Abstract: A method and device for measuring nocturnal penile tumescence and rigidity. In a first embodiment, two circular elastic sensors of differing viscoelasticities, placed around a penis, sense changes in penile circumference, which describes penile tumescence. A comparison of the instantaneous circumferences of the two sensors describes penile rigidity. Sensor circumference is measured by monitoring changes in electrical resistance across the sensor. In a second embodiment, a single circular elastic sensor senses changes in penile circumference (describing tumescence), while rigidity is described by changes in amplitude of a plethysmographic signal sensed by the single circular sensor. In a third embodiment, a photoplethysmographic sensor senses a penile plethysmographic signal. The signal mean intensity describes penile tumescence, and changes in amplitude of the plethysmographic signal describe changes in cardiac outlook.

Abstract: A method and device for determining the depth of anesthesia. A pattern of very low frequency oscillations in measured skin temperature, or photoplethysmographic pulse pressure, is defined and analyzed. The frequency bandwidth of a frequency domain analysis of the oscillatory pattern, or the correlation between simultaneous oscillatory patterns measured at different physical locations, are used separately or fused to obtain an index of depth of anesthesia.