EP1128764A1 - Electrode compatible avec un systeme irmf et techniques de placement d'electrodes - Google Patents
Electrode compatible avec un systeme irmf et techniques de placement d'electrodesInfo
- Publication number
- EP1128764A1 EP1128764A1 EP99958852A EP99958852A EP1128764A1 EP 1128764 A1 EP1128764 A1 EP 1128764A1 EP 99958852 A EP99958852 A EP 99958852A EP 99958852 A EP99958852 A EP 99958852A EP 1128764 A1 EP1128764 A1 EP 1128764A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- electrode assembly
- electrodes
- signals
- assembly
- 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.)
- Ceased
Links
- 238000002599 functional magnetic resonance imaging Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 22
- 239000004033 plastic Substances 0.000 claims abstract description 19
- 229920003023 plastic Polymers 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000002595 magnetic resonance imaging Methods 0.000 claims abstract description 11
- 229920001971 elastomer Polymers 0.000 claims abstract description 4
- 239000003302 ferromagnetic material Substances 0.000 claims abstract 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 20
- 230000001054 cortical effect Effects 0.000 claims description 16
- 239000003792 electrolyte Substances 0.000 claims description 10
- 238000003384 imaging method Methods 0.000 claims description 6
- 229910000497 Amalgam Inorganic materials 0.000 claims description 4
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 4
- 230000033001 locomotion Effects 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 claims description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 claims 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims 3
- -1 Tinsel Substances 0.000 claims 3
- 239000004917 carbon fiber Substances 0.000 claims 3
- 229910052741 iridium Inorganic materials 0.000 claims 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims 3
- 229910052697 platinum Inorganic materials 0.000 claims 3
- 229910001220 stainless steel Inorganic materials 0.000 claims 3
- 239000010935 stainless steel Substances 0.000 claims 3
- 239000011135 tin Substances 0.000 claims 3
- 238000011109 contamination Methods 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000004020 conductor Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 210000003128 head Anatomy 0.000 description 9
- 210000004556 brain Anatomy 0.000 description 8
- 239000004744 fabric Substances 0.000 description 6
- 230000037361 pathway Effects 0.000 description 4
- 210000004761 scalp Anatomy 0.000 description 4
- 208000032365 Electromagnetic interference Diseases 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001766 physiological effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10791898P | 1998-11-10 | 1998-11-10 | |
US107918P | 1998-11-10 | ||
PCT/US1999/026459 WO2000027279A1 (fr) | 1998-11-10 | 1999-11-10 | Electrode compatible avec un systeme irmf et techniques de placement d'electrodes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1128764A1 true EP1128764A1 (fr) | 2001-09-05 |
EP1128764A4 EP1128764A4 (fr) | 2003-06-04 |
Family
ID=22319159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99958852A Ceased EP1128764A4 (fr) | 1998-11-10 | 1999-11-10 | Electrode compatible avec un systeme irmf et techniques de placement d'electrodes |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1128764A4 (fr) |
JP (1) | JP4805456B2 (fr) |
AU (1) | AU1613400A (fr) |
CA (1) | CA2354549C (fr) |
WO (1) | WO2000027279A1 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8543207B2 (en) | 2004-12-17 | 2013-09-24 | Cardiac Pacemakers, Inc. | MRI operation modes for implantable medical devices |
US8554335B2 (en) | 2007-12-06 | 2013-10-08 | Cardiac Pacemakers, Inc. | Method and apparatus for disconnecting the tip electrode during MRI |
US8565874B2 (en) | 2009-12-08 | 2013-10-22 | Cardiac Pacemakers, Inc. | Implantable medical device with automatic tachycardia detection and control in MRI environments |
US8897875B2 (en) | 2007-12-06 | 2014-11-25 | Cardiac Pacemakers, Inc. | Selectively connecting the tip electrode during therapy for MRI shielding |
US8977356B2 (en) | 2009-02-19 | 2015-03-10 | Cardiac Pacemakers, Inc. | Systems and methods for providing arrhythmia therapy in MRI environments |
US9561378B2 (en) | 2008-10-02 | 2017-02-07 | Cardiac Pacemakers, Inc. | Implantable medical device responsive to MRI induced capture threshold changes |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2370776B (en) * | 2000-09-13 | 2004-10-13 | Neoventa Medical Ab | Fetal scalp electrode |
