Blood pressure measuring apparatus
First Claim
1. A blood pressure measuring apparatus comprising:
- oppressing means for oppressing blood vessels of a human body;
oppressing pressure detecting means for detecting the oppressing pressure value on the blood vessels by the oppressing means;
similar waveform detecting means for detecting similar waveforms changing similarly to pressure changes in the blood vessels oppressed by the oppressing means in one heartbeat period; and
blood pressure calculating means for determining the scale of the similar waveforms detected by the similar waveform detecting means, and calculating the blood pressure by matching the determined scale of similar waveforms with the scale of waveforms showing pressure changes in the blood vessels, wherein the blood pressure calculating means includes;
level detecting means for detecting the level of the similar waveforms in one heartbeat period; and
means for determining the scale of the similar waveforms on the basis of the similarity ratio indicated by the ratio of the difference of levels at two moments of maximum level and minimum level detected by the level detecting means and the difference of the oppressing pressure values detected by the oppressing pressure detecting means corresponding to the two moments, and matching the determined scale of similar waveforms with the scale of the waveforms showing pressure changes in the blood vessels.
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Accused Products
Abstract
A blood pressure measuring apparatus oppresses blood vessels of a human body by an inflating unit through a cuff. When the blood vessels are oppressed through the cuff, a pulse wave superposed on a cuff pressure signal through a cuff pressure detector is detected by a pulse wave detector. The waveform of the detected pulse wave changes similarly to changes of pressure in the oppressed blood vessels in one heartbeat period. The information of the detected pulse wave waveform and the cuff pressure at this time are stored in a memory. A blood pressure calculator determines the scale of pulse wave waveform on the basis of the information stored in the memory, and matches the determined scale of pulse wave waveform with the scale of waveform showing pressure changes in the blood vessels, so that a plurality of timings of coincidence of cuff pressure and blood pressure are detected, and the systolic pressure and diastolic pressure are calculated by using these detected information and stored information of pulse wave waveforms. It is therefore possible to measure blood pressures in a short time.
20 Citations
15 Claims
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1. A blood pressure measuring apparatus comprising:
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oppressing means for oppressing blood vessels of a human body;
oppressing pressure detecting means for detecting the oppressing pressure value on the blood vessels by the oppressing means;
similar waveform detecting means for detecting similar waveforms changing similarly to pressure changes in the blood vessels oppressed by the oppressing means in one heartbeat period; and
blood pressure calculating means for determining the scale of the similar waveforms detected by the similar waveform detecting means, and calculating the blood pressure by matching the determined scale of similar waveforms with the scale of waveforms showing pressure changes in the blood vessels, wherein the blood pressure calculating means includes;
level detecting means for detecting the level of the similar waveforms in one heartbeat period; and
means for determining the scale of the similar waveforms on the basis of the similarity ratio indicated by the ratio of the difference of levels at two moments of maximum level and minimum level detected by the level detecting means and the difference of the oppressing pressure values detected by the oppressing pressure detecting means corresponding to the two moments, and matching the determined scale of similar waveforms with the scale of the waveforms showing pressure changes in the blood vessels. - View Dependent Claims (2, 3, 4, 5, 12, 13, 14, 15)
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6. A blood pressure measuring apparatus comprising:
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oppressing means for oppressing blood vessels of a human body;
similar waveform detecting means for detecting similar waveforms changing similarly to pressure changes in the blood vessels oppressed by the oppressing means in one heartbeat period; and
blood pressure calculating means for determining the scale of the similar waveforms detected by the similar waveform detecting means, and calculating the blood pressure by matching the determined scale of similar waveforms with the scale of waveforms showing pressure changes in the blood vessels, wherein the similar waveform detecting means includes pulse wave detecting means for detecting the waveform of pulse waves derived from pulsation components of volume changes of the blood pressure caused by oppression by the oppressing means as the similar waveforms, and the blood pressure calculating means includes;
storing means for storing, in the one heartbeat period, the levels of waveforms of first, second and third pulse waves detected by the pulse wave detecting means by first oppressing pressure not closing the blood vessels by the oppressing means, and second oppressing pressure and third oppressing pressure for closing the blood vessels;
level specifying means for specifying the second and third level corresponding to the starting moments of closure of the waveforms of the second and third pulse waves, of the waveform of the first pulse wave matched in time phase with the waveforms of the second and third pulse waves, in the contents stored in the storing means; and
processing means for determining the scale of the similar waveforms on the basis of the difference of the second level and third level specified by the level specifying means, and the similarity ratio indicated by the ratio of the difference of the second oppressing pressure and third oppressing pressure, and matching the determined scale of the similar waves with the scale of the waveform indicating the pressure changes in the blood vessels. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification