Orthopedic bone plate bending irons
First Claim
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1. A tool for bending a malleable orthopedic bone plate comprising:
- an elongate rigid member having a longitudinal axis, said member having first and second substantially opposed major surfaces along said longitudinal axis and first and second lateral ends, said member having a first aperture spanning front and back substantially crescent-shaped aperture openings said front and back openings having an upper curvilinear side and an opposing lower curvilinear side located on respective major surfaces adjacent the first lateral end for accepting an orthopedic bone plate having a crescent-shaped cross section, wherein the front and back crescent-shaped aperture openings are offset from one another by an oblique angle relative to a perpendicular of the longitudinal axis.
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Abstract
The present invention is a simple machine that permits the concentrated application of a bending moment to a stiff metallic bone plate. The present invention permits bends along three orthogonal torsional axes. The present invention can be scaled so that modest sized operators can bend the most stout bone plates. The bending moments are transmitted to the bone plates through the edges of curved apertures so that the built in transverse curvature of the plate is not crushed with resulting weakening of the plate. Finally, the apertures are rotated and angled to provide comfortable hand clearance and to permit efficient application of muscle force by the operator.
85 Citations
26 Claims
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1. A tool for bending a malleable orthopedic bone plate comprising:
an elongate rigid member having a longitudinal axis, said member having first and second substantially opposed major surfaces along said longitudinal axis and first and second lateral ends, said member having a first aperture spanning front and back substantially crescent-shaped aperture openings said front and back openings having an upper curvilinear side and an opposing lower curvilinear side located on respective major surfaces adjacent the first lateral end for accepting an orthopedic bone plate having a crescent-shaped cross section, wherein the front and back crescent-shaped aperture openings are offset from one another by an oblique angle relative to a perpendicular of the longitudinal axis. - View Dependent Claims (2, 3, 4)
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5. A tool for bending a malleable orthopedic bone plate comprising:
an elongate rigid member having a longitudinal axis, said member having first and second substantially opposed major surfaces along said longitudinal axis and first and second lateral ends, said member having a first aperture spanning front and back substantially crescent-shaped aperture openings said front and back openings having an upper curvilinear side and an opposing lower curvilinear side located on respective major surfaces adjacent the first lateral end for accepting an orthopedic bone plate having a crescent-shaped cross section, further including an aperture axis symmetrically bisecting the front aperture opening and passing from the lower curvilinear side of the front aperture opening to the upper curvilinear side, wherein the front aperture opening is rotated so that its aperture axis is disposed at a non-zero positioning angle relative to the longitudinal axis. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A plate bending system comprising in combination:
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a first elongate bending member having a longitudinal axis, said first elongate bending member having first and second opposing major surfaces along said longitudinal axis and first and second lateral ends, said first member having a front aperture opening located on the first major surface adjacent the first lateral end, and a back aperture opening located on the second major surface having a substantially identical shape as and offset from the front opening, wherein the back and front openings are spanned by an aperture which extends through the first bending member from the front opening to the back opening at an oblique angle as measured relative to a perpendicular of the longitudinal axis of the elongate rigid member; a second elongate bending member having a longitudinal axis, said second elongate bending member having third and fourth opposing major surfaces along said longitudinal axis and third and fourth lateral ends, said second member having a front aperture opening located on the third major surface adjacent the third lateral end, and a back aperture opening located on the fourth major surface having a substantially identical shape as and offset from the front opening, wherein the back and front openings are spanned by an aperture which extends through the second bending member from the front opening to the back opening at the oblique angle; and a malleable plate received within the aperture openings of the first and second bending members, said plate having an interposed segment adjacent and between the front aperture openings of the first and second bending members wherein said first and second bending members extend away from one another at twice the oblique angle of the aperture so that movement of the second and fourth lateral ends through an arcuate path toward each other places a bending force on the interposed segment of the malleable plate. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A plate bending system comprising in combination:
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a first elongate bending member having first and second substantially opposed major surfaces and first and second lateral ends, said first member having a front aperture opening located on the first major surface adjacent the first lateral end, and a back aperture opening located on the second major surface wherein the back and front openings are spanned by an aperture which extends through the first bending member from the front opening to the back opening, the first member further including a longitudinal axis passing from the first to the second lateral ends of the member; a second elongate bending member having third and fourth substantially opposed major surfaces and third and fourth lateral ends, said second member having a front aperture opening located on the third major surface adjacent the third lateral end, and a back aperture opening located on the fourth major surface wherein the back and front openings are spanned by an aperture which extends through the second bending member from the front opening to the back opening, the second member further including a longitudinal axis passing from the third to the fourth lateral ends of the member; a malleable plate having a cross section received within the aperture openings of the first and second bending members, said plate having an interposed segment adjacent the front aperture openings of the first and second bending members wherein the front aperture openings of the first and second bending members are each rotated by a positioning angle relative to the longitudinal axis of the member such that the transverse axis of the interposed segment of the plate is disposed at the positioning angle of between 0 and 89 degrees with respect to the longitudinal axis of the first and the second elongate bending members. - View Dependent Claims (19, 20, 21, 22)
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23. A method for bending orthopedic plates for accurate fitting to an irregularly shaped bone using a pair of elongate bending members, each member having substantially opposed major surfaces along a longitudinal axis spanning top and bottom lateral ends, each member further having an aperture extending through said member adjacent the top lateral end at an oblique angle as measured from a perpendicular to the longitudinal axis of the respective bending member, the method comprising:
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fully enclosing within each of the apertures a first and second received segments along the length of the orthopedic plates, each received segment separated by an exposed length of the orthopedic plate, each of said segments having a first bending end adjacent the exposed length of the plate and a second bending end; and applying similarly directed force to each of the first bending ends and equal and opposite force to each of the second bending ends thereby causing the orthopedic plate along the interposed length between the two received segments to bend in a direction consistent with the force applied to the first bending ends of the received segments. - View Dependent Claims (24, 25, 26)
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Specification