REFERENCE MARKER AND USE IN A MOTION TRACKING SYSTEM
First Claim
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1. A reference marker for use in a motion tracking system comprising:
- a reference body being formed of a plurality of elongated bar members that are arranged according to a predetermined pattern, each bar being reflective to light, the plurality of bar members defining distinct reference faces that are arranged such that the reference marker has 360 degrees of visibility since at least one reference face is always in view and is visible to the motion tracking system.
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Abstract
The present invention is directed to reference markers that are used in position measuring device that can be part of a computer assisted surgery (CAOS) system. The reference marker is constructed of a rigid body that has 360 degrees of visibility.
41 Citations
34 Claims
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1. A reference marker for use in a motion tracking system comprising:
a reference body being formed of a plurality of elongated bar members that are arranged according to a predetermined pattern, each bar being reflective to light, the plurality of bar members defining distinct reference faces that are arranged such that the reference marker has 360 degrees of visibility since at least one reference face is always in view and is visible to the motion tracking system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A rigid body with 360 degrees of visibility comprising:
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four reflective spheres arranged in a pyramid formation such that four distinct reference planes are defined, each reference plane being defined by three spheres; and disc shaped dividers arranged to prevent spheres from behind from overlapping the spheres in the front when the spheres from behind are in line with the line of sight of a detector. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A motion tracking system comprising:
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a position measuring device for detecting the position and orientation of an object by tracking the relative movement of a reference marker attached to the object; a computer that is configured to determine and track positions of the reference marker; wherein the reference marker is constructed so that it includes four distinct reference faces that are arranged such that the reference marker has 360 degrees of visibility since at least one reference face is always in view and is visible to the position measuring device. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification