Detection of blood pressure complexes in automated vital signs monitors
First Claim
Patent Images
1. An oscillometric blood pressure monitor comprising:
- (a) means for sensing arterial pressure pulsations;
(b) transducer means, responsive to said means for sensing, for producing signals representative of said pulsations;
(c) means, responsive to said transducer means, for filtering said signals to pass at least signals of a frequency band corresponding to oscillatory complexes;
(d) means for selectively clamping the output of said means for filtering to a predetermined baseline; and
(e) control means, responsive to the slope of said signals from said means for filtering, for enabling said means for clamping.
5 Assignments
0 Petitions
Accused Products
Abstract
A blood pressure cuff is applied to the patient, pumped to a pressure above systolic, and then is reduced in pressure decrements. At each decrement, complexes are detected by investigating the signal slope, and peaks of the complexes are measured and compared. During the complex detection process, the signal slope is measured periodically at a rapid rate, and unless the slope meets predetermined criteria, the input filters are clamped to a baseline, and the process is repeated.
56 Citations
7 Claims
-
1. An oscillometric blood pressure monitor comprising:
-
(a) means for sensing arterial pressure pulsations; (b) transducer means, responsive to said means for sensing, for producing signals representative of said pulsations; (c) means, responsive to said transducer means, for filtering said signals to pass at least signals of a frequency band corresponding to oscillatory complexes; (d) means for selectively clamping the output of said means for filtering to a predetermined baseline; and (e) control means, responsive to the slope of said signals from said means for filtering, for enabling said means for clamping. - View Dependent Claims (2, 3, 4, 5)
-
-
6. In an oscillometric blood pressure monitoring method of the type which processes arterial counterpressure oscillations into blood pressure data, an improved complex detection method comprising;
-
(a) periodically sensing the slope of counterpressure oscillations; (b) comparing said slope with a reference; and (c) blocking further processing of the counterpressure oscillations for a predetermined time unless said slope is greater than a predetermined reference.
-
-
7. In an oscillometric blood pressure monitor of the type including means for transducing signals representative of blood pressure pulsations in a subject, and filter means for isolating the pulsatile components in said signals, and providing output signals corresponding thereto, the improvement comprising apparatus for avoiding select artifact data comprising:
-
(a) a source of timing signals; (b) means, responsive to timing signals, for periodically evaluating the slope of signals from said filter means; (c) means for selectively clamping the output of said filter means to a predetermined baseline; and (d) means for enabling said means for clamping when said slope is less than a predetermined amount.
-
Specification