Biotronik Se Co. Kg

Ramprasad Vijayagopal

Marcelo Baru

Kurt Swenson

Alan Fryer

Karl-Heinz Freiberg

A medical system contains a first implantable device and a second implantable device. Each implantable device contains a communication unit configured to transmit an ultrasonic signal to the communication unit of another implantable device of the medical system. The first implantable device is configured to periodically transmit a broadcast message to at least the second implantable device using the communication unit of the first implantable device.

Intra-cardiac communications using ultrasound to provide direct timing information without electrical interferences

A pacing system, which is particularly suitable for implantable leadless pacemakers, applies passively-balanced voltage-based pacing pulses, and periodically performs capture verification (evoked response detection) by following a pacing pulse with a current-based active balancing pulse, and then measuring any evoked response provoked by the pacing pulse. The active balancing pulse reduces residual charge on the electrodes used for pulsing, and thereby reduces polarization artifacts that could obscure measurement of the evoked response at the electrodes. The amplitude and pulse width of the active balancing current pulse are defined by measurements made in a few preceding pulses. The pacemaker preferably detects indicia of cardiac contractility, and performs capture verification only when contractility indicates that the patient is physically inactive and emotionally stable.

System and methods for capture verification in implantable leadless pacemakers

Electrical stimulation of a target (e.g., nervous tissue) is performed, wherein balance phases are automatically determined, and at least one of the electrodes is indirectly monitored during therapy delivery. The stimulation system is further configured to generate correction currents when a voltage accumulated at associated double layer capacitances crosses pre-defined thresholds so as to reduce or cancel the accumulated voltages without therapy interruption. A finer automatic determination of balance phases permits minimizing the stimulus artifact for evoked response sensing. Closed-loop neurostimulation may be performed based on such evoked responses.

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Sugar Land, TX, United States of America

Ramprasad Vijayagopal