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Instrument and method for measuring three-dimensional motion

Foreign code F110005583
File No. RJ006P78WO
Posted date Sep 8, 2011
Country United States of America
Application number 54705005
Gazette No. 20070252586
Gazette No. 7402996
Date of filing Mar 31, 2005
Gazette Date Nov 1, 2007
Gazette Date Jul 22, 2008
International application number JP2005006275
International publication number WO2005094677
Date of international filing Mar 31, 2005
Date of international publication Oct 13, 2005
Priority data
  • P2004-106789 (Mar 31, 2004) JP
  • 2005WO-JP06275 (Mar 31, 2005) WO
Title Instrument and method for measuring three-dimensional motion
Abstract (US7402996)
An instrument ( 10 ) for measuring three-dimensional motion in a living body comprises a plurality of magnetism generators ( 12 i) fixed to one of at least two objects ( 44, 46 ) moving relatively in the living body, a plurality of magnetic field sensors ( 14 j) fixed to the other object in order to perform noncontact detection of the magnetic field of each magnetism generator ( 12 i), and a signal processing means ( 26 ) for calculating relative position and direction between each magnetism generator ( 12 i) and each magnetic field sensor ( 14 j) according to a magnetic field detected by each magnetic field sensor ( 14 j).
The number of magnetism generators ( 12 i) and magnetic field sensors ( 14 j) is at least five, respectively.
Scope of claims [claim1]
1. An apparatus for measuring three-dimensional movement, comprising: a plurality of magnetic generators mounted on one of at least two relatively movable objects;
a plurality of magnetic field sensors mounted on another object, for detecting magnetic fields of said magnetic generators out of contact therewith;signal processing means for calculating relative positions and directions between said magnetic generators and said magnetic field sensors from the magnetic fields detected by said magnetic field sensors;
and
a plurality of non-contact calibrating coils;wherein said magnetic generators and said magnetic field sensors are paired in at least five combinations;each of said calibrating coils is paired in a total of at least five combinations;
and
calibrating magnetic fields generated by said calibrating coils are detected by said magnetic generators and said magnetic field sensors to measure initial positions and initial directions of said magnetic generators and said magnetic field sensors.
[claim2]
2. An apparatus for measuring three-dimensional movement according to claim 1, wherein each of said magnetic generators and said magnetic field sensors is of a planar type, each of said magnetic generators generates a uniaxial magnetic field, and each of said magnetic field sensors detects the uniaxial magnetic field.
[claim3]
3. An apparatus for measuring three-dimensional movement according to claim 2, wherein each of said magnetic generators and said magnetic field sensors comprises a planar coil for generating and detecting said uniaxial magnetic field.
[claim4]
4. An apparatus for measuring three-dimensional movement according to claim 3, wherein a measuring magnetic field generated by each of said magnetic generators comprises an alternating magnetic field.
[claim5]
5. An apparatus for measuring three-dimensional movement according to claim 4, wherein each of said magnetic generators comprises said planar coil and a capacitor connected in parallel to or in series to said planar coil, and said measuring magnetic field generated by each of said magnetic generators comprises an alternating magnetic field having the resonant frequency of said planar coil and said capacitor.
[claim6]
6. An apparatus for measuring three-dimensional movement according to claim 1, wherein each of said calibrating coils comprises a uniaxial, biaxial, or triaxial coil.
[claim7]
7. An apparatus for measuring three-dimensional movement according to claim 1, further comprising: electromagnetic coupling switching means for switching electromagnetic coupling combinations between said magnetic generators and said magnetic field sensors and switching electromagnetic coupling combinations between said calibrating coils and said magnetic generators or said magnetic field sensors;
and
coaxial cables electrically connecting said magnetic generators, said magnetic field sensors, and said calibrating coils to said electromagnetic coupling switching means.
[claim8]
8. A method of measuring three-dimensional relative movement of at least two objects, comprising the steps of: mounting a plurality of magnetic generators on one of said two objects, mounting a plurality of magnetic field sensors on another object, with said magnetic generators and said magnetic field sensors being paired in at least five combinations;
placing a plurality of calibrating coils near said magnetic generators and said magnetic field sensors out of contact therewith, and detecting calibrating magnetic fields generated by said calibrating coils with said magnetic generators and said magnetic field sensors to measure initial positions and initial directions of said magnetic generators and said magnetic field sensors when said two objects are not moving relatively to each other;removing said calibrating coils, and thereafter detecting a measuring magnetic field generated by one of said magnetic generators with one of said magnetic field sensors while electromagnetic coupling combinations between said magnetic generators and said magnetic field sensors are being switched by electromagnetic coupling switching means;
and
determining relative positions and directions of said magnetic generators with respect to said magnetic field sensors from magnetic fields detected by said magnetic field sensors, and calculating relative movement between said two objects.
[claim9]
9. An apparatus for measuring three-dimensional movement according to claim 1, wherein said two objects comprise two parts which move relatively to each other in a living body.
[claim10]
10. An apparatus for measuring three-dimensional movement according to claim 9 wherein said two objects on which said magnetic generators and said magnetic field sensors are mounted, comprise a combination of at least two of a part movable in unison with an upper jaw, a part movable in unison with a lower jaw, a tongue, and an artificial tooth mounted in an oral cavity.
[claim11]
11. An apparatus for measuring three-dimensional movement according to claim 9, wherein said magnetic generators and said magnetic field sensors are mounted in an oral cavity of an examinee.
[claim12]
12. A method of measuring three-dimensional relative movement according to claim 8, wherein said two objects comprise two parts which move relatively to each other in a living body.
[claim13]
13. A method of measuring three-dimensional relative movement according to claim 12, wherein said two objects comprise a combination of at least two of a part movable in unison with an upper jaw, a part movable in unison with a lower jaw, a tongue, and an artificial tooth mounted in an oral cavity.
[claim14]
14. A method of measuring three-dimensional relative movement according to claim 12, wherein said magnetic generators and said magnetic field sensors are monted in an oral cavity of an examinee.
  • Inventor, and Inventor/Applicant
  • ARAI KENICHI
  • YABUKAMI SHIN
  • KANETAKA HIROYASU
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
U.S. Cl./(Sub)
  • A61B005/11W
  • A61B005/45R2B
  • A61B005/68
  • A61C019/045
  • K61B005/45K
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