CN112255129A - External torsion loading device for intravascular stent - Google Patents
External torsion loading device for intravascular stent Download PDFInfo
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- CN112255129A CN112255129A CN202011138111.0A CN202011138111A CN112255129A CN 112255129 A CN112255129 A CN 112255129A CN 202011138111 A CN202011138111 A CN 202011138111A CN 112255129 A CN112255129 A CN 112255129A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0021—Torsional
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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Abstract
The invention discloses an external torsion loading device of a vascular stent, wherein a base is symmetrically provided with a left supporting frame and a right supporting frame, the inner side surface of the left supporting frame is provided with a fixing mechanism, and the inner side surface of the right supporting frame is provided with a torsion mechanism; the fixing mechanism comprises a fixing claw disc and a plurality of fixing claws, the fixing claws are circumferentially arranged on the fixing claw disc at intervals, and fixing clamping blocks are arranged at the end parts of the fixing claws; the torsion mechanism comprises a large gear, a power generation mechanism, a telescopic clamping rod and a reset mechanism, wherein a plurality of L-shaped fixed rods are fixed on the inner side surface of a wheel disc of the large gear at equal intervals on the periphery, the telescopic clamping rod is connected onto the fixed rods, the power generation mechanism is arranged at the bottom of the large gear, and the reset mechanism is arranged at the top of the large gear. The device has the advantages of simple structure, convenient operation, strong applicability and comprehensive and detailed test data, and can carry out in-vitro torsion loading test on vascular stents of different specifications under the action of the adjustable fixing mechanism and the torsion mechanism.
Description
Technical Field
The invention belongs to the technical field of intravascular stent testing, and particularly relates to an intravascular stent in-vitro torsion loading device.
Background
The intravascular stent is an external structure which is used for placing an internal stent in a lesion section on the basis of the expansion forming of a lumen balloon so as to support a blood vessel at a stenotic occlusion section, reduce the elastic retraction and reshaping of the blood vessel and keep the blood flow of the lumen unobstructed, and is clinically used for treating atherosclerosis by an interventional intravascular stent method. Nowadays, with the development of material manufacturing industry and technical level, the requirements for vascular stents are more and more, and although the treatment method of interventional vascular stents is very effective, the problems of restenosis, thrombus, endothelial hyperplasia and the like in blood vessels still can occur after operation, and the problems are closely related to the mechanical properties of the vascular stents.
Stents used after interventional procedures need to have both good radial support to restore the vessel diameter at the lesion site and good compliance to recover after adapting to the original geometry of the host vessel. Before the vascular stent is used, the stent also has good torsion performance to realize the torsion of the stent in the delivery process. In the prior art, no testing device with simple structure and convenient operation is used for testing the fatigue resistance of the intravascular stent so as to ensure the use safety of the intravascular stent.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the intravascular stent in-vitro torsion loading device which is simple in structure and convenient to operate and can effectively perform fatigue test on the intravascular stent.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a vascular stent external torsion loading device is characterized in that a left support frame and a right support frame are symmetrically arranged on a base, a fixing mechanism is arranged on the inner side surface of the left support frame, and a torsion mechanism is arranged on the inner side surface of the right support frame; the fixing mechanism comprises a fixing claw disc and a plurality of fixing claws, the fixing claws are circumferentially arranged on the fixing claw disc at intervals, and fixing clamping blocks are arranged at the end parts of the fixing claws; the torsion mechanism comprises a large gear, a power generation mechanism, a telescopic clamping rod and a reset mechanism, wherein the large gear can rotate in the circumferential direction, a plurality of L-shaped fixing rods are fixed on the inner side surface of a wheel disc of the large gear at equal intervals in the circumferential direction, the telescopic clamping rod is connected onto the fixing rods, the power generation mechanism is arranged at the bottom of the large gear, and the reset mechanism is arranged at the top of the large gear.
Furthermore, the bull gear passes through the bolt concentric connection on the second boss of right side support frame medial surface, and the bull gear is the gear that has the single tooth of a cogwheel, power generation mechanism includes motor and pinion, and the pinion is established in the bull gear bottom, pinion and the motor shaft coaxial coupling of motor, and under the initial condition, the tooth of a cogwheel of pinion meshes with the tooth of a cogwheel of bull gear mutually.
Furthermore, the reset mechanism comprises a first fixing plate, a second fixing plate, a spring and a convex block, wherein the convex block is arranged at the top of the large gear, the spring is positioned between the first fixing plate and the second fixing plate, the spring is fixedly connected with the convex block, the circle center of the large gear and the two fixing plates are positioned on the same vertical line, and the convex block is contacted with the inner side surface of the second fixing plate in an initial state.
