Ngakhale PTFE (polytetrafluoroethylene) ndiePTFE(polytetrafluoroethylene yowonjezeredwa) ili ndi maziko ofanana a mankhwala, ili ndi kusiyana kwakukulu mu kapangidwe kake, magwiridwe antchito ndi malo ogwiritsira ntchito.
Kapangidwe ka mankhwala ndi zinthu zoyambira
PTFE ndi ePTFE zonse zimapangidwa ndi polymer kuchokera ku tetrafluoroethylene monomers, ndipo zonse ziwiri zili ndi formula ya mankhwala (CF₂-CF₂)ₙ, zomwe sizigwira ntchito bwino ndi mankhwala ndipo sizimakhudzidwa ndi kutentha kwambiri. PTFE imapangidwa ndi kutentha kwambiri, ndipo maunyolo a mamolekyu amakonzedwa bwino kuti apange kapangidwe kolimba, kopanda mabowo. ePTFE imagwiritsa ntchito njira yapadera yotambasula kuti ipange PTFE fiberize pa kutentha kwakukulu kuti ipange kapangidwe ka maukonde okhala ndi mabowo a 70%-90%.
Kuyerekeza kwa makhalidwe enieni
| Mawonekedwe | PTFE | ePTFE |
| Kuchulukana | Wapamwamba (2.1-2.3 g/cm³) | Yotsika (0.1-1.5 g/cm³) |
| Kutha kupirira | Palibe kulowererapo (kolimba kwambiri) | Kuchuluka kwa mpweya wolowa m'malo (ma micropores amalola kufalikira kwa mpweya) |
| Kusinthasintha | Yolimba komanso yofooka | Kusinthasintha kwakukulu ndi kusinthasintha |
| Mphamvu ya makina | Mphamvu yolimba kwambiri, kukana misozi pang'ono | Kulimba kwa misozi kwakula kwambiri |
| Kuyenda pang'onopang'ono | Palibe ma pores | Kuchuluka kwa porosity kumatha kufika 70% -90% |
Makhalidwe ogwira ntchito
●PTFE: Ndi yopanda mankhwala ndipo imalimbana ndi ma asidi amphamvu, ma alkali amphamvu ndi zosungunulira zachilengedwe, imakhala ndi kutentha kwa -200°C mpaka +260°C, ndipo imakhala ndi dielectric constant yotsika kwambiri (pafupifupi 2.0), zomwe zimapangitsa kuti ikhale yoyenera kutetezedwa kwa ma circuit circuit amphamvu.
● ePTFE: Kapangidwe ka ma microporous kamakhala ndi mphamvu zosalowa madzi komanso zopumira (monga mfundo ya Gore-Tex), ndipo kamagwiritsidwa ntchito kwambiri mu ma implants azachipatala (monga ma patches a mitsempha yamagazi). Kapangidwe ka ma porous ndi koyenera kutseka ma gasket (kubwerera m'mbuyo pambuyo pokanikiza kuti mudzaze mpata).
Zochitika zachizolowezi zogwiritsira ntchito
● PTFE: Yoyenera kutetezedwa ndi chingwe chotentha kwambiri, zokutira zodzoladzola zonyamula mafuta, mapaipi a mankhwala, ndi mapaipi a reactor oyeretsedwa kwambiri mumakampani opanga ma semiconductor.
● ePTFE: Mu gawo la chingwe, imagwiritsidwa ntchito ngati chotenthetsera cha zingwe zolumikizirana zapamwamba kwambiri, mu gawo la zamankhwala, imagwiritsidwa ntchito pamitsempha yamagazi yopangidwa ndi zomangira, ndipo mu gawo la mafakitale, imagwiritsidwa ntchito pa nembanemba yosinthira ma proton cell ndi zinthu zosefera mpweya.
