Dab tsi muaj dilator thiab sheath extrusions?
Dilators thiab sheaths yog ib khub txuas ntawm cov txheej txheem ntxiv nrog rau hauv txheej vascular qhia txheej. Cov txheej txheem ua kom paub pib muaj cov khoom siv los siv kom nkag mus rau cov hlab ntshav rau ntxig rau ntawm vascular catheters. Tom qab ib rab koob tau tso rau hauv daim tawv nqaij thiab nkag rau hauv cov hlab ntshav, cov dilator thiab sheath yog kis ua ke rau hauv cov hlab ntshav.
Qhov ntev tapered ntxeev ntawm dilator ua rau ncab qhib qhov qhib ntawm daim tawv nqaij thiab cov hlab ntshav kom tso cai rau kev nkag mus ntawm cov hnab riam ntau dua. Lub dilator yog tom qab tau muab tshem tawm, tawm tsuas yog cov hnab ntaws ntxig rau hauv cov hlab ntshav, muab ib qho chaw nres nkoj los ntawm qhov uas muaj ntau yam txuas ntxiv tuaj yeem tso.
Qee tus qhia ua ke koom nrog kev sib thooj sib luag kom tso cai rau kom cov kws ntaus nrig txhawm rau txhawm rau ntxiv thiab tshem tawm thaum tiv thaiv kom ntshav tsis txhob dim. Lwm tus taw qhia yog tsim los sib cais hauv ib nrab thiab tev tawm tom qab ntxig, tawm mus tom qab tsuas siv cov khoom siv catheter.
Dab tsi polymers yog dilator thiab sheath teeb tsa feem ntau ntawm thiab vim li cas?
Polypropylene - Lub stiffest ntawm cov polymers siv, nws yog feem ntau siv rau ntxig moulded txuas thiab dilators xav tau lub zog siab, xws li cov uas siv hauv cov ntawv thov bariatric. Nws yog qhov qis kawg ntawm cov polymers uas tau teev tseg ntawm no, tab sis yog cov roj ntau dua li cov elastomers siv rau cov kws txuas. Nws yooj yim lees txais xim xim thiab radiopaque sau, thiab yog ntawm cov tsis muaj kim kim polymers muaj.
Polyethylene - Cov khoom siv ntom ntom ntom ntaws (HDPE) thiab tsis tshua muaj qhov ntom polyethylene (LDPE) yog cov muaj pes tsawg txhav nrog cov durometers ntawm kwv yees li 50D thiab 40D feem. HDPE, LDPE, lossis qhov sib xyaw ntawm ob, yuav siv tau rau cov qauv dilators thiab cov hnab riam. Polyethylene tau zoo lubricity thiab yooj yim lees txais xim xim, radiopaque fillers thiab yog cov tsis tshua muaj cov khoom kim kim muaj.
FEP - Qhov muag muag ntawm cov polymers siv, nws yog siv los tsim cov hnab riam uas qhov chaw lubricity yog qhov tseem ceeb. FEP yog ib qho yaj ua extrudable fluorinated polymer nrog lubricity zoo heev, thib ob tsuas yog mus rau ETFE (PTFE yog cov fluoropolymer zoo tshaj plaws tab sis nws tsis yaj ua tiav). Radiopaque cov ntawv sau thiab cov xim xim muaj ntau nyuaj rau kev koom ua ke hauv FEP, thiab nws tseem kim dua li polypropylene lossis polyethylene.
ETFE - Nrog lub siab tawv dua li FEP, feem ntau yog siv los tsim cov hnab riam cov khoom nyob qhov twg lubricity yog qhov tseem ceeb tshaj thiab txhav txhav yuav tsum muaj. ETFE yog cov tshuaj pleev ua rau feem ntau cov roj lim extrudable polymer. Zoo li FEP, nws yog kev sib xyaw ntawm cov ntawv sau ntim radiopaque thiab cov xim xim coj los ua qee qhov kev sib tw thiab nws tseem kim dua polypropylene lossis polyethylene thiab piv rau FEP.
