BLOOD PRESSURE MANOMETER AND A METHOD OF CALCULATING INDICES OF ATHEROSCLEROSIS USING THE BLOOD PRESSURE MANOMETER
First Claim
1. A device for measuring blood pressure and calculating an index of degree of arteriosclerosis of a patient, the device comprising:
- a cuff for wrapping around a measurement location of a patient, the cuff containing an air bladder;
an air pressure adjustor that adjusts an internal pressure of the air bladder;
a pressure sensor that detects changes of the internal pressure of the air bladder; and
a computation device that obtains a blood pressure waveform based on the changes of internal pressure of the air bladder detected by the pressure sensor, separates and identifies an ejection wave component and a reflected wave component from the blood pressure waveform, and calculates an index of degree of arteriosclerosis of the patient, the computation device further comprising;
a threshold value setting portion that sets a threshold value based on an index that expresses a characteristic of the blood pressure waveform with respect to a point of appearance of the reflected wave in the blood pressure waveform; and
a rise point estimating portion that estimates a rise point of the reflected wave by calculating an x-coordinate value of a point based on a maximum amplitude of the reflected wave and the threshold value,wherein the index of degree of arteriosclerosis is obtained by calculating a time difference in appearance between the ejection wave and the reflected wave based on the estimated rise point of the reflected wave.
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Accused Products
Abstract
A blood pressure measurement device accurately calculates an index useful in determining the degree of arteriosclerosis by accurately detecting a difference in time of appearance of a ejection wave and reflected wave in a blood pressure waveform. The device sets a threshold value based on an index that expresses a characteristic of the blood pressure waveform with respect to the point of appearance of the reflected wave in the blood pressure and estimates a rise point of the reflected wave by calculating an x-coordinate value of a point based on a maximum amplitude of the reflected wave and the threshold value. The device obtains the index of degree of arteriosclerosis by calculating a time difference in appearance between the ejection wave and the reflected wave based on the estimated rise point of the reflected wave.
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Citations
15 Claims
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1. A device for measuring blood pressure and calculating an index of degree of arteriosclerosis of a patient, the device comprising:
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a cuff for wrapping around a measurement location of a patient, the cuff containing an air bladder; an air pressure adjustor that adjusts an internal pressure of the air bladder; a pressure sensor that detects changes of the internal pressure of the air bladder; and a computation device that obtains a blood pressure waveform based on the changes of internal pressure of the air bladder detected by the pressure sensor, separates and identifies an ejection wave component and a reflected wave component from the blood pressure waveform, and calculates an index of degree of arteriosclerosis of the patient, the computation device further comprising; a threshold value setting portion that sets a threshold value based on an index that expresses a characteristic of the blood pressure waveform with respect to a point of appearance of the reflected wave in the blood pressure waveform; and a rise point estimating portion that estimates a rise point of the reflected wave by calculating an x-coordinate value of a point based on a maximum amplitude of the reflected wave and the threshold value, wherein the index of degree of arteriosclerosis is obtained by calculating a time difference in appearance between the ejection wave and the reflected wave based on the estimated rise point of the reflected wave. - View Dependent Claims (2, 3, 4, 5)
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6. A device for measuring blood pressure and calculating an index of degree of arteriosclerosis of a patient, the device comprising:
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means containing an air bladder for wrapping around a measurement location of a patient; means for adjusting an internal pressure of the air bladder; means for detecting changes of the internal pressure of the air bladder; and means for obtaining a blood pressure waveform based on the changes of internal pressure of the air bladder detected by the pressure sensor, separating and identifying an ejection wave component and a reflected wave component from the blood pressure waveform, and calculating an index of degree of arteriosclerosis of the patient, the means further comprising; means for setting a threshold value based on an index that expresses a characteristic of the blood pressure waveform with respect to a point of appearance of the reflected wave in the blood pressure waveform; and means for estimating a rise point of the reflected wave by calculating an x-coordinate value of a point based on a maximum amplitude of the reflected wave and the threshold value, wherein the index of degree of arteriosclerosis is obtained by calculating a time difference in appearance between the ejection wave and the reflected wave based on the estimated rise point of the reflected wave. - View Dependent Claims (7, 8, 9, 10)
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11. A method of calculating an index of degree of arteriosclerosis of a patient, the method comprising:
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obtaining a blood pressure waveform of the patient based on changes of internal pressure of an air bladder placed at a measurement location of the patient; separating and identifying an ejection wave component and a reflected wave component from the blood pressure waveform; setting a threshold value based on an index that expresses a characteristic of the blood pressure waveform with respect to a point of appearance of the reflected wave in the blood pressure waveform; estimating a rise point of the reflected wave by calculating an x-coordinate value of a point based on a maximum amplitude of the reflected wave and the threshold value; and obtaining the index of degree of arteriosclerosis by calculating a time difference in appearance between the ejection wave and the reflected wave based on the estimated rise point of the reflected wave. - View Dependent Claims (12, 13, 14, 15)
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Specification