Testing assembly for rupture strength of vascular implant

Abstract

The utility model provides an assembly for testing rupture strength of a vascular implant, which is arranged on a universal stretcher and comprises a clamping and fixing assembly, the clamping and fixing assembly comprises a driving part, a lower pressing plate, an O-shaped ring and an upper pressing plate, the driving part is arranged on the universal stretcher, the lower pressing plate is arranged at the output end of the driving part, a positioning hole is formed in the lower pressing plate, and the O-shaped ring is arranged in the positioning hole; the upper pressing plate is fixedly arranged on the driving part through a plurality of supporting rods, a pressed hole is formed in the position, corresponding to the positioning hole, of the upper pressing plate, the bursting assembly comprises a mounting rod and a bursting rod, the mounting rod is arranged on the universal stretching machine, one end of the bursting rod is connected with the mounting rod, a ball is arranged at the other end of the bursting rod, and the ball is located over the pressed hole. The lower pressing plate can be driven by the driving piece to be matched with the upper pressing plate to clamp and fix the blood vessel implant, so that the clamping plate is prevented from being manually adjusted and fastened, the problem that the blood vessel implant (film) is not tightly clamped is solved, and the testing efficiency and the testing accuracy are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument detection technical field, concretely relates to a test assembly for blood vessel implant breakage strength. BACKGROUND

[0002] In the technical field of blood vessel implants, enterprises related to the production or use of blood vessel implants (membranes) in China generally use bursting devices or equipment to test the breakage strength of blood vessel implants (membranes), so as to ensure that the produced or used blood vessel implants (membranes) are all qualified products.

[0003] At present, the existing bursting devices or equipment on the market are generally bursting devices designed based on stretching machines or independently designed bursting devices. However, the existing bursting devices designed based on stretching machines have the following testing shortcomings: 1. The diameters of the bursting ball head and the bursting clamping hole do not meet the requirements of YY / T0500 "Cardiovascular Implant Vascular Prosthesis Tubular Vascular Graft and Vascular Patch"; 2. The clamping tool is not tight enough, which causes the membrane to be partially ejected during testing, resulting in inaccurate test data; 3. Clamping is not convenient and needs to be manually tightened. The independently designed bursting equipment is also relatively high in cost, so the existing technology has limitations. SUMMARY

[0004] The utility model is carried out in order to solve the above problems, and aims at providing a test assembly for blood vessel implant breakage strength.

[0005] The utility model provides a test assembly for blood vessel implant breakage strength, is located in the universal stretching machine, the universal stretching machine at least has upper die holder and lower die holder, upper die holder and lower die holder at least one can move up and down, so that the universal stretching machine can carry out the performance test of stretching, compression, bending, peeling or shearing to test material, have such characteristics, including:

[0006] The clamping and fixing assembly includes a driving member, a lower pressing plate, an O-ring, and an upper pressing plate. The driving member is arranged on the lower die holder, and the output end of the driving member faces the upper die holder. The lower pressing plate is in the shape of a round cake and is arranged on the output end of the driving member. A positioning hole is formed in the inner part of the lower pressing plate along its axis. An annular groove is formed in the upper end surface of the lower pressing plate and located at the outer periphery of the positioning hole. The O-ring is arranged in the annular groove. The upper pressing plate is in the shape of a round cake and is fixedly arranged on the driving member by a plurality of supporting rods. A pressure receiving hole is formed in the upper pressing plate and corresponds to the positioning hole.

[0007] The bursting assembly includes a mounting rod and a bursting rod. One end of the mounting rod is connected to the mounting rod, and the other end is provided with a ball. The ball is located directly above the pressure receiving hole.

[0008] In the test assembly mechanism for the rupture strength of the vascular implant, the installation rod is internally provided with an installation groove along the axis thereof, the side wall of the installation rod is provided with a locking hole in communication with the installation groove, the locking hole is internally provided with a locking piece, and the inner wall of the locking hole and the outer wall of the locking piece are respectively provided with internal threads and external threads which are mutually engaged, so that the installation rod can be installed on the upper die seat.

