Patent ID: 9668798
Date: 2017-06-06
CPC Classifications: A61B

Claim:
1. A sonic screw system comprising: a. a monolithic bone screw extending along a central longitudinal axis for implantation into a bone for fixation of a fracture, the monolithic bone screw includes a partially threaded distal shaft portion, a radially outwardly extending collar, an externally threaded proximal shaft portion, and a through bore extending along the central longitudinal axis of the monolithic bone screw through the distal shaft portion, the collar and the proximal shaft portion; b. a polymer pin made of a thermoplastic fluidizable material which is fluidizable by applying ultrasound energy, said through bore includes a step adjacent the distal tip, said step has a narrower diameter than a diameter of the through bore, such that the polymer pin is seated on the step when being inserted into the through bore of the shaft; c. a driving tool having a driving tip shaped to engage with the inner tool engagement socket at the proximal end of the screw; d. a hollow tissue protection sleeve extending longitudinally from a distal end to a proximal end, said distal end of the sleeve includes an inner threaded portion, the inner threaded portion being configured to engage the external thread of the proximal shaft portion, and said proximal end of the sleeve includes a gripping portion diametrically enlarged relative to the distal end of the sleeve, such that, when engaged they form a screw-sleeve assembly with greater length than an entire length of the bone screw, the tissue protection sleeve includes a longitudinal channel extending therethrough being configured to partially accommodate the driving tool, the hollow tissue protection sleeve distal end outer surface located adjacent the annular collar surface when assembled to the screw, the sleeve distal end outer surface tapering inwardly to a diameter not greater than the second maximum diameter, and configured to abut the tapering surface of the collar; e. an augmentation tool including a sonotrode for fluidizing the polymer pin material of the polymer pin, wherein the augmentation tool is configured to be mounted on the proximal end of the tissue protection sleeve, and the sonotrode configured to extend through the channel of the protection sleeve and in the through bore of the bone screw to and contacts a proximal end of the polymer pin when the pin is seated on the step in the through bore of the bone screw and configured to transmit an ultrasonic vibration to the polymer pin; and wherein the protection sleeve is configured to connect with the bone screw to facilitate the introduction of the driver and the sonotrode therethrough without interfering with surrounding tissue.