Stent film covering tool

Abstract

The utility model aims to provide a stent film covering tool which is firm in bonding of an inner film and an outer film and convenient to operate, and comprises a support, a core rod and a heat insulation sleeve are arranged on the support, the heat insulation sleeve can move close to or away from the core rod, and the tool further comprises a heating unit arranged on the periphery of the core rod. The core rod is used for supporting the support inside to enable the support to be in an expansion state, the inner film and the outer film are arranged in the state in a covering mode, the flatness of the double-layer film is guaranteed, the heat insulation sleeve sleeves the outer film in a non-welding area, heat of the heating unit is isolated, the outer film is prevented from being heated and deformed, and the film covering quality is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of medical device manufacturing technology, specifically to a stent covering tool. Background Technology

[0002] In interventional foldable blood pumps, both the inner and outer sides of the expandable stent at the pump body end need to be covered with membranes. The inner membrane is used to reduce hemolysis, while the outer membrane is used to provide blood flow channels. Because the afterload pressure is high and the blood flow rate is fast after the blood pump is running, a special covering tool needs to be designed to ensure a firm adhesion between the inner and outer membranes. Utility Model Content

[0003] The purpose of this invention is to provide a bracket coating fixture that provides a strong bond between the inner and outer membranes and is easy to operate.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a support for coating, including a support, on which a core rod and a heat insulation sleeve are provided. The heat insulation sleeve can move towards or away from the core rod. The tooling also includes a heating unit disposed on the outer periphery of the core rod.

[0005] Furthermore, the core rod includes an inner support member with a central hole in the middle. A shaft passes through the central hole and is fixedly connected to the inner support member. One end of the shaft is flush with the end of the inner support member, and the other end extends outward and is fixed to the first side plate of the support. The end of the inner support member away from the first side plate is suspended.

[0006] Furthermore, the inner support is spindle-shaped, including a central cylindrical section and frustum sections at both ends of the cylindrical section, with the diameter of the frustum sections gradually decreasing in the direction away from the cylindrical section.

[0007] Furthermore, a through hole is provided on the second side plate of the support, and the first and second side plates are arranged parallel and spaced apart. The heat insulation sleeve moves along the through hole to approach or move away from the core rod.

[0008] Furthermore, the mandrel and the heat insulation sleeve are arranged coaxially, with the inner diameter of the heat insulation sleeve being smaller than the diameter of the cylindrical section on the mandrel and larger than the minimum outer diameter of the frustum section.

[0009] Furthermore, the heating unit includes a heating coil, which is coaxially arranged with the inner support member. The axial length of the heating coil is greater than or equal to the length of the cylindrical section and has an axial gap with the end of the heat insulation sleeve.

[0010] Furthermore, a temperature probe and a temperature controller are installed inside the heating coil.

[0011] In the above scheme, the mandrel is used to support the bracket inside and keep it in an expanded state. In this state, the inner and outer membranes are covered to ensure the flatness of the double membrane. The heat insulation sleeve covers the outer membrane in the non-welding area to isolate the heat of the heating unit, prevent the outer membrane from deforming due to heat, and ensure the quality of the coating. Attached Figure Description

[0012] Figure 1 A schematic diagram showing the usage status of the laminating fixture;

[0013] Figure 2 for Figure 1 A schematic diagram of the structure after removing the heating unit;

[0014] Figure 3 A schematic diagram of the support and mandrel structure;

[0015] Figure 4 This is a schematic diagram of the mandrel and the heat insulation sleeve.

[0016] Figure 5 A 3D view of the support frame;

[0017] Figure 6 A schematic diagram of the structure after the inner membrane is applied to the stent;

[0018] Figure 7 A schematic diagram of the structure after the stent is covered with an inner and outer membrane.

[0019] In the figure, 10-support, 11-first side plate, 12-second side plate, 121-through hole, 20-core rod, 21-inner support, 22-shaft, 30-heat insulation sleeve, 40-heating unit, A-bracket, B-inner membrane, C-outer membrane. Detailed Implementation

[0020] The following is combined with Figures 1-7 This utility model will be discussed in further detail.

[0021] A stent lamination fixture includes a support 10, on which a mandrel 20 and a heat-insulating sleeve 30 are mounted. The heat-insulating sleeve 30 can move closer to or further away from the mandrel 20. The fixture also includes a heating unit 40 disposed around the mandrel 20. Since the stent A is an expandable / contractable structure, the mandrel 20 internally supports the stent A to maintain its expanded state, in which the inner membrane B and outer membrane C are laminationd, ensuring the flatness of the double membrane. The outer membrane C, in addition to being laminationd on the mandrel 20 at the position corresponding to the inner membrane B, also needs to extend proximally to the blood pump to form a blood flow channel. The heating unit 40 only needs to weld the overlapping area of ​​the inner membrane B and outer membrane C, and must also ensure that other areas of the outer membrane C do not deform. Therefore, the heat-insulating sleeve 30 is used to cover this part of the outer membrane C, insulating it from the heat of the heating unit 40, preventing the outer membrane C from deforming due to heat, and ensuring the quality of the lamination.

[0022] As a preferred embodiment of this utility model, such as Figure 4 As shown, the mandrel 20 includes an inner support member 21 with a central hole in its middle. A shaft 22 passes through the central hole and is fixedly connected to the inner support member 21. One end of the shaft 22 is flush with the end of the inner support member 21, and the other end extends outward and is fixed to the first side plate 11 of the support 10. Since the diameters at both ends of the support A are very small, the shaft 22 is matched with the diameters at both ends of the support A, and is therefore also very small. The inner support member 21 is required to be made of a surface-lubricated material to prevent damage to the inner film B when it is removed after coating. However, this material is difficult to process when machining the small-diameter shaft 22. Therefore, the inner support member 21 and the shaft 22 are processed independently and then assembled and fixed. This allows the shaft 22 to be made of a material other than the inner support member 21, reducing the processing difficulty and improving the rigidity of the shaft 22. The end of the inner support member 21 away from the first side plate 11 is suspended. The suspended structure, together with the movable heat insulation sleeve 30, provides sufficient space to facilitate the assembly and disassembly of other components such as bracket A.

