Osteosynthesis screw with reduced radial compression
AssigneeIn2Bones
InventorsBertrand Xavier François Gauneau, Eric Stéphane Fourcault, Jean-Christophe Alain Giet
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Abstract
The invention concerns an osteosynthesis screw (1) formed from a core (2) externally provided with a helical thread (3), said screw comprising a distal penetration portion and a proximal portion forming the head of the screw (6) and having a conical longitudinal section characterized in that the proximal portion comprises annular notches which are formed in the thickness of the core (2) and in the gaps between the threads of said proximal portion in such a way as to reduce the radial pressure during screwing.—Surgical device.
Claims19
An osteosynthesis screw (1) formed by a core (2) provided externally with a helical thread (3), said screw having a distal penetration portion (4) and a proximal portion (5) forming the screw head (6) and having a conical longitudinal section,
- wherein the proximal portion (5) forming the screw head (6) and having the conical longitudinal section includes circular notches (12) that are formed in the thickness of the core (2) and in the inter-thread gaps (13) of said proximal portion (5), said circular notches, as disposed and configured, reducing radial pressure during screw tightening, and
- wherein the circular notches (12) that are formed in the thickness of the core (2) and in the inter-thread gaps (13) of said proximal portion (5) extend generally in a circular direction relative to a circular section of the core (2).
An osteosynthesis screw (1), formed by a core (2) provided externally with a helical thread (3), said screw having a distal penetration portion (4) and a proximal portion (5) forming the screw head (6) and having a conical longitudinal section,
- wherein the proximal portion (5) forming the screw head (6) and having the conical longitudinal section includes circular notches (12) that are formed in the thickness of the core (2) and in the inter-thread gaps (13) of said proximal portion (5), said circular notches, as disposed and configured, reducing radial pressure during screw tightening, and
- wherein the circular notches (12) form depressions (15) of concave curvature, defining a leading edge (16) that is downstream relative to a screw-tightening direction V.
An osteosynthesis screw (1) formed by a core (2) provided externally with a helical thread (3), said screw having a distal penetration portion (4) and a proximal portion (5) forming the screw head (6) and having a conical longitudinal section,
- wherein the proximal portion (5) forming the screw head (6) and having the conical longitudinal section includes circular notches (12) that are formed in the thickness of the core (2) and in the inter-thread gaps (13) of said proximal portion (5), said circular notches, as disposed and configured, reducing radial pressure during screw tightening, and
- wherein the circular notches (12) form depressions (15) of concave curvature, defining a leading edge (16) that is downstream relative to a screw-tightening direction V, each of the depressions (15) being provided with a closed upstream edge (19) forming a partition that is orthogonal to the periphery of the core (2).
Dependencies are inferred from the claim text.