CN211094991U - Blood vessel covered stent capable of reducing blood seepage at suture position - Google Patents
Blood vessel covered stent capable of reducing blood seepage at suture position Download PDFInfo
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- CN211094991U CN211094991U CN201921653068.4U CN201921653068U CN211094991U CN 211094991 U CN211094991 U CN 211094991U CN 201921653068 U CN201921653068 U CN 201921653068U CN 211094991 U CN211094991 U CN 211094991U
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Abstract
The utility model belongs to the field of medical equipment, in particular to a blood vessel covered stent capable of reducing bleeding at a suture position, which comprises a bare stent and a blood vessel covered stent covering film covering the surface of the bare stent, wherein the blood vessel covered stent comprises a suture position and a non-suture position, and the bare stent is connected with the blood vessel covered stent through the suture position; the non-suture part is a part except the suture part of the vascular stent covering film; the bare stent is of a tubular structure and comprises a plurality of supporting frames, and the supporting frames are formed by connecting fold-line-shaped metal wires end to end; the sewing part comprises a plurality of sewing points, and the positions of the sewing points are positioned at the vertex and the midpoint of each folding line of the support frame. The utility model discloses a support tectorial membrane because the local encrypted mode of adoption for the hole that the department of sewing up of support and tectorial membrane formed is less, is difficult for taking place the oozing blood.
Description
Technical Field
The utility model belongs to the field of medical equipment, in particular to can reduce blood seepage's of suture department blood vessel covered stent.
Background
The covered stent is also called as a covered stent and consists of a stent and a thin-layer covered film, and refers to an artificial intracorporeal graft of which the inner surface or the outer surface of a bare tubular stent is partially or completely covered with a film material; the supporting function of the stent is utilized to fix the covering membrane on the normal vascular walls at two ends of pathological changes, so that blood flows in the covering membrane and is isolated from a tumor cavity. The covered stent not only keeps the supporting function of a bare stent, but also has the characteristics of membranous materials, isolates the intimal laceration from blood flow, and realizes the effect of treating diseased blood vessels by means of false lumen thrombosis.
At present, the membrane material for the aorta tectorial membrane stent in clinic mainly adopts the sandwich design of ePTFE (namely, ePTFE is adopted for the inner and outer layers, and the naked stent is covered in the middle) and the design of PET covering the naked stent in the outer layer. The vascular stent made of the ePTFE material has a plurality of defects, and because the ePTFE of the film covering material is smoother, cells are not easy to climb and grow, complete endothelialization is difficult to realize, and the risk of late thrombosis is possibly increased. Moreover, because of the sandwich design of the double-layer tubular stent and the ePTFE, the flexibility and the trafficability of the double-layer tubular stent are poor, and when the blood vessel near the lesion has serious calcification and serious distortion or is placed into the stent, the stent with the membrane is difficult to be delivered to the lesion part. In addition, ePTFE is not suitable for suturing and the bond strength to bare stents needs to be enhanced.
The PET covered stent is a textile material, has certain porosity, is easy to be attached by cells to form endothelialization after being implanted into a human body, and is suitable for suture processing. The covering film and the bracket are connected in a sewing mode, so that the connection fastness is strong, but the PET film is hard. To reduce the stiffness of the PET film and to facilitate its compression into the conveyor, it is often done by varying its thickness. The thickness is reduced, which in turn causes new problems. For example, the abrasion resistance of the coating film. The prior art can increase local wear resistance through the mode of reinforcing local durable, but the in-process of PET membrane sewing up, and the seam needle passes the tectorial membrane after, changes and forms the hole of pinhole diameter size, and the department of sewing up is more, and the hole is more, implants human back, and the hole department can cause more oozing blood, does not have the patent literature at present to reduce the tectorial membrane support and sews up the blood and does the design improvement.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects, the utility model aims at providing a can reduce blood vessel covered stent who sews up a department's oozing blood to solve prior art, the PET tectorial membrane is sewing up the in-process with naked support, and the department's pinhole of sewing up causes the too big problem of oozing blood greatly.
