CN110617955A - External testing device for fatigue performance of blood vessel support - Google Patents

Abstract

The invention relates to the technical field of blood vessel stent testing, in particular to an in vitro testing device for fatigue performance of a blood vessel stent, which comprises a base, wherein a supporting frame is arranged on the base, a diameter-expanding mechanism is detachably fixed on the supporting frame, the diameter-expanding mechanism comprises a fixed shaft, a slide block and a support rod unit, the support rod unit comprises a first support rod, a second support rod and a working rod, the working rod is respectively hinged with the first support rod and the second support rod, the first support rod is hinged with the fixed shaft, the second support rod is hinged with the slide block, the support rod unit comprises more than two support rods and is arranged around the fixed shaft at intervals in the circumferential direction, the slide block is sleeved on the fixed shaft, two ends of the fixed shaft are detachably fixed on the supporting frame, a motor drives the slide block to reciprocate along the axial direction of the fixed shaft through a crank connecting rod mechanism to, the moving energy of the sliding block drives the working rod to stretch and retract so as to realize reciprocating expansion of the intravascular stent, and the whole device has a simple structure and is convenient to operate.

Description

An in vitro test device for fatigue performance of vascular stent

technical field

The invention relates to the technical field of vascular stent testing, in particular to an in vitro testing device for fatigue performance of vascular stents.

Background technique

Clinically, interventional vascular stents are often used to treat atherosclerosis. Nowadays, this technology is constantly developing, and there are more and more requirements for vascular stents. Interventional vascular stent therapy is very effective, but problems such as intravascular restenosis and thrombosis still occur after surgery. These are closely related to the mechanical properties of vascular stents.

When the vascular stent is in use, it is in a contracted state first, and then expands after entering the lesion area. In the prior art, there is no test device with simple structure and convenient operation for testing the anti-fatigue performance of vascular stents.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and provide an in vitro test device for fatigue performance of vascular stents with simple structure and convenient operation, which can effectively perform fatigue tests on vascular stents.

The technical solution adopted by the present invention to solve the technical problem is: an in vitro test device for fatigue performance of vascular stents, comprising a base, a support frame is arranged on the base, a detachable fixed brace mechanism on the support frame, the brace mechanism includes a fixed shaft, The slider and the strut unit, the strut unit includes a first strut, a second strut and a working rod, one end of the first strut is hinged on the fixed shaft, the other end of the first strut hangs outwards, and the second strut One end of the pole is hinged on the slide block, the other end of the second pole hangs outwards, and the other end of the first pole and the other end of the second pole are close to each other, and the two ends of the working rod are respectively connected to the first pole. The other end of the strut and the other end of the second strut are hinged, the rod length direction of the working rod is parallel to the axial length direction of the fixed shaft, more than two strut units are arranged at circumferential intervals around the fixed shaft, and the vascular stent It is sleeved on the outside of the annular support part formed by the working rods in all the strut units. The slider is sleeved on the fixed shaft. The two ends of the fixed shaft are detachably fixed on the support frame. The motor is fixed on the support frame. The motor passes through the The crank-link mechanism drives the sliding block to move back and forth along the axial direction of the fixed shaft to drive the radial telescopic movement of the annular support part.

The support frame includes a first vertical plate and a second vertical plate with two plate faces facing each other and parallel to each other, the first vertical plate is detachably fixed on the base, a first through hole is opened on the first vertical plate, and the second vertical plate A second through hole is provided on the plate, and the two ends of the fixed shaft are inserted and fixed in the first through hole and the second through hole respectively.

The first protrusion is fixed on the outer surface of the first vertical plate, the first threaded hole is provided on the first protrusion, the first threaded hole communicates with the first through hole and the centerline of the hole coincides, the outer side of the second vertical plate The second protrusion is fixed on the board, and a second threaded hole is opened on the second protrusion. The second threaded hole communicates with the second through hole and the center line of the hole coincides. The first threaded hole and the second threaded hole respectively match the first threaded hole. The two ends of the fixed shaft are compressed and locked by the bolt and the second bolt.

