Method and apparatus for communicating between an ambulatory medical device and a control device via telemetry using randomized data

US7171274B2 · kind B2 · utility

Assignee

• MEDTRONIC MINIMED, INC. · US

Inventors

• Timothy J. Starkweather · Simi Valley, US
• Ronald J. Lebel · West Hollywood, US
• Daniel H. Villegas · San Fernando, US
• Philip T. Weiss · Pasadena, US
• John T. Armstrong · Pasadena, US
• John D. Richert · La Habra, US

Key dates

• Filing date: May 12, 2003
• Grant date: Jan 30, 2007
• Expiry date: Jan 21, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49826
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An implanted medical device (e.g. infusion pump) and handheld communication device communicate with one another via telemetry wherein transmitted messages have enhanced numbers of and/or regularity of bit transitions to minimize the risk of synchronization loss between transmitted bits of data and received bits of data. Bit transitions for portions of messages may be enhanced by applying a pseudo-randomization scheme to those portions of messages that are transmitted in a way that allows the receiver to extract the original data from the received randomized data. Preferred randomization techniques modify (i.e. randomize) the data using a CRC value that is being accumulated while simultaneously causing the modified data to modify subsequent accumulation of the CRC itself. Upon reception, the reversal of data randomization occurs so that the intended message is appropriately received.