Vim li cas "Titanium" yog hlau nyiam rau tib neeg cog?
Hauv kev kho mob, thaum cog xws li cov pob qij txha, pob txha daim hlau, screws, los yog cov hlab plawv stents yuav tsum tau, titanium thiab nws cov alloys (xws li Ti-6Al-4V) yog undoubtedly qhov kev xaiv ntawm cov khoom siv hlau. Qhov no tsis yog coincidence tab sis stems los ntawm titanium lub cim ua ke ntawm cov khoom uas tso cai rau nws ua ke nyob rau hauv siab sib haum xeeb nrog tib neeg lub cev. Nws cov txiaj ntsig tseem ceeb nyob hauv cov chaw hauv qab no:
1. Biocompatibility zoo heev: Ua kom "Peaceful Coexistence"
Biocompatibility yog qhov tseem ceeb tshaj plaws rau cov khoom cog, xa mus rau cov khoom siv lub peev xwm los ua ke nrog tib neeg cov ntaub so ntswg, ntshav, thiab pob txha yam tsis ua rau muaj kev phiv tshuaj lom lossis tsis lees paub.
- Stable Passive Txheej: Titanium instantly forms an extremely dense, stable, and self-repairing oxide layer on its surface. Qhov no inert zaj duab xis zoo tiv thaiv lub hauv paus titanium hlau los ntawm kev corroded los ntawm complex ib puag ncig ntawm lub cev kua, txo qhov tso tawm ntawm hlau ions. Hauv qhov sib piv, qee cov hlau (xws li stainless hlau lossis cobalt-} chromium alloys) tuaj yeem tso cov ions ntau npaum li cas (piv txwv li, npib tsib xee, chromium, cobalt) ntev dua - lub sij hawm cog, uas yuav ua rau muaj kev fab tshuaj, o, lossis lwm yam kev phiv tshwm sim. Cov yam ntxwv no ua rau titanium yog ib qho ntawm feem ntau 'ntev' thiab 'tsis muaj mob' hlau hauv tib neeg lub cev.
2. Qhov zoo tshaj plaws Mechanical Properties: Sib piv cov pob txha "Strength thiab Flexibility"
Ib qho kev cog qoob loo yuav tsum tsis yog tsuas yog sib xws tab sis nws cov khoom siv kho tshuab yuav tsum sib haum nrog tib neeg cov pob txha, lub tswv yim tseem ceeb hu ua 'mechanical compatibility'.
- Siab zog-rau-Qhov hnyav piv thiab Modulus qis: Titanium alloys muaj lub zog siab heev - rau - qhov hnyav piv, txhais tau tias kev cog ntoo tuaj yeem ua kom sib dua thaum ua kom muaj zog txaus. Qhov tseem ceeb tshaj, lawv cov elastic modulus (kev ntsuas ntawm qhov tawv nqaij) qis dua li cov hlau tsis muaj steel thiab cobalt -chromium alloys, ua rau nws ze rau ntawm tib neeg cov pob txha. Yog tias qhov kev cog hniav (xws li pob txha phaj) nruj dhau lawm, nws muaj feem ntau ntawm cov kev ntxhov siab, ua rau cov pob txha hauv qab ua osteoporotic thiab atrophying vim 'kev nyuaj siab tiv thaiv'. Cov tawv nqaij nruab nrab ntawm titanium alloys pab tswj kom muaj kev ntxhov siab ntau dua hauv cov pob txha, txhawb kev kho mob thiab ntev - cov pob txha noj qab haus huv.
3. Cim Osseointegration Muaj Peev Xwm: "Bonding" nrog pob txha
Qhov no yog qhov tseem ceeb, feem ntau irreplaceable, zoo dua ntawm titanium hauv orthopedics thiab kho hniav.
- Osseointegration yog hais txog kev sib txuas ncaj qha thiab kev ua haujlwm ntawm cov pob txha nyob thiab qhov chaw ntawm cov khoom thauj -cov kabmob cog, tsis muaj kev cuam tshuam cov ntaub so ntswg. Cov yam ntxwv saum npoo ntawm titanium, tshwj xeeb tshaj yog tom qab roughening los yog ntxeem tau ua, muab ib qho zoo heev scaffold rau cov pob txha pob txha txuas, tsiv teb tsaws, thiab loj hlob. Cov pob txha tshiab tuaj yeem loj hlob mus rau hauv micro- qhov pores ntawm titanium, tsim kom muaj kev ruaj khov 'biological lock' es tsis yog kev kho tshuab xwb. Qhov kev sib koom ua ke muaj zog no ua kom lub sijhawm ntev - kev ruaj ntseg ntawm cov cog cog, txo qhov kev pheej hmoo ntawm loosening thiab tsis ua haujlwm.
Xaus
Hauv cov ntsiab lus, titanium yog qhov kev xaiv tseem ceeb tshaj plaws rau tib neeg kev cog qoob loo vim nws qhov tsis sib xws ntawm biocompatibility, zoo -cov khoom sib xws, thiab lub peev xwm tshwj xeeb rau osseointegrate. Nws tsis yog tsuas yog tshuaj lom neeg ruaj khov thiab tsis yog - tshuaj lom tab sis kuj ua haujlwm hauv kev sib koom ua ke nrog tib neeg lub cev ntawm ob qho tib si thiab lom neeg, txhawb kev tsim kho thiab kho. Nws sawv cev rau qhov kev tshawb pom tseem ceeb hauv cov ntaub ntawv kho mob niaj hnub no.
