A fabric covering for a stent with a movable aperture position and a method of making the same

Abstract

The application discloses a fabric covering for a blood vessel stent with a movable opening position and a preparation method thereof. The fabric covering for a blood vessel stent with a movable opening position comprises a fabric covering body, the fabric covering body is in a tubular structure, a flat area and a wrinkled area in a ring shape are arranged on the fabric covering body, a round hole for docking a branch blood vessel is arranged on the wrinkled area, the round hole can move in the position of the wrinkled area along with the unfolding of the wrinkled area, the preparation method comprises the following steps: determining fabric covering body and round hole parameters; performing tubular fabric covering weaving on a double-needle bed warp knitting machine; and finally, performing wrinkling processing on the fabric section needing to be wrinkled by sleeving the fabric section on a corrugated pipe with corrugations arranged in an axial direction or a circumferential direction. In the application, the fabric covering is provided with a wrinkled area with elasticity, the round hole can move in the position of the wrinkled area along with the unfolding of the wrinkled area, position adjustment can be performed when the branch blood vessel is not completely aligned with the preset round hole during the operation process, the problem of misalignment of the pre-opened window is improved, more accurate alignment is realized, and the operation difficulty of the doctor is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomedical textile preparation, in particular to a fabric covering for a blood vessel stent with movable opening position and a preparation method thereof. BACKGROUND

[0002] With the aggravation of population aging, some common high-risk diseases of thoracic aorta such as thoracic aortic aneurysm and aortic dissection are becoming increasingly worse. Thoracic aortic endovascular exclusion repair has been widely used in the treatment of such diseases in recent years.

[0003] Most of the aortic covering stents used in the market at present have only one main stent. For complex aortic arch lesions, there are technical provisions for aortic covering stents with branches or pre-windowing of the main stent. However, for these two treatment technologies, most doctors feedback that the operation is very difficult. The branch stent or pre-window is difficult to align with the branch blood vessel during release. Therefore, there is an urgent need for a method that can improve the alignment accuracy.

[0004] Chinese Patent No. 201810355185.6 discloses an aortic covering stent. The patent sets an elastic film at the branch through hole to adjust the position of the through hole by the elastic deformation of the elastic film. However, the position of the film body that can be adjusted by this method is relatively limited. Only the elastic film around the through hole can be deformed, and there are still some difficulties in adjustment. Therefore, it is necessary to provide a fabric covering for a blood vessel stent with a simple circular hole position moving adjustment method and convenient positioning. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a fabric covering for a blood vessel stent with movable opening position and a preparation method thereof to solve the technical problems raised in the background.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] A fabric covering for a blood vessel stent with movable opening position, comprising a fabric covering body, the fabric covering body is a tubular structure, a flat area and a wrinkled area in a ring shape are arranged on the fabric covering body, a circular hole for docking a branch blood vessel is arranged on the wrinkled area, and the circular hole can move in the position of the wrinkled area along with the unfolding of the wrinkled area.

[0008] In the above summary, further, the corrugation direction of the wrinkles of the wrinkled area is arranged along the axial direction of the fabric covering.

[0009] In the above summary, further, the corrugation direction of the wrinkles of the wrinkled area is arranged along the circumferential direction of the fabric covering.

[0010] Further, in the above summary, the wave width of the single fold in the natural state of the fold area is 0.5-3 mm, the number of folds in the fold area is 3-30, the area ratio of the fold area to the flat area is 1:1-1:30, and the length of the fold area is 6-60 mm.

[0011] Further, in the above summary, the fabric film body is knitted by using one or more of mesh organization, rib organization, chain organization, double reverse organization, forging organization, or double warp flat organization.

[0012] Further, in the above summary, the fabric film body is knitted by using polyester, polypropylene, nylon, or silk.

[0013] Further, in the above summary, the length of the fabric film body is 40-300 mm, and the outer diameter is 8-48 mm. Further, in the above summary, the number of round holes is 1-3, and the diameter of the round hole is 6-14 mm.

