Pulmonary Gas Embolization and the use of the Doppler Ultrasonic Flowmeter for the Detection of Gas Emboli

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Pulmonary Gas Embolization and the use of the Doppler Ultrasonic Flowmeter for the Detection of Gas Emboli

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Title: Pulmonary Gas Embolization and the use of the Doppler Ultrasonic Flowmeter for the Detection of Gas Emboli
Author: Stefano, J; Allegra, C
Abstract: Doppler ultrasonic flowmeter transmitter and receiver wires should be kept separ.ated and shielded wire (coaxial cable) should be used. This will prevent an overloading of the input circuit by the exciter, thus, the demodulator circuit can be precisely tuned to match the transmitter frequency without fear of overload. For a penetration through a hyperbaric chamber coaxial cable should be used. No connectors or strain boxes should be used except at the receiver circuit, as these cause a severe loss. in signal. Teflon-coated wire in a coaxial chamber penetration has been found to have extremely poor signal carrying capacity and therefore it is highly recommended that they not be used. A rubber stopper with holes drilled to fit the coaxial cable have been found to giye excellent results. The stopper should be inserted from the inside of the chamber and sealed with silicone . A number eight stopper has been tested up to ten atmospheres of pressure with no leaks or blow-outs found. Outside interference to the Doppler can be reduced by surrounding the machine with a grounded metal mesh box. The Doppler model 950 (Parks Electronics Laboratory, Oregon), has certain optional setting.s and procedures for use in detecting circulating gas emboli. [Editor's note: Problems and Solutions]
Description: The items forming the Rubicon Research Repository Christian J. Lambertsen collection are generously donated by the Lambertsen Family. All items in this collection are released through Creative Commons Attribution + Noncommercial + ShareAlike (BY-NC-SA) licenses in an attempt to encourage the use of these works to further scientific understanding of physiology.
URI: http://archive.rubicon-foundation.org/10918
Date:

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