A heat setting mold for an umbrella-shaped vena cava filter

Abstract

The present invention discloses an umbrella-shaped vena cava filter heat-setting mold, which relates to the field of mold technology. The mold comprises a base, a die, and a punch. The die is a frustum. The outer conical surface of the die is provided with a plurality of circumferentially evenly distributed rod shaping grooves extending from the small end to the large end of the die. The rod shaping grooves are layered in the axial direction according to their extension lengths, comprising three layers of rod shaping grooves. The inner conical surface of the punch is provided with protrusions that respectively cooperate with each rod shaping groove. The punch is provided with first barb pressing blocks corresponding to the end sections of each rod shaping groove in the second layer for forming the first barb on the spoke, and second barb pressing blocks corresponding to the end sections of each rod shaping groove in the third layer for forming the second barb on the spoke. The base is provided with first and second barb shaping grooves that respectively cooperate with each first and second barb pressing blocks to form the first and second barbs. The present invention enables cut tubing to be heat-set into a desired shape.

Description

Technical Field

[0001] The invention relates to the technical field of molds, in particular to a heat-setting mold for an umbrella-shaped vena cava filter. Background Art

[0002] Deep vein thrombosis (DVT) is a common vascular surgical condition. Its most serious complication is fatal pulmonary embolism (PE) caused by dislodged thrombi. Implanting a vena cava filter into the inferior vena cava can prevent PE. Filters are classified into two types based on how long they remain in place: permanent and retrievable.

[0003] Two prior art patent applications for recyclable umbrella-shaped vena cava filters are disclosed: CN110507447A (Vavenae Cava Filter and Recycling Device, published on November 29, 2019) and CN107374778A (Vavenae Cava Filter and Recycling Device, published on November 24, 2017). To address the issue of how to integrally mold the umbrella-shaped vena cava filters described in these patent applications, the present invention provides a heat-setting mold for the umbrella-shaped vena cava filter, enabling the cut tubing to be heat-set into the desired shape. Summary of the Invention

[0004] The purpose of the present invention is to provide an umbrella-shaped vena cava filter heat-setting mold to solve the problems existing in the above-mentioned prior art, so that the cut tube can be heat-set into the desired shape.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an umbrella-shaped vena cava filter heat-setting mold, comprising a base, a concave mold and a convex mold, wherein the concave mold is a frustum, and a plurality of rod body shaping grooves are provided on the outer conical surface of the concave mold, extending from the small end to the large end of the concave mold, and each of the rod body shaping grooves is evenly distributed along the circumference, and the rod body shaping grooves are layered and distributed in the axial direction according to the extension length, including three layers of the rod body shaping grooves, and each layer of the rod body shaping grooves is evenly distributed along the circumference, and the two layers with the shortest and longest extension lengths are respectively the first layer of rod body shaping grooves and the third layer of rod body shaping grooves, and the remaining layer is the second layer of rod body shaping grooves; the inner conical surface of the convex mold is provided with The protrusions respectively matched with each of the rod body molding grooves are used to press each spoke of the umbrella-shaped vena cava filter into each of the rod body molding grooves for molding. The punch is provided with a first barb pressing block corresponding to the end section of each of the rod body molding grooves of the second layer for molding the first barb on the spoke. The punch is also provided with a second barb pressing block corresponding to the end section of each of the rod body molding grooves of the third layer for molding the second barb on the spoke. The base is provided with a first barb molding groove and a second barb molding groove respectively matched with each of the first barb molding blocks and each of the second barb molding blocks to mold the first barb and the second barb.

[0007] Preferably, the first barb pressing block is an arc-shaped pressing block, and the first barb shaping groove is an arc-shaped shaping groove matching the arc-shaped pressing block.

[0008] Preferably, the second barb pressing block is a pressing block having an oblique plane, and the second barb shaping groove is a shaping groove having an oblique plane groove bottom matching the oblique plane.