[0009] In the test assembly mechanism for the rupture strength of the vascular implant, the upper plate surface of the lower pressing plate and the lower plate surface of the upper pressing plate are both frosted surfaces.

[0010] In the test assembly mechanism for the rupture strength of the vascular implant, the diameter of the positioning hole is not less than the diameter of the pressure receiving hole.

[0011] In the test assembly mechanism for the rupture strength of the vascular implant, the diameter of the pressure receiving hole is 11.3 mm, and the diameter of the ball head is 9.5 mm.

[0012] In the test assembly mechanism for the rupture strength of the vascular implant, the lower end edge of the pressure receiving hole and the upper end edge of the positioning hole are both provided with chamfers.

[0013] In the test assembly mechanism for the rupture strength of the vascular implant, the driving piece is an electric push rod.

[0014] Effects of the utility model

[0015] According to the test assembly mechanism for the rupture strength of the vascular implant, the lower pressing plate can be driven by the driving piece to cooperate with the upper pressing plate to clamp and fix the vascular implant (membrane), and the O-shaped ring arranged on the lower pressing plate can further press and fix the vascular implant (membrane), so that manual adjustment of the fastening clamping plate is avoided, and the problem of insufficient tightness of the clamping of the vascular implant (membrane) is avoided, thereby improving the efficiency and accuracy of the test, and guaranteeing the practical effect of the utility model in use. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the test assembly for the rupture strength of the vascular implant.

[0017] MARK NUMBER EXPLANATION:

[0018] 1, drive; 2, lower pressing plate; 21, positioning hole; 22, annular groove; 3, O-ring; 4, upper pressing plate; 41, pressure receiving hole;

[0019] 5, support rod; 6, mounting rod; 61, mounting groove; 62, locking hole; 63, locking piece; 7, bursting rod; 8, spherical ball. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the following embodiments will be described in detail in combination with the drawings.

[0021] EMBODIMENT

[0022] Figure 1 is a structural schematic diagram of the utility model.

[0023] As Figure 1 shown, the embodiment provides a test assembly for blood vessel implant rupture strength, which is arranged on a universal tensile testing machine (not shown in the figure), and the universal tensile testing machine at least has an upper die holder and a lower die holder. The upper die holder and the lower die holder at least have one capable of moving up and down, so that the universal tensile testing machine can perform performance tests such as stretching, compression, bending, peeling, or shearing on test materials. The test assembly comprises a clamping and fixing assembly and a bursting assembly.

[0024] Among them, the universal tensile testing machine is a large-scale precision testing instrument commonly used in the prior art, which fully utilizes the respective specialties of electromechanical devices and constitutes a universal tensile testing machine capable of performing multiple performance tests such as stretching, compression, bending, peeling, and shearing on various materials. In the embodiment, the upper die holder is preferably capable of moving up and down on the universal tensile testing machine. In the embodiment, the upper die holder is provided with at least one mounting rod for facilitating installation of the bursting assembly.

[0025] As Figure 1 shown, the clamping and fixing assembly comprises a drive 1, a lower pressing plate 2, an O-ring 3, and an upper pressing plate 4. The drive 1 is arranged on the lower die holder, and the output end of the drive 1 faces the upper die holder. The lower pressing plate 2 is in the shape of a circular cake and is arranged on the output end of the drive 1. The lower pressing plate 2 has a positioning hole 21 in the interior thereof along the axis. The upper end surface of the lower pressing plate 2 and the outer periphery of the positioning hole 21 are provided with an annular groove 22. The O-ring 3 is arranged in the annular groove 22. The upper pressing plate 4 is in the shape of a circular cake and is fixed to the drive 1 by a plurality of support rods 5. The upper pressing plate 4 is provided with a pressure receiving hole 41 at a position corresponding to the positioning hole 21.

