A heat treatment device for a vascular stent

Abstract

The present invention relates to the field of medical devices, and provides a blood vessel stent heat treatment device, including a base, a heating component, a transmission component and a clamping component, wherein the heating component is arranged on the base, and the heating component is provided with a heating chamber and an inlet and outlet connected to the heating chamber; the transmission component is installed on the base and is spaced apart from the heating component; the clamping component includes a fixed tube and two clamping pieces, the fixed tube is arranged at the output end of the transmission component, the transmission component drives the fixed tube to pass through the inlet and outlet, so that the fixed tube extends into the heating chamber or exits the heating chamber, the fixed tube is provided with a notch in the connecting tube in the circumference, and the two clamping pieces are spaced apart inside the fixed tube, and are used to fix the blood vessel stent. The clamping component can keep the blood vessel stent suspended during the heat treatment process, thereby improving the uniformity of heating and the stability of size and shape.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a heat treatment device for a vascular stent. Background Art

[0002] Vascular stents are implanted into the human body to improve the problem of vascular stenosis and increase blood flow, and are currently an important means of clinical treatment for vascular stenosis.

[0003] Commonly used metal vascular stent materials include nickel-titanium shape memory alloy and stainless steel. Both materials need to go through certain heat treatment methods in the process of making vascular stents to achieve the required performance and shape of the vascular stents. Currently, commonly used heat treatment devices in the medical device industry include muffle furnaces and tubular furnaces.

[0004] In the existing technical solutions, firstly, due to the small size and complex structure of the vascular stent, the shape and size of the vascular stent need to be precisely controlled during the heat treatment process, and the vascular stent needs to be moved during the heating, removal and quenching of the vascular stent, which is cumbersome and the vascular stent is easily deformed by external forces, resulting in the failure of thermal shaping of the vascular stent and waste of materials and resources. Secondly, in the process of using the above-mentioned heat treatment device to heat the vascular stent, due to the lack of corresponding clamping, the vascular stent is easy to stick to the furnace wall, resulting in uneven heating of the vascular stent, and the product performance cannot meet the requirements. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a vascular stent heat treatment device, which fixes the vascular stent by a clamping assembly to improve the heating uniformity and the stability of the size and shape of the vascular stent during the heat treatment process.

[0006] A vascular stent heat treatment device according to an embodiment of the present invention comprises:

[0007] Base;

[0008] A heating component, the heating component is arranged on the base, and the heating component is provided with a heating cavity and an inlet and outlet communicating with the heating cavity;

[0009] A transmission assembly, the transmission assembly is mounted on the base and spaced apart from the heating assembly;

[0010] A clamping assembly, the clamping assembly includes a fixed tube and two clamping members, the fixed tube is arranged at the output end of the transmission assembly, the transmission assembly drives the fixed tube to pass through the inlet and outlet, so that the fixed tube extends into the heating chamber or exits the heating chamber, the fixed tube is circumferentially provided with a notch in the connecting tube, and the two clamping members are spaced apart inside the fixed tube for fixing the vascular stent.

[0011] According to one embodiment of the present invention, the clamping assembly further comprises:

[0012] A threaded support rod, the threaded support rod is arranged at one end of the fixed tube adjacent to the heating assembly, the threaded support rod passes through the fixed tube and is connected to one of the clamping members;

[0013] A threaded adjustment rod, one end of which is connected to the transmission assembly, and the other end of which passes through the fixed tube and is connected to another clamping member.

[0014] According to one embodiment of the present invention, the fixing tube comprises:

[0015] A tube body, wherein the tube body is provided with the notch in a circumferential direction;

[0016] Two plugs are respectively arranged at two ends of the tube body, each of the plugs is provided with a first through hole, and the threaded support rod and the threaded adjustment rod are both passed through the first through hole and connected with the clamping member.

[0017] According to one embodiment of the present invention, the clamping assembly also includes a first blocking block, which is arranged on the plug away from the heating assembly, and the threaded adjustment rod passes through the first blocking block. When both of the plugs extend into the heating chamber, the first blocking block blocks the inlet and outlet, and a second through hole is opened on the first blocking block for connecting to the heating chamber.

