Hideo Saotome

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.

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.

A new type high frequency transformer

In order to realize small power supplies, the authors propose a type of coreless high-frequency transformer. This transformer is composed of simple twisted coils and its operating principle is based on the skin effect of current carrying conductors. Approximate analysis based on the symmetrical current distributions in each of the coil axes has been applied to this transformer. As a result, it has been clarified that the simple analytical model can be used to estimate the rough performance of the transformer. Analytical and experimental studies suggest that twisted coils have versatile possibilities as a high-frequency transformer. >

A neural behavior estimation by the generalized correlative analysis

The authors propose an approach to magnetoencephalogram (MEG) analysis. The problem of obtaining the current signal flow in the brain reduces to the inverse problem, the governing equation of which is written in an integral form. The authors propose a generalized correlative analysis method based on the Cauchy-Schwarz relation to solve the system equation derived from the governing equation. As a result, they have succeeded in estimating current signal flows in the human brain. A comparison between the conventional single dipole model and generalized corrective analyses has demonstrated that the proposed method is far superior to the conventional one. >

Crack identification in metallic materials

A novel formulation for the crack identification problem is proposed. In this formulation, cracks are regarded as the equivalent field or potential sources due to the discontinuity of conductivity at the crack positions. This means that crack identification problems are reduced to the inverse problems of searching for equivalent sources. The system equation of the inverse problems, derived by discretizing the integral equation, is successfully solved by the sampled pattern matching method. As a consequence, fairly good results are obtained even in the case of plural defect problems. >

The locally orthogonal coordinate systems for analyzing inverse problems of magnetostatic fields-applications to magnetocardiogram and magnetoencephalogram

The authors previously proposed the sampled pattern matching (SPM) method to analyze inverse problems in magnetostatic fields. Because of current dipole angle subdivisions, the SPM method essentially requires considerable CPU time. In order to remove the current dipole angle subdivisions, the authors propose a formulation of the SPM method using cylindrical and spherical coordinate systems. Applications of this faster SPM method to the magnetocardiogram (MCG) and magnetoencephalogram (MEG) identify the heart defect and activated brain parts, respectively. >