Helical osteosynthetic implant
First Claim
1. A nail for setting a broken bone, the nail comprising:
- a shaft defining a helical axis;
a uniform pair of blades disposed on the shaft; and
a tapered pair of blades disposed on the shaft such that each tapered blade is positioned between the uniform pair of blades, the tapered blades having a greatest width at a distal portion and a smallest width at a proximal portion, the uniform and tapered blades having a total helical twist of at least about 30°
around the helical axis.
1 Assignment
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Accused Products
Abstract
An osteosynthetic implant for setting a broken bone. The implant comprises a nail having a plurality of helically twisted blades that share a common helical axis. At least two of the blades define an angle of less than 180° in a plane perpendicular to the helical axis. In a preferred embodiment, one pair of the blades of the nail is tapered towards its proximal portion and another pair has a uniform thickness. The blades are twisted by at least about 30°. A cannulation runs through the center of the nail to receive a guide wire. The nail is slidably engageable to a member that is securable to an elongated portion of the bone, such as a side plate or an intramedullary nail. In a preferred implantation orientation, the proximate portion of the tapered blades is parallel to the elongated portion of the bone, and a proximate portion of the uniform blades is perpendicular thereto.
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Citations
21 Claims
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1. A nail for setting a broken bone, the nail comprising:
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a shaft defining a helical axis; a uniform pair of blades disposed on the shaft; and a tapered pair of blades disposed on the shaft such that each tapered blade is positioned between the uniform pair of blades, the tapered blades having a greatest width at a distal portion and a smallest width at a proximal portion, the uniform and tapered blades having a total helical twist of at least about 30°
around the helical axis. - View Dependent Claims (2, 3, 4)
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5. A nail for setting a broken bone, the nail comprising first and second blades which are helically twisted along first and second coaxial helixes respectively and configured for implantation in a bone fragment, the first and second coaxial helixes being less than 180°
- out of phase, wherein the second blade is tapered along the second coaxial helix and has a different shape than the first blade.
- View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A nail for setting a broken bone, the nail comprising first and second blades which are helically twisted along first and second coaxial helixes respectively and configured for implantation in a bone fragment, the first and second coaxial helixes being less than 180°
- out of phase, wherein the second blade is tapered and has a proximal portion and a distal portion that is wider than the proximal portion.
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21. A method of setting a broken femur having a head on a proximal side and a shaft on a distal side, the method comprising:
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providing a nail with a helical axis, a uniform pair of blades, and a tapered pair of blades disposed such that each tapered blade is positioned between the uniform pair of blades, the tapered blades having a greatest width at a distal portion and a smallest width at a proximal portion, wherein the uniform and tapered blades have a total helical twist of at least about 30°
around the helical axis; andimplanting the nail in the femur with the proximal portion of the tapered blades inside the head of the femur and substantially parallel to the shaft of the femur, and with the distal portion of the tapered blades disposed towards the distal side of the femur and substantially perpendicular to the shaft of the femur.
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Specification