In order to realize the above utility model purpose, the utility model discloses a technical scheme be:
a blood vessel covered stent capable of reducing blood seepage at a suture part comprises a bare stent and a blood vessel covered stent covering film covering the surface of the bare stent, wherein the blood vessel covered stent comprises a suture part and a non-suture part, and the bare stent is connected with the blood vessel covered stent through the suture part; the non-suture part is a part except the suture part of the vascular stent covering film; the bare stent is of a tubular structure and comprises a plurality of supporting frames, and the supporting frames are formed by connecting fold-line-shaped metal wires end to end; the sewing part comprises a plurality of sewing points, and the positions of the sewing points are positioned at the vertex and the midpoint of each folding line of the support frame.
Further, the yarn twist at the non-seam is higher than the yarn twist at the seam.
Furthermore, the thickness of the vascular stent covering membrane is between 0.09mm and 0.13 mm.
Further, the area of a single sewing point is 1mm2～2.0mm2In the meantime.
Furthermore, the vascular stent covering film adopts warp and weft yarns to be interwoven to form a plain weave structure, and the warp and weft yarns are all PET filaments.
Further, the warp density at the non-stitching position is 160-180ends/inch, and the weft density is 130-150 boxes/inch.
Further, the diameter of the covering film at the sutured site is larger than that at the non-sutured site.
Further, the diameter of the coating at the sewing position is 3% -5% larger than that of the coating at the non-sewing position.
Furthermore, in the two supporting frames which are adjacently arranged in the axial direction of the bare stent, the wave crest of one supporting frame is aligned with the wave crest of the other supporting frame, and the wave trough of one supporting frame is aligned with the wave trough of the other supporting frame, and a gap which allows the bare stent to be bent and folded is reserved between the two adjacent supporting frames.
Further, the warp density at the seam is 240-260ends/inch, and the weft density is 150-170 boxes/inch.
Adopt above-mentioned structure, the utility model has the advantages of as follows:
1) the utility model discloses a vascular support tectorial membrane because the local encrypted mode of adoption for the hole that the department of sewing up of support and tectorial membrane formed is less, is difficult for taking place the oozing blood.
2) The utility model discloses a vascular support tectorial membrane, the longitude and latitude yarn of the department of sewing up of support and tectorial membrane is owing to adopt the less yarn of twist for the department of sewing up of support and tectorial membrane, yarn elasticity increases easily and removes, thereby the cavity that forms is less, is difficult for taking place the oozing blood.
3) The utility model discloses a vascular support tectorial membrane, the tectorial membrane diameter that department was sewed up with the tectorial membrane to support increases 1mm for be unlikely to tighten up the tectorial membrane and increase and sew up the hole sewing up the in-process sewing up, sew up the back diameter and the department is the same with the department of sewing up.
4) The utility model discloses a vascular support tectorial membrane more has the adaptability to the seam needle and the suture of different diameters.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
wherein, 1 bare stent, 2 blood vessel stent covering films, 3 suture parts and 4 supporting frames.
Detailed Description
The invention will be further elucidated with reference to the embodiments described hereinafter.
Example 1
A blood vessel covered stent capable of reducing blood seepage at a suture position comprises a bare stent 1 and a blood vessel covered stent 2 covering the surface of the bare stent, wherein the blood vessel covered stent 2 comprises a suture position and a non-suture position, and the bare stent 1 and the blood vessel covered stent 2 are connected through the suture position 3. The non-sutured part is a part of the vascular stent covering film 2 except the sutured part. The yarn twist at the non-stitching is higher than the yarn twist at the stitching.
The bare stent 1 is of a tubular structure and comprises a plurality of supporting frames 4, and the supporting frames 4 are formed by connecting fold-line-shaped metal wires end to end; the W-shaped structure of the support frame can reduce the folds of the vascular stent covering film 2 and enhance the adherence;
the sewing part 3 comprises a plurality of sewing points, and the positions of the sewing points are positioned at the top points and the middle points of all the folding lines of the support frame 4; the area of the single sewing point is 1.0mm2～2.0mm2In the meantime.
