Tamotsu Katane

Power and Interactive Information Transmission to Implanted Medical Device Using Ultrasonic

In this paper, we propose the power supply and the bi-directional information transmission system using ultrasonic. Ultrasonic does not interfere with the electronic circuits of implanted devices and is safe for a living body. Previously, we have clarified experimentally that ultrasonic is applicable to power and information transmission. This study deals with improving information transmission speed from the inside to the outside of the body. The new system uses two transmission paths, Path 1 and Path 2. Each path consists of a pair of piezo oscillators. Path 1 transmits a carrier wave and Path 2 echoes back the inside information. As a result, the transmission speed increases to 9.6 Kbps from 600 bps without errors. Additionally, several types of information, such as text, static and motion image files can be transmitted. The proposed system can be applied to various medical applications.

Electric power-generating system using magnetic coupling for deeply implanted medical electronic devices

This paper proposes an innovative electric power supply system for medical devices implanted deeply, using a low-frequency magnetic field. It is composed of a permanent-magnet coupling and a small generator. The system provides sufficient power at deep positions, adopting two kinds of acceleration. A prototype experiment is carried out and it is verified that the system is able to provide power at deep positions in the human body.

Power and Information Transmission to Implanted Medical Device Using Ultrasonic.

Using ultrasonic, we propose here a novel method of transmitting power and information to implanted medical equipment. The proposed system is composed of two piezo oscillators and has the following functions: transmission of power and control information to an implanted device, and transmission of the information acquired by an implanted device to the outside of a living body. With amplitude shift keying (ASK), 9.5 Kbps is obtained for the proposed information transmission system.

Fundamental study of an electric power transmission system for implanted medical devices using magnetic and ultrasonic energy

Abstract In this paper, the authors propose a novel electric power supply system for implanted medical devices. The system is noninvasive and uses two kinds of energy, magnetic and ultrasonic. The system can provide high power levels harmlessly. The energies are obtained by two types of vibrator, i.e., piezo and magnetostriction devices. A prototype was built and it was verified experimentally that the system is basically able to provide power. At high frequencies, such as 100 kHz, the output power was higher than the conventional system using a transformer. The normalized output power per unit volume also exceeded the transformer system.

A high frequency iron loss measuring system

A high performance iron loss measuring system is introduced by using an 8-bit microcomputer, a two-channel memory device with high speed A/D converters and a wide band power amplifier. A required time to obtain a datum of one experimental point is about one minute when the error between the desired maximum flux density and the settled one is allowed within 0.5%. This system makes it possible to measure iron losses in the frequency range up to 1MHz. The results have a good correlation to the measured results by using the U-Function Meter.

Optimum core dimensions of transformer for switching power supplies

A new method for designing high frequency power transformers economically is proposed. In contrast to the conventional method, only the temperature rise is given at first and the core shape and winding result from the method. In this study a new design factor, which brings about an optimum transformer, is also introduced.<<ETX>>

Measurement and Analysis of Reflex Responses to Perturbation during Walking-Towards the Realization of Artificial Reflex

Reflex responses play an important role in gravity resistance, balance maintenance and the reaction to perturbation during human walking and standing upright. In this study, aiming at the realization of artificial reflex for paralyzed people, whose reflexive system was also impaired to a certain degree because of the weakened afferent neural pathway, the reflex responses of normal subjects were measured and analyzed. Not only the sensors for measuring muscle activation, but also the sensors for measuring body motion were employed. The spatiotemporal relation between muscle activity and body motion was qualitatively analyzed. Moreover, the candidates for artificial reflex triggering signal were identified for further investigation

Ferroresonant type DC power supply controlled by fully magnetic technique

A recently developed high-frequency magnetically controlled ferroresonant-type DC power supply is presented. The resonant voltage is controlled by applying an external field through an electromagnet to both sides of the saturable core. The voltage drop on the DC side of the power supply is offset by feeding the output current back to the winding of the electromagnet. The output voltage regulation due to load-current changes is 1% or less, and the transient performance is very high. The control-loop diagram for the power supply is presented. >

Analysis of ferroresonant type DC power supply controlled by fully magnetic technique

A high-frequency magnetically controlled ferroresonant-type DC power supply is presented. The resonant voltage is controlled by applying a external field through an electromagnet to the resonating reactor core in a diametrical direction. The voltage drop on the DDC side of the power supply is compensated for by feeding the output current back to the winding of the electromagnet. Static and dynamic characteristics of the supply are analyzed by using a control loop diagram. A theoretical criterion resulting in zero voltage regulation is established on the basis of the control loop diagram.<<ETX>>

Electric power generating system using magnetic coupling, for medical electronic devices implanted deeply

Summary form only given. Safe electric power provision to medical implants, such as pacemakers and artificial hearts, is much needed, because those medical devices are becoming more sophisticated. Up to the present, several noninvasive methods of transmitting power to a rechargeable battery for implanted medical devices have been reported. In this paper, we propose a novel electric power provision system to a medical implant at a deep position in the body. A permanent magnet rotor is set up outside the body. Another permanent magnet rotor, in which a generator has been installed, is implanted. The magnets of the rotors have magnetic coupling each other. When the rotor outside the body rotates, the other rotor in the body synchronously rotates and the electric power is generated from the mechanical power.