Patent ID: 7043296
Filing Date: 2006-05-09
Classification: A61B

Abstract:
1. A biosignal sensing device for sensing a biosignal from a living body as a subject, comprising: an oscillating section for supplying a high frequency signal; an electrode section including an electrode mounted so that said living body as a subject can be in close proximity to or in contact with said electrode, said electrode being coupled to receive said high frequency signal from said oscillating section; a sensing section for sensing a change in impedance that occurs in said electrode receiving said high frequency signal when said living body as a subject is in close proximity to or in contact with said electrode; a signal amplifying section having a filter function to extract a signal according a desired biosignal from a signal corresponding to said sensed change in impedance; and a signal processing section for producing said desired biosignal from said signal extracted by said signal amplifying section, wherein said sensing section produces and supplies a signal indicating a change in reflected-wave level of said high frequency signal corresponding to said change in impedance that occurs in said electrode according to body movement of said living body, and a frequency of said high frequency signal supplied from said oscillating section is preset to a value in a region where said reflected-wave level changes at a high rate according to change in said frequency with respect to a region where said reflected-wave level changes at a minimum rate according to change in said frequency, wherein said desired biosignal is indicative of a respiration rate.