Instrument and method for measuring three-dimensional motion

Details Instrument and method for measuring three-dimensional motion Instrument and method for measuring three-dimensional motion

2008-07-22

2008-07-22

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S207110, C324S207150, C324S207160, C324S244000

Reexamination Certificate

active

07402996

ABSTRACT:
An instrument (10) for measuring three-dimensional motion in a living body comprises a plurality of magnetism generators (12i) fixed to one of at least two objects (44, 46) moving relatively in the living body, a plurality of magnetic field sensors (14j) fixed to the other object in order to perform noncontact detection of the magnetic field of each magnetism generator (12i), and a signal processing means (26) for calculating relative position and direction between each magnetism generator (12i) and each magnetic field sensor (14j) according to a magnetic field detected by each magnetic field sensor (14j). The number of magnetism generators (12i) and magnetic field sensors (14j) is at least five, respectively.

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S. Yabukami, et al., “Error Analysis of a Jaw-Tracking System Using Two Magnets”, 2003, pp. 765-770, vol. 27, No. 6.

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