WAVELENGTH SWITCHING FOR PULSE OXIMETRY
First Claim
1. A sensor comprising:
- a first emitter having a wavelength adapted to substantially optimize physiologic measurements in patients having high oxygen saturation levels; and
a second emitter having a wavelength adapted to substantially optimize physiologic measurements in patients having low oxygen saturation levels;
the first emitter and the second emitter being capable of being alternatively activated to substantially optimize physiologic measurements in patients having oxygen saturation levels in a transition region between the high oxygen saturation levels and the low oxygen saturation levels.
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Accused Products
Abstract
The present disclosure describes techniques that may provide more accurate estimates of arterial oxygen saturation using pulse oximetry by switching between a wavelength spectrum of at least a first and a second light source so that the arterial oxygen saturation estimates at low (e.g., in the range below 75%), medium (e.g., greater than or equal to 75% and less than or equal to 84%), and high (e.g., greater than 84% range) arterial oxygen saturation values are more accurately calculated. In one embodiment, light emitted from a near 660 nm and a near 900 nm emitter pair may be used when the arterial oxygen saturation range is high. In another embodiment, light emitted from a near 730 nm and a near 900 nm emitter pair may be used when the arterial oxygen saturation range is low. In yet another embodiment, light emitted from both a near 660 nm-900 nm emitter pair and light emitted from a near 730 nm-900 nm emitter pair may be used when the arterial oxygen saturation range is in the middle range. Priming techniques may also be used to reduce or eliminate start up delays of certain oximetry system components.
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Citations
23 Claims
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1. A sensor comprising:
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a first emitter having a wavelength adapted to substantially optimize physiologic measurements in patients having high oxygen saturation levels; and a second emitter having a wavelength adapted to substantially optimize physiologic measurements in patients having low oxygen saturation levels; the first emitter and the second emitter being capable of being alternatively activated to substantially optimize physiologic measurements in patients having oxygen saturation levels in a transition region between the high oxygen saturation levels and the low oxygen saturation levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of sensing physiologic parameters of a patient, the method comprising:
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if the patient'"'"'s arterial oxygen saturation level is in a high range, driving only a first set of emitters on a sensor adapted to substantially optimize physiologic measurements in patients having high arterial oxygen saturation levels; if the patient'"'"'s arterial oxygen saturation level is in a low range, driving only a second set of emitters on the sensor adapted to substantially optimize physiologic measurements in patients having low arterial oxygen saturation levels; and if the patient'"'"'s arterial oxygen saturation level is in a transition range between the high range and the low range, driving the first and second sets of emitters on the sensor. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A system, comprising:
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a monitor; and a sensor comprising; a first emitter having a wavelength adapted to substantially optimize physiologic measurements in patients having high arterial oxygen saturation levels; and a second emitter having a wavelength adapted to substantially optimize physiologic measurements in patients having low arterial oxygen saturation levels; the first emitter and the second emitter being capable of being alternatively driven by the monitor to substantially optimize physiologic measurements in patients having arterial oxygen saturation levels in a transition region between the high arterial oxygen saturation levels and the low arterial oxygen saturation levels. - View Dependent Claims (21, 22, 23)
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Specification