Ahn J M, Kang D W, Kim H C, Min B G
Department of Biomedical Engineering, College of Medicine, Seoul National University, Korea.
ASAIO J. 1993 Jul-Sep;39(3):M208-12.
As part of an electromechanical total artificial heart (TAH) program, an integrated transcutaneous energy and information transmission (TEIT) system has been developed. In vivo performance of the developed system was evaluated through a simplified animal model without implant of a TAH. The design features include the small size of the implanted part, and dual coil structure of the external part. In the transcutaneous energy transmission (TET) system based on magnetic induction, the external primary and implanted secondary coils have the shape of a truncated cone, 7.0 and 3.8 cm in diameter, and 23 and 12 turns of Litz wire, respectively. The external coil is driven by a 350 to 410 kHz tuned class E amplifier that has a minimum switching loss of power transistor. In vitro test results using 1 cm thick dog's skin showed a flat total efficiency (DC to DC) of 75% for 20 to 30 W of delivered mean power. In order to achieve bidirectional communication between implanted and external components, a small circuit board containing four light emitting diodes and a photodiode was incorporated in each TET coil facing each other across the skin. Unmodulated optical pulse transmitted digital data (9600 baud, RS-232 protocol) in error free condition through an up to 15 mm thick dog's skin patch accommodated 18 degrees of misalignment. Three subacute in vivo studies were conducted in dogs to evaluate performance of the developed system. The secondary set was implanted in the mild flank region of the dog, and the output was percutaneously connected to the control system to drive the external TAH on the mock circulatory system.(ABSTRACT TRUNCATED AT 250 WORDS)
作为一个机电一体化全人工心脏（TAH）项目的一部分，已开发出一种集成式经皮能量与信息传输（TEIT）系统。通过一个未植入TAH的简化动物模型对所开发系统的体内性能进行了评估。其设计特点包括植入部分尺寸小以及外部部分采用双线圈结构。在基于磁感应的经皮能量传输（TET）系统中，外部初级线圈和植入的次级线圈呈截头圆锥形状，直径分别为7.0厘米和3.8厘米，分别由23匝和12匝利兹线绕制而成。外部线圈由一个350至410千赫调谐的E类放大器驱动，该放大器的功率晶体管具有最小开关损耗。使用1厘米厚狗皮的体外测试结果表明，对于20至30瓦的平均输出功率，总效率（直流到直流）稳定在75%。为了实现植入部件与外部部件之间的双向通信，在每个TET线圈中都内置了一个包含四个发光二极管和一个光电二极管的小电路板，两个线圈隔着皮肤相对放置。未调制的光脉冲在无错误条件下通过一块厚度达15毫米、可容纳18度错位的狗皮贴片传输数字数据（9600波特，RS - 232协议）。在狗身上进行了三项亚急性体内研究，以评估所开发系统的性能。次级装置植入狗的侧腹轻度区域，其输出经皮连接到控制系统，以驱动模拟循环系统上的外部TAH。（摘要截选至250字）
