WO2017212258A1 - Magnetic stimulation coil arrangement - Google Patents

Magnetic stimulation coil arrangement Download PDF

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Publication number
WO2017212258A1
WO2017212258A1 PCT/GB2017/051646 GB2017051646W WO2017212258A1 WO 2017212258 A1 WO2017212258 A1 WO 2017212258A1 GB 2017051646 W GB2017051646 W GB 2017051646W WO 2017212258 A1 WO2017212258 A1 WO 2017212258A1
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WO
WIPO (PCT)
Prior art keywords
magnetic stimulation
coil arrangement
stimulation coil
arrangement according
housing
Prior art date
Application number
PCT/GB2017/051646
Other languages
French (fr)
Inventor
Matthew BIGINTON
Andrew Clamp
Original Assignee
The Magstim Company Limited
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 The Magstim Company Limited filed Critical The Magstim Company Limited
Priority to GB1818209.7A priority Critical patent/GB2565676B/en
Publication of WO2017212258A1 publication Critical patent/WO2017212258A1/en

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a magnetic stimulation coil arrangement for use in apparatus for magnetic stimulation of tissue, particularly for use in stimulation of the brain using Transcranial Magnetic Stimulation (TMS).
  • TMS Transcranial Magnetic Stimulation
  • a magnetic stimulation apparatus comprises a pulse generator electrically connected to a coil arrangement.
  • the coil arrangement comprises one or more windings (typically two) each comprising a wound elongate conductive element having a plurality of spaced apart turns.
  • the pulse generator is arranged to supply a pulse of high current through the elongate conductive element which has the effect of generating an electromagnetic pulse adjacent the windings which in turn induces relatively small electric currents in the tissue to be treated. It is appreciated that the elongate conductive element could be multi-strand wire, litz wire or comprise a plurality of stacked windings.
  • the temperature of the patient surface ideally should be kept below 41°C. If the patient surface exceeds 41°C for long enough there is the potential for localised heating of tissue.
  • a cooling system typically includes a fluid flowing adjacent to but electrically insulated from the windings. Coolant fluid is passed adjacent the windings during operation transferring heat generated by the current flowing through the windings during operation away from the windings.
  • a magnetic stimulation coil arrangement for use in apparatus for the magnetic stimulation of tissue, the magnetic stimulation coil arrangement comprising an elongate conductive element wound into one or more windings, each of the one or more windings having a plurality of turns and being received in a polymeric formation disposed in a housing, where a coolant flow pathway is defined intermediate the polymeric formation and the housing for enabling cooling of the elongate conductive element, wherein the polymeric formation has a thermal conductivity greater than 0.5 W/mK.
  • This aspect of the present invention provides a magnetic stimulation coil arrangement with improved cooling capability. It will be appreciated that the thermal conductivity is measured through the thickness of the polymeric formation.
  • the polymeric formation beneficially comprises a casing.
  • the casing preferably has a thickness of greater than lmm.
  • the one or more windings may be encapsulated in a potting material to form a potted winding formation, and wherein the potted winding formation is received in the casing.
  • the potting material may be moulded by the casing. This means that the potting material may be poured into the casing containing the one or more windings such that the casing acts as a mould.
  • the potting material preferably has a thermal conductivity of greater than 0.5 W/mK, and preferably greater than 1 W/mK.
  • the potting material may be rubber or epoxy based and may include metallic and/or ceramic fillers.
  • ferromagnetic material may be added which may take the form of particles, grain components or elongates as described for example in GB2360213 or the patent family including US8246529 may be introduced into the potting material in order to enhance the magnetic field on the patient facing side of the coil arrangement.
  • the housing is beneficially a polymeric material having a thermal conductivity of less than 0.5 W/mK. It is beneficial that the housing is not thermally conductive in order that heat is transferred away from the magnetic stimulation coil arrangement via the coolant and does not transfer to the front patient facing side of the coil arrangement nor the rearward operator facing side.
