Takumi Yonezawa

TL;DR: Neodymium-yttrium-aluminum- garnet (Nd-YAG) laser devices have been improved for easy and safe use, and a new tip type pressure transducer has been made for improved therapeutic results using this new method.

TL;DR: Results indicate that the use of a conductance- and arterial pressure-based method (1/R control) to determine TAH cardiac output is determined and a control method for the TAH is determined that avoids hemodynamic abnormalities exhibited by other TAH control systems and that exhibits physiological responses to exercise and daily activities under the conditions tested.

TL;DR: The results suggest that a jellyfish valve (Model-1) is useful in ventricular assist devices, and in short-term bridge use of a total artificial heart.

TL;DR: The fabrication of the jellyfish valve is introduced, and in vitro and in vivo results summarized, and the valve is superior in performances to a Björk-Shiley valve, and reveals good blood compatibility.

TL;DR: A flow transformed pulsatile total artificial heart (FTPTAH), in which the continuous flow from a single centrifugal pump was converted to pulsatile flow by switching two three-way valves that could alternately perfuse the systemic and pulmonary circulation, was proposed, and the data from the prototype model were reported.