CA2289715A1 - External blood pressure sensor apparatus and method - Google Patents

External blood pressure sensor apparatus and method Download PDF

Info

Publication number
CA2289715A1
CA2289715A1 CA002289715A CA2289715A CA2289715A1 CA 2289715 A1 CA2289715 A1 CA 2289715A1 CA 002289715 A CA002289715 A CA 002289715A CA 2289715 A CA2289715 A CA 2289715A CA 2289715 A1 CA2289715 A1 CA 2289715A1
Authority
CA
Canada
Prior art keywords
inflatable chamber
blood pressure
pressure sensor
pressure
sensor apparatus
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
CA002289715A
Other languages
French (fr)
Other versions
CA2289715C (en
Inventor
Paul S. Freed
Adrian Kantrowitz
Paul G. Dedecker
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.)
L Vad Technology Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2289715A1 publication Critical patent/CA2289715A1/en
Application granted granted Critical
Publication of CA2289715C publication Critical patent/CA2289715C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • A61B5/346—Analysis of electrocardiograms
    • A61B5/349—Detecting specific parameters of the electrocardiograph cycle
    • A61B5/352—Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/0215—Measuring pressure in heart or blood vessels by means inserted into the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/10—Location thereof with respect to the patient's body
    • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
    • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
    • A61M60/135—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel inside a blood vessel, e.g. using grafting
    • A61M60/139—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel inside a blood vessel, e.g. using grafting inside the aorta, e.g. intra-aortic balloon pumps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/20—Type thereof
    • A61M60/289—Devices for mechanical circulatory actuation assisting the residual heart function by means mechanically acting upon the patient's native heart or blood vessel structure, e.g. direct cardiac compression [DCC] devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/20—Type thereof
    • A61M60/295—Balloon pumps for circulatory assistance
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/40—Details relating to driving
    • A61M60/465—Details relating to driving for devices for mechanical circulatory actuation
    • A61M60/468—Details relating to driving for devices for mechanical circulatory actuation the force acting on the actuation means being hydraulic or pneumatic
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/40—Details relating to driving
    • A61M60/497—Details relating to driving for balloon pumps for circulatory assistance
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/50—Details relating to control
    • A61M60/508—Electronic control means, e.g. for feedback regulation
    • A61M60/515—Regulation using real-time patient data
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/50—Details relating to control
    • A61M60/508—Electronic control means, e.g. for feedback regulation
    • A61M60/515—Regulation using real-time patient data
    • A61M60/531—Regulation using real-time patient data using blood pressure data, e.g. from blood pressure sensors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/50—Details relating to control
    • A61M60/508—Electronic control means, e.g. for feedback regulation
    • A61M60/562—Electronic control means, e.g. for feedback regulation for making blood flow pulsatile in blood pumps that do not intrinsically create pulsatile flow
    • A61M60/569—Electronic control means, e.g. for feedback regulation for making blood flow pulsatile in blood pumps that do not intrinsically create pulsatile flow synchronous with the native heart beat
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/80—Constructional details other than related to driving
    • A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
    • A61M60/857—Implantable blood tubes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/80—Constructional details other than related to driving
    • A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
    • A61M60/861—Connections or anchorings for connecting or anchoring pumps or pumping devices to parts of the patient's body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/80—Constructional details other than related to driving
    • A61M60/855—Constructional details other than related to driving of implantable pumps or pumping devices
    • A61M60/871—Energy supply devices; Converters therefor
    • A61M60/88—Percutaneous cables
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/10—Location thereof with respect to the patient's body
    • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
    • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
    • A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/20—Type thereof
    • A61M60/247—Positive displacement blood pumps
    • A61M60/253—Positive displacement blood pumps including a displacement member directly acting on the blood
    • A61M60/268—Positive displacement blood pumps including a displacement member directly acting on the blood the displacement member being flexible, e.g. membranes, diaphragms or bladders
    • A61M60/274—Positive displacement blood pumps including a displacement member directly acting on the blood the displacement member being flexible, e.g. membranes, diaphragms or bladders the inlet and outlet being the same, e.g. para-aortic counter-pulsation blood pumps

Abstract

This invention is an apparatus and method for measuring the blood pressure of a patient with a permanent or temporary cardiac assist device throughout an entire cardiac cycle by partially filling the inflatable chamber (10) of the cardiac assist device operatively disposed with respect to an aorta with pressurized fluid, and using the partially filled chamber (10) as a transducer. An external pressure sensor (36) is located in a drive unit (18) connected to the inflatable chamber (10). The drive unit (18) controls, monitors, and stores the fluid pressure with respect to the inflatable chamber (10). When isolated from a pressurized fluid reservoir (30, 44) the pressure in the inflatable chamber (10) corresponds to the current blood pressure of the patient through the cardiac cycle. The inflatable chamber (10) is preferably defined by a flexible membrane.
CA002289715A 1997-05-15 1997-12-22 External blood pressure sensor apparatus and method Expired - Fee Related CA2289715C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/856,904 US5833619A (en) 1997-05-15 1997-05-15 External blood pressure sensor apparatus and method
US08/856,904 1997-05-15
PCT/US1997/024075 WO1998051210A1 (en) 1997-05-15 1997-12-22 External blood pressure sensor apparatus and method