In two support frames 4 that axially adjacent set up of naked support 1, the crest of one and the crest of another, the trough of one and the trough of another all align to set up one by one, leave the clearance that allows naked support 1 to bend folding between two adjacent support frames 3 for body 1 can carry out free bending to the peripheral direction.
The vascular stent covering film 2 is formed by interweaving warp and weft yarns to form a plain weave structure, and the warp and weft yarns are all PET filaments. The vascular stent covering film 2 is a polyester stent covering film; the thickness is between 0.09mm and 0.13 mm.
The bare stent 1 and the stent covering film 2 are in point contact, and the area of the contact point is determined by the diameter of the wire. The utility model discloses an increase the density of interweaving of the longitude and latitude yarn of contact point and realize to form cubic local sewing region (the department of sewing up promptly).
The warp density at the non-sewing position is 160-180ends/inch, and the warp density at the sewing position is increased to 240-260 ends/inch.
The weft density at the non-sewing part is 130-150picks/inch, and the weft density at the sewing part is increased to 150-170 picks/inch.
At the non-sewing position of the vascular stent covering film, yarns are obtained by twisting FDY filament doubling yarns, the twist of the yarns at the sewing point is lower than that of the non-sewing position, the yarns are in a loose state after being woven, and the yarns are easy to restore to the original position after being sewn.
The intravascular stent covering film controls the density of warp yarns by changing the number of reeded yarns.
The diameter of the covering film at the sewing part is larger than that at the non-sewing part. The diameter of the covering film at the sewing position is 3% -5% larger than that of the covering film at the non-sewing position. The vascular stent covering film reduces the stress concentration of the covering film at the sewing position by slightly increasing the diameter of the covering film at the sewing position, and reduces and avoids the increase of holes caused by the fact that yarns are excessively stressed and pulled.
After weaving, the vascular stent covering membrane is cleaned, dried and heat-set, so that the tubular stent covering membrane is obtained.
Example 2:
a blood vessel covered stent capable of reducing blood seepage at a suture position comprises a bare stent 1 and a blood vessel covered stent 2 covering the surface of the bare stent, wherein the blood vessel covered stent 2 comprises a suture position and a non-suture position, and the bare stent 1 and the blood vessel covered stent 2 are connected through the suture position 3. The non-sutured part is a part of the vascular stent covering film 2 except the sutured part. The yarn twist at the non-stitching is higher than the yarn twist at the stitching.
The bare stent 1 is of a tubular structure and comprises a plurality of supporting frames 4, and the supporting frames 4 are formed by connecting fold-line-shaped metal wires end to end; the W-shaped structure of the support frame can reduce the folds of the vascular stent covering film 2 and enhance the adherence;
the sewing part 3 comprises a plurality of sewing points, and the positions of the sewing points are positioned at the top points and the middle points of all the folding lines of the support frame 4; the area of the single sewing point is 1.0mm2～2.0mm2In the meantime.
In two support frames 4 that axially adjacent set up of naked support 1, the crest of one and the crest of another, the trough of one and the trough of another all align to set up one by one, leave the clearance that allows naked support 1 to bend folding between two adjacent support frames 3 for body 1 can carry out free bending to the peripheral direction.
The vascular stent covering film 2 is formed by interweaving warp and weft yarns to form a plain weave structure, and the warp and weft yarns are all PET filaments. The vascular stent covering film 2 is a polyester stent covering film; the thickness is between 0.09mm and 0.13 mm.
The bare stent 1 and the stent covering film 2 are in point contact, and the area of the contact point is determined by the diameter of the wire. The utility model discloses an increase the density of interweaving of the longitude and latitude yarn of contact point and realize to form cubic local sewing region (the department of sewing up promptly).
