WO2000027279A1 - fMRI COMPATIBLE ELECTRODE AND ELECTRODE PLACEMENT TECHNIQUES - Google Patents
fMRI COMPATIBLE ELECTRODE AND ELECTRODE PLACEMENT TECHNIQUES Download PDFInfo
- Publication number
- WO2000027279A1 WO2000027279A1 PCT/US1999/026459 US9926459W WO0027279A1 WO 2000027279 A1 WO2000027279 A1 WO 2000027279A1 US 9926459 W US9926459 W US 9926459W WO 0027279 A1 WO0027279 A1 WO 0027279A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- electrode assembly
- electrodes
- signals
- assembly
- Prior art date
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
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/291—Bioelectric electrodes therefor specially adapted for particular uses for electroencephalography [EEG]
Definitions
- the present invention relates to medical devices and more specifically to techniques for acquiring uncontaminated electrical signals from the brain and body, without the use of pre-amplification electronics, especially while located within the harsh operating environment produced by a functional magnetic resonance imaging (fMRI) system.
- fMRI functional magnetic resonance imaging
- EEG, EOG, ECG, EMG, and other physiological signals are typically recorded using individually placed electrodes that are fixed on the scalp and body with adhesives or by the use of a cap type system. Examples of these techniques are those developed by Sams et al (U.S. Pat. No. 4,085,739) or Gevins et al (U.S. Pat. No's 4,967,038 and 5,038,782).
- the electrodes are attached to amplifiers used to acquire and record the related electrical and physiological activity.
- These amplifier systems require a very low impedance contact with the skin and are very susceptible to emissions from other electrical equipment, such as an MRI device.
- EMI electro-magnetic interference
- the problems of the prior art, described above, are solved, in accordance with the present invention, by providing an EEG Electrode Positioning System using an elastic head cap (hereinafter Quik-Cap), to position electrodes on the head and face to acquire electrical signals and communicate them to external amplifier equipment.
- the Quik-Cap provides a stretchable elastic cap and chinstrap portion capable of comfortably fitting a wide range of head size and shape variability.
- the Quik-Cap provides a plurality of electrode holders designed to be filled with a conductive electrolyte.
- the Quik-Cap provides a wire harness assembly that can be configured with either carbon or metal lead wires and is capable of interfacing with any type of commercially available amplifier system.
- the present invention provides a low cost system for rapidly applying large numbers of electrodes on the head and body that is capable of acquiring signals inside an fMRI system and communicating them outside the shielded environment without the use of any electronic amplification.
- Another object of the present invention to use metal electrodes composed of Tin, Gold, Silver-Chlorided Silver, or a combination or amalgam of Silver-Chloride powders, each carried in soft rubber electrode mounts and connected to carbon lead wires to limit the susceptibility of the system to physiological and electronically induced contamination.
- a single electrode, or group of electrodes may also be used to acquire signals from the eyes, heart or muscles, by providing a mechanism to position electrodes in the appropriate regions of the scalp, face, chest or body.
- Still another object of the present invention is to permit a single lead wire, or group of lead wires, to be used to connect to and communicate signals from external transducer devices used to measure signals related to oxygen uptake, respiration, heart rate, impedance, motion, acceleration, force or other such signals.
- Yet another feature of the present invention is to provide separable elastic cap, chinstrap, and wire harness portions to position electrode holders and electrodes on the head, face and body to acquire EEG, EOG, EMG, ECG and other physiologically correlated signals from humans while inside a magnetic resonance imaging system.
- FIG. 1 is a side view of the elastic cap and chinstrap portion of an exemplary embodiment of the present invention showing electrode holders and lead wire harness assembly in which individual lead wires are attached to electrodes (not shown) carried within the electrode holders.
- FIG. 2A is a cross-sectional side view of the electrode holder of FIG. 1.
- FIG. 2B is a top plan view of the embodiment of FIG. 2 A.
- FIG. 2C is a side plan view of the embodiment of FIG. 2 A.
