Apparatus for creating therapeutic charge transfer in tissue
First Claim
1. An apparatus for creating therapeutic charge transfer in tissue, comprising:
- a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue, said magnetic field having a growth phase and a decay phase, a duration of the growth phase being at least ten times a duration of the decay phase; and
a control circuit controlling a current fed to said coil, said control circuit including two subcircuits and a switch for switching between a first of said subcircuits and a second of said subcircuits, said first of said subcircuits causing said growth phase, said second of said subcircuits causing said decay phase;
each one of said subcircuits having a respective time constant (λ
) equaling an inductance (L) divided by a resistance (R) of said respective one of said subcircuits; and
said λ
of said second subcircuit being at least ten times said λ
of said first subcircuit.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for creating therapeutic charge transfer in tissue includes a coil. The coil generates a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when the coil is 5 cm from the tissue. Preferably, the magnetic field has a growth phase and a decay phase and a duration of the growth phase is at least ten times a duration of the decay phase. The apparatus can include a control circuit to control a current fed to the coil. The control circuit includes two subcircuits and a switch for switching between a first of the subcircuits and a second of the subcircuits; preferably, a λ of the second subcircuit is at least ten times a λ of the first subcircuit. To generate the therapeutic effect, the coil should have a duty cycle of at least ten percent.
-
Citations
26 Claims
-
1. An apparatus for creating therapeutic charge transfer in tissue, comprising:
-
a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue, said magnetic field having a growth phase and a decay phase, a duration of the growth phase being at least ten times a duration of the decay phase; and a control circuit controlling a current fed to said coil, said control circuit including two subcircuits and a switch for switching between a first of said subcircuits and a second of said subcircuits, said first of said subcircuits causing said growth phase, said second of said subcircuits causing said decay phase; each one of said subcircuits having a respective time constant (λ
) equaling an inductance (L) divided by a resistance (R) of said respective one of said subcircuits; andsaid λ
of said second subcircuit being at least ten times said λ
of said first subcircuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An apparatus for creating therapeutic charge transfer in tissue, comprising:
-
a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue, said magnetic field having a growth phase and a decay phase, a duration of the growth phase being at least ten times a duration of the decay phase; and a control circuit controlling a current fed to said coil, said control circuit including two subcircuits and a switch for switching between a first of said subcircuits and a second of said subcircuits, said first of said subcircuits causing said growth phase, said second of said subcircuits causing said decay phase; said second subcircuit having a time constant (λ
) no less than 10, λ
being calculated by dividing a resistance (R) of said second subcircuit by an inductance (L) of said second subcircuit.
-
-
10. An apparatus for creating therapeutic charge transfer in tissue, comprising:
-
a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue, said magnetic field having a growth phase and a decay phase, a duration of the growth phase being at least ten times a duration of the decay phase; and a control circuit controlling a current fed to said coil, said control circuit including two subcircuits and a switch for switching between a first of said subcircuits and a second of said subcircuits, said first of said subcircuits causing said growth phase, said second of said subcircuits causing said decay phase; said second subcircuit including an Integrated Gate Bipolar Transistor (IGBT) for increasing a resistance of said second subcircuit.
-
- 11. An apparatus for creating therapeutic charge transfer in tissue, comprising a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue, said coil having a duty cycle of at least ten percent.
-
13. A method for magnetically inducting an electrical field in tissue to create therapeutic charge transfer in the tissue, which comprises:
-
providing an apparatus for creating therapeutic charge transfer in tissue, comprising a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue; increasing the magnetic field in said coil linearly over time to induct an electrical field having a first direction in the tissue for a first period of time; and decreasing the magnetic field linearly over time to induct an electrical field having a second direction opposite said first direction in the tissue for a second period time, the second period of time being different than said first period of time. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
-
21. A method for magnetically inducting an electrical field in tissue to create therapeutic charge transfer in the tissue, which comprises:
-
providing an apparatus for creating therapeutic charge transfer in tissue, comprising a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue; increasing the magnetic field in said coil steadily to induct an electrical field having a first direction in the tissue for a first period of time varying less than 10% in intensity for at least 90% of said first period of time; and decreasing the magnetic field to induct an electrical field having a second direction opposite said first direction in the tissue for a second period time, the second period of time being different than said first period of time.
-
-
22. A method for magnetically inducting an electrical field in tissue to create therapeutic charge transfer in the tissue, which comprises:
-
providing an apparatus for creating therapeutic charge transfer in tissue, comprising a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue; increasing the magnetic field in said coil to induct an electrical field having a first direction in the tissue for a first period of time; decreasing the magnetic field to induct an electrical field having a second direction opposite said first direction in the tissue for a second period time, the second period of time being different than said first period of time; repeating the increasing and the decreasing steps in alternating order; defining a duty cycle as said first time period divided by a sum of said first and second time period; and maintaining said duty cycle to at least sixty-three percent.
-
-
23. A method for magnetically inducting an electrical field in tissue to create therapeutic charge transfer in the tissue, which comprises:
-
providing an apparatus for creating therapeutic charge transfer in tissue, comprising a coil generating a changing magnetic field to induct an electric field in the tissue exceeding 10 mV/cm when said coil is 5 cm from the tissue; increasing the magnetic field in said coil to induct an electrical field having a first direction in the tissue for a first period of time; and decreasing the magnetic field to induct an electrical field having a second direction opposite said first direction in the tissue for a second period time, the second period of time being different than said first period of time; creating said magnetic field in a coil; connecting said coil to an increase subcircuit that feeds current to said coil during the increasing step; and connecting said coil to a decrease subcircuit that robs current from said coil during the decreasing step. - View Dependent Claims (24, 25, 26)
-
Specification