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Medical fabric

A medical and fabric technology, applied in the field of medical fabrics for implants, can solve the problems of low water permeability and tear strength, and achieve the effects of small water permeability, small diameter and thin thickness.

Active Publication Date: 2018-08-31
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The present inventors conducted in-depth research and repeated experiments, and found that by adjusting the twist coefficient of the warp and / or weft, the problems of low water permeability and tear strength can be solved, and then the grafts for branched stent grafts Composed of fabric, and the branches form a specific weave structure, thereby preventing liquid leakage, and completed the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0205]

[0206] Polyethylene terephthalate (PET) was used as a raw material, and melt spinning was performed to wind up an undrawn yarn of 65 decitex.

[0207] The properties of the raw material PET polymerized with the germanium catalyst are as follows.

[0208] Reduced viscosity (ηsp / c): 1.162dl / g

[0209] Titanium content: 2ppm

[0210] Diethylene glycol content: 0.8% by weight

[0211] Oligomer content: 1.2% by weight

[0212] The spinneret holes used were 5-layered spinneret holes with a hole diameter of 0.08 mmφ, the distance between the innermost jet nozzles was 1.7 mm, and the distance between all the rows was 8 mm. The cooling of the filaments basically used a cooling air jetting device having a jetting outlet at an elevation angle of 37°. In addition, under the spinning conditions (the surface temperature of the spinneret hole is 303°C, the temperature distribution of the spinneret hole is 3°C, the length of the hot zone is 36mm, the temperature of the cooling ai...

Embodiment 2

[0222]

[0223] Polyethylene terephthalate (PET) was used as a raw material, and melt spinning was performed to wind up an undrawn yarn of 140 decitex. Microfibers were produced under the same conditions as in Example 1.

[0224]

[0225] By the above-mentioned spinning, a total fineness of 72.4 dtex / 450 filaments was produced as a weft.

[0226] The total fineness used in the warp yarn is 34.1 dtex / 24 filaments, the appropriate spinneret holes are selected, melt spinning is performed, and the draw ratio is set to produce.

[0227]

[0228] Using a known twister, warp yarns were twisted 500 times / m (S direction twist) and weft yarns were twisted 100 times / m (S direction twist) to produce twisted yarns.

[0229]

[0230] Using the above-mentioned warp and weft, under the same conditions as in Example 1, a flat-woven tubular seamless fabric with an inner diameter of 50 mm was produced. Furthermore, scouring and heat setting are performed on this fabric to perform finis...

Embodiment 3

[0232]

[0233] Microfibers were produced under the same conditions as in Example 1.

[0234]

[0235] By the above-mentioned spinning, a total fineness of 20.1 dtex / 155 filaments was produced as a weft. Spinning was performed under the same conditions as in Example 2. As the warp, a total fineness of 34.1 decitex / 24 filaments was produced.

[0236]

[0237] Using a known twister, warp yarns were twisted 500 times / m (S direction twist) and weft yarns were twisted 100 times / m (S direction twist) to produce twisted yarns.

[0238]

[0239] Using the above-mentioned warp and weft, under the same conditions as in Example 1, a flat-woven tubular seamless fabric with an inner diameter of 50 mm was produced. Furthermore, scouring and heat setting are performed on this fabric to perform finishing. The evaluation results of the obtained fabrics are shown in Tables 1 and 2 below.

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Abstract

Provided is a medical fabric that is thin, and has both high tear strength and low water permeability. The medical fabric is characterized in that multifilament yarns having a total fineness of 7-80 dtex are disposed in the warp and weft, the single yarn fineness of at least one of the multifilament yarns among the warp and weft is 0.5 dtex or less, the twist factor A of the weft is 50-2,000, thethickness is 10-90 [mu]m, and the water permeability both before and after puncture by a needle is 300 cc / min / cm2 or less.

Description

technical field [0001] The present invention relates to fabrics suitable as implantable materials that are thin but have excellent tear strength and water permeability and can be applied to stent grafts, for example, medical fabrics for grafts having branches for stent grafts. Background technique [0002] Conventionally, the treatment of aortic aneurysm has been performed by artificial blood vessel replacement using an artificial blood vessel, but recently, catheter-based endovascular treatment using a stent graft has rapidly expanded. [0003] This is because stent-graft surgery does not involve thoracotomy or laparotomy, so physical and economic burdens are reduced. The stent-graft is loaded into a catheter, inserted through an artery at the base of the leg, and delivered to the surgical site. Therefore, catheters with small diameters are required so that they can also be used in patients with thin arteries, and it is expected that the stent grafts will also be folded sm...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/07D03D1/00D03D3/02
CPCD03D3/02A61F2002/065A61F2250/0023A61F2/07A61F2240/001D03D15/33A61F2/95D03D1/00D10B2509/06D03D15/43D01D5/088D06C7/02D10B2331/04
Inventor 中泽彰仁奥野登起男
Owner ASAHI KASEI KK
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