CN215677862U - Blood vessel covered stent aligning force test experiment platform - Google Patents
Blood vessel covered stent aligning force test experiment platform Download PDFInfo
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- CN215677862U CN215677862U CN202121676693.8U CN202121676693U CN215677862U CN 215677862 U CN215677862 U CN 215677862U CN 202121676693 U CN202121676693 U CN 202121676693U CN 215677862 U CN215677862 U CN 215677862U
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Abstract
The utility model relates to a blood vessel covered stent aligning force test experiment table, which comprises: the fixing component is used for adjusting and fixing the vascular graft stent to be detected; the test component is used for bending the blood vessel covered stent to be tested and measuring the angle and the stress; a constant temperature water bath tank (7) used for simulating the real application environment of the blood vessel covered stent; and the platform bracket (8) is used for assembling, connecting and fixing the components. Compared with the prior art, the device can dynamically test the straightening force of the vascular graft stent, accurately reflects the support performance of the stent, has a simple device structure, small friction and small influence factor on an experimental result, and can simulate a real application environment.
Description
Technical Field
The utility model relates to the technical field of medical instruments, in particular to a test bench for testing the aligning force of a blood vessel covered stent.
Background
Aortic vascular diseases, particularly vascular dissections and hemangiomas, are a disease that seriously jeopardizes the life safety of patients. The aortic Aneurysm treatment method is widely used by endoluminal Repair (EVAR). Compared with the traditional surgical operation, the most prominent characteristic of the intracavity isolation operation is minimal invasion, and no operation wound of thoracotomy and abdominal opening and pathophysiology interference brought by blocking of the aorta are generated. The principle is as follows: the stent is covered with an autologous blood vessel, a biological material or a synthetic material artificial blood vessel, the covered stent is implanted into an aortic aneurysm cavity through a delivery system, the hemangioma is separated from blood flow, a new blood flow channel is reconstructed, and the hemangioma is reduced and organized after no blood flow exists, so that the treatment purpose is achieved. The EVAR has the characteristics of minimal invasion, high safety, low mortality, low morbidity and the like, the postoperative recovery of patients is fast, and more treatment opportunities are provided for the elderly and weak patients.
The blood vessel covered stent is a main body part for treating aneurysm and arterial dissection by endoluminal isolation, and is used for isolating a lesion section from normal blood flow, thereby avoiding serious consequences such as rupture of the aneurysm, hyperemia of the arterial dissection and rupture of blood vessels. When the vascular stent graft is placed at a vascular site having a large degree of bending in the human body, complications may occur due to the high rigidity of the vascular stent graft itself. When the StanfordB type aortic dissection occurs, one end of the blood vessel covered stent is usually required to be placed and fixed at the aortic arch with larger curvature, and clinical long-term results show that the blood vessel walls at the two ends of the blood vessel covered stent can generate new lacerations. The generation of the new laceration may be related to the state of the blood vessel covered stent in a bending state, and the bent blood vessel covered stent has the tendency of rebounding to a straightening state, and the straightening force which is vertically acted on the blood vessel wall is generated at the two ends of the bent blood vessel covered stent. In addition, in the process of the operation of the endoluminal exclusion treatment, when the vascular stent graft is delivered in the curved vascular system of the human body, the stent graft is required to have good bending performance, so that the operability of the operation can be improved, and the smooth operation can be ensured. Therefore, the stent graft is required to have excellent bending properties, and evaluation of both bending force and straightening force is essential.
The current straightening force of the blood vessel covered stent is found by consulting domestic and foreign documents and data, and the main work is to establish a finite element model to carry out numerical simulation or test static straightening force in vitro. However, the existing evaluation methods still have some problems. For example, the bending force and the straightening force of the covered stent are researched by adopting a finite element simulation method, a model needs to be established for the covered stent first, and certain mechanical properties are endowed to the material. Because the tectorial membrane stent is fixedly combined by the metal stent part and the fabric tectorial membrane part through the suture mode, the two parts are relatively fixed, but some relative displacement can be accompanied under the action of force, which is difficult to realize in finite element simulation. In addition, in order to obtain a relatively real data result, a structure and a mechanical model of a host blood vessel need to be established outside the covered stent, and calculation and simulation are performed in a solid-solid coupling mode, which greatly increases the calculation difficulty. In addition, the method for testing the straightening force in the prior art is usually performed statically at a specific angle, i.e. the stent covered with a film is artificially bent to a specific angle, and then the force value is measured by a dynamometer or other instruments. The testing method has the defects of poor testing stability, large influence by the surrounding environment and human factors and low efficiency. In the prior art, no report on the vascular literature data of the in vitro continuous dynamic test of the straightening force of the vascular stent graft exists, so that a dynamic test device for the straightening force of the vascular stent graft is urgently needed to overcome the defects.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a test bench for testing the straightening force of a blood vessel covered stent.