The middle part of the lower end of the first vertical plate is provided with a third protrusion, and the upper surface of the base is provided with a card slot and a limiting slot. The card slot and the limiting slot are connected and the two are combined into a T shape. The first stopper is arranged at the surface position, the card slot is arranged between the limit groove and the stopper, the second stopper is inserted in the limiter groove, the upper end of the second stopper protrudes outside the limiter groove, the first vertical The third protrusion at the lower end of the board is inserted into the slot, and the first stopper and the second stopper clamp and fix the board surface of the first vertical board.

The hinge axis centerline between the first pole and the fixed shaft, the hinge axis centerline between the second pole and the slider, the two ends of the working rod and the first pole, the second pole The centerlines of the hinged shafts are arranged perpendicular to the axial length direction of the fixed shaft.

The fixed shaft is a stepped shaft, the stepped shaft is spliced by a small-diameter shaft and a large-diameter shaft, the slider is sleeved on the small-diameter shaft, and the first support rod is hinged to the middle of the shaft body of the large-diameter shaft.

Beneficial effect: when in use, the vascular stent is first sleeved on the outside of the ring-shaped support part formed by all the working rods in the brace mechanism, and the working rod spreads the hollow tubular vascular stent, starts the motor, and the motor passes through the crank connecting rod mechanism Drive the slider to move back and forth along the axial direction of the fixed shaft. Since the working rod is hinged with the first rod and the second rod, and the first rod and the fixed shaft are hinged, the second rod and the slider The rod length direction of the working rod is parallel to the axial length direction of the fixed shaft, so the movement of the slider can drive the working rod to expand and contract to realize the reciprocating stretching fatigue test of the vascular stent. The whole device has a relatively simple structure and is easy to operate. Realize the automatic fatigue performance test of vascular stents.

Description of drawings

Fig. 1 is the structural diagram that the present invention cooperates with vascular stent;

Fig. 2 is a structural diagram of the present invention;

Fig. 3 is a partially exploded view of the present invention.

Detailed ways

The present invention will be further described below in conjunction with Figs. 1-3.

An in vitro test device for the fatigue performance of a vascular stent, comprising a base 10, a support frame is arranged on the base 10, a detachable fixed brace mechanism 20 on the support frame, the brace mechanism 20 includes a fixed shaft 21, a slider 25 and a brace unit, The strut unit comprises a first strut 22, a second strut 23 and a working rod 24, one end of the first strut 22 is hinged on the fixed shaft 21, the other end of the first strut 22 overhangs outwards, and the second strut 22 One end of bar 23 is hinged on slide block 25, and the other end of second pole 23 overhangs outwards, and the other end of first pole 22 and the other end of second pole 23 are close to each other, and the two ends of working bar 24 The ends are respectively hinged with the other end of the first pole 22 and the other end of the second pole 23, the rod length direction of the working rod 24 is parallel to the axial length direction of the fixed shaft 21, and there are more than two pole units fixed around The circumferential spacing of the shaft 21 is arranged, the vascular support 30 is sleeved outside the annular support part formed by the working rod 24 in all the strut units, the slider 25 is sleeved on the fixed shaft 21, and the two ends of the fixed shaft 21 are detachable Fixed on the support frame, the motor 40 is fixed on the support frame, and the motor 40 drives the slider 25 to move back and forth along the axial direction of the fixed shaft 21 through the crank linkage 50 to drive the radial telescopic movement of the annular support part.

When in use, the vascular stent 30 is first sleeved on the outside of the annular support part formed by all the working rods 24 in the brace mechanism 20, the working rod 24 stretches the hollow tubular vascular stent 30, starts the motor 40, and the motor 40 passes The crank-link mechanism 50 drives the slider 25 to move back and forth along the axial direction of the fixed shaft 21. Since the working rod 24 is hinged with the first strut 22 and the second strut 23, and the first strut 22 and the fixed shaft 21 is hinged, and the second pole 23 is hinged with the slider 25. The rod length direction of the working rod 24 is parallel to the axial length direction of the fixed shaft 21, so the movement of the slider 25 can drive the working rod 24 to expand and contract to realize the adjustment of the blood vessel. For the reciprocating stretching fatigue test of the stent 30 , the entire device has a relatively simple structure and is easy to operate, and can realize an automatic fatigue performance test on the vascular stent 30 . In addition, the motor 40 can be used to adjust the moving range of the slider 25 , so as to adjust the expansion diameter, so as to meet the expansion test of the vascular stent 30 with different diameter requirements. When it is necessary to detect a group of vascular stents 30 at the same time, a set of vascular stents 30 can be placed on the stents in turn, so that a group of vascular stents 30 can be simultaneously diagnosed. Move towards the opening, greatly improving the test efficiency.

