Abstract

Abstract : This work deals with various aspects of elastance and inertance as they relate to UBA breathing bag design, including non-linear elastance, impedance testing, and methods of inertance reduction and control. The results of this work show that (a) nonlinear elastance may-be useful in dual breathing bag design but not in single bag designs, (b) elastance should be measured statically or quasi-statically rather than dynamically because of potential nonlinearity invalidating forced oscillation analyses, and (c) inertance in water column experiments can be virtually eliminated when water is displaced radially rather than axially during tidal breathing. This results from moving water in a manner which minimizes linear accelerations. Elastance, Inertance, Breathing bag design, Impedance testing

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