- FIG. 2D is a top-down view of a rubber O-ring used to attach the electrode holder to the elastic cap portion of FIG. 1.
- FIG. 3 A is a cross-sectional side view along line A - A of FIG. 3B of an exemplary electrode carried within the electrode holder of FIG. 2 A.
- FIG. 3B is a top plan view of the embodiment of FIG. 3 A.
- FIG. 3C is a side plan view of the embodiment of FIG. 3 A.
- FIG. 4A is a perspective top view of an alternative embodiment of a cup shaped electrode carried in an exemplary electrode holder of FIG 2A.
- FIG. 4B is a perspective bottom view of an alternative embodiment using a cup shaped electrode carried in the electrode holder of FIG 2 A.
- FIG. 4C is a top-down view of the embodiment of the electrode of
- FIG. 4A is a diagrammatic representation of FIG. 4A.
- FIG. 4D is a side view of the embodiment of the electrode of FIG. 4 A.
- FIG. 4E is a cross-sectional view of an alternative embodiment of a conductive plastic electrode embodiment carried in the electrode holder of FIG. 2A.
- FIG. 4F is a top plan view of the embodiment of the electrode in FIG. 4E.
- FIG.5A is a top plan view of an alternative embodiment of a conductive plastic electrode embodiment carried in the electrode holder of FIG. 2 A.
- FIG. 5B is a cross-sectional side view along line B - B of the embodiment of the conductive plastic electrode of FIG. 5 A.
- FIG.5C is a top plan view of an alternative embodiment of a carbon electrode embodiment carried in the electrode holder of FIG. 2 A.
- FIG. 5D is a cross-sectional side view along line C - C of the embodiment of the carbon electrode of FIG. 5C.
- FIG. 6 is a top plan view of an alternative embodiment of a cortical depth electrode embodiment used with the carbon lead wire harness of the present invention.
- FIG. 7 is a top plan view of an alternative embodiment of a cortical surface grid electrode embodiment used with the carbon lead wire harness of the present invention.
- FIG. 8 is a top plan view of an alternative embodiment of a cortical surface strip electrode embodiment used with the carbon lead wire harness of the present invention.
- the fMRI-compatible electrode placement system of the present invention includes an elastic fabric cap portion 10 and chinstrap portion 11, both composed preferably of a combined Lycra-SpandexTM material such as Style #: 96175 Black-09000, manufactured by Liberty Fabrics, 13441 Liberty Lane, Gordonsville, NA). Attached to the elastic cap portion 10, is a plurality of electrode holders 20a-n.
- the designation "n" means that the number depends on the number of electrodes desired. In typical usage, for example, n may be in the range from 1 to 1024.
- a plurality of lead wires 13 of the present invention form a harness assembly 14.
- the lead wires may be constructed of any non-ferromagnetic conductive material, but are preferably made of carbon.
- the lead wires may be wrapped in groups with flexible wrapping material (not shown), and extend from the electrodes (not shown) carried within the electrode holders 20a-n away from the head, terminating in a connector, such as a CHG-Series 40 pin connector (not shown) manufactured by 3M, Inc.
- the flexible wrapping (not shown) is used to ensure the wires will not be allowed to coil while inside the MRI environment in order to prevent induced heating of the lead wire material.
- the electrode holder 20 is preferably constructed from a single piece of molded medical grade EPDM rubber, such as compound L-5099.
- the electrode holder 20, provides a central hole portion 21, which allows access to the central well portion 22, and which passes down to the scalp surface. Electrolyte is injected through the central hole 21 to fill the central well portion 22 creating a bridge to conduct the electrical signal from the skin surface to the electrode (not shown), which rests on the ridge portion 23 located within the central well portion 22 of the electrode holder 20.
- a hole 24 exists where a lead wire attachment portion of the electrode (not shown) extends from the electrode holder.
- the electrode 30 of the present invention has a flat disk portion 31 with a central hole 32.