The purpose of the utility model can be realized by the following technical scheme: a blood vessel covered stent aligning force test experiment table comprises:
the fixing assembly is used for adjusting and fixing the to-be-detected vascular stent graft and comprises a balance rotating block, a U-shaped cantilever rod and a sliding block, wherein the to-be-detected vascular stent graft is connected with the balance rotating block, the balance rotating block is arranged on the U-shaped cantilever rod, and the U-shaped cantilever rod is connected with the sliding block;
the test assembly is used for bending the blood vessel covered stent to be tested and measuring the angle and stress, and comprises a sliding table, an angle scale and a dynamometer, wherein the sliding table is connected with the dynamometer, the other end of the dynamometer is connected with a U-shaped cantilever rod, and the angle scale is arranged on the U-shaped cantilever rod;
the constant-temperature water bath tank is used for simulating the real application environment of the blood vessel covered stent;
and the platform bracket is used for assembling, connecting and fixing the components.
Preferably, the sliding table is a double-track electric linear sliding table, the dynamometer is an electronic digital dynamometer, and the double-track electric linear sliding table can drive the electronic digital dynamometer to slowly move at a constant speed.
Preferably, the fixed component comprises 2U-shaped cantilever rods, each slider comprises a first slider and a second slider, the 2U-shaped cantilever rods are respectively arranged on the first slider and the second slider, each U-shaped cantilever rod is provided with 1 balance rotary block, and two ends of the to-be-tested vascular graft stent are respectively connected with the 1 balance rotary blocks.
Further preferably, a dowel bar is arranged on the U-shaped cantilever bar positioned at one end of the blood vessel covered stent to be tested, and the dowel bar is connected with a dynamometer.
Preferably, the balance rotary block is provided with a protruding structure, and the vascular graft stent to be tested is sleeved on the protruding structure.
Preferably, the balance rotating block structure is symmetrical. The balance rotary block has symmetrical structure and can balance the gravity of the balance rotary block.
Preferably, the balance rotating block is provided with a pointer for reading an angle. Preferably, the pointer should be as slim and light as possible to reduce relative error.
Preferably, the balance rotary block is provided with a through hole for allowing liquid in the constant-temperature water bath tank to freely enter and exit the blood vessel covered stent to be tested.
Preferably, the sliding block is arranged on the sliding rail, and the U-shaped cantilever rod realizes horizontal movement and fixation with the sliding rail through the sliding block. Preferably, the slide rail is a controllable slide rail fixed on the platform bracket. The controllable slide rail comprises an electric slide rail controlled by a controllable stepping motor to move.
Preferably, the U-shaped cantilever rod is provided with a graduated scale groove, and the angle graduated scale is embedded into the graduated scale groove.
Preferably, the U-shaped cantilever rod is provided with a through hole for connecting the balance rotary block, and the balance rotary block is connected with the U-shaped cantilever rod by using a bearing. Preferably, the bearings are as precise as possible to reduce friction, and ball bearings are optional.
Preferably, the constant temperature water bath box is a transparent controllable constant temperature water bath box with adjustable temperature. The highest water level of the constant-temperature water bath tank needs to completely submerge the covered stent to be detected.
Preferably, the balance rotary block is marked with a standard line for reference when the to-be-detected blood vessel covered stent is sleeved.
