Optics: measuring and testing – Blood analysis
Reexamination Certificate
2007-10-15
2008-09-02
Punnoose, Roy M (Department: 2886)
Optics: measuring and testing
Blood analysis
Reexamination Certificate
active
07420660
ABSTRACT:
Systems and methods for optically sensing characteristics of a blood flow provide a light source having a driver circuit that includes a source of constant current and a modulator that modulates the constant current at a selected carrier frequency for transmission to the light source. The systems and methods also include a light sensor for receiving light from the light source and producing a modulated output proportional to received light intensity. A receiver circuit including a bandpass filter is coupled to the light sensor to receive the modulated output and having a center frequency at or near the selected carrier frequency to eliminate frequency components above and below the selected carrier frequency.
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Cook Alex McFarron Manzo Cummings & Mehler, Ltd.
Fenwal, Inc.
Punnoose Roy M
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