Method and apparatus for blood pressure measurement including a true Korotkov sound detector
First Claim
1. A method for determining the presence of true Korotkov sounds for use in a blood pressure measurement system comprising the steps of:
- detecting sequentially occurring heart pulse signals and Korotkov sounds emitted from a body,determining when any detected heart pulse signal occurs in time synchronism with a detected Korotkov sound,examining four successively detected heart pulse signals and any associated time synchronized detected Korotkov sounds to determine whether three or four Korotkov sounds were time synchronized with said four detected heart pulse signals, anddetermining that each of the Korotkov sound signals associated with said four detected heart pulse signals is a true Korotkov sound signal when three or four time synchronized Korotkov sound signals are found in said examination.
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Abstract
Indirect blood pressure measurement for a systolic or diastolic blood pressure is accomplished by making use of a true Korotkov sound determination. When three or four Korotkov sound signals are found in four successive heart pulses of a body, each of the three or four Korotkov sound signals is determined as a true Korotkov sound signal. A cuff pressure existing when the first true Korotkov sound appears is determined as a systolic blood pressure. Another cuff pressure existing when the last true Korotkov sound signal appears is determined as a diastolic blood pressure. The last true Korotkov sound signal is determined by counting three heart pulses unaccompanied by no Korotkov sound signals following the detection of the last true Korotkov sound appearance.
23 Citations
14 Claims
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1. A method for determining the presence of true Korotkov sounds for use in a blood pressure measurement system comprising the steps of:
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detecting sequentially occurring heart pulse signals and Korotkov sounds emitted from a body, determining when any detected heart pulse signal occurs in time synchronism with a detected Korotkov sound, examining four successively detected heart pulse signals and any associated time synchronized detected Korotkov sounds to determine whether three or four Korotkov sounds were time synchronized with said four detected heart pulse signals, and determining that each of the Korotkov sound signals associated with said four detected heart pulse signals is a true Korotkov sound signal when three or four time synchronized Korotkov sound signals are found in said examination. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for determining the presence of true Korotkov sounds for use in a blood pressure measurement system comprising:
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an inflatable blood pressure cuff, means associated with said cuff for detecting the successive emission of Korotkov sounds from a body and for providing a "1" signal when a Korotkov sound signal is detected and a "0" when no Korotkov sound signal is detected, means associated with said cuff for detecting the successive emission of heart pulse signals from a body and for providing a pulse signal when said heart pulse signals occur, a four stage shift register means for serially receiving at an input thereof the output from said means for detecting Korotkov sound signals, said register means being responsive to said pulse signal to shift the contents thereof, and means for examining said four steps of said shift register and for determining that each "1" signal in said examined four stages represents the occurrence of a true Korotkov sound when either three or four "1" signals are contained in said four stages. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification