Heart beat/respiration measuring device
A heart beat/respiration measuring device comprising a sensor adapted to be pressed against the human body, and a measuring circuit for measuring heart beats and respiration from the output of the sensor. The sensor includes a coil member elastically deformable when subjected to pressure by being pressed against the human body. The measuring circuit comprises an LC oscillation circuit wherein an inductance component and a capacitance component of the coil member serve respectively as a coil L and a capacitor C for oscillation, and a calculation processing circuit for detecting variations in the oscillation frequency of the LC oscillation circuit and calculations of a cardiac cycle, heart rate, respiratory cycle and respiration rate based on the frequency components of heart beats and respiration are included in the variations.
1. A heart beat/respiration measuring device comprising:
a mat;
a sensor ( 2 ) disposed in a recess in said mat and adapted to be pressed against a human body as the human body lies on said mat; and
a measuring circuit for measuring heart beats and/or respiration from the output of the sensor ( 2 ),
the sensor ( 2 ) comprising a coil member comprising a wire wound around an elastic member having a hollow portion and being elastically restorably deformable with subjected to pressure by being pressed against the human body, and
the measuring circuit comprising an LC oscillation circuit ( 3 ) wherein an inductance component and a capacitance component of the coil member serve respectively as a coil L and a capacitor C for oscillation, and a calculation processing circuit ( 4 ) for detecting variations in the oscillation frequency of the LC oscillation circuit ( 3 ) and calculating physiological data in accordance with heart beats and/or respiration based on the frequency component or components of heart beats and/or respiration included in the variations.
2. A heart beat/respiration measuring device according to claim 1 , wherein the sensor ( 2 ) is installed in a posture in which the pressure acts in a direction orthogonal to a winding axis of the coil member.
3. A heart beat/respiration measuring device according to claim 1 , wherein the sensor ( 2 ) is installed in a posture in which the pressure acts in a direction along a winding axis of the coil member.