Fiducial marker
AssigneeAugmedics Ltd.
InventorsStuart Wolf, Nissan Elimelech
Life of this patent
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Abstract
A medical marking device, consisting of a radiotransparent plate having a first plurality of radiopaque elements embedded therein in a first predefined pattern and a second plurality of optical reflectors positioned on a surface in proximity to the plate in a second predefined pattern. The device also includes a sigmoid mounting arm having a first end connected to the radiotransparent plate and a second end containing one or more fastening receptacles.
Claims14
A method, comprising:
- rigidly attaching a retaining structure to a bone of a patient;
- connecting a first end of a sigmoid mounting arm to the retaining structure, the sigmoid mounting arm having a second end fixedly connected to a plate that has a first plurality of optical reflectors positioned in a first predefined pattern on a surface thereof;
- optically scanning the first plurality of optical reflectors so as to form a first optical scan;
- disconnecting the first end of the sigmoid mounting arm from the retaining structure and connecting a patient marker, having a second plurality of optical reflectors in a second predefined pattern, to the retaining structure;
- optically scanning the second plurality of optical reflectors so as to form a second optical scan;
- and
- causing one or more computer processors to:
- derive from the first and the second optical scans a correction vector indicative of a difference between a location and an orientation of the plate and a location and an orientation of the patient marker;
- and
- in response to the correction vector, register a frame of reference of the patient with a frame of reference of the patient marker.
A computer-implemented method for performing an augmented reality procedure on a patient, wherein an operator of the procedure wears a head-mounted display and rigidly attaches a retaining structure to a bone of the patient, attaches a fiducial marker to the retaining structure, then detaches the fiducial marker from the retaining structure and attaches a patient marker to the retaining structure, the method comprising;
- accessing a computerized tomography scan of the attached fiducial marker;
- storing an image of the computerized tomography scan in a memory;
- analyzing the stored image so as to determine a registration of a frame of reference of the fiducial marker with a frame of reference of an anatomy of the patient;
- acquiring an image of the patient marker while the patient marker is attached to the retaining structure that is rigidly attached to the bone of the patient;
- and
- using the registration and the acquired image to align images projected on the head-mounted display with the anatomy of the patient as seen from a point of view of the operator of the procedure.
Dependencies are inferred from the claim text.