The disclosed biopotential measurement device may include a front end comprising a biopotential measurement sensor and a back end comprising a processor programmed to process biopotential signals detected by the biopotential measurement sensor. The biopotential measurement device may also include an isolation circuit that, during at least a sampling phase of the biopotential measurement sensor, electrically isolates the front end from the back end. Various other methods, systems, and computer-readable media are also disclosed.

The disclosed biopotential measurement device may include a front end comprising a biopotential measurement sensor and a back end comprising a processor programmed to process biopotential signals detected by the biopotential measurement sensor. The biopotential measurement device may also include an isolation circuit that, during at least a sampling phase of the biopotential measurement sensor, electrically isolates the front end from the back end. Various other methods, systems, and computer-readable media are also disclosed.

A safety circuit, in the form of a switch box, for coupling with a catheter, detects DC leakage or emission from an amplifier circuit of the catheter, and switches a switch to immediately terminates (cuts-off) power to the amplifier circuit. This immediate power termination instantaneously stops DC leakage, which if left unchecked or otherwise undetected, may reach the heart, and disrupt its electrical activity and cause other damage.

The embodiments include an apparatus used in combination with a computer for sensing biopotentials. The apparatus includes a catheter in which there is a plurality of sensing electrodes, a corresponding plurality of local amplifiers, each coupled to one of the plurality of sensing electrodes, a data, control and power circuit coupled to the plurality of local amplifiers, and a photonic device bidirectionally communicating an electrical signal with the data, control and power circuit. An optical fiber optically communicated with the photonic device. The photonic device bidirectionally communicates an optical signal with the optical fiber. An optical interface device provides optical power to the optical fiber and thence to the photonic device and receives optical signals through the optical fiber from the photonic device. The optical interface device bidirectionally communicates an electrical data, control and power signal to the computer.

An electrode system is provided for sensing and/or stimulating a brain while reducing risk associated with the sensing and stimulation. The system is scalable to different numbers of contacts to span large areas of the brain. The system includes an electrode array made with a plurality of patches connected together physically and electrically. The array and/or each patch can have its own respective intelligent multiplexer and/or intelligent demultiplexer to aggregate the respective sense and/or stimulate signals, thereby reducing the wire count down to a single wire or wireless link. The array or each patch can have an embedded ground plane, thus minimizing the susceptibility to external EM noise. Moreover, the physical resolution of the array or each patch can be adjusted as needed.

In an embodiment, there is provided an apparatus. The apparatus includes an analog front end for biosignal acquisition. The analog front end includes an instrumentation amplifier and a reconfigurable filter. The instrumentation amplifier is configured to receive a biosignal and includes a super class-AB output stage. The reconfigurable filter is coupled to an output of the instrumentation amplifier. The reconfigurable filter has a selectable gain and an adjustable bandwidth. The bandwidth is adjusted based, at least in part, on a duty cycle of a clock signal.

In an embodiment, there is provided an apparatus. The apparatus includes an analog front end for biosignal acquisition. The analog front end includes an instrumentation amplifier and a reconfigurable filter. The instrumentation amplifier is configured to receive a biosignal and includes a super class-AB output stage. The reconfigurable filter is coupled to an output of the instrumentation amplifier. The reconfigurable filter has a selectable gain and an adjustable bandwidth. The bandwidth is adjusted based, at least in part, on a duty cycle of a clock signal.

The present invention provides a circuit applied to a biopotential acquisition system, wherein the circuit includes an active current source and an amplifier. In the operations of the circuit, the active current source is configured to provide a current to two input terminals of the circuit, wherein the two input terminals of the circuit are coupled to two input electrodes of the biopotential acquisition system; and the amplifier is configured to receive input signals from the two input terminals to generate an output signal.

The present invention provides a circuit applied to a biopotential acquisition system, wherein the circuit includes an active current source and an amplifier. In the operations of the circuit, the active current source is configured to provide a current to two input terminals of the circuit, wherein the two input terminals of the circuit are coupled to two input electrodes of the biopotential acquisition system; and the amplifier is configured to receive input signals from the two input terminals to generate an output signal.

The present invention relates to a body electrode for recording electrophysiological signals from a body. In particular the invention relates to a body electrode (100; 200; 400) comprising a transducer element (105; 205) shielded by a layered shield structure (120; 220; 420) and a skin contact element (115; 115′; 115″; 215) providing a contactbetween the layered shield structure (120; 220; 420) and the skin (101; 201) of the body. The layered shield structure (120; 220; 420) comprises at least an electrically conducting layer (113; 213) and an electrostatic dissipative layer (112; 212; 412). The skin contact element (115; 115′; 115″; 215) comprises an electrically onducting layer (113; 213) and an ion conducting layer (114; 214) and is with regards to the electrical potential characteristics matched with a transducer element (105; 205).