CN112255129B - External torsion loading device of vascular stent - Google Patents
External torsion loading device of vascular stent Download PDFInfo
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- CN112255129B CN112255129B CN202011138111.0A CN202011138111A CN112255129B CN 112255129 B CN112255129 B CN 112255129B CN 202011138111 A CN202011138111 A CN 202011138111A CN 112255129 B CN112255129 B CN 112255129B
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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, which 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 fixing claws, a plurality of fixing claws are circumferentially arranged on the fixing claw disc at intervals, and fixing clamping blocks are arranged at the ends 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 fixing rods are fixed on the inner side surface of a wheel disc of the large gear at equal intervals, the telescopic clamping rod is connected to 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. The device simple structure, the simple operation, through adjustable fixed establishment and torsion mechanism's effect, can carry out external torsion loading test to the vascular support of different specifications, the suitability is strong, test data is comprehensive detail.
Description
Technical Field
The invention belongs to the technical field of vascular stent testing, and particularly relates to an in-vitro torsion loading device for vascular stents.
Background
The vascular stent is an external structure which is formed by placing an inner stent into a lesion section on the basis of the expansion and the formation of a lumen balloon so as to support a narrow occlusion section blood vessel, reduce the elastic retraction and reshaping of the blood vessel and keep the lumen blood flow smooth, and is clinically used for treating atherosclerosis by a method of intervening the vascular stent. Along with the development of the material manufacturing industry and the technical level, the requirements on the vascular stent are more and more, and the treatment method of the interventional vascular stent is quite effective, but the problems of restenosis, thrombus, endothelial hyperplasia and the like in the blood vessel can still occur after operation, and the problems are closely related to the mechanical properties of the vascular stent.
The stent used after the interventional operation has good radial supporting force to restore the vessel diameter of the lesion position and good compliance so as to restore the original shape after adapting to the original geometric shape of the host vessel. Before the vascular stent is used, the stent also ensures good torsion performance so as to realize the torsion of the stent in the conveying process. In the prior art, a testing device with a simple structure and convenient operation is not used for testing the fatigue resistance of the vascular stent so as to ensure the use safety of the vascular stent.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the external torsion loading device of the vascular stent, which has a simple structure and is convenient to operate, and can effectively perform fatigue test on the vascular stent.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the external torsion loading device of the vascular stent 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 fixing claws, a plurality of fixing claws are circumferentially arranged on the fixing claw disc at intervals, and fixing clamping blocks are arranged at the ends 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 circumferentially rotate, a plurality of L-shaped fixing rods are fixed on the inner side face of a wheel disc of the large gear at equal intervals, the telescopic clamping rod is connected to 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.
Further, the large gear is concentrically connected to the second boss on the inner side surface of the right support frame through a bolt, the large gear is a gear with single gear teeth, the power generation mechanism comprises a motor and a small gear, the small gear is arranged at the bottom of the large gear, the small gear is coaxially connected with a motor shaft of the motor, and in an initial state, the gear teeth of the small gear are meshed with the gear teeth of the large gear.
Further, the reset mechanism comprises a first fixed plate, a second fixed plate, a spring and a protruding block, the protruding block is arranged at the top of the large gear, the spring is positioned between the first fixed plate and the second fixed plate, the spring is fixedly connected with the protruding block, the circle center of the large gear and the fixed plate are positioned on the same vertical line, and in an initial state, the protruding block is in contact with the inner side face of the second fixed plate.
Further, flexible screens pole includes sleeve and working lever, and sleeve one end cup joints on the dead lever and with the activity intracavity activity of third bolt-up, the other end cup joints the working lever, and the one end threaded connection that is close to the working lever on the sleeve has the fourth bolt, and the working lever is L type, is equipped with protruding piece at the inboard tip of working lever, but protruding piece joint is in the space of vascular support.
Further, the fixed claw disc is concentrically and fixedly connected with the first boss on the left support frame by using a screw, the fixed clamping block comprises an L-shaped fixed block and a movable clamping block, the fixed block is fixedly connected with the end part of the fixed claw, the movable clamping block is arranged on the inner side surface of the fixed block, and the movable clamping block is fixedly connected with the fixed block by a first bolt and a second bolt.
Further, the large gear is arranged transversely and concentrically with the first boss.
