{"id":3216,"date":"2020-09-10T02:03:46","date_gmt":"2020-09-10T02:03:46","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=3216"},"modified":"2026-04-28T10:41:46","modified_gmt":"2026-04-28T10:41:46","slug":"artificial-blood-vessel-material","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/pt\/artificial-blood-vessel-material\/","title":{"rendered":"Material para vasos sangu\u00edneos artificiais"},"content":{"rendered":"<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">O sistema circulat\u00f3rio do sangue humano inclui tr\u00eas partes: sangue, vasos sangu\u00edneos e cora\u00e7\u00e3o. Os vasos sangu\u00edneos servem como pontes para conectar os \u00f3rg\u00e3os e o cora\u00e7\u00e3o em s\u00e9rie e fornecem canais para o fluxo de sangue para transportar nutrientes para v\u00e1rias partes do corpo. Por isso, muitas vezes eles s\u00e3o chamados coletivamente de sistema cardiovascular. As les\u00f5es que ocorrem nessas \u00e1reas s\u00e3o chamadas de doen\u00e7as cardiovasculares. A doen\u00e7a cardiovascular \u00e9 a doen\u00e7a mais comum que amea\u00e7a a sa\u00fade humana, e sua incid\u00eancia ocupa o primeiro lugar entre as v\u00e1rias doen\u00e7as no mundo. Atualmente, ocorrem cerca de 2,6 milh\u00f5es de mortes por doen\u00e7as cardiovasculares e cerebrovasculares em meu pa\u00eds a cada ano, com uma m\u00e9dia de cerca de 300 mortes por hora. \u00c0 medida que a popula\u00e7\u00e3o do nosso pa\u00eds envelhece, a incid\u00eancia, a recorr\u00eancia e a mortalidade dessas doen\u00e7as continuar\u00e3o a aumentar. Isso tem causado um pesado \u00f4nus econ\u00f4mico e espiritual para a sociedade e a fam\u00edlia.<\/h4>\n\n<!-- lc-qa-start -->\n<p><strong>Quick answer:<\/strong> A strong printing-ink formulation is usually the one that keeps process stability and final print quality in balance, rather than over-optimizing only one part of the press behavior.<\/p>\n<!-- lc-qa-end -->\n\n\n\n\n\n\n<h3 class=\"wp-block-heading\">As causas das doen\u00e7as cardiovasculares s\u00e3o divididas principalmente em duas categorias:<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">1. As altera\u00e7\u00f5es patol\u00f3gicas da fun\u00e7\u00e3o dos vasos sangu\u00edneos causadas pelo envelhecimento fisiol\u00f3gico dos \u00f3rg\u00e3os humanos.<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Por exemplo, a aterosclerose leva ao estreitamento e \u00e0 oclus\u00e3o das art\u00e9rias, a derrames causados pela aterosclerose da car\u00f3tida, a doen\u00e7as card\u00edacas causadas pela aterosclerose coronariana etc. Essas doen\u00e7as ocorrem principalmente em idosos;<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">2. Doen\u00e7a vascular causada por les\u00e3o ou doen\u00e7a do tecido humano.<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Por exemplo, o corte com ferramentas afiadas leva a danos e ruptura de art\u00e9rias e veias, aneurisma da aorta renal, aneurisma il\u00edaco e vasodilata\u00e7\u00e3o causada pela expans\u00e3o do aneurisma da aorta tor\u00e1cica descendente. Quando os vasos sangu\u00edneos n\u00e3o podem funcionar normalmente devido \u00e0 arteriosclerose, ao envelhecimento ou a danos, s\u00e3o necess\u00e1rios procedimentos cir\u00fargicos como transplante, bypass ou interven\u00e7\u00e3o para usar substitutos de vasos sangu\u00edneos para tratamento.