System for detecting position of capsule endoscope in subject

• US 7,523,756 B2
• Filed: 12/21/2004
• Issued: 04/28/2009
• Est. Priority Date: 12/25/2003
• Status: Expired due to Fees

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Corporation
• Inventors: Minai, Tetsuo, Shimizu, Hatsuo
• Primary Examiner(s): Marmor, II; Charles A.
• Assistant Examiner(s): MATTHEWS, CHRISTINE HOPKINS
• Application Number:
  US11/018,693
• Publication Number:
  US 20050139222A1
• Time in Patent Office: 1,589 Days
• Field of Search: 600 9- 15, 600/117, 600/409, 600/424, 128/899
• US Class Current: 128/899
• CPC Class Codes: A61B 1/041 Capsule endoscopes for imaging
• CPC Class Codes: A61B 1/042 characterised by a proximal camera, e.g. a CCD camera
• CPC Class Codes: A61B 2034/2051 Electromagnetic tracking systems
• CPC Class Codes: A61B 2034/2072 Reference field transducer attached to an instrument or patient
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61B 5/062 using magnetic field
• CPC Class Codes: A61B 5/42 Detecting, measuring or recording for evaluating the gastrointestinal, the endocrine or the exocrine systems A61B1/00, A61B5/4857, A61B5/486, A61B5/4866, A61B5/4869 take precedence
• CPC Class Codes: A61B 5/6831 Straps, bands or harnesses
• CPC Class Codes: A61B 6/12 Arrangements for detecting or locating foreign bodies
• CPC Class Codes: A61B 90/36 Image-producing devices or illumination devices not otherwise provided for
• CPC Class Codes: A61B 90/361 Image-producing devices, e.g. surgical cameras

Abstract

A system is for detecting a position of a device. The device is swallowed, passes through a subject, and includes a magnetic field generator generating a constant magnetic field. The system also includes a position transducer. The position transducer includes a magnetic detector detecting an intensity of a magnetic field component parallel to a constant magnetic field output from the magnetic field generator, and a position processor calculating a position of the device in the subject based on the intensity detected by the magnetic detector.

Claims

1. A system comprising:

a device that is adapted to be swallowed and passed through a subject, and includes a magnetic field generator generating a constant magnetic field; and

a position transducer that includes;

a magnetic detector detecting an intensity of a magnetic field component in a vertical direction, the magnetic field component being a component of the constant magnetic field generated by the magnetic field generator; and

a position processor calculating a position of the device in the subject based on the intensity detected by the magnetic detector;

wherein the device further includes;

a predetermined function executing unit that obtains information of an inside of the subject; and

a radio transmitting unit that transmits the information of the inside of the subject with radio communication, and

the position transducer further includes a receiving unit that receives a radio signal transmitted from the radio transmitting unit;

wherein the position transducer includes a plurality of receiving units each receiving a radio signal transmitted from the radio transmitting unit, and a selector that selects a receiving unit used for receiving a radio signal based on the position calculated by the position processor.

2. The system according to claim 1, wherein the magnetic detector has a magnetic field detecting direction maintaining unit that maintains a magnetic field detecting direction in the vertical direction.

3. The system according to claim 1, wherein the magnetic field generator has a magnetic field output direction maintaining unit that maintains an output direction of the constant magnetic field in the vertical direction irrespective of fluctuations in an orientation of the device, and

the magnetic detector has a magnetic field detecting direction maintaining unit that maintains the detecting direction of the magnetic field component in the vertical direction irrespective of fluctuations in a posture of the subject.

4. The system according to claim 1, wherein the position transducer includes a plurality of magnetic detectors, and

the position processor calculates a distance between the device and each of the magnetic detectors based on intensities of magnetic field components detected by the magnetic detectors, and calculates a position of the device in a subject based on the calculated distances.

5. A system comprising:

a device that is adapted to be swallowed and passed through a subject, and includes a magnetic field generator generating a constant magnetic field; and

a position transducer that includes;

a magnetic detector detecting an intensity of a magnetic field component in a vertical direction, the magnetic field component being a component of the constant magnetic field generated by the magnetic field generator; and

a position processor calculating a position of the device in the subject based on the intensity detected by the magnetic detector;

wherein the device further includes;

a predetermined function executing unit that obtains information of an inside of the subject; and

a radio transmitting unit that transmits the information of the inside of the subiect with radio communication, and

the position transducer further includes a receiving unit that receives a radio signal transmitted from the radio transmitting unit;

wherein the function executing unit includes;

an illuminating unit adapted to illuminate an inside of the subject; and

an image capturing unit that captures an image of a region illuminated by the illuminating unit;

wherein the position transducer further includes a storage unit that stores an image captured by the image capturing unit and the position of the device at when the image is captured, so that the image and the position are associated with each other.