316LVM Hypotube: Tus Qauv Kub Rau Cov Khoom Siv Kho Mob Implantable

Pain Points hauv Implantable Device Materials​

Cov kws kho mob cov cuab yeej tsim kho lub sijhawm ntev xws li vascular stents, lub plawv li qub, lossis orthopedic anchors ntsib ib qho kev sib tw tsis tu ncua: nrhiav cov khoom uas sib xyaw ua ke zoo heev corrosion kuj, biocompatibility siab, thiab muaj zog txhua yam. Ib txwm 304 stainless hlau, thaum muaj zog, tuaj yeem tso cov kab nickel thiab chromium ions nyob rau lub sijhawm, uas ua rau muaj kev kub ntxhov lossis mob. Hauv kev siv ntshav sib cuag, txawm tias qhov me me ntawm qhov tsis zoo tuaj yeem ua rau thrombogenicity. Tsis tas li ntawd, qhov sib txawv ntawm kev xa mus rau qhov me me yuav tsum tau shafts uas yog ob qho tib si pushable thiab saj zawg zog, tab sis muaj peev xwm tiv taus cov txheej txheem laser-txiav yam tsis tau poob kev ncaj ncees. Qhov tsis muaj kev ntseeg siab, cog-qib hypotube uas ua tau raws li ISO 13485 thiab ASTM F138 tus qauv feem ntau ua rau raug nqi kho dua tshiab thiab qeeb hauv kev kho mob txhais lus.

Txoj cai ntawm 316LVM Hypotube Performance​

316LVM (Low Carbon Vacuum Melted) stainless hlau yog qhov txawv ntawm 316L, ua los ntawm lub tshuab nqus tsev arc remelting (VAR) lossis electroslag remelting (ESR). Cov txheej txheem no txo ​​cov impurities, non-metallic inclusions, thiab carbon cov ntsiab lus, uas ua rau ib homogenous microstructure nrog superior corrosion kuj thiab qaug zog lub neej. Qhov kev xaiv "VM" ua kom cov khoom ua tau raws li cov kev cai nruj ntawm ASTM F138 / F139 rau kev cog qoob loo. Thaum kos rau hauv lub hypotube (sab nraud diameters ntawm 0.20 hli mus rau 20 hli), 316LVM muab qhov zoo tshaj plaws tshuav nyiaj li cas ntawm tensile lub zog (Ntau tshaj los yog sib npaug rau 485 MPa) thiab elongation. Laser txiav qhia cov qauv uas hauv zos hloov pauv yooj yim thaum khaws cia lub raj xa mus rau lub cev muaj zog. Qhov dav dav dav (tsawg kawg 0.012 hli) tuaj yeem ua tiav nrog cov niaj hnub pulsed fiber ntau lasers tso cai rau cov geometries intricate yam tsis muaj kev cuam tshuam cov passive chromium-nplua nuj oxide txheej uas muab 316LVM nws legendary biocompatibility.

Kev faib tawm ntawm cov cuab yeej Laser txiav rau 316LVM​

Kev ua haujlwm 316LVM hypotube xav tau cov lasers uas txo cov tshav kub cuam tshuam (HAZ) kom tsis txhob muaj kev puas tsuaj. Cov khoom siv tseem ceeb yog:

Pulsed Fiber Lasers (20-100 W): Zoo tagnrho rau kev txiav phab ntsa txog li 0.5 hli; muab cov nqaj zoo zoo thiab nqus ntawm 1064 nm.

Picosecond/Femtosecond Ultra-ceev Lasers: Muab "txias ablation" nrog HAZ tsis pom zoo, zoo meej rau cov hlab ntsha ultra-thin-walled (OD < 1 mm) thiab cov qauv sib txawv.

CO₂ Lasers: Tsis tshua muaj siv rau 316LVM vim qhov nqus tsis zoo, tab sis qee zaum ua haujlwm rau kev txiav tawm tom qab txiav.

Cov txheej txheem kev txav muaj xws li cov theem kev ua haujlwm siab nrog cov runout <1 µm thiab cov theem linear nrog nanometer daws teeb meem. Lub zeem muag kev sib raug zoo ua kom cov qauv raug, thaum coaxial pab roj (nitrogen lossis argon) tiv thaiv oxidation thaum txiav.

