Abstract: A wound monitoring and/or therapy apparatus can include multiple sensor circuits, a selection circuit coupled to each sensor circuit, and a processor configured to be in communication with the selection circuit. Each sensor circuit can process multiple sensor signals to generate a single output signal from the multiple sensor signals. Each of the sensor signals can correspond to a measurement of a sensor positioned on a substrate that is configured to be positioned at least partially in a wound. The selection circuit can receive the single output signals from the sensor circuits and outputs a selected single output signal. The processor can receive the selected single output signal and decomposes the selected signal output signal into the multiple sensor signals used to generate the selected single output signal. The processor can activate sensors and receive sensor data from the sensors. The processor can digitize the sensor data and transmit the digitized sensor data to a remote controller.

Abstract: A system can include excitation pads that can apply an excitation signal to tissue of a patient. The excitation pads can be connected to an electronic circuit that communicates the excitation signal to the excitation pads. The system can include a measurement sensor that can measure voltage of the tissue. The system can include a controller that can determine impedance of the tissue. The controller can be in communication with the excitation pads, the electronic circuit, and the measurement sensor. The controller can generate the excitation signal. The controller can obtain a current measurement of the excitation signal after it has been communicated through at least a portion of the electronic circuit. The current measurement can correspond to the excitation signal before it is applied to the tissue. The controller can determine impedance of the tissue based on the voltage measurement and the current measurement of the excitation signal.

Abstract: A method and apparatus for providing improved electromagnetic compatibility between a power source (20) and a switching element (22) in a switched mode power supply includes a device (24) for measuring an electrical variable, for example current, that fluctuates as the switching element (22) switches power received from the power source (20). A signal injector (28) is arranged to generate an electrical signal, for example current, of substantially the same amplitude, but opposite polarity, as the measured current, and to inject it between the power source (20) and the switching element (22) so as to tend to minimize fluctuations in the electrical variable.