Abstract: Detects external noise using a motion sensor signal for example to increase the specificity of arrhythmia detections based on active muscle noise detection. Whenever a motion signal is present that is below or above a certain frequency, for example 5 Hz, or within a certain frequency range, for example 1 to 10 Hz, and/or above a certain amplitude, for example greater than 1 mg, or close to a known motion pattern, then the detection of fast ventricular arrhythmia is suspended. For the detection of slow arrhythmia, for example asystole or syncope, an episode is confirmed when a short lasting motion sensor signal occurs. Uses a motion sensor based signal, for example as obtained from an accelerometer on an implantable electrode lead and/or implantable device.

Abstract: Implantable electromedical device or loop recorders or ILRs that solve the problem of very low arrhythmia detection specificities in, i.e., high number of false positives, based on detection and analysis of external noise, specifically muscle noise surrounding the electromedical device. Embodiments generally employ active detection of lead or device movement that induces signal artifacts indicative of external noise. One or more embodiments may detect lead or device movement through use of a piezoelectric transducer, for example located proximally to the device or in the lead of the electromedical.

Abstract: One embodiment of the present invention relates to a system for deriving physiologic measurement values that are relative to ambient conditions. In one embodiment, the system comprises an implantable medical device (“IMD”), an external computing device, and a backend computing system. The IMD determines an absolute physiologic parameter value within a patient's body, and communicates the absolute physiologic parameter value outside the patient's body, for example, to the external computing device. Further, the external computing device receives the absolute physiologic parameter from the IMD and communicates it to the backend computing system. The backend computing system receives the absolute physiologic parameter value and obtains an ambient condition value outside the body that can affect the absolute physiologic parameter value.

Abstract: An implantable medical device includes an acoustic transducer for intra-body communication with another medical device via an acoustic couple. The acoustic transducer includes one or more piezoelectric transducers. In one embodiment, an implantable medical device housing contains a cardiac rhythm management (CRM) device and an acoustic communication circuit. The acoustic transducer is electrically connected to the acoustic communication circuit to function as an acoustic coupler and physically fastened to a wall of the implantable housing, directly or via a supporting structure.

Abstract: A diversity antenna system including a plurality of antennas can include an antenna interface circuit configured to connect an antenna of the plurality of antennas to a transceiver using an antenna selection signal. The antenna control circuit can be configured to produce the antenna selection signal using at least one of a random sequence generator configured to generate a random antenna selection signal or a predetermined sequence generator configured to generate a predetermined antenna selection signal according to a predetermined sequence.

Abstract: An implantable medical device includes an acoustic transducer for intra-body communication with another medical device via an acoustic couple. The acoustic transducer includes one or more piezoelectric transducers. In one embodiment, an implantable medical device housing contains a cardiac rhythm management (CRM) device and an acoustic communication circuit. The acoustic transducer is electrically connected to the acoustic communication circuit to function as an acoustic coupler and physically fastened to a wall of the implantable housing, directly or via a supporting structure. In one embodiment, the implantable medical device receives an incoming acoustic signal from the other medical device, detects an error rate associated with the incoming acoustic signal, and adjusts a carrier frequency for an outgoing acoustic signal to be transmitted to the other medical device using the error rate.

Abstract: An implantable medical device such as a cardiac pacemaker or implantable cardioverter/defibrillator with the capability of storing body temperature measurements taken periodically and/or when triggered by particular events.

Abstract: An implantable medical device such as a cardiac pacemaker or implantable cardioverter/defibrillator with the capability of storing body temperature measurements taken periodically and/or when triggered by particular events.

Abstract: One embodiment of the present invention relates to an implantable medical device (“IMD”) that can be programmed from one operational mode to another operational mode when in the presence of electro-magnetic interference (“EMI”). In accordance with this particular embodiment, the IMD includes a communication interface for receiving communication signals from an external device, such as a command to switch the IMD from a first operation mode to a second operation mode. The IMD further includes a processor in electrical communication with the communication interface, which is operable to switch or reprogram the IMD from the first operation mode to the second operation mode upon receiving a command to do so. In addition, the IMD includes a timer operable to measure a time period from when the processor switches the IMD to the second operation mode.