[0014] A preparation method of a fabric film for a blood vessel stent with movable hole position, the preparation method comprising the following steps:

[0015] S1, determining the length and outer diameter parameters of the fabric film body, and then determining the number and diameter parameters of the round holes;

[0016] S2, tubular fabric film weaving on a double needle bed warp knitting machine;

[0017] S3, determining the parameters of the fold area, sleeving the fabric segment that needs to be folded on a corrugated pipe with corrugations arranged in the axial direction, then tightly winding a round of roving outside along the shape of the corrugation, heat treating at 110°C for 15 min, taking it down after air cooling, cleaning and drying to obtain a fabric film for a blood vessel stent with movable hole position.

[0018] A preparation method of a fabric film for a blood vessel stent with movable hole position, the preparation method comprising the following steps:

[0019] (1) determining the length and outer diameter parameters of the fabric film body, and then determining the number and diameter parameters of the round holes;

[0020] (2) tubular fabric film weaving on a double needle bed warp knitting machine;

[0021] (3) determining the parameters of the fold area, sleeving the fabric segment that needs to be folded on a corrugated pipe with corrugations arranged in the circumferential direction, then tightly winding a round of roving outside along the shape of the corrugation, heat treating at 110°C for 15 min, taking it down after air cooling, cleaning and drying to obtain a fabric film for a blood vessel stent with movable hole position.

[0022] The beneficial effects of the present application are:

[0023] In the present application, the fabric covering is provided with a stretchable wrinkle area, and the fabric in the wrinkle area can move and expand under external force. The round hole can move in the position of the wrinkle area with the expansion of the wrinkle area, which is convenient for adjusting the position when the branch blood vessel is not completely aligned with the preset round hole during the operation process, improves the problem of misalignment of the pre-open window, realizes more accurate alignment, and reduces the difficulty of the operation of the doctor. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present application;

[0025] Figure 2 It is another structural schematic diagram of the present application.

[0026] In the figure, 1 is a flat area, 2 is a wrinkle area, 3 is a round hole, 4 is a mesh organization, and 5 is a double warp flat organization. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in detail below through specific concrete examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied by means of other different specific embodiments, and various modifications or changes can be made to the details in the specification based on different views and applications without departing from the spirit of the present application. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0028] It should be noted that the diagrams provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component may be a random change in shape, number and proportion, and the layout pattern of the components may also be more complex.

[0029] Example 1 :

[0030] A fabric covering for a stent with a movable hole position, please refer to the attached Figure 1 and attached Figure 2 , the fabric covering body is a tubular structure, the fabric covering body is provided with a ring-shaped flat area 1 and a wrinkle area 2, the wrinkle area 2 is provided with a round hole 3 for docking a branch blood vessel, and the round hole 3 can move in the position of the wrinkle area with the expansion of the wrinkle area 2.

[0031] In this invention, the fabric covering body is provided with a stretchable pleated area 2. The pleats on the pleated area 2 have good stretchability. When releasing the vascular branch stent, the force can easily pull the pleated area 2 along the pleat direction. The round hole 3 can move to the position of the pleated area as the pleated area 2 unfolds. This facilitates the adjustment of the position of the branch blood vessel and the preset round hole 3 during the operation, improves the problem of misalignment of the pre-opened window, achieves more accurate alignment, and reduces the difficulty of the surgeon's operation.

[0032] It should be noted in the above embodiments that the wavy direction of the pleats in the pleated area 2 is arranged along the axial direction of the fabric coating (e.g., Figure 1 As shown), the wavy direction of the pleats in the pleated area can also be arranged along the circumference of the fabric coating (e.g. Figure 2 (As shown).

[0033] It should be further explained that the fabric covering body can be woven using one or more of the following weave methods: mesh, rib, chain braid, double reverse, warp-knit, or double warp-plain. In actual use, different weave methods can be selected according to different surgical scenarios. In this embodiment, please refer to the appendix. Figure 1 and attached Figure 2 As shown, in this embodiment, a fabric coating body with mesh structure 4 and double warp plain structure 5 is selected. Furthermore, during the implementation process, the fabric coating body can be made of polyester, polypropylene, nylon or silk.

[0034] In the above embodiments, as a preferred embodiment, the wave width of a single fold in the natural state of the folded area 2 is 0.5-3mm, the number of folds in the folded area 2 is set to 3-30, the area ratio of the folded area to the flat area is 1:1-1:30, and the length of the folded area 2 is set to 6-60mm.

