Needle Design And Tissue Trauma: Lub Ntsiab Cai Biomechanical Qab Ecchymosis

https://www.mayoclinic.org/tests-procedures/breast-biopsy/about/pac-20384812

Ecchymosis tshwm sim los ntawm lub mis corekoobbiopsy yog, hauv qhov tseeb, qhov teeb meem biomechanical. Cov ntaub ntawv sib txawv, qhov ntev, thiab txoj kab uas hla ntawm cov koob tshuaj biopsy ua rau muaj kev ntxhov siab ntau yam sib txawv thaum cuam tshuam nrog cov ntaub so ntswg ntawm lub mis, cuam tshuam ncaj qha rau qhov tshwm sim ntawm microvascular rupture.

I. Needle Tip Geometry thiab Txiav Efficiency

Cov koob tseem ceeb niaj hnub no feem ntau siv "bevel tip" tsim. Kev tshawb fawb qhia tias lub kaum sab xis (feem ntau yog li ntawm 12℃txog 30 degree) cuam tshuam zoo nrog cov ntaub so ntswg deformation. Cov kaum me me ua rau cov lus qhia ntse dua thiab qis qis zog, tab sis ua kom muaj zog ntxiv rau sab nraub qaum ntawm cov ntaub so ntswg, yooj yim tearing capillaries nyob ib sab. Hloov pauv, cov kaum sab xis loj dua, thaum nthuav tawm me ntsis siab dua qhov kev tawm tsam, muab kev txiav kom huv si thiab ua rau muaj kev puas tsuaj tsawg rau cov hlab ntsha.

II. Cov khoom nruj thiab kev vibration kis tau tus mob

Lub siab elastic modulus ntawm stainless hlau koob (kwv yees li 200 GPa) tiv thaiv dabtsi yog khoov thaum lub sij hawm insertion, zoo converting thrust rau pem hauv ntej kinetic zog. However, this rigidity also means that when encountering dense fibrous tissue or calcifications, the needle shaft generates high-frequency micro-vibrations. Cov kev vibrations no kis tau raws li tus ncej koob mus rau hauv lub mis parenchyma, uas yuav ua rau resonant rupture ntawm capillaries nyob deb ntawm qhov chaw puncture, ua rau "satellite ecchymosis." Nyob rau hauv sib piv, titanium alloy koob (elastic modulus ~ 110 GPa), vim lawv superior damping zog, nqus ib feem ntawm no vibrational zog thiab theoretically txo xws distal ecchymosis.

III. Needle Gauge thiab Tissue Trauma Threshold

Muaj qhov sib txawv ntawm cov khoom siv sib txawv ntawm cov koob siv feem ntau, xws li 14G (sab nraud txoj kab uas hla 2.1 hli), 16G (1.6 hli), thiab 18G (1.2 hli). Raws li Poiseuille Txoj Cai, cov dej tsis kam yog qhov sib npaug ntawm lub zog plaub ntawm lub vojvoog. Qhov no txhais tau hais tias lub zog nqus ntawm 14G koob yog kwv yees li yim npaug ntawm 18G koob. Thaum muaj zog tsis zoo siab ruaj ntseg cov qauv loj, nws kuj ua rau kom cov adsorption thiab tearing rog ntawm cov ntaub so ntswg ib puag ncig, ua rau cov phab ntsa ntawm cov hlab ntsha kom siab dua shear stress, yog li inducing ecchymosis.

IV. Insertion Velocity thiab Strain Rate

Breast tissue is a viscoelastic material whose mechanical response is highly dependent on the loading rate. Rapid insertion (as seen in spring-loaded automatic biopsy guns) subjects the tissue to a high strain rate (>100 / s). Nyob rau hauv cov xwm txheej no, collagen fibers tsis muaj sij hawm los kho, ua rau nkig puas-xws li vascular rupture. Kev tuav qeeb qis qis qis qis qis qis tab sis ua kom ntev lub koob lub sijhawm nyob hauv cov ntaub so ntswg, ua rau muaj qhov tshwm sim ntawm kev sib txhuam rov qab rau cov hlab ntsha. Lub tswv yim zoo tshaj plaws yuav tsum muaj kev nce qib mus kom txog thaum ncav cuag lub hom phiaj mob, ua raws li kev nrawm nrawm kom ua tiav qhov txiav, ntsuas cov ntaub so ntswg ncaj ncees nrog kev tiv thaiv vascular.

V. Kev Cuam Tshuam

Kev nkag siab txog cov txheej txheem biomechanical no pab txhim kho cov txheej txheem biopsy. Piv txwv li, nyob rau hauv cov tub ntxhais hluas cov neeg mob uas ntom, heev vascular ob lub mis, titanium alloy koob ua ke nrog phau ntawv qeeb insertion yog qhov zoo dua. Rau cov neeg laus cov neeg mob nrog ntxhib calcifications, stainless hlau koob ua ke nrog cov hom kev tua ceev ceev tuaj yeem txo qhov kev raug mob ntxiv los ntawm rab koob sib txawv. Nyob rau hauv lub neej yav tom ntej, ntse biopsy koob uas muaj tiag tiag - lub sij hawm quab yuam tawm tswv yim tuaj yeem hloov kho qhov nrawm thiab qhov tob los ntawm kev saib xyuas cov kev hloov pauv hauv cov ntaub so ntswg tiv thaiv, txo qis qhov kev pheej hmoo ntawm ecchymosis.