Dr BP van der Wal, Merit Medical Coatings ndi Charles Fields, Whitford Corporation, akukambirana za kugwiritsa ntchito zokutira za PTFE pazida zamankhwala za intravascular.
Pakhala pali zokambirana zambiri za zokutira za PTFE pamsika wa zida zamankhwala zam'magazi.Mu Novembala, 2015 a FDA adapereka njira yolumikizirana yotetezeka yofotokoza zotsatira za zokutira delamination pazida zam'mitsempha pazidendene za zochitika zingapo zomwe zanenedwa.Kwa zaka zambiri, zokutira za PTFE zakhala zibwenzi zopanda pake, zomwe zimachepetsa mikangano tsiku lililonse pamachitidwe a catheterization.Zakhala zopezeka paliponse, zomaliza pazigawo zokhazikika za catheter.
Kupanikizika kosalekeza kwamakampani opanga mankhwala kumakakamiza kusintha.Owerenga angakumbukire kuti PFOA (Perfluorooctanic acid) idayendetsedwa kuchokera kumayendedwe a fluoropolymer.Kusintha kumeneku kunali ndi zotsatira pa ntchito yotchinga komanso zofunikira pakugwiritsa ntchito.Izi sizachilendo.Opanga zokutira nthawi zonse amakakamizika kuthana ndi kusintha kwazinthu zopangira kuphatikiza zosungunulira, ma pigment, ndi resins.Izi sizikusakanikirana bwino ndi msika wa zida zamankhwala.Ngakhale makampani opanga zida zamankhwala ali ndi njira zothanirana ndi kusintha kwa zinthu, nthawi zambiri zimakhala zotengera nthawi komanso zodula kuti zitheke.Zosinthazi zikuwoneka kuti zikuchulukirachulukira pomwe zofunikira zapadziko lonse zazinthu zobiriwira komanso zotetezeka zimakhala zoyendetsa kwambiri.Zida zamakono zomwe zikuwunikidwa zikuphatikiza Chrome 6 (hexavalent chromium) ndi NMP (N-methyl-2-pyrrolidone).Izi ndizofunika kwambiri popanga zokutira zambiri za fluoropolymer (PTFE) zomwe zimagwiritsidwa ntchito pazigawo za catheter.Opanga zida zamankhwala zam'mitsempha adzafunika kukonzekera kuti agwirizane ndi kusintha kwa zokutirazi kuti awonetsetse kuti njira zokutira zikukwaniritsa zofunikira zawo zomaliza.
Merit Medical Coatings, omwe malo awo okutira mawaya ali ku Venlo, Netherlands, akhala akuyesetsa kuthana ndi zovuta zomwe zimayikidwa pamakampani a fluoropolymer.Dr BP van der Wal, mainjiniya wamkulu adati: "Kugwiritsa ntchito zokutira (PTFE) pamawaya azachipatala kumafuna ukadaulo wambiri.Kukula kwakung'ono ndi kusinthasintha kwa zida zambiri zachipatala kumapangitsa kuti ❖ kuyanika kukhala kovuta komanso kosiyana kotheratu ndi njira yophikira ya magawo athyathyathya komanso olimba monga zophikira.Kutentha kochepa kwambiri kwa magawo monga mawaya kumafuna nthawi yosinthira ndi kutentha kosiyanasiyana. ”
Pali njira ziwiri zosiyana zogwiritsira ntchito zokutira: Pre-coating ndi post-coating.Pokonzekera chisanadze, chophimbacho chimagwiritsidwa ntchito ku gawo lapansi musanayambe msonkhano.Nthawi zambiri, njira yophikira isanakwane imagwiritsidwa ntchito pokonza kuchuluka kwa voliyumu komwe gawo lapansi limalola kukonza kwa reel-to-reel.Kuphimba koyambirira ndi njira yopitilira yomwe imalola kuthamanga kwapamwamba kwambiri komanso zotsatira zofananira zokhala ndi reel yazinthu zonse.Kwa mawaya owongolera, izi zikutanthauza kuti zokutira zimayikidwa pawaya munjira ya reel-to-reel musanapiringire.Chophimbacho chiyenera kulimbana ndi mphamvu zonse zomwe zimagwiritsidwa ntchito pokonzekera msonkhano.Mwachitsanzo, zokutira siziyenera kutsika kuchokera ku waya panthawi yozungulira.Izi zimafuna zambiri kuchokera ku zokutira chifukwa cha mphamvu zazikulu zomwe zimagwiritsidwa ntchito pawaya ndi zotsatira zake.Ma parameters monga makulidwe okutirira ndi ofunikira kuti zokutirazo zikhale zosinthika komanso zolimba mokwanira.
Pophimba pambuyo, njira zopangira waya wa catheter zatha kale.Kuphimba pambuyo ndi ndondomeko ya batch ndipo imasankhidwa ngati gawo lapansi silingalole kukonza reel-to-reel, monga waya wokhala ndi nsonga ya pansi.Kuphimba pambuyo kumaperekanso kusinthasintha kwakukulu kuti mungovala gawo la gawo lapansi.Pophimba gawo la gawo lapansi, zolembera zimatha kusiyidwa pamwamba.Wotsatira youma filimu alibe kupirira mkulu mawotchi mphamvu ya koyilo ndi zina waya kupanga njira.Izi sizimapangitsa kuti ntchito yopaka ikhale yovuta kwambiri.Ndi chisanadze ❖ kuyanika ndondomeko ❖ kuyanika adhesion kulephera ankaona pa msonkhano ndondomeko.Ndi pambuyo ❖ kuyanika ndondomeko ❖ kuyanika adhesion kulephera zikhoza kuchitika pa kukhudzana odwala ngati si anagwidwa pa QA-kuwunika.Izi zitha kukhala zowopsa zomwe zimayika zofunikira kwambiri pazogwiritsa ntchito zokutira.
Kwa zokutira za fluoropolymer, katundu wopanda ndodo ndi kumamatira kwabwino kwa gawo lapansi zimatsutsana.Kuphatikiza apo, mawaya azachipatala nthawi zambiri amapangidwa ndi zitsulo zosapanga dzimbiri, monga 304 zitsulo zosapanga dzimbiri ndi Nitinol, zomwe zimasokoneza njira zotenthetsera ndi kukonza.Nthawi zambiri zokutira zosanjikiza zambiri zimagwiritsidwa ntchito kuti agwirizane bwino ndi gawo lapansi pogwiritsa ntchito chomangira ndi malaya olemera a fluoropolymer.Zachidziwikire, izi zimapangitsa kuti ntchito yokutira ikhale yovuta kwambiri chifukwa zigawo zingapo ziyenera kuyikidwa.Pakhala pali zokutira zatsopano zambiri zomwe zida zachijasi chimodzi zidapangidwa zomwe zimapereka zotsatira zofanana: kumamatira bwino ku gawo lapansi ndi topcoat yolemera ya fluoropolymer.Njira yokutira, komabe, imakhudza kwambiri magwiridwe antchito amtunduwu.
Nthawi yotumiza: Jul-01-2017