  • the casing may be in the form of a sheath for encasing the elongate conductive element. Accordingly, the elongate conductive element may be sheathed and subsequently wound to form the turns of the winding whereby the turns of the winding are electrically insulated from one another via the sheath.
  • the sheath may define the inner wall of the coolant flow pathway and the housing may define the outer wall of the coolant flow pathway.
  • the coolant flow pathway is beneficially provided above and below the polymeric formation.
  • the coolant flow pathway is preferably further defined between the peripheral edge of the polymeric formation and the housing. This ensures that the cooling effect is maximised.
  • the housing may comprise a head, and the magnetic stimulation coil arrangement may further comprise a coolant source and a neck for transporting coolant to and from the coolant flow pathway. It will be appreciated that the neck also carries the elongate conductive element. The neck is beneficially flexible to allow the head to be manipulated to the correct orientation to accommodate a patient.
  • the coolant may comprise water.
  • the water is beneficially deionised.
  • the coolant may instead be air, oil or flourinert for example.
  • a magnetic stimulation coil arrangement for use is apparatus for the magnetic stimulation of tissue, the magnetic stimulation coil arrangement comprising an elongate conductive element wound into one or more windings, each of the one or more windings having a plurality of turns, the one or more windings being encapsulated in a potting material to form a potted winding formation, the magnetic stimulation coil arrangement further comprising a housing for housing the potted winding formation, wherein the potted winding formation is spaced apart from the housing to define a coolant flow pathway directly between at least a portion of the potted winding formation and the housing.
  • the coolant is in direct communication with the potted winding formation.
  • the housing beneficially comprises a head
  • the magnetic stimulation coil arrangement preferably further comprises a coolant source and a neck for transporting coolant to and from the coolant flow pathway.
  • the coolant beneficially comprises oil.
  • the oil is beneficially electrically inert. In the event that the potting material fractures due to fatigue for example the oil may leak to come into contact with the one or windings. As the oil is inert the operation of the magnetic stimulation coil arrangement may be continued without significant risk to a patient.
  • the oil may comprise flourinert.
  • the potting material may be rubber or epoxy based and may include metallic and/or ceramic fillers.
  • ferromagnetic material may be added which may take the form of particles, grain components or elongates as described for example in GB2360213 or the patent family including US8246529 may be introduced into potting material in order to enhance the magnetic field on the patient facing side.
  • the potting material preferably has a thermal conductivity of greater than 0.5 W/mK, and preferably greater than 1 W/mK.
  • the coolant flow pathway is beneficially defined above and below the potted winding formation.
  • Above the potted winding formation may be defined as a front patient facing side and below the potting winding formation may be defined as the rearward or operator facing side.
  • the coolant flow pathway is beneficially further defined between the peripheral edge of the polymeric formation and the housing.
  • the peripheral edge may be defined between the front patient facing side and rearward operator facing side.
  • the one or more windings are typically planar but could be wound or formed as batwing, cone, clover or angled coil to name a few of the plethora of coil shapes and geometries that exist.
  • the patient facing side of the housing may typically be of a concave profile to accommodate the anatomy of the patient.
  • Figure la is a schematic representation of a known magnetic stimulator coil system
  • Figure lb is a schematic representation of a double winding typically used for TMS treatment.
  • Figure 2 is a schematic cross sectional view of a magnetic stimulation coil arrangement according to an exemplary embodiment of the present invention.
  • Figure 3 is a schematic cross sectional representation of a magnetic stimulation coil arrangement according to an exemplary embodiment of the present invention.
