WO2015093480A1 - 人工血管 - Google Patents
人工血管 Download PDFInfo
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- WO2015093480A1 WO2015093480A1 PCT/JP2014/083266 JP2014083266W WO2015093480A1 WO 2015093480 A1 WO2015093480 A1 WO 2015093480A1 JP 2014083266 W JP2014083266 W JP 2014083266W WO 2015093480 A1 WO2015093480 A1 WO 2015093480A1
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- Prior art keywords
- blood vessel
- artificial blood
- dtex
- yarn
- inner layer
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/0063—Implantable repair or support meshes, e.g. hernia meshes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/14—Macromolecular materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/14—Macromolecular materials
- A61L27/18—Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L27/507—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials for artificial blood vessels
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
- D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
- D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
- D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D3/00—Woven fabrics characterised by their shape
- D03D3/02—Tubular fabrics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/0063—Implantable repair or support meshes, e.g. hernia meshes
- A61F2002/0068—Implantable repair or support meshes, e.g. hernia meshes having a special mesh pattern
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2509/00—Medical; Hygiene
- D10B2509/06—Vascular grafts; stents
Definitions
- the present invention relates to a low blood permeability artificial blood vessel. More specifically, the present invention relates to a cloth artificial blood vessel that makes it possible to reduce the amount of blood leakage from the fiber gap.
- Cloth-made artificial blood vessels that have less blood leakage with only fibers can be classified into knitted and woven tissues based on their basic structure.
- the knitted structure is characterized in that the manufacturing process is simple and has flexibility, but in addition to its weak shape maintenance force, it tends to have a porous structure, and blood easily leaks from the fiber gap. Therefore, an artificial blood vessel of a knitted tissue is used as an artificial blood vessel or the like used for repairing an artery or the like at the periphery of a limb, which is a portion where life is not immediately jeopardized even when blood leaks.
- a woven tissue is used for an artificial blood vessel used for an operation such as an aorta because a fiber gap can be made smaller and blood can hardly leak than a knitted tissue.
- a knitted and woven structures there are non-woven structures.
- non-woven tissue artificial blood vessels are not used because of the non-uniformity of the structure and the instability of maintaining the shape.
- Non-patent Documents 1 and 2 are so-called coated artificial blood vessels and coated patches, which have already been commercialized.
- Patent Document 1 discloses an invention related to a fiber medical material in which ultrafine fibers of 0.5 denier or less are non-woven fabrics
- Patent Document 2 discloses ultrafine fibers of 0.5 decitex or less and 1 decitex or more. An invention of a multi-structure fabric using these fibers is disclosed.
- Non-Patent Document 1 and Non-Patent Document 2 since many substances such as collagen and gelatin used for clogging coated artificial blood vessels and coated artificial patches are naturally derived substances, quality stabilization is achieved. Is extremely difficult to use as an industrial product.
- Patent Document 1 since ultrafine fibers are used at a low density as a non-woven fabric, there are variations, and the target blood leakage cannot be achieved unless it is combined with the woven fabric in two layers, so the performance is stable. There was no problem.
- Patent Document 2 since weaving is performed at a low density with emphasis on flexibility, blood leakage is expected to fill the gaps in the fabric with thrombus adhering to the surface of the ultrafine fibers. There was a problem of variation and instability.
- the present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a cloth artificial blood vessel that can reduce the amount of blood leakage from the fiber gap. is there.
- an artificial blood vessel using a multifilament having a large single yarn fineness as a part of a warp is known.
- an artificial blood vessel using a microfiber multifilament to promote rapid adhesion and proliferation of vascular endothelial cells is also known.
- an artificial blood vessel excellent in blood leakage resistance has not been proposed.
- the present invention has been made in view of the fact that it is important to make the density of the woven fabric dense on the inner wall surface mainly composed of microfiber multifilaments in order to suppress blood leakage. It consists of. (1) An artificial blood vessel having a cylindrical multi-woven structure, and as a warp mainly constituting an inner layer in contact with a blood flow, a microfiber multifilament yarn having a single yarn fineness of 0.5 dtex or less and an outer layer mainly The artificial blood vessel is characterized in that two types of multifilament yarns having a single yarn fineness of 1.0 dtex or more are used as warp yarns, and the apparent cover factor of the inner layer is 2000 or more.
