CN111793746A - Valve support heat treatment tool - Google Patents
Valve support heat treatment tool Download PDFInfo
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- CN111793746A CN111793746A CN202010811226.5A CN202010811226A CN111793746A CN 111793746 A CN111793746 A CN 111793746A CN 202010811226 A CN202010811226 A CN 202010811226A CN 111793746 A CN111793746 A CN 111793746A
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- cylinder
- heat treatment
- cone
- ball
- column body
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/006—Resulting in heat recoverable alloys with a memory effect
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
The application provides a valve support thermal treatment frock, including bulb cone and cylinder, wherein: the first cylinder is provided with a hollow structure and a positioning hole; one end of the ball-end cone is connected with one end of the first column body, and the ball-end cone and the first column body are integrally formed; and an arc section is arranged at the position, connected with the ball cone, in the first column body. This application can improve the structural homogeneity of support.
Description
Technical Field
The application relates to the field of medical equipment, and more particularly relates to a valve stent heat treatment tool.
Background
With the aging population, the incidence of valvular heart disease is increasing, and transcatheter heart valve replacement surgery is being promoted. The mainstream heart valve stent is divided into a self-expanding type and a ball expanding type. The self-expandable valve stent is made of shape memory material nickel-titanium alloy. The nickel-titanium alloy pipe with the diameter of several millimeters is cut into a stent by laser, and the stent is subjected to heat treatment for multiple times, gradually expanded in radial dimension and shaped to be manufactured into a final valve stent. In the prior art, salt bath heat treatment is adopted, the bracket is fixed on a die for treatment, and the structural uniformity of the bracket obtained by heat treatment is lower.
Disclosure of Invention
The embodiment of the application provides a valve support heat treatment tool to solve the problem that the uniformity of a support structure obtained by heat treatment is low.
The embodiment of the application provides a valve support thermal treatment frock includes bulb cone and cylinder, wherein:
the first cylinder is provided with a hollow structure and a positioning hole;
one end of the ball-end cone is connected with one end of the first column body, and the ball-end cone and the first column body are integrally formed;
and an arc section is arranged at the position, connected with the ball cone, in the first column body.
Like this, in this application embodiment, through the structure of bulb cone with in the first cylinder with the circular arc section that the position that the bulb cone is connected set up, difficult impaired when the protective cradle installation with the expansion to through set up hollow structure in the cylinder, make the support heat with cool off faster in heat treatment process, the support guarantees the structural homogeneity of support through the locating hole in heat treatment process, thereby has reached the technological effect who improves supporting structure homogeneity.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a valve stent heat treatment tool provided in an embodiment of the present application;
FIG. 2 is a loading schematic view of a valve stent heat treatment tool provided by an embodiment of the present application;
FIG. 3 is a loading schematic view of another valve stent heat treatment tool provided by the embodiment of the application;
FIG. 4 is a schematic structural diagram of another heat treatment tool for a valve stent provided in an embodiment of the present application;
FIG. 5 is a schematic flow chart of a thermal processing method provided in an embodiment of the present application;
fig. 6 is a schematic flow chart of another thermal treatment method provided in the embodiments of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural view of a valve stent heat treatment tool provided in an embodiment of the present application, and as shown in fig. 1, the tool includes a ball-nose cone 100 and a first cylinder 200, wherein:
the first cylinder 200 is provided with a hollow structure and is provided with a positioning hole 201;
one end of the ball-nose cone 100 is connected with one end of the first column 200, and the ball-nose cone 100 and the first column 200 are integrally formed;
an arc section is arranged at the position, connected with the ball cone 100, in the first column body 200.
Wherein, above-mentioned valve support heat treatment frock can be high temperature resistant metal material, for example: die steel, stainless steel, and the like.
The ball of the ball-nose cone 100 can be matched with the size of the valve stent tubing to be processed, for example: after a pipe with the inner diameter of 5mm is cut into a stent by laser, the valve stent heat treatment tool needs to be used for expanding, and then the size of a ball head of the tool can be slightly smaller than 5mm or equal to 5 mm.
In this embodiment, the in-process of heat treatment frock is installed to the support, and the deformation that the support expansion produced is along the conical surface infinitely variable of bulb cone 100, in the first cylinder 200 with the position that bulb cone 100 is connected is provided with the circular arc section, and it is impaired to reduce the support in the manufacturing process, and in addition, the heating process, hollow structure through the cylinder can improve cold and hot transmission's efficiency, and the support guarantees the structural homogeneity of support through locating hole 201 in heat treatment, can realize improving the technological effect of supporting structure homogeneity.