The beneficial effects of the invention are as follows:
1. the intravascular stent external torsion loading device disclosed by the invention has a simple structure, is convenient to operate, can perform external torsion loading tests on intravascular stents with different specifications (namely different diameters and lengths) through the functions of the adjustable fixing mechanism and the torsion mechanism, and can reduce the risk of interventional operation of the intravascular stent and ensure the life safety of patients when the intravascular stent which is qualified in the test is used in interventional operation;
2. the torsion angle of the vascular stent can be changed by adjusting the number of gear teeth on the pinion, so that more comprehensive and detailed test data can be obtained, and the automatic fatigue performance test of the vascular stent can be realized by multi-aspect regulation and control.
Drawings
FIG. 1 is a schematic diagram of an extracorporeal torsion loading device of a vascular stent;
FIG. 2 is a schematic structural view of a portion of the securing mechanism;
FIG. 3 is a schematic view of the structure of the torsion mechanism portion;
wherein, the device comprises a 1-base, a 2-left side supporting frame, a 3-right side supporting frame, a 4-fixing mechanism, a 5-torsion mechanism and a 6-vascular stent;
21-a first boss;
31-a second boss;
41-fixed claw disc, 42-fixed claw, 43-fixed clamping block;
431-fixed block, 432-movable clamping block, 433-first bolt, 434-second bolt;
51-large gear, 52-power generation mechanism, 53-telescopic clamping rod and 54-reset mechanism;
511-a fixed rod;
521-motor, 522-pinion;
531-sleeve, 532-working rod, 533-third bolt, 534-fourth bolt, 535-bump;
541-first fixing plate, 542-second fixing plate, 543-spring, 544-bump.
Detailed Description
In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings.
It should be noted that the embodiments provided by the present invention are only for effectively describing the technical features of the present invention, and the positioning words such as left side, right side, upper end, lower end and the like are only for better describing the embodiments of the present invention, and are not to be construed as limiting the technical scheme of the present invention.
In order to perform an in-vitro torsion loading test on a vascular stent efficiently and simply so as to more clearly understand the fatigue resistance of the vascular stent, in the embodiment, a left side support frame 2 and a right side support frame 3 are symmetrically arranged on a base 1, a fixing mechanism 4 is arranged on the inner side surface of the left side support frame 2, and a torsion mechanism 5 is arranged on the inner side surface of the right side support frame 3; the fixing mechanism 4 comprises a fixing claw disc 41 and fixing claws 42, a 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 circumferentially rotate, 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, 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 of the right support 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, 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 fixed plate 541, a second fixed plate 542, a spring 543 and a protruding block 544, the protruding block 544 is fixed on the top of the gear wheel 51, the spring 543 is located between the first fixed plate 541 and the second fixed plate 542, the spring 543 is fixedly connected with the protruding block 544, the center of the gear wheel 51 and the second fixed plate 542 are located on the same vertical line, and in an initial state, the protruding block 544 contacts with the inner side surface of the second fixed 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 is 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, one end, close to the working rod 532, of the sleeve 531 is connected with a fourth bolt 534 in a threaded manner, the fourth bolt 534 is screwed inwards to realize the relative fixation of the working rod 532 and the sleeve 531, after the fourth bolt 534 is unscrewed outwards, the working rod 532 can freely stretch in the sleeve 531 to realize the adjustment of the length of the telescopic clamping rod 53, the positioning requirements of vascular stents 6 with different lengths are met, the working rod 532 is L-shaped, a protruding block 535 is arranged at the inner end part of the working rod 532, and the protruding block 535 can be clamped in a gap of the vascular stent 6 so as to drive the vascular stents 6 to rotate.
The fixed jaw 41 is concentrically and fixedly connected with the first boss 21 on the left support frame 2 by using 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 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, through holes are formed in two ends of the movable clamping block 432, screw holes are formed in 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 by a first bolt 433 and a second bolt 434, which are correspondingly arranged in a matching connection manner, of the through holes and the screw holes.
To ensure that the stent 6 remains horizontal during installation, the gearwheel 51 is arranged concentrically with the first boss 21.
The specific operation flow is as follows
First, one end of the stent 6 is fixed in the fixed clamping block 43 at the end of the fixed 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 stent 6 is clamped and fixed, and the through slot formed by the movable clamping block 432 and the fixed block 431 has a certain length, so that the stent 6 with different diameters can be fixed by the fixing mechanism disclosed in the embodiment.
