Abstract
A new model of percutaneously accessible left ventricular assist device (MAD Type-4) was developed. The system was composed of a pneumatic driven sac type blood pump with 30ml of stroke volume and a cannula. To reduce the flow resistance of inflow and outflow valves, a truncated conical jellyfish valve (TC-JFV) and skirt valves (S-V) were designed. The driver was programmed to provide diastolic augmentation. In the mock circulation study, the maximum flow of 2.34l/min was obtained. In the animal experiment, the cannula was inserted from the subclavian artery and sent into the left ventricle. In the effective case, the aortic flow and the coronary flow increased by 20% and 34%, respectively. In conclusion, the MAD Type-4 could obtain the maximum flow of more than 2l/mmn and provided the effective circulatory assistance in severe circulatory failure.
