https://pmc.ncbi.nlm.nih.gov/articles/PMC4115763/

Kev xaiv ntawm cov khoom siv hauv paus rauVABB koobncaj qha cuam tshuam rau lawv lub zog puncture, durability, thiab biocompatibility. Tam sim no, cov khoom tseem ceeb siv kev kho mob -qib 316 stainless hlau (SS316). Tsab ntawv xov xwm no qhia txog vim li cas nws tau dhau los ua qhov kev lag luam nyiam los ntawm kev tshuaj xyuas nws cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, thiab kev kho deg sib raug zoo.

Chemical Composition: Lub Foundation ntawm Corrosion Resistance

SS316 muaj molybdenum (2% - 3%), uas ua rau nws muaj zog tiv thaiv pitting corrosion nyob rau hauv ib puag ncig chloride (xws li cov kua hauv lub cev) piv rau 304 stainless hlau. Nrog rau cov ntsiab lus carbon tswj hauv qab 0.08%, nws tsis txhob cuam tshuam intergranular corrosion. Cov ntsiab lus npib tsib xee ntawm 10%–14% ua kom muaj kev ruaj ntseg ntawm austenitic microstructure, tswj tsis tau- cov khoom sib nqus txawm tias tom qab ua haujlwm txias- tseem ceeb rau MRI- kev coj ua biopsies, raws li cov khoom sib nqus tuaj yeem cuam tshuam cov hlau nplaum sib nqus.

Mechanical Properties: Qhov sib npaug ntawm Hardness thiab Toughness

Lub hardness yuav tsum tau rau VABB koob yog HRC 30-40 (kwv yees HB 285-380). SS316 nyob rau hauv nws raws li - tau txais cov mob muaj qhov tsis zoo hardness (HRB 70–90), tab sis tuaj yeem nce mus rau lub hom phiaj los ntawm kev kos duab txias thiab kev laus. This hardness ensures that the needle tip can penetrate dense fibrous tissue smoothly, while avoiding brittleness-induced fracture. Lub zog tawm los yuav tsum siab dua lossis sib npaug ntawm 205 MPa thiab lub zog tensile Ntau dua lossis sib npaug ntawm 515 MPa, txaus los tiv thaiv lub tshuab nqus tsev tsis zoo (kwv yees li 80 kPa) thiab cov hniav txiav torque.

Kev kho deg Compatibility: Zoo tagnrho substrate rau Passivation thiab Electrochemical Polishing

Cov chromium (16% – 18%) hauv SS316 sai tsim cov Cr₂O₃ tuab zaj duab xis thaum lub sij hawm passivation, nrog ib tug tuab ntawm kwv yees li 2-5 nm. Thaum lub sij hawm electropolishing, lub xub ntiag ntawm molybdenum txhawb nqa ntau yam anodic dissolution, txo qhov tshwm sim ntawm "txiv kab ntxwv tev" tsis xws luag. Tsis tas li ntawd, SS316 lub thermal expansion coefficient (17.3 × 10⁻⁶ /℃) zoo sib xws nrog cov cua sov- cuam tshuam cheeb tsam thaum lub sij hawm laser marking, ua rau ntse, tawg -cov npoo dawb.

Kev tswj hwm kev ua raws cai thiab Biocompatibility

SS316 ua raws li ASTM F899 tus qauv thiab tau dhau ISO 10993 biocompatibility kuaj (cov txiaj ntsig tsis zoo rau cytotoxicity, rhiab heev, thiab kev ntsuas khaus). RoHS Cov Lus Qhia (2011/65/EU thiab nws cov kev hloov kho) txwv rau 6 yam phom sij xws li txhuas thiab mercury; SS316 nws tus kheej tsis muaj cov ntsiab lus no, thiab tus neeg muag khoom yuav tsum muab cov lus tshaj tawm ua raws li cov khoom siv. Cov neeg tsim khoom kuj tseem yuav tsum tau tswj xyuas cov ntaub ntawv taug qab rau txhua pawg, suav nrog cov lej ntawm lub tshuab hluav taws xob, raws li ISO 13485.

Kev sib piv nrog lwm cov ntaub ntawv

Hauv kev sib piv, titanium alloy (Ti-6Al-}4V), txawm hais tias muab biocompatibility zoo dua, muaj qhov hardness tsawg (HRC 30-35) thiab tus nqi siab; cobalt-chromium alloy muaj zog dua (HRC 40-50), tab sis nws nyuaj rau kev ua thiab kim. SS316 ua tiav qhov zoo tshaj plaws sib npaug ntawm cov nqi-zoo, machinability, thiab tag nrho cov kev ua tau zoo, yog li ntes ntau dua 95% ntawm VABB koob kev lag luam.

Xaus

Kev xaiv cov ntaub ntawv yeej tsis tau txiav txim siab cais tawm. SS316 tau dhau los ua "tus qauv teb" rau VABB koob vim tias nws ua tau raws li qhov xav tau ntawm kev kho mob rau lub zog, kev tiv thaiv corrosion, kev pom, thiab tus nqi -kev ua tau zoo.