[0035] In the above embodiments, as a preferred embodiment, the length of the fabric-coated body is 40-300mm and the outer diameter is 8-48mm.

[0036] In the above embodiments, as a preferred embodiment, the number of circular holes is 1-3, and the diameter of the circular holes is 6-14mm.

[0037] Example 2:

[0038] A method for preparing a fabric covering for a vascular stent with movable opening position, the method comprising the following steps:

[0039] S1. Determine the length and outer diameter parameters of the fabric coating body, and then determine the number and diameter parameters of the round holes;

[0040] S2, weaving the tubular fabric covering on the double needle bed warp knitting machine;

[0041] S3, determining the parameters of the crimping area, sleeving the fabric section needing crimping on the corrugated pipe with the corrugations arranged in the axial direction, then tightly winding a layer of roving outside along the shape of the corrugations, heat treating at 110℃ for 15 min, taking it down after air cooling, cleaning and drying to obtain the fabric covering for the blood vessel stent with the movable opening position.

[0042] In the embodiment, the crimps of the crimping area 2 of the fabric covering are arranged in the axial direction of the fabric covering body through the above method.

[0043] Example 3:

[0044] A preparation method of the fabric covering for the blood vessel stent with the movable opening position, the preparation method comprising the following steps:

[0045] (1), determining the length and outer diameter parameters of the fabric covering body, and then determining the number and diameter parameters of the circular holes;

[0046] (2), weaving the tubular fabric covering on the double needle bed warp knitting machine;

[0047] (3), determining the parameters of the crimping area, sleeving the fabric section needing crimping on the corrugated pipe with the corrugations arranged in the circumferential direction, then tightly winding a layer of roving outside along the shape of the corrugations, heat treating at 110℃ for 15 min, taking it down after air cooling, cleaning and drying to obtain the fabric covering for the blood vessel stent with the movable opening position.

[0048] In the embodiment, the crimps of the crimping area 2 of the fabric covering are arranged in the circumferential direction of the fabric covering body through the above method.

[0049] The above embodiments only express the specific implementation of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application.

Claims

1. A method for producing a fabric covering for a blood vessel stent having a movable hole position, characterized by, The fabric covering film comprises a fabric covering film body, the fabric covering film body is a tubular structure, the fabric covering film body is provided with an annular flat area and a corrugated area, the corrugated area is provided with a circular hole for docking a branch blood vessel, and the circular hole can move in the position of the corrugated area with the unfolding of the corrugated area; the fabric covering film body is knitted by using one or more of a mesh organization, a rib organization, a chain organization, a double reverse organization, a forged organization or a double warp flat organization; and the fabric covering film body is woven by using polyester, polypropylene, nylon or silk; The preparation method comprises the following steps: (1) determining the length and outer diameter parameters of the fabric covering film body, and then determining the number and diameter parameters of the circular holes; (2) weaving the tubular fabric covering film on a double needle bed warp knitting machine; (3) determining the parameters of the corrugated area, sleeving the fabric section needing to be corrugated on a corrugated pipe with wave crests arranged in the axial direction or in the circumferential direction, then tightly winding a roving line outside along the shape of the wave, heat treating at 110 DEG C for 15 min, taking it down after air cooling, cleaning and drying to obtain a fabric covering film for a blood vessel stent with a movable opening position.

2. The method of claim 1, wherein, The wave direction of the corrugated area is arranged in the axial direction of the fabric covering film.

3. The method of claim 1, wherein, The wave direction of the corrugated area is arranged in the circumferential direction of the fabric covering film.

4. The method according to claim 2 or 3, characterized in that, The wave width of a single corrugation of the corrugated area in a natural state is 0.5-3 mm, the number of corrugations of the corrugated area is 3-30, the area ratio of the corrugated area to the flat area is 1:1-1:30, and the length of the corrugated area is 6-60 mm.

5. The method of claim 4, wherein, The length of the fabric covering film body is 40-300 mm, and the outer diameter is 8-48 mm.

6. The method of claim 4, wherein, The number of the circular holes is 1-3, and the diameter of the circular holes is 6-14 mm.

Images