Pulse oximeter with motion detection
First Claim
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1. A method of analyzing pulse oximetry measurements made on a patient, comprising:
- taking pulse oximetry measurements of the patient at a measurement site with a first device;
detecting motion of at least a part of the patient with a second device separate from the first device; and
analyzing pulse oximetry measurements taken at times selected according to the detected motion of the at least part of the patient, wherein detecting the motion of at least a part of a patient includes receiving motion signals from at least two different parts of the patient.
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Abstract
There is a need for a technique to compensate for, or eliminate, motion-induced artifacts in patient-attached critical care monitoring instruments. Consequently, the invention is directed to improving pulse-oximetry by incorporating additional signals to aid in the triggering of the pulse-oximeter or in analyzing the data received by the pulse oximeter. This includes detecting when the patient moves and analyzing the pulse-oximetry data in light of the detected movement.
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Citations
29 Claims
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1. A method of analyzing pulse oximetry measurements made on a patient, comprising:
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taking pulse oximetry measurements of the patient at a measurement site with a first device;
detecting motion of at least a part of the patient with a second device separate from the first device; and
analyzing pulse oximetry measurements taken at times selected according to the detected motion of the at least part of the patient, wherein detecting the motion of at least a part of a patient includes receiving motion signals from at least two different parts of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of analyzing pulse oximetry measurements made on a patient, comprising:
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taking pulse oximetry measurements of the patient at a measurement site with a first device;
detecting motion of at least a part of the patient with a second device separate from the first device; and
analyzing pulse oximetry measurements taken at times selected according to the detected motion of the at least part of the patient, wherein taking pulse oximetry measurements includes taking pulse oximetry measurements on a patient'"'"'s digit and detecting motion of at least a part of the patient includes receiving motion signals from the digit and the limb to which the digit is attached.
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12. An apparatus for measuring oxygen saturation of hemoglobin at a measurement site on a patient, comprising:
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a controller having;
a motion detector unit for receiving an input signal related to motion of at least a part of the patient; and
an oxygen saturation unit for receiving signals related to measurements of oxygen saturation of hemoglobin made at the measurement site;
a sensor head attachable to the patient at the measurement site for making hemoglobin oxygen saturation measurements, the sensor head being coupled to the oxygen saturation unit; and
a sensor coupled to the motion detector unit, the sensor being separate from the sensor head, so as to permit motion sensing of a portion of the patient different from the measurement site;
wherein the controller analyzes signals related to measurements of oxygen saturation made at times selected based on the input signal related to the motion of the at least part of the patient; and
wherein the sensor head includes an additional sensor to detect motion, the additional sensor being coupled to the motion detector unit. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of analyzing pulse oximetry measurements made on a patient, comprising:
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taking pulse oximetry measurements of the patient at a measurement site using a pulse-oximetry sensor head; and
detecting motion of the pulse-oximetry sensor head relative to the measurement site;
wherein the pulse-oximetry sensor head remains attached to the patient after moving relative to the measurement site; and
wherein detecting motion of the pulse-oximetry head includes detecting motion of the sensor head and detecting motion of a portion of the patient proximate the sensor head and determining that the pulse-oximetry head has moved relative to the measurement site based on a difference between the detected motion of the sensor head and the detected motion of the portion of the patient. - View Dependent Claims (19, 20, 21, 22)
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23. A method of analyzing pulse oximetry measurements made on a patient, comprising:
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taking pulse oximetry measurements of the patient at a measurement site using a pulse-oximetry sensor head;
detecting motion of the pulse-oximetry sensor head relative to the measurement site;
generating a relative motion signal after detecting the motion of the sensor head relative to the measurement site; and
analyzing pulse-oximetry measurement data in resgonse to the relative motion signal;
wherein analyzing the pulse-oximetry measurement data includes ensemble averaging data taken only after a time associated with the motion of the sensor head relative to the measurement site.
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24. A system for measuring oxygen saturation of hemoglobin at a measurement site on a patient, comprising:
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a controller having an oxygen saturation unit having a first input to receive signals from a pulse-oximeter sensor head, a first motion detector analyzer having a first input to receive an input signal related to motion of at least a part of the patient; and
a second motion detector analyzer having a second input to receive an input signal related to motion of the sensor head. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification