Systems and methods for suppressing electrical noise in an electrocardiogram (ECG) signal obtained by at least one electrode and displayed on an ECG monitor are disclosed. The system includes a conductive material distinct from the at least one electrode and configured to contact a surface of a patient, and filtering circuitry connected in series between the conductive material and ground. The filtering circuitry may be configured to filter to ground the electrical noise present within the patient before it is received by the at least one electrode and is prevented from distorting the ECG signal that is displayed on the ECG monitor.

Techniques for sensing neural responses such as Evoked Compound Action Potentials (ECAPs) in an implantable stimulator device are disclosed. A first therapeutic pulse phase is followed by a charge recovery phase that includes at least one high-impedance passive charge recovery duration. The ECAP is sensed during the high-impedance passive charge recovery duration. The time period of the passive charge recovery is lengthened and the high-impedance passive recharge duration entirely overlaps the ECAP (i.e., the neural response duration) at the sensing electrode.

A system and method adapted for at least one health-related application selected from physiological monitoring, defibrillation, and pacing in the presence of electromagnetic interference (EMI) using the time-domain features of EMI patterns and physiological waveforms. The invention enables EMI detection and identification in a plurality of signals, including various physiological signals, which may contain both physiological information and EMI-generated artifacts. The system utilizes adaptive and versatile modular architecture with a set of modules for various filtering, conditioning, processing, and wireless transmission functions, which can be assembled in different configurations for different settings. In some preferred embodiments, the method and system of this invention are incorporated into (or attached to) an external cardiac defibrillator/monitor or cardiac pacing device. Other preferred embodiments include a wireless monitoring system that provides reliable wireless data transmission during patient table (bed) movement.

A neurostimulation device has a stimulus, and a position of a measurement electrode relative to the stimulus, configured such that in artefact as arising relative to distance from the stimulus electrode a minima region of the artefact is substantially co-located with the measurement electrode. Or, a ratio of the inter-electrode spacing to the electrode length is between 2 and 3.66. Or, an impedance is connected to a passive electrode and is configured to reduce artefact arising on the measurement electrode.

A medical apparatus includes a therapy component for performing a therapeutic procedure on the patient. The therapy component includes sensing circuitry for sensing electrical signals from one or more sensing electrodes of the therapy component that are placed on and/or in the patient. With the medical apparatus powered on, a determination is made as to when the therapy component is actively engaged in performing the therapeutic procedure on the patient. When the therapy component is actively engaged in performing the therapeutic procedure on the patient, the one or more sensing electrodes of the therapy component are electrically connected to the sensing circuitry. When the therapy component is determined to not be actively engaged in performing the therapeutic procedure on the patient, the one or more sensing electrodes of the therapy component are electrically isolated from the sensing circuitry.

Circuits are provided for detecting an electrosurgical unit signal. An example circuit includes: a filter configured to process a floating ground signal associated with measuring a bio-potential signal of a patient, and a detector configured to output a sensing signal based at least in part on the floating grounding and the Earth ground for detecting an electrosurgical unit signal.

A hemodynamic monitor is configured to receive a hemodynamic sensor signal representative of arterial blood pressure (ABP) of a patient. The hemodynamic monitor segregates the received hemodynamic sensor signal into a plurality of heartbeat portions that are each representative of the ABP of the patient for one of a plurality of individual heartbeats. For each heartbeat portion, the hemodynamic monitor determines a set of coefficients representative of frequency components of the respective heartbeat portion to produce a plurality of sets of coefficients. Each set of coefficients is normalized. A set of reference coefficients is determined based on the sets of normalized coefficients. A quality indicator associated with an individual heartbeat is provided based on a comparison of a set of normalized coefficients for the individual heartbeat to the set of reference coefficients. The quality indicator is used to produce a modified hemodynamic sensor signal from which hemodynamic parameters are derived.

The invention provides a system and method for detecting a paced rhythm in a twelve lead ECG. A high-pass filter receives a signal from an ECG lead and pacer spikes within the high-pass filtered signal are distinguished from noise by setting certain threshold limits. Subsequently, clusters of pacer spikes are detected and raw pacer spikes corresponding to each cluster are determined. A pruning process is performed to identify one pacer spike corresponding to each paced beat and raw pacer spike with largest amplitude within a cluster is retained and other pacer spikes within the cluster are eliminated. Further, potential pacer spikes in the ECG lead are determined by eliminating pacer spikes in sections with missing data or high amount of noise. Further post-processing steps are performed to declare the identification of the paced rhythm in the ECG lead.

The present disclosure provides systems, methods, and processes for detecting electrode wire noise caused by flexing or deflection of a distal tip of a probe. Various sensor configurations are disclosed for detecting this noise, including displacement sensors for probe actuators and sensing wires integrated with the probe electrode wires.

Disclosed herein are a system and a method for volitional electromyography (vEMG) signal detection from an EMG signal when functional electrical stimulation (FES) is applied. The system for vEMG signal detection includes a receiver for receiving data from an EMG electrode when FES is applied, a memory for storing a program for detecting a vEMG signal using the received data, and a processor for executing the program, wherein the processor cuts the data received from the EMG electrode disposed at a predetermined position, calculates a difference between data for previous FES and data for current FES, and detects the vEMG signal using the calculated difference.