- the electrode 30 also includes a lead wire attachment portion 33, which extends outward from the flat disk portion 31 and provides a pathway 34. Such a pathway may be created by drilling or by other mechanisms.
- the drilled pathway 34 provides an opening in which the lead wire 13 passes and is attached to the electrode 30 by crimping the attachment portion 33 onto the lead wire 13.
- an O ring is slipped over the lead wire 13.
- the electrode 30 is inserted into the central well portion 22 of the electrode holder 20 and rests on the ridge portion 23 to ensure correct placement.
- the electrode holder is inserted through a button hole or other opening in the elastic fabric cap and secured by positioning one or more O- rings over the fabric.
- the lead wire 13 is placed into the pathway 34 and the attachment portion 33 is crimped onto the lead wire.
- FIGS. 4A - 4F An alternative embodiment of the preferred electrode of the present invention is shown in FIGS. 4A - 4F, where typical cup shaped electrodes 40 may be composed of metal (such as those manufactured by Specialized Laboratory Equipment, 232 Selsdon Rd.
- Electrode 41 such as those manufactured by Plastics One, 6591 Merriman Rd., S.W., Roanoke, VA, PN: 36562.
- a central hole 43 exists to allow injection of electrolyte down to the skin surface.
- a well portion 44 is provided to hold electrolyte in contact with the electrode surface.
- a central hole 45 exists to allow injection of electrolyte down to the skin surface.
- a well portion 46 is provided to hold electrolyte in contact with the electrode surface. Both types of electrodes 40 and 41, may be readily carried within the electrode holder 20 of the present invention.
- FIGS. 5A - 5D An alternative embodiment of the preferred electrode of the present invention is shown in FIGS. 5A - 5D, where conductive plastic electrodes 50 (such as those manufactured by Select Engineering Inc., 260 Lunenburg St., Fitchburg, MA, PN: SRT-3001/LP/0.06) and carbon electrodes 51 (such as those manufactured by Select Engineering Inc., 260 Lunenburg St., Fitchburg, MA, PN: SRT-2001/CF/40) are shown.
- conductive plastic electrodes 50 such as those manufactured by Select Engineering Inc., 260 Lunenburg St., Fitchburg, MA, PN: SRT-2001/CF/40
- carbon electrodes 51 such as those manufactured by Select Engineering Inc., 260 Lunenburg St., Fitchburg, MA, PN: SRT-2001/CF/40
- a lead wire attachment means 52 exists, which provides a surface where conductive epoxy (such as EPO-TEK E2101) is used to attach the carbon lead wire 13 to the conductive plastic electrode 50.
- conductive epoxy such as EPO-TEK E2101
- a well portion 53 exists to hold electrolyte in contact with the electrode surface.
- the lead wire 13 is attached to the carbon electrode 51 by use of conductive epoxy at the electrode attachment point 54.
- Both the conductive plastic electrode 50 and carbon electrode 51 may be carried within electrode holder 20 of the present invention.
- FIG. 6 An alternative embodiment of the preferred electrode of the present invention is shown in FIG. 6, where an implantible depth electrode assembly 60 (such as those manufactured by AD-Tech Medical Instrument Corp., 1901 William St., Racine, WI, PN: SP-10P) is used.
- the depth electrode assembly 60 of the present embodiment positions 10 discreet electrodes 61a-j in which each acquires signals from a different region of the brain.
- the depth electrode assembly 60 can be placed into the cortex of a patient to collect electrical signals from multiple deep regions of the brain simultaneously.
- the depth electrode assembly 60 would not be carried in the electrode holder 13 of the present invention but rather the lead wire harness assembly 14 directly interfaces to the depth electrode assembly Connection System 62.
- FIG. 7 An alternative embodiment of the preferred electrode of the present invention is shown in FIG. 7, where a subdural cortical surface electrode assembly 70 (such as those manufactured by AD-Tech Medical Instrument Corp., 1901 William St., Racine, WI, PN: T-WS-20) is used.