  • Figure 4 is a further schematic cross sectional representation of a magnetic stimulation coil arrangement according to an exemplary embodiment of the present invention.
  • Figure 5 is a further schematic cross sectional representation of a magnetic stimulation coil arrangement according to an exemplary embodiment of the present invention.
  • a housing (2) is provided to accommodate a pulse generator, a pump and reservoir for transferring coolant through the neck (4) to the head (6).
  • the head (6) which houses in this exemplary embodiment a single winding (8). Coolant is pumped from the housing to the head (6) in order to cool the winding (8) upon discharge of current therethrough.
  • FIG lb is a schematic representation of a double winding typically used in TMS treatment.
  • An elongate conductive element (10) is wound to form a first and second winding (12, 14).
  • FIG 2 there is a schematic cross sectional representation of an exemplary embodiment of the present invention.
  • a magnetic stimulation coil arrangement (14) comprising a single winding (8).
  • the core of the winding (8) is represented by reference number (16).
  • the winding (8) is potted within a potting material (18) which may be rubber or epoxy based.
  • the potting material (18) is in turn disposed in a polymeric formation (20) which is shown in the form of a casing.
  • the casing (20) effectively houses the winding (8) and potting material (18).
  • a coolant flow pathway (22) having an inlet (24) and outlet (26). Coolant flows through the inlet (24) and around the coolant flow pathway (22) and exits the magnetic stimulation coil arrangement (14) via the outlet (26) for transfer back to the coolant supply in the housing (2). Retaining the coolant flowing about the casing (20) is a housing (28).
  • the potting material (18) provides electrical insulation to the winding (8) and also provides strength to the magnetic stimulation coil arrangement.
  • the potting material (18) also draws heat from the coil windings and as such preferably has a thermal conductivity greater than 0.5 W/mK and preferably greater than 1 W/mK.
  • the casing (20) is formed of a thermally conductive plastic having a thermal conductivity of greater than 1 W/mK.
  • a thermally conductive plastic having thermal conductivity of between 1 and 20 W/mK maintains the required electrical insulation properties.
  • the thickness of the casing (20) is preferably in the order of 1mm. Use of this thermally conductive plastic enables efficient heat transfer from the windings (8) to the coolant flowing in the coolant flow pathway (22) and thus heat is effectively transferred away from the winding (8).
  • the coolant is beneficially deionised water. It will be appreciated that oil may also be utilised, or flourinert and possibly air.
  • the housing (28) may comprise a polymeric material having relatively low thermal conductivity. It is beneficial that heat is not transferred through the housing (28) to the patient or operator. It will be appreciated that the external shape of the housing (28) may be formed to accommodate the anatomy of a patient.
  • FIG. 2 a single winding (8) has been shown in Figure 2. As is typical in TMS treatment, a double winding as shown in Figure lb may be utilised.
  • FIG 3 a further exemplary embodiment of the present invention is presented.
  • individual turns (30) of winding (8) are individually housed in a sheath (32).
  • the coolant flow pathway is external of the sheath (32) and is defined at its exterior by the housing (28).
  • the elongate conductive element wound to form the winding (8) is sheathed and subsequently wound to form the sheathed winding as shown in Figure 3.
  • the sheath (32) has thermal conductivity of greater than 0.5 W/mK, and preferably greater than 1 W/mK.
  • FIG. 4 a further exemplary embodiment of the present invention is presented.
  • the winding (8) is encapsulated in a potting material (18).
  • the coolant flow pathway is defined between the external surface of the potting material (18) having the winding (8) therein and the internal surface of the housing (28).
  • an inert coolant is utilised in the form of an inert oil for example.
  • FIG 5 a further exemplary embodiment of the present invention is presented.
  • the winding (8) is encapsulated in a potting material (18).
  • the casing (20) is partial and instead forms a tray around the potting material (18).
  • the coolant flows both around the casing (20) and the potting material (18).
  • the windings (8) may be disposed directly against the casing (20)