- the artificial blood vessel according to (1) wherein an inner surface exposure degree of the multifilament yarn is 20% or less.
- a microfiber multifilament yarn having a single yarn fineness of 0.5 dtex or less is used for at least a part of the weft yarn of the inner layer.
- a monofilament yarn having a single yarn fineness of 15 dtex or more is used for at least a part of the weft.
- the artificial blood vessel of the present invention has the above-described configuration, thereby providing various characteristics required for the artificial blood vessel and reducing the amount of blood leakage from the fiber gap.
- FIG. 1 is an enlarged photograph of the inner surface opened by cutting in the longitudinal direction of the artificial blood vessel in order to obtain the apparent cover factor of the inner layer (150 times).
- FIG. 2 is an enlarged schematic view of the main part of FIG. 1 in order to explain how to determine the apparent cover factor of the inner layer.
- the fiber fineness of the multifilament yarn is too large, it becomes too rigid to bend, and when the artificial blood vessel is bent, it causes kink and is exposed to the inner surface, and is preferably 10.0 dtex or less.
- the apparent cover factor of the inner layer represents the degree of fiber gap (packing density) between the fibers of the inner layer, and the smaller the fiber, the wider the gap between the fibers.
- the microfiber multifilament yarn of the inner layer has a dense structure, and blood leakage can be suppressed.
- the macrofiber multifilament yarn is tightly stretched, the adhesion and growth of the vascular endothelial cells are enhanced, and the vascular endothelial cell fixing properties are improved.
- the higher the apparent cover factor of the inner layer the better for the vascular endothelial cell fixation, but if it becomes too high, the flexibility of the blood vessel is impaired, and the weaving efficiency during production is also impaired.
- the apparent cover factor of the inner layer is preferably 3000 or less.
- the inner surface exposure of the multifilament yarn is preferably 20% or less, more preferably 5% or less, and even more preferably 1% or less.
- the sticking property of the vascular endothelial cell to the inner layer of the artificial blood vessel becomes better.
- the vascular endothelial cells attached to the artificial blood vessel inner layer are longitudinally and transversely along the fiber surface composed of the warp and the weft. It can grow endlessly and form a thin skin of vascular endothelial cells inside the artificial blood vessel.
- the single yarn fineness of the warp and weft constituting the inner layer is preferably 0.5 dtex or less, and from the viewpoint of sticking to vascular endothelial cells
- the preferred single yarn fineness of the warp and weft constituting the inner layer is 0.4 dtex or less, particularly preferably 0.3 dtex or less, and more preferably 0.25 dtex or less.
- the single yarn fineness is 0.008 dtex or less, the cell adhesion tends to be inhibited.
- the single yarn fineness of the warp and weft constituting the inner layer is preferably more than 0.008 dtex, and more preferably the single yarn fineness is 0.02 dtex or more. More preferably, the single yarn fineness of the warp and weft constituting the inner layer is 0.02 to 0.25 dtex, particularly 0.05 to 0.25 dtex.
- microfiber multifilament As the microfiber multifilament, a so-called direct spinning type may be used as it is, but a split fiber type may also be used.
- the split fiber type can be made ultrafine after forming a tubular woven fabric using fibers that can be made ultrafine by chemical or physical means. For example, as shown in US Pat. No. 3,531,368 and US Pat. No. 3,350,488, one component of a multicomponent fiber is removed or exfoliated as a method of ultrafinening by chemical or physical means. There is a method of fibrillation or ultrathinning by means such as making them.
- the artificial blood vessel of the present invention is preferably a double-woven artificial blood vessel integrally woven by known means such as inner wall layer warp fastening, inner wall layer weft fastening, double weft fastening or the like.
- polyester fibers are preferable from the viewpoint of water absorption and deterioration resistance.
- polyester fiber include fibers made of polyethylene terephthalate, polybutylene terephthalate, and the like. It may be a fiber made of a copolyester obtained by copolymerizing polyethylene terephthalate or polybutylene terephthalate with an aliphatic dicarboxylic acid such as isophthalic acid, 5-sodium sulfoisophthalic acid or adipic acid as an acid component.
- the combination of fibers constituting the multifilament may be the same or different, and can be appropriately combined.
- a water jet room, an air jet room, a rapier room, a shuttle room, and the like can be used.
