Orthopedic plate for use in small bone repair
DCFirst Claim
1. A surgical plate system capable of being used to stabilize a small bone fracture comprisinga Y-shaped plate that has an inferior surface and which has a concentric superior surface forming a portion of a cylinder, the plate consisting of a trunk and a pair of a first arm and a second arm,the trunk having a linear medial longitudinal axis along the superior surface extending between a first and a second end, and the inferior surface of the plate defining a curve transverse to the medial axis,the first arm and the second arm extending from the first end of the trunk, the inferior surface of the first arm and of the second arm following the same curve as the inferior surface of the trunk,the first arm having an ear with at least one screw hole defining a first screw axis perpendicular to a tangent to the top surface of the first ear, the first ear being attached to the trunk by a linking section having a waist, a first angle and a first length being defined by a line from the center of the first arm screw hole to the intersection of the medial longitudinal axis of the trunk, and,the second arm having a second ear with at least one second screw hole defining a second screw axis perpendicular to a tangent to the top surface of the second ear, the second ear being attached to the trunk by a linking section having a waist, a second angle and a second length being defined by a line from the center of the second arm screw hole to the intersection of the medial longitudinal axis of the trunk, andthe first angle and the first length being different from the second angle and the second length whereby the first screw axis and the second screw axis converge toward the inferior side of the plate but do not intersect.
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Abstract
The present invention relates to an orthopedic plate and screw system and instruments for surgical fixation of a small bone or bones. The plate facilitates three dimensional contouring to provide for a variety of applications and to accommodate individual variation in bone shape. The plate has a modified x shape including a central trunk portion including one or more screw holes along a longitudinal axis and a set of divergent upper and an oppositely extending set of divergent lower arms, each arm including screw holes which are placed at a radially equal distance but which diverging asymmetrically from the longitudinal axis relative to its paired upper or lower mate. The screws of the system are self-starting, self-tapping screws including the option of partial or full cannulation.
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Citations
19 Claims
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1. A surgical plate system capable of being used to stabilize a small bone fracture comprising
a Y-shaped plate that has an inferior surface and which has a concentric superior surface forming a portion of a cylinder, the plate consisting of a trunk and a pair of a first arm and a second arm, the trunk having a linear medial longitudinal axis along the superior surface extending between a first and a second end, and the inferior surface of the plate defining a curve transverse to the medial axis, the first arm and the second arm extending from the first end of the trunk, the inferior surface of the first arm and of the second arm following the same curve as the inferior surface of the trunk, the first arm having an ear with at least one screw hole defining a first screw axis perpendicular to a tangent to the top surface of the first ear, the first ear being attached to the trunk by a linking section having a waist, a first angle and a first length being defined by a line from the center of the first arm screw hole to the intersection of the medial longitudinal axis of the trunk, and, the second arm having a second ear with at least one second screw hole defining a second screw axis perpendicular to a tangent to the top surface of the second ear, the second ear being attached to the trunk by a linking section having a waist, a second angle and a second length being defined by a line from the center of the second arm screw hole to the intersection of the medial longitudinal axis of the trunk, and the first angle and the first length being different from the second angle and the second length whereby the first screw axis and the second screw axis converge toward the inferior side of the plate but do not intersect.
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11. An implant system capable of being used to stabilize a small bone fracture comprising
a pre-contoured plate which is a Y-shaped plate, the plate consisting of a trunk defining a medial longitudinal axis with a first end and an opposing second end, and a first arm and a second arm extending from the first end of the trunk, the trunk having a continuous radial curve in the z direction about the longitudinal axis and the first arm and the second arm following the radial curve of the trunk so as to spiral about the longitudinal axis toward each other, the first arm having an ear with at least one screw hole defining a first screw axis, the first ear being attached to the trunk by a linking section having a waist, a first angle and a first length being defined by a line from the center of the first arm screw hole to the intersection of the longitudinal axis of the trunk, and the linking section waist being configured to bend relative to the trunk section without deforming the screw hole, the second arm having a second ear with at least one second screw hole defining a second screw axis, the second ear being attached to the trunk by a linking section having a waist, a second angle and a second length being defined by a line from the center of the second arm screw hole to the intersection of the longitudinal axis of the trunk, the linking section waist being configured to bend relative to the trunk section without deforming the through hole, and the first angle being different from the second angle by from about 2° - to about 20° and
the first length being different from the second length whereby the first screw axis and the second screw axis converge toward the inferior side of the plate but do not intersect. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
- to about 20° and
Specification