CN112255129B - External torsion loading device of vascular stent - Google Patents

Abstract

The invention discloses an in vitro torsion loading device for a vascular stent. A left support frame and a right support frame are symmetrically arranged on a base, a fixing mechanism is provided on the inner side of the left support frame, and a fixing mechanism is arranged on the inner side of the right support frame. There is a twisting mechanism; the fixing mechanism includes a fixed claw plate and a fixed claw, and several fixed claws are arranged on the fixed claw disk at a circumferential distance, and a fixed clamp is arranged at the end of the fixed claw; the twisting mechanism includes a large gear, a power generator Mechanism, telescopic clamping rod and reset mechanism, several L-shaped fixed rods are fixed at equal distances around the inner surface of the wheel disc of the large gear, and telescopic clamping rods are connected on the fixed rods, and the power generating mechanism is located on the large gear. At the bottom of the gear, the reset mechanism is located at the top of the bull gear. The device has a simple structure and is easy to operate. Through the function of the adjustable fixing mechanism and the torsion mechanism, it can perform in vitro torsional loading tests on vascular stents of different specifications. It has strong applicability and comprehensive and detailed test data.

Description

An in vitro torsional loading device for a vascular stent

technical field

The invention belongs to the technical field of vascular stent testing, and in particular relates to an in vitro torsional loading device for a vascular stent.

Background technique

Vascular stent refers to an external stent that is placed in the lesion on the basis of lumen balloon expansion to support the stenotic and occluded vessel, reduce the elastic retraction and reshaping of the vessel, and maintain the smooth blood flow in the lumen. The structure is commonly used clinically to treat atherosclerosis with interventional vascular stents. Nowadays, with the development of material manufacturing industry and technical level, there are more and more requirements for vascular stents. Although the treatment method of interventional vascular stents is very effective, intravascular restenosis, thrombosis and Endothelial hyperplasia and other problems are closely related to the mechanical properties of vascular stents.

The stent used after interventional surgery should not only have good radial support force to restore the diameter of the blood vessel at the lesion site, but also have good compliance to restore the original shape after adapting to the original geometric shape of the host blood vessel. Before the vascular stent is used, the stent must also ensure good torsion performance, so as to realize the torsion of the stent during delivery. In the prior art, there is no test device with simple structure and convenient operation for testing the anti-fatigue performance of vascular stents to ensure the safety of vascular stents.

Contents of the invention

In view of the above existing problems, the present invention aims to provide an in vitro torsional loading device for vascular stents with simple structure and convenient operation, which can effectively perform fatigue tests on vascular stents.

In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: an in vitro torsional loading device for a vascular stent, a left support frame and a right support frame are symmetrically arranged on the base, and a The fixing mechanism is provided with a torsion mechanism on the inner side of the right support frame; the fixing mechanism includes a fixed claw plate and a fixed claw, and several fixed claws are arranged on the fixed claw disk at circumferential intervals, and a fixed claw is provided at the end of the fixed claw. There is a fixed clamp block; the torsion mechanism includes a large gear, a power generating mechanism, a telescopic locking rod and a reset mechanism. The large gear can rotate in the circumferential direction, and several L-shaped rings are fixed on the inner surface of the wheel of the large gear at equal distances. The fixed rod is connected with a telescopic locking rod, the power generating mechanism is arranged at the bottom of the bull gear, and the reset mechanism is arranged at the top of the bull gear.

Further, the large gear is concentrically connected to the second boss on the inner side of the right support frame through bolts, the large gear is a gear with single teeth, the power generating mechanism includes a motor and a pinion, and the pinion is located on the large At the bottom of the gear, the pinion is coaxially connected with the motor shaft of the motor. In the initial state, the teeth of the pinion mesh with the teeth of the large gear.

Further, the reset mechanism includes a fixed plate 1, a fixed plate 2, a spring and a bump, the bump is arranged on the top of the large gear, the spring is located between the fixed plate 1 and the fixed plate 2, and the spring is fixedly connected to the bump, The center of the bull gear and the second fixed plate are located on the same vertical line, and in the initial state, the projection is in contact with the inner surface of the second fixed plate.

Further, the telescopic clamping rod includes a sleeve and a working rod, one end of the sleeve is sleeved on the fixed rod and fastened with a third bolt, and the other end of the movable cavity is movably socketed with the working rod, and the sleeve is close to A fourth bolt is threadedly connected to one end of the working rod, the working rod is L-shaped, and a protruding block is provided at the inner end of the working rod, and the protruding block can be snapped into the gap of the vascular support.