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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)
  • Magnetic Treatment Devices (AREA)

Abstract

The present invention relates to a magnetic stimulation coil arrangement particularly for use in stimulation of the brain using Transcranial Magnetic Stimulation (TMS). According to one aspect of the invention there is a magnetic stimulation coil arrangement for use in apparatus for the magnetic stimulation of tissue, the magnetic stimulation coil arrangement comprising an elongate conductive element wound into one or more windings, each of the one or more windings having a plurality of turns, the one or more windings being encapsulated in a potting material to form a potted winding formation, the magnetic stimulation coil arrangement further comprising a housing for housing the potted winding formation, wherein the potted winding formation is spaced apart from the housing to define a coolant flow pathway directly between at least a portion of the potted winding formation and the housing.

Description

Magnetic Stimulation Coil Arrangement
The present invention relates to a magnetic stimulation coil arrangement for use in apparatus for magnetic stimulation of tissue, particularly for use in stimulation of the brain using Transcranial Magnetic Stimulation (TMS).
A magnetic stimulation apparatus comprises a pulse generator electrically connected to a coil arrangement. The coil arrangement comprises one or more windings (typically two) each comprising a wound elongate conductive element having a plurality of spaced apart turns. The pulse generator is arranged to supply a pulse of high current through the elongate conductive element which has the effect of generating an electromagnetic pulse adjacent the windings which in turn induces relatively small electric currents in the tissue to be treated. It is appreciated that the elongate conductive element could be multi-strand wire, litz wire or comprise a plurality of stacked windings.
A problem exists in that passing a high current through the elongate conductive element causes a significant amount of heat to be generated by joule heating. This heat transfers from the windings through the surrounding media and to the patient surface of the coil arrangement. The temperature of the patient surface ideally should be kept below 41°C. If the patient surface exceeds 41°C for long enough there is the potential for localised heating of tissue.
Accordingly a cooling system is provided which typically includes a fluid flowing adjacent to but electrically insulated from the windings. Coolant fluid is passed adjacent the windings during operation transferring heat generated by the current flowing through the windings during operation away from the windings.
Whilst known cooling systems take heat away from the windings, it is desirable to operate the magnetic stimulation coil apparatus at higher power protocols with reduced time delay between pulses. This has the effect that more heat must be transferred away from the windings in order to avoid the patient surface exceeding 41°C. An improved arrangement has been devised.
According to one aspect of the present invention there is a magnetic stimulation coil arrangement for use in apparatus for the magnetic stimulation of tissue, the magnetic stimulation coil arrangement comprising an elongate conductive element wound into one or more windings, each of the one or more windings having a plurality of turns and being received in a polymeric formation disposed in a housing, where a coolant flow pathway is defined intermediate the polymeric formation and the housing for enabling cooling of the elongate conductive element, wherein the polymeric formation has a thermal conductivity greater than 0.5 W/mK.
This aspect of the present invention provides a magnetic stimulation coil arrangement with improved cooling capability. It will be appreciated that the thermal conductivity is measured through the thickness of the polymeric formation. The polymeric formation beneficially comprises a casing. The casing preferably has a thickness of greater than lmm.
The one or more windings may be encapsulated in a potting material to form a potted winding formation, and wherein the potted winding formation is received in the casing. In order to improve manufacturing capability, the potting material may be moulded by the casing. This means that the potting material may be poured into the casing containing the one or more windings such that the casing acts as a mould. The potting material preferably has a thermal conductivity of greater than 0.5 W/mK, and preferably greater than 1 W/mK. The potting material may be rubber or epoxy based and may include metallic and/or ceramic fillers. Alternatively or in addition ferromagnetic material may be added which may take the form of particles, grain components or elongates as described for example in GB2360213 or the patent family including US8246529 may be introduced into the potting material in order to enhance the magnetic field on the patient facing side of the coil arrangement. The housing is beneficially a polymeric material having a thermal conductivity of less than 0.5 W/mK. It is beneficial that the housing is not thermally conductive in order that heat is transferred away from the magnetic stimulation coil arrangement via the coolant and does not transfer to the front patient facing side of the coil arrangement nor the rearward operator facing side.