- the subdural cortical surface electrode assembly 70 of the present embodiment positions 20 discreet electrodes 71a-t in a grid pattern in which each acquires signals from a different region of the brain.
- other subdural cortical surface electrode assemblies exist that provide different numbers of electrodes. Grids with up to 128 discreet electrodes (not shown) are readily available commercially, but other numbers of electrodes may be used.
- the subdural cortical surface electrode assembly 70 can be placed on the cortex of a patient to collect electrical signals from multiple regions of the brain underlying the grid pattern formed by the electrodes of the assembly.
- the subdural cortical surface electrode assembly 70 would not be carried in the electrode holder 13 of the present but rather the lead wire harness assembly 14 would be directly connected to the subdural cortical surface electrode assembly Connection System 72.
- FIG. 8 An alternative embodiment of the preferred electrode of the present invention is shown in FIG. 8, where a subdural cortical surface electrode assembly 80 (such as that manufactured by AD-Tech Medical Instrument Corp., 1901 William St., Racine, WI, PN: T-WS-8) is used.
- the subdural cortical surface electrode assembly 80 of the present embodiment positions 8 discreet electrodes 81a-h in a strip pattern in which each acquires signals from a different region of the brain.
- other subdural cortical surface electrode assemblies are readily available commercially that provide from 1 up to 128 discreet electrodes (not shown).
- the subdural cortical surface electrode assembly 80 can be placed on the cortex of a patient to collect electrical signals from multiple regions of the brain underlying the strip pattern formed by the electrodes of the assembly.
- the subdural cortical surface electrode assembly 80 would not be carried in the electrode holder 13 of the present invention but would be directly connected to the lead wire harness assembly 14 through the assembly Connection System 82.
- each electrode holder is filled with conductive electrolyte. Slight abrasion of the skin may be required during placement to reduce the impedance at the skin electrolyte interface to acceptable levels as determined by the input characteristics of the amplifier system to which the Quik-Cap assembly is attached.
- the problems associated with collection of patient data in the environment of an MRI can be overcome.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2354549A CA2354549C (en) | 1998-11-10 | 1999-11-10 | Fmri compatible electrode and electrode placement techniques |
AU16134/00A AU1613400A (en) | 1998-11-10 | 1999-11-10 | Fmri compatible electrode and electrode placement techniques |
JP2000580517A JP4805456B2 (en) | 1998-11-10 | 1999-11-10 | Electrode and electrode arrangement method suitable for functional magnetic resonance imaging apparatus |
US09/831,687 US6708051B1 (en) | 1998-11-10 | 1999-11-10 | FMRI compatible electrode and electrode placement techniques |
EP99958852A EP1128764A4 (en) | 1998-11-10 | 1999-11-10 | fMRI COMPATIBLE ELECTRODE AND ELECTRODE PLACEMENT TECHNIQUES |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10791898P | 1998-11-10 | 1998-11-10 | |
US60/107,918 | 1998-11-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000027279A1 true WO2000027279A1 (en) | 2000-05-18 |
Family
ID=22319159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/026459 WO2000027279A1 (en) | 1998-11-10 | 1999-11-10 | fMRI COMPATIBLE ELECTRODE AND ELECTRODE PLACEMENT TECHNIQUES |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1128764A4 (en) |
JP (1) | JP4805456B2 (en) |
AU (1) | AU1613400A (en) |
CA (1) | CA2354549C (en) |