[0026] In the embodiment, the diameter of the O-ring 3 is 2.5 mm, and the distance between the annular groove 22 and the positioning hole 21 is 1 mm. The height of the O-ring 3 is higher than the depth of the annular groove 22.

[0027] In the embodiment, the upper plate surface of the lower pressing plate 2 and the lower plate surface of the upper pressing plate 4 are both frosted surfaces.

[0028] In the embodiment, the diameter of the positioning hole 21 is not less than the diameter of the pressure receiving hole 41.

[0029] In the embodiment, the diameter of the pressure receiving hole 41 is 11.3 mm.

[0030] In the embodiment, the lower end edge of the pressure receiving hole 41 and the upper end edge of the positioning hole 21 are both chamfered.

[0031] In the embodiment, the driving member 1 is preferably an electric push rod.

[0032] As shown in Figure 1 the puncturing assembly includes a mounting rod 6 and a puncturing rod 7, the mounting rod 6 is arranged on the upper die holder, one end of the puncturing rod 7 is connected with the mounting rod 6, and the other end of the puncturing rod 7 is provided with a spherical ball 8, which is located directly above the pressure receiving hole 41.

[0033] In the embodiment, the mounting rod 6 is internally provided with a mounting groove 61 along its axis, the side wall of the mounting rod 6 is provided with a locking hole 62 communicating with the mounting groove 61, the locking hole 62 is internally provided with a locking member 63, and the inner wall of the locking hole 62 and the outer wall of the locking member 63 are respectively provided with internal threads and external threads which are engaged with each other, so that the mounting rod 6 can be mounted on the upper die holder.

[0034] In the embodiment, the diameter of the spherical head is 9.5 mm.

[0035] When the blood vessel implant (membrane) is tested for rupture strength by using the utility model, first, the blood vessel implant (membrane) sample is placed on the lower pressing plate 2 and above the positioning hole 21. Then, the driving part 1 is operated to drive the lower pressing plate 2 to move upwards until the lower pressing plate 2 cooperates with the upper pressing plate 4 to clamp and fix the blood vessel implant (membrane). At this time, because the upper plate surface of the lower pressing plate 2 and the lower plate surface of the upper pressing plate 4 are both frosted surfaces, the friction between the blood vessel implant (membrane) and the upper pressing plate 4 and the lower pressing plate 2 is greatly enhanced, so that the blood vessel implant (membrane) will not be pulled out after being pressed tightly, thereby preliminarily enhancing the clamping and fixing effect of the upper pressing plate 4 and the lower pressing plate 2 on the blood vessel implant (membrane). Moreover, because the upper end surface of the lower pressing plate 2 and the outer periphery of the positioning hole 21 are provided with the annular groove 22, and the O-shaped ring 3 is arranged in the annular groove 22, when the upper pressing plate 4 cooperates with the lower pressing plate 2 to clamp and fix the blood vessel implant (membrane), the O-shaped ring 3 will be deformed under pressure, thereby further enhancing the clamping and fixing effect of the blood vessel implant (membrane) in the O-shaped ring 3. Therefore, the utility model can solve the problem of manually adjusting the upper pressing plate 4 and the lower pressing plate 2, thereby improving the testing efficiency; at the same time, it can also ensure the clamping and fixing effect of the upper pressing plate 4 and the lower pressing plate 2 on the blood vessel implant (membrane), so that the blood vessel implant (membrane) will not move during testing, thereby ensuring the accuracy of the test results.

