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US 4,058,117 AGranted
Blood pressure measuring apparatus
AssigneePalo Alto Research Associates
InventorsWilliam J. Kaspari, Herman Wong, Joseph L. Kirch
Life of this patent
Estimating the term…
Abstract
A fully automatic, non-invasive, digitally-controlled blood pressure measuring apparatus is described with LED displays for displaying systolic and diastolic blood pressure levels, an inflatable cuff for occluding an artery, a pump for inflating the cuff, a cuff-mounted sensor for detecting Korotkoff sounds, adjustable gain-amplifying apparatus for maintaining linearity of the Korotkoff sound levels over a wide range of human individuals, circuits for automatically determining systolic and diastolic pressure levels and pressure release apparatus for preventing overinflation of the cuff.
Claims6
A blood pressure measuring apparatus comprising:
- an inflatable cuff adapted to occlude an artery when inflated;
- means for inflating said cuff means from a cuff condition of non-inflation to a cuff pressure sufficient to occlude an artery without interruption;
- means mounted in said cuff means for detecting sounds created when said cuff means occludes an artery;
- means coupled to said detecting means for amplifying said sounds;
- means responsive to said amplifying means during said inflation of said cuff means for automatically reducing the gain of said amplifying means when said sounds exceed a predetermined amplitude during said uninterrupted inflating of said cuff means, said gain-reducing means comprising means for reducing said gain of said amplifying means only when said cuff means has been inflated to at least a first predetermined pressure;
- means responsive to a cessation of said sounds for a predetermined period during said uninterrupted inflating of said cuff means for automatically stopping said inflating of said cuff means;
- means for deflating said cuff means automatically after said stopping of said inflating of said cuff means;
- means for detecting the first sound having a predetermined amplitude following the initiation of said deflating of said cuff means;
- means responsive to said detecting of said first sound for displaying a first cuff pressure, as a measure of systolic blood pressure in said artery;
- and
- means responsive to subsequent sounds during continued deflating of said cuff means for automatically displaying a second cuff pressure as a measure of diastolic blood pressure when a first one of said subsequent sounds has an amplitude which is less than a predetermined amplitude.
8 more elements
A blood measuring apparatus comprising:
- an inflatable cuff means adapted to occlude an artery when inflated;
- means for inflating said cuff means from a cuff condition of non-inflation to a cuff pressure sufficient to occlude an artery without interruption;
- means mounted in said cuff means for detecting sounds created when said cuff means occludes an artery;
- means coupled to said detecting means for amplifying said sounds;
- means responsive to said amplifying means during said inflation of said cuff means for automatically reducing the gain of said amplifying means when said sounds exceed a predetermined amplitude during said uninterrupted inflating of said cuff means;
- means responsive to a cessation of said sounds for a predetermined period during said uninterrupted inflating of said cuff means for automatically stopping said inflating of said cuff means;
- means for deflating said cuff means automatically after said stopping of said inflating of said cuff means;
- means for detecting the first sound having a predetermined amplitude following the initiation of said deflating of said cuff means;
- means responsive to said detecting of said first sound for displaying a first cuff pressure, as a measure of systolic blood pressure in said artery;
- means responsive to subsequent sounds during continued deflating of said cuff means for automatically displaying a second cuff pressure as a measure of diastolic blood pressure when a first one of said subsequent sounds has an amplitude which is less than a predetermined amplitude;
- and
- means for suspending said cuff means from a shoulder, said suspending means including a shoulder strap means a chest plate, and means for mounting said cuff means to said strap means and plate for holding said cuff means mounted sound detecting means in a predetermined position relative to the source of said sounds.
9 more elements
Dependencies are inferred from the claim text.