<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">Um material ideal para vasos sangu\u00edneos artificiais, como um implante permanente para o corpo humano, deve primeiramente ter boa biocompatibilidade, inclusive:<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">1. N\u00e3o pode causar imunidade anormal, rejei\u00e7\u00e3o e rea\u00e7\u00f5es al\u00e9rgicas;<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">2. Nenhuma rea\u00e7\u00e3o adversa \u00e0 fun\u00e7\u00e3o de crescimento celular, nenhum efeito teratog\u00eanico ou de gemina\u00e7\u00e3o;<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">3. N\u00e3o \u00e9 t\u00f3xico, n\u00e3o danifica os tecidos vizinhos, n\u00e3o induz tumores, n\u00e3o causa coagula\u00e7\u00e3o, hem\u00f3lise, desnatura\u00e7\u00e3o das prote\u00ednas do sangue e danos \u00e0s plaquetas, etc;<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">4. \u00c9 quimicamente inerte, n\u00e3o causa desnatura\u00e7\u00e3o devido \u00e0 influ\u00eancia do sangue e dos fluidos corporais e n\u00e3o apresenta biodegrada\u00e7\u00e3o anormal que leve \u00e0 perda de resist\u00eancia;<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">5. Ap\u00f3s o implante, a fun\u00e7\u00e3o do material n\u00e3o ser\u00e1 danificada, n\u00e3o ser\u00e1 afetada pela influ\u00eancia biol\u00f3gica e pelo envelhecimento, poder\u00e1 suportar altera\u00e7\u00f5es f\u00edsicas causadas por exerc\u00edcios e n\u00e3o absorver\u00e1 sedimentos.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">6. Em segundo lugar, para poder suportar a for\u00e7a recebida durante e ap\u00f3s o implante, garantir a permeabilidade dos vasos sangu\u00edneos a longo prazo e suportar a press\u00e3o pulsante peri\u00f3dica causada pela press\u00e3o sist\u00f3lica e diast\u00f3lica, o enxerto tamb\u00e9m deve ter propriedades mec\u00e2nicas correspondentes, resist\u00eancia suficiente \u00e0 fadiga e o vaso sangu\u00edneo artificial deve ser semelhante ao vaso sangu\u00edneo substitu\u00eddo.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">A anastomose entre o vaso sangu\u00edneo artificial e o vaso sangu\u00edneo hospedeiro \u00e9 feita por suturas. Portanto, o vaso sangu\u00edneo artificial deve ter uma certa resist\u00eancia de costura para garantir que a borda possa suportar a carga de tra\u00e7\u00e3o da linha cir\u00fargica durante a opera\u00e7\u00e3o de transplante e n\u00e3o se rompa nem se solte.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">O produto acabado do vaso sangu\u00edneo artificial deve ter v\u00e1rios formatos e tamanhos, pode ser esterilizado e \u00e9 f\u00e1cil de manusear e suturar durante a cirurgia. Seu tamanho e forma devem ser est\u00e1veis, resistentes \u00e0 tra\u00e7\u00e3o, flex\u00e3o e compress\u00e3o, e podem retornar rapidamente \u00e0 sua forma original ap\u00f3s serem deformados por for\u00e7a externa. A superf\u00edcie externa do vaso sangu\u00edneo artificial deve ter um certo grau de rugosidade para facilitar a fixa\u00e7\u00e3o e o crescimento das c\u00e9lulas adjacentes. Ao mesmo tempo, a parede do tubo deve ter uma porosidade adequada, o que pode n\u00e3o apenas impedir a penetra\u00e7\u00e3o do sangue, mas tamb\u00e9m permitir a passagem de pequenas mol\u00e9culas.<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\">Em resumo, para vasos sangu\u00edneos artificiais. Os materiais usados devem ter os seguintes requisitos b\u00e1sicos:<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">(1) O material deve ter resist\u00eancia mec\u00e2nica suficiente e ser absolutamente seguro para suportar a pulsa\u00e7\u00e3o da press\u00e3o arterial por um longo per\u00edodo;<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">(2) O material tem boa biocompatibilidade e propriedades anticoagulantes;<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">(3) O material tem a capacidade de resistir \u00e0 ades\u00e3o bacteriana e evitar infec\u00e7\u00f5es;<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">(4) A flexibilidade e a elasticidade do material s\u00e3o compat\u00edveis com o vaso sangu\u00edneo humano;<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">(5) O material \u00e9 poroso para facilitar o crescimento das c\u00e9lulas endoteliais;<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">(6) F\u00e1cil opera\u00e7\u00e3o.