Referring to fig. 2, fig. 2 is a loading schematic view of a valve stent heat treatment tool provided in an embodiment of the present application, and as shown in fig. 2, the valve stent heat treatment tool includes a ball-nose cone 100 and a first column 200, wherein:
the first cylinder 200 is provided with a hollow structure;
one end of the ball-nose cone 100 is connected with one end of the first column 200, and the ball-nose cone 100 and the first column 200 are integrally formed;
an arc section is arranged at the position, connected with the ball cone 100, in the first column body 200.
Optionally, the first cylinder 200 is provided with a positioning hole 201, wherein:
the positioning holes 201 are uniformly distributed along the circumference;
the number of the positioning holes 201 is greater than or equal to 3.
The positioning holes 201 may be uniformly distributed along any circumference of the column 200, for example: the 6 positioning holes on the surface of the first column body are trisected along the circumferential direction, and the 6 positioning holes can also be sextant along the circumferential direction. Preferably, the first column 200 is provided with 6 positioning holes, and the positioning holes are trisected along the circumferential direction, the size of the positioning hole 201 is 1mm, and the positions and the sizes of the positioning holes 201 are matched with the bracket cutting holes.
Optionally, fig. 3 is a loading schematic view of another valve stent heat treatment tool provided in an embodiment of the present application, and as shown in fig. 3, the first cylinder 200 is provided with a positioning pin 300, the positioning pin 300 is in clearance fit with the positioning hole 201, and the positioning pin 300 is in fit arrangement with the positioning hole 201.
The positioning pin 300 and the positioning hole 201 may be disposed in a matching manner, including the number, material, shape, and the like of the positioning pins, for example: the material for manufacturing the positioning pin 300 is the same as the material of the tool, and the position of the bracket on the tool can not deviate in the heat treatment process through the clearance fit between the positioning pin 300 and the positioning hole 201; by providing the positioning pin 300 in a cylindrical shape, fitting with the circular shape of the positioning hole 201, it is possible to facilitate the installation. In the installation process, after the support grids are uniformly adjusted according to the positions of the positioning holes 201, the positioning pins 300 are inserted, and then heat treatment can be carried out.
In this embodiment, the positioning holes 201 are uniformly formed in the first column body 200 along the circumference, the positioning pins 300 are installed to be in clearance fit with the positioning holes 201, the number, the material, the shape and the like of the positioning pins 300 are matched with the positioning holes 201, so that the installation is convenient, the position of the support in the heat treatment process is not deviated, and the technical effect of improving the uniformity of the support structure is achieved.
Optionally, the taper of the ball nose cone 100 is greater than or equal to 10 ° and less than or equal to 30 °.
The ball head is arranged at one end of the heat treatment tool, the taper is formed from small to large, the taper range is 10 degrees to 30 degrees, the taper of the ball head cone is preferably 15 degrees, the taper range can be an empirical value obtained in practice, the bracket is easy to damage if the expansion amplitude is too large during installation, and the radial size of the bracket is basically unchanged if the expansion amplitude is too small, so that a proper range is set for the taper. Through the ball head at one end of the tool and the taper of the ball cone 100, the bracket is sleeved on the column body after being gradually expanded along with the ball cone 100 in the installation process, the size is steplessly changed in the expansion process, and the bracket can be prevented from being damaged in the installation process.
In this embodiment, the size of the stent expanded during the installation process is steplessly changed by setting the taper of the ball-nose cone 100 within a range, preventing the stent from being damaged.
Referring to fig. 4, fig. 4 is a schematic structural view of another valve stent heat treatment tool provided in the embodiment of the present application, and as shown in fig. 4, the tool includes a ball-nose cone 100 and a first cylinder 200, wherein:
the first cylinder 200 is provided with a hollow structure;
one end of the ball-nose cone 100 is connected with one end of the first column 200, and the ball-nose cone 100 and the first column 200 are integrally formed;
an arc section is arranged at the position, connected with the ball cone 100, in the first column body 200.
Optionally, the first cylinder includes a second cylinder 202 and a third cylinder 203, one end of the second cylinder 202 is connected to one end of the ball cone 100, and the other end of the second cylinder 202 is connected to one end of the third cylinder 203, where:
the diameter of the second cylinder 202 is smaller than the diameter of the third cylinder 203;
an arc section is arranged at the position, connected with the ball cone 100, in the second cylinder 202;
an arc section 204 is arranged at the position of the second cylinder 202 connected with the third cylinder 203 or the position of the third cylinder 203 connected with the second cylinder 202.
