Abstract: A method comprising receiving a blood pressure waveform from a sensor and deriving initial values. The method may further comprise deriving a diastolic transit time (DTT) value and a plurality of additional properties from the waveform. The method may further comprise calculating a calibration factor based on the DTT values and the additional properties. The method may further comprise calculating estimated DBP values based on the calibration factor, the DTT values, and the additional properties. The method may further comprise deriving an offset value based on a difference between the estimated DBP values and the raw DBP values, adjusting the blood pressure waveform based on the offset to generate an adjusted blood pressure waveform, and outputting the adjusted blood pressure waveform.

Abstract: The present invention provides a method to convert any passive stethoscope into a wireless and tubeless stethoscope. A device is mounted onto an exit port on the stethoscope chest piece. The device transduces the acoustic signals from the chest piece into electrical signals, and then wirelessly transmits the signals to a second location to be amplified, filtered, recorded, and played back for the operator with improved sound quality and level. The elimination of tubing further decreases infection risk, increases mobility for the operator, provides a means for telemedicine, and extends access to patient health information and history through electronic medical records.