Further, flexible screens pole includes sleeve and working lever, and sleeve one end cup joints on the dead lever and cup joints the working lever with the activity intracavity activity of third bolt fastening, the other end, and the one end threaded connection who is close to the working lever on the sleeve has the fourth bolt, and the working lever is the L type, is equipped with protruding piece at the medial extremity of working lever, but protruding piece joint is in vascular support's space.
Further, the fixed jaw dish utilizes the concentric fastening connection of first boss on screw and the left side support frame, the fixed clamp splice includes the fixed block of L type and removes clamp splice two parts, and fixed block fixed connection is at fixed jaw end, and the removal clamp splice is established on the medial surface of fixed block, removes between clamp splice and the fixed block through first bolt and second bolt fixed connection.
Further, the bull gear is transversely arranged concentrically with the first boss.
The invention has the beneficial effects that:
1. the intravascular stent in-vitro torsion loading device disclosed by the invention is simple in structure and convenient and fast to operate, and can be used for carrying out in-vitro torsion loading tests on intravascular stents of different specifications (namely different diameters and lengths) under the action of the adjustable fixing mechanism and the adjustable torsion mechanism;
2. the torsion angle of the intravascular stent can be changed by adjusting the number of gear teeth on the pinion, so that more comprehensive and more detailed test data can be obtained, and the intravascular stent can be automatically tested for fatigue performance by multiple aspects of regulation and control.
Drawings
FIG. 1 is a schematic structural diagram of a vascular stent in-vitro torsion loading device;
FIG. 2 is a schematic structural view of a portion of the securing mechanism;
FIG. 3 is a schematic structural view of a torsion mechanism portion;
wherein, 1-base, 2-left side support frame, 3-right side support frame, 4-fixing mechanism, 5-twisting mechanism, 6-blood vessel support;
21-a first boss;
31-a second boss;
41-fixed claw disc, 42-fixed claw and 43-fixed clamping block;
431-a fixed block, 432-a movable clamping block, 433-a first bolt, 434-a second bolt;
51-a large gear, 52-a power generation mechanism, 53-a telescopic clamping rod and 54-a reset mechanism;
511-fixing the bar;
521-motor, 522-pinion;
531-sleeve, 532-working rod, 533-third bolt, 534-fourth bolt, 535-convex block;
541-fixed plate one, 542-fixed plate two, 543-spring, 544-bump.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following further describes the technical solution of the present invention with reference to the accompanying drawings.
It should be noted that the embodiment provided by the present invention is only for effectively explaining the technical features of the present invention, and the terms of positioning such as left side, right side, upper end, lower end, etc. are only for better describing the embodiment of the present invention and should not be construed as limiting the technical solution of the present invention.
In order to efficiently and simply carry out an in-vitro torsion loading test on a vascular stent and to know the fatigue resistance of the vascular stent more clearly, the embodiment provides an in-vitro torsion loading device of the vascular stent, wherein a base 1 is symmetrically provided with a left support frame 2 and a right support frame 3, the inner side surface of the left support frame 2 is provided with a fixing mechanism 4, and the inner side surface of the right support frame 3 is provided with a torsion mechanism 5; the fixing mechanism 4 comprises a fixed claw disc 41 and a plurality of fixed claws 42, wherein the fixed claws 42 are circumferentially arranged on the fixed claw disc 41 at intervals, and the end parts of the fixed claws 42 are provided with fixed clamping blocks 43; the torsion mechanism 5 comprises a large gear 51, a power generation mechanism 52, a telescopic clamping rod 53 and a reset mechanism 54, wherein the large gear 51 can rotate circumferentially, a plurality of L-shaped fixing rods 511 are fixed on the inner side surface of a wheel disc of the large gear 51 at equal intervals circumferentially, the telescopic clamping rod 53 is connected to the fixing rods 511, the power generation mechanism 52 is arranged at the bottom of the large gear 51 and used for driving the large gear 51 to rotate, and the reset mechanism 54 is arranged at the top of the large gear 51 and used for resetting the large gear 51 after rotation.
The large gear 51 is concentrically connected to the second boss 31 on the inner side surface of the right support frame 3 through a bolt, the large gear 51 is a gear with single gear teeth, the power generation mechanism 52 comprises a motor 521 and a small gear 522, the small gear 522 is arranged at the bottom of the large gear 51, the small gear 522 is coaxially connected with a motor shaft of the motor 521, the small gear 522 is a gear with single gear teeth, and in an initial state, the gear teeth of the small gear 522 are meshed with the gear teeth of the large gear 51.
