Protective assembly
First Claim
1. An assembly for protecting biological tissue from the effects of heating comprising a conductor in contact with said biological tissue and forming an electrical circuit comprising said biological tissue, wherein said assembly is comprised of means for modifying the impedance of said electrical circuit such that, at a frequency of from about 20 megahertz to about 150 megahertz, said impedance is at least about 0.5 ohms per centimeter of length of said conductor, and wherein said assembly is comprised of means for limiting the flow of current through said tissue such that, when said assembly is exposed to an alternating electromagnetic wave at a frequency of 64 megahertz and a direct current magnetic field strength of 1.5 Tesla for at least about 15 minutes, the temperature of said biological tissue does not exceed 42 degrees Celsius.
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Accused Products
Abstract
An assembly for protecting biological tissue from the effects of heating. The assembly contains a conductor in contact with the biological tissue and forming an electrical circuit comprising the biological tissue. The assembly contains a device for modifying the impedance of the electrical circuit such that, at a frequency of from about 10 megahertz to about 150 megahertz, such impedance is at least about 0.5 ohms per centimeter of length of said conductor. The assembly also contains a device for limiting the flow of current through the biological tissue such that, when the assembly is exposed to an alternating current electromagnetic field at a frequency of 64 megahertz and a magnetic field strength of 1.5 Tesla for 15 minutes, the temperature of the biological tissue does not exceed 42 degrees Celsius.
248 Citations
45 Claims
- 1. An assembly for protecting biological tissue from the effects of heating comprising a conductor in contact with said biological tissue and forming an electrical circuit comprising said biological tissue, wherein said assembly is comprised of means for modifying the impedance of said electrical circuit such that, at a frequency of from about 20 megahertz to about 150 megahertz, said impedance is at least about 0.5 ohms per centimeter of length of said conductor, and wherein said assembly is comprised of means for limiting the flow of current through said tissue such that, when said assembly is exposed to an alternating electromagnetic wave at a frequency of 64 megahertz and a direct current magnetic field strength of 1.5 Tesla for at least about 15 minutes, the temperature of said biological tissue does not exceed 42 degrees Celsius.
- 7. An assembly for protecting biological tissue from the effects of heating comprising a conductor in contact with said biological tissue and forming an electrical circuit comprising said biological tissue, wherein said assembly is comprised of means for limiting the flow of current through said tissue such that, when said assembly is exposed to an alternating electromagnetic wave at a frequency of 64 megahertz and a direct current magnetic field strength of from about 1.5 Tesla for at least about 15 minutes, the temperature of said biological tissue does not exceed 39 degrees Celsius, wherein said assembly is a magnetically shielded assembly comprised of a medical device implanted in a biological organism, wherein said medical device is disposed near said biological tissue, and wherein said magnetically shielded assembly is comprised of a magnetic shield disposed on at least a portion of said medical device.
- 22. An assembly for protecting biological tissue from the effects of induced voltages produced by high frequency electromagnetic radiation, wherein said assembly comprises a conductor and pulse generator in contact with said biological tissue and forming an electrical induction loop comprising said biological tissue, wherein said assembly is comprised of a magnetic shield disposed between said high frequency electromagnetic radiation and said conductor, and wherein said assembly is comprised of means for limiting the voltage induced in said electrical induction loop such that, when said high frequency electromagnetic radiation contacts said assembly, said induced voltage is less than about 0.5 volts.
- 33. An assembly for protecting biological tissue from the effects of induced voltages produced by high frequency electromagnetic radiation, wherein said assembly comprises a medical device in contact with said biological tissue and forming an electrical induction loop comprising said biological tissue, wherein said assembly is comprised of a magnetic shield disposed between said high frequency electromagnetic radiation and said medical device, and wherein said assembly is comprised of means for limiting the voltage induced in said electrical induction loop such that, when said high frequency electromagnetic radiation contacts said assembly, said induced voltage is less than about 0.5 volts.
Specification