[0036] Finally, the bursting program is selected on the universal tensile testing machine, and the moving speed of the bursting assembly and the like is set, so that the mounting rod 6 and the bursting rod 7 are driven by the upper die seat to move downwards, thereby the ball head on the other end of the bursting rod 7 is completely burst from top to bottom to reset after the blood vessel implant (membrane) sample is completely burst, and the work of testing the rupture strength of the blood vessel implant (membrane) is completed. At this time, because the diameter of the pressure receiving hole 41 is 11.3mm and the diameter of the ball head is 9.5mm, the requirement of YY / T0500 "Cardiovascular Implant Vascular Prosthesis Tubular Vascular Graft and Vascular Patch" is met, thereby further improving the accuracy of the test results. Moreover, because the lower end edge of the pressure receiving hole 41 and the upper end edge of the positioning hole 21 are both provided with chamfers, the blood vessel implant (membrane) sample is not easy to tear when the ball 8 bursts, thereby the practical effect of the utility model in use is reflected and ensured from the side.

[0037] Effects of the embodiment

[0038] The utility model relates to a kind of test assembly mechanism for blood vessel implant rupture strength, to be able to cooperate with upper pressing plate to the blood vessel implant (membrane) is clamped and fixed by the driving of lower pressing plate under the drive element, and the O-ring set on lower pressing plate can further be pressed tightly fixed to the blood vessel implant (membrane), so as to avoid artificial adjustment fastening clamping plate, and avoid the problem that the blood vessel implant (membrane) is not enough tightness clamped, so the efficiency of test and the accuracy of test are improved, to guarantee the practical effect of the utility model when using.

[0039] The above embodiment is a preferred case of the utility model and does not limit the protection scope of the utility model.

Claims

1. A testing assembly for the rupture strength of vascular implants, mounted on a universal tensile testing machine, the universal tensile testing machine having at least an upper die holder and a lower die holder, at least one of the upper die holder and the lower die holder being capable of vertical movement, thereby enabling the universal tensile testing machine to perform tensile, compression, bending, peeling, or shear performance tests on test materials, characterized in that, The test assembly comprises a clamping and fixing assembly, a breaking assembly and a test assembly. The clamping and fixing assembly comprises a driving member, a lower pressing plate, an O-shaped ring and an upper pressing plate. The driving member is arranged on the lower die seat, and the output end of the driving member faces the upper die seat. The lower pressing plate is in the shape of a round cake and is arranged on the output end of the driving member. The inside of the lower pressing plate and along the axis thereof is provided with a positioning hole. The upper end surface of the lower pressing plate and at the outer periphery of the positioning hole is provided with an annular groove. The O-shaped ring is arranged in the annular groove. The upper pressing plate is in the shape of a round cake and is fixedly arranged on the driving member through a plurality of supporting rods. The upper pressing plate and at the position corresponding to the positioning hole is provided with a pressure receiving hole. The breaking assembly comprises a mounting rod and a breaking rod. One end of the breaking rod is connected with the mounting rod, and the other end of the breaking rod is provided with a spherical ball. The spherical ball is located directly above the pressure receiving hole.

2. The test assembly for the rupture strength of a vascular implant according to claim 1, wherein: wherein The inside of the mounting rod and along the axis thereof is provided with a mounting groove. The side wall of the mounting rod is provided with a locking hole in communication with the mounting groove. The locking hole is provided with a locking member. The inner wall of the locking hole and the outer wall of the locking member are respectively provided with internal threads and external threads which are in engagement with each other, so that the mounting rod can be mounted on the upper die seat.

3. The test assembly for the rupture strength of a vascular implant according to claim 1, wherein: wherein The upper plate surface of the lower pressing plate and the lower plate surface of the upper pressing plate are both frosted surfaces.

4. The test assembly for the rupture strength of a vascular implant according to claim 1, wherein: wherein The diameter of the positioning hole is not less than the diameter of the pressure receiving hole.

5. The test assembly for the rupture strength of a vascular implant according to claim 1, wherein: wherein, The diameter of the pressure receiving hole is 11.3 mm, and the diameter of the spherical head is 9.5 mm.

6. The test assembly for the rupture strength of a vascular implant according to claim 1, wherein: wherein The lower end edge of the pressure receiving hole and the upper end edge of the positioning hole are both provided with chamfers.

7. The test assembly for the rupture strength of a vascular implant according to claim 1, wherein: wherein The driving member is an electric push rod.

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