The reset mechanism 54 includes a first fixing plate 541, a second fixing plate 542, a spring 543 and a bump 544, the bump 544 is fixed on the top of the large gear 51, the spring 543 is located between the first fixing plate 541 and the second fixing plate 542, the spring 543 is fixedly connected with the bump 544, the center of the large gear 51 and the second fixing plate 542 are located on the same vertical line, and in an initial state, the bump 544 contacts with the inner side of the second fixing plate 542.
The telescopic clamping rod 53 comprises a sleeve 531 and a working rod 532, one end of the sleeve 531 is sleeved on the fixed rod 511 and fastened by a third bolt 533, the working rod 532 is movably sleeved in a movable cavity at the other end of the sleeve 531, a fourth bolt 534 is in threaded connection with one end of the sleeve 531, which is close to the working rod 532, the working rod 532 and the sleeve 531 can be fixed relatively by screwing the fourth bolt 534 inwards, the working rod 532 can freely stretch in the sleeve 531 after the fourth bolt 534 is unscrewed outwards to adjust the length of the telescopic clamping rod 53, so that the positioning requirements of intravascular stents 6 with different lengths can be met, the working rod 532 is L-shaped, a protruding block 535 is arranged at the inner side end of the working rod 532, and the protruding block 535 can be clamped in a gap of the intravascular stent 6 so as to drive the intravascular stent 6 to rotate.
The fixed jaw disc 41 is concentrically fastened and connected with the first boss 21 on the left support frame 2 through a screw, the fixed clamping block 43 comprises an L-shaped fixed block 431 and a movable clamping block 432, the fixed block 431 is fixedly connected to the end of the fixed jaw 42, the movable clamping block 432 is arranged on the inner side surface of the fixed block 431, through holes are formed in two ends of the movable clamping block 432, screw holes are formed in the positions, corresponding to the through holes, of the fixed block 431, and the movable clamping block 432 is fixedly connected with the fixed block 431 through first bolts 433 and second bolts 434 of the through holes and the screw holes in matched connection.
To ensure that the blood vessel support 6 can be kept horizontal during installation, the large gear 51 is arranged concentrically with the first boss 21.
The specific operation flow is as follows
Firstly, one end of the vascular stent 6 is fixed in the fixed clamping block 43 at the end part of the fixed clamping jaw 42, the movable clamping block 432 and the fixed block 431 are clamped relatively by the first bolt 433 and the second bolt 434, so that one end of the vascular stent 6 is clamped and fixed, and the fixing mechanism disclosed by the embodiment can be used for fixing vascular stents 6 with different diameters as the through groove formed by the movable clamping block 432 and the fixed block 431 has a certain length.
Then, the relative fixing positions of the sleeve 531 and the working rod 532 in each telescopic clamping rod 53 are adjusted, so that the convex block 535 at the end part of the working rod 532 can be clamped in the gap at the end part of the blood vessel support 6 and is in a contact state with the blood vessel support 6, and then the fourth bolt 534 is screwed in to complete the limiting and fixing work of the working rod 532 and the sleeve 531, and as the length of the telescopic clamping rod 53 is adjustable, the loading device can be suitable for the in-vitro test of the blood vessel supports 6 with different lengths.
During the test, motor 521 starts to drive pinion 522 clockwise, the bull gear 51 with the meshing of the last gear of pinion 522 can carry out anticlockwise meshing transmission, and then drive the working lever 532 with the contact of blood vessel support 6 and rotate, reach the effect of twisting blood vessel support 6, at this moment, spring 543 above bull gear 51 can take place the compression owing to receive the pressure of the same anticlockwise rotatory lug 544, when two gears break away from the meshing state, spring 543 in the compression state can kick-back and reset, and then bounce-back bull gear 51 back, lug 544 on bull gear 51 can be blocked by two fixed plates 542 and restrict the removal when bouncing back to a certain position, bull gear 51 returns initial position promptly at this moment. After the pinion 522 rotates to the initial position again under the action of the motor 521, the two gears are meshed to transmit, and the same process is repeated, so that the reciprocating (periodic) twisting motion of the blood vessel stent 6 can be realized through the rotation of the working rod 532.
