Tsujimura Shinichi, Yamagishi Hiroto, Sankai Yoshiyuki
Cybernics Laboratory, Systems and Information Engineering, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8573, Japan.
Annu Int Conf IEEE Eng Med Biol Soc. 2009;2009:4110-5. doi: 10.1109/IEMBS.2009.5334021.
In order to minimize infection risks of patients with artificial hearts, wireless data transmission methods with electromagnetic induction or light have been developed. However, these methods tend to become difficult to transmit data if the external data transmission unit moves from its proper position. To resolve this serious problem, the purpose of this study is to develop a prototype wireless data communication system with ultra high frequency radio wave and confirm its performance. Due to its high-speed communication rate, low power consumption, high tolerance to electromagnetic disturbances, and secure wireless communication, we adopted Bluetooth radio wave technology for our system. The system consists of an internal data transmission unit and an external data transmission unit (53 by 64 by 16 mm, each), and each has a Bluetooth module (radio field intensity: 4 dBm, receiver sensitivity: -80 dBm). The internal unit also has a micro controller with an 8-channel 10-bit A/D converter, and the external unit also has a RS-232C converter. We experimented with the internal unit implanted into pig meat, and carried out data transmission tests to evaluate the performance of this system in tissue thickness of up to 3 mm. As a result, data transfer speeds of about 20 kbps were achieved within the communication distance of 10 m. In conclusion, we confirmed that the system can wirelessly transmit the data from the inside of the body to the outside, and it promises to resolve unstable data transmission due to accidental movements of an external data transmission unit.
为了将人工心脏患者的感染风险降至最低，已开发出利用电磁感应或光的无线数据传输方法。然而，如果外部数据传输单元偏离其正确位置，这些方法往往会变得难以传输数据。为了解决这一严重问题，本研究的目的是开发一种超高频无线电波无线数据通信系统原型并确认其性能。由于其高速通信速率、低功耗、高抗电磁干扰能力以及安全的无线通信，我们的系统采用了蓝牙无线电波技术。该系统由一个内部数据传输单元和一个外部数据传输单元（各为53×64×16毫米）组成，每个单元都有一个蓝牙模块（射频场强：4 dBm，接收器灵敏度：-80 dBm）。内部单元还具有一个带8通道10位A/D转换器的微控制器，外部单元还具有一个RS-232C转换器。我们将内部单元植入猪肉中进行实验，并进行数据传输测试，以评估该系统在组织厚度达3毫米时的性能。结果，在10米的通信距离内实现了约20 kbps的数据传输速度。总之，我们证实该系统能够将体内数据无线传输到体外，有望解决因外部数据传输单元意外移动导致的数据传输不稳定问题。
