1.5 sekoti sa ho iketsetsa

Lipoleiti tsa boemo bo tlase ba boemo bo tlase bo chamfered le profil ea sephara e pharaletseng ha e fane ka matla. E fumaneha ka bolelele bo ikhethileng haholoanyane.

Melemo ea li-screws tsa titanium alloy:

1. Matla a phahameng. Boima ba titanium ke 4.51g/cm³, e phahame ho feta ea aluminium 'me e tlase ho feta ea tšepe, koporo le nickel, empa matla a phahame haholo ho feta a lirafshoa tse ling. Screw e entsoeng ka titanium alloy e bobebe ebile e matla.
2. Ho hanyetsa kutu e ntle, titanium le alloy ea titanium mecheng e mengata ea litaba e tsitsitse haholo, li-screws tsa alloy tsa titanium li ka sebelisoa libakeng tse sa tšoaneng tse senyang habonolo.
3. Ho hanyetsa mocheso o motle le ho hanyetsa mocheso o tlaase. Li-screws tsa alloy tsa Titanium li ka sebetsa mocheso ho fihlela ho 600 ° C le ho tlosa 250 ° C, 'me li ka boloka sebōpeho sa tsona ntle le ho fetoha.
4. Non-magnetic, non-toxic.Titanium ke tšepe e se nang makenete 'me e ke ke ea hoketsoa libakeng tse phahameng haholo tsa makenete.Eseng feela e seng chefo, 'me e na le tumellano e ntle le' mele oa motho.
5. Ts'ebetso e matla ea ho thibela metsi.Ha e bapisoa le tšepe le koporo, titanium e na le nako e telele ka ho fetisisa ea ho thothomela ka mor'a ho sisinyeha ha mochine le ho sisinyeha ha motlakase.Tlhahiso ena e ka sebelisoa e le lifereko tsa ho lokisa, likarolo tsa ho sisinyeha tsa li-grinder tsa bongaka tsa ultrasonic le lifilimi tsa vibration tsa libuela-hōle tse tsoetseng pele.

Moralo oa khoele bakeng sa ho qala screw ka potlako le torque e tlase ea ho kenya. Khetho e pharalletseng ea lipoleiti le mesh, ho kenyeletsoa mastoid le meshes ea nakoana, le likoahelo tsa lesoba la li-shunts.

Ha sekurufu se tiea, ho molemo hakae?

Li-screws li atisa ho sebelisoa ho buuoa ka masapo ho hatella sebaka sa ho robeha, ho lokisa poleiti ho lesapo, le ho lokisa lesapo ho foreimi ea ka hare kapa ka ntle ea ho lokisa.Khatello e sebelisoang ho petetsa sekoti ka har'a lesapo e lekana le torque e sebelisoang ke ngaka e buoang.

Leha ho le joalo, ha matla a torque a ntse a eketseha, sekoti se fumana matla a maholo a torque (Tmax), ka nako eo matla a ho tšoara ha screw holim'a lesapo a fokotsehile 'me a ntšoa sebaka se senyenyane.Pull-out force (POS) ke tsitsipano ea ho sotha screw ho tsoa lesapong. Hangata e sebelisoa e le parameter ho lekanya matla a ho tšoara screw. Hona joale, kamano pakeng tsa torque e kholo le matla a ho hula e ntse e sa tsejoe.

Hangata, lingaka tse buoang tsa masapo li kenya screw ka hoo e ka bang 86% Tmax. Leha ho le joalo, Cleek et al. o fumane hore 70% Tmax ho kenngoa ha screw holim'a tibia ea linku ho ka finyella boholo ba POS, e leng se bontšang hore matla a feteletseng a torsion a ka sebelisoa kliniki, e leng ho ka fokotsang botsitso ba ho lokisa.

Phuputso ea morao-rao ea li-humerus ka har'a batho ka Tankard et al. e fumane hore boholo ba POS bo fumanoe ho 50% Tmax. Mabaka a ka sehloohong a ho se tšoane ha liphello tse ka holimo e ka 'na ea e-ba ho se lumellane ha mehlala e sebelisoang le litekanyetso tse fapaneng tsa tekanyo.

Ka hona, Kyle M. Rose et al. ho tloha United States ho ile ha lekanya kamano pakeng tsa Tmax e fapaneng le POS ka li-screws tse kentsoeng ka har'a tibia ea li-cadavers tsa batho, 'me ea boela ea hlahloba kamano pakeng tsa Tmax le BMD le cortical bone thickness.Pampiri e sa tsoa hatisoa ka Techniques in Orthopaedics.Liphetho li bontša hore POS e ka holimo le e tšoanang e ka fumanoa ho 70% le 90% Tmarque ea 90% Tmarque le 90% Tmarque. e kholo haholo ho feta ea 100% Tmax. Ho ne ho se na phapang pakeng tsa BMD le botenya ba cortical pakeng tsa lihlopha tsa tibia, 'me ho ne ho se na kamano pakeng tsa Tmax le tse peli tse ka holimo.Ka lebaka leo, ts'ebetsong ea meriana, ngaka e buoang ha ea lokela ho tiisa sekoti ka matla a mangata a torsion, empa ka torque e nyenyane ho feta Tmax. Le hoja 70% le 90% Tmax e ka finyella POS e tšoanang, ho ntse ho e-na le melemo e meng ea ho tiisa sekoti, empa torque ha ea lokela ho feta 90%, ho seng joalo phello ea ho lokisa e tla ameha.

Mohloli: Kamano Pakeng Tsa Torque e Insertional le Pullout Strength of Surgical Screws.Techniques in Orthopaedics: June 2016 - Volume 31 - Issue 2 - p 137–139.