[0018] According to one embodiment of the present invention, the heating component comprises:

[0019] Two support frames, the two support frames are spaced apart from each other on the base, and at least one of the support frames is provided with the inlet and outlet;

[0020] A quartz tube, the quartz tube is mounted on the two support frames, one end of the quartz tube is connected to the inlet and outlet, and the heating chamber is arranged in the quartz tube;

[0021] A heating coil, which is disposed in the heating chamber and is in contact with the inner wall of the quartz tube;

[0022] An insulating tube is provided in the heating coil along the extension direction of the heating coil and is fitted with the inner wall of the heating coil.

[0023] According to one embodiment of the present invention, the heating assembly further comprises a second blocking block, which blocks an end of the quartz tube away from the inlet and outlet, and is provided with a thermocouple access hole, a protective gas inlet hole and a cable access hole connected to the heating chamber.

[0024] According to one embodiment of the present invention, a blind hole is formed on a side of the second blocking block facing the inlet and outlet, and when the clamping assembly enters the heating chamber, the threaded support rod is passed through the blind hole to fix the clamping assembly.

[0025] According to one embodiment of the present invention, the base is provided with two adjustment holes extending in parallel, one side of each support frame is connected to the base through one adjustment hole, and the other side is connected to the base through another adjustment hole, and each support frame is suitable for moving or locking relative to the base in the extension direction of the adjustment hole to adjust the distance between the two support frames.

[0026] According to one embodiment of the present invention, the transmission assembly comprises:

[0027] A support member, the support member being arranged on the base;

[0028] A handle assembly, wherein the handle assembly is disposed on the support member;

[0029] A rack and pinion assembly is disposed on the support member, and is respectively connected to the handle assembly and the clamping assembly so as to drive the rack and pinion assembly to move through the handle assembly to drive the clamping assembly to extend into or withdraw from the heating chamber.

[0030] According to one embodiment of the present invention, the rack and pinion assembly comprises:

[0031] A guide rail, the guide rail being arranged on the support member;

[0032] A rack, the rack being arranged on the guide rail and being movable along the guide rail, one end of the clamping assembly being connected to the rack so as to move along with the rack;

[0033] A gear is connected to the handle assembly and meshes with the rack. The handle assembly drives the gear to rotate so as to move the rack.

[0034] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0035] An embodiment of the present invention provides a vascular stent heat treatment device, including a base, a heating component, a transmission component and a clamping component. The heating component is fixed on the base, and a heating chamber is provided in the heating component, which is suitable for heat treatment of the vascular stent. At the same time, the clamping component fixes the vascular stent through a fixed tube and two clamping members. A notch in the connecting tube is opened in the circumference of the fixed tube, and the vascular stent to be treated can be installed in the fixed tube through the notch, and the vascular stent is fixed by two clamping members to ensure that the vascular stent is fixed in the fixed tube. In addition, the transmission component drives the clamping component to enter and exit the heating chamber. In this way, the vascular stent is fixed by the two clamping members, so that the vascular stent remains suspended during the heating, removal and quenching operations, thereby improving the uniformity of heating of the product, reducing the interference of external forces on the vascular stent, and improving the stability of the size and shape of the vascular stent.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. 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 creative work.

[0038] Figure 1 It is a schematic structural diagram of a clamping assembly of a vascular stent heat treatment device provided by an embodiment of the present invention being outside a heating chamber;

[0039] Figure 2 It is a structural schematic diagram of a clamping assembly of a vascular stent heat treatment device provided by an embodiment of the present invention being in a heating chamber;

[0040] Figure 3 It is a partial structural schematic diagram of a clamping assembly of a vascular stent heat treatment device provided by an embodiment of the present invention being located in a heating chamber;

[0041] Figure 4 is a structural schematic diagram of a base and a support frame provided in an embodiment of the present invention;

[0042] Figure 5 is a perspective structural schematic diagram of a heating assembly provided in an embodiment of the present invention;

[0043] Figure 6 is a schematic diagram of the assembly of a clamping assembly provided by an embodiment of the present invention;

[0044] Figure 7is an exploded schematic diagram of a transmission assembly provided by an embodiment of the present invention;

[0045] Figure 8 is a structural schematic diagram of a second blocking block provided by an embodiment of the present invention;

[0046] Fig. 9 is a structural schematic diagram of a first blocking block provided in an embodiment of the present invention;

[0047] Fig.10 It is a schematic diagram of the structure of a fixed pipe provided in an embodiment of the present invention.