Publications (2)

Publication Number Publication Date
CA2289715A1 true CA2289715A1 (en) 1998-11-19
CA2289715C CA2289715C (en) 2004-04-27

Family

ID=25324751

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002289715A Expired - Fee Related CA2289715C (en) 1997-05-15 1997-12-22 External blood pressure sensor apparatus and method

Country Status (8)

Country Link
US (1) US5833619A (en)
EP (1) EP1058512B1 (en)
JP (1) JP3452588B2 (en)
AT (1) ATE330535T1 (en)
AU (1) AU740070B2 (en)
CA (1) CA2289715C (en)
DE (1) DE69736203T2 (en)
WO (1) WO1998051210A1 (en)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5843007A (en) * 1996-04-29 1998-12-01 Mcewen; James Allen Apparatus and method for periodically applying a pressure waveform to a limb
US5888242A (en) * 1996-11-01 1999-03-30 Nimbus, Inc. Speed control system for implanted blood pumps
US5833619A (en) * 1997-05-15 1998-11-10 L. Vad Technology, Inc. External blood pressure sensor apparatus and method
AU741646B2 (en) * 1997-09-30 2001-12-06 L. Vad Technology, Inc. Cardiovascular support control system
US6511412B1 (en) 1998-09-30 2003-01-28 L. Vad Technology, Inc. Cardivascular support control system
US6735532B2 (en) 1998-09-30 2004-05-11 L. Vad Technology, Inc. Cardiovascular support control system
US6471633B1 (en) 1999-08-23 2002-10-29 L.Vad Technology, Inc. Mechanical auxillary ventricle blood pump with reduced waist portion
US6447458B1 (en) * 2001-04-25 2002-09-10 Ge Medical Systems Information Technologies, Inc. Method and system of color coding components of central venous and pulmonary artery wedge pressure waveforms
JP3668843B2 (en) * 2001-08-27 2005-07-06 オムロンヘルスケア株式会社 Electronic blood pressure monitor and blood pressure measurement data processing system
US7468050B1 (en) 2002-12-27 2008-12-23 L. Vad Technology, Inc. Long term ambulatory intra-aortic balloon pump
US7374531B1 (en) 2003-06-11 2008-05-20 L. Vad Technology, Inc. Long term ambulatory intra-aortic balloon pump with three dimensional tortuous shape
US8226541B2 (en) * 2003-06-11 2012-07-24 L. Vad Technology, Inc. Methods of making aortic counter pulsation cardiac assist devices with three dimensional tortuous shape
US7976452B2 (en) * 2003-06-11 2011-07-12 L.Vad Technology, Inc. Long term ambulatory intro-aortic balloon pump with percutaneous access device
US7250025B2 (en) * 2003-08-29 2007-07-31 Datascope Investment Corp. Timing of intra-aortic balloon pump therapy
US7771362B2 (en) * 2005-08-01 2010-08-10 Datascope Investment Corp. Calibration of in vivo blood pressure sensors
JP2010503477A (en) * 2006-09-12 2010-02-04 ユニバーシティ オブ フロリダ リサーチ ファンデーション インコーポレーティッド Method and apparatus for identifying tissue types
JP4714194B2 (en) * 2007-08-09 2011-06-29 オムロンヘルスケア株式会社 Blood pressure measurement device
US7892162B1 (en) * 2009-10-22 2011-02-22 Valluvan Jeevanandam Arterial interface
JP5637051B2 (en) * 2011-03-31 2014-12-10 日本ゼオン株式会社 Aortic balloon pumping drive control program and aortic balloon pumping drive
WO2013180286A1 (en) * 2012-05-31 2013-12-05 日本ゼオン株式会社 Timing detection device, timing detection program, iabp driving device, and iabp driving program
CA2993606A1 (en) 2015-07-22 2017-01-26 Viaderm Llc Cardiac assist device
CN105816926B (en) * 2016-05-05 2018-06-15 深圳市尚捷医疗科技有限公司 Heart-assist device
KR102397138B1 (en) * 2017-06-09 2022-05-13 아비오메드, 인크. Determination of cardiac parameters for modulation of blood pump support
ES2822984T3 (en) * 2017-10-20 2021-05-05 Pulsecath B V Catheter Pump System
CN113038985A (en) 2018-09-25 2021-06-25 Tc1有限责任公司 Adaptive speed control algorithm and controller for optimizing flow in a ventricular assist device
AU2020215601A1 (en) 2019-02-01 2021-08-26 Kardiatec SA Pressure unloading left ventricular assist device and methods for assisting a human heart