[0009] Preferably, the large end of the die is provided with a slideway which is axially slidably connected with each of the first barb shaping grooves.

[0010] Preferably, the base and the die are locked by radially arranged pins.

[0011] Preferably, the width of the end section of each rod shaping groove of the second layer corresponding to the first barb is greater than the width of the starting section.

[0012] Preferably, the width of the end section of each rod shaping groove in the third layer corresponding to the second barb is greater than the width of the starting section.

[0013] Preferably, each of the rod shaping grooves in the first layer is a three-fold line shaping groove.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] The present invention provides an umbrella-shaped vena cava filter heat-setting mold. Through the cooperative arrangement of a concave mold and a convex mold, the spokes on the cut pipe can be pressed tightly into each rod body shaping groove for subsequent heat setting. Under the cooperative action of the first barb shaping groove and the first barb pressing block, the first barb in the spoke can be formed and pressed tightly into the first barb shaping groove for subsequent heat setting. Under the cooperative action of the second barb shaping groove and the second barb pressing block, the second barb in the spoke can be formed and pressed tightly into the second barb shaping groove for subsequent heat setting. By using the umbrella-shaped vena cava filter heat-setting mold of the present invention, the spokes of the umbrella-shaped vena cava filter are formed and bound, the shape of the corresponding rod body shaping groove is copied, and then heating is performed to achieve the heat setting purpose of the umbrella-shaped vena cava filter and obtain the desired shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 Schematic diagram of the three-dimensional structure of the umbrella-shaped vena cava filter;

[0018] Figure 2 A schematic diagram of the three-dimensional structure of the heat-setting mold for the umbrella-shaped vena cava filter provided by the present invention;

[0019] Figure 3 This is a schematic diagram of the main structure of the umbrella-shaped vena cava filter heat-setting mold provided by the present invention;

[0020] Figure 4 An exploded view of the heat-setting mold for the umbrella-shaped vena cava filter provided by the present invention;

[0021] Figure 5 Schematic diagram of the internal structure of the punch in the present invention;

[0022] Figure 6 This is a schematic cross-sectional view of the heat-setting mold for the umbrella-shaped vena cava filter provided by the present invention when the umbrella-shaped vena cava filter is formed;

[0023] Figure 7 for Figure 6 Schematic diagram of the enlarged structure of part I;

[0024] Figure 8 for Figure 6 Schematic diagram of the enlarged structure of part II;

[0025] In the figure: 1-base, 2-die, 3-punch, 4-first layer rod body shaping groove, 5-third layer rod body shaping groove, 6-second layer rod body shaping groove, 7-bump, 8-umbrella-shaped vena cava filter, 9-spoke rod, 10-first barb, 11-first barb pressure block, 12-second barb, 13-second barb pressure block, 14-first barb shaping groove, 15-second barb shaping groove, 16-slide, 17-latch. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide an umbrella-shaped vena cava filter heat-setting die to solve the problems existing in the prior art, so that the cut tube can be heat-set into a desired shape.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1-8As shown, this embodiment provides an umbrella-shaped vena cava filter heat-setting mold, including a base 1, a die 2 and a punch 3. The die 2 is a frustum. A plurality of rod body shaping grooves are provided on the outer conical surface of the die 2, extending from the small end to the large end of the die 2. The rod body shaping grooves are evenly distributed along the circumference. The rod body shaping grooves are layered and distributed in the axial direction according to the extension length, including three layers of rod body shaping grooves. The rod body shaping grooves in each layer are evenly distributed along the circumference. The two layers with the shortest and longest extension lengths are the first layer of rod body shaping grooves 4 and the third layer of rod body shaping grooves 5, and the remaining layer is the second layer of rod body shaping grooves 6; the inner conical surface of the punch 3 is provided with rod body shaping grooves that are respectively connected to the rod body. The protrusion 7 that cooperates with the shaping groove is used to press the spokes 9 of the umbrella-shaped vena cava filter 8 into the shaping grooves of the rod body for shaping. The punch 3 is provided with a first barb pressing block 11 corresponding to the end section of the shaping groove of each rod body of the second layer for forming the first barb 10 on the spoke 9. The punch 3 is also provided with a second barb pressing block 13 corresponding to the end section of the shaping groove of each rod body of the third layer for forming the second barb 12 on the spoke 9; the base 1 is provided with a first barb shaping groove 14 and a second barb shaping groove 15 that cooperate with each first barb pressing block 11 and each second barb pressing block 13 to form the first barb 10 and the second barb 12.