- a shuttle room which is excellent in weaving property in a cylindrical shape and can obtain a uniform cylindrical structure.
- a plain woven fabric, a twill woven fabric, a satin woven fabric, and a woven fabric such as a modified woven fabric or a multi-woven woven fabric can be used.
- a basic weaving method known means can be adopted.
- the artificial blood vessel of the present invention can be applied to an artificial blood vessel to which an antithrombotic agent is applied.
- the antithrombotic agent may be applied, for example, by carrying a biological anticoagulant such as heparin, low molecular weight heparin, urokinase or hirudin, or a synthetic anticoagulant or synthetic such as argatroban, warfarin, acetylsalicylic acid or ticlopidine.
- An antiplatelet drug may be carried.
- a hydrophilic polymer such as polyethylene glycol, polyvinyl alcohol or polyvinyl pyrrolidone may be supported.
- the method of carrying is not particularly limited, and a method of coating the surface of the multifilament yarn using a solution containing the above drug or polymer, or a multifilament by chemically introducing a reactive functional group into the drug or polymer.
- a method of immobilizing the surface of the yarn by a chemical reaction such as a condensation reaction, a method of immobilizing a drug or polymer by a radical reaction using high energy rays, or impregnating a drug or polymer into collagen, gelatin, hydrogel, etc.
- ionic compounds such as heparin
- a method in which counter ions are bonded to the surface in advance and then ion bonded can be preferably used.
- a drug or polymer may be supported on a multifilament yarn that is used in advance.
- it may be imparted after forming a composite tubular woven fabric from the viewpoint of reducing manufacturing costs. preferable.
- the artificial blood vessel of the present invention can be used for preclotting.
- FIG. 1 is an enlarged photograph (150 times).
- FIG. 2 is an enlarged schematic view of the main part of FIG. 1 in order to explain how to determine the apparent cover factor of the inner layer.
- a line parallel to the warp and the weft is drawn to obtain a unit area (1 mm ⁇ 1 mm) square (a figure surrounded by a thin line in FIG. 1), and the warp woven structure inside the square
- the peak part that protrudes even slightly from the square is 0.5.
- the peak part in the square of FIG. 1 is counted, it will be 21 (unit number c). From the unit number c, the number (C) of 25.4 mm square peaks is obtained.
- Example 1 As warp yarns, a polyethylene terephthalate microfiber multifilament yarn having a single yarn fineness of 0.23 dtex, a total fineness of 33 dtex, 144 filaments, and a polyethylene terephthalate multifilament yarn having a single yarn fineness of 2.33 dtex, total fineness of 56 dtex, and 24 filaments. Each was prepared and pasted with a single gluing machine. Two warp yarns were made at a width of 25 mm in the order of two microfiber multifilament yarns and one multifilament yarn, and the warp yarns were placed on a narrow dobby shuttle 2-cutter loom.
- the raw machine thus obtained was scoured, a stainless steel rod having an outer diameter of 15.5 mm was inserted into an artificial blood vessel, and heat setting was performed at 170 ° C.
- the apparent cover factor, inner surface exposure degree, and blood leakage of the inner layer of the artificial blood vessel thus obtained were evaluated. The results are shown in Table 3. The blood leakage was sufficient to withstand use.
- Example 3 An artificial blood vessel was obtained by the same method (woven tissue 2) as in Example 2 except that polyethylene terephthalate microfiber multifilament yarn having a single yarn fineness of 0.23 dtex and a total fineness of 33 dtex and 144 filaments was used as the weft.
- the apparent cover factor, inner surface exposure degree, and blood leakage of the inner surface of the artificial blood vessel thus obtained were evaluated. The results are shown in Table 3. The degree of exposure to the inner surface was zero, and blood leakage was suppressed even more than in Example 2.
