WO2005115542A1 - Couplage inductif par telemetrie - Google Patents

Couplage inductif par telemetrie Download PDF

Info

Publication number
WO2005115542A1
WO2005115542A1 PCT/IE2005/000056 IE2005000056W WO2005115542A1 WO 2005115542 A1 WO2005115542 A1 WO 2005115542A1 IE 2005000056 W IE2005000056 W IE 2005000056W WO 2005115542 A1 WO2005115542 A1 WO 2005115542A1
Authority
WO
WIPO (PCT)
Prior art keywords
coils
channel
coil
receiver
coupling
Prior art date
Application number
PCT/IE2005/000056
Other languages
English (en)
Inventor
Stephen O'reilly
Olivier Chevalerias
John Charles Alderman
Original Assignee
University College Cork - National University Of Ireland, Cork
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 University College Cork - National University Of Ireland, Cork filed Critical University College Cork - National University Of Ireland, Cork
Publication of WO2005115542A1 publication Critical patent/WO2005115542A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/372—Arrangements in connection with the implantation of stimulators
    • A61N1/378—Electrical supply
    • A61N1/3787—Electrical supply from an external energy source
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/372—Arrangements in connection with the implantation of stimulators
    • A61N1/37211—Means for communicating with stimulators
    • A61N1/37217—Means for communicating with stimulators characterised by the communication link, e.g. acoustic or tactile
    • A61N1/37223—Circuits for electromagnetic coupling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/273—Adaptation for carrying or wearing by persons or animals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/27—Spiral antennas

Definitions

  • the invention relates to inductive devices.
  • a two-channel implantable stimulator was developed. This consists of an externally worn transmitter inductively coupled to an implanted receiver unit. The two channels of the receiver are connected by electrodes to the nerves being stimulated. By inductively coupling the external transmitter to the implant there is no need for a transcutaneous wire link or a battery in the implant. With inductive coupling there are typically two resonant circuits (one in the external transmitter and the other in the implanted receiver) that are tuned to the same frequency. Each resonant circuit consists of a parallel or series arrangement of a capacitor and inductor.
  • a voltage is induced in the receiver resonant circuit and hence power is transferred from transmitter to receiver.
  • there are two receivers in the implant each of which is tuned to a different frequency and used to stimulate a different nerve.
  • Wirewound coils which are used for the inductors in the implant tend to be bulky and there are concerns about the repeatability and reliability of such an approach.
  • each channel has to be independently monitored and controlled. Movement of the implant relative to the external stimulator could result in an increase in the signal on one channel and a decrease in the signal on the second channel. This depends on the direction and amount of relative displacement. Thus, implementing a control loop on such a setup could prove to be very difficult.
  • the invention is directed towards providing an improved implantable inductor.
  • a receiving device comprising a plurality of coils, the coils being mutually arranged to minimise differences in coupling of the coils with another transmitting device arising from movement of the devices relative to each other.
  • the layout of the coils is substantially symmetrical.
  • the coils are planar.
  • each coil comprises a pair of opposed and inter-connected sectors in a disc-shaped footprint.
  • the sectors are quadrants.
  • the coils are on a disc-shaped substrate.
  • the coils are of magnet wire construction.
  • the invention also provides an inductive coupling system comprising a receiver device as defined above.
  • the system is a medical implant.
  • the system comprises both planar and magnet wire receiving coils.
  • the plurality of coils is for both receiving and transmitting.
  • the system comprises a monitoring circuit for monitoring inductive coupling between coils.
  • the monitoring circuit monitors coupling on only one coil, and due to the symmetric nature of the receiver coils, the power transmitted / coupling only needs to be monitored for a single receiver coil and the same percentage correction is given for all coils.
  • Fig. 1 is a plan view of spiral receiver coils of a dual-channel stimulator
  • Figs. 2 and 3 are plan views of coils of alternative stimulators
  • Figs. 4 and 5 are plots of test results.
  • an implantable receiver inductor 1 comprises two spiral planar coils 2 and 3 on a substrate 4.
  • an alternative implantable receiver inductor 10 comprises a substrate 11 with the same footprint as that of Fig. 1.
  • coils 12 and 13 are D-shaped to make optimum use of this footprint.
  • each coil is for one channel and there is a need to monitor each channel.
  • each coil comprises two diametrically-opposed quadrant-shaped parts. Because each coil is arranged across opposed quadrants, a change in orientation will have the same effect in both coils. Therefore, only a single channel need be monitored.
  • the two receiver coils so that each coil is spread across different physical locations, the varying effect of relative displacement between transmitter and receiver is neutralised such that if a certain displacement results in an increased signal on one channel, then there will also be a corresponding increased signal on the second channel. Similarly, a displacement leading to a decreased signal on one channel will also result in a similar decrease in the signal on the second channel.
  • a second channel can also be monitored and controlled indirectly without any further resources required.
  • Another problem that the invention overcomes is one of angular displacement between transmitter and receiver coils. If the coils are not perfectly parallel, then the transmitter coil may be preferentially coupled to one of the receiver coils. The invention provides a solution to this problem.
  • Planar technology offers benefits of reduced cost, reduced profile, increased reliability, and increased repeatability.
  • a major advantage of the invention is that the control of the system is simplified and that by monitoring one channel, the two (or more) may be controlled.
  • the invention is not limited to the embodiments described but may be varied in construction and detail. Although the invention has been described for a biomedical application (dual channel drop foot stimulator) it may also find applications in other areas such as veterinary, wearable computing, and ambient electronics.
  • the device may also have only one or more than two channels.
  • the coils may be for transmitting rather than receiving.
  • each coil comprises a pair of diametrically opposed sectors other than 90° quadrants, for example diametrically opposed 45° sectors. In the latter embodiment, there may therefore be a total of four coils (one coil per channel) in the same footprint.

