Cardiac Pacemakers, Inc.

Eta Systems, Inc.

Thomas J Harris

Allan Thomas Koshiol

Joseph E Bange

Paul Jeffrey Holmquist

Karen M Lent

Karen M Kramer

Scott Thomas Mazar

Jeffrey Allen Von Arx

David J Yonce

Ron A Balczewski

William J Linder

David L Perschbacher

James O Gilkerson

Scott R Stubbs

Paul J Huelskamp

Kenneth Paul Hoyme

Bryan S Datema

Scott R Vanderlinde

Binh C Tran

Doug M Birkholz

Sylvia Quiles

Hiten J Doshi

Conrad L Sowder

Mehdi Katoozi

Ramprasad Vijayagopal

Clint D Glunz

Douglas J Gifford

Krishna Sridharan

Ken Cowan

Dennis Fazio

Sr Bartlett William P

Methods and systems for media access control allow master and slave nodes of a network to communicate using the same carrier while avoiding collisions of transmissions. At least one slave node is an implantable device. Master nodes initiate all data exchange sequences, and slave nodes are responsive to the data exchange sequences. The exchange sequences begin by master nodes contending for use of the carrier through a countdown procedure. A set order of communications occurs between a master node who won the contention and a slave node being communicated with by the master node to transfer a data frame. Contention is then repeated to determine the next master node that is allowed to transfer a data frame. New master nodes entering the network employ a discovery process to poll for existing devices in the network.

Methods and systems for providing multiple access within a network

A method comprises connecting at least one portion of a far-field radio-frequency (RF) first telemetry circuit in an implantable medical device to an energy source through a power connection module, detecting information included in a first predetermined wireless signal, changing a conductivity state of the power connection module when the information in the first predetermined wireless signal is detected to couple power to the at least one portion of the first telemetry circuit, detecting a second predetermined wireless signal, and changing a conductivity state of the power connection module to decouple power to the at least one portion of the first telemetry circuit when the second predetermined wireless signal is detected and the first telemetry circuit enters an idle state.

Methods and apparatuses for implantable medical device telemetry power management

A telemetry system is presented for enabling wireless communications between an implantable medical device and an external device in a manner which reduces the power requirements of the implantable device by duty cycling its wireless communication circuitry. A wakeup scheme for the implantable device is provided in which the external device transmits a data segment containing a repeating sequence of special wakeup characters in order to establish a communications session with the implantable device. The wakeup scheme may be designed to operate in the context of a handshaking protocol for collision avoidance.

System and method for RF wake-up of implantable medical device

A method of operating an implantable medical device (IMD) includes demodulating a data signal incoming to the IMD, serially storing demodulated data received in the data signal in a first serial buffer register, transferring the received demodulated data to a parallel buffer register from the first serial buffer register, wherein the parallel buffer register operates according to a clock signal having a lower frequency than a clock signal used to operate a serial buffer register, switching the serial storing of demodulated data to a second serial buffer register during the transferring of the received demodulated data to the parallel buffer register, and alternating the serial storing of the received data between the first and second serial buffer registers.

Telemetry double buffering and oversampling for an implantable medical device

This document discusses, among other things, an implantable device comprising a communication circuit configured to communicate with an external device, a logic circuit communicatively coupled to the communication circuit, and a processor, communicatively coupled to the logic circuit and the communication circuit. The processor is configured to communicate information with the external device, via the communication circuit and the logic circuit, using a set of communication messages. While in a device safety mode, the processor is held in an inactive state and the logic circuit is configured to communicate with the external device using a subset of the set of communication messages.

Telemetry during safety mode operation

This document discusses, among other things, a communication circuit for an IMD comprising a radio frequency (RF) modulator to modulate and demodulate IMD data signals, first and second serial buffer registers to store received demodulated data and to store transmit data for modulation and configured to operate according to a first clock signal, and a parallel buffer register to receive data in parallel from the first and second serial buffer registers and configured to operate according to a second clock signal that is slower than the first clock signal. The communication circuit also includes a telemetry control circuit configured to, when in the receive mode, alternate between serially receiving data into the first serial buffer register while the parallel buffer receives data from the second serial buffer register, and serially receiving data into the second serial buffer register while the parallel buffer receives data from the first serial buffer.

A telemetry system is presented for enabling radio-frequency (RF) communications between an implantable medical device and an external device in a manner which reduces the power requirements of the implantable device by duty cycling its circuitry. A wakeup scheme for the implantable device is provided in which the external device transmits a data segment containing a repeating sequence of special wakeup characters in order to establish a communications session with the implantable device. The wakeup scheme may be designed to operate in the context of a handshaking protocol for collision avoidance.

A telemetry system is presented for enabling radio-frequency (RF) communications between an implantable medical device and an external device in a manner which reduces the power requirements of the implantable device by duty cycling its RF circuitry.

System and method for RF transceiver duty cycling in an implantable medical device

A system and method for in situ trimming of oscillators in a pair of implantable medical devices is provided. Each frequency over a range of oscillator trim frequencies for an initiating implantable medical device is selected and a plurality of commands are sent via an acoustic transducer in situ over the frequency selected. Each frequency over a range of oscillator trim frequencies for a responding implantable medical device is selected and a response to each of the commands received is sent via an acoustic transducer in situ over the frequency selected. The responses received by the initiating implantable medical device are evaluated and a combination of the oscillator trim frequencies for both implantable medical devices that together exhibit a strongest acoustic wave is identified. Oscillators in both implantable medical devices are trimmed to the oscillator trim frequencies in the combination identified.

System and method for in situ trimming of oscillators in a pair of implantable medical devices

A telemetry system is presented for enabling radio-frequency (RF) communications between an implantable medical device and an external device in a manner which reduces the power requirements of the implantable device by duty cycling its RF circuitry. A wakeup scheme for the implantable device is provided in which the external device transmits a data segment containing a repeating sequence of special wakeup characters in order to establish a communications session with the implantable device. The wakeup scheme may be designed to operate in the context of a handshaking protocol for collision avoidance.

The selection of one communication channel from a plurality of available channels is determined by a state machine. In an automatic selection mode, a first telemetry system has priority over other telemetry systems. A communication session is in progress based on session initiation and termination triggers. An override function allows manual selection of a telemetry system.

Telemetry switchover state machine with firmware priority control

An implantable medical device includes a radio-frequency (RF) telemetry circuit connected to an energy source through a power connection module to obtain power when a user initiates an RF telemetry session. After the session is completed, the power connection module shuts off the at least one portion of the RF telemetry circuit. Power-on examples include a wireless telemetry activation signal received by a low power radio receiver in the implantable device, a physical motion detected by an activity sensor therein, an activation of an inductive telemetry circuit therein, a magnetic field detected by a magnetic field detector therein, and/or a telemetry activation signal detected by a sensing circuit included therein. Power-off examples include a wireless termination signal received by the implantable device, a delay timeout after the session, and/or a signal received by an inductive telemetry circuit in the implantable device.

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Shoreview, MN, United States of America

Thomas J Harris