WO (1) | WO2000027279A1 (en) |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2370776A (en) * | 2000-09-13 | 2002-07-10 | Neoventa Medical Ab | Non-magnetic fetal scalp electrode |
EP1273922A1 (en) * | 2001-07-06 | 2003-01-08 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Methods and devices for measuring electrical currents |
WO2005048837A1 (en) * | 2003-11-18 | 2005-06-02 | Nexstim Oy | Electrode structure for measuring electrical responses from the human body |
WO2010030225A1 (en) * | 2008-09-09 | 2010-03-18 | Fernando Seoane Martinez | Method and apparatus for brain damage detection |
CN102727194A (en) * | 2012-05-04 | 2012-10-17 | 燕山大学 | Electroencephalogram electrode space positioning system and positioning method |
EP2561806A1 (en) * | 2010-04-21 | 2013-02-27 | Tohoku University | Electroencephalogram electrode unit for small animals and measurement system using same |
US8825180B2 (en) | 2005-03-31 | 2014-09-02 | Medtronic, Inc. | Medical electrical lead with co-radial multi-conductor coil |
US8989840B2 (en) | 2004-03-30 | 2015-03-24 | Medtronic, Inc. | Lead electrode for use in an MRI-safe implantable medical device |
US9044593B2 (en) | 2007-02-14 | 2015-06-02 | Medtronic, Inc. | Discontinuous conductive filler polymer-matrix composites for electromagnetic shielding |
US9155877B2 (en) | 2004-03-30 | 2015-10-13 | Medtronic, Inc. | Lead electrode for use in an MRI-safe implantable medical device |
US9186499B2 (en) | 2009-04-30 | 2015-11-17 | Medtronic, Inc. | Grounding of a shield within an implantable medical lead |
US9259572B2 (en) | 2007-04-25 | 2016-02-16 | Medtronic, Inc. | Lead or lead extension having a conductive body and conductive body contact |
US9302101B2 (en) | 2004-03-30 | 2016-04-05 | Medtronic, Inc. | MRI-safe implantable lead |
US9463317B2 (en) | 2012-04-19 | 2016-10-11 | Medtronic, Inc. | Paired medical lead bodies with braided conductive shields having different physical parameter values |
US9731119B2 (en) | 2008-03-12 | 2017-08-15 | Medtronic, Inc. | System and method for implantable medical device lead shielding |
CN107495964A (en) * | 2017-09-15 | 2017-12-22 | 西安富德医疗电子有限公司 | Disposable medical spiral pin electrode |
US9993638B2 (en) | 2013-12-14 | 2018-06-12 | Medtronic, Inc. | Devices, systems and methods to reduce coupling of a shield and a conductor within an implantable medical lead |
US10084250B2 (en) | 2005-02-01 | 2018-09-25 | Medtronic, Inc. | Extensible implantable medical lead |
US10155111B2 (en) | 2014-07-24 | 2018-12-18 | Medtronic, Inc. | Methods of shielding implantable medical leads and implantable medical lead extensions |
US10279171B2 (en) | 2014-07-23 | 2019-05-07 | Medtronic, Inc. | Methods of shielding implantable medical leads and implantable medical lead extensions |
US10537730B2 (en) | 2007-02-14 | 2020-01-21 | Medtronic, Inc. | Continuous conductive materials for electromagnetic shielding |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8014867B2 (en) | 2004-12-17 | 2011-09-06 | Cardiac Pacemakers, Inc. | MRI operation modes for implantable medical devices |
US8032228B2 (en) | 2007-12-06 | 2011-10-04 | Cardiac Pacemakers, Inc. | Method and apparatus for disconnecting the tip electrode during MRI |
US8086321B2 (en) | 2007-12-06 | 2011-12-27 | Cardiac Pacemakers, Inc. | Selectively connecting the tip electrode during therapy for MRI shielding |
US8311637B2 (en) | 2008-02-11 | 2012-11-13 | Cardiac Pacemakers, Inc. | Magnetic core flux canceling of ferrites in MRI |
US8160717B2 (en) | 2008-02-19 | 2012-04-17 | Cardiac Pacemakers, Inc. | Model reference identification and cancellation of magnetically-induced voltages in a gradient magnetic field |
US8571661B2 (en) | 2008-10-02 | 2013-10-29 | Cardiac Pacemakers, Inc. | Implantable medical device responsive to MRI induced capture threshold changes |