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4630597A (en) * 1984-04-30 1986-12-23 Adrian Kantrowitz Dynamic aortic patch for thoracic or abdominal implantation
DE3500822A1 (en) * 1985-01-10 1986-07-10 Spiegelberg, Andreas, Dipl.-Ing., 1000 Berlin PRESSURE MEASUREMENT DEVICE
US4741328A (en) * 1985-03-14 1988-05-03 Shlomo Gabbay Means for intraaortic assist and method of positioning a catheter therefor
US4785795A (en) * 1985-07-15 1988-11-22 Abiomed Cardiovascular, Inc. High-frequency intra-arterial cardiac support system
US4809681A (en) * 1986-03-28 1989-03-07 Aisin Seiki Kabushiki Kaisha Electrocardiographic measurement method for controlling an intra-aortic balloon pump
US4781715A (en) * 1986-04-30 1988-11-01 Temple University Of The Commonwealth System Of Higher Education Cardiac prosthesis having integral blood pressure sensor
US4712563A (en) * 1986-05-28 1987-12-15 Baxter Travenol Laboratories, Inc. Method of and apparatus for determining the diastolic and systolic blood pressure of a patient
US4782817A (en) * 1987-05-29 1988-11-08 Abiomed Cardiovascular, Inc. Ventricular support system
US4902272A (en) * 1987-06-17 1990-02-20 Abiomed Cardiovascular, Inc. Intra-arterial cardiac support system
US4888011A (en) * 1988-07-07 1989-12-19 Abiomed, Inc. Artificial heart
US4877035A (en) * 1988-10-12 1989-10-31 Trustees Of The University Of Pennsylvania Measurement of the end-systolic pressure-volume relation using intraaortic balloon occlusion
US5045051A (en) * 1989-03-14 1991-09-03 Abiomed, Inc. Leak detector
US5169379A (en) * 1989-06-14 1992-12-08 L-Vad Technology In-series ventricular assist system and method of controlling same
US5089016A (en) * 1989-06-15 1992-02-18 Abiomed Cardiovascular, Inc. Blood pump
US5048532A (en) * 1989-09-18 1991-09-17 State University Of New York Method and apparatus for measuring blood pressure
DE69101106T2 (en) * 1990-02-09 1994-08-11 Teracor Method and device for regulating the flow of a heart prosthesis with periodic flow.
JP2902040B2 (en) * 1990-03-29 1999-06-07 アイシン精機株式会社 Drive device of balloon pump with arterial pressure sensor
US5573007A (en) * 1994-08-08 1996-11-12 Innerspace, Inc. Gas column pressure monitoring catheters
US5833619A (en) * 1997-05-15 1998-11-10 L. Vad Technology, Inc. External blood pressure sensor apparatus and method

Also Published As

Publication number Publication date
EP1058512A1 (en) 2000-12-13
AU740070B2 (en) 2001-10-25
ATE330535T1 (en) 2006-07-15
CA2289715C (en) 2004-04-27
WO1998051210A1 (en) 1998-11-19
US5833619A (en) 1998-11-10
EP1058512A4 (en) 2005-03-16
DE69736203T2 (en) 2007-05-03
EP1058512B1 (en) 2006-06-21
JP3452588B2 (en) 2003-09-29
AU5724498A (en) 1998-12-08
DE69736203D1 (en) 2006-08-03
JP2000513628A (en) 2000-10-17

Similar Documents

Publication Publication Date Title
CA2289715A1 (en) External blood pressure sensor apparatus and method
US4453537A (en) Apparatus for powering a body implant device
US3878839A (en) Cardiac assist apparatus
US4304225A (en) Control system for body organs
US4321929A (en) Tourniquet
AU1600092A (en) Medical pumping apparatus
JPH0443666B2 (en)
DE69917593D1 (en) CONTROL OF A HEART PACER BY MEANS OF THE HEART VOLUME AND THE SYSTOLIC BLOOD PRESSURE
EP0973439A4 (en) Apparatus and method for non-invasively monitoring a patient's blood pressure
WO1992019843A3 (en) Organ preservation apparatus
CA2375962A1 (en) Heart assist devices, systems and methods
GB1390813A (en) Apparatus for assisting blood circulation
EP0923954A3 (en) Improving blood flow
CA2322626A1 (en) Pressure control system for cardiac assist device
WO2001095293A3 (en) Cardiac phantom
JPH07503160A (en) cardiac assist device
CA2268635A1 (en) Method and apparatus for assisting a heart
WO2007089500A3 (en) Dual-pulsation bi-ventricular assist device
US6296605B1 (en) High-pressure drive system
CN110279570B (en) Air pressure wave therapeutic instrument leg cover jointing equipment
WO2004110516A3 (en) Peri-arterial blood flow booster
CN101953681B (en) Immersible waterproof type electronic sphygmomanometer
CN113990164B (en) Ventricular cavity simulation device and use method and application thereof
JP3766997B2 (en) Medical expansion / contraction drive
JPH0611310B2 (en) Auxiliary ratio setting device

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed