CA2184423A1 - Process control system - Google Patents

Process control system

Info

Publication number
CA2184423A1
CA2184423A1 CA002184423A CA2184423A CA2184423A1 CA 2184423 A1 CA2184423 A1 CA 2184423A1 CA 002184423 A CA002184423 A CA 002184423A CA 2184423 A CA2184423 A CA 2184423A CA 2184423 A1 CA2184423 A1 CA 2184423A1
Authority
CA
Canada
Prior art keywords
control
present
control circuitry
pressure
hysteresis
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
CA002184423A
Other languages
French (fr)
Other versions
CA2184423C (en
Inventor
Christopher C. Jung
Douglas E. Wallace, Jr.
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.)
Alcon Vision LLC
Original Assignee
Alcon Laboratories 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 Alcon Laboratories Inc filed Critical Alcon Laboratories Inc
Publication of CA2184423A1 publication Critical patent/CA2184423A1/en
Application granted granted Critical
Publication of CA2184423C publication Critical patent/CA2184423C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00—Automatic controllers
    • G05B11/01—Automatic controllers electric
    • G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
    • G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
    • 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
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/71—Suction drainage systems
    • A61M1/74—Suction control
    • A61M1/743—Suction control by changing the cross-section of the line, e.g. flow regulating valves
    • 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
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/80—Suction pumps
    • A61M1/804—Suction pumps using Laval or Venturi jet pumps
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • G05D16/202—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means actuated by an electric motor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/007—Methods or devices for eye surgery
    • A61F9/00736—Instruments for removal of intra-ocular material or intra-ocular injection, e.g. cataract instruments
    • 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
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3331—Pressure; Flow
    • 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
    • A61M2210/00—Anatomical parts of the body
    • A61M2210/06—Head
    • A61M2210/0612—Eyes

Abstract

A process control system according to the present invention uses analog control circuitry in which a differential amplifier stage is incorporated into the feedback path rather that the feedforward path to enable the control of highly non-linear processes that may also exhibit high levels of hysteresis. Such processes often have superior performance characteristics that conventional control circuitry cannot exploit. The present invention additionally incorporates an automatic control circuit which varies the gain of various stages the control circuitry when the output of the process is within a predetermined range. An embodiment of the present invention is used to control anonlinear proportional valve with severe hysteresis. The valve regulates the pressure within pressure-driven ophthalmic surgical instruments, which must be controlledextremely precisely to enable successful eye surgery.
CA002184423A 1995-10-25 1996-08-29 Process control system Expired - Lifetime CA2184423C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US548,126 1995-10-25
US08/548,126 US5674194A (en) 1995-10-25 1995-10-25 Process control system

Publications (2)

Publication Number Publication Date
CA2184423A1 true CA2184423A1 (en) 1997-04-26
CA2184423C CA2184423C (en) 2003-03-18

Family

ID=24187532

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002184423A Expired - Lifetime CA2184423C (en) 1995-10-25 1996-08-29 Process control system

Country Status (8)

Country Link
US (1) US5674194A (en)
EP (1) EP0770940B1 (en)
JP (1) JP3160539B2 (en)
AT (1) ATE164955T1 (en)
AU (1) AU699515B2 (en)
CA (1) CA2184423C (en)
DE (1) DE69600227T2 (en)
ES (1) ES2115413T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110074916A (en) * 2019-06-15 2019-08-02 吉林大学 Balance adjustment eye pressure device under a kind of high pressure conditions

