Coil assemblies for magnetic stimulators

• US 6,179,770 B1
• Filed: 04/16/1999
• Issued: 01/30/2001
• Est. Priority Date: 04/25/1998
• Status: Active Grant

• Current Assignee: The Magstim Company Limited (Magstim Group, Incorporated)
• Original Assignee: The Magstim Company Limited (Magstim Group, Incorporated)
• Inventors: Mould, Stephen
• Primary Examiner(s): Lacyk, John P.
• Application Number:
  US09/293,061
• Time in Patent Office: 655 Days
• Field of Search: 600/9-15
• US Class Current: 600/13
• CPC Class Codes: A61N 2/006 for magnetic stimulation of nerve tissue
• CPC Class Codes: A61N 2/02 using magnetic fields produced by coils, including single turn loops or electromagnets A61N2/12 takes precedence

Abstract

A magnetic stimulator for neuro-muscular tissue uses a stimulating coil and generates a succession of electrical discharge pulses from the coil to produce magnetic pulses which induce electrical signals in the tissue. The coil has at least one set of generally circular turns, and is disposed within a casing connected to a conduit through which extend cables for the supply of electrical power to the coil. The conduit and casing allow for the flow of gaseous coolant around and over exposed surfaces of the coil, though the casing and along the conduit.

Claims

1. A magnetic stimulator for neuro-muscular tissue, said stimulator comprising:

a stimulating coil and means for generating a succession of electrical discharge pulses of said coil to produce magnetic pulses for the inducement of electrical signals in the tissue,

wherein the coil has at least one set of generally circular turns, and is disposed within a casing connected to a conduit through which extend cables for the supply of electrical power to the coil, and

wherein the conduit and casing include an inlet and an outlet for a gaseous coolant and allow for the flow of gaseous coolant around and over exposed surfaces of the coil, through the casing and along the conduit.

2. A magnetic stimulator coil assembly as in claim 1 wherein:

said coil has the form of a figure of eight including two sets of generally circular turns, and

the casing has a form of generally a figure of eight including a side extension, cables for the coil extending through the side extension.

3. A magnetic stimulator for neuro-muscular tissue, said stimulator comprising:

a stimulating coil and means for generating a succession of electrical discharge pulses in said coil to produce magnetic pulses for the inducement of electrical signals in the tissue,

said coil being in the form of a figure of eight including two sets of generally circular turns;

a casing for said coil, said casing comprising a top cover in a generally figure of eight form having a side extension, a bottom cover similar to said top cover being in generally figure of eight form having a respective side extension,

said top cover and bottom cover defining holes encircled by the respective set of turns; and

filter assemblies each disposed in a respective one of said holes, said filter assemblies each allowing air to pass into the housing and over the coil.

4. A magnetic stimulator for neuro-muscular tissue, said stimulator comprising:

an elongated tubular member having proximal and distal ends;

at least one electromagnetic coil disposed in a housing at the distal end of said tubular member and in fluid communication with the tubular member;

electrical current supply conductors connected to said coil and extending therefrom within said tubular member towards its proximal end;

at least one gaseous cooling fluid inlet disposed in said housing proximate said coil; and

a gaseous cooling fluid outlet disposed towards the proximal end of said tubular member;

whereby gaseous cooling fluid may be caused to flow about said coil and supply conductors within and through said housing and tubular member.

5. A magnetic stimulator as in claim 4 further comprising:

a gaseous cooling fluid filter disposed in said at least one inlet of the housing.

6. A magnetic stimulator as in claim 4 wherein:

the coil comprises adjacent circular sections of coil windings around in a figure eight configuration; and

the housing has at least one gaseous cooling fluid inlet disposed within the center of each said circular section.

7. A magnetic stimulator as in claim 5 further comprising a gaseous cooling fluid filter disposed in each inlet of the housing.

8. A magnetic stimulator as in claim 4 wherein said electrical conductors are connected to a fluid tight electrical connector disposed along said tubular member before the proximal end and fluid outlet of the tubular member.

9. A magnetic stimulator as in claim 4 wherein said housing is formed of two split housing half-sections held together with fasteners engaging the at least one fluid inlet of the housing.