EP1273922B1 (fr) * | 2001-07-06 | 2007-05-23 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Appareil et procédé de mesure de courant |
FI119172B (fi) | 2003-11-18 | 2008-08-29 | Nexstim Oy | Elektrodirakenne sähköisten vasteiden mittaamiseksi ihmiskehosta |
US7844344B2 (en) | 2004-03-30 | 2010-11-30 | Medtronic, Inc. | MRI-safe implantable lead |
US8989840B2 (en) | 2004-03-30 | 2015-03-24 | Medtronic, Inc. | Lead electrode for use in an MRI-safe implantable medical device |
US9155877B2 (en) | 2004-03-30 | 2015-10-13 | Medtronic, Inc. | Lead electrode for use in an MRI-safe implantable medical device |
US8280526B2 (en) | 2005-02-01 | 2012-10-02 | 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 |
US10537730B2 (en) | 2007-02-14 | 2020-01-21 | Medtronic, Inc. | Continuous conductive materials for electromagnetic shielding |
US9044593B2 (en) | 2007-02-14 | 2015-06-02 | Medtronic, Inc. | Discontinuous conductive filler polymer-matrix composites for electromagnetic shielding |
US8483842B2 (en) | 2007-04-25 | 2013-07-09 | Medtronic, Inc. | Lead or lead extension having a conductive body and conductive body contact |
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 |
US9037263B2 (en) | 2008-03-12 | 2015-05-19 | Medtronic, Inc. | System and method for implantable medical device lead shielding |
US20110208084A1 (en) * | 2008-09-09 | 2011-08-25 | Fernando Seoane Martinez | Method and apparatus for brain damage detection |
JP5306886B2 (ja) * | 2009-04-14 | 2013-10-02 | 独立行政法人国立高等専門学校機構 | 生体電気信号測定用センサ及びその製造方法 |
EP2821097B1 (fr) | 2009-04-30 | 2017-10-04 | Medtronic Inc. | Terminaison d'un blindage dans un fil médical implantable |
WO2011132756A1 (fr) * | 2010-04-21 | 2011-10-27 | 国立大学法人東北大学 | Unité d'électrodes pour encéphalogramme destinée à des petits animaux et son emploi dans un système de mesure |
US9463317B2 (en) | 2012-04-19 | 2016-10-11 | Medtronic, Inc. | Paired medical lead bodies with braided conductive shields having different physical parameter values |
CN102727194B (zh) * | 2012-05-04 | 2014-01-22 | 燕山大学 | 一种脑电电极空间定位***和定位方法 |
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 |
JPWO2015170662A1 (ja) * | 2014-05-09 | 2017-04-20 | アルプス電気株式会社 | 人体特性検出装置及び眼鏡型電子機器 |
EP3171931B1 (fr) | 2014-07-23 | 2021-11-10 | Medtronic, Inc. | Procédés de protection de dérivations médicales implantables et d'extension de dérivation médicale implantable |
US10155111B2 (en) | 2014-07-24 | 2018-12-18 | Medtronic, Inc. | Methods of shielding implantable medical leads and implantable medical lead extensions |
CN107495964A (zh) * | 2017-09-15 | 2017-12-22 | 西安富德医疗电子有限公司 | 医用一次性螺旋针电极 |
KR102124430B1 (ko) * | 2018-07-16 | 2020-06-18 | 고려대학교 산학협력단 | Bmi용 eeg 최소 전극 선택 방법 및 상기 방법을 수행하기 위한 저장 매체 |
Citations (8)
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 |
US5044368A (en) * | 1990-04-23 | 1991-09-03 | Ad-Tech Medical Instrument Corporation | Diagnostic electrode for use with magnetic resonance imaging |
EP0449800A1 (fr) * | 1990-03-22 | 1991-10-02 | Hermann Bürtlmair | Electrode destinée à un appareil de mesure |
EP0541393A1 (fr) * | 1991-11-08 | 1993-05-12 | Physiometrix, Inc. | Support et procédé d'utilisation destinés à des électrodes EEG, jetées après l'emploi |
US5445162A (en) * | 1993-08-27 | 1995-08-29 | Beth Israel Hospital Association | Apparatus and method for recording an electroencephalogram during magnetic resonance imaging |
US5727549A (en) * | 1994-09-22 | 1998-03-17 | Nihon Kohden Corporation | Multi purpose 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 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
1999
- 1999-11-10 AU AU16134/00A patent/AU1613400A/en not_active Abandoned
- 1999-11-10 CA CA2354549A patent/CA2354549C/fr not_active Expired - Fee Related
- 1999-11-10 EP EP99958852A patent/EP1128764A4/fr not_active Ceased
- 1999-11-10 JP JP2000580517A patent/JP4805456B2/ja not_active Expired - Lifetime
- 1999-11-10 WO PCT/US1999/026459 patent/WO2000027279A1/fr active Application Filing
Patent Citations (8)
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 |
EP0449800A1 (fr) * | 1990-03-22 | 1991-10-02 | Hermann Bürtlmair | Electrode destinée à un appareil de mesure |
US5044368A (en) * | 1990-04-23 | 1991-09-03 | Ad-Tech Medical Instrument Corporation | Diagnostic electrode for use with magnetic resonance imaging |
EP0541393A1 (fr) * | 1991-11-08 | 1993-05-12 | Physiometrix, Inc. | Support et procédé d'utilisation destinés à des électrodes EEG, jetées après l'emploi |
US5445162A (en) * | 1993-08-27 | 1995-08-29 | Beth Israel Hospital Association | Apparatus and method for recording an electroencephalogram during magnetic resonance imaging |