[0048] Reference numerals:

[0049] 1. Base; 12. Support frame; 13. Adjustment hole; 2. Heating component; 22. Heating cable; 211. Quartz tube; 212. Heating coil; 213. Insulation tube; 23. Second blocking block; 231. Thermocouple access hole; 232. Cable access hole; 233. Blind hole; 24. Thermocouple; 234. Protective gas inlet hole; 25. Inlet and outlet;

[0050] 4. Clamping assembly; 41. Fixing tube; 42. Clamping member; 43. Threaded support rod; 44. Threaded adjustment rod; 411. Tube body; 412. Plug; 4111. Notch; 4121. First through hole; 45. First blocking block; 451. Second through hole; 461. Fastening nut; 462. Sealing gasket;

[0051] 5. Transmission assembly; 51. Gear rack assembly; 52. Support member; 53. Handle assembly; 511. Rack; 512. Guide rail; 513. Gear; 531. Turning handle; 532. Fixing pin; 533. Sleeve; 534. Bearing; 535. End cover. DETAILED DESCRIPTION

[0052] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0053] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "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 embodiments of 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 embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0054] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0055] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] An embodiment of one aspect of the present invention, in combination with Figure 1 , Figure 2 and Figure 3 As shown, a blood vessel stent heat treatment device is provided, comprising a base 1, a heating assembly 2, a transmission assembly 5 and a clamping assembly 4. The heating assembly 2 is arranged on the base 1, and the heating assembly 2 is provided with a heating chamber and an inlet and outlet 25 communicating with the heating chamber; the transmission assembly 5 is installed on the base 1 and is spaced apart from the heating assembly 2; the clamping assembly 4 comprises a fixed tube 41 and two clamping members 42, the fixed tube 41 is arranged at the output end of the transmission assembly 5, the transmission assembly 5 drives the fixed tube 41 to pass through the inlet and outlet 25, so that the fixed tube 41 extends into the heating chamber or exits the heating chamber, the fixed tube 41 is provided with a notch 4111 in the communicating tube in the circumferential direction, and the two clamping members 42 are spaced apart inside the fixed tube 41, and are used to fix the blood vessel stent.

[0058] It can be understood that the vascular stent heat treatment device also includes but is not limited to structures such as a heating cable 22, a thermocouple 24, a protective gas solenoid valve, and a control component, so that the heating component 2 heats the heating chamber, thereby heat-treating the vascular stent in the heating chamber. Exemplarily, the heating cable 22, the sensing line of the thermocouple 24, and the protective gas solenoid valve are connected to the control component, so that the control component can realize real-time detection and adjustment of the temperature in the heating chamber, as well as control the opening and closing of the protective gas. Optionally, the control component is a PLC control system.

[0059] The vascular stent heat treatment device provided by the embodiment of the present invention is fixed on the base 1 by the heating component 2. The heating component 2 is provided with a heating chamber suitable for heat treatment of the vascular stent. At the same time, the clamping component 4 fixes the vascular stent through the fixed tube 41 and two clamping members 42. A notch 4111 in the connecting tube is opened in the circumference of the fixed tube 41. The vascular stent to be treated can be installed in the fixed tube 41 through the notch 4111, and the vascular stent is fixed by the two clamping members 42 to ensure that the vascular stent is fixed in the fixed tube 41. In addition, the transmission component 5 drives the clamping component 4 to enter and exit the heating chamber. In this way, the vascular stent is fixed by the two clamping members 42, so that the vascular stent remains suspended during the heating, removal and quenching operations, thereby improving the uniformity of product heating, reducing the interference of external forces on the vascular stent, and improving the stability of the size and shape of the vascular stent.

[0060] It should be noted that there are many ways to fix the vascular stent to be processed in the fixed tube 41. In one embodiment, when the vascular stent does not have a heat-setting mold, the clamping pieces 42 at both ends of the fixed tube 41 clamp a metal wire, and the metal wire can be passed through the vascular stent. At this time, the vascular stent is supported by the metal wire and placed in the air, which can avoid the vascular stent from contacting the inner wall of the fixed tube 41, thereby ensuring that the vascular stent is heated evenly during the heat treatment process.

[0061] Optionally, when the blood vessel stent has a heat-setting mold, the heat-setting mold can be fixedly clamped between two clamping members 42. At this time, the blood vessel stent is fixed by the heat-setting mold and suspended in the fixing tube 41, so that the blood vessel stent is evenly heated all around.

