Novel dense net support and use mode

Abstract

The invention provides a novel dense net bracket and a use mode. The novel dense net bracket comprises an outer bracket and an inner bracket, the outer support is provided with a first dense net area, and first transition areas are woven at the two ends of the first dense net area in sequence. The inner support is provided with a second dense net area, second transition areas are woven at the two ends of the second dense net area in sequence, second end areas are woven at one ends of the second transition areas in sequence, and plugging blocks are distributed on one side of the inner support at equal intervals and integrally formed. The blocking block of the inner stent is arranged to block the local first dense net area of the outer stent, so that the blocking part is in contact with the crevasse, the primary crevasse impacted by high-pressure blood flow can be immediately blocked after installation, magnesium alloy is used as a stent base, and the radial supporting force is enhanced; the first end area is arranged to be matched with the second end area to achieve the anchoring effect and prevent dislocation of the support, the arc-shaped part is arranged to enhance the initial anchoring effect, and the protruding part and the arc-shaped part are clamped to prevent the inner support from being dislocated and disengaged from the outer support.

Description

Technical Field

[0001] The present invention relates to the technical field of vascular stents, and in particular to a novel dense mesh stent and a use method thereof. Background Art

[0002] The multilayer dense mesh stent system, also known as the blood flow regulator (MFM), is a three-dimensional structure stent woven from a double-layer bare metal stent. Its porosity is controlled by multi-layer weaving. It was first used in the treatment of renal artery aneurysms. The stent regulates blood flow in the lumen, reduces arterial wall stress, promotes positive remodeling of the arterial lumen, accelerates thrombosis in the tumor, and then shrinks the tumor. The early computational fluid dynamics and animal experiments of MFM have shown encouraging results. It has been introduced into the fields of abdominal aortic aneurysm and aortic dissection. The results reported in the literature are different and generally unsatisfactory. In addition, due to the difficulty of secondary surgery after implantation failure, the application of this technology tends to be reduced. The reasons for the failure of this technology are summarized as follows: 1. Due to the limitation of porosity, MFM cannot immediately block the primary rupture of high-pressure blood flow impact, which is the primary purpose of primary repair of AAD; 2. The radial support force of the first-generation MFM is not enough to effectively expand the true lumen of the aorta in patients with chronic residual dissection, and the remaining large distal rupture maintains the perfusion of the false lumen, resulting in the continued progressive expansion of the aorta. However, this technology has a good protective effect on the blood flow of the aortic branches, and visceral ischemia and paraplegia are rare. Postoperative aortic CTA shows that MFM still has an effective protective effect on thin intercostal arteries. Therefore, theoretically, this technology has the application potential for full-course repair of the aorta;

[0003] In order to solve the above technical problems, a new dense mesh bracket and a use method are proposed. Summary of the invention

[0004] In view of this, the present invention provides a novel dense mesh bracket and a use method to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial choice.

[0005] The technical solution of the present invention is implemented as follows: a novel dense mesh stent comprises an outer stent and an inner stent;

[0006] The outer support has a first dense mesh area, both ends of the first dense mesh area are sequentially woven with first transition areas, and one end of the first transition area is sequentially woven with a first end area;

[0007] The inner bracket has a second dense mesh area, both ends of the second dense mesh area are sequentially woven with second transition areas, one end of the second transition area is sequentially woven with a second end area, one side of the inner bracket is evenly distributed with blocking blocks integrally formed, and the blocking blocks of the inner bracket are engaged with the first dense mesh area of ​​the outer bracket;

[0008] The outer bracket is sleeved on one side of the inner bracket.

[0009] Further preferably, an arc portion is integrally formed on one side of the first end region of the outer bracket.

[0010] Further preferably, a protrusion is integrally formed on one side of the second end region of the inner bracket, and the protrusion is engaged with the arc-shaped portion.

[0011] Further preferably, the diameters of the two ends of the inner bracket and the outer bracket are larger than the diameters of the middle section, and the braiding density at the two ends is different from that in the middle section.

[0012] Further preferably, the outer stent and the inner stent are tubular braids, and diamond meshes are formed between the braided wires, and the braiding density of the outer stent and the inner stent at positions with the same diameter is the same.

[0013] Further preferably, the outer stent and the inner stent are both made of magnesium alloy as a matrix, which is melted with polylactic acid-co-glycolic acid polymer, and the surface of the outer stent is coated with sirolimus as an anti-proliferative drug coating.

