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FR2431296A1 - APPARATUS FOR CONVERTING ANALOG SIGNALS INTO DIGITAL SIGNALS AND ITS APPLICATION TO A HEART STIMULATOR - Google Patents

APPARATUS FOR CONVERTING ANALOG SIGNALS INTO DIGITAL SIGNALS AND ITS APPLICATION TO A HEART STIMULATOR

Info

Publication number
FR2431296A1
FR2431296A1 FR7918562A FR7918562A FR2431296A1 FR 2431296 A1 FR2431296 A1 FR 2431296A1 FR 7918562 A FR7918562 A FR 7918562A FR 7918562 A FR7918562 A FR 7918562A FR 2431296 A1 FR2431296 A1 FR 2431296A1
Authority
FR
France
Prior art keywords
application
signals
converting analog
heart stimulator
digital signals
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
FR7918562A
Other languages
French (fr)
Other versions
FR2431296B1 (en
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.)
Medtronic Inc
Original Assignee
Medtronic Inc
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 Medtronic Inc filed Critical Medtronic Inc
Publication of FR2431296A1 publication Critical patent/FR2431296A1/en
Application granted granted Critical
Publication of FR2431296B1 publication Critical patent/FR2431296B1/fr
Granted 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
    • A61N1/37264—Changing the program; Upgrading firmware
    • 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
    • A61N1/362—Heart stimulators
    • A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential
    • A61N1/368—Heart stimulators controlled by a physiological parameter, e.g. heart potential comprising more than one electrode co-operating with different heart regions
    • 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
    • A61N1/362—Heart stimulators
    • A61N1/37—Monitoring; Protecting
    • 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

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Cardiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Biophysics (AREA)
  • Physiology (AREA)
  • Electrotherapy Devices (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

L'invention concerne un stimulateur 12 implantable et adaptable à modes multiples. Il comporte notamment un micro-processeur et une mémoire dans laquelle sont chargés différents programmes de stimulation. Il comporte également une liaison 15 de transmission avec l'extérieur, par haute fréquence ou par voie acoustique, permettant de passer d'un programme de stimulation à un autre ou de modifier les programmes qui sont en mémoire. L'invention s'applique notamment à des stimulateurs cardiaques.The invention relates to an implantable and adaptable multi-mode stimulator 12. In particular, it comprises a microprocessor and a memory in which various stimulation programs are loaded. It also comprises a transmission link with the outside, by high frequency or by acoustic means, making it possible to switch from one stimulation program to another or to modify the programs which are in memory. The invention applies in particular to cardiac pacemakers.

FR7918562A 1978-07-20 1979-07-18 APPARATUS FOR CONVERTING ANALOG SIGNALS INTO DIGITAL SIGNALS AND ITS APPLICATION TO A HEART STIMULATOR Granted FR2431296A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US92630378A 1978-07-20 1978-07-20

Publications (2)

Publication Number Publication Date
FR2431296A1 true FR2431296A1 (en) 1980-02-15
FR2431296B1 FR2431296B1 (en) 1984-01-06

Family

ID=25453021

Family Applications (2)

Application Number Title Priority Date Filing Date
FR7918562A Granted FR2431296A1 (en) 1978-07-20 1979-07-18 APPARATUS FOR CONVERTING ANALOG SIGNALS INTO DIGITAL SIGNALS AND ITS APPLICATION TO A HEART STIMULATOR
FR8006814A Expired FR2445659B1 (en) 1978-07-20 1980-03-27 APPARATUS FOR CONVERTING ANALOG SIGNALS TO DIGITAL SIGNALS

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR8006814A Expired FR2445659B1 (en) 1978-07-20 1980-03-27 APPARATUS FOR CONVERTING ANALOG SIGNALS TO DIGITAL SIGNALS

Country Status (8)