The diameters of the second cylinder 202 and the third cylinder 203 can be preset according to the target size of the valve stent, for example: with the diameter of the second cylinder 202 set to 25mm and the diameter of the third cylinder 203 set to 32mm, the stent after heat treatment also has sections of different diameters.
Wherein, above-mentioned circular arc section 204 can set up according to the size of both ends cylinder, for example: as shown in fig. 4, the circular arc section 204 has two ends, namely a second cylinder 202 and a third cylinder 203, and then, in order to make the transition between the two cylinders smooth, the size of the circular arc section 204 can be set according to the sizes of the second cylinder 202 and the third cylinder 203.
In this embodiment, the diameter of the second cylinder 202 is different from that of the third cylinder 203, the heat treatment tool has different diameter sections, and the stent after heat treatment, that is, the stent includes different diameter sections, is not limited to a straight cylinder shape, and the circular arc section 204 is provided according to the position of the second cylinder 202 connected to the third cylinder 203 or the position of the third cylinder 203 connected to the second cylinder 202, so that the stent can be protected from being damaged.
Wherein, optionally, the frock still includes fourth cylinder 400, fourth cylinder 400 cover in the outside of first cylinder 200, wherein:
the fourth cylinder 400 is provided with a hollow structure, and the hollow structure is matched with the second cylinder 202 and the third cylinder 203;
after the fourth cylinder 400 is sleeved outside the first cylinder 200, the gap is larger than the wall thickness of the valve stent.
Wherein, the hollow structure can be matched with the second column 202 and the third column 203, for example: the diameter of the second column 202 is 25mm, the diameter of the third column 203 is 32mm, and then, in order to ensure that the size of the manufactured bracket is accurate, a hollow structure is arranged on the fourth column 400, namely, the hollow structure formed by digging out corresponding columns in the fourth column 400, in the process of mounting the bracket, the bracket is firstly sleeved on the first column 200, after the position of the bracket is adjusted, the fourth column 400 is sleeved outside the bracket for heat treatment, after the heat treatment and cooling are completed, the fourth column 400 is firstly dismounted, and then the bracket is taken down.
It should be noted that the first cylinder 200 may be a straight cylinder, or may be a combination of the second cylinder 202 and the third cylinder 203 having different diameter sections. The fourth cylinder 400 may be a cylinder, which is not limited herein. In the heat treatment process of the stent, the hollow structure of the fourth cylinder 400 is only required to be matched with the first cylinder 200 or the second cylinder 202 and the third cylinder 203, so that the expanded size of the stent is accurate and the shape of the stent is uniform. After the fourth cylinder 400 is sleeved outside the first cylinder 200, the gap larger than the wall thickness of the valve stent can ensure that a certain gap is left after the stent is sleeved on a tool, so that the installation of the stent and the tool can be facilitated.
In this embodiment, through being provided with two sections different diameters with the frock, can make into the support and contain two sections different diameters to through the cooperation of fourth cylinder 400 hollow structure, it is more accurate to have guaranteed the structure and the size of support, can realize improving the technological effect of support form homogeneity.
An embodiment of the present application further provides a heat treatment method, as shown in fig. 5, including:
Wherein the first temperature value and the first time value may be empirical values obtained in practice, such as: the salt bath heat treatment temperature is generally 450 to 530 ℃, the first temperature value for the heat treatment in the air circulation heat treatment furnace may be in the range of 500 to 530 ℃, and the first time value may be in the range of 5 to 10 minutes.
Wherein, the second time value can be in the range of 10 to 15 minutes, and the second time value is larger than the first time value.
And step 504, in the third heat treatment, mounting the support on the heat treatment tool, placing the support into an air circulation heat treatment furnace, setting the temperature value and the time value as a first temperature value and a third time value for heat treatment, and placing the support into ice water for rapid cooling after the heat treatment is finished.
Wherein the third time value may be in a range of 10 to 15 minutes, and the third time value is greater than the second time value.
And 505, performing fourth heat treatment, namely mounting the support on the heat treatment tool, putting the support into an air circulation heat treatment furnace, setting the temperature to be the first temperature and the fourth time value for heat treatment, and putting the support into ice water for rapid cooling after the heat treatment is finished.
Wherein the third time value may be in a range of 15 to 20 minutes, and the fourth time value is greater than the third time value.