Preferably, the support frame includes a first vertical plate 61 and a second vertical plate 62 with two plates facing each other and parallel to each other, the first vertical plate 61 is detachably fixed on the base 10, and the first vertical plate 61 is provided with The first through hole and the second vertical plate 62 are provided with a second through hole, and the two ends of the fixed shaft 21 are inserted and fixed in the first through hole and the second through hole respectively.

Further, the first protrusion 63 is fixed on the outer surface of the first vertical plate 61, the first protrusion 63 is provided with a first threaded hole, the first threaded hole communicates with the first through hole and the centerline of the hole coincides, The second protrusion 64 is fixed on the outer plate surface of the second vertical plate, and the second threaded hole is offered on the second protrusion 64, and the second threaded hole communicates with the second through hole and the center line of the hole coincides, and the first threaded hole and the second threaded hole coincide. The first bolt 65 and the second bolt 66 are fitted in the two threaded holes respectively to compress and lock the two ends of the fixed shaft 21 . The fixed shaft 21 is firmly fixed by the first bolt 65 and the second bolt 66 to ensure that the test is carried out smoothly, and by adjusting the screwing degree of the first bolt 65 and the second bolt 66, the radial expansion range can be changed. For example, the second bolt 66 is screwed back, and the first bolt 65 is screwed in, so that the fixed shaft 21 moves to the end where the second bolt 66 is located, so that the radial expansion range becomes larger; otherwise, the radial expansion range becomes smaller.

Further, the middle part of the lower end of the first vertical plate 61 is provided with a third protrusion 611, and the upper surface of the base 10 is provided with a locking groove 11 and a limiting groove 12, and the locking groove 11 and the limiting groove 12 communicate and are combined into a T-shaped, the first block 13 is arranged on the upper surface of the base 10 on one side of the card slot 11, the card slot 11 is arranged between the limit slot 12 and the stop block 13, and the second stop block is inserted in the limit slot 12 14. The upper end of the second stopper 14 protrudes outside the limiting groove 12, the third protrusion 611 at the lower end of the first vertical plate 61 is inserted inside the card slot 11 and the first stopper 13 and the second stopper 14 connect the second The plate surface of a vertical plate 61 is clamped and fixed. To replace the vascular stent 30, only need to pull out the second block 14 to remove the first vertical plate 61, which is more convenient.

In order to ensure that the ring-shaped support part formed by the working rod 24 can expand and contract in the radial direction, the centerline of the hinge shaft between the first support rod 22 and the fixed shaft 21, the center line of the hinge shaft between the second support rod 23 and the slider 25 The center line of the hinge axis, the two ends of the working rod 24 and the center line of the hinge axis between the first strut 22 and the second strut 23 are all arranged perpendicular to the axial length direction of the fixed shaft 21.

Preferably, the fixed shaft 21 is a stepped shaft, the stepped shaft is spliced by a small diameter shaft and a large diameter shaft, the slider 25 is sleeved on the small diameter shaft, and the middle part of the first support rod 22 and the large diameter shaft hinged. The step between the small-diameter shaft and the large-diameter shaft can limit the movement of the slider 25 .