Country Link
JP (1) JPS5521990A (en)
AU (2) AU536053B2 (en)
DE (2) DE2954642C2 (en)
FR (2) FR2431296A1 (en)
GB (2) GB2079610B (en)
IT (1) IT1118131B (en)
NL (1) NL7905649A (en)
SE (1) SE445176B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2440201A1 (en) * 1978-10-30 1980-05-30 Medtronic Inc Pacemaker for asynchronous arterial and ventricular stimulation - has detector and control circuit picking up heart beats and intervals for oscillator regulation
FR2440745A1 (en) * 1978-11-06 1980-06-06 Medtronic Inc MEDICAL DEVICE PULSE GENERATOR
FR2443844A1 (en) * 1978-11-06 1980-07-11 Medtronic Inc DIGITAL HEART STIMULATOR PULSE GENERATOR
FR2466995A1 (en) * 1979-10-10 1981-04-17 Medtronic Inc STIMULATOR COMPRISING A PULSE DURATION ADJUSTMENT CIRCUIT
FR2471791A1 (en) * 1979-12-12 1981-06-26 Medtronic Inc SYNCHRONOUS CARDIAC STIMULATOR
FR2471789A1 (en) * 1979-12-18 1981-06-26 Cardiofrance Co MULTIPURPOSE IMPLANTABLE CARDIAC STIMULATOR AND METHOD OF USING THE STIMULATOR
FR2494119A1 (en) * 1980-11-14 1982-05-21 Cordis Corp MULTIMODE PROGRAMMABLE CARDIAC STIMULATOR CONTROLLED BY A MICROPROCESSOR
FR2533432A1 (en) * 1982-09-23 1984-03-30 Europ Propulsion METHOD AND DEVICE FOR DETECTING THE HEART RESPONSE TO AN ELECTRIC STIMULUS PULSE
US4846180A (en) * 1986-10-13 1989-07-11 Compagnie Financiere St.-Nicolas Adjustable implantable heart stimulator and method of use

