Improved pneumatic control system design for a cardiopulmonary resuscitation system

摘要

An improved pneumatic control system inflates and deflates an inflatable CPR vest (10) in a controlled manner. The control system (18) adapts to the non-linear vest pressure time curve during deflation of the vest (10) caused by the nonlinear behavior of the chest, especially toward the end of the deflation cycle. The computer controlled system governs the inflation and deflation of the vest (10) within a preset range of vest operating conditions using a deflation algorithm to predict vest pressure, including vest bias pressure (Pb). The control system (18) also provides alarms and automatic system shutoff when certain parameters in the inflation/deflation cycle are not met. Integrated as part of the pneumatic control system is a pneumatic system that includes a reservoir (64) recharged during the deflation cycle. The pneumatic system is disclosed including alternatively a motorized pump (32) to recharge a reservoir (64) and a high-pressure air tank (22) to recharge the reservoir.