The utility model provides a blood vessel covered stent aligning force test experiment method, uses above-mentioned test experiment platform, specifically includes:
s1: zero setting in no-load mode, not placing the blood vessel covered stent to be tested, driving the dynamometer to move at a constant speed through the sliding table, testing and recording the reading of the dynamometer, and zero setting the dynamometer;
s2: placing a to-be-tested blood vessel covered stent, respectively sleeving two ends of the to-be-tested blood vessel covered stent on the balance rotary blocks, fixing the first slide block, driving the dynamometer to be close to the first slide block at a constant speed through the sliding table after the constant-temperature water bath tank is preheated by water injection, and driving the U-shaped cantilever rod and the balance rotary block to be close to the first slide block by the dynamometer to push the dowel rod to be close to the first slide block;
s3: bending the covered stent to be tested to a required degree, recording the reading of the dynamometer to obtain FMeasuringRecording the reading of the angle scale as theta;
s4: calculating the back straight force F of the blood vessel covered stent according to the following formulaGo back to：
In the formula, alpha is an included angle between a connecting line of a midpoint of a contact part of the blood vessel covered stent and the balance rotating block and a center line of the balance rotating block, and beta is a difference value between theta and alpha.
The utility model provides a test bench for testing the straightening force of a blood vessel covered stent, which is based on the defects that the existing test bench for testing the straightening force of the blood vessel covered stent cannot dynamically test the straightening force of the blood vessel covered stent, can only reflect the support performance of the stent laterally, has a complex equipment structure, has obvious friction and other factors which obviously influence the test result, cannot simulate a real application environment and the like.
Compared with the prior art, the utility model has the following advantages:
1. the test experiment table can dynamically test the straightening force of the blood vessel covered stent, accurately reflects the support performance of the stent, has a simple equipment structure, small friction and small influence factor on an experiment result, and can simulate a real application environment;
2. the fixing component and the testing component are matched, so that the covered stent of the blood vessel to be tested can be flexibly adjusted and fixed, and bending, angle and stress tests are performed, the operation is simple, the repeatability is strong, and the result is accurate;
3. the fixing assembly can be used for conveniently mounting, dismounting and testing the blood vessel covered stent to be tested through the matching design of the balance rotary block, the U-shaped cantilever rod and the sliding block, the balance rotary block is connected to the U-shaped cantilever rod through a bearing, the gravity of the balance rotary block is overcome through a symmetrical structure, the influence of liquid on the stent is eliminated through the through hole, the bending degree of the blood vessel covered stent to be tested can be accurately reflected, and the accuracy of the straightening force test is improved;
4. according to the utility model, through the arrangement of the protruding structures on the balance rotary block, the influence of the balance rotary block on the self performance of the blood vessel covered stent can be reduced to the maximum extent while the blood vessel covered stent to be tested is fixed, bent and the like, the supporting performance of the blood vessel covered stent can be accurately reflected, and the accuracy of an experimental result is improved;
5. the test assembly accurately tests the friction force between the sliding block and the sliding rail and the included angle between the central line of the balance rotary block and the horizontal plane through the matching design of the sliding table, the dynamometer and the angle scale ruler, so that the straightening force of the blood vessel covered stent can be obtained conveniently;
6. the constant temperature water bath box can simulate the real temperature and liquid environment of the blood vessel covered stent applied to the human body, so as to improve the accuracy of the experimental result.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the test bench of the present invention;
FIG. 2 is a schematic structural view of the test bench of the present invention without the constant temperature water bath tank;
FIG. 3 is a schematic structural view of a U-shaped cantilever bar;
FIG. 4 is a schematic structural diagram of a balancing rotating block;
FIG. 5 is a schematic view of the connection of the U-shaped cantilever bar and the balancing swivel;
FIG. 6 is a schematic diagram of the calculation formula derivation of the aligning force;
in the figure: 1-balance rotary block, 11-protrusion structure, 12-through hole, 2-U-shaped cantilever rod, 21-graduated scale groove, 3-sliding block, 31-first sliding block, 32-second sliding block, 4-sliding table, 5-angle graduated scale, 6-dynamometer, 7-constant temperature water bath tank, 8-platform support, 9-dowel bar, 10-sliding rail, 13-bearing, 100-vascular tectorial membrane support, A-midpoint of contact part of vascular tectorial membrane support 100 and balance rotary block 1, O-rotation center, and LL-center line of balance rotary block 1.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The following examples are carried out on the premise of the technical scheme of the utility model, and detailed embodiments and specific operation processes are given, but the scope of the utility model is not limited to the following examples.
Example 1
The utility model provides a blood vessel covered stent returns straight power test experiment platform, is shown in fig. 1 ~ 2, including electron digital display dynamometer 6, the electronic straight line slip table 4 of double-line rail, U-shaped cantilever bar 2, slide rail 10, slider 3, angle scale 5, balanced rotary block 1, platform support 8, dowel steel 9, constant temperature water bath 7, ball bearing 13.