PTFE ndi ePTFE iliyonse ili ndi ubwino wake. PTFE ndi yoyenera kutentha kwambiri, kuthamanga kwambiri, komanso malo owononga chifukwa cha kukana kutentha kwambiri, kukana mankhwala, komanso kukana kupsinjika kochepa; ePTFE, yokhala ndi kusinthasintha kwake, kulola mpweya kulowa, komanso kuyanjana ndi zinthu zina zomwe zimapangidwa ndi kapangidwe kake kakang'ono, imagwira ntchito bwino m'mafakitale azachipatala, kusefa, ndi kutseka kwamphamvu. Kusankha zinthu kuyenera kutsimikiziridwa kutengera zosowa za momwe ntchitoyo ikugwiritsidwira ntchito.
Kodi ePTFE imagwiritsidwa ntchito bwanji pazachipatala?
ePTFE (polytetrafluoroethylene yowonjezeredwa)imagwiritsidwa ntchito kwambiri m'zachipatala, makamaka chifukwa cha kapangidwe kake kapadera ka ma microporous, kuyanjana ndi zamoyo, si poizoni, siyambitsa khansa komanso siimayambitsa khansa. Ntchito zake zazikulu ndi izi:
1. Gawo la mtima ndi mitsempha yamagazi
Mitsempha yamagazi yopangidwa: ePTFE ndiye chinthu chopangidwa chomwe chimagwiritsidwa ntchito kwambiri popanga mitsempha yamagazi yopangidwa, chomwe chimapanga pafupifupi 60%. Kapangidwe kake ka ma microporous kamalola maselo a minofu ya anthu ndi mitsempha yamagazi kukula mmenemo, ndikupanga kulumikizana pafupi ndi minofu ya autologous, motero kumawonjezera kuchira komanso kulimba kwa mitsempha yamagazi yopangidwa.
Chigamba cha mtima: chimagwiritsidwa ntchito kukonza minofu ya mtima, monga pericardium. Chigamba cha mtima cha ePTFE chingalepheretse kumamatira pakati pa minofu ya mtima ndi sternum, kuchepetsa chiopsezo cha opaleshoni yachiwiri.
Stent ya mitsempha yamagazi: ePTFE ingagwiritsidwe ntchito kupanga chophimba cha stent ya mitsempha yamagazi, ndipo kuyanjana kwake bwino ndi thupi komanso mphamvu zake zimathandiza kuchepetsa kutupa ndi thrombosis.
2. Opaleshoni ya pulasitiki
Zopangira nkhope: ePTFE ingagwiritsidwe ntchito popanga zinthu zapulasitiki za nkhope, monga rhinoplasty ndi zodzaza nkhope. Kapangidwe kake ka ma microporous kumathandiza kukula kwa minofu ndikuchepetsa kukana.
Ma implants a mafupa: Mu gawo la mafupa, ePTFE ingagwiritsidwe ntchito popanga ma implants olumikizirana mafupa, ndipo kukana kwake kukalamba bwino komanso kusagwirizana ndi zinthu zina kumathandiza kukulitsa moyo wa ma implants.
3. Ntchito zina
Ziphuphu za Hernia: Ziphuphu za Hernia zopangidwa ndi ePTFE zimatha kuletsa kubwereranso kwa hernia, ndipo kapangidwe kake ka machubu kumathandiza kuphatikiza minofu.
Ma stitch a zachipatala: Ma stitch a ePTFE ali ndi kusinthasintha kwabwino komanso mphamvu yokoka, zomwe zimachepetsa kumatirira kwa minofu pambuyo pa opaleshoni.
Ma valve a mtima: ePTFE ingagwiritsidwe ntchito popanga ma valve a mtima, ndipo kulimba kwake komanso kugwirira ntchito bwino kwa ma valve kumathandiza kuwonjezera nthawi yogwira ntchito ya ma valve.
4. Zophimba zipangizo zachipatala
ePTFE ingagwiritsidwenso ntchito popaka zophimba zida zachipatala, monga ma catheter ndi zida zochitira opaleshoni. Kuchepa kwa kupsinjika kwake komanso kusagwirizana kwake ndi zinthu zina kumathandiza kuchepetsa kuwonongeka kwa minofu panthawi ya opaleshoni.
Nthawi yotumizira: Epulo-27-2025