Ultrahigh-Molecular-Uburemere Polyethylene
Weihong Jin, Paul K. Chu, muriEncyclopedia yubuhanga bwibinyabuzima, 2019
UHMWPEni umurongopolyolefinhamwe nigice gisubiramo cya - CH2CH2 -.Ubuvuzi-urwego UHMWPE rufite iminyururu ndende hamwe namisaya 2 × 106–6 × 106 g mol− 1 kandi ni asemicrystalline polymerhamwe nuruhererekane rwuturere twashyizwemo bidahwitseicyiciro cya amorphous(Turell na Bellare, 2004).UHMWPE ifite friction nkeya, kwihanganira kwambara cyane, gukomera, hejuruimbaraga zingaruka, kurwanya cyane imiti yangirika, biocompatibilité nziza, nigiciro gito.
UHMWPE yakoreshejwe mubuvuzi murigufatanya gushiramokumyaka irenga 40, cyane nkumurongo wa arctular mugusimbuza ikibuno cyose hamwe no kwinjiza tibial mugusimbuza amavi yose.Mu 1962, UHMWPE yakoreshejwe bwa mbere nkibigize acetabular kandi yabaye yiganjegutwara ibikoreshomu gusimbuza ikibuno cyose kuva muri za 1970.Nyamara, kwambara UHMWPE guhura nibintu bikomeye bikozwe mu byuma cyangwa mubutaka byari ikibazo gikomeye muri ortopedie mu myaka ya za 1980 bitewe ahanini no guhora uhinduranya iminyururu ya polymer.Imyanda yo kwambara irashobora guteraosteolysisbiganisha ku kurekura ibyatewe no guca intege amagufwa.
Habayeho intambwe nini mu iterambere rya UHMWPE ihuza cyane mu mpera za 90.Kwambukiranya UHMWPE bishyirwa mubikorwa muguhindura iminyururu kuruhande hamwe nimirasire nkagamma ray,amashanyarazi, cyangwa imiti nka peroxide kugirango irusheho kunanirwa kwambara bitewe no kugabanuka kwimigozi ya polymer nyuma yo guhuza (Lewis, 2001).Kunozaokisidekurwanywa, guhuza UHMWPE bivurwa cyane.Uhuza cyane UHMWPE yakoreshejwe neza mugutwara imitwaroingingokandi ihinduka bisanzwe mubisimbuza ikibuno cyose.
Mbere yo guterwa, gutera amagufwa muri rusange biterwa na gamma irrasiyo mu kirere kidukikije.Imirasire ya gamma itera gushiraho radicals yubusa binyuze mumurongo.Nyuma ya irrasiyo ya gamma, radicals yubuntu irashobora kubaho muri polymer hanyuma ikitwara nubwoko O iboneka mugihe cyo kubika cyangwa muri vivo itera okiside yangiza ya UHMWPE (Premnath et al., 1996).Nubwo UHMWPE ihuza cyane UHMWPE yongereye imbaraga zo kwambara, indi mico nko guhindagurika,kuvunika gukomera, kurwanya umunaniro, naimbaragairashobora guhungabana na gamma irrasiyoya (Lewis, 2001; Premnath et al., 1996).
Uburyo budahwitse nka sterilisation ukoresheje gaze ya Ethylene cyangwaplasmakugaragara, kandi hari uburyo bwo kuvura butajegajega nabwo bwakozwe nyuma yo guhuza kugirango bakureho ingaruka zavuzwe haruguru (Kurtz et al., 1999).Antioxydantsvitamine E.yinjijwe kandi muri UHMWPE ihuza imipaka kugirango ihagarike okiside ikora hamwe na radicals yubuntu (Bracco na Oral, 2011).
Haracyariho amateka yubuvuzi mubice bisimburana nubwo vitamine E yerekana umutekano hamwe na biocompatibilité.Kubwibyo, uburyo bwo kongera imbaraga zo kwambara bitabujije ikindi kintu cyingenzi cya UHMWPE hamwe nubuvuzi bwigihe kirekire bwo kwivuza burakenewe kuri UHMWPE muriPorogaramu.
Igihe cyo kohereza: Jun-26-2023
