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Instrument and method for measuring three-dimensional motion

外国特許コード F110005583
整理番号 RJ006P78WO
掲載日 2011年9月8日
出願国 アメリカ合衆国
出願番号 54705005
公報番号 20070252586
公報番号 7402996
出願日 平成17年3月31日(2005.3.31)
公報発行日 平成19年11月1日(2007.11.1)
公報発行日 平成20年7月22日(2008.7.22)
国際出願番号 JP2005006275
国際公開番号 WO2005094677
国際出願日 平成17年3月31日(2005.3.31)
国際公開日 平成17年10月13日(2005.10.13)
優先権データ
  • 特願2004-106789 (2004.3.31) JP
  • 2005WO-JP06275 (2005.3.31) WO
発明の名称 (英語) Instrument and method for measuring three-dimensional motion
発明の概要(英語) (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.
特許請求の範囲(英語) [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.
  • 発明者/出願人(英語)
  • ARAI KENICHI
  • YABUKAMI SHIN
  • KANETAKA HIROYASU
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • A61B005/11W
  • A61B005/45R2B
  • A61B005/68
  • A61C019/045
  • K61B005/45K
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