Measuring Tuohy Needle Insertion Force on a Porcine Spine

This source preferred by Venky Dubey

Authors: Vaughan, N., Dubey, V.N., Wee, M.Y.K. and Isaacs, R.

Start date: 17 May 2012

This study aims to measure the pressure exerted on a Tuohy needle during epidural insertions in the lumbar region. Seventeen epidural insertions have been performed on a porcine cadaver in the lumbar region using the developed system. The range of peak pressures caused by porcine ligamentum flavum was measured between 470-500 mmHg (62.7-66.7 kPa), equivalent to 11.1 – 11.8 Newtons of force on the plunger, beyond this the epidural space caused a loss of pressure. The resulting pressure-time graphs show the changing pressures on the Tuohy needle during insertion from the skin through the ligaments to the epidural space. These measurements will be used to configure a haptic device for epidural simulators.

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