Toray Engineering Company, Limited

The Ritsumeikan Trust

Toray Industries, Inc.

Yusuke Sakaue

Chisa Inaka

Tatsuya Okada

Masaaki Makikawa

Masayasu Yoshiwaki

Junichi Matsumura

An in vivo potential measurement device includes an insulating member and an amplifier. The insulating member has an electrode. The insulating member is inserted into an organ of a living body such that an outer peripheral face of the insulating member contacts with an inner wall face of the organ at a contact site. The electrode senses electric potential at the contact site. The amplifier amplifies the electric potential to obtain output voltage. The amplifier has input capacitance Cin and input resistance Rin that satisfy Cin/Ce&#x3e;0.1 and 1/(2&#x3c0;fCeRin)&#x3e;0.1, where Ce represents capacitance of the insulating member at the contact site, and f represents frequency of the electric potential at the contact site on the inner wall face. A contact state between the outer peripheral face and the inner wall face is evaluated using the output voltage.

In vivo potential measurement device

In an in-vivo signal source detection method, three electrodes are arranged on the circumference of a surface of an living body to surround multiple muscle fibers; a first voltage Vgenerated when a first external resistor is connected to between each electrode and a ground potential and a second voltage V'generated when a second external resistor is connected to between each electrode and the ground potential; and a ratio V/V&#x2032;is calculated from the first voltage Vand the second voltage V&#x2032;, and the position of a signal source in the living body is detected based on three ratios V/V&#x2032;.

In-vivo signal source detection method and in-vivo signal source detection device

A method for detecting a position of a signal source in a living body includes: arranging three electrodes on a surface of the living body and alternately connecting a first external resistance and a second external resistance in parallel between the electrodes and a ground potential; measuring first voltages V(i=1, 2, 3) generated at the respective electrodes when the first external resistance is connected in parallel between the electrodes and the ground potential, and second voltages V(i=1, 2, 3) generated at the respective electrodes when the second external resistance is connected in parallel between the electrodes and the ground potential; and calculating three ratios V/V'(i=1, 2, 3) from the first and second voltages Vand V&#x2032;, and detecting the position of the signal source in the living body based on the three ratios V/V&#x2032;(i=1, 2, 3).

Method for detecting position of signal source in living body, and device for detecting position of signal source in living body

Growing community of inventors

Shiga, Japan

Yusuke Sakaue