Bone plates, screws and instruments
View Patent ↗Systems for trauma and/or joint fusion implants and instruments include transarticular screw and intra-articular washer, polyaxial screw and plate, single- and multi-level polyaxial bone clamps, and minimally invasive adaptations.
1. A plate system for attachment to bone, comprising:
a first plate comprising a first obverse side and a first reverse side opposite the first obverse side;
a second plate comprising a second obverse side and a second reverse side opposite the second obverse side;
a sleeve comprising a through hole; and
a locking mechanism coupling the first plate to the second plate with the first obverse side facing the second obverse side, the sleeve between the first and second obverse sides, and a portion of the locking mechanism extending through the hole of the sleeve.
2. The system of claim 1 , wherein the locking mechanism forms a first polyaxial joint with the first plate and a second polyaxial joint with the second plate;
wherein the plate assembly has an unlocked configuration and a provisionally locked configuration;
wherein, in the unlocked configuration, the first and second plates independently polyaxially rotate relative to the locking mechanism and the first plate translates relative to a portion of the locking mechanism; and
wherein, in the provisionally locked configuration, the first and second plates are rotationally and translationally fixed relative to the locking mechanism.
3. The system of claim 1 , wherein a cross section of the sleeve, taken perpendicular to a longitudinal center axis of the sleeve through hole, comprises a polygonal outer profile.
4. The system of claim 3 , wherein the polygonal outer profile is asymmetrically disposed around the sleeve through hole.
5. The system of claim 1 , wherein a cross section of the sleeve, taken along a longitudinal center axis of the sleeve through hole, comprises a concave outer profile.
6. The system of claim 5 , wherein the sleeve comprises a flange at each end and a reduced diameter midsection between the ends.
7. A plate system for attachment to bone, comprising:
a first plate comprising a first obverse side and a first reverse side opposite the first obverse side;
a second plate comprising a second obverse side and a second reverse side opposite the second obverse side;
a cage comprising an opening therethrough, wherein the cage reversibly expands and contracts in an adjustment direction; and
a locking mechanism coupling the first plate to the second plate with the first obverse side facing the second obverse side, the cage between the first and second obverse sides, and a portion of the locking mechanism extending through the opening of the cage.
8. The system of claim 7 , wherein the cage rotates about a center longitudinal axis of the locking mechanism.
9. The system of claim 7 , wherein the adjustment direction is parallel to a center longitudinal axis of the locking mechanism.
10. The system of claim 7 , wherein the adjustment direction is perpendicular to a center longitudinal axis of the locking mechanism.
11. The system of claim 7 , wherein the locking mechanism forms a first polyaxial joint with the first plate and a second polyaxial joint with the second plate;
wherein the plate assembly has an unlocked configuration and a provisionally locked configuration;
wherein, in the unlocked configuration, the first and second plates independently polyaxially rotate relative to the locking mechanism and the first plate translates relative to a portion of the locking mechanism; and
wherein, in the provisionally locked configuration, the first and second plates are rotationally and translationally fixed relative to the locking mechanism.