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US 2020/0046477 A1Published application
Kit and method for tracking a human jaw
AssigneeClaronav Inc.
InventorDoron Dekel
Life of this patent
Estimating the term…
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AssigneeClaronav Inc.
InventorDoron Dekel
Estimating the term…
A kit and method for tracking a human jaw are provided. The kit and method can involve a bone screw and an extension arm. The bone screw has a threaded portion, a head portion and a longitudinal axis. The threaded portion can have a thread diameter of less than or equal to about 2.5 mm and can be inserted into a bone of the human jaw within 45° of the occlusal plane. The head portion protrudes out of the bone of the human jaw when the threaded portion is inserted into the bone. The extension arm can be rigidly secured to the head portion of the bone screw to maintain a fixed spatial mapping between the head portion of the bone screw and an optically detectable marking provided on the extension arm. When secured to the head portion of the bone screw, the extension arm can be positioned such that the optically detectable marking is detectable by an optical tracking system positioned outside the mouth containing the jaw bone.
The kit as defined in claim 1 wherein the extension arm comprises an optically trackable attachment and a receiving portion, the optically trackable attachment,
The kit as defined in claim 1 wherein the extension arm further comprises an unweakened portion for withstanding and a weakened portion for breaking when a force acting on the extension arm generates a torque tending to rotate the bone screw about an axis of rotation substantially orthogonal to the longitudinal axis of the bone screw, and the torque exceeds a torque threshold that would break the bone screw, the force acting at a point spaced from the bone screw by a lengthwise distance along the extension arm, the lengthwise distance defining a moment arm, such that the weakened portion is between the bone screw and the point spaced from the bone screw.
The kit as defined in claim 1 wherein
The kit as defined in claim 1 wherein the head portion of the bone screw comprises at least one recess for engaging the fastener of the extension arm to impede relative movement between the head portion of the bone screw and the head-receiving portion of the extension arm.
The kit as defined in claim 1 wherein the thread diameter is less than about 2. 3 mm.
A method for tracking changes in a pose of a jaw bone displaceable in a reference coordinate system, the jaw bone defining an occlusal plane, the method comprising:
Dependencies are inferred from the claim text.