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US RE28,841 EGranted
Osteosynthetic pressure plate construction
AssigneeSynthes GmbH
InventorsMartin Allgower, Stefan Perren, Max E. Russenberger
Life of this patent
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AssigneeSynthes GmbH
InventorsMartin Allgower, Stefan Perren, Max E. Russenberger
Estimating the term…
An osteosynthetic pressure plate includes a slot formation for receiving a bone-fixing screw which is adapted to be secured to a bone part which is to be mended. The slot is formed with an edge which includes an oblique portion or ramp having an inclination such that when it is engaged by the underside of a head portion of a bone-fixing screw there will be a displacement of the pressure plate in a direction to move the ramp portion away from the fixing screw and to cause the plate to apply a pressure to hold the bone parts in tight engagement. The plate is advantageously useable with screws having heads of spherical form or conical form, for example. The inclination of the ramp and the configuration of the walls bounding the slot of the pressure plate are such that there will be a uniform and even shifting of the plate having the slot when the ramp of the walls bounding the slot is engaged by the screw head to cause the desired displacement of the pressure plate in order to displace the bone fragment toward tighter engagement with the adjacent bone fragment and into pressure engagement therewith.
An apparatus for securing bone fragments together in pressure contact using screws at least one of which has a head with an inwardly tapered undersurface, comprising a plate having a top side and a bottom side and at least two spaced [longitudinally elongated] slot openings extending therethrough for receiving the screws which are adapted to pass through the slot openings to engage into respective bone fragments, at least one of said openings being longitudinally elongated, and said plate having a wall bounding at least one of said openings which is inclined at an angle to said top side toward said bottom side to cause shifting of the plate in a direction to move the bone fragments together when engaged by the tapered undersurface of the head of the screw as said plate is being secured to its respective bone fragment, said inclined wall of said slot extending from said top surface inwardly and downwardly towards said bottom surface and defining an inclined planar surface from one end of the slot to the other which is displaceable by the tapered undersurface of the screw head when it is advanced into its respective bone fragment.
In a bone compression plate for moving adjacent bone sections relative to each other;
A device for securing broken bone fragments together in pressure contact using screws, at least one screw having a head with an inwardly tapered undersurface, comprising a plate adapted to engage over the bone fragments and bridge the break, said plate having a top side and a bottom side and having at least two sets of longitudinally spaced slot openings, said sets being spaced apart longitudinally and defining a central area therebetween which is adapted to overlie the break, said slot openings extending through said plate for receiving the screws which are adapted to pass through the slot openings to engage into respective bone fragments, a slot of at least one of said sets which is nearest to said central area comprising a control slot which is longitudinally elongated, said plate having a wall bounding the longitudinally elongated control slot which is inclined at an angle from said top side toward said bottom side to cause shifting of the plate in the direction to move the bone fragments together when engaged by the tapered undersurface of the head of the screw as said plate is being secured to its respective bone fragment, said inclined wall of said slot extending from said top surface inwardly and downwardly toward said bottom surface and defining an inclined planar surface from one end of the slot to the other which is displaceable by the tapered undersurface of the screw head when it is advanced into its respective bone fragment.
Dependencies are inferred from the claim text.