Families Citing this family (97)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2944542A1 (en) * 1978-11-06 1980-05-14 Medtronic Inc DEVICE FOR PROGRAMMING IMPLANTED ELECTRONIC DEVICES, IN PARTICULAR PACER GENERATORS
US4273132A (en) * 1978-11-06 1981-06-16 Medtronic, Inc. Digital cardiac pacemaker with threshold margin check
US4295474A (en) * 1979-10-02 1981-10-20 The Johns Hopkins University Recorder with patient alarm and service request systems suitable for use with automatic implantable defibrillator
US4388927A (en) * 1979-12-13 1983-06-21 American Hospital Supply Corporation Programmable digital cardiac pacer
EP0037737B1 (en) * 1980-04-07 1985-11-13 Medtronic, Inc. Demand pacemaker with output pulse artifact rejection
US4343311A (en) * 1980-04-30 1982-08-10 Medtronic, Inc. Atrial refractory control for R-wave rejection in pacemakers
DE3038856A1 (en) * 1980-10-10 1982-05-27 Siemens AG, 1000 Berlin und 8000 München HEART PACEMAKER
AU541479B2 (en) * 1980-10-14 1985-01-10 Medtronic, Inc. Heart pacemeker with separate a-v intervals for a trial synchronous and atrial-ventricular sequential pacing modes
FR2492262B1 (en) * 1980-10-16 1987-02-20 Ela Medical Sa METHOD AND DEVICE FOR CONTROLLING AN APPARATUS OR INSTRUMENT, IN PARTICULAR AN IMPLANTABLE HEART STIMULATOR
FR2492552A1 (en) * 1980-10-16 1982-04-23 Ela Medical Sa CONTROL DEVICE FOR AN IMPLANTABLE MEDICAL INSTRUMENT SUCH AS A HEART STIMULATOR AND HEART STIMULATOR COMPRISING THIS DEVICE
DE3153780C2 (en) * 1980-10-16 2003-04-03 Ela Medical Sa Implantable cardiac pacemaker control system
US4374382A (en) * 1981-01-16 1983-02-15 Medtronic, Inc. Marker channel telemetry system for a medical device
US4363325A (en) * 1981-01-19 1982-12-14 Medtronic, Inc. Mode adaptive pacer
EP0058603B1 (en) * 1981-02-17 1986-04-23 Medtronic, Inc. Implantable medical device power source depletion indicators
US4407288B1 (en) * 1981-02-18 2000-09-19 Mieczyslaw Mirowski Implantable heart stimulator and stimulation method
EP0077808B1 (en) * 1981-05-04 1987-08-26 BIOTRONIK Mess- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin Pacemaker
WO1982003780A1 (en) * 1981-05-04 1982-11-11 Nettelhorst Herwig Pacemaker
DE3277362D1 (en) * 1981-05-04 1987-10-29 Biotronik Mess & Therapieg Pacemaker
WO1982003781A1 (en) * 1981-05-04 1982-11-11 Nettelhorst Herwig Pacemaker
WO1982003786A1 (en) * 1981-05-04 1982-11-11 Nettelhorst Herwig Pacemaker
DE3278419D1 (en) * 1981-05-04 1988-06-09 Biotronik Mess & Therapieg Cardiac pacemaker
US4404972B1 (en) * 1981-05-18 2000-07-11 Intermedics Inc Implantable device with microprocessor control
US4390022A (en) * 1981-05-18 1983-06-28 Intermedics, Inc. Implantable device with microprocessor control
DE3127597A1 (en) * 1981-07-13 1983-02-17 Siemens AG, 1000 Berlin und 8000 München METHOD AND PACEMAKER FOR BIFOCAL STIMULATION OF THE HEART
US4561444A (en) * 1981-08-10 1985-12-31 Cordis Corporation Implantable cardiac pacer having dual frequency programming and bipolar/linipolar lead programmability
DE3175940D1 (en) * 1981-10-26 1987-04-09 Vitafin Nv Programmable cardiac pacemaker
EP0077844B1 (en) * 1981-10-26 1987-01-21 Vitafin N.V. Pacemaker utilizing microprocessor dma for generating output pulse sequences
DE3207006A1 (en) * 1982-02-26 1983-09-08 Siemens AG, 1000 Berlin und 8000 München AV SEQUENTIAL HEART PACEMAKER
AU1573183A (en) * 1982-06-18 1983-12-22 Biostim Inc. Biological electrical stimulators
US4562841A (en) * 1982-08-05 1986-01-07 Cardiac Pacemakers, Inc. Programmable multi-mode cardiac pacemaker
US4467810A (en) * 1982-09-30 1984-08-28 Cordis Corporation Multi-mode microprocessor-based programmable cardiac pacer
US4558702A (en) * 1983-01-21 1985-12-17 Cordis Corporation Cardiac pacer having input/output circuit programmable for use with unipolar and bipolar pacer leads
US4665919A (en) * 1983-03-14 1987-05-19 Vitafin N.V. Pacemaker with switchable circuits and method of operation of same
FR2544988B1 (en) * 1983-04-29 1986-10-10 Ela Medical Sa AURICULO-VENTRICULAR CARDIAC STIMULATOR
US4549548A (en) * 1983-09-14 1985-10-29 Vitafin N.V. Pacemaker system with automatic event-programmed switching between unipolar and bipolar operation
US4577634A (en) * 1983-11-22 1986-03-25 Gessman Lawrence J Method and apparatus for alleviating paroxysmal atrail tachycardia
