Intravascular stent structure capable of reducing pressure stress

Abstract

The utility model relates to the technical field of medical instruments, and discloses an intravascular stent structure capable of reducing pressure stress, the intravascular stent is of a tubular net rack structure and comprises a plurality of annular wave rods and stent connecting rods, the annular wave rods are arranged in the axial direction of the intravascular stent, a plurality of stent connecting rods are arranged on one side of each wave rod, and the stent connecting rods are arranged on the other side of each wave rod. One end of each support connecting rod is connected with an adjacent wave rod, the section of each wave rod is arranged in a wave shape, and the support is characterized in that no less than one group of pressure stress parts capable of reducing the pressure stress of the wave rods are arranged on the side surfaces of the wave rods; due to the design of the wave-shaped wave rods and the pressure stress part, the support has more elastic deformation space, when the support is stressed, the support can elastically deform to a certain degree at the fluctuation of waves and the bending part of the pressure stress part instead of directly bearing all the pressure like a rigid structure, and the elastic deformation absorbs part of the pressure, so that the stress resistance of the support is improved. Therefore, the pressure stress is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially relates to a kind of blood vessel stent structures of reducing stress. BACKGROUND

[0002] Current cardiovascular disease has been the first killer of human health. Such as blood vessel stent and the like vascular prosthesis is widely used in the treatment of various vascular access abnormalities (angioma, dissection, embolism, stenosis, etc.).

[0003] In the Chinese utility model patent with the announcement number CN217593159U discloses blood vessel stent, the above prior art, although reduce the continuous damage caused by the end position anchoring blood vessel after blood vessel stent is implanted into blood vessel, reduce the occurrence probability of vascular marginal stenosis, but when blood vessel stent is used, need to be pressed first, so that blood vessel stent is folded under pressure, facilitate blood vessel stent moves to lesion along blood vessel;When blood vessel stent reaches lesion, it is opened again, to play the role of supporting blood vessel wall, due to the material and structure of blood vessel stent, it requires that the stress of blood vessel stent everywhere should be uniform and stable, excessive stress can cause stent deformation, for example, the stent wire of stent can be bent or broken, once stent is deformed, its support to blood vessel wall will be uneven, local blood vessel can not be supported enough and narrow again, simultaneously, deformed stent can also damage blood vessel wall, induce serious complications such as intravascular hemorrhage, therefore, it is necessary to design a kind of blood vessel stent capable of reducing stress. SUMMARY

[0004] To solve the above technical problems, the utility model provides a kind of blood vessel stent structure of reducing stress.

[0005] The utility model adopts the following technical scheme to realize: a kind of blood vessel stent structure of reducing stress, the blood vessel stent is tubular net rack structure, including wave pole and stent connecting rod, a plurality of annular wave poles are arranged in the axial direction of blood vessel stent, a plurality of stent connecting rods are arranged on the side of each wave pole, one end of the stent connecting rod is connected with adjacent wave pole, the cross section of the wave pole is arranged in the shape of wave, characterized by, at least one group of stress reduction parts capable of reducing the stress of wave pole is arranged on the side of wave pole.

[0006] Through the above technical scheme, the wave pole arranged in the shape of wave can well buffer the stress received by blood vessel stent unit, and the stress reduction part is arranged on the wave pole, so that the stress can be reduced when blood vessel stent is subjected to stress.

[0007] As a further improvement of the above scheme, the stress reduction part is a groove recessed inwardly of the blood vessel stent or a peak protruding outwardly of the blood vessel stent.

[0008] By setting the groove or convex stress part, when the vascular stent is pressed or expanded, the structure of the stress part can effectively disperse the stress and prevent the vascular stent from deforming.

[0009] As a further improvement of the above scheme, the stress parts of several groups are arranged in a wave shape, and the wave amplitude is 0°-180°.

[0010] Through the above technical scheme, the range of the amplitude can prevent the wave rod from breaking during expansion, ensure that the vascular stent has sufficient mechanical properties in the diseased blood vessel, and improve the stress concentration problem of the vascular stent during compression and expansion, reduce the damage of compression and expansion to the vascular stent, and prolong the service life of the vascular stent.

[0011] As a further improvement of the above scheme, the width of the stress part is 100-200μm.

