EP3784342A2 - Dispositif d'emission magnetique pour stimulation magnetique cerebrale non invasive - Google Patents
Dispositif d'emission magnetique pour stimulation magnetique cerebrale non invasiveInfo
- Publication number
- EP3784342A2 EP3784342A2 EP19791449.2A EP19791449A EP3784342A2 EP 3784342 A2 EP3784342 A2 EP 3784342A2 EP 19791449 A EP19791449 A EP 19791449A EP 3784342 A2 EP3784342 A2 EP 3784342A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- spiral
- antenna
- magnetic
- emission device
- point
- 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.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N2/00—Magnetotherapy
- A61N2/004—Magnetotherapy specially adapted for a specific therapy
- A61N2/006—Magnetotherapy specially adapted for a specific therapy for magnetic stimulation of nerve tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N2/00—Magnetotherapy
- A61N2/02—Magnetotherapy using magnetic fields produced by coils, including single turn loops or electromagnets
Definitions
- the present invention relates to a magnetic emission device for noninvasive magnetic brain stimulation and the use of such a device.
- the invention applies more particularly to a magnetic emission device for noninvasive magnetic brain stimulation, comprising an antenna (generally referred to as "coil” in English).
- Non-invasive brain magnetic stimulation methods such as Transcranial Magnetic Stimulation (TMS) are used to treat various neurological or psychiatric conditions such as depression, dystonia, pain, tinnitus or sequelae. stroke (non-exhaustive list).
- TMS Transcranial Magnetic Stimulation
- the common principle of these methods is to non-invasively induce electrical currents in brain regions, thus modulating their level of activity.
- the antenna is connected to an electrical power generation device so as to radiate a magnetic field near a human head, which induces an electric current in any excitable tissue of the brain.
- These electric currents generate different physiological or behavioral effects depending on the affected cerebral region and the intensity of the field.
- antennas of different sizes and shapes There are antennas of different sizes and shapes, these parameters largely determine the distribution and penetration capacity of the magnetic field in a given brain region, its extent and its spatial resolution.
- the subject of the invention is therefore a magnetic emission device for noninvasive magnetic brain stimulation, comprising an antenna and characterized in that it further comprises means designed to select one of a plurality of predefined portions of the antenna and to connect the selected portion to a current generating device to, on the one hand, pass the current in the selected portion of the antenna to radiate a magnetic field and, on the other hand, to prevent the current from passing out of the selected portion of the antenna.
- the antenna comprises at least one spiral having several turns and each predefined portion has a segment of each spiral.
- the segments of each spiral extend respectively to whole numbers of turns of the spiral, these integers being for example consecutive and starting for example to one.
- the segments of each spiral extend from the same first point of the spiral up to the second points respectively staggering along the spiral.
- the means comprise, for each spiral, a switch designed to selectively connect each of the second points to the current generating device.
- the first point is intended to be connected to the current generating device.
- the first point is located more in the center of the spiral than the second points.
- the antenna comprises two parts and the magnetic emission device further comprises a relative positioning device of the two parts according to the selected predefined portion.
- the magnetic emission device further comprises the current generating device and the current generating device is designed to supply a current having at least one pulse of duration between 0.5 and 4 ms, of preferably between 1 and 2 ms, and intensity between 500 and 10,000 A, preferably between 1000 and 3000 A.
- the invention also relates to the use of a magnetic emission device according to the invention, this use comprising:
- FIG. 1 schematically represents the general structure of a magnetic emission device for noninvasive magnetic brain stimulation, according to a first embodiment of the invention
- FIG. 2 illustrates the successive steps of a non-invasive brain magnetic stimulation method, according to one embodiment of the invention
- FIG. 3 schematically represents the general structure of a magnetic emission device for non-invasive cerebral magnetic stimulation, according to a second embodiment of the invention
- FIGS. 4, 5 and 6 represent possible positions of two spirals of an antenna of the magnetic emission device of FIG. 3, and
- FIGS. 7 to 9 are graphs illustrating the performance of different magnetic emission devices according to the invention, compared to known antennas.