[0062] In another embodiment, when salt bath heating is used, an intermediate medium (such as salt) with a heat transfer effect is filled into the fixing tube 41, and the vascular stent is fixed according to one of the two methods mentioned above or directly buried in the fixing tube 41 filled with the intermediate medium. The intermediate medium is heated in the heating chamber to achieve heat transfer, so that the vascular stent is heated more evenly under the heat transfer of the intermediate medium.

[0063] In an alternative embodiment, in combination Figure 6As shown, the clamping assembly 4 also includes a threaded support rod 43 and a threaded adjustment rod 44. The threaded support rod 43 is arranged at one end of the fixed tube 41 adjacent to the heating assembly 2, and the threaded support rod 43 passes through the fixed tube 41 and is connected to a clamping member 42; one end of the threaded adjustment rod 44 is connected to the transmission assembly 5, and the other end passes through the fixed tube 41 and is connected to another clamping member 42.

[0064] In this embodiment, two clamping members 42 of the same specification are installed at both ends of the interior of the fixed tube 41, and the clamping member 42 near the end of the heating assembly 2 is connected with a threaded support rod 43, and the threaded support rod 43 is used to connect and fix with the inner wall of the heating chamber to ensure the stability of the clamping member 4 in the heating chamber. The clamping member 42 at the end away from the heating assembly 2 is connected with a threaded adjustment rod 44, and optionally, the threaded adjustment rod 44 penetrates into the fixed tube 41 and is connected with the adjacent clamping member 42. It should be noted that the clamping member 42 connected with the threaded adjustment rod 44 can move along the fixed tube 41, so that the threaded adjustment rod 44 can push the clamping member 42 toward the other clamping member 42 to adjust the distance between the two clamping members 42, so that the length of the threaded adjustment rod 44 extending into the fixed tube 41 can be adjusted according to the actual size of the vascular stent, thereby adjusting the distance between the two clamping members 42, so as to achieve the clamping and fixing of vascular stents of different sizes, thereby improving the adaptability of the two clamping members 42 to vascular stents of different specifications.

[0065] In order to improve the corrosion resistance of the clamping assembly 4, the fixed tube 41, the threaded support rod 43 and the threaded adjustment rod 44 can be made of 316L stainless steel. 316L stainless steel has high corrosion resistance and can be used for a long time in a salt bath and water quenching atmosphere, thereby extending the service life of the parts.

[0066] Further, combined with Fig.10 As shown, the fixed tube 41 includes a tube body 411 and two plugs 412. The tube body 411 is provided with a notch 4111 in the circumferential direction; the two plugs 412 are respectively provided at the two ends of the tube body 411, each plug 412 is provided with a first through hole 4121, and the threaded support rod 43 and the threaded adjustment rod 44 are both passed through the first through hole 4121 and connected to the clamp 42. Optionally, the tube body 411 is an open round tube cut from a 316L stainless steel tube, which is convenient for the placement and removal of the vascular stent; the plugs 412 and the two ends of the tube body 411 are sealed and welded, and can be used in a heat treatment state in a salt bath atmosphere. Optionally, the first through holes 4121 of the two plugs 412 are kept on the same axis to ensure that the vascular stent is placed horizontally. It should be noted that the threaded support rod 43 passes through the first through hole 4121 of one plug 412, and the threaded adjustment rod 44 passes through the first through hole 4121 of the other plug 412, so that the threaded support rod 43 and the threaded adjustment rod 44 are in the same straight line to ensure that the vascular stent is placed horizontally.

[0067] It is understandable that the transverse length of the opening of the tube body 411 should be smaller than the diameter of the tube body 411. It should be noted that the transverse length of the opening of the tube body 411 is the length perpendicular to the axial direction of the tube body 411. The notch 4111 is arranged upward to facilitate the cooling water filled in the tube body 411 to cover the stent without flowing out from the notch 4111 during the quenching operation of the stent; or the intermediate medium can cover the stent during the salt bath heating operation of the stent.

[0068] In an alternative embodiment, in combination Figure 6 As shown, a fastening nut 461 and a sealing gasket 462 are installed between the clamp 42 and the fixed tube 41. The sealing gasket 462 is tightly attached to the inner end surface of the plug 412 of the fixed tube 41 by the fastening nut 461 to achieve sealing and prevent leakage. The sealing gasket 462 can be a high temperature resistant graphite gasket or other gaskets.