- Example 4 As warp yarn, polyethylene terephthalate microfiber multifilament yarn with single yarn fineness of 0.30 dtex, total fineness of 44 dtex, 144 filament and single yarn fineness of 2.33 dtex, total fineness of 56 dtex, 24 filament polyethylene terephthalate multifilament yarn is prepared
- Example 5 As warp yarn, polyethylene terephthalate microfiber multifilament yarn with single yarn fineness of 0.084dtex, total fineness of 53dtex, 630 filaments and single yarn fineness of 2.33dtex, total fineness of 56dtex, 24 filaments of polyethylene terephthalate multifilament yarn are prepared Example 2 except that a polyethylene terephthalate microfiber multifilament yarn having a single yarn fineness of 0.084 dtex, a total fineness of 53 dtex, and 630 filaments was prepared as the weft, and the number of wefts driven was set to 1135 / 25.4 mm. Weaving was performed using the same woven structure (woven structure 2). The apparent cover factor, inner surface exposure degree, and blood leakage of the inner surface of the artificial blood vessel thus obtained were evaluated. The results are shown in Table 3. The degree of exposure to the inner surface was zero, and the blood leakage was suppressed more than in Examples 1 to 4.
- Example 6 Of the two shuttles, weaving was performed using the same woven structure (woven structure 2) as in Example 4 except that polyethylene terephthalate monofilament yarn having a single yarn fineness of 22 dtex was prepared as the weft of the back shuttle. The apparent cover factor, inner surface exposure degree, and blood leakage of the inner surface of the artificial blood vessel thus obtained were evaluated. The results are shown in Table 3. The degree of exposure to the inner surface was zero, the blood leakage was equivalent to that of Example 4, the kink resistance was less likely to bend than Examples 1 to 5, and the artificial blood vessel was excellent in form retention.
- Example 1 An artificial blood vessel was obtained by the same method (woven tissue 2) as in Example 3 except that the total number of warps was 480/25 mm and the number of wefts was 1130 / 25.4 mm. The apparent cover factor, inner surface exposure degree, and blood leakage of the inner surface of the artificial blood vessel thus obtained were evaluated. The results are shown in Table 3. The blood leakage was high and impractical.
- Example 2 An artificial blood vessel was obtained by the same method (woven tissue 1) as in Example 1 except that the total number of warps was 480/25 mm and the number of wefts driven was 600 / 25.4 mm. The apparent cover factor, inner surface exposure degree, and blood leakage of the inner surface of the artificial blood vessel thus obtained were evaluated. The results are shown in Table 3. The blood leakage was remarkably high and was less practical than Comparative Example 1.