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 protruding blocks 535 at the end of the working rod 532 can be clamped in the gaps at the end of the vascular stent 6 and are in contact with the vascular stent 6, and the fourth bolt 534 is screwed in to complete the limiting and fixing work of the working rod 532 and the sleeve 531, and the length of the telescopic clamping rod 53 is adjustable, so that the loading device can be suitable for in vitro tests of vascular stents 6 with different lengths.
During testing, the motor 521 is started to drive the pinion 522 to rotate clockwise, the large gear 51 meshed with the gear teeth on the pinion 522 can perform counterclockwise meshing transmission, and then the working rod 532 contacted with the intravascular stent 6 is driven to rotate, so that the intravascular stent 6 is twisted, at this time, the spring 543 above the large gear 51 is compressed due to the pressure of the lug 544 which rotates counterclockwise, when the two gears are disengaged, the spring 543 in the compressed state can rebound to restore the large gear 51, and then the large gear 51 rebounds to a certain position, the lug 544 on the large gear 51 is blocked by the fixing plate two 542 to limit movement, and at this time, the large gear 51 returns to the initial position. After the pinion 522 rotates again to the initial position under the action of the motor 521, the two gears are engaged and driven again, and the same procedure is repeated, so that the reciprocating (periodical) torsion motion of the vascular stent 6 can be realized through the rotation of the working rod 532.
In this embodiment, the pinion 522 with a single gear tooth is designed to realize a transmission angle of 1 °, and a plurality of gear teeth may be adjacently mounted on the pinion 522, so that the large gear 51 can rotate a larger angle at a time, thereby satisfying different degrees of twisting actions on the vascular stent 6.
The foregoing has outlined and described the basic principles, features, and advantages of the present invention. However, the foregoing is merely specific examples of the present invention, and the technical features of the present invention are not limited thereto, and any other embodiments that are derived by those skilled in the art without departing from the technical solution of the present invention are included in the scope of the present invention.
Claims (5)
1. The external torsion loading device of the 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 fixing claws (42), a 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 ends 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 circumferentially rotate, 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 in the circumferential direction, 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 the reset mechanism (54) is arranged at the top of the large gear (51);
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 part of the fixed clamping 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);
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, 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 part of the working rod (532), and the protruding block (535) can be clamped in a gap of the vascular stent (6).
2. An extracorporeal torsion loading device of a vascular stent as claimed in claim 1, wherein the large gear (51) is concentrically connected to the second boss (31) on the inner side surface of the right supporting frame (3) through bolts, 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. An external torsion loading device for a vascular stent as in claim 1, wherein the restoring mechanism (54) comprises a first fixed plate (541), a second fixed plate (542), a spring (543) and a protruding block (544), the protruding block (544) is arranged at the top of the large gear (51), the spring (543) is arranged between the first fixed plate (541) and the second fixed plate (542), the spring (543) is fixedly connected with the protruding block (544), the center of the large gear (51) and the second fixed plate (542) are positioned on the same vertical line, and in an initial state, the protruding block (544) is contacted with the inner side surface of the second fixed plate (542).
4. An extracorporeal torsion loading device of a vascular stent as claimed in claim 1, wherein the fixed jaw disc (41) is fastened concentrically with the first boss (21) on the left stent (2) by means of screws.
5. An extracorporeal torsion loading device of a vascular stent as claimed in claim 4, wherein the large gear (51) is arranged concentrically with the first boss (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011138111.0A CN112255129B (en) | 2020-10-22 | 2020-10-22 | External torsion loading device of vascular stent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011138111.0A CN112255129B (en) | 2020-10-22 | 2020-10-22 | External torsion loading device of vascular stent |
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| CN112255129A CN112255129A (en) | 2021-01-22 |
| CN112255129B true CN112255129B (en) | 2023-06-27 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117571522B (en) * | 2024-01-16 | 2024-05-14 | 首都医科大学附属北京友谊医院 | Vascular stent external loading testing device |
| CN118010336B (en) * | 2024-04-09 | 2024-06-04 | 太原理工大学 | Bending and twisting performance testing device for vascular stent |
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| CN112255129A (en) | 2021-01-22 |
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