[0069] Optionally, in order to reduce heat loss during heating, combine Figure 3 , Figure 6 and Fig. 9 As shown, the clamping assembly 4 also includes a first blocking block 45, which is arranged on the plug 412 away from the heating assembly 2, and the threaded adjustment rod 44 passes through the first blocking block 45. When both plugs 412 extend into the heating chamber, the first blocking block 45 blocks the inlet and outlet 25, and the first blocking block 45 is provided with a second through hole 451 for connecting the heating chamber. It can be understood that the first blocking block 45 can be a ceramic heat-insulating blocking block, and the threaded adjustment rod 44 passes through the ceramic heat-insulating blocking block, and the ceramic heat-insulating blocking block is fixed and connected to the fixed tube 41 by the fastening nut 461. Specifically, the second through hole 451 can be used as a protective gas outlet hole. When the protective gas is not needed, the protective gas outlet hole can be blocked using relevant tools to reduce heat loss and energy waste.

[0070] In an alternative embodiment, in combination Figure 4 and Figure 5 As shown, the heating component 2 includes two support frames 12, a quartz tube 211, a heating coil 212 and an insulating tube 213. The two support frames 12 are spaced apart from each other on the base 1, and at least one support frame 12 is provided with an inlet and outlet 25; the quartz tube 211 is mounted on the two support frames 12, one end of the quartz tube 211 is connected to the inlet and outlet 25, and a heating cavity is provided in the quartz tube 211; the heating coil 212 is provided in the heating cavity and is fitted with the inner wall of the quartz tube 211; the insulating tube 213 is passed through the heating coil 212 along the extension direction of the heating coil 212 and is fitted with the inner wall of the heating coil 212.

[0071] In this embodiment, the base 1 and the support frame 12 can be made of Q235 steel or other materials, which is not specifically limited in this application. A stepped hole can also be provided in the middle of the support frame 12, so that the stepped hole can not only form an inlet and outlet 25 for connecting the heating chamber of the quartz tube 211, but also be used to connect the first blocking block 45. Both ends of the quartz tube 211 are provided with connecting parts (not marked in the figure), and each connecting part is connected to a support frame 12, so as to facilitate the fixing of the quartz tube 211. Exemplarily, a plurality of through holes (not marked in the figure) are provided around the stepped hole of the support frame 12, which are matched with bolts, nuts and gaskets to connect with the connecting part of the quartz tube 211.

[0072] In one embodiment, in combination Figure 4 , a trapezoidal boss (not marked in the figure) is provided on the base 1, a groove (not marked in the figure) matching the trapezoidal boss is provided below the support frame 12, and two adjustment holes 13 extending in parallel are provided on the base 1, and side ears with through holes are provided on both sides of each support frame 12 corresponding to the adjustment holes 13, and the through holes on the side ears are adapted to the adjustment holes 13. In this way, the through holes and the adjustment holes 13 can be passed through the matching bolts to fix the support frame 12 and the base 1 through nuts and gaskets, so that the connection between the base 1 and the support frame 12 is stable. Optionally, the support frame 12 and the base 1 can also be connected by other connecting parts such as screws and pins, which are not limited here. It should be noted that the adjustment hole 13 is a long strip hole, and the extension directions of the two adjustment holes 13 are parallel to each other. In this way, each support frame 12 is suitable for moving or locking relative to the base 1 in the extension direction of the adjustment hole 13 to adjust the distance between the two support frames 12. In this way, the distance between the two support frames 12 can be adjusted to adapt to quartz tubes 211 of different lengths, thereby facilitating the installation and fixation of the quartz tubes 211 .

[0073] For example, Figure 5 In the embodiment, the heating coil 212 is arranged in the heating chamber and connected to the heating cable 22, so that the heating coil 212 is powered by the heating cable 22 to achieve the heating effect. It should be noted that the insulating tube 213 can be a zirconia ceramic tube, and the insulating tube 213 is passed through the heating coil 212 and is close to the inner wall of the heating coil 212. At the same time, the zirconia ceramic tube and the heating coil 212 are effectively fixed by high-temperature resistant ceramic glue. It can be understood that after the heating coil 212 and the insulating tube 213 are assembled, they are passed through the heating chamber. At this time, the heating coil 212 can be close to the inner wall of the quartz tube 211. The heating coil 212 can be bonded to the inner wall of the quartz tube 211 using high-temperature resistant ceramic glue, thereby effectively fixing the heating coil 212 and preventing the pitch of the heating coil 212 from changing.

