Young S T, Chan K H, Chen C F
Institute of Medical Engineering, National Yang-Ming Medical College, Taipei, Taiwan, ROC.
Med Instrum. 1987 Oct;21(5):266-8.
A new method is proposed to detect the entrance of a needle into the epidural space. Measuring the changes in electric resistance during the insertion of the needle through different tissues in the interspinal space can help anesthesiologists judge whether and when the needle has entered the epidural space. This preliminary, animal study showed that the proposed method performed quite satisfactorily. The electric resistance of the tissues in the interspinal space varied from 1.57 +/- 1.22 k omega to 2.93 +/- 1.14 k omega, and the resistance of the epidural space varied from 9.00 +/- 1.12 k omega to 14.64 +/- 1.25 k omega. The difference was statistically significant (p less than 0.001). This difference in the resistance can be used to verify placement of the tip of the needle in the epidural space and help anesthesiologists administer epidural anesthesia.
提出了一种检测针进入硬膜外腔的新方法。在针穿过椎间隙不同组织的过程中测量电阻变化，有助于麻醉医生判断针是否以及何时进入了硬膜外腔。这项初步的动物研究表明，所提出的方法表现相当令人满意。椎间隙组织的电阻在1.57±1.22千欧至2.93±1.14千欧之间变化，而硬膜外腔的电阻在9.00±1.12千欧至14.64±1.25千欧之间变化。差异具有统计学意义（p<0.001）。这种电阻差异可用于验证针尖在硬膜外腔的位置，并帮助麻醉医生实施硬膜外麻醉。