- a magnetic emission device 100 for non-invasive cerebral magnetic stimulation according to a first embodiment of the invention will now be described by way of non-limiting example.
- the magnetic emission device 100 firstly comprises an antenna 102 comprising a flat spiral with straight sections having several turns (three turns in the example described) and extending from a central end S to a peripheral end E 3 .
- the magnetic emission device 100 also preferably comprises a cooling device (not shown) of the antenna 102.
- the cooling device comprises a cooling fluid (gas and / or liquid) in which the antenna 102 is immersed.
- the antenna 102 may be hollow (tubular) and the cooling fluid flows inside the antenna 102.
- the magnetic emission device 100 further comprises a current generation device 104 designed to supply a current having at least one pulse of duration between 0.5 and 4 ms, preferably between 1 and 2 ms, and of intensity between 500 and 10 000 A, preferably between 1000 and 3000 A. In the case where a pulse train is sent, this pulse train has a frequency between 0.1 Hz and 10 kHz, preferably between 0.9 to 50 Hz.
- the current generating device 104 is connected to the central end S of the spiral.
- the magnetic transmitter device 100 further comprises means 106 adapted to select one of a plurality of predefined portions of the antenna 102 and to connect the selected portion to the current generation device 104.
- each predefined portion comprises a segment of the spiral, extending over an integer number of spiral turns.
- the segments extend from the same point formed in the example described by the central end S up to points E 1 respectively; E 2 , E 3 (the point E 3 being formed by the peripheral end E 3 of the spiral) extending along the spiral from the central end S.
- the points S, E 1; E 2 , E 3 are spaced, along the spiral, substantially a spiral turn from one point to the next.
- the points S and E are spaced substantially from a spiral turn
- the points E and E 2 are spaced substantially from a spiral turn
- the points E 2 and E 3 are spaced substantially by one turn of spiral .
- three predefined portions of the antenna 102 are thus provided: a first portion extending over a spiral tower, from the point S to the point E 1; a second portion extending over two turns of spiral, from point S to point E 2 , and a third portion extending over three spiral turns, from point S to point E 3 (i.e. the entire antenna 102).
- the means 106 comprise firstly a switch 108 designed to selectively connect each of the points E 1; E 2 , E 3 to the current generating device 104.
- the current device 104 is connected between the point S and the point E 1; E 2 or E 3 selected.
- the current generated by the current generating device 104 therefore passes into the selected portion of the antenna 102, but does not pass out of that selected portion.
- only the selected portion of the antenna 102 radiates a magnetic field.
- the switch 108 comprises a switch controllable by point E 1; E 2 or E 3 being selectable, this controllable switch being connected, on the one hand, to the current generating device and, on the other hand, to the point E 1; E 2 or E 3 considered.
- Each controllable switch can be realized, for example, with transistors or electronic relays.
- the means 106 furthermore comprise a device 10 for controlling the current generation device 104 and the switch 108.
- the control device 1 10 comprises, for example, a computer comprising a processing unit 1 10A and a memory 1 10B coupled to the processing unit 1 10A and intended to contain a computer program 1 10C comprising instructions to be executed by the processing unit 1 10A, for carrying out the steps implemented by the control device 1 10 which will be described in reference to Figure 2.
- the control device 1 10 further comprises a man / machine interface 1 10D to allow its control by a user.
- control device 1 10 could be formed of programmed hardware means micro or micro wired in dedicated integrated circuits.
- control device 1 10 could be an electronic device consisting only of digital circuits (without a computer program) for carrying out the same actions.
- the antenna 102 is placed near the head of a subject.
- a user uses the interface 1 10D of the control device 1 10 to select a stimulation protocol from among a plurality of predefined protocols, as well as an antenna portion from the predefined portions.
- the predefined protocols include one or more of the following protocols:
- paired-pulse TMS double-pulse transcranial magnetic stimulation protocol
- TMS transcranial magnetic stimulation protocol with triple / quadruple pulses
- the current generation device 104 is controlled to produce three or four pulses separated from each other by one interval between 1 ms and 5 s (privileged mode from 1, 5 ms to 1, 25 s),
- repetitive Transcranial Magnetic Stimulation Protocol (called “Repetitive TMS” in English), in which the current generation device 104 is controlled to produce pulses with a frequency of between 0.1 Hz and 10 kHz (privileged mode of 0.9 Hz at 50 Hz) including continuous or intermittent theta burst pauses ("theta-burst").
