 11 and the upper mold assembly 13. The lower part of the support node 200 with relatively sparse nodes is fixed in the lower profiling cavity 111 for molding, and then the upper middle part of the support node 200 with relatively dense nodes is molded by the upper mold assembly 13.

[0053] For details, see Figure 3 and Figure 5 The fixing assembly 12 includes: a contour positioning block 121, the upper part of which is used to be set inside the bracket, and the lower end is used to extend from the lower side of the contour base 11; a locking nut 122, which is used to cooperate with the lower end of the contour positioning block 121; when the locking nut 122 locks the contour positioning block 121 with the contour base 11, the contour positioning block 121 presses the lower part of the bracket against the inner wall of the lower contour cavity 111.

[0054] In this embodiment, the hollow hole at the bottom of the bracket node 200 is relatively large, so the contoured positioning block 121 can be inserted into the bracket 100; the outer wall of the contoured positioning block 121 is adapted to the lower contoured cavity 111, and the two clamp the lower part of the positioning bracket; the lower end of the contoured positioning block 121 can extend from the lower end surface of the contoured base 11, and the locking nut 122 cooperates with its thread; during the locking process of the locking nut 122, the contoured positioning block 121 is gradually pulled down, so that the contoured positioning block 121 and the lower contoured cavity 111 clamp and fix the bracket.

[0055] For further information, see Figure 3 and Figure 4 The upper mold assembly 13 includes a plurality of stacked mold sheets 131, the inner side of which is provided with profiling holes 132 for forming an upper profiling cavity 130; the mold sheet 131 is provided with a plurality of positioning holes 133 for the stretching assembly 2 to pass through.

[0056] In this embodiment, the connection nodes 200 on the bracket 100 can be divided into several layers according to the height of each connection node 200, and each layer of connection nodes 200 corresponds to a layer of mold sheet 131; for example, see Figure 3 , the mold sheet 131 is provided with 5 layers. The inner side of each layer of mold sheet 131 is provided with a profiling hole 132 that is highly profiling with the bracket 100, and all the profiling holes 132 constitute an upper profiling cavity 130. Each layer of mold sheet 131 is provided with a positioning hole 133 that penetrates the inner and outer sides of the mold sheet 131 at each connection node 200, for allowing the stretching component 2 to pass through.

[0057] Furthermore, the stretching assembly 2 may include a plurality of U-shaped fixing wires 21 , which are used to extend from the upper contour cavity 130 to stretch and fix the corresponding position on the stent to the corresponding position on the inner wall of the upper contour cavity 130 .

[0058] For details, see Figure 3 and Figure 4 The two wire ends of the U-shaped fixing wire 21 can be respectively passed through the corresponding positioning holes 133 and then tied, so that the corresponding connection node 200 is tied tightly to the inner wall of the contoured hole 132.

[0059] For further information, see Figures 2 to 7 Optionally, the profiling mold 1 also includes: a positioning pin 14, which is used to pass through the profiling base 11 and the upper mold group 13; the upper and lower ends of the positioning pin 14 are both provided with a pin hole 141; an upper pin 15 and a lower pin 16, which are respectively used to insert into the corresponding pin holes 141 to fix the positioning pin 14 to the profiling base 11 and the upper mold group 13.

[0060] In this embodiment, the contour base 11 and each mold piece 131 have pin holes for the positioning pin 14 to pass through; after the contour base 11 and each mold piece 131 are assembled, the positioning pin 14 is passed through the pin hole, and then the upper plug pin 15 and the lower plug pin 16 are respectively passed through the corresponding plug holes 141 on the positioning pin 14, so that the mold as a whole can be fixed.

[0061] In this embodiment, the contoured base 11 and each mold piece 131 are separately arranged, and the local mold piece can be adjusted according to different bracket shapes to adapt to a wide range of scenarios; the contoured base 11 and each mold piece 131 are located on the outside of the bracket, which is convenient for disassembly and assembly.

[0062] Accordingly, based on the above embodiments, an embodiment of the present application further provides a method for forming a medical cage-type metal stent, which specifically includes:

[0063] Step 1: See Figure 5 , insert the contoured positioning block 121 into the inner side of the lower part of the bracket 100 to form an assembly;

[0064] Step 2: insert the assembly completed in step 1 into the lower profiling cavity 111 of the profiling base 11, and tighten the locking nut 122 on the lower end of the profiling positioning block 121;

[0065] Step 3: Insert the positioning pin 14 into the pin hole on the contoured base 11, and insert the lower plug pin into the plug hole at the lower end of the positioning pin 14;

[0066] Step 4: See Figure 6 , installing a first layer of mold sheet 131 on the contoured base 11;

[0067] Step 5: Insert the U-shaped fixing wire 21 through the positioning hole 133 on the first layer of the mold sheet 131, fix the U-shaped fixing wire 21 and stretch the bracket connection node 200 outward, so that the bracket fits the inner surface of the inner contour hole 132 of the mold sheet 131, and tie the U-shaped fixing wire 21 to fix it;

[0068] Step 6: Repeat the operation of step 5 to install the remaining mold pieces 131 and the U-shaped fixing wires 21 in sequence;

[0069] Step 7: After the mold pieces 131 are all installed, insert the upper latch into the latch hole at the upper end of the positioning pin 14 to fix the entire mold, see Figure 7 .