[0012] Through the above technical scheme, the width range can ensure that the vascular stent has sufficient contact area on the blood vessel wall, and the wider vascular stent can provide relatively larger support force, which can effectively resist the retraction pressure of the blood vessel wall.

[0013] As a further improvement of the above scheme, the thickness of the stress part is 90-200μm.

[0014] Through the above technical scheme, the vascular stent needs to bear the pressure of the blood vessel wall, and the thickness between 90μm-200μm can ensure that the vascular stent has sufficient mechanical strength, and the thicker vascular stent can better resist the elastic retraction force of the blood vessel.

[0015] As a further improvement of the above scheme, the stress part is any one of a circular arc, an ellipse, a tooth shape, and a rhombus.

[0016] Through the above technical scheme, different shapes of stress parts can be set according to the material, structure or application scene of the vascular stent, which can reduce the stress on the vascular stent and improve the stability of the vascular stent.

[0017] As a further improvement of the above scheme, the wave top of the wave rod is provided with a reinforcing plate.

[0018] Through the above technical scheme, the reinforcing plate can improve the strength of the wave rod when the wave rod is subjected to stress, improve the weakening of the mechanical strength of the wave rod caused by the setting of the stress part, and improve the mechanical properties of the wave rod.

[0019] Compared with the prior art, the beneficial effects of the present application are as follows:

[0020] The utility model discloses a wave pole and the stress part of setting on the wave pole are set up through the wave shape, and the design of wave shape and stress part makes the vascular stent have more elastic deformation space, when receiving pressure, the stent can carry out a certain degree of elastic deformation in the fluctuation of wave and the bending part of stress part, and not like rigid structure directly bears all pressure, and this elastic deformation absorbs part of pressure, thereby reduce the stress. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is three-dimensional structure schematic diagram of the utility model;

[0022] Figure 2 It is structure schematic diagram of the utility model with wave pole;

[0023] Figure 3 It is the utility model Figure 2 A part structure enlarged view.

[0024] Main symbol explanation:

[0025] 1, wave pole;2, stent connecting rod;3, stress part;4, reinforcing plate. DETAILED DESCRIPTION

[0026] Below, combining the drawings and specific embodiment, the utility model is described further, need explaining, under the premise of not conflicting, the following described each embodiment or each technical feature between can be any combination and form new embodiment.

[0027] Reference Figures 1-3 , a vascular stent structure of reducing stress of the embodiment, the vascular stent is tubular net rack structure, including wave pole 1 and stent connecting rod 2, multiple annular wave poles 1 are arranged in the axial direction of vascular stent, and multiple stent connecting rods 2 are arranged on one side of each wave pole 1, one end of the stent connecting rod 2 is connected with the adjacent wave pole 1, the cross section of wave pole 1 is arranged in the wave shape, and the side surface of wave pole 1 is provided with not less than one group of stress part 3;Wave pole 1 arranged in the wave shape can well buffer the stress of vascular stent, and stress part 3 can reduce stress when wave pole 1 receives stress.

[0028] The stress part 3 in the scheme is the groove body recessed to the vascular stent or the peak body protruding to the vascular stent, in specific implementation, several groups of stress part 3 can be locally arranged on the side surface of wave pole 1, or can be arranged on the side surface of entire wave pole 1, the shape of stress part 3 can be arranged as circular arc, oval, tooth, rhombus, etc., and in specific application, the shape of several groups of stress part 3 can be arranged as single shape, or can be arranged as different shape combination.

[0029] Reference Figures 1-3The plurality of compressive stress portions 3 are arranged in a wave shape, and the wave amplitude is 0°-180°, which can prevent the wave rod 1 from being broken during expansion, ensure that the vascular stent has sufficient mechanical properties in the diseased blood vessel, improve the stress concentration of the vascular stent during crimping and expansion, reduce the damage of crimping and expansion to the vascular stent, and prolong the service life of the vascular stent.

[0030] The width of the compressive stress portion 3 is 100-200 μm, which can ensure that the vascular stent has sufficient contact area on the blood vessel wall, and a wider vascular stent can provide relatively larger support force to effectively resist the retraction pressure of the blood vessel wall; the thickness of the compressive stress portion 3 is 90-200 μm, and the vascular stent needs to bear the pressure of the blood vessel wall, and the thickness of 90-200 μm can ensure that the vascular stent has sufficient mechanical strength, and a thicker vascular stent can better resist the elastic retraction force of the blood vessel.