<\/h4>\n\n\n\n<p>                        <\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Atualmente, os materiais para vasos sangu\u00edneos artificiais usados na medicina cl\u00ednica incluem principalmente poli\u00e9ster, politetrafluoretileno, poliuretano e seda natural. Entre eles, o material de seda de amoreira natural pura n\u00e3o \u00e9 est\u00e1vel o suficiente devido ao seu encolhimento em espiral, o que pode facilmente causar colapso vascular e m\u00e1 reten\u00e7\u00e3o da forma. Ele n\u00e3o \u00e9 mais usado sozinho na pr\u00e1tica cl\u00ednica.<\/h4>\n\n\n\n<p>                <\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Quando o poli\u00e9ster \u00e9 usado como material biom\u00e9dico, suas propriedades biomec\u00e2nicas, estabilidade qu\u00edmica e biocompatibilidade s\u00e3o melhores do que outros materiais polim\u00e9ricos, mas sua compatibilidade com o sangue \u00e9 ruim, a superf\u00edcie \u00e9 f\u00e1cil de coagular e sua decomposi\u00e7\u00e3o \u00e9 ruim, e \u00e9 dif\u00edcil ser completamente decomposto e digerido pelo corpo. absorver. O material de poli\u00e9ster tem uma superf\u00edcie lisa, mol\u00e9culas internas bem organizadas, boa resist\u00eancia ao desgaste e \u00e0 luz, resist\u00eancia \u00e0 corros\u00e3o \u00e1cida e alcalina, alta resist\u00eancia, boa elasticidade, resist\u00eancia ao calor e estabilidade t\u00e9rmica melhores do que outras fibras sint\u00e9ticas. Devido \u00e0 estrutura molecular sim\u00e9trica e \u00e0 alta cristalinidade, n\u00e3o h\u00e1 nenhum grupo de alta polaridade na estrutura macromolecular, de modo que a hidrofilicidade e a absor\u00e7\u00e3o de umidade s\u00e3o fracas. Embora a estrutura pouco hidrof\u00edlica tenha alta permeabilidade aos fluidos do corpo humano, ela pode limitar a dire\u00e7\u00e3o do fluido do tecido. O material penetra no interior, mas \u00e9 f\u00e1cil causar rea\u00e7\u00f5es adversas, como coagula\u00e7\u00e3o e trombose.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">Quando os vasos sangu\u00edneos artificiais de Dacron entram em contato com o sangue, al\u00e9m da adsor\u00e7\u00e3o de prote\u00ednas sol\u00faveis pela parede do tubo, a ades\u00e3o de plaquetas, a forma\u00e7\u00e3o de co\u00e1gulos e a interven\u00e7\u00e3o da fibrina se tornar\u00e3o uma nova interface na cavidade do material do enxerto.<\/h4>\n\n\n\n<p>                                                  <\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Essa interface especial de fluxo sangu\u00edneo n\u00e3o s\u00f3 n\u00e3o favorece a cicatriza\u00e7\u00e3o do tecido, como tamb\u00e9m \u00e9 uma superf\u00edcie fluida propensa a trombose, e o risco de uso prolongado em baixas taxas de fluxo sangu\u00edneo \u00e9 maior. Portanto, o vaso sangu\u00edneo artificial de poli\u00e9ster \u00e9 adequado para a substitui\u00e7\u00e3o de grandes vasos sangu\u00edneos, mas n\u00e3o \u00e9 o melhor material para a substitui\u00e7\u00e3o de pequenos vasos sangu\u00edneos no corpo.<\/h4>\n\n\n\n<p>                               <\/p>\n\n\n\n<h4 class=\"wp-block-heading\">O PTFE tem excelente resist\u00eancia qu\u00edmica, resist\u00eancia a altas e baixas temperaturas, resist\u00eancia ao envelhecimento, baixo atrito, propriedades diel\u00e9tricas, propriedades antiaderentes e in\u00e9rcia fisiol\u00f3gica, o que faz com que seja usado em muitos campos, como ind\u00fastria qu\u00edmica, maquin\u00e1rio, el\u00e9trica, constru\u00e7\u00e3o e tratamento m\u00e9dico. Tornou-se um material especial indispens\u00e1vel. Devido \u00e0 sua excelente biocompatibilidade, raramente produz co\u00e1gulos sangu\u00edneos e \u00e9 adequado para ser implantado em vasos sangu\u00edneos artificiais humanos. Eles podem ser combinados com tecidos humanos por um longo per\u00edodo, t\u00eam boa permeabilidade ao sangue e possuem uma estrutura microporosa que permite que os tecidos naturais cres\u00e7am e se desenvolvam. Metabolismo celular. Nos vasos sangu\u00edneos artificiais de di\u00e2metro m\u00e9dio e pequeno, no passado, o politetrafluoroetileno expandido moldado integralmente (ePTFE) era usado principalmente.