- control device 110 controls the switch 108 so that the switch 108 connects the selected antenna portion to the current generating device 104.
- control device 1 10 controls the current generation device 104 so that the latter provides a current according to the selected protocol.
- the selected portion of the antenna 102 is traversed by the current and radiates a magnetic field in the subject's head.
- an electric field then appears in the subject's head, thereby achieving non-invasive brain magnetic stimulation.
- the method then returns to step 204 where the user can select another protocol and / or another portion of the antenna 102.
- the selection step 204 can be implemented once for several iterations of the step loop 206, 208, 210.
- the user then defines a sequence of protocol / portion pairs to respectively perform at each iteration of the loop of steps 206, 208, 210.
- the following sequence can be defined: protocol "single-pulse TMS" for the first portion, then the second portion, then the third portion of the antenna 102, then "repetitive TMS" protocol for the second portion, then for the first portion of the antenna 102.
- the control device 1 10 is then responsible for performing the defined sequence, without the user needs to intervene.
- a magnetic emission device 300 for non-invasive brain magnetic stimulation according to a second embodiment of FIG. Embodiment of the invention will now be described, again by way of non-limiting example.
- the antenna 102 comprises two identical spirals 302, 302 '(it will be appreciated that in the context of the present invention, the term "identical” includes the case of two mirror spirals one of the other).
- the spirals 302, 302 'each have seven turns.
- the spirals 302, 302 'respectively have central ends S, S' connected to one another and peripheral ends E 7 , E ' 7 . They further extend in parallel planes offset vertically (that is to say, perpendicular to these planes) from each other, to allow the overlap of the spirals 302, 302 'as will be explained later .
- each predefined portion comprises a segment of the first spiral 302 and a segment of the second spiral 302 '.
- the segments of the first coil 302 extend from the same point formed in the example described by the central end S to respectively point E ⁇ ... E 7 (point E 7 being formed by the end device E 7 of the first spiral 302) spaced along the first spiral 302 from the central end S.
- the points S, E 1; ..., E 7 are spaced, along the first spiral 302, substantially one spiral turn from one point to the next.
- the points S and E ⁇ are spaced substantially from a spiral turn
- the points E 1 and E 2 are spaced substantially by one spiral turn, and so on.
- the segments of the second spiral 302 ' extend from the same point formed in the example described by the central end S' to points E ... E ' 7 respectively (point E' 7 being formed by the peripheral end E ' 7 of the second spiral 302') spaced along the second spiral 302 'from the central end S'.
- the points S ', E' 1; ..., E ' 7 are spaced, along the second spiral 302', substantially a spiral turn from one point to the next.
- the points S and E are spaced substantially one turn of a spiral
- the points E i and E '2 are spaced substantially one turn of a spiral, and so on.
- these segments will be denoted SE N for the first spiral 302 and S'-E ' N for the second spiral 302', N varying from one to seven.
- SE N the points S ', E' 15 E ' 7 are located on the second spiral
- each segment of the first spiral 302 corresponds to an identical segment of the second spiral 302 '.
- the segment SE 4 of the first spiral 302 and the segment S'-E ' 4 of the second spiral 302' are identical.
- the means 106 comprise, for each spiral 302, 302 ', a switch 108, respectively 108', designed to selectively connect each of the points E ⁇ ... E 7 of the first spiral 302, respectively each of the points E ⁇ . .. E ' 7 of the second spiral 302', the current generating device 104.
- the current device 104 is connected between the point E ⁇ ... E 7 selected by the switch 108 and the point E ... E ' 7 selected by the switch 108'.
- the control device 1 10 is designed to control the switches 108, 108 'so that each predefined portion has two identical segments respectively belonging to the two spirals 302, 302'. More precisely, the points E 1; EL are connected at the same time to select the first predefined portion, the points E 2 , E 2 'are connected at the same time to select the second predefined portion, and so on.