US5727549A (en) * | 1994-09-22 | 1998-03-17 | Nihon Kohden Corporation | Multi purpose 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 |
Non-Patent Citations (1)
Title |
---|
See also references of WO0027279A1 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8543207B2 (en) | 2004-12-17 | 2013-09-24 | Cardiac Pacemakers, Inc. | MRI operation modes for implantable medical devices |
US8886317B2 (en) | 2004-12-17 | 2014-11-11 | Cardiac Pacemakers, Inc. | MRI operation modes for implantable medical devices |
US8554335B2 (en) | 2007-12-06 | 2013-10-08 | Cardiac Pacemakers, Inc. | Method and apparatus for disconnecting the tip electrode during MRI |
US8897875B2 (en) | 2007-12-06 | 2014-11-25 | Cardiac Pacemakers, Inc. | Selectively connecting the tip electrode during therapy for MRI shielding |
US9561378B2 (en) | 2008-10-02 | 2017-02-07 | Cardiac Pacemakers, Inc. | Implantable medical device responsive to MRI induced capture threshold changes |
US8977356B2 (en) | 2009-02-19 | 2015-03-10 | Cardiac Pacemakers, Inc. | Systems and methods for providing arrhythmia therapy in MRI environments |
US8565874B2 (en) | 2009-12-08 | 2013-10-22 | Cardiac Pacemakers, Inc. | Implantable medical device with automatic tachycardia detection and control in MRI environments |
US9381371B2 (en) | 2009-12-08 | 2016-07-05 | Cardiac Pacemakers, Inc. | Implantable medical device with automatic tachycardia detection and control in MRI environments |
Also Published As
Publication number | Publication date |
---|---|
EP1128764A4 (fr) | 2003-06-04 |
CA2354549C (fr) | 2013-01-08 |
CA2354549A1 (fr) | 2000-05-18 |
JP2002529132A (ja) | 2002-09-10 |
JP4805456B2 (ja) | 2011-11-02 |
AU1613400A (en) | 2000-05-29 |
WO2000027279A1 (fr) | 2000-05-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6708051B1 (en) | FMRI compatible electrode and electrode placement techniques | |
CA2354549C (fr) | Electrode compatible avec un systeme irmf et techniques de placement d'electrodes | |
Usakli | Improvement of EEG signal acquisition: An electrical aspect for state of the art of front end | |
CN104470423B (zh) | 用于收集和分析脑电图数据的方法和设备 | |
US7127279B2 (en) | EMG electrode apparatus and positioning system | |
JP4391823B2 (ja) | 電気力学センサーとその応用 | |
US20070255127A1 (en) | Mobile electroencephalograph data collection and diagnosis system | |
US20060149139A1 (en) | Apparatus and method for ascertaining and recording electrophysiological signals | |
US20050215916A1 (en) | Active, multiplexed digital electrodes for EEG, ECG and EMG applications | |
KR101987536B1 (ko) | 뇌파 측정장치 및 이를 이용한 뇌파 측정방법 | |
CN211213132U (zh) | 一种全头型脑磁图装置 | |
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 | |
EP1119287B1 (fr) | Appareil et systeme de positionnement d'electrodes emg | |
Parker et al. | Acquisition of electrophysiologic signals during magnetic resonance imaging | |
CN217853005U (zh) | 一种用于羊的头戴式脑电头带 | |
CN117752341A (zh) | 一体式脑信号采集装置、采集方法及采集电路 | |
Usakli | Improving measurement performance of EEG signal acquisition: An electrical aspect for front-end | |
CN110121292B (zh) | 用于可穿戴设备的干扰指示器 | |
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 |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20010604 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NEUROSOFT, INC. |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: NEUROSOFT, INC. |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: COMPUMEDICS LIMITED |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: COMPUMEDICS LIMITED |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20030425 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: 7A 61B 5/0478 A |
|
17Q | First examination report despatched |
Effective date: 20031126 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: COMPUMEDICS LIMITED |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: COMPUMEDICS LIMITED |
|
APBN | Date of receipt of notice of appeal recorded |
Free format text: ORIGINAL CODE: EPIDOSNNOA2E |
|
APBR | Date of receipt of statement of grounds of appeal recorded |
Free format text: ORIGINAL CODE: EPIDOSNNOA3E |
|
APAF | Appeal reference modified |
Free format text: ORIGINAL CODE: EPIDOSCREFNE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R003 |
|
APBT | Appeal procedure closed |
Free format text: ORIGINAL CODE: EPIDOSNNOA9E |
|
APAM | Information on closure of appeal procedure modified |
Free format text: ORIGINAL CODE: EPIDOSCNOA9E |
|
APBB | Information on closure of appeal procedure deleted |
Free format text: ORIGINAL CODE: EPIDOSDNOA9E |
|
APBT | Appeal procedure closed |
Free format text: ORIGINAL CODE: EPIDOSNNOA9E |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 20120611 |