CA2204163A1 - Method and apparatus for improving the resolution of pulse position modulated communications between an implantable medical device and an external medical device - Google Patents

Method and apparatus for improving the resolution of pulse position modulated communications between an implantable medical device and an external medical device

Info

Publication number
CA2204163A1
CA2204163A1 CA002204163A CA2204163A CA2204163A1 CA 2204163 A1 CA2204163 A1 CA 2204163A1 CA 002204163 A CA002204163 A CA 002204163A CA 2204163 A CA2204163 A CA 2204163A CA 2204163 A1 CA2204163 A1 CA 2204163A1
Authority
CA
Canada
Prior art keywords
medical device
state variable
phase uncertainty
fixed rate
rate until
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002204163A
Other languages
French (fr)
Other versions
CA2204163C (en
Inventor
Kenneth Wilson Fernald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Intermedics Inc
Original Assignee
Sulzer Intermedics Inc.
Kenneth Wilson Fernald
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sulzer Intermedics Inc., Kenneth Wilson Fernald filed Critical Sulzer Intermedics Inc.
Publication of CA2204163A1 publication Critical patent/CA2204163A1/en
Application granted granted Critical
Publication of CA2204163C publication Critical patent/CA2204163C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/372—Arrangements in connection with the implantation of stimulators
    • A61N1/37211—Means for communicating with stimulators
    • A61N1/37252—Details of algorithms or data aspects of communication system, e.g. handshaking, transmitting specific data or segmenting data
    • A61N1/3727—Details of algorithms or data aspects of communication system, e.g. handshaking, transmitting specific data or segmenting data characterised by the modulation technique
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G01R25/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
    • H04L7/0331—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop with a digital phase-locked loop [PLL] processing binary samples, e.g. add/subtract logic for correction of receiver clock
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S128/00—Surgery
    • Y10S128/903—Radio telemetry

Abstract

A method and apparatus is disclosed for use in an implantable device that communicates with an external device through pulse position modulation. A
timing generator is provided as part of said implantable device that determines the phase uncertainty between an external signal and an internal clock signal. The phase uncertainty then is added to the preset delay period to more precisely control the position of the response. The phase uncertainty is measured by a dual slope circuit that varies a state variable (which can be a digital timer, a capacitor voltage, or the like) at a fixed rate with either a positive or negative slope. When the external signal is detected, the state variable is reset and then decreased at a fixed rate until the next positive edge of the clock signal. The state variable then is increased at the same rate until the subsequent positive clock edge. The resulting variable value is proportional to the phase uncertainty. When the delay timer reaches zero, the state variable is again decreased at the same fixed rate until the initial value is reached, at which the output response is generated.
CA002204163A 1994-11-01 1995-10-31 Method and apparatus for improving the resolution of pulse position modulated communications between an implantable medical device and an external medical device Expired - Fee Related CA2204163C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/333,163 US5522866A (en) 1994-11-01 1994-11-01 Method and apparatus for improving the resolution of pulse position modulated communications between an implantable medical device and an external medical device
US08/333,163 1994-11-01
PCT/US1995/014216 WO1996013919A1 (en) 1994-11-01 1995-10-31 Method and apparatus for synchronizing ppm communications between an implantable device and an external device

Publications (2)

Publication Number Publication Date
CA2204163A1 true CA2204163A1 (en) 1996-05-09
CA2204163C CA2204163C (en) 2001-06-19

Family

ID=23301592

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002204163A Expired - Fee Related CA2204163C (en) 1994-11-01 1995-10-31 Method and apparatus for improving the resolution of pulse position modulated communications between an implantable medical device and an external medical device

Country Status (5)

Country Link
US (2) US5522866A (en)
EP (1) EP0789959A1 (en)
JP (1) JPH10508446A (en)
CA (1) CA2204163C (en)
WO (1) WO1996013919A1 (en)

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Also Published As

Publication number Publication date
US5522866A (en) 1996-06-04
US5626625A (en) 1997-05-06
WO1996013919A1 (en) 1996-05-09
JPH10508446A (en) 1998-08-18
EP0789959A1 (en) 1997-08-20
CA2204163C (en) 2001-06-19

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