Yog tias koj tham nrog cov chaw tsim khoom siv urological, koj yuav kawm sai sai tias cov khoom xaiv ncaj qha ua rau pom qhov tshwm sim, tshwj xeeb tshaj yog rau implantable ureteral stents. Tau ntau xyoo, cov neeg tsim khoom tau tshawb nrhiav cov polymers uas sib npaug ntawm qhov yooj yim, kev nyab xeeb thiab kev ua haujlwm, thiab kev kho mob - qib thermoplastic polyurethane (TPU) tsis tu ncua los ua cov txheej txheem kev lag luam.
ureteral stents, tseem hu ua ob J stents, nyob hauv tib neeg cov zis rau lub lis piam lossis ntau lub hlis tom qab phais pob zeb, kev kho mob nruj thiab lwm yam txheej txheem urological. Qhov no ntev - ib puag ncig kev sib cuag tau teeb tsa cov kev xav tau siab heev rau cov khoom siv raw. Peb cov qib TPU siab rau ureteral stents ua raws li ISO 10993 biocompatibility qauv. Lawv ua rau cov ntaub so ntswg me me thiab cov kab mob inflammatory, ib qho txiaj ntsig zoo dua li ntau cov polymers hloov tau yooj yim ntawm kev ua lag luam.
Ib qho tshwj xeeb feature yog balanced mechanical kev ua tau zoo. Cov khoom muaj lub zog tensile txaus los tiv thaiv kev puas tsuaj thaum lub sij hawm extrusion, raj tsim thiab chaw kho mob. Lub caij no, nws muab qhov tsim nyog softness ib zaug raug rau tib neeg lub cev kub. Qhov kub no - teb tau yooj yim heev txo kev sib txhuam tawm tsam ureteral mucosa, txiav cov neeg mob tsis xis nyob tom qab cog. Ntau lub tuam txhab peb koom tes nrog cov ntsiab lus no ua qhov muag tseem ceeb rau lawv cov stents tiav.
Hydrolysis kuj yog lwm qhov tsis yog - qhov taw qhia sib tham. Stents zaum tsis tu ncua hauv cov zis nrog cov ions nyuaj. Tsawg-polymers zoo zoo yuav degrade yooj yim, ua rau cov khoom tawg thiab muaj kev pheej hmoo ntawm encrustation. Peb cov ureteral stent-TPU tshwj xeeb tau txais cov qauv zoo polyether kom qeeb hydrolysis hauv lub cev. Nws txhawb kev nyab xeeb nyob rau hauv lub voj voog raws li feem ntau siv hauv kev kho mob.
Tsis tas li ntawd, cov khoom siv raw pom tau tias muaj kev sib raug zoo nrog cov kev ua kom tsis muaj menyuam xws li ethylene oxide thiab gamma irradiation. Tsis muaj qhov pom tseeb yellowing los yog kev ua tau zoo poob qis tshwm sim tom qab kev kho tshuaj tua kab mob. Nws txhawb nqa ntxiv radiopaque fillers tusyees thaum lub sij hawm extrusion, tso cai rau pom tseeb nyob rau hauv X-ray rau cov kws kho mob kom paub meej tias txoj hauj lwm stent.
Peb tau txhawb nqa ntau lub tuam txhab kho mob thoob ntiaj teb hauv kev hloov khoom siv thiab kev sim ntau lawm. Ntau tus neeg siv khoom siv silicone lossis PU generic ua ntej, thiab thaum kawg hloov mus rau peb cov kev kho mob TPU tom qab kev sib piv hauv chaw kho mob. Rau cov neeg tsim khoom tsim tawm cov kab ureteral stent tshiab, xaiv lub hom phiaj -TPU kho mob tshem tawm ntau qhov kev pheej hmoo zais hauv cov khoom sau npe thiab ntau lawm.