Phau Ntawv Qhia Txog Kev Ua Haujlwm​

Txhawm rau laser-txiav 316LVM hypotube, pib los ntawm kev xa cov duab 2D / 3D rau hauv CAD / CAM software. Xaiv ib lub laser pulsed fiber ntau nrog rau qhov chaw me me piv rau qhov xav tau 0.012 hli kerf. Ntxuav lub raj hauv da dej ultrasonic kom tshem tawm cov roj. Ruaj nws nyob rau hauv ib tug precision collet ntawm lub teb axis. Teem tsis tau: mem tes zog 0.1-0.5 mJ, repetition tus nqi 50-200 kHz, txiav ceev 200-400 mm / s. Siv nitrogen pab roj ntawm 15 bar. Ua ib qho kev sim txiav rau ntawm ntu ntu thiab tshuaj xyuas hauv qab lub tshuab ntsuas kom pom qhov poob thiab rov ua dua. Tom qab tag nrho cov khoom, electropolish qhov chaw kom tshem tawm cov micro-burrs thiab txhim khu lub passive txheej. Thaum kawg, passivate rau ASTM A967 siv citric acid. Cov ntaub ntawv txhua kauj ruam rau ISO 13485 traceability.

Kev paub tiag-lub ntiaj teb​

Peb lub Hoobkas tau muab 316LVM hypotubes rau cov hlab plawv stent xa khoom. Hauv ib qhov project, tus neeg siv khoom xav tau lub taub hau uas tuaj yeem taug kev tortuous coronary anatomy yam tsis muaj kinking. Peb siv qhov cuam tshuam kauv txiav qauv nrog lub suab sib txawv, ua tiav 35% kev txhim kho hauv cov lus teb torque piv rau cov khoom siv. Ib zaj lus qhia tseem ceeb uas tau kawm yog qhov tseem ceeb ntawm cov khoom siv nqus-melted: ib pawg ntawm cov tsis-VM 316L pom cov micro-inclusions uas ua rau laser-txiav irregularities. Hloov mus rau ntawv pov thawj 316LVM tshem tawm qhov teeb meem. Peb kuj pom tau tias electropolishing nrog ib tug balanced phosphoric-sulfuric electrolyte txo nto roughness rau Ra <0.05 µm, ho txo ​​thrombogenicity nyob rau hauv vitro. Cov kev paub dhau los no qhia txog qhov tsim nyog ntawm cov khoom siv traceability thiab nruj tom qab ua tiav.

Summary thiab Sublimation​

Lub 316LVM hypotube yog ntau tshaj ib feem; Nws yog ib qho pov thawj rau kev sib koom ua ke ntawm metallurgy thiab precision engineering. Nws lub peev xwm los hloov pauv los ntawm lub raj yooj yim kos rau hauv txoj kev cawm seej implantable qauv ua piv txwv qhov kawg ntawm cov cuab yeej kho mob tshiab. Los ntawm kev kov yeej cov teeb meem uas tshwm sim ntawm corrosion thiab biocompatibility, engineers tuaj yeem tsom mus rau qhov tseem ceeb: txhim kho cov txiaj ntsig ntawm tus neeg mob. Lub hypotube txoj kev taug kev los ntawm lub tshuab nqus tsev-melted ingot mus rau lub laser-txiav, implant-npaj ntaus ntawv qhia txog kev nrhiav kev ua tau zoo tsis tu ncua uas txhais cov kev kho mob niaj hnub no.

Cov kev cia siab yav tom ntej thiab cov lus pom zoo​

Saib ua ntej, qhov kev thov rau 316LVM hypotubes yuav loj hlob nyob rau hauv cov qauv ntawm lub plawv thiab neurovascular daim ntaub ntawv. Peb pom zoo kom nqis peev hauv ultra-ceev laser thev naus laus zis kom ua tiav cov yam ntxwv sub-micron thiab tshawb nrhiav kev tsim khoom sib xyaw uas sib xyaw laser txiav nrog 3D-luam cov cim. Cov neeg tsim khoom yuav tsum ua raws li ISO 13485: 2016 daim ntawv pov thawj thiab koom nrog cov khoom tsim nyog thaum ntxov kom ntseeg tau tias cov khoom sib xws. Tsis tas li ntawd, kev siv cov ntxaib simulations rau cov qauv kev ua kom zoo dua qub yuav txo qis cov voj voog prototyping. Raws li tus kheej cov tshuaj nthuav dav, lub peev xwm los tsim cov neeg mob tshwj xeeb 316LVM hypotubes yuav dhau los ua kev sib tw. Thaum kawg, cov khoom siv no tseem yuav teeb tsa tus qauv ntsuas rau cov khoom siv kho mob implantable.