- the present invention is suitable as an artificial blood vessel for various surgical operations.
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Abstract
Description
本発明者は上記課題を解決するために、鋭意研究をした結果、本発明を完成するに至った。
(1)筒状多重織物構造からなる人工血管であって、血流と接触する内層を主に構成する経糸として、単糸繊度が0.5dtex以下のマイクロファイバーマルチフィラメント糸と、外層を主に構成する経糸として、単糸繊度が1.0dtex以上のマルチフィラメント糸の2種を用い、内層の見かけカバーファクターが2000以上であることを特徴とする人工血管である。
(3)内層の緯糸の少なくとも一部に単糸繊度が0.5dtex以下のマイクロファイバーマルチフィラメント糸を用いたことを特徴とする(1)記載の人工血管である。
(4)緯糸の少なくとも一部に単糸繊度が15dtex以上のモノフィラメント糸を用いたことを特徴とする(1)に記載の人工血管である。
マルチフィラメント糸が内面に露出すると、マイクロファイバーマルチフィラメント糸が内面に露出している場合に比較して血管内皮細胞の成長効果が小さい。また、露出したマルチフィラメントと隣接するマルチフィラメントとの間に隙間が生じやすく、漏血が生じ易くなる。さらに、血栓発生の起点になるため好ましくない。そこで、マルチフィラメント糸の内面露出度は20%以下であることが好ましく、5%以下であることがより好ましく、1%以下であることがさらに好ましい。
内層を構成する経糸および緯糸の各々が、単糸繊度0.50dtex以下のマイクロファイバーマルチフィラメントを含めば、内層の繊維間空隙は減少し、より漏血性を抑制出来る。また、それに加え、更に単糸繊度を0.4dtex以下にすることにより、血管内皮細胞が付着するに適した足場の数が極めて多くなるため、血管内皮細胞と人工血管内層構成繊維との馴染みがよく、血管内皮細胞の人工血管内層への張付き性がより良好となる。しかも、単糸繊度が0.5dtex以下のマイクロファイバーマルチフィラメントが経糸と緯糸の両方に含まれているので、人工血管内層へ張付いた血管内皮細胞は経糸および緯糸からなる繊維表面に沿って縦横無尽に成長して、人工血管の内側に血管内皮細胞の薄皮を形成することができる。内層の繊維間空隙は減少による低漏血性達成の観点から、内層を構成する経糸および緯糸の単糸繊度は、好ましくは0.5dtex以下であり、血管内皮細胞との張付き性の観点からは、内層を構成する経糸および緯糸の好ましい単糸繊度は0.4dtex以下であり、特に好ましくは0.3dtex以下、更に好ましくは、0.25dtex以下である。ただし、単糸繊度が0.008dtex以下となると、逆に細胞の付着性が阻害される傾向がある。したがって、内層を構成する経糸および緯糸の単糸繊度は、0.008dtex超であることが好ましく、より好ましくは単糸繊度は0.02dtex以上であることが好ましい。更に好ましくは内層を構成する経糸および緯糸の単糸繊度0.02dtexから0.25dtexが良く、特に0.05dtex~0.25dtexが良い。
緯糸の一部に単糸繊度15dtex以上のモノフィラメント糸を含むことにより、人工血管の形態保持性や伸縮性が向上し、折れ曲がりを抑えることができる(耐キンク性が向上する)。ただし、このモノフィラメント糸が太すぎると、剛直すぎて製織性が不安定となる。織機の種類や性能にもよるが、一般的には1000dtex以下が好ましい。また、本モノフィラメント糸を用いる場合は、耐キンク性の向上効果の観点から外層に用いるのがよい。
本発明の人工血管は、プレクロッティングを行う用途に用いることができるのは言うまでもない。
(1)単糸繊度
JIS L 101(2010)8.3.1 A法に従って、所定荷重0.045[cN/dtex]で正量繊度を測定して総繊度とし、それを単繊維数で除することで単糸繊度を算出した。
人工血管の長手方向に切り込みを入れて開き、内面の拡大写真を撮影する。図1は、その拡大写真である(150倍)。図2は、内層の見かけカバーファクターの求め方を説明するために、図1の要部を拡大した模式図である。図2に示すように、経糸および緯糸に平行な線を描いて単位面積(1mm×1mm)の正方形(図1では細線で囲まれた図形)を得、その正方形の内部にある経糸の織構造の山部を数え、その正方形から少しでもはみ出した山部は0.5とする。
CFd=[2C]1/2×2×[Dm]1/2
なお、図1のDmは56、CFdは2464である。
内面の見かけカバーファクターCFdの測定時に、任意に選んだ経糸山部100個のうち、単糸繊度が大きい(1.0dtex以上)マルチフィラメント糸が確認できる山部を数え、その山部の数値「Ma」を内面露出度(%)とする。
人工血管の両端部のうち、片側を塞いだ状態で、もう一方の片側に25℃の牛血液を含むチューブ類を設置し、人工血管の内側にかかる圧力が16kPaとなるような条件下で人工血管全体が十分含浸するまで20分間内側から外側に向けて牛血液を通した後、5分間の通液量(mL)を採取した。その通液量(mL)を人工血管の内表面積(cm2)および単位時間(min)で除した値を、16kPaにおける漏血量とした。
経糸として、単糸繊度が0.23dtex、総繊度が33dtex、144フィラメントのポリエチレンテレフタレートマイクロファイバーマルチフィラメント糸と、単糸繊度が2.33dtex、総繊度が56dtex、24フィラメントのポリエチレンテレフタレートマルチフィラメント糸を準備し、それぞれ1本糊付け機にて糊付けした。上記マイクロファイバーマルチフィラメント糸を2本、マルチフィラメント糸を1本の順で600本の経糸を幅25mmにて製経し、その経糸を細幅ドビー・シャトル二丁織機に仕掛けた。