US4543963A (en) * 1983-11-22 1985-10-01 Gessman Lawrence J Method and apparatus for differentiating antegrade from retrograde P-waves and for preventing pacemaker generated tachycardia
US4559947A (en) * 1984-01-27 1985-12-24 Renger Herman L Cardiac tissue stimulator providing P-wave verification, telemetry, marker channels, and antitachycardia capabilities
DE3483882D1 (en) * 1984-02-07 1991-02-07 Schiapparelli Medtronic S P A HEART PACEMAKER, DEPENDING ON THE BREATHABILITY PER TIME UNIT.
FR2561526A1 (en) * 1984-03-22 1985-09-27 Chaptal Paul Cardiac stimulation method and cardiac stimulator for implementing the method
US4585004A (en) * 1984-06-01 1986-04-29 Cardiac Control Systems, Inc. Heart pacing and intracardiac electrogram monitoring system and associated method
US4587970A (en) * 1985-01-22 1986-05-13 Telectronics N.V. Tachycardia reversion pacer
DE3688577D1 (en) * 1985-09-17 1993-07-22 Biotronik Mess & Therapieg HEART PACEMAKER.
EP0215729B1 (en) * 1985-09-17 1992-12-02 BIOTRONIK Mess- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin Heart stimulator
EP0216725B1 (en) * 1985-09-17 1993-12-01 BIOTRONIK Mess- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin Pacemaker
EP0215731B1 (en) * 1985-09-17 1992-12-30 BIOTRONIK Mess- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin Heart stimulator
US4803987A (en) * 1986-06-11 1989-02-14 Intermedics, Inc. Temperature responsive controller for cardiac pacer
DE3780374D1 (en) * 1986-07-31 1992-08-20 Irnich Werner FREQUENCY ADAPTING HEART PACEMAKER.
DE3852893D1 (en) * 1987-11-13 1995-03-09 Biotronik Mess & Therapieg HEART PACEMAKER.
US4899750A (en) * 1988-04-19 1990-02-13 Siemens-Pacesetter, Inc. Lead impedance scanning system for pacemakers
AU614118B2 (en) * 1988-04-19 1991-08-22 Pacesetter Ab Configuration programming of an implantable pacemaker
DE58907785D1 (en) * 1989-03-13 1994-07-07 Siemens Ag Implantable medical device for stimulating a physiological process of a living being with stimulation intensity that can be adapted to the physical activity of the living being.
US5031616A (en) * 1989-12-07 1991-07-16 Siemens-Pacesetter, Inc. Implantable stimulation device having means for self-regulating curent drain usage at battery depletion
US5058581A (en) * 1990-02-20 1991-10-22 Siemens-Pacesetter, Inc. Telemetry apparatus and method for implantable tissue stimulator
US5052389A (en) * 1990-07-26 1991-10-01 Cook Pacemaker Corporation Low-power A/D converter for an implantable medical device and method of use
DE4339304B4 (en) * 1993-11-18 2005-09-15 Robert Bosch Gmbh Circuit arrangement with a transmission element
US5725559A (en) * 1996-05-16 1998-03-10 Intermedics Inc. Programmably upgradable implantable medical device
SE9602846D0 (en) * 1996-07-23 1996-07-23 Pacesetter Ab A stimulation device
DE19724053A1 (en) * 1997-06-07 1998-12-10 Biotronik Mess & Therapieg Electronic storage device, in particular for use in implantable medical devices
FR2772622B1 (en) * 1997-12-23 2000-03-31 Ela Medical Sa ACTIVE CONFIGURABLE IMPLANTABLE MEDICAL DEVICE, IN PARTICULAR CARDIAC STIMULATOR, DEFIBRILLATOR AND / OR CARDIOVERVER
US9050469B1 (en) 2003-11-26 2015-06-09 Flint Hills Scientific, Llc Method and system for logging quantitative seizure information and assessing efficacy of therapy using cardiac signals
DE102004019391A1 (en) * 2004-04-19 2005-11-03 Endress + Hauser Gmbh + Co. Kg Parameterizable electronic device
US9314633B2 (en) 2008-01-25 2016-04-19 Cyberonics, Inc. Contingent cardio-protection for epilepsy patients
US8565867B2 (en) 2005-01-28 2013-10-22 Cyberonics, Inc. Changeable electrode polarity stimulation by an implantable medical device
US8260426B2 (en) 2008-01-25 2012-09-04 Cyberonics, Inc. Method, apparatus and system for bipolar charge utilization during stimulation by an implantable medical device
US8700163B2 (en) 2005-03-04 2014-04-15 Cyberonics, Inc. Cranial nerve stimulation for treatment of substance addiction
US7711419B2 (en) 2005-07-13 2010-05-04 Cyberonics, Inc. Neurostimulator with reduced size
US7840280B2 (en) 2005-07-27 2010-11-23 Cyberonics, Inc. Cranial nerve stimulation to treat a vocal cord disorder
US7489561B2 (en) 2005-10-24 2009-02-10 Cyberonics, Inc. Implantable medical device with reconfigurable non-volatile program
US7996079B2 (en) 2006-01-24 2011-08-09 Cyberonics, Inc. Input response override for an implantable medical device