[0074] In one embodiment, the heating assembly 2 also includes a second blocking block 23, which blocks the end of the quartz tube 211 away from the inlet and outlet 25. The second blocking block 23 is provided with a thermocouple access hole 231 connected to the heating chamber, a protective gas inlet hole 234 and a cable access hole 232.

[0075] It can be understood that the second blocking block 23 blocks the end of the quartz tube 211 away from the inlet and outlet 25 to reduce heat leakage. One end of the thermocouple 24 can extend into the heating chamber through the thermocouple access hole 231. At the same time, the external air inlet nozzle can be set corresponding to the protective gas inlet hole 234, so that the protective gas is transported into the heating chamber through the protective gas inlet hole 234, and the protective gas can be discharged from the protective gas outlet hole (unmarked) to prevent the air pressure in the heating chamber from being too high. In addition, the heating cable 22 can be connected through the cable access hole 232, which is convenient for the heating cable 22 to be connected to the components in the heating chamber. Optionally, the thermocouple 24 is inserted into the thermocouple access hole 231 of the second blocking block 23, and the measuring end of the thermocouple 24 is extended into the heating chamber to realize real-time monitoring of the temperature. Optionally, the second blocking block 23 and the ceramic thermal insulation gasket are made of nanoporous ceramic thermal insulation material, but are not limited to nanoporous ceramic thermal insulation material. Optionally, the air inlet nozzle is made of stainless steel, one end of which is inserted into the protective gas inlet hole 234 of the second blocking block 23, and the other end is connected to the protective gas cylinder through a high-pressure gas pipe, and the high-pressure gas pipe is connected to a solenoid valve that controls the opening and closing of the protective gas.

[0076] Optional, combined Figure 4 and Figure 5 As shown, the quartz tube 211 is a double-layer vacuum quartz tube to ensure good thermal insulation performance, and the quartz tube 211 has flange joints (not marked in the figure) at both ends, and the flange joints are connected to the support frame 12 by bolts, nuts and ceramic insulation gaskets. The inner diameter of the quartz tube 211 should be larger than the outer diameter of the fixed tube 41 to ensure that the clamping assembly 4 will not scratch the inner wall of the quartz tube 211 during the operation of pushing in and pulling out of the heating chamber. The heating coil 212 can be made of tungsten wire of suitable size, wound into a spiral shape, and the diameter of the heating coil 212 is slightly larger than the inner diameter of the quartz tube 211, so that the heating coil 212 can be close to the inner wall of the quartz tube 211.

[0077] In an optional embodiment, the heating cable 22, the sensing line of the thermocouple 24, and the protective gas solenoid valve are all connected to the PLC control system to achieve real-time detection of the temperature in the heating chamber and adjustment of the temperature, heating rate, insulation time, and cooling rate in the heating chamber, as well as control of the opening and closing of the protective gas.

[0078] Optional, combined Figure 3 and Figure 8As shown, in order to better fix the clamping assembly 4, a blind hole 233 is further opened on the side of the second blocking block 23 facing the inlet and outlet 25. When the clamping assembly 4 enters the quartz tube 211, the threaded support rod 43 passes through the blind hole 233 to fix the clamping assembly 4.

[0079] In an alternative embodiment, in combination Figure 1 and Figure 7 As shown, the transmission assembly 5 includes a gear rack assembly 51, a support member 52 and a handle assembly 53, the support member 52 is arranged on the base 1; the handle assembly 53 is arranged on the support member 52; the gear rack assembly 51 is arranged on the support member 52, and the gear rack assembly 51 is respectively connected to the handle assembly 53 and the clamping assembly 4, so as to drive the gear rack assembly 51 to move through the handle assembly 53, so as to drive the clamping assembly 4 to extend into or withdraw from the heating chamber.

[0080] Optional, reference Figure 7 , the rack and pinion assembly 51 includes a guide rail 512, a rack 511 and a gear 513. The guide rail 512 is provided on the support member 52; the rack 511 is provided on the guide rail 512 and can move along the guide rail 512. One end of the clamping assembly 4 is connected to the rack 511 to follow the movement of the rack 511; the gear 513 is connected to the handle assembly 53 and meshes with the rack 511. The handle assembly 53 drives the gear 513 to rotate so that the rack 511 moves. Specifically, the tail end of the threaded adjustment rod 44 is connected to the rack 511 with a threaded hole. At this time, the movement of the rack 511 can drive the movement of the clamping assembly 4. By rotating the handle assembly 53, the gear 513 is driven to rotate, and the gear 513 rotates to drive the rack 511 to move forward and backward along the guide rail 512. It can be understood that the installation of the transmission assembly 5 needs to ensure that the threaded hole of the rack 511 is always kept on the same axis as the double-layer vacuum quartz tube 211 during the movement of the rack 511.