緯糸に単糸繊度が0.46dtex、総繊度33dtex、72フィラメントのポリエチレンテレフタレートマルチフィラメント糸を準備し、緯糸打ち込み本数=750本/25.4mmの設定で下記の織組織(織組織1)を表わす表1にて製織した。
緯糸打ち込み本数=1450本/25.4mmの設定で下記の織組織(織組織2)を表わす表2にて製織した以外は実施例1と同じ方法にて人工血管を得た。これによって得られた人工血管の内層の見かけカバーファクター、内面露出度および漏血性を評価した。その結果を表3に示す。内面露出度はゼロであり、漏血性は実施例1にも増して抑制されたものであった。
緯糸に単糸繊度が0.23dtex、総繊度33dtex、144フィラメントのポリエチレンテレフタレートマイクロファイバーマルチフィラメント糸を用いた以外は実施例2と同じ方法(織組織2)にて人工血管を得た。これによって得られた人工血管の内面の見かけカバーファクター、内面露出度および漏血性を評価した。その結果を表3に示す。内面露出度はゼロであり、漏血性は実施例2にも増して抑制されたものであった。
経糸として、単糸繊度が0.30dtex、総繊度が44dtex、144フィラメントのポリエチレンテレフタレートマイクロファイバーマルチフィラメント糸と単糸繊度が2.33dtex、総繊度が56dtex、24フィラメントのポリエチレンテレフタレートマルチフィラメント糸を準備し、緯糸に単糸繊度が0.30tex、総繊度44dtex、144フィラメントのポリエチレンテレフタレートマイクロファイバーマルチフィラメント糸を準備し、緯糸打ち込み本数=1250本/25.4mmの設定とした以外は実施例2と同じ織組織(織組織2)にて製織した。これによって得られた人工血管の内面の見かけカバーファクター、内面露出度および漏血性を評価した。その結果を表3に示す。内面露出度はゼロであり、漏血性は実施例1、2にも増して抑制されたものであった。
経糸として、単糸繊度が0.084dtex、総繊度が53dtex、630フィラメントのポリエチレンテレフタレートマイクロファイバーマルチフィラメント糸と単糸繊度が2.33dtex、総繊度が56dtex、24フィラメントのポリエチレンテレフタレートマルチフィラメント糸を準備し、緯糸に単糸繊度が0.084dtex、総繊度が53dtex、630フィラメントのポリエチレンテレフタレートマイクロファイバーマルチフィラメント糸を準備し、緯糸打ち込み本数=1135本/25.4mmの設定とした以外は実施例2と同じ織組織(織組織2)にて製織した。これによって得られた人工血管の内面の見かけカバーファクター、内面露出度および漏血性を評価した。その結果を表3に示す。内面露出度はゼロであり、漏血性は実施例1~4にも増して抑制されたものであった。
2丁のシャトルのうち、奥側シャトルの緯糸として単糸繊度が22dtexのポリエチレンテレフタレートモノフィラメント糸を準備した以外は、実施例4と同じ織組織(織組織2)にて製織した。これによって得られた人工血管の内面の見かけカバーファクター、内面露出度および漏血性を評価した。その結果を表3に示す。内面露出度はゼロであり、漏血性は実施例4と同等であり、耐キンク性に関しては実施例1~5よりも折れ曲がり難く、形態保持性に優れた人工血管であった。
経糸の総本数を480本/25mmとし、緯糸打ち込み本数を1130本/25.4mmとしたこと以外は実施例3と同じ方法(織組織2)にて人工血管を得た。これによって得られた人工血管の内面の見かけカバーファクター、内面露出度および漏血性を評価した。その結果を表3に示す。漏血性は高く、実用性のないものであった。
経糸の総本数を480本/25mmとし、緯糸打ち込み本数を600本/25.4mmとしたこと以外は実施例1と同じ方法(織組織1)にて人工血管を得た。これによって得られた人工血管の内面の見かけカバーファクター、内面露出度および漏血性を評価した。その結果を表3に示す。漏血性は著しく高く、比較例1以上に実用性のないものであった。
Claims (4)
- 筒状多重織物構造からなる人工血管であって、血流と接触する内層を主に構成する経糸として、単糸繊度が0.5dtex以下のマイクロファイバーマルチフィラメント糸と、外層を主に構成する経糸として、単糸繊度が1.0dtex以上のマルチフィラメント糸の2種を用い、内層の見かけカバーファクターが2000以上であることを特徴とする人工血管。
- 前記マルチフィラメント糸の内面露出度が20%以下であることを特徴とする請求項1記載の人工血管。
- 内層の緯糸の少なくとも一部に単糸繊度が0.5dtex以下のマイクロファイバーマルチフィラメント糸を用いたことを特徴とする請求項1記載の人工血管。
- 緯糸の少なくとも一部に単糸繊度が15dtex以上のモノフィラメント糸を用いたことを特徴とする請求項1に記載の人工血管。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/105,107 US20160317272A1 (en) | 2013-12-18 | 2014-12-16 | Vascular prosthesis |
| JP2015553554A JPWO2015093480A1 (ja) | 2013-12-18 | 2014-12-16 | 人工血管 |
| KR1020167014763A KR20160099547A (ko) | 2013-12-18 | 2014-12-16 | 인공혈관 |
| RU2016128718A RU2675113C1 (ru) | 2013-12-18 | 2014-12-16 | Сосудистый протез |
| EP14871178.1A EP3085335A4 (en) | 2013-12-18 | 2014-12-16 | Artificial blood vessel |
| CA2933676A CA2933676A1 (en) | 2013-12-18 | 2014-12-16 | Vascular prothesis |