[0030] By cooperating with the concave die 2 and the convex die 3, the spokes 9 on the cut pipe can be pressed into each rod body molding groove for subsequent heat setting. Under the cooperation of the first barb molding groove 14 and the first barb pressing block 11, the first barb 10 in the spokes 9 can be formed and pressed into the first barb molding groove 14 for subsequent heat setting. Under the cooperation of the second barb molding groove 15 and the second barb pressing block 13, the second barb 12 in the spokes 9 can be formed and pressed into the second barb molding groove 15 for subsequent heat setting. By using the umbrella-shaped vena cava filter heat setting mold of the present invention, each spoke 9 of the umbrella-shaped vena cava filter is formed and bound, the shape of the corresponding rod body molding groove is copied, and then heating is performed to achieve the heat setting purpose of the umbrella-shaped vena cava filter and obtain the desired shape.

[0031] In this embodiment, the first barb pressing block 11 is an arc-shaped pressing block, and the first barb shaping groove 14 is an arc-shaped shaping groove that matches the arc-shaped pressing block. The curved hook can be formed by the cooperation between the arc-shaped pressing block and the arc-shaped shaping groove.

[0032] In this embodiment, the second barb pressing block 13 is a pressing block with an oblique plane, and the second barb shaping groove 15 is a shaping groove with an oblique plane groove bottom that matches the oblique plane. A straight hook can be formed by matching the oblique plane with the oblique plane groove bottom.

[0033] In this embodiment, the large end of the die 2 is provided with a slideway 16 that is axially slidably connected to each first barb forming groove 14. When forming the first barb 10, the first barb forming groove 14 is axially slid along the slideway 16 close to the first barb pressing block 11, and the first barb 10 is formed at the free end of the spoke 9. At the same time, the second barb forming groove 15 is axially close to the second barb pressing block 13, and the second barb 12 is formed at the free end of the spoke 9.

[0034] In this embodiment, the base 1 and the die 2 are locked by radially arranged pins 17 to avoid displacement between the two and ensure the accuracy of heat setting.

[0035] In this embodiment, the width of the end section of each rod body shaping groove of the second layer corresponding to the first barb 10 is greater than the width of the starting section, and the width of the end section of each rod body shaping groove of the second layer corresponds to the width of the free end of the corresponding spoke rod 9. When the first barb shaping groove 14 moves close to the first barb pressing block 11, the first barb shaping groove 14 can bend a portion of the spoke rod on one side of the free end of the spoke rod 9 and form it into the first barb 10 through interaction with the first barb pressing block 11, while leaving a portion of the spoke rod on the other side of the free end of the spoke rod 9 unchanged.

[0036] In this embodiment, the width of the end section of each rod body shaping groove of the third layer corresponding to the second barb 12 is greater than the width of the starting section, and the width of the end section of each rod body shaping groove of the third layer corresponds to the width of the free end of the corresponding spoke rod 9. When the second barb shaping groove 15 moves close to the second barb pressing block 13, the second barb shaping groove 15 can bend a portion of the spoke rod on one side of the free end of the spoke rod 9 and form it into the second barb 12 through interaction with the second barb pressing block 13, while leaving the portion of the spoke rod on the other side of the free end of the spoke rod 9 unchanged.