[0031] In combination with the accompanying drawings Figure 3 The wave top of the wave rod 1 is provided with a reinforcing plate 4, which can improve the strength of the wave rod 1 when the wave rod 1 is subjected to compressive stress, improve the weakening of the mechanical strength of the wave rod 1 caused by the arrangement of the compressive stress portion 3, and improve the mechanical properties of the wave rod 1.

[0032] The implementation principle of the vascular stent structure capable of reducing compressive stress in the embodiment is as follows: before using the vascular stent, the vascular stent is first installed on the balloon, and the vascular stent is crimped on the inflatable balloon of the stent catheter through the crimping process, which facilitates the introduction of the vascular stent into the blood vessel. When crimping, the wave-shaped structure and the compressive stress portion 3 can disperse the concentrated pressure to a larger area, so that the vascular stent will not be damaged, the crimping force on the vascular stent is more uniform and stable, and the quality of the stent is improved; when the vascular stent and the balloon reach the lesion, physiological saline is injected into the balloon, the balloon is inflated to support the vascular stent and support the blood vessel wall, and then the physiological saline is extracted, the balloon is contracted and separated from the vascular stent, and the balloon is taken out.

[0033] When the blood vessel exerts pressure on the wave rod 1, the wave-shaped structure and the compressive stress portion 3 can disperse the concentrated pressure to a larger area, for example, when a flat structure is subjected to vertical pressure, the pressure is concentrated near the contact point, while the wave-shaped structure is like a series of small arches, and the pressure is dispersed along the arc of the arch to both sides; the compressive stress portion 3 can also guide the pressure to be distributed along the curve direction of the groove, so as to avoid excessive accumulation of pressure in a local area.

[0034] Meanwhile, when the wave rod 1 is subjected to compressive stress, the reinforcing plate 4 will also be subjected to pressure and flattened, which can relieve the pressure during the flattening process, thereby reducing the force on the wave rod 1.

[0035] And the lower compressive stress can reduce the risk of structural damage of the wave rod 1 itself due to long-term bearing of excessive pressure. The pressure in the blood vessel is persistent and dynamically changes with factors such as the beating of the heart, the movement of the body, etc. If the compressive stress is too high, the stent may fatigue and break, deform, etc. The present scheme reduces the stress deformation, fatigue and other problems of the stent by reducing the compressive stress of the wave rod 1, prolongs the service life of the stent, and ensures its long-term stable function in the blood vessel.

[0036] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A vascular stent structure capable of reducing compressive stress, wherein the vascular stent is a tubular mesh structure comprising wave rods (1) and stent connecting rods (2), wherein multiple annular wave rods (1) are arranged axially along the vascular stent, and multiple stent connecting rods (2) are provided on one side of each wave rod (1), one end of each stent connecting rod (2) is connected to an adjacent wave rod (1), and the cross-section of the wave rod (1) is wavy, characterized in that, The side of the wave rod (1) is provided with at least one set of compressive stress parts (3) that can reduce the compressive stress of the wave rod (1).

2. The vascular stent structure for reducing compressive stress as described in claim 1, characterized in that, The compressive stress part (3) is a groove that is recessed into the vascular stent or a peak that protrudes outward from the vascular stent.

3. The vascular stent structure for reducing compressive stress as described in claim 2, characterized in that, Several sets of the compressive stress parts (3) are arranged in a wave shape with a waveform arc of 0°-180°.

4. The vascular stent structure for reducing compressive stress as described in claim 3, characterized in that, The width of the compressive stress section (3) is 100μm-200μm.

5. A vascular stent structure capable of reducing compressive stress as described in claim 3, characterized in that, The thickness of the compressive stress part (3) is 90μm-200μm.

6. A vascular stent structure capable of reducing compressive stress as described in claim 2, characterized in that, The compressive stress part (3) can be any one of the following: arc shape, ellipse shape, tooth shape, or rhombus shape.

7. A vascular stent structure capable of reducing compressive stress as described in claim 3, characterized in that, The wave crest of the wave rod (1) is provided with a reinforcing plate (4).

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