| AU2014367836A AU2014367836A1 (en) | 2013-12-18 | 2014-12-16 | Vascular prothesis |
| CN201480065691.1A CN105764446B (zh) | 2013-12-18 | 2014-12-16 | 人工血管 |
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| JP2013261755 | 2013-12-18 |
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| EP (1) | EP3085335A4 (ja) |
| JP (1) | JPWO2015093480A1 (ja) |
| KR (1) | KR20160099547A (ja) |
| CN (1) | CN105764446B (ja) |
| AU (1) | AU2014367836A1 (ja) |
| CA (1) | CA2933676A1 (ja) |
| RU (1) | RU2675113C1 (ja) |
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| WO (1) | WO2015093480A1 (ja) |
Cited By (3)
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| CN105311674A (zh) * | 2015-11-18 | 2016-02-10 | 武汉纺织大学 | 一种高弹性抗折皱人造血管制备方法 |
| WO2016024441A1 (ja) * | 2014-08-12 | 2016-02-18 | 東レ株式会社 | 人工血管 |
| JP2022013768A (ja) * | 2020-06-29 | 2022-01-18 | 株式会社ハイレックスコーポレーション | 人工血管 |
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| CA2935808C (en) * | 2014-02-12 | 2018-08-21 | Toray Industries, Inc. | Artificial blood vessel |
| US20230277292A1 (en) * | 2020-06-29 | 2023-09-07 | Hi-Lex Corporation | Artificial blood vessel |
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- 2014-12-16 CA CA2933676A patent/CA2933676A1/en not_active Abandoned
- 2014-12-16 JP JP2015553554A patent/JPWO2015093480A1/ja active Pending
- 2014-12-16 KR KR1020167014763A patent/KR20160099547A/ko not_active Withdrawn
- 2014-12-16 WO PCT/JP2014/083266 patent/WO2015093480A1/ja not_active Ceased
- 2014-12-16 US US15/105,107 patent/US20160317272A1/en not_active Abandoned
- 2014-12-16 RU RU2016128718A patent/RU2675113C1/ru not_active IP Right Cessation
- 2014-12-16 EP EP14871178.1A patent/EP3085335A4/en not_active Withdrawn
- 2014-12-16 CN CN201480065691.1A patent/CN105764446B/zh not_active Expired - Fee Related
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| JP2022013768A (ja) * | 2020-06-29 | 2022-01-18 | 株式会社ハイレックスコーポレーション | 人工血管 |
| JP7425770B2 (ja) | 2020-06-29 | 2024-01-31 | 株式会社ハイレックスコーポレーション | 人工血管 |
Also Published As
| Publication number | Publication date |
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| TW201529057A (zh) | 2015-08-01 |
| RU2675113C1 (ru) | 2018-12-17 |
| EP3085335A4 (en) | 2017-07-19 |
| KR20160099547A (ko) | 2016-08-22 |
| CA2933676A1 (en) | 2015-06-25 |
| CN105764446B (zh) | 2017-11-24 |
| CN105764446A (zh) | 2016-07-13 |
| AU2014367836A2 (en) | 2016-08-25 |
| US20160317272A1 (en) | 2016-11-03 |
| TWI632899B (zh) | 2018-08-21 |
| RU2016128718A (ru) | 2018-01-23 |
| JPWO2015093480A1 (ja) | 2017-03-16 |
| AU2014367836A1 (en) | 2016-06-16 |
| EP3085335A1 (en) | 2016-10-26 |
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