<\/h4>\n\n\n\n<p>                                          <\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Os materiais de poliuretano (PU) t\u00eam atra\u00eddo muita aten\u00e7\u00e3o nos \u00faltimos anos porque t\u00eam boa complac\u00eancia e elasticidade, al\u00e9m de excelentes propriedades antitromb\u00f3ticas. Em compara\u00e7\u00e3o com os vasos sangu\u00edneos de ePTFE, os experimentos mostram que os vasos sangu\u00edneos de PU realizam a endoteliza\u00e7\u00e3o em um tempo mais curto, e a espessura da neo\u00edntima \u00e9 obviamente maior do que a dos vasos sangu\u00edneos de ePTFE. O poliuretano tem alta elasticidade, alto m\u00f3dulo e boa compatibilidade com o sangue. Como material prot\u00e9tico, ele pode ser compat\u00edvel com a art\u00e9ria hospedeira. Embora o poliuretano tenha um certo grau de hidr\u00f3lise e possa ocorrer calcifica\u00e7\u00e3o dentro e fora do material, o que afeta a elasticidade, ele ainda \u00e9 um material ideal para vasos sangu\u00edneos artificiais de pequeno di\u00e2metro.<\/h4>\n\n\n\n<p>                           <\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Atualmente, os vasos sangu\u00edneos artificiais de grande calibre obtiveram bons resultados em aplica\u00e7\u00f5es cl\u00ednicas, mas os vasos sangu\u00edneos artificiais de pequeno calibre n\u00e3o conseguiram atender aos requisitos de uso cl\u00ednico devido \u00e0 forma\u00e7\u00e3o de trombos e se tornaram o foco das pesquisas no campo vascular. Com o aprofundamento da pesquisa, diversos materiais naturais e sint\u00e9ticos come\u00e7aram a ser usados em vasos sangu\u00edneos artificiais de pequeno calibre, como a modifica\u00e7\u00e3o da superf\u00edcie de materiais como o poli\u00e9ster, o uso de materiais compostos e a aplica\u00e7\u00e3o da tecnologia de tecelagem multicamada. Alguns pesquisadores usam a tecnologia de implanta\u00e7\u00e3o de c\u00e9lulas endoteliais para endotelizar vasos sangu\u00edneos artificiais, ou seja, c\u00e9lulas endoteliais vasculares aut\u00f3logas s\u00e3o plantadas na parede do l\u00famen de vasos sangu\u00edneos artificiais. Ap\u00f3s a cultura do tecido, forma-se uma superf\u00edcie de cavidade endotelial para aumentar a capacidade antitromb\u00f3tica e desenvolver uma nova forma de pesquisa de vasos sangu\u00edneos artificiais.<\/h4>\n\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Atualmente, os vasos sangu\u00edneos artificiais n\u00e3o podem substituir perfeitamente os vasos sangu\u00edneos biol\u00f3gicos, mas a origem dos vasos sangu\u00edneos biol\u00f3gicos e a rejei\u00e7\u00e3o de corpos estranhos limitam sua aplica\u00e7\u00e3o em larga escala. Portanto, os vasos sangu\u00edneos artificiais sempre ser\u00e3o um material importante para o tratamento de doen\u00e7as vasculares. Agora, a pesquisa de materiais sobre vasos sangu\u00edneos artificiais est\u00e1 cada vez mais inclinada \u00e0 bioqu\u00edmica e \u00e0 composi\u00e7\u00e3o com diversos materiais para torn\u00e1-los mais semelhantes aos organismos, ou para orientar os organismos a desenvolver novos vasos sangu\u00edneos, de modo a obter efeitos de tratamento semelhantes aos dos vasos sangu\u00edneos biol\u00f3gicos.