WO2010096138A1 (en) | 2009-02-19 | 2010-08-26 | Cardiac Pacemakers, Inc. | Systems and methods for providing arrhythmia therapy in mri environments |
JP5306886B2 (en) * | 2009-04-14 | 2013-10-02 | 独立行政法人国立高等専門学校機構 | Bioelectric signal measuring sensor and manufacturing method thereof |
EP2509682B1 (en) | 2009-12-08 | 2015-01-14 | Cardiac Pacemakers, Inc. | Implantable medical device with automatic tachycardia detection and control in mri environments |
JPWO2015170662A1 (en) * | 2014-05-09 | 2017-04-20 | アルプス電気株式会社 | Human body characteristic detection apparatus and glasses-type electronic device |
KR102124430B1 (en) * | 2018-07-16 | 2020-06-18 | 고려대학교 산학협력단 | Method for selecting optimized eeg electrodes based on brain machine interfaces and recording medium for performing the method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5044368A (en) * | 1990-04-23 | 1991-09-03 | Ad-Tech Medical Instrument Corporation | Diagnostic electrode for use with magnetic resonance imaging |
US5217010A (en) * | 1991-05-28 | 1993-06-08 | The Johns Hopkins University | Ecg amplifier and cardiac pacemaker for use during magnetic resonance imaging |
US5411545A (en) * | 1994-03-14 | 1995-05-02 | Medtronic, Inc. | Medical electrical lead |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3993048A (en) * | 1972-09-08 | 1976-11-23 | Biomedical International Company | Biomedical electrode |
US4936306A (en) * | 1985-02-15 | 1990-06-26 | Doty James R | Device and method for monitoring evoked potentials and electroencephalograms |
AT398274B (en) * | 1990-03-22 | 1994-11-25 | Buertlmair Hermann | ELECTRODE FOR ELECTRICAL MEASURING DEVICES AND THE LIKE |
AU667199B2 (en) * | 1991-11-08 | 1996-03-14 | Physiometrix, Inc. | EEG headpiece with disposable electrodes and apparatus and system and method for use therewith |
US5445162A (en) * | 1993-08-27 | 1995-08-29 | Beth Israel Hospital Association | Apparatus and method for recording an electroencephalogram during magnetic resonance imaging |
JP3227593B2 (en) * | 1994-09-22 | 2001-11-12 | 日本光電工業株式会社 | Multi sensor |
US5779651A (en) * | 1997-02-07 | 1998-07-14 | Bio Syntech | Medical apparatus for the diagnosis of cartilage degeneration via spatial mapping of compression-induced electrical potentials |
-
1999
- 1999-11-10 JP JP2000580517A patent/JP4805456B2/en not_active Expired - Lifetime
- 1999-11-10 CA CA2354549A patent/CA2354549C/en not_active Expired - Fee Related
- 1999-11-10 WO PCT/US1999/026459 patent/WO2000027279A1/en active Application Filing
- 1999-11-10 EP EP99958852A patent/EP1128764A4/en not_active Ceased
- 1999-11-10 AU AU16134/00A patent/AU1613400A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5044368A (en) * | 1990-04-23 | 1991-09-03 | Ad-Tech Medical Instrument Corporation | Diagnostic electrode for use with magnetic resonance imaging |
US5217010A (en) * | 1991-05-28 | 1993-06-08 | The Johns Hopkins University | Ecg amplifier and cardiac pacemaker for use during magnetic resonance imaging |
US5411545A (en) * | 1994-03-14 | 1995-05-02 | Medtronic, Inc. | Medical electrical lead |
Non-Patent Citations (1)
Title |
---|
See also references of EP1128764A4 * |
Cited By (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2370776A (en) * | 2000-09-13 | 2002-07-10 | Neoventa Medical Ab | Non-magnetic fetal scalp electrode |
GB2370776B (en) * | 2000-09-13 | 2004-10-13 | Neoventa Medical Ab | Fetal scalp electrode |
EP1273922A1 (en) * | 2001-07-06 | 2003-01-08 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Methods and devices for measuring electrical currents |
WO2005048837A1 (en) * | 2003-11-18 | 2005-06-02 | Nexstim Oy | Electrode structure for measuring electrical responses from the human body |