CA2653110C (en) 2006-03-29 2018-07-31 Catholic Healthcare West Microburst electrical stimulation of cranial nerves for the treatment of medical conditions
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US7974701B2 (en) 2007-04-27 2011-07-05 Cyberonics, Inc. Dosing limitation for an implantable medical device
US8337404B2 (en) 2010-10-01 2012-12-25 Flint Hills Scientific, Llc Detecting, quantifying, and/or classifying seizures using multimodal data
US8571643B2 (en) 2010-09-16 2013-10-29 Flint Hills Scientific, Llc Detecting or validating a detection of a state change from a template of heart rate derivative shape or heart beat wave complex
US8382667B2 (en) 2010-10-01 2013-02-26 Flint Hills Scientific, Llc Detecting, quantifying, and/or classifying seizures using multimodal data
US8204603B2 (en) 2008-04-25 2012-06-19 Cyberonics, Inc. Blocking exogenous action potentials by an implantable medical device
US8457747B2 (en) 2008-10-20 2013-06-04 Cyberonics, Inc. Neurostimulation with signal duration determined by a cardiac cycle
US8417344B2 (en) 2008-10-24 2013-04-09 Cyberonics, Inc. Dynamic cranial nerve stimulation based on brain state determination from cardiac data
US20100191304A1 (en) 2009-01-23 2010-07-29 Scott Timothy L Implantable Medical Device for Providing Chronic Condition Therapy and Acute Condition Therapy Using Vagus Nerve Stimulation
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US8649871B2 (en) 2010-04-29 2014-02-11 Cyberonics, Inc. Validity test adaptive constraint modification for cardiac data used for detection of state changes
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US8679009B2 (en) 2010-06-15 2014-03-25 Flint Hills Scientific, Llc Systems approach to comorbidity assessment
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US9504390B2 (en) 2011-03-04 2016-11-29 Globalfoundries Inc. Detecting, assessing and managing a risk of death in epilepsy
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US3825015A (en) * 1972-12-14 1974-07-23 American Optical Corp Single catheter for atrial and ventricular stimulation
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DE2861544D1 (en) * 1977-08-19 1982-03-04 Biotronik Mess & Therapieg Demand pacer with programmable rate hysteresis
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2440201A1 (en) * 1978-10-30 1980-05-30 Medtronic Inc Pacemaker for asynchronous arterial and ventricular stimulation - has detector and control circuit picking up heart beats and intervals for oscillator regulation
FR2440745A1 (en) * 1978-11-06 1980-06-06 Medtronic Inc MEDICAL DEVICE PULSE GENERATOR
FR2443844A1 (en) * 1978-11-06 1980-07-11 Medtronic Inc DIGITAL HEART STIMULATOR PULSE GENERATOR
FR2466995A1 (en) * 1979-10-10 1981-04-17 Medtronic Inc STIMULATOR COMPRISING A PULSE DURATION ADJUSTMENT CIRCUIT
FR2471791A1 (en) * 1979-12-12 1981-06-26 Medtronic Inc SYNCHRONOUS CARDIAC STIMULATOR
FR2471789A1 (en) * 1979-12-18 1981-06-26 Cardiofrance Co MULTIPURPOSE IMPLANTABLE CARDIAC STIMULATOR AND METHOD OF USING THE STIMULATOR
FR2494119A1 (en) * 1980-11-14 1982-05-21 Cordis Corp MULTIMODE PROGRAMMABLE CARDIAC STIMULATOR CONTROLLED BY A MICROPROCESSOR
FR2533432A1 (en) * 1982-09-23 1984-03-30 Europ Propulsion METHOD AND DEVICE FOR DETECTING THE HEART RESPONSE TO AN ELECTRIC STIMULUS PULSE
EP0105784A1 (en) * 1982-09-23 1984-04-18 SOCIETE EUROPEENNE DE PROPULSION (S.E.P.) Société Anonyme dite: Method and apparatus for detecting the response of the heart to an electrical stimulating pulse
US4846180A (en) * 1986-10-13 1989-07-11 Compagnie Financiere St.-Nicolas Adjustable implantable heart stimulator and method of use

Also Published As

Publication number Publication date
IT7949768A0 (en) 1979-07-16
GB2079610A (en) 1982-01-27
SE7906205L (en) 1980-01-21
NL7905649A (en) 1980-01-22
DE2929498A1 (en) 1980-01-31
SE445176B (en) 1986-06-09
AU3271384A (en) 1984-12-20
GB2026870A (en) 1980-02-13
GB2026870B (en) 1982-12-15
DE2954642C2 (en) 1991-11-07
DE2929498C2 (en) 1991-07-11
AU584310B2 (en) 1989-05-25
JPS6241032B2 (en) 1987-09-01
JPS5521990A (en) 1980-02-16
AU536053B2 (en) 1984-04-19
GB2079610B (en) 1983-04-07
FR2445659B1 (en) 1985-11-29
AU4898979A (en) 1980-01-24
IT1118131B (en) 1986-02-24
FR2445659A1 (en) 1980-07-25
FR2431296B1 (en) 1984-01-06

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