As shown in fig. 1, after the platform support 8 is constructed, the platform support 8 is placed in the constant temperature water bath tank 7 to form a basic frame of the present embodiment, and the following components are assembled on the basic frame.
As shown in fig. 2 to 3, the blood vessel covered stent 100 to be measured is fixed by the left and right balance rotary blocks 1, a scale groove 21 is designed on the U-shaped cantilever bar 2, and an angle scale 5 is arranged in the groove. Two balanced swing blocks 1 set up respectively about on two U-shaped cantilever bar 2, slider 3 includes left first slider 31 and second slider 32, and left side U-shaped cantilever bar 2 is fixed on first slider 31, and right side U-shaped cantilever bar 2 is fixed on second slider 32, and slider 31 and 32 all set up on slide rail 10, and slide rail 10 is fixed on platform support 8. A dowel bar 9 is fixed at the top of the right U-shaped cantilever bar 2, a dynamometer 6 is connected on the right side of the dowel bar 9, and the dynamometer 6 is connected with the sliding table 4.
As shown in fig. 4, the balancing rotating block 1 is provided with a protruding structure 11 for the blood vessel covered stent 100 to be measured to be sleeved thereon, and for balancing the self gravity, the protruding structure 11 is symmetrically arranged at two sides of the balancing rotating block 1. The protruding structure 11 is further provided with a through hole 12 for allowing liquid in the constant temperature water bath tank 7 to freely enter and exit the blood vessel covered stent 100 to be tested.
As shown in fig. 5, the U-shaped cantilever bar 2 and the balance knob 1 are connected by a ball bearing 13.
An experimental method for testing the straightening force of a blood vessel covered stent specifically comprises the following steps:
s1: zero setting in no-load mode, when the blood vessel covered stent 100 to be tested is not placed, the electronic digital display dynamometer 6 is driven to slowly move at a uniform speed through the double-line rail electric linear sliding table 4, the friction force generated by contact between the sliding block 32 and the sliding rail 10 is tested and recorded, and zero setting of the dynamometer is finished.
S2: placing a blood vessel covered stent 100 to be tested, respectively sleeving the two ends of the blood vessel covered stent 100 to be tested on the protruding structures 11 of the left balance rotating block 1 and the right balance rotating block 1, fixing a first sliding block 31, controlling the double-linear-rail electric linear sliding table 4 to slowly move leftwards at a constant speed after water injection preheating of the constant-temperature water bath tank 7, driving the electronic digital dynamometer 6 to push the dowel bar 9 and the U-shaped cantilever bar 2 at the bottom of the dowel bar and the corresponding balance rotating block 1 to bend the blood vessel covered stent 100 to a required degree, and recording the reading F of the electronic digital dynamometer 6MeasuringAnd the reading angle θ of the angle scale 5, and according to the functional formula:
further calculating the back-straightening force F of the bracketGo back toThereby judging the compliance of the blood vessel stent.
Wherein β ═ θ - α. As shown in fig. 6, θ is an angle between the central line LL of the balance rotating block 1 and the horizontal plane, and α is an angle between the connecting line of the midpoint a and the rotation center O of the contact part of the stent graft 100 and the balance rotating block 1 and the central line LL of the balance rotating block 1.
Example 2
A blood vessel covered stent aligning force test experiment table is characterized in that a standard line for reference when a blood vessel covered stent 100 to be tested is sleeved is marked on a balance rotary block 1. The standard line is used for determining the sheathing depth of the blood vessel covered stent 100 to be tested in each experiment (namely the length of the contact part of the blood vessel covered stent 100 and the balance rotary block 1) so as to determine the position of the contact midpoint A of the blood vessel covered stent 100 to be tested and the balance rotary block 1 in calculation formula derivation, thereby determining the included angle alpha between the connection line of the contact midpoint A of the stent and the balance rotary block and the rotation center O and the central line LL of the balance rotary block and achieving the purpose of simplifying the experiment steps. The rest of the structure is the same as in example 1.