<\/h4>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Entre em contato conosco agora!<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Aceitamos servi\u00e7os personalizados e, normalmente, entraremos em contato com voc\u00ea dentro de 24 horas. Voc\u00ea tamb\u00e9m pode me enviar um e-mail para info@longchangchemical.com durante o hor\u00e1rio comercial (das 8h30 \u00e0s 18h UTC+8 de segunda a s\u00e1bado) ou usar o bate-papo ao vivo do site para obter uma resposta r\u00e1pida.<\/h4>\n\n\n\n<h4 class=\"wp-block-heading\">Este artigo foi escrito pelo Departamento de P&amp;D da Longchang Chemical. Se voc\u00ea precisar copiar e reimprimir, indique a fonte<\/h4>\n\n\n<!-- lc-commercial-start -->\n<h2>A practical formulation view of printing and ink-processing topics<\/h2>\n<p>Ink performance problems are often multi-variable problems. Teams generally move faster when they screen transfer, flow, drying or curing, and substrate hold together instead of changing one raw material at a time without a clear decision frame.<\/p>\n<ul>\n<li><strong>Define the real process bottleneck:<\/strong> poor transfer, drying problems, skinning, and color instability often need different corrective routes.<\/li>\n<li><strong>Check viscosity inside the print process:<\/strong> an ink that looks fine in the container can behave very differently on the machine.<\/li>\n<li><strong>Review substrate compatibility:<\/strong> paper, film, metalized surfaces, and laminates often require different balance points.<\/li>\n<li><strong>Use post-print checks as part of selection:<\/strong> scratch resistance, tape adhesion, lamination behavior, and storage stability are usually as important as the fresh-print appearance.<\/li>\n<\/ul>\n<h3>Recommended product references<\/h3>\n<ul>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/photoinitiator-lap-cas-85073-19-4\/\">CHLUMINIT LAP<\/a>:<\/strong> A strong option when blue-light response or advanced curing windows are under review.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiaf-094\/\">CHLUMIAF 094<\/a>:<\/strong> A balanced defoamer reference for waterborne coatings and many general foam-control screens.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiaf-3037\/\">CHLUMIAF 3037<\/a>:<\/strong> A stronger process-defoaming option when persistent foam survives harsher conditions.<\/li>\n<li><strong><a href=\"https:\/\/longchangchemical.com\/pt\/product\/chlumiwe-3280\/\">CHLUMIWE 3280<\/a>:<\/strong> A strong wetting-agent reference for inks, coatings, and difficult substrate wetting.<\/li>\n<\/ul>\n<h3>FAQ for buyers and formulators<\/h3>\n<p><strong>Why do many ink problems require more than one formulation change?<\/strong><br \/>Because flow, transfer, drying, adhesion, and appearance interact, so improving one of them can sometimes worsen another if the full system is not reviewed together.<\/p>\n<p><strong>Should rheology be judged only by a single viscosity number?<\/strong><br \/>Not usually. Printability also depends on transfer behavior, temperature, shear history, and how the ink behaves on the actual press.<\/p>\n<!-- lc-commercial-end -->","protected":false},"excerpt":{"rendered":"<p>The human blood circulatory system includes three parts: blood, blood vessels, and heart. The blood vessels serve as bridges to connect organs and the heart in series, and provide channels<\/p>","protected":false},"author":1,"featured_media":3217,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3216","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Artificial blood vessel material - Longchang Chemical<\/title>\n<meta name=\"description\" content=\"The human blood circulatory system includes three parts: blood, blood vessels, and heart. 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