Surface Finish of Laser Cut Regular Wall Hypotube: Txhim kho Biocompatibility

Pain Points hauv Nto Zoo​

Laser txiav tawm micro-burrs thiab tshav kub-tshem tawm tsam uas tuaj yeem ua rau thrombogenicity. Ua kom tiav qhov du, biocompatible nto ntawm phab ntsa hypotube yog qhov tseem ceeb, tshwj xeeb tshaj yog rau kev siv ntshav sib cuag. Rough nto ua rau muaj kev sib txhuam thiab kev pheej hmoo ntawm corrosion. Nyob rau hauv cov phab ntsa tsis tu ncua, cov hlaws tuab dua ua rau cov teeb meem no ntau dua vim tias cov khoom siv ntau dua yog yaj thiab rov ua kom muaj zog dua thaum txiav, uas ua rau muaj txheej txheej loj dua. Txoj kev mus rau cov kab me me thiab cov qauv nyuaj ntxiv rau qhov kev sib tw ntog, vim cov txheej txheem polishing ib txwm tsis tuaj yeem ncav cuag cov yam ntxwv sab hauv. Tsis tas li ntawd, kev siv cov pa phem los yog cov khoom siv tsis zoo laser tuaj yeem muab cov kab mob sib kis rau hauv qhov chaw txiav, degrading biocompatibility. Cov neeg tsim khoom yuav tsum tau sib cav nrog kev cuam tshuam ib puag ncig ntawm cov tshuaj kho mob siv rau hauv qhov chaw tiav, thawb kev lag luam mus rau cov txheej txheem ntsuab yam tsis muaj kev txi zoo. Qhov tsis muaj cov qauv txheej txheem roughness qhov pib rau cov ntawv thov tshwj xeeb ntxiv rau qhov tsis paub tseeb, feem ntau ua rau over-processing lossis under-processing.

Txoj Cai ntawm Kev Kho Nto​

Electropolishing tshem tawm micro-irregularities, tsim ib tug passive chromium-nplua nuj txheej. Passivation nrog citric acid txhim kho corrosion kuj. Lub hom phiaj yog Ra <0.2 µm. Electropolishing ua hauj lwm los ntawm anodic dissolution, nyiam etching peaks los tsim ib tug du, theem nto. Cov txheej txheem tseem tshem tawm cov txheej txheem rov ua dua thiab micro-cracks qhia los ntawm laser txiav. Passivation tshem tawm cov hlau dawb thiab txhawb kev tsim cov txheej txheem chromium oxide. Ua ke, cov kev kho mob no ua kom lub hypotube ua tau raws li qhov xav tau ntawm tib neeg lub cev. Lub hauv paus ntsiab lus tom qab electropolishing suav nrog kev tsim cov txheej viscous ntawm cov hlau-electrolyte interface, uas tswj cov kev sib cais thiab ua rau muaj kev cuam tshuam. Ua kom raug, cov txheej txheem no tuaj yeem txo qhov roughness ntawm qhov chaw qis dua 0.1 µm, txhim kho biocompatibility thiab txo qhov kev pheej hmoo ntawm thrombosis. Rau cov phab ntsa hypotubes li niaj zaus, cov phab ntsa tuab yuav tsum tau ceev faj tswj cov khoom siv electropolishing kom tsis txhob tshem tawm cov khoom siv ntau dhau uas tuaj yeem hloov pauv cov qauv txiav geometry.

Kev faib cov khoom siv​

Cov cuab yeej kho mob saum npoo muaj xws li electropolishing tso tsheb hlau luam nrog qhov kub thiab txias tswj tam sim no, ultrasonic nqus tsev vacuum rau kev kho ua ntej thiab tom qab kev kho mob, thiab cov chav passivation. Rau high-volume ntau lawm, automated electropolishing kab nrog robotic tuav kom zoo ib yam. Qee qhov chaw siv laser polishing, qhov chaw thib ob laser dhau melts saum npoo kom du, tab sis qhov no tsis tshua muaj rau hypotubes vim qhov kev pheej hmoo ntawm kev hloov cov khoom siv. Cov khoom siv txheej txheej rau kev siv cov txheej txheem hydrophilic lossis hydrophobic tuaj yeem ua ke rau hauv cov txheej txheem. Txhua qhov system yuav tsum raug lees paub los xyuas kom meej cov txiaj ntsig zoo ib yam thiab ua raws li cov qauv kev kho mob. Cov cuab yeej siv qib siab tuaj yeem ua qhov ntsuas qhov sib txawv ntawm qhov sib txawv ntawm qhov siv qhov pom qhov profile, tso cai rau kev hloov kho lub sijhawm. Kev tswj ib puag ncig xws li fume extraction thiab pov tseg kev kho mob yog qhov tseem ceeb ntawm cov chaw kho mob niaj hnub no, ua kom tus neeg teb xov tooj muaj kev nyab xeeb thiab kev ua raws cai.