[0070] After the entire mold is fixed, the mold can be placed in a heat treatment device. After a certain period of heat preservation, the bracket 100 is shaped, and the mold can be removed to take out the bracket.

[0071] In summary, the medical cage-type metal stent forming mold of the present invention provides a reference for the forming method of such products, making up for the lack of forming methods in this regard; the layered mold structure is convenient for assembly during the product forming process, and the product structure can be locally optimized and adjusted; because the stent profiling surface is on the outside, the assembly of the mold inside the stent is avoided, reducing the risk of stent breakage during the assembly process.

[0072] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0073] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection.

[0074] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0075] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A medical cage-type metal stent forming mold, characterized in that: include: A profiling mold (1) having a stent forming cavity (101) disposed therein for accommodating the stent; The stretching assembly (2) is used to extend into the stent forming cavity (101) to stretch and fix the stent to the inner wall of the stent forming cavity (101).

2. The medical cage-type metal stent forming mold according to claim 1, characterized in that: The profiling die (1) comprises: A contoured base (11) is provided with a lower contoured cavity (111) for accommodating the lower part of the bracket; A fixing assembly (12) for fixing the lower portion of the bracket in the lower contoured cavity (111); The upper mold assembly (13) is used to cover the contoured base (11), and an upper contoured cavity (130) is arranged in the upper mold assembly (13); the upper contoured cavity (130) and the lower contoured cavity (111) constitute the bracket forming cavity (101).

3. The medical cage-type metal stent forming mold according to claim 2, characterized in that: The fixing assembly (12) comprises: A contour positioning block (121), the upper portion of which is arranged inside the bracket and the lower end of which is extended from the lower side of the contour base (11); The locking nut (122) is used to cooperate with the lower end of the contour positioning block (121); wherein When the locking nut (122) locks the contoured positioning block (121) and the contoured base (11), the contoured positioning block (121) presses the lower part of the bracket against the inner wall of the lower contoured cavity (111).

4. The medical cage-type metal stent forming mold according to claim 2, characterized in that: The upper mold assembly (13) comprises a plurality of mold sheets (131) stacked in layers, and the inner side of the mold sheet (131) is provided with a profiling hole (132) for forming an upper profiling cavity (130); The mold sheet (131) is provided with a plurality of positioning holes (133) for the stretching components (2) to pass through.

5. The medical cage-type metal stent forming mold according to claim 2, characterized in that: The stretching assembly (2) comprises a plurality of U-shaped fixing wires (21) which are used to extend from the upper contour cavity (130) so as to stretch and fix the corresponding position on the bracket to the corresponding position on the inner wall of the upper contour cavity (130).

6. The medical cage-type metal stent forming mold according to claim 2, characterized in that: The profiling mold (1) further comprises: A positioning pin (14) is used to pass through the contoured base (11) and the upper die set (13); the upper and lower ends of the positioning pin (14) are both provided with a pin hole (141); The upper and lower latch pins (15, 16) are respectively used to be inserted into corresponding latch pin holes (141) to fix the positioning pin (14) to the contoured base (11) and the upper die set (13).

7. A method for forming a medical cage-type metal stent, characterized in that: include: Step 1: Insert the contoured positioning block (121) into the inner side of the lower part of the bracket to form an assembly; Step 2: insert the assembly completed in step 1 into the lower contour cavity (111) of the contour base (11), and tighten the locking nut (122) on the lower end of the contour positioning block (121); Step 3: Insert the positioning pin (14) into the pin hole on the contoured base (11), and insert the lower plug pin into the plug hole at the lower end of the positioning pin (14); Step 4: Installing the first layer of mold sheet (131) on the contoured base (11); Step 5: insert the U-shaped fixing wire (21) through the positioning hole (133) on the first layer of the mold sheet (131), fix the U-shaped fixing wire (21) and stretch the bracket connection node outward, so that the bracket fits the inner surface of the inner side contour hole (132) of the mold sheet (131), and tie the U-shaped fixing wire (21) to fix it; Step 6: Repeat the operation of step 5 to install the remaining mold pieces (131) and the U-shaped fixing wires (21) in sequence; Step 7: After all the mold pieces (131) are installed, insert the upper latch into the latch hole at the upper end of the positioning pin (14) to fix the entire mold.

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