Title:
POSITION INFORMATION DETECTING DEVICE AND POSITION INFORMATION DETECTING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2005/115219
Kind Code:
A1
Abstract:
A technique of deriving the position information between an object coordinate axis fixed to an object to be detected and a reference coordinate axis set irrespective of the movement of the object. First and second linear magnetic fields moving in a known direction on the reference coordinate axis are produced, and the directions of the movement of the first and second linear magnetic fields on the object coordinate axis are detected by means of a magnetic sensor incorporated in a capsule endoscope (2) which is the object to be detected. By comparing the directions of movement of the first and second linear magnetic fields on the object coordinate axis detected by the magnetic sensors with the known direction on the reference axis, the difference of the direction of the object coordinate axis from that of the reference coordinate axis is detected. Separately from the first and second magnetic fields, a diffusion magnetic field the intensity of which decreases with the distance of movement is produced, and the intensity of the diffusion magnetic field is detected by means of the magnetic sensor incorporated in the capsule endoscope (2). The position relation of the origin of the object coordinate axis with the origin of the reference coordinate axis is derived.
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Inventors:
MINAI TETSUO (JP)
MATSUI AKIRA (JP)
MATSUI AKIRA (JP)
Application Number:
PCT/JP2005/009381
Publication Date:
December 08, 2005
Filing Date:
May 23, 2005
Export Citation:
Assignee:
OLYMPUS CORP (JP)
MINAI TETSUO (JP)
MATSUI AKIRA (JP)
MINAI TETSUO (JP)
MATSUI AKIRA (JP)
International Classes:
A61B5/07; A61B1/00; (IPC1-7): A61B1/00
Foreign References:
| JPH04112305A | 1992-04-14 | |||
| JP2004041709A | 2004-02-12 | |||
| JPH0947989A | 1997-02-18 | |||
| JPS5635009A | 1981-04-07 | |||
| JPH0972192A | 1997-03-18 |
Other References:
See also references of EP 1749473A4
Attorney, Agent or Firm:
Sakai, Hiroaki (Kasumigaseki Building 2-5, Kasumigaseki 3-chom, Chiyoda-ku Tokyo19, JP)
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