Further, the fixed claw plate is fastened concentrically with the first boss on the left support frame by screws, and the fixed clamp block includes two parts: an L-shaped fixed block and a movable clamp block, and the fixed block is fixedly connected to the fixed claw At the end, the movable clamping block is arranged on the inner side of the fixed block, and the movable clamping block and the fixed block are fixedly connected by first bolts and second bolts.

Further, the large gear is arranged concentrically with the first boss laterally.

The beneficial effects of the present invention are:

1. The in vitro torsion loading device for a vascular stent disclosed by the present invention has a simple structure and convenient operation. Through the action of an adjustable fixing mechanism and a torsion mechanism, vascular stents of different specifications (that is, different diameters and lengths) can be twisted in vitro. Loading test, the qualified vascular stent is used in interventional surgery, which can reduce the risk of vascular stent interventional surgery and ensure the safety of patients' lives;

2. The torsion angle of the vascular stent can be changed by adjusting the number of teeth on the pinion, so as to obtain more comprehensive and detailed test data, and multi-faceted regulation to realize the automatic fatigue performance test of the vascular stent.

Description of drawings

Fig. 1 is a schematic structural view of an in vitro torsional loading device for a vascular stent;

Fig. 2 is a structural schematic diagram of the fixing mechanism part;

Fig. 3 is a schematic structural view of the torsion mechanism part;

Among them, 1-base, 2-left support frame, 3-right support frame, 4-fixing mechanism, 5-torsion mechanism, 6-vascular stent;

21 - the first boss;

31 - the second boss;

41-fixed claw plate, 42-fixed claw, 43-fixed clamp block;

431-fixed block, 432-movable clamp block, 433-the first bolt, 434-the second bolt;

51-big gear, 52-power generating mechanism, 53-telescopic locking rod, 54-resetting mechanism;

511 - fixed rod;

521-motor, 522-pinion;

531-sleeve, 532-working rod, 533-the third bolt, 534-the fourth bolt, 535-protruding block;

541-fixed plate one, 542-fixed plate two, 543-spring, 544-projection.

Detailed ways

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 will be further described below in conjunction with the accompanying drawings.

It should be noted that the embodiments provided by the present invention are only for effectively explaining the technical features of the present invention, and the positioning words such as left, right, upper end, and lower end are only for better understanding of the embodiments of the present invention. The description should not be regarded as a limitation on the technical solution of the present invention.

In order to perform in vitro torsional loading tests on vascular stents efficiently and simply, so as to better understand the anti-fatigue performance of vascular stents, this embodiment provides an in vitro torsional loading device for vascular stents, which is symmetrically provided with left supports on the base 1 Frame 2 and right support frame 3 are provided with fixing mechanism 4 on the inner side surface of left side supporting frame 2, and are provided with torsion mechanism 5 on the inner side surface of right side supporting frame 3; Fixing mechanism 4 comprises fixed claw plate 41 and Fixed claws 42, several fixed claws 42 are arranged on the fixed claw plate 41 at a circumferential distance, and fixed clamping blocks 43 are arranged at the ends of the fixed claws 42; the twisting mechanism 5 includes a large gear 51, a power generating mechanism 52, a telescopic The locking rod 53 and the reset mechanism 54, the large gear 51 can rotate in the circumferential direction, and several L-shaped fixed rods 511 are fixed at equal distances around the inner surface of the wheel disk of the large gear 51, and the fixed rods 511 are connected with telescopic The locking rod 53 and the power generating mechanism 52 are arranged at the bottom of the bull gear 51 for driving the bull gear 51 to rotate, and the top of the bull gear 51 is provided with a reset mechanism 54 for resetting the bull 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 bolts. The large gear 51 is a gear with single teeth. The power generating mechanism 52 includes a motor 521 and a pinion 522. The gear 522 is located at the bottom of the bull gear 51, and the pinion 522 is coaxially connected with the motor shaft of the motor 521. The pinion 522 is a gear with a single tooth. The teeth mesh.

