Medical screw and method of installation
First Claim
Patent Images
1. A method of installing a medical screw comprising the steps of:
- providing a medical screw having a head for receiving a screw driving device and a shaft extending from said head along a longitudinal axis, wherein said shaft includes (a) a threaded portion including helical threads and (b) a distal guiding tip extending longitudinally and distally from the threaded portion and including a cylindrical portion;
drilling an implantation site into bone at a desired location, the implantation site having a cylindrical core;
tapping the cylindrical core with tracks that correspond to the helical threads; and
inserting said distal guiding tip into said implantation site at a depth sufficient that a surface of the cylindrical portion contacts at least three points on the cylindrical core with each of the at least three points being separated by a track.
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Abstract
A medical screw includes a shaft having a threaded portion and a distal guiding tip for introducing the screw into a pre-drilled implantation site. The threaded portion of the medical screw has a first series of helical threads having a first diameter and a second series of helical threads interleaved with the first series of helical thread and having a second diameter, where the first diameter is different than the second diameter. In addition, the medical screw may have a counter-rotation channel configured to receive bone growth.
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Citations
4 Claims
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1. A method of installing a medical screw comprising the steps of:
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providing a medical screw having a head for receiving a screw driving device and a shaft extending from said head along a longitudinal axis, wherein said shaft includes (a) a threaded portion including helical threads and (b) a distal guiding tip extending longitudinally and distally from the threaded portion and including a cylindrical portion;
drilling an implantation site into bone at a desired location, the implantation site having a cylindrical core;
tapping the cylindrical core with tracks that correspond to the helical threads; and
inserting said distal guiding tip into said implantation site at a depth sufficient that a surface of the cylindrical portion contacts at least three points on the cylindrical core with each of the at least three points being separated by a track. - View Dependent Claims (2, 3, 4)
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Specification