Adjustable compression bone screw
OwnerRichard R. Glissoninventor
Life of this patent
Estimating the term…
Abstract
An adjustable compression bone screw that has a shaft having first and second sections each with an external screw thread that may be rotated as a unit or independently. The screw includes means adapted to receive a first driving tool for driving the shaft as unit and further adapted to receive a second driving tool for rotating the second section independently of the first section.
Claims9
A bone screw for connecting first and second bone fragments together, comprising:
- (a) a shaft having a first section and a second section rotatable independently of each other;
- (b) a first external screw thread on said first section;
- (c) a second external screw thread on said second section;
- (d) means associated with said second section adapted to receive a first driving tool for driving the screw as a unit and further adapted to receive a second driving tool for rotating the second section independently of the first section whereby upon rotation of the shaft by the first driving tool, the screw is advanced as a unit through the first and second bone fragments with the first and second sections being received in the respective first and second bone fragment and when the second section is rotated in a direction opposite to the direction of rotation for driving the screw as a unit into the first and second bone fragments, the second bone fragment is drawn towards and closely adjacent to the first bone fragment.
An apparatus for connecting first and second bone fragments together, comprising:
- (a) a screw comprising:
- i. a shaft having a first and a second section rotatable independently of each other;
- ii. a first external screw thread on said first section;
- iii. a second external screw thread on said second section;
- iv. means associated with said second section adapted to receive a first driving tool for driving the screw as a unit through the first and second bone fragments with the first and second sections being received in the respective first and second bone fragments and further adapted to receive a second driving tool for rotating said second section independently of said first section;
- (b) a first driving tool comprising:
- i. an elongate shaft having a first driving means located proximate one end thereof;
- said first driving means adapted to drive the screw as a unit;
- (c) a second driving tool comprising:
- i. an elongate shaft having a second driving means located proximate one end thereof;
- said second driving means adapted to engage only the trailing end of said screw.
A method of connecting a first and second bone fragment together in compressive engagement comprising the steps of:
- rotating in a first direction a bone screw having a first section and a second section with a first external screw thread on the first section and a second external screw thread on the second section, and where the second section is adapted to receive a first driving tool for rotating the first and second sections together to advance the bone screw as a unit so that the first section is positioned in the first bone fragment and the second section is positioned in the second bone fragment;
- and
- rotating in the opposite direction the second section independent of the first section with a second driving tool to move the second bone fragment into proximate compressive engagement with the first bone fragment.
Dependencies are inferred from the claim text.