Abstract: A stimulator device for providing a stimulation signal comprises: a stimulation signal generating unit configured to generate a stimulation current signal and provide the stimulation current signal to an output of the stimulation signal generating unit, wherein the stimulation current signal comprises a sinusoidal-like waveform; and an impedance monitoring unit connected to the output of the stimulation signal generating unit, wherein the impedance monitoring unit is configured to, while the stimulation current signal is provided on the output of the stimulation signal generating unit, determine an extreme voltage at an extreme point of a voltage signal at the output and a phase delay between the voltage signal and the stimulation current signal for determining information of an impedance relating to an interface between an electrode, connected to the output, and tissue.

Abstract: An apparatus for controlling conduction of an electrical signal in a heart comprises: a stimulation generating unit; a first pair and a second pair of electrodes to be arranged in relation to a location in the heart, wherein an interferential stimulation signal is formed in the location based on first and second stimulation signals received by the first and second pairs of electrodes, wherein a difference between a first frequency of the first stimulation signal and a second frequency of the second stimulation signal defines a beat frequency of the interferential stimulation signal for controlling conduction of the electrical signal; an electrical signal sensor for detecting conduction of the electrical signal; and a control unit for controlling output of the first and the second stimulation signals for controlling timing of the interferential stimulation signal in relation to the electrical signal.

Abstract: A sensor device for sensing a property of a biological material comprises: a biocompatible enclosure comprising a barrier having a first and a second surface; a sensor receptor element arranged at the first surface; a substrate arranged at the second surface carrying an electronic or photonic circuitry comprising a sensor transducer element for reading out signals from the sensor receptor element; and wherein at least one compartment of the biocompatible enclosure is configured to control transport of the biological material into the compartment or is configured to form a hermetical seal around the substrate.

Abstract: A device for stimulating a nerve of a living being comprises: a stimulation generating unit; a first pair of electrodes, a second pair of electrodes, and a third pair of electrodes configured to be arranged in a first, second, and third location, respectively, in relation to the nerve; wherein the stimulation generating unit is configured to generate a first waveform comprising a first frequency; a second waveform comprising a second frequency, and a third waveform comprising a third frequency to the first, second, and third pairs of electrodes, respectively; wherein the first and second frequencies define a beat frequency and the third frequency is related to the beat frequency by an integer number, wherein the stimulation generating unit is configured to output the first, second, and third waveforms for causing interferential stimulation in the nerve.

Abstract: A device for stimulating a nerve comprising: a first stimulation generating unit configured to generate and output a first intermittent current waveform comprising a sequence of first pulses to a first pair of electrodes; a second stimulation generating unit configured to generate and output a second intermittent current waveform comprising a sequence of second pulses to a second pair of electrodes; wherein the first and second intermittent current waveform have a difference in frequency so as to stimulate the nerve using interferential stimulation based on interference between the first and second intermittent current waveform; and a control unit configured to control the interferential stimulation and synchronize the first and the second stimulation generating unit.

Abstract: An implantable device includes a substrate and protective cover that cooperate to define an enclosed sensor volume. A sealed enclosure is provided within the sensor volume, with an electronic component assembly (ECA) being located within the sealed enclosure. A flexible circuit board assembly (FCBA) is electrically coupled with the ECA through a wall of the sealed enclosure. At least one transducer is provided on the FCBA in contact with the substrate, and the FCBA is held apart from the enclosure via a polymeric spacer provided therebetween. An inert polymer fill is provided within the sensor volume external to the enclosure.

Abstract: A device for monitoring bone density comprises: a first electrode unit comprising a first electrode area to be arranged within a bone; a second electrode unit comprising a second electrode area to be arranged outside the bone, wherein the first and the second electrode units are configured for being arranged such that an electrical signal between the first and the second electrode areas travels through a cortical bone portion of the bone; an injection signal generating unit configured to provide an injection signal for generating the electrical signal; and a measurement unit configured to detect a measurement signal induced by the injection signal for determining an impedance between the first and the second electrode areas as a measure of bone density.

Abstract: A patient monitoring system, including: a bone plate configured to be secured to a bone; a plurality of sensors on the bone plate configured to: measure a parameter; transmit a data signal communicating the measured parameter value; and wherein the transmitted data signals from the plurality of sensors are time division multiplexed; and an external wireless reader including an antenna, a processor, and wireless communication radio, wherein the external wireless reader is configured to: transmit an modulated RF signal; and receive the time division multiplexed transmitted data signals from the plurality of sensors.

Abstract: An implantable device includes a substrate and protective cover that cooperate to define an enclosed sensor volume. A sealed enclosure is provided within the sensor volume, with an electronic component assembly (ECA) being located within the sealed enclosure. A flexible circuit board assembly (FCBA) is electrically coupled with the ECA through a wall of the sealed enclosure. At least one transducer is provided on the FCBA in contact with the substrate, and the FCBA is held apart from the enclosure via a polymeric spacer provided therebetween. An inert polymer fill is provided within the sensor volume external to the enclosure.

Abstract: A stent is placed inside an aorta of a subject, the stent comprising one or more electrodes, control circuitry, and a first antenna coupled thereto. A second antenna circumscribes a neck of the subject, such that that at least one turn of wire of the second antenna extends from a first position that is anatomically superior to a left clavicle of the subject to a second position that is anatomically inferior to a jugular notch of the subject and from the second position to a third position that is anatomically superior to a right clavicle of the subject. The second antenna transmits an electrical signal to the first antenna via inductive coupling, and is shaped to have an L-shaped projection in a sagittal plane, with an angle between two legs of the L-shaped projection being 80-160 degrees when placed upon a flat surface. Other applications are also described.

Abstract: Apparatus and methods are described including a stent (20) configured to be placed inside an aorta of a subject, the stent comprising one or more electrodes (22), control circuitry (32), and a first antenna (28) coupled thereto. A second antenna (26) is placed on the subject, such that the second antenna extends at least from above a left clavicle of the subject to below a jugular notch of the subject and from below the subject's jugular notch to above a right clavicle of the subject, the second antenna being con figured to transmit an electrical signal to the first antenna via inductive coupling. Other applications are also described.