In the embodiment, the angle of the transmission of the pinion 522 with a single gear tooth is 1 °, and of course, a plurality of gear teeth can be adjacently installed on the pinion 522, and the large gear 51 can rotate for a larger angle in a single time, so as to satisfy different degrees of twisting action of the vascular stent 6.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. However, the above description is only an example of the present invention, the technical features of the present invention are not limited thereto, and any other embodiments that can be obtained by those skilled in the art without departing from the technical solution of the present invention should be covered by the claims of the present invention.
Claims (6)
1. An external torsion loading device of a vascular stent is characterized in that a left support frame (2) and a right support frame (3) are symmetrically arranged on a base (1), a fixing mechanism (4) is arranged on the inner side surface of the left support frame (2), and a torsion mechanism (5) is arranged on the inner side surface of the right support frame (3); the fixing mechanism (4) comprises a fixing claw disc (41) and a plurality of fixing claws (42), wherein the plurality of fixing claws (42) are circumferentially arranged on the fixing claw disc (41) at intervals, and fixing clamping blocks (43) are arranged at the end parts of the fixing claws (42); the torsion mechanism (5) comprises a large gear (51), a power generation mechanism (52), a telescopic clamping rod (53) and a reset mechanism (54), wherein the large gear (51) can rotate circumferentially, a plurality of L-shaped fixing rods (511) are fixed on the inner side surface of a wheel disc of the large gear (51) at equal intervals circumferentially, the telescopic clamping rod (53) is connected onto the fixing rods (511), the power generation mechanism (52) is arranged at the bottom of the large gear (51), and the reset mechanism (54) is arranged at the top of the large gear (51).
2. The external torsion loading device of the blood vessel stent as claimed in claim 1, wherein the large gear (51) is concentrically connected to the second boss (31) on the inner side of the right supporting frame (3) through a bolt, the large gear (51) is a gear with single gear teeth, the power generating mechanism (52) comprises a motor (521) and a small gear (522), the small gear (522) is arranged at the bottom of the large gear (51), the small gear (522) is coaxially connected with a motor shaft of the motor (521), and in an initial state, the gear teeth of the small gear (522) are meshed with the gear teeth of the large gear (51).
3. The intravascular stent external torsion loading device according to claim 1, wherein the reset mechanism (54) comprises a first fixing plate (541), a second fixing plate (542), a spring (543) and a projection (544), the projection (544) is disposed at the top of the large gear (51), the spring (543) is located between the first fixing plate (541) and the second fixing plate (542), the spring (543) is fixedly connected with the projection (544), the center of the large gear (51) and the second fixing plate (542) are located on the same vertical line, and in an initial state, the projection (544) contacts with the inner side of the second fixing plate (542).
4. The intravascular stent in-vitro torsion loading device according to claim 1, wherein the telescopic clamping rod (53) comprises a sleeve (531) and a working rod (532), one end of the sleeve (531) is sleeved on the fixed rod (511) and is fastened by a third bolt (533), the working rod (532) is movably sleeved in a movable cavity at the other end, a fourth bolt (534) is connected to one end of the sleeve (531) close to the working rod (532) in a threaded manner, the working rod (532) is L-shaped, a protruding block (535) is arranged at the inner side end of the working rod (532), and the protruding block (535) can be clamped in a gap of the intravascular stent (6).
5. The intravascular stent external torsion loading device according to claim 1, wherein the fixed jaw plate (41) is concentrically and tightly connected with the first boss (21) on the left support frame (2) by a screw, the fixed clamping block (43) comprises two parts, namely an L-shaped fixed block (431) and a movable clamping block (432), the fixed block (431) is fixedly connected with the end part of the fixed jaw (42), the movable clamping block (432) is arranged on the inner side surface of the fixed block (431), and the movable clamping block (432) is fixedly connected with the fixed block (431) through a first bolt (433) and a second bolt (434).
6. The torsion loading device for the blood vessel stent in vitro as claimed in claim 5, wherein the large gear (51) is concentrically arranged with the first boss (21).
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| CN202011138111.0A CN112255129B (en) | 2020-10-22 | 2020-10-22 | External torsion loading device of vascular stent |
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| CN202011138111.0A CN112255129B (en) | 2020-10-22 | 2020-10-22 | External torsion loading device of vascular stent |
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| CN112255129B CN112255129B (en) | 2023-06-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117571522A (en) * | 2024-01-16 | 2024-02-20 | 首都医科大学附属北京友谊医院 | Vascular stent external loading testing device |
| CN118010336A (en) * | 2024-04-09 | 2024-05-10 | 太原理工大学 | Bending and twisting performance testing device for vascular stent |
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