人工心臓用経皮的双方向高速デジタル伝送システムの開発と小型化

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  • Development and Improvement of a Transcutaneous Bi-directional Data Transmission (TDT) System for an Artificial Heart.

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We have developed and improved a transcutaneous electromagnetic bi-directional data transmission system for an artificial heart. In this system, ASK (Amplitude Shift Keying) modulation with carrier frequencies of 4 MHz and 10 MHz is employed in consideration of electromagnetic permittivity into tissue, and which involves less interference for bi-directional transmission. To miniaturize each TDT unit size, the TDT system consists primarily of a one·chip microcomputer with circuit boards designed by CAD and CAM technology. The model for molding the electronics circuit is designed by CAD, and manufactured by CAM and a 3-axial NC machine. The size of each unit is 45 mm in diameter and 8 mm in thickness. In vitro experimental results showed that the TDT system could transmit data, via a transcutaneous energy transmission system, a within an area of axial direction of 7.5 cm and a radial direction of 4 cm without interference. The results of animal experiments in which the TDT system was implanted inside a goat showed excellent fitting and stable operation during a period of 87 days. This demonstrates the convenience of the TDT system for transcutaneous bi-directional communication in an implantable artificial heart system.

収録刊行物

  • 人工臓器

    人工臓器 29 (2), 301-307, 2000

    一般社団法人 日本人工臓器学会

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