[0081] In one embodiment, a slide groove is provided on the side of the guide rail 512 facing away from the support member 52, and the slide groove is in the shape of a dovetail groove. The rack 511 is provided with a sliding protrusion corresponding to the slide groove, and the sliding protrusion can be slidably arranged in the slide groove so that the rack 511 can slide along the extension direction of the slide groove.

[0082] In one embodiment, the handle assembly 53 includes a rotating handle 531 , a fixing pin 532 , a sleeve 533 , a bearing 534 , and an end cover 535 .

[0083] During the heat treatment of the vascular stent, the vascular stent can be heated up along with the quartz tube 211 or the vascular stent can be sent into the quartz tube 211 after the quartz tube 211 reaches a preset temperature. When the vascular stent needs to be heated up along with the quartz tube 211, after the vascular stent is clamped and fixed, the clamping assembly 4 is sent into the quartz tube 211 as a whole by rotating the handle assembly 53, and the temperature in the heating chamber begins to rise. The temperature in the vascular stent and the quartz tube 211 rises to the set temperature for heat treatment. When the vascular stent needs to be sent into the quartz tube 211 after the quartz tube 211 reaches the preset temperature, the inlet and outlet 25 is first blocked with a suitable insulation block. After the temperature in the heating chamber reaches the preset temperature, the insulation block is removed, and the clamping assembly 4 is sent into the quartz tube 211 as a whole by rotating the handle assembly 53, and the vascular stent in the clamping assembly 4 is heat treated at the preset temperature.

[0084] It can be understood that by rotating the handle assembly 53, the clamping assembly 4 is sent into the quartz tube 211 as a whole. At this time, the vascular stent has been clamped and fixed, eliminating the influence of external force on its shape and size. When the clamping assembly 4 is sent into the quartz tube 211 as a whole, the tail end of the threaded support rod 43 is inserted into the blind hole 233 in the center of the second blocking block 23, and the first blocking block 45 can effectively block the inlet and outlet 25, thereby preventing heat from leaking from the inlet and outlet 25.

[0085] After the heating stage, the cooling process of the vascular stent can be divided into furnace cooling, air cooling (cooling in the air) and water (oil) quenching.

[0086] When the stent is cooled with the furnace, the clamping assembly 4 is in the heating chamber, and the stent is cooled to room temperature together with the quartz tube 211 at the cooling rate set by the PLC control system. After the temperature drops to room temperature, the handle assembly 53 is turned, and the clamping assembly 4 is pulled out of the heating chamber as a whole through the transmission assembly 5 to remove the stent product and complete the heat treatment process. The stent is cooled in a clamped and fixed state, eliminating the changes in size and shape caused by external interference.

[0087] When the stent is air-cooled, first turn off the current input of the heating coil 212, turn off the protective gas if necessary, and pull the clamping assembly 4 out of the quartz tube 211 as a whole by turning the handle 531, so that it is cooled in the air, and after the clamping assembly 4 is cooled to room temperature as a whole, remove the stent product to complete the heat treatment process. The stent is cooled in a clamped and fixed state, eliminating the changes in size and shape caused by external interference.

[0088] When the stent needs water (oil) quenching, first turn off the current input of the heating coil 212, turn off the protective gas if necessary, pull the clamping assembly 4 out of the heating chamber as a whole by turning the handle assembly 53, and quench the stent by injecting water (oil) into the clamping assembly 4. After the clamping assembly 4 is cooled to room temperature as a whole, use the corresponding tool to turn the threaded adjustment rod 44 to turn the clamping assembly 4 to the state where the notch 4111 faces downward, transfer the water (oil) in the fixed tube 41 to other containers, and then use the corresponding tool to turn the threaded adjustment rod 44 again to turn the clamping assembly 4 to the state where the notch 4111 faces upward, and remove the stent product to complete the heat treatment process. The stent is cooled in the clamped and fixed state, eliminating the changes in size and shape caused by external interference.

[0089] It should be noted that the above-mentioned sequence of the embodiments of the present application is for description only and does not represent the advantages and disadvantages of the embodiments. The above-mentioned specific embodiments of this specification are described. Other embodiments are within the scope of the attached claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0090] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of this application.

