Patent ID: 8992587
Filing Date: 2015-03-31
Classification: A61B

Abstract:
1. A surgical implant comprising: a screw element defining a bone screw for compressing a first bone and a second bone together, said screw element having a screw head, a first thread having a first thread pitch, a second thread having a second thread pitch and an intermediate portion coupling said first and second threads, said second thread pitch being greater than said first thread pitch and said second thread being longer and having a longer lead than said first thread; said screw head defining a tool attachment zone adjacent a buttressing head, said tool attachment zone being threaded; and said buttressing head between said tool attachment zone and said first thread and being dimensioned to be larger than a diameter of said first thread to provide external buttressing as said first thread and said second thread drive and compress said first bone and said second bone, respectively, together; wherein said buttressing head is not threaded and said first thread drives said first bone at a rate that is smaller than a rate at which said second thread drives said second bone; wherein said first thread is proximally located adjacent said buttressing head and said second thread is distal and spaced from said first thread; wherein said screw element comprises a plurality of locking slots to facilitate allowing for bone growth over said screw element and helping to prevent said screw element from loosening; wherein said first thread being a proximal thread and having a first set of locking slots and said second thread being a distal thread and having a second set of locking slots.