The casing may be in the form of a sheath for encasing the elongate conductive element. Accordingly, the elongate conductive element may be sheathed and subsequently wound to form the turns of the winding whereby the turns of the winding are electrically insulated from one another via the sheath. The sheath may define the inner wall of the coolant flow pathway and the housing may define the outer wall of the coolant flow pathway.
The coolant flow pathway is beneficially provided above and below the polymeric formation. The coolant flow pathway is preferably further defined between the peripheral edge of the polymeric formation and the housing. This ensures that the cooling effect is maximised.
The housing may comprise a head, and the magnetic stimulation coil arrangement may further comprise a coolant source and a neck for transporting coolant to and from the coolant flow pathway. It will be appreciated that the neck also carries the elongate conductive element. The neck is beneficially flexible to allow the head to be manipulated to the correct orientation to accommodate a patient.
The coolant may comprise water. The water is beneficially deionised. The coolant may instead be air, oil or flourinert for example.
According to an alternative aspect of the present invention there is a magnetic stimulation coil arrangement for use is apparatus for the magnetic stimulation of tissue, the magnetic stimulation coil arrangement comprising an elongate conductive element wound into one or more windings, each of the one or more windings having a plurality of turns, the one or more windings being encapsulated in a potting material to form a potted winding formation, the magnetic stimulation coil arrangement further comprising a housing for housing the potted winding formation, wherein the potted winding formation is spaced apart from the housing to define a coolant flow pathway directly between at least a portion of the potted winding formation and the housing. Thus, the coolant is in direct communication with the potted winding formation.
The housing beneficially comprises a head, and the magnetic stimulation coil arrangement preferably further comprises a coolant source and a neck for transporting coolant to and from the coolant flow pathway. The coolant beneficially comprises oil. The oil is beneficially electrically inert. In the event that the potting material fractures due to fatigue for example the oil may leak to come into contact with the one or windings. As the oil is inert the operation of the magnetic stimulation coil arrangement may be continued without significant risk to a patient. The oil may comprise flourinert.
The potting material may be rubber or epoxy based and may include metallic and/or ceramic fillers. Alternatively or in addition ferromagnetic material may be added which may take the form of particles, grain components or elongates as described for example in GB2360213 or the patent family including US8246529 may be introduced into potting material in order to enhance the magnetic field on the patient facing side.
The potting material preferably has a thermal conductivity of greater than 0.5 W/mK, and preferably greater than 1 W/mK.
The coolant flow pathway is beneficially defined above and below the potted winding formation. Above the potted winding formation may be defined as a front patient facing side and below the potting winding formation may be defined as the rearward or operator facing side. The coolant flow pathway is beneficially further defined between the peripheral edge of the polymeric formation and the housing. The peripheral edge may be defined between the front patient facing side and rearward operator facing side. It will be appreciated that the windings according to either aspect comprise a plurality of turns and are beneficially wound radially. They may be wound in either anti-clockwise or clockwise directions. The one or more windings are typically planar but could be wound or formed as batwing, cone, clover or angled coil to name a few of the plethora of coil shapes and geometries that exist. The patient facing side of the housing may typically be of a concave profile to accommodate the anatomy of the patient.
Aspects of the present invention will now be described by way of example only with reference to the accompanying drawings in which: Figure la is a schematic representation of a known magnetic stimulator coil system and Figure lb is a schematic representation of a double winding typically used for TMS treatment.
Figure 2 is a schematic cross sectional view of a magnetic stimulation coil arrangement according to an exemplary embodiment of the present invention.
Figure 3 is a schematic cross sectional representation of a magnetic stimulation coil arrangement according to an exemplary embodiment of the present invention. Figure 4 is a further schematic cross sectional representation of a magnetic stimulation coil arrangement according to an exemplary embodiment of the present invention.
