下腔静脉植入式呼吸辅助器实验室研究(Ⅰ)——阻力特性及氧气传递研究

In Vitro Testing of the Intravenacaval Respiratory Assist Device (Ⅰ)——Pressure Drop Characteristics and Oxygen Transfer Performance

采用自行研制的下腔静脉呼吸辅助器（ＩＶＯＸ），进行了实验室研究。阻力特性实验（实验段分别采用刚性管和柔性管）结果表明，ＩＶＯＸ的植入给下腔静脉带来了一定的附加阻力压降，刚性管压降较柔性管压降大，尺寸越大的ＩＶＯＸ在两种实验段的压降差别越大。通过水中的氧气传递实验发现，ＩＶＯＸ的氧合能力随水流量、氧气流量的增加而增加，进口氧浓度越低，氧合效率越高。在出口压力一定时，为防止出现气泡，应控制氧气流量，并考虑采用真空抽气方法。

The intravenacaval respiratory assist device(IVOX) of three different sizes developed by the present authors were evaluated experimentally in vitro.The tests using in turn two different test chamber materials(rigid and elastic)showed that a pressure drop occured.The pressure drop was higher in rigid test chamber than that in the elastic one,and the pressure drop difference between these two kinds of chamber increased with the diameter of the bundle of IVOX. Oxygen transfer rate, with water as the medium in the tests,was augmented with increasing water flow rate and gas flow rate,and with decreasing inlet oxygen concentration in water.It was concluded that, to avoid bubbles produced by IVOX,the gas flow rate should be controlled with fixed outlet water pressure,and vacancy be used in the effluent gas system.