BLOOD VESSEL CHARACTERISTICS MEASURING APPARATUS AND BLOOD VESSEL CHARACTERISTICS MEASURING METHOD
First Claim
1. A blood vessel characteristics measuring apparatus, comprising:
- a sensor unit provided at a position opposed to a measurement region of a subject, the sensor unit including a light-emitting part configured to emit light onto the measurement region and a light-receiving part configured to contactlessly receive the light propagated through the measurement region;
a blood flow measuring part configured to measure a displacement of a blood vessel and a displacement of a tissue around the blood vessel caused by a blood flow in the measurement region based on a light intensity at a time of receiving the light emitted from the light-emitting part in the light-receiving part;
a blood vessel displacement deriving part configured to derive a displacement of a wall of the blood vessel based on the displacement of the blood vessel and the displacement of the tissue around the blood vessel obtained by the blood flow measuring part;
an electrocardiographic measurement part configured to measure an electrocardiographic signal of the subject; and
a blood vessel condition deriving part configured to derive a condition of the wall of the blood vessel at each of measurement positions based on a difference between a waveform of the electrocardiographic signal and a detection signal waveform obtained from the light-receiving part.
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Accused Products
Abstract
The blood vessel characteristics measuring apparatus 100 includes a blood flow measuring unit 20 held at a position opposed to a skin surface 10 of a measurement region of a subject, an optical sensor unit 30 housed in the blood flow measuring unit 20, an electrocardiograph 40, and a controller 50. The controller 50 includes a blood flow measuring part 60, a blood vessel displacement deriving part 70, and a blood vessel condition deriving part 80. The blood flow measuring part 60 measures the displacements of a blood vessel and tissues around the blood vessel caused by a blood flow based on light intensity at the time of receiving light emitted from a light-emitting part 32 of the sensor unit 30 in light-receiving parts 34 and 36. The blood vessel displacement deriving part 70 derives the wall of the blood vessel 12 based on the displacements of the blood vessel and tissues around the blood vessel. The blood vessel condition deriving part 80 determines pulse wave velocity at each measurement position based on a phase difference between the waveform of the electrocardiographic signal of the electrocardiograph 40 and a detection signal waveform obtained from the light-receiving parts 34 and 36, and derives the condition of the displacement of the wall of the blood vessel 12 from the pulse wave velocity.
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Citations
12 Claims
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1. A blood vessel characteristics measuring apparatus, comprising:
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a sensor unit provided at a position opposed to a measurement region of a subject, the sensor unit including a light-emitting part configured to emit light onto the measurement region and a light-receiving part configured to contactlessly receive the light propagated through the measurement region; a blood flow measuring part configured to measure a displacement of a blood vessel and a displacement of a tissue around the blood vessel caused by a blood flow in the measurement region based on a light intensity at a time of receiving the light emitted from the light-emitting part in the light-receiving part; a blood vessel displacement deriving part configured to derive a displacement of a wall of the blood vessel based on the displacement of the blood vessel and the displacement of the tissue around the blood vessel obtained by the blood flow measuring part; an electrocardiographic measurement part configured to measure an electrocardiographic signal of the subject; and a blood vessel condition deriving part configured to derive a condition of the wall of the blood vessel at each of measurement positions based on a difference between a waveform of the electrocardiographic signal and a detection signal waveform obtained from the light-receiving part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A blood vessel characteristics measuring method, comprising:
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causing a light-emitting part of a sensor unit provided to be opposed to a measurement region of a subject to emit light onto the measurement region and receiving the light propagated through the measurement region in a light-receiving part of the sensor; measuring a displacement of a blood vessel and a displacement of a tissue around the blood vessel caused by a blood flow in the measurement region based on a detection signal of a light intensity at a time of receiving the light emitted from the light-emitting part in the light-receiving part; deriving a displacement of a wall of the blood vessel based on the displacement of the blood vessel and the displacement of the tissue around the blood vessel; measuring an electrocardiographic signal of the subject; and deriving a condition of the wall of the blood vessel at each of measurement positions based on a difference between a waveform of the electrocardiographic signal and a detection signal waveform obtained from the light-receiving part.
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Specification