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US 8,998,999 B2Granted
Hammertoe implant
AssigneeOrthohelix Surgical Designs, Inc.
InventorsDerek S. Lewis, Amanda M. Martin, James P. Price, Michael A. Zwolinski, David B. Kay
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AssigneeOrthohelix Surgical Designs, Inc.
InventorsDerek S. Lewis, Amanda M. Martin, James P. Price, Michael A. Zwolinski, David B. Kay
Estimating the term…
The invention comprises an implant having a first end section and a second end section, where the first end has a cancellous thread for implantation in a first section of bone and the second end includes expansion slots and barbs or wings, that that resist movement out of a second section of bone. These anchors expand outwardly when a rigid wire, such as a k-wire is fed through a central cannulation in the implant and either the wire expands in diameter or the cannulation decreases in diameter. The implant also includes a collar intermediate to the first and second section which includes one or more surfaces to allow the first section to be screwed into a first bone section.
A fusion implant system comprising a rigid wire having an external diameter and an implant having a first end section including a threaded portion that is capable of being implanted in a first bone section and an integral second end section comprising at least two fingers that apply a radially outward force that is capable of holding an object in relation to the first bone section, where the implant has a central cannulation having a first internal diameter that is sufficiently large to accommodate the diameter of the rigid wire and which extends through the first and second end sections and the implant includes a radial expansion mechanism in which either the cannulation has a reduction in diameter in the second end section from the first diameter to a second diameter which is smaller than the diameter of the rigid wire, or the rigid wire has an increase in external diameter which is greater than the first internal diameter of the central cannulation, and each of the fingers of the second end section has an external surface which includes an anchoring barb member that deflects radially outwardly when radial expansion mechanism is activated.
An implant having a longitudinal axis and a first end section having an external thread and an integral second end section, the second section having a cylindrical base having at least one barb comprising a radially extending conical surface which has a larger diameter in the direction extending from the second end section to the first end section and the implant has a central cannulation along the longitudinal axis and wherein the cylindrical base of the second section includes at least two radial expansion slots which are placed radially symmetrically about the longitudinal axis of the second section whereby the at least one barb thereby has fingers which can flex radially inward to enable the second end section to be inserted into a pre-drilled hole and the cannulation in the second end section includes a restriction in the diameter of the cannulation whereby the barb flexes radially outward in response to a guide wire being driven through the restriction.
Dependencies are inferred from the claim text.