Abstract: An implantable medical device comprising a far field RF transmitter and receiver, a controller circuit communicatively coupled to the RF transmitter and receiver, and a wakeup timer circuit integral to, or communicatively coupled to, the controller. The controller is configured to initiate power up of the RF transmitter and receiver during a wakeup interval defined by the wakeup timer circuit, detect a digital key received from a second device during the wakeup interval, transmit a response using the RF transmitter when the digital key is received, and receive a communication from the second device and resynchronize the wake-up timer according to a time of the communication.

Abstract: An implantable medical device comprises a near field telemetry module to wirelessly receive first information into the IMD, a far field telemetry module to wirelessly receive second information into the IMD, and a processor in electrical communication with the near field telemetry module and the far field telemetry module. The processor is configured to establish, in relation to a communication signal received by the near field telemetry module, a time period during which communication via the far field telemetry module is available, and operate the IMD according to the received second information upon receiving third information via the near field telemetry link.

Abstract: One embodiment of the present invention relates to an implantable medical device (“IMD”) that can be programmed from one operational mode to another operational mode when in the presence of electro-magnetic interference (“EMI”). In accordance with this particular embodiment, the IMD includes a communication interface for receiving communication signals from an external device, such as a command to switch the IMD from a first operation mode to a second operation mode. The IMD further includes a processor in electrical communication with the communication interface, which is operable to switch or reprogram the IMD from the first operation mode to the second operation mode upon receiving a command to do so. In addition, the IMD includes a timer operable to measure a time period from when the processor switches the IMD to the second operation mode.

Abstract: An apparatus and method for enabling far-field radio frequency communications with an implantable medical device in which an antenna structure is disposed within a header assembly of the device. The antenna structure, in various embodiments, includes a monopole antenna, a dipole antenna, an inverted F antenna, a patch antenna and a slot antenna.

Abstract: An implantable medical device comprises a near field telemetry module to wirelessly receive first information into the IMD, a far field telemetry module to wirelessly receive second information into the IMD, and a processor in electrical communication with the near field telemetry module and the far field telemetry module. The processor is configured to establish, in relation to a communication signal received by the near field telemetry module, a time period during which communication via the far field telemetry module is available, and operate the IMD according to the received second information upon receiving third information via the near field telemetry link.

Abstract: An apparatus and method for enabling far-field radio frequency communications with an implantable medical device in which an antenna structure is disposed within a header assembly of the device. The antenna structure, in various embodiments, includes a monopole antenna, a dipole antenna, an inverted F antenna, a patch antenna and a slot antenna.

Abstract: An implantable medical device comprises a near field telemetry module, a far field telemetry module, and a processor in electrical communication with the near field telemetry module and the far field telemetry module. The processor is configured to establish, in relation to a communication signal received by the near field telemetry module, a time period during which communication via the far field telemetry module is available, authenticate a far field communication session using the far field telemetry module, and communicate using the far field telemetry module upon authentication of the communication session.

Abstract: A system and method for securely authenticating a data exchange session with an implantable medical device is presented. A crypto key uniquely associated with an implantable medical device is defined to authenticate data during a data exchange session. A secure connection is established from an external source with a secure key repository securely maintaining the crypto key. Authorization to access data on the implantable medical device is authenticated by securely retrieving the crypto key from the secure key repository.

Abstract: Integrity of a wirelessly telemetered message communicated between an implantable medical device and an external programmer is authenticated by encoding the message. The message is encrypted based on a random number or time stamp and a secret key. The message is authenticated by encryption and decryption or by executing a hash function.

Abstract: A telemetry system for radio-frequency communications between an implantable medical device and an external device providing improved noise immunity is disclosed. Multiple communications channels are used to enable establishment and re-establishment of communications between a particular pair of devices in a multiple device environment.

Abstract: A system and method for providing digital data communications over a wireless intra-body network is presented. A physical protocol layer is logically defined with an identifier uniquely assigned to a plurality of implantable devices in an intra-body network. Functions are specified within the physical protocol layer to transact data exchange over a wireless interface. A slave implantable device is activated in response to an activation signal transmitted through the wireless interface by a master implantable device. A wireless communications link is established between the slave implantable device and the master implantable device upon matching of the identifier assigned to the slave implantable device. Data is communicated intra-bodily over the communications link.