WIRELESS POWER SUPPLY APPARATUS, POWER TRANSMISSION COIL UNIT, AND WIRELESS POWER SUPPLY SYSTEM

• US 20110210621A1
• Filed: 05/12/2011
• Published: 09/01/2011
• Est. Priority Date: 11/17/2008
• Status: Active Grant

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Corporation
• Inventors: SAKAI, Youhei, DOI, Naohito, SATO, Ken, IWAISAKO, Hiroshi
• Granted Patent: US 9,282,880 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: A61B 1/00029 externally powered, e.g. wireless
• CPC Class Codes: A61B 1/041 Capsule endoscopes for imaging
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas

Abstract

A wireless power supply apparatus for a capsule-type endoscope has three sets of coils that generate a magnetic field in directions that are orthogonal to each other, a gravity sensor that detects a gravitational direction, a coil selection section that selects a coil that generates a magnetic field in a gravitational direction that is detected by the gravity sensor, and a drive section that applies a current to the coil that the coil selection section selects.

Claims

1. A wireless power supply apparatus that wirelessly supplies power to a capsule-type medical device that is introduced into a body of a subject, wherein:

the capsule-type medical device has a power receiving coil that receives an electric power by means of a change in a magnetic field;

the wireless power supply apparatus comprising;

a power transmission coil unit that is arranged on the subject, and that has three sets of power transmission coils that generate the magnetic field in directions that are orthogonal to each other,

a drive section that applies an electric current to at least one set of the power transmission coils, and

a coil selection section that selects the power transmission coils to apply the electric current to in order to cause the power receiving coil of the capsule-type medical device to generate an induced voltage.

2. The wireless power supply apparatus according to claim 1, wherein when two sets or more of the power transmission coils are selected, the coil selection section serially connects the two sets or more of the power transmission coils that are selected.

3. The wireless power supply apparatus according to claim 2, wherein the power transmission coils are arranged in clothing that the subject wears.

4. The wireless power supply apparatus according to claim 3, wherein:

the capsule-type endoscope has a structure that enables the capsule-type endoscope to float with a longitudinal direction thereof being perpendicular to a surface of a liquid that is retained inside a stomach of the individual to be examined;

the power transmission coil unit has a gravity sensor that detects a gravitational direction; and

the coil selection section selects the power transmission coils by taking a gravitational direction that the gravity sensor detects to be the longitudinal direction of the capsule-type medical device.

5. The wireless power supply apparatus according to claim 4, wherein the gravity sensor is a triaxial acceleration sensor.

6. The wireless power supply apparatus according to claim 5, wherein the capsule-type medical device is a capsule-type endoscope that has an image pickup section that is arranged at an end portion in the longitudinal direction.

7. A power transmission coil unit of a wireless power supply apparatus that wirelessly supplies power to a capsule-type medical device that is introduced into a body of a subject, wherein:

the capsule-type medical device has a power receiving coil that receives an electric power by means of a change in a magnetic field, and has a structure that enables the capsule-type medical device to float with a longitudinal direction thereof being perpendicular to a surface of a liquid that is retained inside a stomach of the individual to be examined;

the power transmission coil unit comprises three sets of power transmission coils that generate the magnetic field in directions that are orthogonal to each other, and a gravity sensor that detects a gravitational direction; and

the power transmission coil unit is arranged in clothing that the subject wears.

8. The power transmission coil unit according to claim 7, wherein the gravity sensor is a triaxial acceleration sensor.

9. The power transmission coil unit according to claim 8, wherein two sets or more of the power transmission coils are connected in series by coil a selection section of the wireless power supply apparatus.

10. The power transmission coil unit according to claim 9, wherein the capsule-type medical device is a capsule-type endoscope that has an image pickup section that is arranged at an end portion in a longitudinal direction.

11. A wireless power supply system comprising a capsule-type medical device that is introduced into a body of a subject, and a wireless power supply apparatus that wirelessly supplies power to the capsule-type medical device, wherein:

the capsule-type medical device is a capsule-type endoscope that has;

a power receiving coil that receives an electric power by means of a change in a magnetic field in a parallel direction to a longitudinal direction thereof, and an image pickup section that is arranged at an end portion in the longitudinal direction; and

the wireless power supply apparatus comprises;

a power transmission coil unit that is arranged on the subject, and that has three sets of power transmission coils that generate the magnetic field in directions that are orthogonal to each other,

a drive section that applies an electric current to at least one set of the power transmission coils, and

a coil selection section that selects the power transmission coils to apply the electric current to in order to generate a magnetic field in a longitudinal direction of the capsule-type medical device.

12. The wireless power supply system according to claim 11, wherein:

when two sets or more of the power transmission coils are selected, the coil selection section serially connects the two sets or more of the power transmission coils that are selected.

13. The wireless power supply system according to claim 12, wherein the power transmission coil unit is arranged in clothing that the subject wears.

14. The wireless power supply system according to claim 13, wherein:

the capsule-type medical device has a structure that enables the capsule-type medical device to float with a longitudinal direction thereof being perpendicular to a surface of a liquid that is retained inside the body of the subject;

the power transmission coil unit has a gravity sensor that detects a gravitational direction; and

the coil selection section selects the power transmission coils by taking a gravitational direction that the gravity sensor detects to be the longitudinal direction of the capsule-type medical device.

15. The wireless power supply system according to claim 14, wherein the capsule-type medical device is a capsule-type endoscope that has an image pickup section that is arranged at an end portion in the longitudinal direction.