[0014] Further preferably, the ratio of the braiding density at both ends of the outer bracket and the inner bracket to the braiding density in the middle section is 1:12-12:1, the length of the outer bracket and the inner bracket is 15-500mm, the diameter of the outer bracket is 2.5-55mm, and the diameter of the inner bracket is 2-54.5mm.

[0015] A method for using a novel dense mesh support comprises the following steps:

[0016] S1. Bracket inspection: check whether the status of the bracket meets the standard before installing the outer bracket and the inner bracket;

[0017] S2, bracket installation, the inner bracket and the outer bracket assembled into one are installed into the designated position, so that the portion of the outer bracket blocked by the blocking block of the inner bracket contacts the breach;

[0018] S3, local degradation: after the stent has been used for a certain period of time, the internal stent will partially degrade, and the blocking block will first complete the local degradation, thus releasing the blockage at the rupture;

[0019] S4. The stent is removed or completely degraded. The inner and outer stents are removed as needed, or the inner and outer stents are waited for to be completely degraded.

[0020] The embodiment of the present invention has the following advantages due to the adoption of the above technical solution:

[0021] 1. The present invention blocks the first local dense mesh area of ​​the outer stent by setting a blocking block of the inner stent, so that the blocking part contacts the breach, and can immediately block the primary breach caused by high-pressure blood flow impact after installation, and uses magnesium alloy as the stent base to enhance radial support force;

[0022] 2. The present invention prevents the stent from being dislocated by providing a first end region to cooperate with the second end region to achieve an anchoring effect, and provides an arc-shaped portion to enhance the initial anchoring effect, so that the protruding portion and the arc-shaped portion engage with each other to prevent the inner stent from being dislocated and coming out of the outer stent.

[0023] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural diagram of the present invention;

[0026] Figure 2 It is a side structural diagram of the present invention;

[0027] Figure 3 It is a structural diagram of the outer support and the inner support in the present invention;

[0028] Figure 4 It is a cross-sectional structural diagram of the present invention;

[0029] Figure 5 It is a front view structural diagram of the present invention;

[0030] Figure 6 The figure is a flow chart of the method of the present invention.

[0031] Figure numerals: 10, outer bracket; 11, first dense mesh area; 12, first end area; 13, arc portion; 14, first transition area; 20, inner bracket; 21, second dense mesh area; 22, second end area; 23, raised portion; 24, blocking block; 25, second transition area. DETAILED DESCRIPTION

[0032] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0033] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0034] like Figure 1-6 As shown, an embodiment of the present invention provides a new dense mesh bracket, which is composed of an outer bracket 10 and an inner bracket 20.

[0035] The outer support 10 is sleeved on the outer side of the inner support 20. Both the outer support 10 and the inner support 20 are tubular braids, and diamond meshes are formed between the braided wires. The braiding density of the outer support 10 and the inner support 20 at the same diameter position is the same.

[0036] The outer support 10 has a first dense mesh area 11 , both ends of the first dense mesh area 11 are sequentially woven with first transition areas 14 , and one end of the first transition area 14 is sequentially woven with a first end area 12 .

[0037] In one embodiment, in order to enhance the initial anchoring effect and prevent the external stent 10 from being dislocated due to high-pressure blood flow, an arc portion 13 is integrally formed on one side of the first end region 12 of the external stent 10 .

[0038] The inner bracket 20 has a second dense mesh area 21, and second transition areas 25 are sequentially woven at both ends of the second dense mesh area 21. A second end area 22 is sequentially woven at one end of the second transition area 25. One side of the inner bracket 20 is evenly distributed with integrally formed blocking blocks 24, and the blocking blocks 24 of the inner bracket 20 are engaged with the first dense mesh area 11 of the outer bracket 10.

[0039] In one embodiment, in order to prevent the inner bracket 20 from escaping from the outer bracket 10 , a protrusion 23 is integrally formed on one side of the second end region 22 of the inner bracket 20 , and the protrusion 23 is engaged with the arc portion 13 .

[0040] In one embodiment, the diameters of the two ends of the inner stent 20 and the outer stent 10 are larger than the diameters of the middle section, and the braiding density at the two ends is different from that in the middle section.

[0041] In one embodiment, in order to release the blocking of the first dense mesh area 11 of the outer stent 10 by the blocking block 24 after the rupture is repaired, the outer stent 10 and the inner stent 20 are both made of magnesium alloy as a matrix, integrated with polylactic acid co-glycolic acid polymer, and the surface is coated with sirolimus as an anti-proliferative drug coating.

