Parallax Medical, Inc.

Mary E Jensen

Howard E Preissman

Jacques E Dion

Precision depth guided instruments are provided for use in performing percutaneous implantation of hard tissue implant materials. A depth guided stylet include a point adapted for piercing hard tissue, self-tapping threads for self-tapping into hard tissue, and, optionally, a second set of threads for meshing with threads within a overfitting cannula. The stylet may include an elongated rod having a first section having a first diameter, and a second section having a second diameter larger than the first diameter. A cannula for use with a depth guided stylet includes an elongated tube having first and second open ends adapted for a depth guided stylet to pass therethrough. The cannula may include threads along at least a portion of an interior circumference of the elongated tube, which are adapted to mate with threads on an exterior circumference of the depth guided stylet. Alternatively, a set of intersecting grooves may be included in the handle of the cannula to mate with a protrusion on the handle of the stylet. A method of using the instruments is also disclosed, as is a kit which includes the instruments and which is used to open a pathway into hard tissue.

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Croget, VA, United States of America

Mary E Jensen