A device for impedance measurements on body segments. Outputs of a current source are connected to inputs of current changeover switches. Each current changeover switch has outputs that are interconnectable with the input of the respective current changeover switch. The outputs of the current changeover switches are connected to electric feed lines of current electrodes. Measuring electrodes detect voltage signals, which are used with the current supplied by the current source for the impedance measurements of the body segments. Switching devices are incorporated into the electric feed lines near the current electrodes. By switching the current changeover switches and switching devices, the device respectively connects only two current electrodes to the current source and disconnects all other current electrodes from the electric feed line by switching the switching device and the electric feed line from the current source by switching the current changeover switches.

An information processing system includes first and second electrodes for measuring cardiac potential, a pulse wave sensor that is disposed closer to the first electrode than to the second electrode and that measures a pulse wave, a buffer that amplifies a signal acquired by the first electrode, an interconnect wire that electrically connects the first electrode to a terminal of the buffer, a shield that shields the first electrode and the interconnect wire, and a shield potential generator that includes a first buffer circuit and a second buffer circuit having a larger drive current than the first buffer circuit and that starts applying, to the shield, a first generation signal generated by the first buffer circuit based on the acquired signal before a predetermined time point when the pulse wave is measured and starts applying a second generation signal generated by the second buffer circuit at the predetermined time point.

A computer-implemented method can include determining an amplitude for each of a plurality of input channels, corresponding to respective nodes. A measure of similarity can be computed between the input channel of each node and the input channel of its neighboring nodes. The method can also include comparing an amplitude for each node relative to other nodes to determine temporary bad channels. For each of the temporary bad channels, a measure of similarity can be computed between the input channel of each node and the input channel of its neighboring nodes. Channel integrity can then be identified based on the computed measures of similarity.

An ECG sensor chip used in a wearable appliance includes; a switch controlled by a switching signal, an amplifier that amplifies a difference between first and second ECG signals, and a location indicator that generates the switching signal. The switch passes either a first ECG signal or second ECG signal in response to the switching signal.

Medical catheterization is carried out by receiving a plurality of analog bioelectric signals in respective channels and multiplexing the bioelectric signals in respective selection events. The selection events comprise making a first connection with a reference voltage, thereafter breaking the first connection and making a second connection with one of the bioelectric signals. The method is further carried out by outputting the multiplexed bioelectric signals to an analog-to-digital converter.

An analog front end (AFE) system for substantially eliminating quantization error or noise can combine an input of an integrator circuit in the AFE system with an input of the digital-to-analog converter (DAC) circuit in the feedback loop of the AFE system. By combining the input of the integrator with the input of the DAC circuit in the feedback loop, the in-band quantization noise of the filter can be substantially eliminated, thereby improving measurement accuracy.

An analog front end system can include a filter bypass switch connected in a boot-strapped configuration to pull a control terminal of the filter bypass switch above or below a supply voltage. Using bootstrapped switches can allow both the charge injection and capacitive coupling of the bypass switches of a differential anti-alias filter (AAF) to be common mode. A differential input signal of the ADC is not affected by the charge injection and capacitive coupling of the bypass switches in the AAF filter to a first order.

The invention relates to an electrocardiograph sensor mat (100), the mat (100) comprising a multitude of electrodes (104) for acquiring cardiac signals and a plug (200), wherein the electrodes (104) are connected to the plug (200) by electric wires (102), wherein the wires (102) are segmented by switches (202), wherein the switches (202) are switchable between a closed state and an open state, wherein in the closed state the electrodes (104) are electrically connected to the plug (200) and wherein in the open state the electrodes (104) are electrically isolated from the plug (200).

Disclosed is a card type electrocardio measuring device, including: a circuit board (101), a main body bracket (102) and a back encapsulation; the circuit board (101) is arranged on the front of the main body bracket (102); the back encapsulation is arranged on the back of the main body bracket (102); the main body bracket (102) has a hollow shape, and electronic components on the circuit board (101) are respectively accommodated fitly between the back of the circuit board (101) and the back encapsulation, in a way of penetrating a hollow portion of the main body bracket (102).

A noninvasive ergonomic self-use device including a plurality of electrodes and a processor in electrical communication with the electrodes, the processor is configured to switch two or more of the electrodes between at least an ECG mode of operation in which the electrodes receive user body signals and an EPG mode in which the electrodes generate electrical pulses for stimulating the abdominal muscles of the user.