Wherein, the heat treatment times are more than or equal to 3, the temperature parameters of each heat treatment are the same, the time parameters are increased progressively, and the cooling parameters are the same. The first heat treatment may expand the stent to about 2 times the inner diameter of the tubing, the second heat treatment may expand the stent to about 3 times the inner diameter of the tubing, the third heat treatment may expand the stent to about 4 times the inner diameter of the tubing, and the fourth heat treatment may expand the stent to about 5 to 6 times the inner diameter of the tubing.
In the embodiment, the heat treatment with the time parameter increasing and the temperature and cooling parameter being the same is carried out for a plurality of times in the air circulation heat treatment furnace, so that the radial size of the stent is gradually expanded, the key performances of the manufactured stent, such as superelasticity, radial supporting force, structural uniformity, fatigue property and the like, are better, and the pollution caused by salt bath heat treatment is avoided.
The embodiment of the present application also provides another heat treatment method, including:
Wherein, the second temperature value may be in a range of 460 to 480 ℃, and the fifth time value may be 15 minutes.
Wherein the third temperature value may be in a range of 480 to 500 ℃.
Wherein the fourth temperature value may be in a range of 500 to 520 ℃.
And 605, performing fourth heat treatment, namely installing the support on the heat treatment tool, putting the support into an air circulation heat treatment furnace, setting a fifth temperature value and a fifth time value for heat treatment, and putting the support into ice water for rapid cooling after the heat treatment is finished.
Wherein, the fifth temperature value can be in the range of 520 to 540 ℃.
The times of the heat treatment are more than or equal to three times, the temperature parameter of each heat treatment is increased progressively, the time parameter is the same, and the cooling parameter is the same. The first heat treatment may expand the stent to about 2 times the inner diameter of the tubing, the second heat treatment may expand the stent to about 3 times the inner diameter of the tubing, the third heat treatment may expand the stent to about 4 times the inner diameter of the tubing, and the fourth heat treatment may expand the stent to about 5 to 6 times the inner diameter of the tubing.
In the embodiment, the heat treatment with gradually increased temperature parameters and the same time and cooling parameters is performed for a plurality of times in the air circulation heat treatment furnace, so that the radial size of the stent is gradually expanded, the key performances of the manufactured stent, such as superelasticity, radial supporting force, structural uniformity, fatigue property and the like, are better, and the pollution caused by salt bath heat treatment is avoided.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a valve support thermal treatment frock which characterized in that, includes bulb cone and first cylinder, wherein:
the first cylinder is provided with a hollow structure and a positioning hole;
one end of the ball-end cone is connected with one end of the first column body, and the ball-end cone and the first column body are integrally formed;
and an arc section is arranged at the position, connected with the ball cone, in the first column body.
2. The tooling of claim 1, wherein the first cylinder being provided with the locating hole comprises:
the positioning holes are uniformly distributed along the circumference;
the number of the positioning holes is more than or equal to 3.
3. The tooling of claim 2, wherein the first cylinder is provided with a positioning pin, the positioning pin is in clearance fit with the positioning hole, and the positioning pin is in fit arrangement with the positioning hole.
4. The tooling of claim 1, wherein the taper of the ball nose cone is greater than or equal to 10 ° and less than or equal to 30 °.
5. The tooling of claim 1, wherein the first cylinder comprises a second cylinder and a third cylinder, one end of the second cylinder is connected with one end of the ball nose cone, the other end of the second cylinder is connected with one end of the third cylinder, wherein:
the diameter of the second cylinder is smaller than that of the third cylinder;
an arc section is arranged at the position, connected with the ball head cone, in the second column body;
and an arc section is arranged at the position, connected with the third cylinder, in the second cylinder or at the position, connected with the second cylinder, in the third cylinder.
6. The tool of claim 5, further comprising a fourth cylinder sleeved outside the first cylinder, wherein:
the fourth column body is provided with a hollow structure, and the hollow structure is matched with the first column body;
and after the fourth cylinder is sleeved outside the first cylinder, the gap is larger than the wall thickness of the valve stent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010811226.5A CN111793746A (en) | 2020-08-13 | 2020-08-13 | Valve support heat treatment tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010811226.5A CN111793746A (en) | 2020-08-13 | 2020-08-13 | Valve support heat treatment tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111793746A true CN111793746A (en) | 2020-10-20 |
Family
ID=72834598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010811226.5A Pending CN111793746A (en) | 2020-08-13 | 2020-08-13 | Valve support heat treatment tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111793746A (en) |
-
2020
- 2020-08-13 CN CN202010811226.5A patent/CN111793746A/en active Pending
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