A blood vessel covered stent straightening force test experimental method is characterized in that when a blood vessel covered stent 100 is placed, two ends of the blood vessel covered stent 100 to be tested are respectively sleeved on protruding structures 11 of a left balance rotating block 1 and a right balance rotating block 1, and the edge of the blood vessel covered stent 100 to be tested is aligned with a standard line on the balance rotating blocks 1. The rest of the procedure was the same as in example 1.
The embodiments described above are intended to facilitate the understanding and use of the utility model by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides a blood vessel covered stent aligning force test experiment platform which characterized in that includes:
the fixing assembly for adjusting and fixing the to-be-detected blood vessel covered stent comprises a balance rotating block (1), a U-shaped cantilever rod (2) and a sliding block (3), wherein the to-be-detected blood vessel covered stent is connected with the balance rotating block (1), the balance rotating block (1) is arranged on the U-shaped cantilever rod (2), and the U-shaped cantilever rod (2) is connected with the sliding block (3);
the test assembly for bending the covered stent of the blood vessel to be tested and measuring the angle and stress comprises a sliding table (4), an angle scale (5) and a dynamometer (6), wherein the sliding table (4) is connected with the dynamometer (6), the other end of the dynamometer (6) is connected with a U-shaped cantilever rod (2), and the angle scale (5) is arranged on the U-shaped cantilever rod (2);
a constant temperature water bath tank (7) used for simulating the real application environment of the blood vessel covered stent;
and the platform bracket (8) is used for assembling, connecting and fixing the components.
2. The test bench for testing the blood vessel covered stent straightening force according to claim 1, characterized in that the fixing component comprises 2U-shaped cantilever rods (2), the sliding block (3) comprises a first sliding block (31) and a second sliding block (32), the 2U-shaped cantilever rods (2) are respectively arranged on the first sliding block (31) and the second sliding block (32), each U-shaped cantilever rod (2) is provided with 1 balancing rotary block (1), and two ends of the blood vessel covered stent to be tested are respectively connected with 1 balancing rotary block (1).
3. The test bench for testing the blood vessel covered stent straightening force according to claim 2, characterized in that a dowel bar (9) is arranged on the U-shaped cantilever bar (2) at one end of the blood vessel covered stent to be tested, and the dowel bar (9) is connected with a dynamometer (6).
4. The test bench for testing the aligning force of the blood vessel covered stent according to claim 1, wherein the balance rotary block (1) is provided with a protrusion structure (11), and the blood vessel covered stent to be tested is sleeved on the protrusion structure (11).
5. The test bench for testing the aligning force of the blood vessel covered stent according to claim 1, wherein the balance rotary block (1) has a symmetrical structure.
6. The test bench for testing the aligning force of the blood vessel covered stent according to claim 1, wherein the balance rotary block (1) is provided with a pointer for reading an angle.
7. The test bench for testing the aligning force of the vascular stent graft according to claim 1, wherein the balance rotary block (1) is provided with a through hole (12) for allowing liquid in the constant temperature water bath tank (7) to freely enter and exit the vascular stent graft to be tested.
8. The test bench for testing the blood vessel covered stent straightening force according to claim 1, characterized in that the sliding block (3) is arranged on the sliding rail (10), and the U-shaped cantilever rod (2) realizes horizontal movement and fixation through the sliding block (3) and the sliding rail (10).
9. The test bench for testing the blood vessel covered stent straightening force according to claim 1, characterized in that a graduated scale groove (21) is arranged on the U-shaped cantilever rod (2), and the angle graduated scale (5) is embedded in the graduated scale groove (21).
10. The test bench for testing the blood vessel covered stent straightening force according to claim 1, characterized in that the U-shaped cantilever rod (2) is provided with a through hole for connecting the balance rotary block (1), and the balance rotary block (1) is connected with the U-shaped cantilever rod (2) by a bearing (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121676693.8U CN215677862U (en) | 2021-07-22 | 2021-07-22 | Blood vessel covered stent aligning force test experiment platform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121676693.8U CN215677862U (en) | 2021-07-22 | 2021-07-22 | Blood vessel covered stent aligning force test experiment platform |
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| Publication Number | Publication Date |
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| CN215677862U true CN215677862U (en) | 2022-01-28 |
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| CN202121676693.8U Active CN215677862U (en) | 2021-07-22 | 2021-07-22 | Blood vessel covered stent aligning force test experiment platform |
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2021
- 2021-07-22 CN CN202121676693.8U patent/CN215677862U/en active Active
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