It should be understood that the specific embodiments described above are only used to explain the present invention, not to limit the present invention. Obvious changes or variations derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (6)

1. The utility model provides an external testing arrangement of vascular support fatigue performance which characterized in that: comprises a base (10), a supporting frame is arranged on the base (10), a diameter supporting mechanism (20) is detachably fixed on the supporting frame, the diameter supporting mechanism (20) comprises a fixed shaft (21), a sliding block (25) and a supporting rod unit, the supporting rod unit comprises a first supporting rod (22), a second supporting rod (23) and a working rod (24), one end of the first supporting rod (22) is hinged on the fixed shaft (21), the other end of the first supporting rod (22) is outwards suspended and extended, one end of the second supporting rod (23) is hinged on the sliding block (25), the other end of the second supporting rod (23) is outwards suspended and extended, the other end of the first supporting rod (22) and the other end of the second supporting rod (23) are close to each other, two ends of the working rod (24) are respectively hinged with the other end of the first supporting rod (22) and the other end of the second supporting rod (23), the rod length direction of the working rod (24) is parallel to the shaft length direction of the, the supporting rod units are more than two and are arranged at intervals along the circumferential direction of the fixed shaft (21), the blood vessel support (30) is sleeved outside an annular supporting part surrounded by working rods (24) in all the supporting rod units, the sliding block (25) is sleeved on the fixed shaft (21), two ends of the fixed shaft (21) are detachably fixed on the supporting frame, the motor (40) is fixed on the supporting frame, and the motor (40) drives the sliding block (25) to move back and forth along the axial direction of the fixed shaft (21) through a crank connecting rod mechanism (50) so as to drive the annular supporting part to move radially in a telescopic mode.

2. The in vitro testing device for fatigue performance of the blood vessel stent of claim 1, wherein: the support frame comprises a first vertical plate (61) and a second vertical plate (62) which are opposite in plate surfaces and parallel to each other, the first vertical plate (61) is detachably fixed on the base (10), a first through hole is formed in the first vertical plate (61), a second through hole is formed in the second vertical plate (62), and two ends of the fixing shaft (21) are respectively inserted and fixed in the first through hole and the second through hole.

3. The in vitro testing device for fatigue performance of the blood vessel stent according to claim 2, wherein: a first convex block (63) is fixed on the outer side plate surface of the first vertical plate (61), a first threaded hole is formed in the first convex block (63), the first threaded hole is communicated with the first through hole, the center line of the hole is coincident, a second convex block (64) is fixed on the outer side plate surface of the second vertical plate, a second threaded hole is formed in the second convex block (64), the second threaded hole is communicated with the second through hole, the center line of the hole is coincident, and the first threaded hole and the second threaded hole are respectively matched with a first bolt (65) and a second bolt (66) to press and lock the two ends of the fixed shaft (21).

4. The in vitro testing device for fatigue performance of the blood vessel stent of claim 3, wherein: the middle part of the lower end of the first vertical plate (61) is provided with a third bump (611), the upper surface of the base (10) is provided with a clamping groove (11) and a limiting groove (12), the clamping groove (11) is communicated with the limiting groove (12) and the limiting groove (12) are combined into a T shape, a first stop block (13) is arranged at the position of the upper surface of the base (10) on one side of the clamping groove (11), the clamping groove (11) is arranged between the limiting groove (12) and the stop block (13), a second stop block (14) is inserted into the limiting groove (12), the upper end of the second stop block (14) protrudes out of the limiting groove (12), the third bump (611) at the lower end of the first vertical plate (61) is inserted into the clamping groove (11), and the first stop block (13) and the second stop block (14) clamp and fix the surface of the first.

5. The in vitro testing device for fatigue performance of the blood vessel stent according to claim 4, wherein: the central line of a hinge shaft between the first support rod (22) and the fixed shaft (21), the central line of a hinge shaft between the second support rod (23) and the sliding block (25), the central lines of two ends of the working rod (24), the hinge shaft between the first support rod (22) and the second support rod (23) and the axial length direction of the fixed shaft (21) are vertically arranged.

6. The in vitro testing device for fatigue performance of the blood vessel stent of claim 5, wherein: fixed axle (21) are the step axle, and the step axle is formed by little diameter axle and the concatenation of big diameter axle, and slider (25) cover is established on little diameter axle, and first branch (22) are articulated with the axle body middle part of big diameter axle.