Ultrahigh-Molecular-Weight Polyethylene
Weihong Jin, Paul K. Chu, inEncyclopedia of Biomedical Engineering, 2019
UHMWPEwaa toosanpolyolefinoo leh unug soo noqnoqda oo ah -CH2CH2 -.Heerka caafimaadka UHMWPE wuxuu leeyahay silsilado dhaadheer oo leh acufka molecularee 2 × 106–6 × 106 g mol− 1 waana apolymer semirystallineoo leh gobollo la amray oo khalkhalsanwajiga amorphous(Turell iyo Bellare, 2004).UHMWPE waxay leedahay khilaaf hoose, caabbinta xidhashada sare, adkaanta wanaagsan, sarexoog saamayn, Iska caabbinta sare ee kiimikooyinka daxalka ah, ku habboonaanta noole aad u fiican, iyo qiimo jaban.
UHMWPE waxa loo isticmaalay kiliinikada gudahawadajir beeralaydain ka badan 40 sano, gaar ahaan sida liner articular ee wadarta beddelka miskaha iyo gelinta tibial ee beddelka jilibka.Sannadkii 1962-kii, UHMWPE waxaa markii ugu horreysay loo adeegsaday sidii qaybaha acetabular waxayna noqotay tan ugu sarreysaalaabta wax lagu sidowadarta beddelka miskaha ilaa 1970-yadii.Si kastaba ha ahaatee, xidhashada UHMWPE ee la xidhiidha qaybaha adag ee ka samaysan biraha ama dhoobada waxay ahayd dhibaato weyn oo ku dhacday lafaha 1980-meeyadii taasoo ay ugu wacan tahay dib u habeynta joogtada ah ee silsiladaha polymer.Burburka xirashada ayaa laga yaabaa inay keentoosteolysistaasoo horseedda dabacsanaan ku-tallaalidda iyo daciifinta qaab-dhismeedka lafaha.
Waxaa jiray horumar weyn oo laga gaaray horumarinta UHMWPE-da aadka isugu xiran dabayaaqadii 1990-meeyadii.Isku-xidhka UHMWPE ayaa si ballaaran loo hirgeliyaa iyada oo la xag-jinaya silsiladaha dhinaca shucaaca sidagamma ray,iftiinka elektarooniga ah, ama kiimikooyinka sida peroxide si loo hagaajiyo caabbinta xirashada sababtoo ah dhaqdhaqaaqa hoos u dhaca silsiladaha polymer ka dib isku xirka (Lewis, 2001).Si loo hagaajiyooksidationiska caabin, UHMWPE-ku-xidhan yahay si heerkul ah ayaa loo daweeyaa.UHMWPE si heer sare ah isugu xiran ayaa si guul leh loogu adeegsaday qaadistakala goysyadaoo noqda halbeegga wadarta beddelka miskaha.
Kahor intaan la gelin, maqaar-galaha lafaha guud ahaan waxaa lagu nadiifiyaa gamma irdiation ee hawada agagaarkeeda.Raajo Gamma waxa uu keenaa samaynta xag-jiryada xorta ah iyada oo loo marayo kala-goynta silsiladda.Ka dib shucaaca gamma-ga, xagjiriinta xorta ah ayaa laga yaabaa inay wali ku jiraan polymer-ka oo ay la falgalaan noocyada O ee la heli karo inta lagu jiro kaydinta ama vivo waxay keenaysaa oksaydhka waxyeellada leh ee UHMWPE (Premnath et al., 1996).In kasta oo UHMWPE-da aadka isugu xidhan ay kor u qaadday iska caabbinta xidhashada, guryaha kale sida ductility,adkaanta jabka, iska caabin daal, iyoxoog adkaysiwaxaa wax u dhimi kara gamma irradiation (Lewis, 2001; Premnath et al., 1996).
Hababka aan-nionizing-ka ahayn sida nadiifinta iyadoo la isticmaalayo gaaska ethylene oxide amabalaasmaha gaaskasoo baxa, iyo qaar ka mid ah daawaynta xasilinta ayaa sidoo kale la sameeyay ka dib markii la isku xiray si loo baabi'iyo saameynta xun ee hore loo sheegay (Kurtz et al., 1999).Antioxidant-kafitamiin EWaxa kale oo lagu daray UHMWPE-isku-xiran si loo xakameeyo oksaydhka iyadoo lagaga falcelinayo xag-jirrada xorta ah (Bracco iyo Oral, 2011).
Wali ma jirto taariikh caafimaad oo ku jirta qaybaha beddelka wadajirka ah in kasta oo fitamiin E uu muujiyo badbaadada iyo noolaanshaha.Sidaa darteed, hababka kor loogu qaado iska caabbinta xidhashada iyada oo aan waxyeello loo geysan wax sifooyinka kale ee muhiimka ah ee UHMWPE iyo codsiga daaweynta muddada dheer ayaa loo baahan yahay UHMWPEcodsiyada lafaha.
Waqtiga boostada: Juun-26-2023