Yarn specification: the warp and weft yarns at the non-sewing position are doubled by adopting two 20D yarns and then twisted by 800 twists/m, and the warp and weft yarns at the sewing position are doubled by adopting two 20D yarns and then twisted by 400 twists/m.
The fabric structure is as follows: a plain weave structure is used.
Diameter of the coating film: the diameter of the film at the non-suture position was 28 mm. The diameter of the coating at the non-seam refers to the diameter of the cylinder at the non-seam (i.e., the diameter of the circle of the cross-section at the non-seam) being 28 mm.
Fabric density: the warp yarns at the non-sewing points adopt 170ends/inch, and the weft yarn density adopts 140 clips/inch; the warp density at the stitch point was 240ends/inch and the weft density was 140 picks/inch.
The weaving process comprises the following steps: adopt loom, 692 yarn altogether, the law of reeding is: and the number of the yarns is 42, and the yarns are sewn at the dense part and 14 at the non-sewing part.
The diameter of the film at the sutured site was 29mm, which was slightly increased by 3.5% relative to the film at the non-sutured site.
After post-treatment, the stent is sewn with the stent, and the water seepage amount of the sewn holes is tested on a water seepage instrument. Measuring 1cm2The water permeability of the covered membrane and the whole water permeability of the covered stent are calculated to obtain the water permeability of the sutured part (the water permeability of the sutured part is the whole water permeability of the covered stent-1 cm)2Water permeability of the coating film as a coating film surface area. The 10 times of test results show that the water permeation quantity of the suture part is from the original average 315ml/min/cm2The average reduction is 190ml/min/cm2。
Example 3:
a blood vessel covered stent capable of reducing blood seepage at a suture position comprises a bare stent 1 and a blood vessel covered stent 2 covering the surface of the bare stent, wherein the blood vessel covered stent 2 comprises a suture position and a non-suture position, and the bare stent 1 and the blood vessel covered stent 2 are connected through the suture position 3. The non-sutured part is a part of the vascular stent covering film 2 except the sutured part. The yarn twist at the non-stitching is higher than the yarn twist at the stitching.
The bare stent 1 is of a tubular structure and comprises a plurality of supporting frames 4, and the supporting frames 4 are formed by connecting fold-line-shaped metal wires end to end; the W-shaped structure of the support frame can reduce the folds of the vascular stent covering film 2 and enhance the adherence;
the sewing part 3 comprises a plurality of sewing points, and the positions of the sewing points are positioned at the top points and the middle points of all the folding lines of the support frame 4; the area of the single sewing point is 1.0mm2～2.0mm2In the meantime.
In two support frames 4 that axially adjacent set up of naked support 1, the crest of one and the crest of another, the trough of one and the trough of another all align to set up one by one, leave the clearance that allows naked support 1 to bend folding between two adjacent support frames 3 for body 1 can carry out free bending to the peripheral direction.
The vascular stent covering film 2 is formed by interweaving warp and weft yarns to form a plain weave structure, and the warp and weft yarns are all PET filaments. The vascular stent covering film 2 is a polyester stent covering film; the thickness is between 0.09mm and 0.13 mm.
The bare stent 1 and the stent covering film 2 are in point contact, and the area of the contact point is determined by the diameter of the wire. The utility model discloses an increase the density of interweaving of the longitude and latitude yarn of contact point and realize to form cubic local sewing region (the department of sewing up promptly).
Yarn specification: the warp and weft yarns at the non-sewing position are doubled by adopting two 20D yarns and then twisted by 800 twists/m, and the warp and weft yarns at the sewing position are doubled by adopting two 20D yarns and then twisted by 400 twists/m.
The fabric structure is as follows: a plain weave structure is used.
Diameter of the coating film: the diameter of the film at the non-suture position was 28 mm.
Fabric density: the warp yarns at the non-sewing points adopt 170ends/inch, and the weft yarn density adopts 140 clips/inch; the warp density at the stitch point was 260ends/inch, and the weft density was 160 picks/inch.