Cov ntaub ntawv dab tsi raug siv los ua radiopaque fillers rau dilator thiab sheath teeb tsa?
Barium Sulfate yog thawj lub tshuab pa radiopaque siv dav hauv kev kho mob. Nws yog qhov pheej yig pheej dawb hmoov uas muaj cov txheej txheem zoo heev. Yuav tsum muaj qhov siab hnyav rau kev sib piv ntawm lub tshuab pa hluav taws xob rau lwm qhov chaw ntim. Vim hais tias nws muaj qhov tsis zoo tinting lub zog, nws yog qhov yooj yim rau xim.
Bismuth Subcarbonate muaj ntau dua radiopacity uas barium sulfate thiab tuaj yeem muab ntxiv rau hauv qhov ntau me me kom ua tiav cov txiaj ntsig sib piv. Nws yog cov hmoov dawb dawb nrog tinting lub zog loj, yog li limiting xim txuam nrog qee qhov xwm txheej. Nws tsuas yog txwv los ntawm kev ua cov txheej txheem kub (yaj daj ntawm 400 F) thiab qee cov polymers (tsis sib xws nrog thermoplastic polyurethanes).
Bismuth Trioxide tseem muaj cov hluav taws xob zoo heev hauv qhov sib piv cov khoom thauj qis thiab siv tau nrog ntau cov polymers. Nws muaj xim daj thiab muaj peev xwm tig xim av los ntawm kev ua kom txias, txwv cov xim kom haum. Cov npoo nyob rau qhov chaw tiav lawm tsuas yog siv cov phab ntsa nyias nyias thiab qhov tseem ceeb hauv cheeb tsam.
Bismuth Oxychloride muab radiopacity zoo heev thiab ua tau zoo nrog ntau cov polymers. Nws yog qhov kub tshaj ruaj khov dua bismuth subcarbonate. Dawb 'platelet-like' particles muab qhov du, pearlescent tiav ntawm cov khoom siv. Qhov no tuaj yeem muab cov kev txwv kom pom tseeb cov xim sib tw.
Tungsten yog cov hlau ua tau hnyav heev uas tau sib haum nrog zoo rau txhua tus polymers ntawm cov khoom hnyav heev los ntawm qhov hnyav. Nws yog xim grey tsaus nti hauv xim thiab tsim cov matte tiav nyob rau hauv cov chaw siab, muab kev txwv ntau rau cov xim txuam.
Polymer tebchaw nrog tungsten tuaj yeem ua rau muaj kev cuam tshuam zoo ntawm kev ua cov khoom siv. Txawm li cas los xij, nws yog qhov muab tub lim xaiv xaiv hauv cov khoom siv nyias-walled qhov twg radiopacity yog qhov tseem ceeb.
Cov khoom siv khomob twg, cov khoom siv ntawm lub cev lossis cov txheej txheem yog qhov no ib txwm siv?
Kev siv cov plob hau plua tshauv thiab sheaths yog hom rau cov ntawv thov intravascular catheter. Ntau qhov ntau thiab tsawg kuj muaj rau cov txheej txheem uas nquag muaj xws li cov kab hauv nruab nrab.
Kev coj tus yam ntxwv tsis zoo thiab tsis zoo yuav xav kom muaj tus txheej txheem kev cai ua kom haum rau qhov loj thiab cov txheej txheem kev thov ntawm lub tshuab raj txuas.
Vim li cas Barty yog qhov kev xaiv zoo tshaj plaws rau cov khoom no?
Barty tau yog ib tus thawj coj hauv kev qhia cov cuab yeej kho mob los tau ntau xyoo. Peb cov kws txawj yog cov kws tshaj lij hauv cov ntaub ntawv tsim khoom thiab thev naus laus zis los muab cov txiaj ntsig siab uas koj ntseeg tau. Tham nrog tus kws tsim choj lossis tus sawv cev muag khoom thiab nrhiav seb peb yuav muab peb cov kev txawj ntse los ua haujlwm rau koj li cas.