Stereo pulse oximeter
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Abstract
An improved pulse oximeter provides for simultaneous, noninvasive oxygen status and photoplethysmograph measurements at both single and multiple sites. In particular, this multiple-site, multiple-parameter pulse oximeter, or “stereo pulse oximeter” simultaneously measures both arterial and venous oxygen saturation at any specific site and generates a corresponding plethysmograph waveform. A corresponding computation of arterial minus venous oxygen saturation is particularly advantageous for oxygen therapy management. An active pulse-inducing mechanism having a scattering-limited drive generates a consistent pulsatile venous signal utilized for the venous blood measurements. The stereo pulse oximeter also measures arterial oxygen saturation and plethysmograph shape parameters across multiple sites. A corresponding calculation of delta arterial saturation and comparison of plethysmograph shape parameters between multiple sites is particularly advantageous for the detection and management of persistent pulmonary hypertension in neonates (PPHN), a patent ductus arteriosis (PDA), and aortic coarctation.
130 Citations
28 Claims
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1-27. -27. (canceled)
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28. A physiological monitor sensor, comprising:
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a plurality of emitters and a plurality of detectors, at least one of said plurality of emitters and at least one of said plurality of detectors being associated with one of a plurality of peripheral tissue sites and another of said plurality of emitters and another of said plurality of detectors being associated with another tissue site different from said one of a plurality of tissue sites, wherein light transmitted from said emitter through a corresponding one of said plurality of tissue sites is measured by a corresponding detector, and a signal indicative of said measured light is communicated to at least one of a plurality of sensor interfaces that is in communication with a processor having an output comprising a plurality of parameters corresponding to oxygen status or plethysmograph features of said peripheral tissue sites;
a connector in communication with said sensor interfaces; and
a plurality of signal paths attached between at least one of said plurality of emitters and detectors at a first end and said connector at a second end.
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Specification