Connection of a bone screw to a bone plate
First Claim
1. A connection comprising a bone screw for screwing into a bone and a bone plate, the bone screw including a head which lies with a ring-shaped outer surface in contact on a counter-surface of the bone plate and is fixed with a securing screw which is screwed into the bone plate in the direction towards the counter-surface, the bone plate having a passage opening for a shaft of the bone screw, a height of the bone plate in a region of the bone screw being less than or equal to a diameter of the shaft, the screw head dipping into a cut-out of the securing screw, the securing screw terminating at an upper side of the bone plate, the head of the bone screw including a spherical pan with an outer surface and an inner surface having a common center, and the securing screw dipping into the pan with a suitable core.
3 Assignments
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Accused Products
Abstract
With the invention the connection of a bone screw (12) to a bone plate (7) is shown. The head (13) of the bone screw (12) lies with a ring-shaped outer surface (10) in contact on a counter-surface (25) and can be fixed with a securing screw (15) which can be screwed in in the direction towards the counter-surface (25). In this the height (16) of the bone plate (7) is chosen such that it is less than or equal to the shaft diameter (19) of the bone screw (12), whereas the screw head (13) dips into a cut-out (20) of the securing screw (15) and the upper side of the securing screw (15) terminates with the upper side of the bone plate (7).
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Citations
11 Claims
- 1. A connection comprising a bone screw for screwing into a bone and a bone plate, the bone screw including a head which lies with a ring-shaped outer surface in contact on a counter-surface of the bone plate and is fixed with a securing screw which is screwed into the bone plate in the direction towards the counter-surface, the bone plate having a passage opening for a shaft of the bone screw, a height of the bone plate in a region of the bone screw being less than or equal to a diameter of the shaft, the screw head dipping into a cut-out of the securing screw, the securing screw terminating at an upper side of the bone plate, the head of the bone screw including a spherical pan with an outer surface and an inner surface having a common center, and the securing screw dipping into the pan with a suitable core.
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10. A connection comprising a bone screw for screwing into a bone and a bone plate, the bone plate including a passage opening surrounded by a counter outer surface, the bone screw extending through the passage opening and having a head supported by the counter-surface of the bone plate, and a securing screw placed over the bone screw and threaded into the bone plate, the securing screw including a cut-out formed to receive at least a portion of the bone screw head so that, upon tightening the securing screw, the head of the bone screw is pressed against the ring-shaped outer surface of the bone plate, the head of the bone screw having a concave, spherically shaped inner surface facing towards the securing screw and a spherically shaped outer surface which is concentric with the inner surface and in engagement with the counter-surface, the securing screw including a spherically shaped, convex core which contacts the concave inner surface of the bone screw when the securing screw is tightened into the bone plate.
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11. A connection comprising a bone screw for screwing into a bone and a bone plate, the bone plate including an opening surrounded by a counter outer surface, the bone screw extending through the opening and having a head supported by the counter-surface of the bone plate, and a securing screw placed over the bone screw and threaded into the bone plate, the securing screw including a core engaging a portion of the bone screw head so that, upon tightening the securing screw, the head of the bone screw is pressed against the ring-shaped outer surface of the bone plate, the core, the head of the bone screw and the counter-surface defining cooperating and concentric concave and convex surfaces which permit an angular adjustment of the bone screw relative to the bone plate and the securing screw.
Specification