Claims

1. A vascular stent heat treatment device, characterized in that: include: Base; A heating component, the heating component is arranged on the base, and the heating component is provided with a heating cavity and an inlet and outlet communicating with the heating cavity; A transmission assembly, the transmission assembly is mounted on the base and spaced apart from the heating assembly; A clamping assembly, the clamping assembly includes a fixed tube and two clamping members, the fixed tube is arranged at the output end of the transmission assembly, the transmission assembly drives the fixed tube to pass through the inlet and outlet, so that the fixed tube extends into the heating chamber or exits the heating chamber, the fixed tube is circumferentially provided with a notch in the connecting tube, the notch is arranged upward, the two clamping members are arranged at intervals inside the fixed tube, and are used to fix the vascular stent so that the vascular stent is suspended in the air.

2. The vascular stent heat treatment device according to claim 1, characterized in that: The clamping assembly also includes: A threaded support rod, the threaded support rod is arranged at one end of the fixed tube adjacent to the heating assembly, the threaded support rod passes through the fixed tube and is connected to one of the clamping members; A threaded adjustment rod, one end of which is connected to the transmission assembly, and the other end of which passes through the fixed tube and is connected to another clamping member.

3. The vascular stent heat treatment device according to claim 2, characterized in that: The fixed tube comprises: A tube body, wherein the tube body is provided with the notch in a circumferential direction; Two plugs, the two plugs are respectively arranged at the two ends of the tube body, each of the plugs is provided with a first through hole, the threaded support rod and the threaded adjustment rod are both passed through the first through hole and connected to the clamping member.

4. The vascular stent heat treatment device according to claim 3, characterized in that: The clamping assembly also includes a first blocking block, which is arranged on the plug away from the heating assembly, and the threaded adjustment rod passes through the first blocking block. When both plugs extend into the heating chamber, the first blocking block blocks the inlet and outlet, and a second through hole is opened on the first blocking block for connecting the heating chamber with the outside world.

5. The vascular stent heat treatment device according to any one of claims 2 to 4, characterized in that: The heating assembly comprises: Two support frames, the two support frames are spaced apart from each other on the base, and at least one of the support frames is provided with the inlet and outlet; A quartz tube, the quartz tube is mounted on the two support frames, one end of the quartz tube is connected to the inlet and outlet, and the heating chamber is arranged in the quartz tube; A heating coil, which is disposed in the heating chamber and is in contact with the inner wall of the quartz tube; An insulating tube is provided in the heating coil along the extension direction of the heating coil and is fitted with the inner wall of the heating coil.

6. The vascular stent heat treatment device according to claim 5, characterized in that: The heating assembly also includes a second blocking block, which blocks an end of the quartz tube away from the inlet and outlet, and is provided with a thermocouple access hole, a protective gas inlet hole and a cable access hole connected to the heating chamber.

7. The vascular stent heat treatment device according to claim 6, characterized in that: A blind hole is formed on one side of the second blocking block facing the inlet and outlet. When the clamping assembly enters the heating chamber, the threaded support rod is passed through the blind hole to fix the clamping assembly.

8. The vascular stent heat treatment device according to claim 5, characterized in that: The base is provided with two adjustment holes extending in parallel. One side of each support frame is connected to the base through one adjustment hole, and the other side is connected to the base through another adjustment hole. Each support frame is suitable for moving or locking relative to the base in the extension direction of the adjustment hole to adjust the distance between the two support frames.

9. The vascular stent heat treatment device according to any one of claims 1 to 4, characterized in that: The transmission assembly comprises: A support member, the support member being arranged on the base; A handle assembly, wherein the handle assembly is disposed on the support member; A rack and pinion assembly is disposed on the support member, and is respectively connected to the handle assembly and the clamping assembly so as to drive the rack and pinion assembly to move through the handle assembly to drive the clamping assembly to extend into or withdraw from the heating chamber.

10. The vascular stent heat treatment device according to claim 9, characterized in that: The rack and pinion assembly comprises: A guide rail, the guide rail being arranged on the support member; A rack, the rack being arranged on the guide rail and being movable along the guide rail, one end of the clamping assembly being connected to the rack so as to move along with the rack; A gear is connected to the handle assembly and meshes with the rack. The handle assembly drives the gear to rotate so as to move the rack.

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