Figure 5 is a further schematic cross sectional representation of a magnetic stimulation coil arrangement according to an exemplary embodiment of the present invention.
Referring to Figure la a schematic representation of an existing magnetic stimulation coil system is presented. A housing (2) is provided to accommodate a pulse generator, a pump and reservoir for transferring coolant through the neck (4) to the head (6). The head (6) which houses in this exemplary embodiment a single winding (8). Coolant is pumped from the housing to the head (6) in order to cool the winding (8) upon discharge of current therethrough.
Figure lb is a schematic representation of a double winding typically used in TMS treatment. An elongate conductive element (10) is wound to form a first and second winding (12, 14). Referring now to Figure 2 there is a schematic cross sectional representation of an exemplary embodiment of the present invention. Referring to Figure 2 there is a magnetic stimulation coil arrangement (14) comprising a single winding (8). The core of the winding (8) is represented by reference number (16). In this embodiment the winding (8) is potted within a potting material (18) which may be rubber or epoxy based. The potting material (18) is in turn disposed in a polymeric formation (20) which is shown in the form of a casing. The casing (20) effectively houses the winding (8) and potting material (18). Outwardly of the casing (20) is a coolant flow pathway (22) having an inlet (24) and outlet (26). Coolant flows through the inlet (24) and around the coolant flow pathway (22) and exits the magnetic stimulation coil arrangement (14) via the outlet (26) for transfer back to the coolant supply in the housing (2). Retaining the coolant flowing about the casing (20) is a housing (28).
The potting material (18) provides electrical insulation to the winding (8) and also provides strength to the magnetic stimulation coil arrangement. The potting material (18) also draws heat from the coil windings and as such preferably has a thermal conductivity greater than 0.5 W/mK and preferably greater than 1 W/mK.
The casing (20) is formed of a thermally conductive plastic having a thermal conductivity of greater than 1 W/mK. A thermally conductive plastic having thermal conductivity of between 1 and 20 W/mK maintains the required electrical insulation properties. The thickness of the casing (20) is preferably in the order of 1mm. Use of this thermally conductive plastic enables efficient heat transfer from the windings (8) to the coolant flowing in the coolant flow pathway (22) and thus heat is effectively transferred away from the winding (8).
In the embodiment as presented in Figure 2, the coolant is beneficially deionised water. It will be appreciated that oil may also be utilised, or flourinert and possibly air.
The housing (28) may comprise a polymeric material having relatively low thermal conductivity. It is beneficial that heat is not transferred through the housing (28) to the patient or operator. It will be appreciated that the external shape of the housing (28) may be formed to accommodate the anatomy of a patient.
It will be appreciated that a single winding (8) has been shown in Figure 2. As is typical in TMS treatment, a double winding as shown in Figure lb may be utilised. Referring to Figure 3 a further exemplary embodiment of the present invention is presented. In this embodiment individual turns (30) of winding (8) are individually housed in a sheath (32). The coolant flow pathway is external of the sheath (32) and is defined at its exterior by the housing (28). The elongate conductive element wound to form the winding (8) is sheathed and subsequently wound to form the sheathed winding as shown in Figure 3. The sheath (32) has thermal conductivity of greater than 0.5 W/mK, and preferably greater than 1 W/mK.
Referring to Figure 4, a further exemplary embodiment of the present invention is presented. In this embodiment the winding (8) is encapsulated in a potting material (18). However in this embodiment the coolant flow pathway is defined between the external surface of the potting material (18) having the winding (8) therein and the internal surface of the housing (28). In such an embodiment an inert coolant is utilised in the form of an inert oil for example. Referring to Figure 5, a further exemplary embodiment of the present invention is presented. In this embodiment the winding (8) is encapsulated in a potting material (18). However in this embodiment the casing (20) is partial and instead forms a tray around the potting material (18). The coolant flows both around the casing (20) and the potting material (18). In addition in this example the windings (8) may be disposed directly against the casing (20)
Aspects of the present invention have been described by way of example only and it will be appreciated to the skilled addressee that modifications and variations may be made without departing from the scope of protection afforded by the appended claims.

