Grianti F, Montecchia F, Di Bari L, Baldassarri M
Institute of Physics and Bioengineering, University of Urbino, Italy.
IEEE Trans Biomed Eng. 1996 Nov;43(11):1062-72. doi: 10.1109/10.541248.
The paper describes the general characteristics of a newly developed nonconstant-flow generator for automatic ventilation of the lungs. It is known that the application of very high pressure to high internal resistance leads to a very stable flow, in that the flow itself is unaffected by external load (patient) variations. The stability of the flow means that the inspiratory process can be controlled by means of the ventilated volume, thus extending DIGIT utilization to high resistance patients. The modulation of the flow is implemented via a digital electromechanical system, which allows the ventilator functions to be accurately programmed. The desired flow waveform is obtained by means of a series of pneumatic valves, the apertures of which are digitally controlled. The design is innovative in that it allows the flow waveform in each of the ten digitalized time steps into which each inspiratory phase is divided to be both programmed and controlled. Other ventilators commercially available and currently in use do not have this functional capability, as they are all designed to model the integral flow of the inspiratory waveform without being able to modify the subunit time steps of a single inspiratory phase. The paper also discusses the results of fundamental tests concerning the performance characteristics of the ventilator.
本文描述了一种新开发的用于肺部自动通气的非恒流发生器的一般特性。众所周知，对高内阻施加非常高的压力会导致非常稳定的气流，即气流本身不受外部负载（患者）变化的影响。气流的稳定性意味着吸气过程可以通过通气量来控制，从而将数字积分发生器的应用扩展到高阻力患者。气流的调节通过数字机电系统实现，该系统允许对呼吸机功能进行精确编程。所需的气流波形通过一系列气动阀获得，这些阀的孔径由数字控制。该设计的创新之处在于，它允许对每个吸气阶段所划分的十个数字化时间步长中的每一个步长的气流波形进行编程和控制。目前市场上在售且正在使用的其他呼吸机不具备这种功能，因为它们都是设计用于模拟吸气波形的整体气流，而无法修改单个吸气阶段的子时间步长。本文还讨论了关于该呼吸机性能特性的基础测试结果。
