1.5 dunƙule hakowa kai

Ƙaƙƙarfan bayanin martaba mara ƙanƙanta masu ɓarna gefuna da faɗin bayanin martabar faranti suna ba da kusan babu tawul.Akwai a cikin ƙarin na musamman tsayi.

Amfanin titanium alloy sukurori:

1. Babban ƙarfi.Girman titanium yana da 4.51g/cm³, sama da na aluminum kuma ƙasa da na ƙarfe, jan ƙarfe da nickel, amma ƙarfin ya fi na sauran karafa.Dunƙule da aka yi da titanium gami yana da haske da ƙarfi.
2. Kyakkyawan juriya na lalata, titanium da titanium gami a cikin kafofin watsa labarai da yawa suna da kwanciyar hankali, ana iya amfani da sukurori na alloy na titanium zuwa yanayi iri-iri mai sauƙi.
3. Kyakkyawan juriya mai zafi da ƙarancin zafin jiki.Titanium alloy screws na iya aiki a yanayin zafi har zuwa 600 ° C da rage 250 ° C, kuma suna iya kula da siffar su ba tare da canzawa ba.
4. Ba magnetic, ba mai guba ba.Titanium wani ƙarfe ne wanda ba zai yiwu ba kuma ba zai zama magnetized a cikin manyan filayen magnetic ba.
5. Strong anti-damping performance.Compared da karfe da jan karfe, titanium yana da mafi tsawo vibration attenuation lokaci bayan inji vibration da lantarki vibration.This yi za a iya amfani da matsayin kunna cokali mai yatsu, vibration aka gyara na likita ultrasonic grinders da vibration fina-finan na ci-gaba audio lasifika. .

Zane zane don saurin dunƙule farawa da ƙananan karfin juyi.Faɗin zaɓi na faranti da raga, gami da mastoid da meshes na ɗan lokaci, da murfin burar rami don shunts.

Da matsi da dunƙule, mafi kyau?

Ana amfani da sukurori a aikin tiyatar kasusuwa don damfara wurin da ya karye, gyara farantin zuwa kashi, sannan a gyara kashin zuwa firam ɗin gyarawa na ciki ko na waje.Matsin da ake yi don matse dunƙule cikin kashi ya yi daidai da ƙarfin ƙarfin da likitan fiɗa.

Duk da haka, yayin da karfin juzu'i ya karu, screw yana samun matsakaicin karfin juzu'i (Tmax), a lokacin da karfin da ke riƙe da kasusuwa ya ragu kuma an fitar da shi kadan kadan. Pull-out force (POS) shine tashin hankali don karkatar da dunƙule daga kashi.Ana amfani da shi sau da yawa azaman ma'auni don auna ƙarfin riƙewa na dunƙule. A halin yanzu, dangantakar da ke tsakanin matsakaicin ƙarfi da ƙarfin cirewa har yanzu ba a san shi ba.

A asibiti, likitocin orthopedic yawanci suna saka dunƙule tare da kusan 86% Tmax. Duk da haka, Cleek et al.An gano cewa 70% Tmax dunƙule saka a kan tibia na tumaki zai iya cimma matsakaicin POS, yana nuna cewa za a iya amfani da karfin juzu'i mai yawa a asibiti, wanda zai rage kwanciyar hankali.

Wani bincike na kwanan nan na humerus a cikin mahaɗan ɗan adam ta Tankard et al.ya gano cewa an samu mafi girman POS a 50% Tmax. Babban dalilan da ke haifar da bambance-bambance a cikin sakamakon da ke sama na iya zama rashin daidaituwa na samfurori da aka yi amfani da su da kuma ma'auni daban-daban.

Saboda haka, Kyle M. Rose et al.daga Amurka sun auna dangantakar dake tsakanin Tmax daban-daban da POS ta hanyar screws da aka saka a cikin tibia na cadaver na ɗan adam, sannan kuma sun yi nazarin dangantakar dake tsakanin Tmax da BMD da kauri na cortical kashi. An buga takardar kwanan nan a cikin Dabaru a Orthopaedics. Sakamakon ya nuna cewa. Za a iya samun madaidaicin POS da makamantansu a 70% da 90% Tmax tare da jujjuyawar juzu'i, kuma POS na 90% Tmax dunƙule karfin juyi yana da girma fiye da na 100% Tmax.Babu wani bambanci a cikin BMD da kauri na cortical tsakanin ƙungiyoyin tibia, kuma babu wani dangantaka tsakanin Tmax da na sama biyu. Saboda haka, a cikin aikin asibiti, likitan likitancin bai kamata ya ƙarfafa dunƙule tare da matsakaicin ƙarfin juyi ba, amma tare da danniya kadan. kasa da Tmax.Ko da yake 70% da 90% Tmax na iya cimma irin wannan POS, har yanzu akwai wasu fa'idodi don overtighting dunƙule, amma karfin juyi dole ne ya wuce 90%, in ba haka ba za a shafa tasirin gyarawa.

Tushen: Dangantakar Tsakanin Ƙarfin Ƙarfin Ƙarfin Ƙarfin Fida da Ƙarfin Fida.Hanyoyin Dabaru a Orthopeedics: Yuni 2016 - Juzu'i 31 - Fitowa ta 2 - p 137-139.