Landscapes

  • Health & Medical Sciences (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Physics & Mathematics (AREA)
  • Radiology & Medical Imaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Electrotherapy Devices (AREA)

Abstract

L'invention concerne une bobine d'induction de réception implantable constituée de deux bobines (bobine 1 et bobine 2, figure 3), chaque bobine comprenant deux pièces en quadrant diamétralement opposées. Chaque bobine étant disposée sur des quadrants opposés, un changement d'orientation produira le même effet dans les deux bobines. En conséquence, on ne doit surveiller qu'un canal. En disposant les deux bobines de réception de façon que chacune soit étalée sur des emplacements physiques différents, on neutralise l'effet variable du déplacement relatif entre l'émetteur et le récepteur, ainsi, si un déplacement donné produit un signal accru sur un canal, un signal accru correspondant se produira également sur le second canal. De même, un déplacement donnant lieu à un signal réduit sur un canal, produira également une diminution analogue du signal sur le second canal. En conséquence, en surveillant et en régulant un seul canal, on peut également surveiller et réguler indirectement un second canal sans faire appel à d'autres ressources supplémentaires.
PCT/IE2005/000056 2004-05-14 2005-05-16 Couplage inductif par telemetrie WO2005115542A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IE20040338 2004-05-14
IE2004/0338 2004-05-14

Publications (1)

Publication Number Publication Date
WO2005115542A1 true WO2005115542A1 (fr) 2005-12-08

Family

ID=34966820

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IE2005/000056 WO2005115542A1 (fr) 2004-05-14 2005-05-16 Couplage inductif par telemetrie

Country Status (1)

Country Link
WO (1) WO2005115542A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008078251A1 (fr) * 2006-12-21 2008-07-03 Koninklijke Philips Electronics N.V. Dispositif d'intervention sans fil et système pour une transmission d'énergie sans fil
WO2020040639A3 (fr) * 2018-08-24 2020-04-02 Salvia Bioelectronics B.V. Dispositif de stimulation électrique pour tissu corporel

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859991A (en) * 1987-08-28 1989-08-22 Sensormatic Electronics Corporation Electronic article surveillance system employing time domain and/or frequency domain analysis and computerized operation
EP0352513A2 (fr) * 1988-07-29 1990-01-31 Knogo Corporation Système de surveillance d'articles isolés contre les influences indésirables et antenne à cet effet
NL9300250A (nl) * 1993-02-09 1994-09-01 Nedap Nv Ontkoppelde antennespoelen.
US5973495A (en) * 1995-04-28 1999-10-26 Mansfield; Peter Method and apparatus for eliminating mutual inductance effects in resonant coil assemblies
US6009350A (en) * 1998-02-06 1999-12-28 Medtronic, Inc. Implant device telemetry antenna
EP1298578A1 (fr) * 2001-01-26 2003-04-02 Sony Corporation Carte circuit imprime sans contact

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4859991A (en) * 1987-08-28 1989-08-22 Sensormatic Electronics Corporation Electronic article surveillance system employing time domain and/or frequency domain analysis and computerized operation
EP0352513A2 (fr) * 1988-07-29 1990-01-31 Knogo Corporation Système de surveillance d'articles isolés contre les influences indésirables et antenne à cet effet
NL9300250A (nl) * 1993-02-09 1994-09-01 Nedap Nv Ontkoppelde antennespoelen.
US5973495A (en) * 1995-04-28 1999-10-26 Mansfield; Peter Method and apparatus for eliminating mutual inductance effects in resonant coil assemblies
US6009350A (en) * 1998-02-06 1999-12-28 Medtronic, Inc. Implant device telemetry antenna
EP1298578A1 (fr) * 2001-01-26 2003-04-02 Sony Corporation Carte circuit imprime sans contact

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section EI Week 199436, Derwent World Patents Index; Class W02, AN 1994-291711, XP002339177 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008078251A1 (fr) * 2006-12-21 2008-07-03 Koninklijke Philips Electronics N.V. Dispositif d'intervention sans fil et système pour une transmission d'énergie sans fil
WO2020040639A3 (fr) * 2018-08-24 2020-04-02 Salvia Bioelectronics B.V. Dispositif de stimulation électrique pour tissu corporel

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