Surgery – Diagnostic testing – Via monitoring a plurality of physiological data – e.g.,...
Reexamination Certificate
2002-09-19
2004-08-10
Jones, Mary Beth (Department: 3736)
Surgery
Diagnostic testing
Via monitoring a plurality of physiological data, e.g.,...
C600S323000, C600S481000, C600S529000
Reexamination Certificate
active
06773397
ABSTRACT:
TECHNICAL FIELD
The present invention relates to medical systems and in particular to systems for monitoring physiological parameters.
BACKGROUND
Patient treatment often includes monitoring of various physiological parameters. Conventionally, such monitoring begins by attaching sensors to several locations on a patient's body. The sensors transmit signals to one or more devices, which in turn determine the values of subject parameters based on the signals. In this regard, a particular parameter value may be determined based on a signal received from one or more of the attached sensors.
Many methods have been employed to determine parameter values based on sensed physiological signals. According to some of these methods, a beat detector detects a beat that is present in a signal associated with a particular parameter. The detected beat is then used to determine a value of the particular parameter. For example, conventional algorithms may be used to compute a maximum pressure or peak of an electrocardiogram (EKG) from a detected beat. Values of other physiological parameters may be determined based on beats that are present in signals associated with the other parameters. These parameters include non-invasive blood pressure (NIBP), invasive blood pressure (IBP), and blood oxygen saturation level (SPO2).
Conventional beat detectors operate best when signals corresponding to associated physiological parameters are free of noise. These beat detectors therefore have difficulty in properly identifying beats in the presence of environmental noise and/or patient movement. As a result, any parameter values determined based on the identified beats suffer from inaccuracies.
Some systems attempt to address the foregoing by gating a beat associated with one parameter using a beat associated with another parameter, or by using a beat detected for one parameter to filter a beat associated with another parameter. The unidirectional processing of these systems does not lend itself to accuracy or flexibility. Moreover, the algorithms used for gating and filtering reflect a wide margin of error due to variations in physiology among patients. Consequently, these systems do not provide satisfactory accuracy and reliability.
A system is therefore desired to improve the determination of pulsation-based parameter values that satisfactorily addresses signal noise induced by motion or other environmental sources.
SUMMARY
To address at least the foregoing, some aspects of the present invention provide a system, method, apparatus, and means to determine a value of a physiological parameter. A system detects a pulsation associated with a physiological parameter. The system includes an input device for receiving a plurality of different signals, each of the plurality of different signals indicating a pulsation in respective different physiological parameters. A signal processor detects and accumulates information from the plurality of different signals. The accumulated information including values of relative delay between the pulsation in the respective different parameters. A timing processor determines a timing of the pulsation in at least one of the different parameters based at least on the accumulated information. The physiological parameters include parameters associated with at least two of, non-invasive blood pressure, invasive blood pressure, heart beat, blood oxygen saturation level, respiration rate, an ECG and temperature.
The present invention is not limited to the disclosed embodiments, however, as those of ordinary skill in the art can readily adapt the teachings of the present invention to create other embodiments and applications.
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International Search Report.
Draeger Medical Systems Inc.
Jack Schwartz & Associates
Jones Mary Beth
Mallari Patricia C.
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