Non-invasively monitoring blood parameters
First Claim
1. A system comprising:
- a processor;
a sensor in communication with the processor, including;
at least one light source; and
at least one photodetector;
a display in communication with the processor;
an alarm in communication with the processor; and
a memory storing instructions executable by the processor for activating the alarm when a sensor response meets at least one predefined criterion;
the memory further storing instructions for periodically acquiring sensor responses, sampling the sensor responses at a sampling frequency to develop a waveform, developing a reference envelope having a lower limit band and an upper limit band wherein a proximity of the envelope to the waveform is based at least in part on the sampling frequency, and storing the envelope in the memory; and
wherein the at least one predefined criterion includes the photodetector response crossing the upper or lower limit of the envelope.
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Accused Products
Abstract
An apparatus for monitoring vital sign parameters in a biological entity is disclosed. In an embodiment, the apparatus includes at least one light source for transmitting light through the biological entity and at least one photodetector for receiving light transmitted through the biological entity. At least one light source and at least one photodetector are configured to be positioned proximate the biological entity in a manner that does not significantly impede blood flow through the biological entity. A signal is generated in response to the transmittance or reflectance of light through the biological entity. The signal corresponds to at least one characteristic of the generally unimpeded blood flow through the biological entity. The apparatus also includes a control system configured to analyze the signal to determine vital sign parameters in the biological entity. A method for monitoring vital sign parameters in a biological entity is also provided.
22 Citations
18 Claims
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1. A system comprising:
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a processor; a sensor in communication with the processor, including; at least one light source; and at least one photodetector; a display in communication with the processor; an alarm in communication with the processor; and a memory storing instructions executable by the processor for activating the alarm when a sensor response meets at least one predefined criterion; the memory further storing instructions for periodically acquiring sensor responses, sampling the sensor responses at a sampling frequency to develop a waveform, developing a reference envelope having a lower limit band and an upper limit band wherein a proximity of the envelope to the waveform is based at least in part on the sampling frequency, and storing the envelope in the memory; and wherein the at least one predefined criterion includes the photodetector response crossing the upper or lower limit of the envelope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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activating a light source that is included in a sensor positioned proximate a biological entity; activating a photodetector that is included in the sensor; acquiring a pulse waveform signal from the photodetector corresponding to a blood flow characteristic of the biological entity; sampling the pulse waveform signal to obtain a second sampled signal; identifying a peak value of the second sampled signal; developing a reference envelope with a lower limit band and an upper limit band based at least in part on the peak value and a user input, and activating an alarm when an incoming signal from the photodetector crosses the upper or lower limit of the envelope. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification