BODY-WORN PULSE OXIMETER
First Claim
1. A method for determining an oxygen saturation value from a patient, comprising the following steps:
- (a) measuring a first time-dependent signal by detecting radiation emitted by a first radiation source after it passes through a portion of the patient;
(b) measuring a second time-dependent signal by detecting radiation emitted by a second radiation source after it passes through a portion of the patient;
(c) measuring a time-dependent motion signal with at least one motion sensor;
(d) measuring a time-dependent electrical signal with an electrical sensor comprising at least two electrodes;
(e) processing the time-dependent electrical signal to determine at least one reference point;
(f) processing the time-dependent motion signal to determine a motion-related event that affects at least one of the first and second time-dependent signals;
(g) processing both the first and second time-dependent signals from the reference point and outside of the motion-related event to determine time-dependent signals; and
(h) processing the time-dependent signals to determine a value of oxygen saturation.
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Accused Products
Abstract
The invention provides a body-worn system that continuously measures pulse oximetry and blood pressure, along with motion, posture, and activity level, from an ambulatory patient. The system features an oximetry probe that comfortably clips to the base of the patient'"'"'s thumb, thereby freeing up their fingers for conventional activities in a hospital, such as reading and eating. The probe secures to the thumb and measures time-dependent signals corresponding to LEDs operating near 660 and 905 nm. Analog versions of these signals pass through a low-profile cable to a wrist-worn transceiver that encloses a processing unit. Also within the wrist-worn transceiver is an accelerometer, a wireless system that sends information through a network to a remote receiver, e.g. a computer located in a central nursing station.
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Citations
22 Claims
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1. A method for determining an oxygen saturation value from a patient, comprising the following steps:
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(a) measuring a first time-dependent signal by detecting radiation emitted by a first radiation source after it passes through a portion of the patient; (b) measuring a second time-dependent signal by detecting radiation emitted by a second radiation source after it passes through a portion of the patient; (c) measuring a time-dependent motion signal with at least one motion sensor; (d) measuring a time-dependent electrical signal with an electrical sensor comprising at least two electrodes; (e) processing the time-dependent electrical signal to determine at least one reference point; (f) processing the time-dependent motion signal to determine a motion-related event that affects at least one of the first and second time-dependent signals; (g) processing both the first and second time-dependent signals from the reference point and outside of the motion-related event to determine time-dependent signals; and (h) processing the time-dependent signals to determine a value of oxygen saturation. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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2. A method for determining both oxygen saturation and blood pressure values for a patient, comprising:
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(a) measuring at least one optical signal with a first sensor; (b) measuring an electrical signal comprising a time-dependent marker with a second sensor; (c) measuring a motion signal with a motion sensor; (d) processing both the motion and optical signals from the time-dependent marker to a later point in time to determine AC signals and a transit time; and (e) determining a blood pressure value from the transit time, and an oxygen saturation value from the AC signals.
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Specification