US7440789B2 (en) | 2003-11-18 | 2008-10-21 | Nexstim Oy | Electrode structure for measuring electrical responses from the human body |
US9302101B2 (en) | 2004-03-30 | 2016-04-05 | Medtronic, Inc. | MRI-safe implantable lead |
US9155877B2 (en) | 2004-03-30 | 2015-10-13 | Medtronic, Inc. | Lead electrode for use in an MRI-safe implantable medical device |
US8989840B2 (en) | 2004-03-30 | 2015-03-24 | Medtronic, Inc. | Lead electrode for use in an MRI-safe implantable medical device |
US10084250B2 (en) | 2005-02-01 | 2018-09-25 | Medtronic, Inc. | Extensible implantable medical lead |
US8825180B2 (en) | 2005-03-31 | 2014-09-02 | Medtronic, Inc. | Medical electrical lead with co-radial multi-conductor coil |
US10398893B2 (en) | 2007-02-14 | 2019-09-03 | Medtronic, Inc. | Discontinuous conductive filler polymer-matrix composites for electromagnetic shielding |
US9044593B2 (en) | 2007-02-14 | 2015-06-02 | Medtronic, Inc. | Discontinuous conductive filler polymer-matrix composites for electromagnetic shielding |
US10537730B2 (en) | 2007-02-14 | 2020-01-21 | Medtronic, Inc. | Continuous conductive materials for electromagnetic shielding |
US9259572B2 (en) | 2007-04-25 | 2016-02-16 | Medtronic, Inc. | Lead or lead extension having a conductive body and conductive body contact |
US9731119B2 (en) | 2008-03-12 | 2017-08-15 | Medtronic, Inc. | System and method for implantable medical device lead shielding |
WO2010030225A1 (en) * | 2008-09-09 | 2010-03-18 | Fernando Seoane Martinez | Method and apparatus for brain damage detection |
US9216286B2 (en) | 2009-04-30 | 2015-12-22 | Medtronic, Inc. | Shielded implantable medical lead with guarded termination |
US10086194B2 (en) | 2009-04-30 | 2018-10-02 | Medtronic, Inc. | Termination of a shield within an implantable medical lead |
US9205253B2 (en) | 2009-04-30 | 2015-12-08 | Medtronic, Inc. | Shielding an implantable medical lead |
US9272136B2 (en) | 2009-04-30 | 2016-03-01 | Medtronic, Inc. | Grounding of a shield within an implantable medical lead |
US9186499B2 (en) | 2009-04-30 | 2015-11-17 | Medtronic, Inc. | Grounding of a shield within an implantable medical lead |
US9452284B2 (en) | 2009-04-30 | 2016-09-27 | Medtronic, Inc. | Termination of a shield within an implantable medical lead |
US9220893B2 (en) | 2009-04-30 | 2015-12-29 | Medtronic, Inc. | Shielded implantable medical lead with reduced torsional stiffness |
US9629998B2 (en) | 2009-04-30 | 2017-04-25 | Medtronics, Inc. | Establishing continuity between a shield within an implantable medical lead and a shield within an implantable lead extension |
US10035014B2 (en) | 2009-04-30 | 2018-07-31 | Medtronic, Inc. | Steering an implantable medical lead via a rotational coupling to a stylet |
US9078584B2 (en) | 2010-04-21 | 2015-07-14 | Tohoku University | Electroencephalogram electrode unit for small animals and measurement system using the same |
EP2561806A4 (en) * | 2010-04-21 | 2014-08-20 | Univ Tohoku | Electroencephalogram electrode unit for small animals and measurement system using same |
EP2561806A1 (en) * | 2010-04-21 | 2013-02-27 | Tohoku University | Electroencephalogram electrode unit for small animals and measurement system using same |
US9463317B2 (en) | 2012-04-19 | 2016-10-11 | Medtronic, Inc. | Paired medical lead bodies with braided conductive shields having different physical parameter values |
CN102727194A (en) * | 2012-05-04 | 2012-10-17 | 燕山大学 | Electroencephalogram electrode space positioning system and positioning method |
US9993638B2 (en) | 2013-12-14 | 2018-06-12 | Medtronic, Inc. | Devices, systems and methods to reduce coupling of a shield and a conductor within an implantable medical lead |