- the first predetermined portion includes, on the one hand, the SE ⁇ segment of the first coil 302 and, on the other hand, S'-E section of the second coil 302 ', and so on for the other portions predefined.
- the magnetic emission device 300 further comprises a device 304 for relative positioning of the two spirals 302, 302 '.
- the positioning device 304 is designed to translate the spirals 302, 302 'in translation relative to one another in a direction parallel to the planes of the spirals 302, 302'.
- the positioning device 304 can cause the spirals 302, 302 'to overlap.
- control device 1 10 is further adapted to control the positioning device 304 as a function of the selected predefined portion.
- Figure 6 illustrates the case where the fourth predefined portion is selected. This fourth predefined portion comprises segment SE 4 and segment S'-E ' 4 . Then, the spirals 302, 302 'are positioned so that the point E' 4 is as close as possible to the point E 4 . Overlapping spirals, but not active segments (that is, segments of the selected predefined portion) overlap. The active segments are positioned adjacent to each other.
- the magnetic emission device 300 can also be used according to the method 200 of FIG.
- Figure 7 is a graph illustrating the performance of a magnetic emission device similar to that of Figure 1, but using a so-called circular antenna (a single circular spiral, for example as the spiral 302) having sixteen turns.
- a so-called circular antenna a single circular spiral, for example as the spiral 302
- Each antenna is evaluated with respect to a sphere representing a head.
- the ordinate of the graph indicates the depth of action defined as the depth relative to the surface of the sphere at which the electric field resulting from the magnetic field of the antenna is halved compared to its maximum value at the surface of the antenna. the sphere.
- the depth of action is generally called in the literature "D1 / 2".
- the abscissa of the graph indicates the area of action defined as the ratio between the volume of action and the depth of action D1 / 2, the volume of action being the volume of the sphere in which the electric field resulting from the field magnetic of the antenna is greater than the maximum value at the surface of the sphere, divided by two.
- the volume of action is generally called in the literature “V1 / 2” and the action surface is generally called in the literature “S1 / 2".
- the round dots indicate the performance of conventional antennas as evaluated in the article "Electric field depth-focus tradeoff in transcranial magnetic stimulation: simulation comparison of 50 coil designs" by Deng, ZD, Lisanby, SH, & Peterchev, A. V, published in 2013 in the journal Brain Stimulation: Basic, Translational, and Clinical Research in Neuromodulation, 6 (1), 1-13.
- a reference of the form A x is assigned to each round point, where X represents the number assigned to the antenna considered in this article.
- the square points indicate the performance of the antenna of the invention according to the selected predefined portion.
- a reference of the form l T is assigned to each square point, where T represents the number of turns of the selected portion.
- the reference 14 corresponds to a selected portion extending (using the references used for the spiral 302 of FIG. 3) from the point S to the point E4, that is to say extending over the four first turns of the spiral.
- Fig. 8 is a graph similar to the graph of Fig. 7, illustrating the performance of a magnetic emission device similar to that of Fig. 3, but in which the spirals 302; 302 'each have ten turns.
- the second positioning rule active segments overlapping is used.
- Fig. 9 is a graph similar to the graph of Figs. 7 and 8, illustrating the performance of a magnetic emission device similar to that of Fig. 3, but in which the spirals 302; 302 'each have sixteen turns.
- a magnetic emission device makes it possible to effectively replace several antennas of the state of the art.
- a judicious choice of the predefined portions of the antenna makes it possible, by successively selecting carefully selected predefined portions, to follow the same progression of performance (dotted line in FIGS. 7-9) as by changing the antenna of the antenna. state of the art.
- a magnetic transmission device can even replace antennas of the state of the art having different geometries from that of the antenna used in the magnetic emission device according to the invention.
- the antenna used according to the invention for Figure 7 is a circular antenna and the predefined portions are also circular antennas - only changes the number of turns.
- the known antenna A 8 H-coil
- the known antenna A 15 in the form of a Chinese hat
- the known antenna A 41 assembly of five small circular turns - two placed tangentially to the skull and three placed according to the normal to the skull and perpendicular to the first two.