[0023] The inner support member 21 is spindle-shaped, including a cylindrical section in the middle and frustum sections at both ends of the cylindrical section. The diameter of the frustum section gradually decreases in the direction away from the cylindrical section. The shape of the inner support member 21 matches the shape of the support A in the expanded state, so as to avoid the support A from being deformed by heat at high temperature.

[0024] To support the heat insulation sleeve 30, see [reference needed]. Figure 3 The second side plate 12 of the support 10 has a through hole 121. The first side plate 11 and the second side plate 12 are arranged in parallel and spaced apart. The heat insulation sleeve 30 moves along the through hole 121 to get closer to or away from the core rod 20. First, move the heat insulation sleeve 30 away from the mandrel 20 to create enough space to fit the inner membrane B, the support A, and the outer membrane C. Then, pass the outer membrane C through the inner cavity of the heat insulation sleeve 30. Move the heat insulation sleeve 30 closer to the mandrel 20 until the end of the heat insulation sleeve 30 abuts against the support A and the outer membrane C on the mandrel 30, making the heat insulation sleeve 30 and the mandrel 20 form a whole. On the one hand, the heat insulation sleeve 30 covers the extension of the outer membrane C, isolating some heat and preventing the high temperature of the heating coil from causing the outer membrane C outside the support A to deform due to heat. On the other hand, the heat insulation sleeve 30 and the mandrel 20 are connected, and the free end of the mandrel 20 is no longer suspended, enhancing the stability of the mandrel 20, that is, ensuring the stability of the mandrel 20 shaft. The heating coil heats the inner membrane B and the outer membrane C on it evenly. In the entire circumference, the double membrane is heated evenly, adheres firmly, and has high reliability.

[0025] Preferably, the mandrel 20 and the heat insulation sleeve 30 are arranged coaxially. Coaxial means that in the assembled state, the inner diameter of the heat insulation sleeve 30 is smaller than the diameter of the cylindrical section on the mandrel 20 and larger than the minimum outer diameter of the frustum section. In this way, when the heat insulation sleeve 30 abuts against the mandrel 20, the abutment position is on the frustum section, which will not affect the heating and welding of the inner membrane B and the outer membrane C on the cylindrical section.

[0026] like Figure 1 As shown, the heating unit 40 includes a heating coil. This indirect heating method can prevent damage to the membrane. The heating coil is coaxially arranged with the inner support member 21, so that the inner membrane B and outer membrane C on the outer periphery of the inner support member 21 are coaxial with the heating coil and are heated evenly in the entire circumferential direction. The axial length of the heating coil is greater than or equal to the length of the cylindrical section, ensuring that the inner membrane B and outer membrane C on the entire cylindrical section can be thermally melted and bonded together, especially at both ends, thereby ensuring the reliability of the double-layer membrane welding. In order to further reduce the heat transferred to the heat insulation sleeve 30, an axial gap is left between the heat insulation sleeve 30 and the end of the heat insulation sleeve 30, so that the two do not contact each other. The temperature of the heat insulation sleeve 30 is low, thereby playing a role in heat insulation protection for the outer membrane extension section in its inner cavity.

[0027] Furthermore, a temperature control probe and a temperature controller are installed inside the heating coil to precisely regulate the temperature of the heating coil and ensure the effectiveness of the double-layer film thermal fusion bonding.

[0028] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A bracket coating fixture, comprising a support (10), characterized in that: The support (10) is provided with a core rod (20) and a heat insulation sleeve (30). The heat insulation sleeve (30) can move closer to or further away from the core rod (20). The tooling also includes a heating unit (40) disposed on the outer periphery of the core rod (20).

2. The bracket coating fixture according to claim 1, characterized in that: The core rod (20) includes an inner support member (21). The inner support member (21) has a central hole in the middle. The shaft (22) passes through the central hole and is fixedly connected to the inner support member (21). One end of the shaft (22) is flush with the end of the inner support member (21), and the other end extends outward and is fixed to the first side plate (11) of the support (10). The end of the inner support member (21) away from the first side plate (11) is suspended.

3. The bracket coating fixture according to claim 2, characterized in that: The inner support (21) is spindle-shaped in general, including a cylindrical section in the middle and frustum sections at both ends of the cylindrical section. The diameter of the frustum section gradually decreases in the direction away from the cylindrical section.

4. The bracket coating fixture according to claim 2, characterized in that: The second side plate (12) of the support (10) has a through hole (121). The first side plate (11) and the second side plate (12) are arranged in parallel and spaced apart. The heat insulation sleeve (30) moves along the through hole (121) to get closer to or away from the core rod (20).

5. The bracket coating fixture according to claim 2, characterized in that: The mandrel (20) and the heat insulation sleeve (30) are arranged coaxially. The inner diameter of the heat insulation sleeve (30) is smaller than the diameter of the cylindrical section on the mandrel (20) and larger than the minimum outer diameter of the frustum section.

6. The bracket coating fixture according to claim 2, characterized in that: The heating unit (40) includes a heating coil, which is coaxially arranged with the inner support (21). The axial length of the heating coil is greater than or equal to the length of the cylindrical section and there is an axial gap between it and the end of the heat insulation sleeve (30).

7. The bracket coating fixture according to claim 6, characterized in that: The heating coil is equipped with a temperature probe and a temperature controller.

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