US10279171B2 (en) | 2014-07-23 | 2019-05-07 | Medtronic, Inc. | Methods of shielding implantable medical leads and implantable medical lead extensions |
US10155111B2 (en) | 2014-07-24 | 2018-12-18 | Medtronic, Inc. | Methods of shielding implantable medical leads and implantable medical lead extensions |
CN107495964A (en) * | 2017-09-15 | 2017-12-22 | 西安富德医疗电子有限公司 | Disposable medical spiral pin electrode |
Also Published As
Publication number | Publication date |
---|---|
CA2354549C (en) | 2013-01-08 |
JP4805456B2 (en) | 2011-11-02 |
CA2354549A1 (en) | 2000-05-18 |
JP2002529132A (en) | 2002-09-10 |
EP1128764A4 (en) | 2003-06-04 |
EP1128764A1 (en) | 2001-09-05 |
AU1613400A (en) | 2000-05-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6708051B1 (en) | FMRI compatible electrode and electrode placement techniques | |
CA2354549C (en) | Fmri compatible electrode and electrode placement techniques | |
Usakli | Improvement of EEG signal acquisition: An electrical aspect for state of the art of front end | |
CN104470423B (en) | For the method and apparatus that collects and analyze EEG data | |
US7127279B2 (en) | EMG electrode apparatus and positioning system | |
JP4391823B2 (en) | Electrodynamic sensors and their applications | |
US20070255127A1 (en) | Mobile electroencephalograph data collection and diagnosis system | |
US20060149139A1 (en) | Apparatus and method for ascertaining and recording electrophysiological signals | |
WO2005094674A1 (en) | Active, multiplexed digital electrodes for eeg, ecg and emg applications | |
CN211213132U (en) | Full head type magnetoencephalogram device | |
KR101987536B1 (en) | Apparatus for measuring electroencephalogram and method for measuring electroencephalogram using the same | |
Arman et al. | Cost-effective EEG signal acquisition and recording system | |
Boucsein et al. | Methods of electrodermal recording | |
Zaer et al. | An intracortical implantable brain-computer interface for telemetric real-time recording and manipulation of neuronal circuits for closed-loop intervention | |
US20090326387A1 (en) | Electrocardiogram and Respiration Monitoring in Animals | |
Gath et al. | Measurements of the uptake area of small-size electromyographic electrodes | |
EP1119287A4 (en) | Emg electrode apparatus and positioning system | |
Parker et al. | Acquisition of electrophysiologic signals during magnetic resonance imaging | |
CN217853005U (en) | A wear-type brain electricity bandeau for sheep | |
US11622720B2 (en) | Disturbances indicator for a wearable device | |
CN117752341A (en) | Integrated brain signal acquisition device, acquisition method and acquisition circuit | |
Usakli | Improving measurement performance of EEG signal acquisition: An electrical aspect for front-end | |
Hung et al. | Assessment of Sleep in Mice | |
Liao et al. | Design and Implementation of Wearable and Wireless Multi-Channel Brain-Computer Interface with the Novel Dry Sensors | |
Virtanen | EEG combined with MEG and TMS in studies of human brain function |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref country code: AU Ref document number: 2000 16134 Kind code of ref document: A Format of ref document f/p: F |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
ENP | Entry into the national phase |
Ref document number: 2354549 Country of ref document: CA Ref country code: JP Ref document number: 2000 580517 Kind code of ref document: A Format of ref document f/p: F Ref country code: CA Ref document number: 2354549 Kind code of ref document: A Format of ref document f/p: F |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1999958852 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 09831687 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 1999958852 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |