Motion compatible sensor for non-invasive optical blood analysis
First Claim
1. A system for determining an arterial blood constituent of a patient, comprising:
- a processing device in communication with a detector to process a detector signal from said detector representing a noncardiac produced blood pulse for determination of said blood constituent.
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Abstract
A non-invasive optical sensor which uses the motion signal to calculate the physiological characteristic being measured. For pulse oximetry, a least squares or a ratio-of-ratios technique can be applied to the motion signal itself. This is made possible by selecting a site on the patient where variations in motion produce signals of two wavelengths which are sufficiently correlated. In particular, it has been determined that a sensor placed on a nail, in particular a thumbnail, exhibits the characteristics of having the and infrared signals correlated when used for pulse oximetry, and the resulting signals correlate to arterial oxygen saturation.
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Citations
63 Claims
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1. A system for determining an arterial blood constituent of a patient, comprising:
a processing device in communication with a detector to process a detector signal from said detector representing a noncardiac produced blood pulse for determination of said blood constituent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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18. A reflectance optical sensor comprising:
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a sensor body configured to attach to a patient'"'"'s digit over a nail;
a radiation emitter mounted in said sensor body adjacent said nail; and
a radiation detector mounted in said sensor body spaced from said emitter and adjacent said nail.
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40. An optical sensor comprising:
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a sensor configured to attach to a patient;
an emitter connected to said sensor;
a detector connected to said sensor and spaced from said emitter to detect reflectance signals; and
at least one optical element connected to said sensor to facilitate transmittance signals. - View Dependent Claims (41, 42)
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43. A photometric device for processing detector signals representative of a blood property of a patient from a sensor attached to said patient, said sensor including a radiation emitter and a radiation detector, said monitor comprising:
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a control unit configured to generate an activation signal to selectively activate said emitter; and
a processing unit configured to receive said detector signals and to process said detector signals utilizing at least two points on a detector signal waveform produced by motion of said patient for measurement of said blood property.
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44. A photometric processing device for processing detector signals from a radiation detector in a patient sensor also having a radiation emitter, comprising:
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a first processing unit configured to determine a blood parameter from a cardiac derived plethysmogram from said detector;
a second processing unit configured to determine said blood parameter from a motion artifact waveform from said detector; and
a control unit configured to utilize said first and second processing units responsive to a motion artifact content of said detector signals. - View Dependent Claims (45, 47, 48, 49, 50, 51, 52, 53)
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46. A photometric processing device for processing detector signals from a detector in a patient sensor having an emitter and a detector, comprising:
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a stimulator configured to generate an artificial pulse in said patient, said artificial pulse being distinct from a cardiac derived arterial pulse; and
a processing unit configured to determine a physiological parameter of arterial blood from a signal from said detector representative of said artificial pulse.
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54. A photometric processing device for processing detector signals from a detector in at least one patient sensor having an emitter and a detector, comprising:
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a selector configured to select between a reflectance signal and a transmittance signal from said at least one sensor; and
a processing unit configured to determine a physiological parameter from a plethysmogram from said at least one sensor. - View Dependent Claims (55, 56, 58, 59, 60, 61)
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57. A method of measuring arterial oxygen saturation, comprising the steps of:
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selecting a site on a patient wherein detected light signals from at least two wavelengths are sufficiently correlated in the presence of motion;
placing a pulse oximeter sensor on said site; and
measuring arterial oxygen saturation using said sensor.
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62. A method for measuring a property of blood, comprising the steps of:
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selecting a site on a patient wherein propagated light of at least two wavelengths will have sufficiently correlated waveforms in the presence of non-cardiac pulses;
placing a light emitter and light detector on said site; and
using signals derived from said light detector to measure said blood property. - View Dependent Claims (63)
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Specification