Families Citing this family (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5967820A (en) * 1998-04-07 1999-10-19 Ditto Sales, Inc. Electrical system for use with ganged furniture
US6290690B1 (en) 1999-06-21 2001-09-18 Alcon Manufacturing, Ltd. Simultaneous injection and aspiration of viscous fluids in a surgical system
US6514268B2 (en) 1999-08-30 2003-02-04 Alcon Universal Ltd. Method of operating microsurgical instruments
US6743245B2 (en) 1999-12-20 2004-06-01 Alcon Universal Ltd. Asynchronous method of operating microsurgical instruments
US7470277B2 (en) * 2001-10-16 2008-12-30 Alcon, Inc. Simultaneous proportional control of surgical parameters in a microsurgical system
US7232506B2 (en) * 2003-10-08 2007-06-19 Deposition Sciences, Inc. System and method for feedforward control in thin film coating processes
US7604615B2 (en) * 2006-03-20 2009-10-20 Alcon, Inc. Surgical cassette with bubble separating structure
US20070005030A1 (en) * 2005-06-21 2007-01-04 Hopkins Mark A Aspiration control via flow or impedance
EP1757317A1 (en) * 2005-08-25 2007-02-28 Ohio Medical Corporation Compensating venturi vacuum system
US7600405B2 (en) * 2005-10-11 2009-10-13 Alcon, Inc. Microsurgical probe
US20070185514A1 (en) * 2006-02-06 2007-08-09 Kirchhevel G L Microsurgical instrument
US8187293B2 (en) * 2006-02-06 2012-05-29 Novartis Ag Microsurgical instrument
US8465467B2 (en) 2006-09-14 2013-06-18 Novartis Ag Method of controlling an irrigation/aspiration system
US8679241B2 (en) 2006-10-30 2014-03-25 Novartis Ag Gas pressure monitor for pneumatic surgical machine
US8038692B2 (en) 2006-10-31 2011-10-18 Novartis Ag Modular design for ophthalmic surgical probe
US8162000B2 (en) * 2006-12-13 2012-04-24 Novartis Ag Adjustable pneumatic system for a surgical machine
US9241830B2 (en) * 2006-12-15 2016-01-26 Novartis Ag Pressure monitor for pneumatic vitrectomy machine
US8312800B2 (en) * 2006-12-21 2012-11-20 Novartis Ag Pneumatic system for a vitrector
WO2008079526A2 (en) * 2006-12-22 2008-07-03 Alcon Research, Ltd. Method of operating a microsurgical instrument
US20080172078A1 (en) * 2007-01-16 2008-07-17 Svetic Ralph E Reduced traction vitrectomy probe
US20090018488A1 (en) * 2007-07-09 2009-01-15 Davis Sherman G Method of Priming a Surgical System
US8080029B2 (en) * 2007-09-21 2011-12-20 Novartis Ag System for actuation of a vitreous cutter
US9314553B2 (en) * 2008-01-10 2016-04-19 Alcon Research, Ltd. Surgical system
US20100312169A1 (en) * 2009-06-03 2010-12-09 Auld Jack R Method of operating a vitrectomy probe
CA2770487C (en) * 2009-08-31 2018-01-09 Jiansheng Zhou Pneumatic pressure output control by drive valve duty cycle calibration
RU2556529C2 (en) 2009-12-10 2015-07-10 Алькон Рисерч, Лтд. System and methods for dynamic actuator of pneumatically operated valve
US8666556B2 (en) * 2009-12-10 2014-03-04 Alcon Research, Ltd. Systems and methods for dynamic feedforward
US8298253B2 (en) 2010-05-27 2012-10-30 Alcon Research, Ltd. Variable drive vitrectomy cutter
US8821524B2 (en) 2010-05-27 2014-09-02 Alcon Research, Ltd. Feedback control of on/off pneumatic actuators
US8689439B2 (en) 2010-08-06 2014-04-08 Abbott Laboratories Method for forming a tube for use with a pump delivery system
US8377000B2 (en) 2010-10-01 2013-02-19 Abbott Laboratories Enteral feeding apparatus having a feeding set
US8377001B2 (en) 2010-10-01 2013-02-19 Abbott Laboratories Feeding set for a peristaltic pump system
US9101442B2 (en) 2010-12-15 2015-08-11 Alcon Research, Ltd. Reduced friction vitrectomy probe
US8808318B2 (en) 2011-02-28 2014-08-19 Alcon Research, Ltd. Surgical probe with increased fluid flow
US9060841B2 (en) 2011-08-31 2015-06-23 Alcon Research, Ltd. Enhanced flow vitrectomy probe
US10070990B2 (en) 2011-12-08 2018-09-11 Alcon Research, Ltd. Optimized pneumatic drive lines
NL2009424C2 (en) 2012-09-06 2014-03-10 D O R C Dutch Ophthalmic Res Ct International B V Irrigation/aspiration system, cartridge, pump unit, surgical machine, method for controlling.
US9132229B2 (en) 2012-09-13 2015-09-15 Alcon Research, Ltd. System and method of priming a surgical cassette
US9498378B2 (en) 2014-04-04 2016-11-22 Novartis Ag Minimal pulsation ophthalmic probe
CN105739307B (en) * 2016-01-29 2018-08-07 浙江大学 The stagnant ring compensation device of proportional pressure-reducing valve based on adaptive robust control and method
WO2018073727A1 (en) 2016-10-19 2018-04-26 Novartis Ag Apparatus for controlling vacuum during ocular surgery
NL2019884B1 (en) 2017-11-10 2019-05-17 Crea Ip B V Pressure control unit for an ophthalmic surgical system
CN114980846A (en) * 2020-01-14 2022-08-30 爱尔康公司 Vacuum oscillation prevention in a venturi surgical system
US11934209B2 (en) 2020-09-14 2024-03-19 Alcon Inc. Methods and systems for providing control stability in a vacuum generation system using an override proportional-integral-derivative (PID) controller
EP4210777A1 (en) * 2020-09-14 2023-07-19 Alcon Inc. Methods and systems for providing control stability in a vacuum generation system using cascade proportional-integral-derivative (pid) controller

