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US20080287815 Photoplethysmography apparatus and method employing high resolution estimation of time-frequency spectra  
A photoplethysmography apparatus and method is provided for high resolution estimating of Time-Frequency Spectra (TFS) and associated amplitudes using Variable Frequency Complex Demodulation...
US20080188760 PLETHYSMOGRAPH VARIABILITY PROCESSOR  
A plethysmograph variability processor inputs a plethysmograph waveform having pulses corresponding to pulsatile blood flow within a tissue site. The processor derives plethysmograph values based...
US20080077024 Measuring Blood Flow and Venous Capacitance  
Non-invasively measuring a physiological parameter by applying to a subject's body part a venous occlusion plethysmographic device including a first section having a first fluid chamber and at...
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