Txhais Kev Coj Tus Cwj Pwm 'Acoustic Enhancement Process

https://profed.olympuschina.com/gs/thoracicsurgery/12628/

Ib qho kev sib tw loj hauvEBUSCov txheej txheem yog pom lub koob nyob rau hauv daim duab ultrasound, tshwj xeeb tshaj yog thaum lub sij hawm pib nkag los yog thaum lub koob ncej mus txog ib tug ntiav kaum txheeb ze rau lub ultrasound beam. Polished hlau ua rau specular xav; Yog hais tias lub reflected ultrasound nco lub transducer lub txais tos lub kaum sab xis, lub koob zoo li fragmented los yog vanishes tag nrho. Cov neeg ua haujlwm tom qab ntawd tso siab rau cov lus tawm tswv yim los kwv yees qhov tob- ua kom muaj kev pheej hmoo ntawm vascular perforation lossis ua tsis tau raws li kev kuaj.

Kev coj cwj pwm EBUS-TBNA koob kov yeej qhov no los ntawm laser micro-machining "artificial acoustic scatterers" rau ntawm rab koob ncej. Siv nanosecond/picosecond fiber ntau lasers, lawv ablate helical micro-grooves los yog annular dot matrices (dav 20-50μm, qhov tob 3-10μm) rau ntawm lub raj sab nrauv. Qhov no cuam tshuam cov iav hlau txuas ntxiv, ua rau ntau qhov kev xav sab hauv hauv microstructures. Qhov cuam tshuam loj heev backscatter tshwm sim nyob rau hauv lub ultrasound saib raws li ib tug heev pom, tsis tu ncua ci kab -lub sij hawm lub"Lighthouse nyhuv"hauv kev lag luam.

Qhov kom zoo dua ntawm 5-axis laser system yog nyob rau hauv kev tswj kom tsis tu ncua linear tshaj tawm thiab zoo ib yam planar inclination thoob plaws lub cylindrical curvature. Helical grooves qhwv lub koob ncej nrog lub suab sib xws (feem ntau yog 0.2-0.5mm), kom ntseeg tau cov yam ntxwv ntawm cov ncha ruaj khov tsis hais txog ntawm rab koob qhov kev hloov pauv. Lub cheeb tsam etched feem ntau npog qhov ua haujlwm 5-30mm ntu tom qab rab koob (tsis suav nrog qhov kawg ntawm lub apex kom khaws lub zog puncture); qee cov qauv kuj tseem muaj cov cim kos rau ntawm qhov sib thooj rau cov ntaub ntawv siv. Kev coj ua piv txwv txhua pawg tsim khoom rau kev sim hauv cov ntaub so ntswg-Mimicking Phantoms (TMPs), ntsuas qhov sib piv-rau-Noise Ratio (CNR) tiv thaiv qhov kev pom qhov tsawg kawg nkaus ua ntej tso tawm.

Nws yog ib qho tseem ceeb kom nco ntsoov tias kev sib sib zog nqus tob tob, thaum txhawb nqa echogenicity, tuaj yeem tsim cov ntsiab lus kev ntxhov siab. Kev coj cwj pwm siv Finite Element Analysis (FEA) simulations los txhais qhov tob ntawm kev nyab xeeb- rau - qhov dav qhov sib piv, ntsuas lub suab nce nrog lub zog torsional. Tsis tas li ntawd, cov kauj ruam electropolishing subtly rounds etched npoo- cov txheej txheem saw yuav tsum tau muab xam meej ("Laser reserved depth - Electropolishing removal=Final functional depth"), reflecting the producer's processability. Rau cov neeg xa khoom thiab kawg-cov neeg siv, xaiv EBUS-TBNA koob nrog cov laus laser etching tov ncaj qha rau kev txhim kho kev nyab xeeb thiab kev kawm luv luv.