Surgical screw and tool for its insertion
OwnerRoy Sanders, Karen Gallen +2inventors
InventorsRoy Sanders, Karen Gallen, Jukka Rouhiainen, Kimmo Lahteenkorva
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Abstract
A surgical screw system using a surgical screw that is at least partially bioabsorbable in vivo, the screw having a recess (or optionally recesses) in its head for receiving an inserter instrument, wherein the recess has a rotational symmetry around the longitudinal axis of the screw. The recess comprises an odd number of rounded lobes extending away from the center of the head. The inserter for the screw comprises a distal end that matches the shape of the recess in the screw and can be slidably engaged with the recess.
Claims16
A surgical screw which is at least partially bioabsorbable in vivo comprising:
- an elongated shank, at least a portion of said shank comprising threads;
- and
- a head comprising a proximal surface that is substantially perpendicular to the longitudinal axis of the shank,
- said shank protruding distally from said head,
- said head comprising a recess in said proximal surface, said recess having a cross-section with a rotational symmetry around the longitudinal axis of the shank, said recess comprising an odd number of rounded lobes extending away from the center of the head.
A surgical screw which is at least partially bioabsorbable in vivo comprising:
- an elongated shank, at least a portion of said shank comprising threads;
- and
- a head comprising a proximal surface that is substantially perpendicular to the longitudinal axis of the shank,
- said shank protruding distally from said head,
- said head comprising a recess in said proximal surface,
- said recess having a cross-section with a rotational symmetry of 120 degrees around the longitudinal axis of the shank,
- said recess having three rounded lobes extending away from the center of the head, said lobes forming the cross-sectional shape of a cloverleaf.
A surgical screw which is at least partially bioabsorbable in vivo comprising:
- an elongated shank, at least a portion of said shank comprising threads;
- and
- a head comprising a proximal surface that is substantially perpendicular to the longitudinal axis of the shank,
- said shank protruding distally from said head,
- said head comprising a plurality of recesses in said proximal surface,
- said recesses being located in said head so as to have a rotational symmetry around the longitudinal axis of the shank,
- said recesses having curved shapes.
A surgical screw system comprising:
- a surgical screw which is at least partially bioabsorbable in vivo and an inserter for said screw,
- wherein said screw comprises:
- an elongated shank, at least a portion of said shank comprising threads;
- and
- a head comprising a proximal surface that is substantially perpendicular to the longitudinal axis of the shank,
- said shank protruding distally from said head,
- said head comprising a recess in said proximal surface,
- said recess having a cross-section with a rotational symmetry around the longitudinal axis of the shank,
- said recess having three rounded lobes extending away from the center of the head,
- said lobes forming the cross-sectional shape of a cloverleaf;
- and wherein said inserter for said screw comprises:
- an elongated body having a distal end,
- said distal end comprising three rounded lobes forming the shape of a cloverleaf in cross section,
- said lobes having a rotational symmetry around the longitudinal axis of said body, at least a portion of said distal end having a cross section substantially the same as the cross section of said recess in said screw head;
- wherein said distal end is capable of slidable engagement with said recess in said screw head.
Dependencies are inferred from the claim text.