Since the introduction by Quincke1 of an apparatus for estimating the cerebrospinal pressure, there have been numerous criticisms of the mechanics of the instrument and several attempts have been made, either to modify his apparatus, or to introduce a new principle. As devised by Quincke, the apparatus consists of the ordinary puncture needle and trocar, to which is attached a long piece of rubber tubing leading to an S-shaped piece of bent glass. According to the height to which the latter has to be raised the pressure is estimated, the reading being taken from the level of the hilt of the needle to the level of the fluid in the glass tube; this is measured by an independent centimeter scale. The imperfections in the use of this instrument are the following:
First, between the time when the trocar is withdrawn from the needle and the moment when the rubber
CROHN BB. AN IMPROVED APPARATUS FOR ESTIMATING THE PRESSURE IN THE CEREBROSPINAL SYSTEM. JAMA. 1911;LVI(13):962–964. doi:10.1001/jama.1911.02560130026012
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