[0042] In one embodiment, the ratio of the braiding density at both ends of the outer bracket 10 and the inner bracket 20 to the braiding density in the middle section is 12:1, the length of the outer bracket 10 and the inner bracket 20 is 200 mm, the diameter of the outer bracket 10 is 2.5 mm, and the diameter of the inner bracket 20 is 2 mm.

[0043] like Figure 6 As shown, the present invention also provides a method for using a novel dense mesh bracket, comprising the following steps:

[0044] S1, bracket inspection, before installing the outer bracket 10 and the inner bracket 20, check whether the status of the bracket meets the standard;

[0045] S2, bracket installation, the inner bracket 20 and the outer bracket 10 assembled into one are installed into a designated position, so that the portion of the outer bracket 10 blocked by the blocking block 24 of the inner bracket 20 is in contact with the breach;

[0046] S3, local degradation. After the stent has been used for a certain period of time, the inner stent 20 is partially degraded, and the blocking block 24 thereof is partially degraded first, thereby releasing the blockage at the rupture.

[0047] S4. The stent is removed or completely degraded. The inner stent 20 and the outer stent 10 are removed as required, or the inner stent 20 and the outer stent 10 are waited to be completely degraded.

[0048] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A new type of dense mesh bracket, characterized by: It comprises an outer support (10) and an inner support (20); The outer support (10) has a first dense mesh area (11), both ends of the first dense mesh area (11) are sequentially woven with first transition areas (14), and one end of the first transition area (14) is sequentially woven with a first end area (12); The inner support (20) has a second dense mesh area (21), second transition areas (25) are woven sequentially at both ends of the second dense mesh area (21), and a second end area (22) is woven sequentially at one end of the second transition area (25), and blocking blocks (24) are equidistantly distributed and integrally formed on one side of the inner support (20), and the blocking blocks (24) of the inner support (20) are engaged with the first dense mesh area (11) of the outer support (10); The outer bracket (10) is sleeved on one side of the inner bracket (20).

2. A novel dense mesh bracket according to claim 1, characterized in that: An arc-shaped portion (13) is integrally formed on one side of the first end region (12) of the outer bracket (10).

3. A novel dense mesh bracket according to claim 2, characterized in that: A protrusion (23) is integrally formed on one side of the second end region (22) of the inner bracket (20), and the protrusion (23) is engaged with the arc-shaped portion (13).

4. A novel dense mesh bracket according to claim 1, characterized in that: The diameters of the two ends of the inner support (20) and the outer support (10) are larger than the diameter of the middle section, and the braiding density of the two ends is different from that of the middle section.

5. The novel dense mesh bracket according to claim 1 is characterized in that: The outer support (10) and the inner support (20) are tubular braids, and diamond-shaped meshes are formed between the braided wires. The braiding density of the outer support (10) and the inner support (20) at positions with the same diameter is the same.

6. The novel dense mesh bracket according to claim 1 is characterized in that: The outer stent (10) and the inner stent (20) are both made of magnesium alloy as a matrix, into which polylactic acid-co-glycolic acid polymer is melted, and the surfaces thereof are coated with sirolimus as an anti-proliferative drug coating.

7. The novel dense mesh bracket according to claim 1 is characterized in that: The ratio of the braiding density at the two ends of the outer bracket (10) and the inner bracket (20) to the braiding density in the middle section is 1:12-12:1, the length of the outer bracket (10) and the inner bracket (20) is 15-500 mm, the diameter of the outer bracket (10) is 2.5-55 mm, and the diameter of the inner bracket (20) is 2-54.5 mm.

8. A new type of dense mesh bracket usage, characterized in that: The following steps are involved: S1, bracket inspection, before installing the outer bracket (10) and the inner bracket (20), check whether the status of the bracket meets the standard; S2, mounting the bracket, installing the internal bracket (20) and the external bracket (10) assembled into one piece into a designated position, so that the portion of the external bracket (10) blocked by the blocking block (24) of the internal bracket (20) contacts the breach; S3, local degradation. After the stent has been used for a certain period of time, the inner stent (20) is partially degraded, and the blocking block (24) thereof is partially degraded first, thereby releasing the blockage of the rupture. S4. The stent is removed or completely degraded. The inner stent (20) and the outer stent (10) are removed as required, or the inner stent (20) and the outer stent (10) are waited for to be completely degraded.

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