Described reset mechanism 54 comprises fixed plate one 541, fixed plate two 542, spring 543 and projection 544, and projection 544 is fixed on the top of bull gear 51, and spring 543 is positioned between fixed plate one 541 and fixed plate two 542, and spring 543 is fixedly connected with the protrusion 544, and the center of circle of the gear wheel 51 is located on the same vertical line as the second fixed plate 542. In the initial state, the protrusion 544 is in contact with the inner surface of the second fixed plate 542.

The telescopic locking rod 53 includes a sleeve 531 and a working rod 532. One end of the sleeve 531 is sleeved on the fixed rod 511 and fastened with a third bolt 533. One end of the sleeve 531 close to the working rod 532 is threaded with a fourth bolt 534, and the fourth bolt 534 can be screwed inward to realize the relative fixing of the working rod 532 and the sleeve 531, and the fourth bolt 534 can be loosened outwards and the working rod 532 can be freely expanded and contracted in the sleeve 531 to realize the adjustment of the length of the telescopic clamping rod 53, thereby adapting to the positioning needs of the vascular stent 6 with different lengths. Block 535 , the protruding block 535 can be snapped into the gap of the vascular stent 6 so as to drive the vascular stent 6 to rotate.

The fixed jaw plate 41 is fastened and connected concentrically with the first boss 21 on the left support frame 2 by screws, and the fixed clamp block 43 includes two parts: an L-shaped fixed block 431 and a movable clamp block 432, and the fixed block 431 is fixedly connected At the end of the fixed claw 42, the movable clamping block 432 is arranged on the inner side of the fixed block 431, and a through hole is provided at both ends of the movable clamping block 432, and a screw hole is provided at the position corresponding to the through hole on the fixed block 431, The movable clamping block 432 is fixedly connected to the fixed block 431 through first bolts 433 and second bolts 434 that are matched and connected to correspondingly provided through holes and screw holes.

In order to ensure that the vascular stent 6 can be kept horizontal during installation, the large gear 51 is arranged concentrically with the first boss 21 .

The specific operation process is as follows

First, one end of the blood vessel support 6 is fixed in the fixed clamp block 43 at the end of the fixed jaw 42, and the movable clamp block 432 and the fixed block 431 are relatively clamped by the first bolt 433 and the second bolt 434, so that one end of the blood vessel support 6 Clamped and fixed, since the through groove formed by the movable clamping block 432 and the fixed block 431 has a certain length, the fixing mechanism disclosed in this embodiment can realize the fixing of vascular stents 6 with different diameters.

Then adjust the relative fixed positions of the sleeve 531 and the working rod 532 in each telescopic locking rod 53, so that the protruding block 535 at the end of the working rod 532 can be stuck in the gap at the end of the vascular support 6 and be in contact with the vascular support 6 state, and then screw in the fourth bolt 534 to complete the work of limiting and fixing the working rod 532 and the sleeve 531. Since the length of the telescopic locking rod 53 is adjustable, the loading device can be applied to different lengths of the vascular stent 6. in vitro testing.

During the test, the motor 521 starts to drive the pinion 522 to rotate clockwise, and the large gear 51 meshing with the upper teeth of the pinion 522 can carry out the meshing transmission counterclockwise, and then drives the working rod 532 in contact with the vascular support 6 to rotate to achieve twisting The effect of the vascular support 6, at this time, the spring 543 above the large gear 51 will be compressed due to the pressure of the bump 544 that also rotates counterclockwise. When the two gears are out of mesh, the spring 543 in the compressed state will rebound and reset , And then the bull gear 51 is bounced back, when rebounding to a certain position, the projection 544 on the bull gear 51 will be blocked by the fixed plate 2 542 and limit the movement, and now the bull gear 51 returns to the initial position. After the pinion 522 is rotated to the initial position again under the action of the motor 521, the two gears will be meshed again, and the same process will be repeated, so that the reciprocation of the vascular support 6 can be realized by the rotation of the working rod 532 (periodic ) twisting motion.

In this embodiment, the pinion gear 522 with a single gear tooth is designed to achieve a transmission angle of 1°. Of course, a plurality of gear teeth can be adjacently installed on the pinion gear 522, and the large gear 51 can rotate a larger angle at a time. To meet the torsion action of the vascular stent 6 in different degrees.

The basic principles, main features and advantages of the present invention have been shown and described above. However, the above descriptions are only specific embodiments of the present invention, and the technical features of the present invention are not limited thereto. Any other implementations that are obtained by those skilled in the art without departing from the technical solutions of the present invention should be included in the present invention. Invention within the patent scope.

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).

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