Phau Ntawv Qhia Txog Kev Ua Haujlwm​

Tom qab laser txiav, tam sim ntawd ntxuav lub hypotube nyob rau hauv ib tug ultrasonic da dej nrog ib tug me me detergent kom tshem tawm tej kua thiab hais. Yaug nrog dej deionized. Rau electropolishing, npaj cov tshuaj electrolyte (feem ntau phosphoric thiab sulfuric acid sib tov). Raus lub raj thaum siv cov khoom siv ncaj qha; qhov hluav taws xob thiab lub sijhawm nyob ntawm qhov xav tau tshem tawm (feem ntau yog 5-15 µm). Saib xyuas qhov kub kom tsis txhob overheating. Tom qab electropolishing, neutralize cov kua qaub, yaug kom huv si, thiab qhuav. Ua passivation nyob rau hauv ib da dej citric acid rau 20-30 feeb ntawm chav tsev kub. Thaum kawg, tshuaj xyuas qhov chaw hauv qab lub tshuab ntsuas hluav taws xob (SEM) txhawm rau txheeb xyuas qhov smoothness thiab tsis muaj qhov tsis xws luag. Ua ib qho kev kuaj corrosion rau ASTM F2129 kom paub meej tias qhov ua tau zoo ntawm kev kho saum npoo. Cov ntaub ntawv tag nrho cov kauj ruam thiab cov kev txwv rau traceability thiab kev ua raws cai. Nws kuj tseem pom zoo kom siv cov txheej txheem kev lees paub uas suav nrog kev rov ua kom huv thiab ua kom tsis muaj menyuam kom ntseeg tau tias qhov chaw ruaj khov ntawm lub cuab yeej siv lub neej ntev.

Kev paub tiag-lub ntiaj teb​

Tus neeg siv khoom implantable sensor yuav tsum tau tshwj xeeb nto zoo. Initial electropolishing tshuav ib lub txiv kab ntxwv-tev zoo nkauj; kho qhov ceev tam sim no thiab da dej agitation daws nws. Citric acid passivation ua pov thawj zoo li nitric, nrog rau kev cuam tshuam ib puag ncig tsawg. Peb kuj pom tias kev ntxuav kom huv tom qab kho cov kua qaub yog qhov tseem ceeb; tej acid residual tuaj yeem ua rau pitting corrosion thaum tsis muaj menyuam. Nyob rau hauv ib rooj plaub, tus neeg siv khoom tau tshaj tawm txo kev sib txhuam hauv lub steerable catheter tom qab peb siv ob-kauj ruam electropolishing txheej txheem uas tsom rau ob qho tib si sab nraud thiab sab hauv. Qhov kev txhim kho no ncaj qha ua rau lub cuab yeej kho mob tau zoo. Lwm zaj lus qhia uas tau kawm yog qhov tseem ceeb ntawm kev tswj cov electropolishing da dej muaj pes tsawg leeg; tsis tu ncua tsom xam thiab ntxiv ntawm electrolyte tiv thaiv kev hloov pauv ntawm cov khoom tshem tawm cov nqi. Cov kev paub dhau los no qhia txog qhov xav tau rau txoj hauv kev zoo rau kev kho saum npoo, sib txuas cov txheej txheem kev txawj ntse nrog kev tswj xyuas kom zoo.

Summary thiab Sublimation​

Nto kev ncaj ncees yog lub hauv ntej ntawm biocompatibility. Kev kho zoo kawg nkaus li niaj zaus phab ntsa hypotube integrates seamlessly nrog lub cev, embodying cov chaw tsim tshuaj paus kev mob siab rau cov neeg mob kev nyab xeeb. Kev nrhiav qhov zoo tshaj plaws saum npoo tiav yog kev taug kev ntawm kev txhim kho txuas ntxiv, uas tau tsav los ntawm kev xav txhim kho cov cuab yeej ua haujlwm thiab txo cov teeb meem. Los ntawm kev paub txog electropolishing, passivation, thiab kev soj ntsuam, peb xyuas kom meej tias txhua lub hypotube tsis tsuas yog ua tau raws li qhov kev xav tau ntawm cov neeg kho mob. Qhov kev cog lus rau kev ua tau zoo no qhia txog qhov tseem ceeb ntawm kev lag luam khoom siv kho mob: kev tsim kho tshiab, zoo, thiab kev khuv leej. Lub phab ntsa hypotube tsis tu ncua, nrog nws qhov flawless nto, dhau los ua qhov pom tsis tau tab sis tseem ceeb ntawm cov txheej txheem kho, ua kom cov txheej txheem uas cawm neeg txoj sia thiab kho kev noj qab haus huv.

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

Atomic layer deposition (ALD) rau ultra-thin coatings thiab ntsuab chemistry hauv kev kho saum npoo yog cog lus. In-line optical soj ntsuam yuav automate zoo tswj. Cov neeg tsim khoom yuav tsum nyob twj ywm ua raws li cov qauv kev hloov pauv biocompatibility thiab xav txog kev kuaj lub neej kom muaj kev nyab xeeb mus ntev. Kev koom tes nrog cov koom haum tshawb fawb tuaj yeem ua kom tau txais kev hloov kho tshiab ntawm cov thev naus laus zis. Raws li qhov kev thov rau cov cuab yeej siv tsawg tsawg zuj zus tuaj, kev tsom mus rau qhov kev ncaj ncees ntawm qhov chaw tsuas yog nce zuj zus, ua rau nws yog qhov sib txawv tseem ceeb hauv kev sib tw toj roob hauv pes ntawm kev tsim khoom siv kho mob. Kev nqis peev hauv kev coj ua kom ruaj khov thiab kev ntsuas qib siab yuav ua rau cov tuam txhab nyob rau hauv lub hauv ntej ntawm qhov chaw tseem ceeb no, kom ntseeg tau tias cov phab ntsa hypotubes tseem ua tau raws li cov qauv siab tshaj plaws ntawm kev ua tau zoo thiab kev nyab xeeb.