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (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)
- Neurology (AREA)
- Magnetic Treatment Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1853549A FR3080293A1 (fr) | 2018-04-23 | 2018-04-23 | Dispositif d'emission magnetique pour stimulation magnetique cerebrale non invasive et procede d'utilisation d'un tel dispositif |
| PCT/FR2019/050894 WO2019207236A2 (fr) | 2018-04-23 | 2019-04-16 | Dispositif d'emission magnetique pour stimulation magnetique cerebrale non invasive et procede d'utilisation d'un tel dispositif |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3784342A2 true EP3784342A2 (fr) | 2021-03-03 |
Family
ID=63557553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19791449.2A Withdrawn EP3784342A2 (fr) | 2018-04-23 | 2019-04-16 | Dispositif d'emission magnetique pour stimulation magnetique cerebrale non invasive |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US11278733B2 (fr) |
| EP (1) | EP3784342A2 (fr) |
| FR (1) | FR3080293A1 (fr) |
| WO (1) | WO2019207236A2 (fr) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100185042A1 (en) * | 2007-08-05 | 2010-07-22 | Schneider M Bret | Control and coordination of transcranial magnetic stimulation electromagnets for modulation of deep brain targets |
| US20100286470A1 (en) * | 2007-08-05 | 2010-11-11 | Schneider M Bret | Transcranial magnetic stimulation field shaping |
| US20170120065A1 (en) * | 2015-11-04 | 2017-05-04 | Iowa State University Research Foundation, Inc. | Deep transcranial magnetic stimulation apparatus and method |
| US20170368366A1 (en) * | 2016-06-27 | 2017-12-28 | Seraya Medical Systems LLC | Transcranial magnetic stimulation system and methods |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05505750A (ja) * | 1990-08-24 | 1993-08-26 | アニノス,フォティオス | バイオ磁力計の使用に関連して中央神経系の機能不全を円滑にするための電子装置 |
| GB2278783A (en) * | 1993-06-11 | 1994-12-14 | Daniel Shellon Gluck | Method of magnetically stimulating neural cells |
| US20090108969A1 (en) * | 2007-10-31 | 2009-04-30 | Los Alamos National Security | Apparatus and method for transcranial and nerve magnetic stimulation |
| PL3003479T3 (pl) * | 2013-06-03 | 2019-03-29 | Nexstim Oyj | Wielokanałowe urządzenie cewkowe do przezczaszkowej stymulacji magnetycznej z zachodzącymi na siebie uzwojeniami cewkowymi |
| US10307607B2 (en) * | 2016-02-09 | 2019-06-04 | Palo Alto Research Center Incorporated | Focused magnetic stimulation for modulation of nerve circuits |
-
2018
- 2018-04-23 FR FR1853549A patent/FR3080293A1/fr not_active Withdrawn
-
2019
- 2019-04-16 EP EP19791449.2A patent/EP3784342A2/fr not_active Withdrawn
- 2019-04-16 US US17/050,342 patent/US11278733B2/en not_active Expired - Fee Related
- 2019-04-16 WO PCT/FR2019/050894 patent/WO2019207236A2/fr not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100185042A1 (en) * | 2007-08-05 | 2010-07-22 | Schneider M Bret | Control and coordination of transcranial magnetic stimulation electromagnets for modulation of deep brain targets |
| US20100286470A1 (en) * | 2007-08-05 | 2010-11-11 | Schneider M Bret | Transcranial magnetic stimulation field shaping |
| US20170120065A1 (en) * | 2015-11-04 | 2017-05-04 | Iowa State University Research Foundation, Inc. | Deep transcranial magnetic stimulation apparatus and method |
| US20170368366A1 (en) * | 2016-06-27 | 2017-12-28 | Seraya Medical Systems LLC | Transcranial magnetic stimulation system and methods |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2019207236A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019207236A3 (fr) | 2020-10-01 |
| US11278733B2 (en) | 2022-03-22 |
| US20210093881A1 (en) | 2021-04-01 |
| WO2019207236A2 (fr) | 2019-10-31 |
| FR3080293A1 (fr) | 2019-10-25 |
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