A signal processing apparatus includes: a difference signal acquirer configured to obtain a difference signal reflecting a change in an input signal at a preset time interval based on a reference signal; a signal amplifier configured to amplify the difference signal; and a signal restorer configured to generate an output signal by converting the amplified difference signal to a digital signal and the digital signal.

A system (116, 120) for electrically limiting leakage current in a patient-connected medical device (100). The system (116, 120) includes a first set (116) of one or more switching devices (118) that selectively connect a first power output (124) of a battery compartment (110) of the patient-connected medical device (100) with a first power input (126) of electronic components (102) of the patient-connected medical device (100) based on a first polarity of input voltage from the battery compartment (110). The system (116, 120) further includes a second set (120) of one or more switching devices (122) that selectively connect a second power output (128) of the battery compartment (110) of the patient-connected medical device (100) with a second power input (130) of the electronic components (102) based on a second polarity of the input voltage, wherein the first polarity is opposite the second polarity.

A physiological data acquisition system includes at least one interface module and a base unit configured to communicatively connect to the at least one interface module to receive the physiological signals recorded by a catheter. Each interface module is formed by mating at least a first one of the two or more different personality modules to a dock. The dock has a multi-modal connection port configured to directly connect to a dock connector of any one of the two or more different personality modules so as to receive physiological signals therefrom. The first personality module includes a first catheter connector configured to receive a connection end of the catheter so as to receive physiological signals therefrom, and a first dock connector configured to connect to the multi-modal connection port of the dock so as to provide the physiological signals thereto.

A method includes providing a first electrode and a second electrode, receiving a first plurality of signals from the first electrode during a first period of time, and receiving a second plurality of signals from the second electrode during a second period of time. The method also includes receiving a pooled signal comprising a third plurality of signals from the first electrode and a fourth plurality of signals from the second electrode and isolating, from the pooled signal, one or more of the third plurality of signals and one or more of the fourth plurality of signals.

A method includes providing a first electrode and a second electrode, receiving a first plurality of signals from the first electrode during a first period of time, and receiving a second plurality of signals from the second electrode during a second period of time. The method also includes receiving a pooled signal comprising a third plurality of signals from the first electrode and a fourth plurality of signals from the second electrode and isolating, from the pooled signal, one or more of the third plurality of signals and one or more of the fourth plurality of signals.

A data acquisition device includes an integrated circuit and an information processor. The integrated circuit has a first terminal for receiving a master/slave switching signal upon start of data acquisition, an ADC for converting analog input data to digital data, and an output terminal for outputting the digital data. The information processor generates the master/slave switching signal, and has a second terminal connected to the first terminal and for outputting the master/slave switching signal, and an input terminal connected to the output terminal and for receiving the digital data. The information processor operates in the master mode when the integrated circuit operates in the slave mode. The information processor operates in the slave when the integrated circuit operates in the master mode. The integrated circuit outputs the digital data when operating in the master mode according to the master/slave switching signal.

A data acquisition device includes an integrated circuit and an information processor. The integrated circuit has a first terminal for receiving a master/slave switching signal upon start of data acquisition, an ADC for converting analog input data to digital data, and an output terminal for outputting the digital data. The information processor generates the master/slave switching signal, and has a second terminal connected to the first terminal and for outputting the master/slave switching signal, and an input terminal connected to the output terminal and for receiving the digital data. The information processor operates in the master mode when the integrated circuit operates in the slave mode. The information processor operates in the slave when the integrated circuit operates in the master mode. The integrated circuit outputs the digital data when operating in the master mode according to the master/slave switching signal.

A method for non-invasively identifying a location of a subcutaneous tumor comprising: providing a patient with a possible subcutaneous tumor; providing a detector comprising one or more radio-frequency (RF) planar resonant loop sensors, each sensor comprising a planar resonant loop and an element disposed within and co-planar with a loop formed by the planar resonant loop; creating a first localization map of resonant frequencies of an area including the possible tumor using the detector; and creating a second localization map of |s.sub.11| reflection coefficients of the area including the possible tumor using the detector.

A method for non-invasively identifying a location of a subcutaneous tumor comprising: providing a patient with a possible subcutaneous tumor; providing a detector comprising one or more radio-frequency (RF) planar resonant loop sensors, each sensor comprising a planar resonant loop and an element disposed within and co-planar with a loop formed by the planar resonant loop; creating a first localization map of resonant frequencies of an area including the possible tumor using the detector; and creating a second localization map of |s.sub.11| reflection coefficients of the area including the possible tumor using the detector.

A system and method for a multi-function remote ambulatory cardiac monitoring system. The system includes a housing and a microprocessor disposed within the housing. The microprocessor controls the remote ambulatory cardiac monitoring system. The system also includes an electrode for sensing ECG signals and the electrode being in communication with the microprocessor. An integrated cellular module also is included in the system, and the cellular module is connected to the microprocessor and disposed within the housing. The integrated cellular module transmits ECG signals to a remote center.