The weaving process comprises the following steps: adopt the loom, totally 744 yarns, the law of reeding is: and the number of yarns is 42, 22 yarns are arranged in each reed at the joint of the dense part, and 14 yarns are arranged in each reed at the non-joint part.
The diameter of the film at the seam was 29mm, which increased slightly by 3.5%.
After post-treatment and sewing with the stent, the obtained covered stent is tested on a water seepage instrumentThe water seepage quantity at the stitching holes. Measuring 1cm2The water permeability of the covered membrane and the whole water permeability of the covered stent are calculated to obtain the water permeability of the sutured part (the water permeability of the sutured part is the whole water permeability of the covered stent-1 cm)2Water permeability of the coating film as a coating film surface area. The 10 times of test results show that the water permeation quantity of the suture part is from the original average 315ml/min/cm2The average decrease is 175ml/min/cm2。
It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
Claims (10)
1. A blood vessel covered stent capable of reducing blood seepage at a suture part comprises a bare stent and a blood vessel covered stent covering film covering the surface of the bare stent, and is characterized in that the blood vessel covered stent comprises a suture part and a non-suture part, and the bare stent is connected with the blood vessel covered stent through the suture part; the non-suture part is a part except the suture part of the vascular stent covering film; the bare stent is of a tubular structure and comprises a plurality of supporting frames, and the supporting frames are formed by connecting fold-line-shaped metal wires end to end; the sewing part comprises a plurality of sewing points, and the positions of the sewing points are positioned at the vertex and the midpoint of each folding line of the support frame.
2. The stent graft capable of reducing bleeding at the sutured sites according to claim 1, wherein the yarn twist at the non-sutured sites is higher than the yarn twist at the sutured sites.
3. The stent-graft capable of reducing bleeding at a suture according to claim 1, wherein the thickness of the stent-graft is between 0.09mm and 0.13 mm.
4. The stent graft of claim 1, capable of reducing bleeding at the sutureThe frame is characterized in that the area of a single sewing point is 1mm2～2.0mm2In the meantime.
5. The stent graft capable of reducing blood leakage from a sutured site according to claim 1, wherein the stent graft is woven by using warp and weft yarns to form a plain weave structure, and the warp and weft yarns are both PET filaments.
6. The stent graft capable of reducing blood leakage at the sutured site according to claim 5, wherein the warp density at the non-sutured site is 160-180ends/inch and the weft density is 130-150 folds/inch.
7. A vascular stent graft capable of reducing bleeding at the suture according to claim 1, wherein the diameter of the graft at the suture is larger than the diameter of the graft at the non-suture.
8. The vascular stent graft capable of reducing bleeding at the suture site according to claim 7, wherein the diameter of the stent graft at the suture site is 3-5% larger than that of the stent graft at the non-suture site.
9. The vascular stent graft capable of reducing bleeding at the suture position according to claim 1, wherein in the two stents arranged adjacently in the axial direction of the bare stent, the peak of one stent is aligned with the peak of the other stent, and the valley of one stent is aligned with the valley of the other stent, and a gap allowing the bare stent to bend and fold is left between the two adjacent stents.
10. The stent-graft capable of reducing blood leakage at a suture site according to claim 1, wherein the warp density at the suture site is 240-260ends/inch and the weft density is 150-170 pins/inch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921653068.4U CN211094991U (en) | 2019-09-30 | 2019-09-30 | Blood vessel covered stent capable of reducing blood seepage at suture position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921653068.4U CN211094991U (en) | 2019-09-30 | 2019-09-30 | Blood vessel covered stent capable of reducing blood seepage at suture position |
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| Publication Number | Publication Date |
|---|---|
| CN211094991U true CN211094991U (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921653068.4U Active CN211094991U (en) | 2019-09-30 | 2019-09-30 | Blood vessel covered stent capable of reducing blood seepage at suture position |
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