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4088938A (en) * 1976-12-17 1978-05-09 Vapor Corporation Electronic apparatus for positioning and using AC motors
US4274411A (en) * 1979-03-30 1981-06-23 Dotson Robert S Jun Fluid operated ophthalmic irrigation and aspiration device
US4395258A (en) * 1980-11-03 1983-07-26 Cooper Medical Devices Linear intra-ocular suction device
US4757814A (en) * 1985-02-28 1988-07-19 Alcon Laboratories, Inc. Proportional control for pneumatic cutting device
US4706687A (en) * 1985-02-28 1987-11-17 Alcon Instrumentation, Inc. Linear suction control system
US4733149A (en) * 1985-05-31 1988-03-22 Kollmorgen Technologies Corporation Adaptive control system
US4622503A (en) * 1985-09-26 1986-11-11 Medical Instrument Development Laboratories, Inc. Variable pneumatic output means for use with ophthalmic micro-surgical instruments
US4770654A (en) * 1985-09-26 1988-09-13 Alcon Laboratories Inc. Multimedia apparatus for driving powered surgical instruments
US4705067A (en) * 1986-05-13 1987-11-10 Coffee Curtis L Electric-to-pressure transducer
US5017089A (en) * 1989-04-11 1991-05-21 United Technologies Corporation Propeller speed governor having a derivative inhibit at high flight speeds
US5094260A (en) * 1990-10-26 1992-03-10 Alcon Surgical, Inc. Proportional valve and pressure control system
US5097744A (en) * 1991-01-14 1992-03-24 General Electric Company Hydraulic control system
US5354268A (en) * 1992-11-04 1994-10-11 Medical Instrument Development Laboratories, Inc. Methods and apparatus for control of vacuum and pressure for surgical procedures
US5380280A (en) * 1993-11-12 1995-01-10 Peterson; Erik W. Aspiration system having pressure-controlled and flow-controlled modes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110074916A (en) * 2019-06-15 2019-08-02 吉林大学 Balance adjustment eye pressure device under a kind of high pressure conditions
CN110074916B (en) * 2019-06-15 2024-04-12 吉林大学 Balance adjustment eye pressure device under high pressure state

Also Published As

Publication number Publication date
DE69600227D1 (en) 1998-05-14
AU6440096A (en) 1997-05-01
EP0770940A1 (en) 1997-05-02
AU699515B2 (en) 1998-12-03
JPH09171401A (en) 1997-06-30
ATE164955T1 (en) 1998-04-15
EP0770940B1 (en) 1998-04-08
ES2115413T3 (en) 1998-06-16
JP3160539B2 (en) 2001-04-25
DE69600227T2 (en) 1998-09-10
CA2184423C (en) 2003-03-18
US5674194A (en) 1997-10-07

Similar Documents

Publication Publication Date Title
CA2184423A1 (en) Process control system
EP0481492A3 (en) Feedback control apparatus and method
DE69430257T2 (en) INTRASTROMAL, CORNAL RING FOR ASTIGMATISM CORRECTION
CA2308541A1 (en) Model-free adaptive process control
CA2177144A1 (en) Percutaneous prosthetic graft
WO1997048026A3 (en) A method for surveying the condition of a control valve, and a valve apparatus
CA2274643A1 (en) Aqueous dispersions of crystalline polymers and uses
EP2267133A3 (en) Method for making poly(3-hydroxyproprionate)
AU4847793A (en) Astigmatic correcting intrastromal corneal ring
WO1996036806A3 (en) Canister purge system having improved purge valve control
CA2124887A1 (en) Automatic gain control apparatus
EP0849295A3 (en) Nonionic aqueous polyurethane dispersions and processes for making same
CA2199861A1 (en) Universal on/off solenoid valve assembly
CA2189712A1 (en) Variable Gain Amplifying Device
JPH02292585A (en) Control electronic device for electrically controllable control valve
AU2002216951A1 (en) Aqueous dispersion of addition polymer particles
WO2002095938A3 (en) Db-linear variable gain amplifier (vga)stage with a high broad band
EP0416368A3 (en) Adaptive controller
AU7049296A (en) Stabilization of non-halogenated 3-isothiazolones in aggressive systems
WO1997015845A3 (en) Telescopic sight with variable magnification
EP3772873A1 (en) Color temperature smoothing output system
EP0363870A3 (en) Modified ethylene copolymer
JPS6456275A (en) Solenoid valve controller
GB2331990A (en) Process for preparing an ocular device
Maeda Figure 4. If the relation between it is rising gradually.: pressure is suddenly decreasing, supply voltage to the valve and pressure of chamber is is understand that there is can't control the pressure of non-linear response of the valve. at the setting pressure if rise decrease in don't control learning pressure at several steps. Experimental results are contro Figure 6. control) exit of chamber If compressed air of the chamber bleeds through a millimeter

Legal Events

Date Code Title Description
EEER Examination request
MKEX Expiry

Effective date: 20160829