[0037] In this embodiment, each rod shaping groove of the first layer is a three-fold line shaping groove, so as to shape this part of the spoke rod into a three-fold line spoke rod.

[0038] The use process of the mold of the present invention is as follows: after the nickel-titanium tube is cut into several spokes with one end free along the axial direction of the tube wall, the spokes are first pressed into the respective rod body shaping grooves on the die 2, and then the punch 3 is fitted with the die 2, and the protrusions 7 in the punch 3 are used to press and restrain the spokes in the rod body shaping grooves, so that each spoke imitates the shape of the corresponding rod body shaping groove in the die 2, and then the first barb shaping groove 14 of the base 1 is matched with the slide 16, and the base 1 is pushed along the slide 16 direction, so that the first barb shaping groove 14 on the base 1 is against the free end of the corresponding spoke 9 and squeezed, until one side part of the free end of the spoke 9 is bent and shaped into a hook under the interaction of the first barb shaping groove 14 and the first barb pressing block 11, and at the same time, the second barb shaping groove 15 on the base 1 bends one side part of the free end of the corresponding spoke 9 into a straight hook. Finally, after the base 1 and the female mold 2 are locked by the latch 17 , the mold is heated to heat-set the shape of the umbrella-shaped vena cava filter in the mold.

[0039] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A heat-setting mold for an umbrella-shaped vena cava filter, characterized by: It includes a base, a die and a punch, the die is a frustum, and a plurality of rod shaping grooves are provided on the outer conical surface of the die, extending from the small end to the large end of the die, and each of the rod shaping grooves is evenly distributed along the circumference, and the rod shaping grooves are layered and distributed in the axial direction according to the extension length, including three layers of the rod shaping grooves, and each layer of the rod shaping grooves is evenly distributed circumferentially, and the two layers with the shortest and longest extension lengths are respectively the first layer of rod shaping grooves and the third layer of rod shaping grooves, and the remaining layer is the second layer of rod shaping grooves; the inner conical surface of the punch is provided with grooves that are respectively connected to the rod shaping grooves The protrusions that match the grooves are used to press the spokes of the umbrella-shaped vena cava filter into the rod body molding grooves for molding. The punch is provided with a first barb pressing block corresponding to the end section of each rod body molding groove of the second layer for molding the first barb on the spoke. The punch is also provided with a second barb pressing block corresponding to the end section of each rod body molding groove of the third layer for molding the second barb on the spoke. The base is provided with a first barb molding groove and a second barb molding groove that respectively cooperate with each first barb molding block and each second barb molding block to mold the first barb and the second barb.

2. The umbrella-shaped vena cava filter heat-setting mold according to claim 1, characterized in that: The first barb pressing block is an arc-shaped pressing block, and the first barb shaping groove is an arc-shaped shaping groove matched with the arc-shaped pressing block.

3. The umbrella-shaped vena cava filter heat-setting mold according to claim 1, characterized in that: The second barb pressing block is a pressing block having an oblique plane, and the second barb shaping groove is a shaping groove having an oblique plane groove bottom matching the oblique plane.

4. The umbrella-shaped vena cava filter heat-setting mold according to claim 1, characterized in that: The large end of the female die is provided with a slideway which is axially slidably connected with each of the first barb shaping grooves.

5. The umbrella-shaped vena cava filter heat-setting mold according to claim 1, characterized in that: The base and the die are locked by radially arranged latches.

6. The umbrella-shaped vena cava filter heat-setting mold according to claim 1, characterized in that: The width of the end section of each rod shaping groove in the second layer corresponding to the first barb is greater than the width of the starting section.

7. The umbrella-shaped vena cava filter heat-setting mold according to claim 1, characterized in that: The width of the end section of each rod body shaping groove in the third layer corresponding to the second barb is greater than the width of the starting section.

8. The umbrella-shaped vena cava filter heat-setting mold according to claim 1, characterized in that: Each of the rod shaping grooves in the first layer is a three-fold line shaping groove.

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