Magnetic field generating-apparatus for biostimulation

Patent metadata

Field	Value
Publication number	US-11452882-B2
Application number	US-201916589450-A
Country	US
Kind code	B2
Filing date	Oct 1, 2019
Priority date	Oct 9, 2018
Publication date	Sep 27, 2022
Grant date	Sep 27, 2022

Abstract

A magnetic field generating-apparatus for biostimulation including: a core formed by magnetic material; and coils wound around portions of the cores, wherein the core includes at least two pairs of leg portions which are juxtaposed each other, in which for the respective two pairs of leg portions, there are provided gap-portions which mutually cross each other, the coils include first coil portions and second coil portions forming a first magnetic-path and a second magnetic-path between the two pairs of leg portions and the gap-portions respectively; and wherein there is generated a magnetic field of first direction which lies on the first magnetic-path, there is generated a magnetic field of second direction which lies on the second magnetic-path, and depending on a magnetic field formed by synthesizing the magnetic field of first direction and the magnetic field of second direction, a living body is stimulated.

First claim

What is claimed is:

1. A magnetic field generating apparatus for biostimulation comprising:
a core formed by magnetic material; and
coils wound around portions of the core,
wherein the core includes at least two pairs of leg portions which are juxtaposed each other, in which
for each one of the at least two pairs of leg portions, there are provided gap-portions which mutually cross each other,
the coils include first coil portions and second coil portions forming a first magnetic path and a second magnetic path between the at least two pairs of leg portions and the gap-portions respectively; and
wherein by the first coil portions and one pair of the at least two pairs of leg portions, there is generated a magnetic field of first direction which lies on the first magnetic path, by the second coil portions and an other pair of the at least two pairs of leg portions, there is generated a magnetic field of second direction which lies on the second magnetic path, and by a magnetic field formed by synthesizing the magnetic field of first direction and the magnetic field of second direction, a living body is configured to be stimulated, and
wherein a voltage applied to the first coil portions and a voltage applied to the second coil portions are different in phase, and the absolute value of the difference in phase is less than 180 degrees.

2. The magnetic field generating apparatus for biostimulation according to claim 1 , further comprising:
a power supply circuit which supplies alternating current to the coils; and
a control unit which controls the supply of the alternating current, wherein
the control unit can control the ratio between the magnitude of the alternating current which is supplied from the power supply circuit to the first coil portions and the magnitude of the electric current which is supplied from the power supply circuit to the second coil portions.

3. The magnetic field generating apparatus for biostimulation according to claim 2 , further comprising:
a sensor configured to detect an electric potential inside the living body, wherein
based on the electric potential detected by the sensor, the control unit controls the ratio between the electric current supplied to the first coil portions and the electric current supplied to the second coil portions according to feed-back control.

4. The magnetic field generating apparatus for biostimulation according to claim 1 , comprising:
2-circuit power supply circuits which supply alternating currents to the coils; and
a control unit which controls the supplies of the alternating currents, wherein
an output of one of the power supply circuits is connected to one of the first coil portions and the second coil portions, and an output of an other of the power supply circuits is connected to the other of the first coil portions and the second coil portions.

5. The magnetic field generating apparatus for biostimulation according to claim 1 , further comprising:
a power supply circuit which supplies alternating current to the coils;
a control unit which controls the supply of the alternating current; and
a switch which switches an output of the power supply circuit, wherein
the control unit controls the magnetic field of the first direction and the magnetic field of the second direction to be generated alternately by switching the alternating current between the first coil portions and the second coil portions within one pulse or a few pulses.

6. The magnetic field generating apparatus for biostimulation according to claim 1 , wherein
the core includes a first connecting portions which connects the leg portions of the one pair of the at least two pairs of leg portions, and a second connecting portion which connects the leg portions of the other pair of the at least two pairs of leg portions,
the first and the second connecting portions for the at least two pairs of leg portions are arranged at crossed positions, and
end surfaces of the at least two pairs of leg portions lie on the same plane.

7. The magnetic field generating apparatus for biostimulation according to claim 1 , wherein
the core includes a common base unit which connects the at least two pairs of leg portions mutually, and
the at least two pairs of leg portions are extending from the common base unit.

8. The magnetic field generating apparatus for biostimulation according to claim 1 , wherein
two neighboring leg portions within the at least two pairs of leg portions include facing surfaces which are extending mutually in parallel and are facing to each other.

9. The magnetic field generating apparatus for biostimulation according to claim 1 , wherein
the at least two pairs of leg portions are formed to have rectangular shapes in cross sections; and
each of the first coil portions and the second coil portions is formed by a winding-wire wound in a rectangular shape, in which for an inner edge thereof, there is formed a hole having a rectangular shape in cross section, and in which the first and the second coil portions are attached to the at least two pairs of leg portions such that respective leg portions of the at least two pairs of leg portions are passed through the holes.

10. A magnetic field generating apparatus for biostimulation comprising:
a core formed by magnetic material; and
coils wound around portions of the core,
wherein the core includes at least two pairs of leg portions which are juxtaposed each other, in which
for each one of the at least two pairs of leg portions, there are provided gap-portions which mutually cross each other,
the coils include first coil portions and second coil portions forming a first magnetic path and a second magnetic path between the at least two pairs of leg portions and the gap-portions respectively; and
wherein by the first coil portions and one pair of the at least two pairs of leg portions, there is generated a magnetic field of first direction which lies on the first magnetic path, by the second coil portions and an other pair of the at least two pairs of leg portions, there is generated a magnetic field of second direction which lies on the second magnetic path, and by a magnetic field formed by synthesizing the magnetic field of first direction and the magnetic field of second direction, a living body is configured to be stimulated, and
wherein the core includes a first connecting portion which connects the leg portions of the one pair of the at least two pairs of leg portions, and a second connecting portion which connects the leg portions of the other pair of the at least two pairs of leg portions,
the first and the second connecting portions for the at least two pairs of leg portions are arranged at crossed positions, and
end surfaces of the at least two pairs of leg portions lie on the same plane.

11. The magnetic field generating apparatus for biostimulation according to claim 10 , further comprising:
a power supply circuit which supplies alternating current to the coils; and
a control unit which controls the supply of the alternating current, wherein
the control unit can control the ratio between the magnitude of the alternating current which is supplied from the power supply circuit to the first coil portions and the magnitude of the electric current which is supplied from the power supply circuit to the second coil portions.

12. The magnetic field generating apparatus for biostimulation according to claim 11 , further comprising:
a sensor configured to detect an electric potential inside the living body, wherein
based on the electric potential detected by the sensor, the control unit controls the ratio between the electric current supplied to the firs

Assignees

• Sumida Corp

Inventors

• Kawarai Mitsugu

Classifications

• H01F7/064

  Circuit arrangements for actuating electromagnets (circuit arrangements for obtaining special operating characteristics H01F7/18; driving circuits for electromagnets making use of a switching regulator H01H47/325) · CPC title

• H01F7/20

  without armatures (cores H01F3/00; coils H01F5/00 {; shaping metal by applying magnetic forces B21D26/14; electromagnets specially adapted for NMR applications G01R33/381}) · CPC title

• H01F7/204

  Circuits for energising or de-energising · CPC title

• A61N2/02 Primary

  using magnetic fields produced by coils, including single turn loops or electromagnets (A61N2/12 takes precedence) · CPC title