Claims

Claims
1. A magnetic stimulation coil arrangement for use in apparatus for the magnetic stimulation of tissue, the magnetic stimulation coil arrangement comprising an elongate conductive element wound into one or more windings, each of the one or more windings having a plurality of turns, the one or more windings being encapsulated in a potting material to form a potted winding formation, the magnetic stimulation coil arrangement further comprising a housing for housing the potted winding formation, wherein the potted winding formation is spaced apart from the housing to define a coolant flow pathway directly between at least a portion of the potted winding formation and the housing.
2. A magnetic stimulation coil arrangement according to claim 1 wherein the housing comprises a head and the magnetic stimulation coil arrangement further comprises a coolant source and a neck for transporting coolant to and from the coolant flow pathway.
3. A magnetic stimulation coil arrangement according to claim 2 wherein the coolant comprises oil.
4. A magnetic stimulation coil arrangement according to claim 1 wherein the coolant comprises flourinert.
5. A magnetic stimulation coil arrangement according to any preceding claim wherein the potting material is rubber or epoxy based.
6. A magnetic stimulation coil arrangement according to any preceding claim wherein the potting material has a thermal conductivity of greater than 0.5 W/mK, and preferably greater than 1 W/mK.
7. A magnetic stimulation coil arrangement according to any of the claims 1 to 5
wherein the potting material includes metallic and/or ceramic fillers therein.
8. A magnetic stimulation coil arrangement according to any preceding claim wherein the coolant flow pathway is defined above and below the potted winding formation.
9. A magnetic stimulation coil arrangement according to claim 8 wherein the coolant flow pathway is further defined between the peripheral edge of the polymeric formation and the housing.
10. A magnetic stimulation coil arrangement according to any preceding claim wherein the potted winding formation is received in a polymeric tray.
11. A magnetic stimulation coil arrangement according to claim 10 wherein the tray has a thermal conductivity greater than 0.5 W/mK.
12. A magnetic stimulation coil arrangement according to any preceding claim wherein the housing is a polymeric material having a thermal conductivity of less than 0.5 W/mK.
13. A magnetic stimulation coil arrangement for use in apparatus for the magnetic
stimulation of tissues, the magnetic stimulation coil arrangement comprising an elongate conductive element wound into one or more windings, each of the one or more windings having a plurality of turns and being received in a polymeric formation disposed in a housing, where a coolant flow pathway is defined intermediate the polymeric formation and the housing for enabling cooling of the elongate conductive element, wherein the polymeric formation has a thermal conductivity greater than 0.5 W/mK.
14. A magnetic stimulation coil arrangement according to claim 13 wherein the
polymeric formation has a thermal conductivity of greater than 1 W/mK.
15. A magnetic stimulation coil arrangement according to any of claims 13 to 14 wherein the polymeric formation comprises a casing.
16. A magnetic stimulation coil arrangement according to claim 15 wherein the one or more windings are encapsulated in a potting material to form a potted winding formation, and wherein the potting winding formation is received in the casing.
17. A magnetic stimulation coil arrangement according to claim 16 wherein the potting material is moulded by the casing.
18. A magnetic stimulation coil arrangement according to any of claims 16 to 17 wherein the potting material has a thermal conductivity of greater than 0.5 W/mK and preferably greater than 1 W/mK.
19. A magnetic stimulation coil arrangement according to any of claims 13 to 18 wherein the housing is a polymeric material having a thermal conductivity of less than 0.5 W/mK.
20. A magnetic stimulation coil arrangement according to any of claims 13 to 16 wherein the casing is in the form of a sheath for encasing the elongate conductive element.
21. A magnetic stimulation coil arrangement according to claim 20 wherein the sheath defines the inner wall of the coolant flow pathway and the housing defines the outer wall of the coolant flow pathway.
22. A magnetic stimulation coil arrangement according to any of claims 13 to 21 wherein the coolant flow pathway is above and below the polymeric formation.
23. A magnetic stimulation coil arrangement according to claim 22 wherein the coolant flow pathway is further defined between the peripheral edge of the polymeric formation and the housing.
24. A magnetic stimulation coil arrangement according to any of claims 13 to 22 wherein the housing comprises a head, and the magnetic stimulation coil arrangement further comprises a coolant source and a neck for transporting coolant to and from the coolant flow pathway.
25. A magnetic stimulation coil arrangement according to claim 24 wherein the coolant comprises water, preferably de-ionised water.
PCT/GB2017/051646 2016-06-08 2017-06-07 Magnetic stimulation coil arrangement WO2017212258A1 (en)

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Application Number Priority Date Filing Date Title
GB1818209.7A GB2565676B (en) 2016-06-08 2017-06-07 Magnetic stimulation coil arrangement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1609980.6 2016-06-08
GBGB1609980.6A GB201609980D0 (en) 2016-06-08 2016-06-08 Magnetic stimulation coil arrangement

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Cited By (9)

* Cited by examiner, † Cited by third party
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WO2022196914A1 (en) * 2021-03-15 2022-09-22 주식회사 에이티앤씨 Coil body of transcranial stimulator and transcranial stimulator
US11794029B2 (en) 2016-07-01 2023-10-24 Btl Medical Solutions A.S. Aesthetic method of biological structure treatment by magnetic field
US11806528B2 (en) 2020-05-04 2023-11-07 Btl Healthcare Technologies A.S. Device and method for unattended treatment of a patient
US11826565B2 (en) 2020-05-04 2023-11-28 Btl Healthcare Technologies A.S. Device and method for unattended treatment of a patient
US11878162B2 (en) 2016-05-23 2024-01-23 Btl Healthcare Technologies A.S. Systems and methods for tissue treatment
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US11896816B2 (en) 2021-11-03 2024-02-13 Btl Healthcare Technologies A.S. Device and method for unattended treatment of a patient
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US11883643B2 (en) 2016-05-03 2024-01-30 Btl Healthcare Technologies A.S. Systems and methods for treatment of a patient including RF and electrical energy
US11878162B2 (en) 2016-05-23 2024-01-23 Btl Healthcare Technologies A.S. Systems and methods for tissue treatment
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US12076576B2 (en) 2019-04-11 2024-09-03 Btl Medical Solutions A.S. Methods and devices for aesthetic treatment of biological structures by radiofrequency and magnetic energy
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