Magnetic stimulators and stimulating coils
A stimulating coil for use in the magnetic stimulation of neuro-muscular tissue comprises a self-supporting but flexible conductor in a flexible insulating sheath which can be adjusted by hand to conform the coil to the contours of a selected part of the human body. The coil is provided with a cooling system which includes a conduit disposed adjacent or within the coil and a pump for driving coolant through the conduit.
1. A magnetic stimulator for the magnetic stimulation of neuro-muscular tissue and comprising;
a stimulating coil;
a charging circuit;
a capacitor; and
a discharge control for allowing discharge of the capacitor through the stimulating coil; wherein the stimulating coil comprises a flexible conductor enclosed in a flexible tube, the flexible tube for allowing the passage of coolant, the stimulating coil being in a flexible insulating sheath having a generally flat disc shape which can be adjusted by hand to conform the coil to the contours of a selected part of the human body, said flexible conductor and flexible tube being wound into a multiple turn coil in which the turns are disposed to lie generally in a common plane and are supported by the flexible sheath in that plane, and wherein the stimulator further comprises a pump for driving coolant through the flexible tube.
2. A stimulator as in claim 1 wherein said sheath includes at least one sensor for sensing the temperature of the coil, and said sensor is coupled to prevent current flow through the coil on the detection of a temperature above a limit.
3. A stimulator as in claim 1 wherein the flexible tube is connected to a heat exchanger and said pump is connected to recirculate the coolant through the heat exchanger and the flexible tube.
4. A stimulator as in claim 1 wherein said coolant is a liquid of high thermal conductivity and low electrical conductivity.
5. A stimulator as in claim 1 wherein said coolant comprises water.
6. A stimulator as in claim 1 wherein said sheath is plastically flexible.
7. A stimulator as in claim 1 wherein said sheath is elastically flexible.