Multi-start closures for open implants
OwnerRoger P. Jackson, James L. Surberinventors
Life of this patent
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Abstract
An open implant closure structure includes a helically wound guide and advancement structure having at least two helically wound forms thereon providing a multi-start closing mechanism for use between spaced arms of a cooperating open medical implant having mating helically wound structure thereon. Illustrated structures include interlocking flange forms, v-threads, square threads, reverse angle threads and buttress threads and receivers with break-off extensions and cooperating tooling.
Claims22
In a medical implant having a substantially cylindrical closure member and a receiver member having first and second spaced arms forming an open channel, the closure member having an axis of rotation for closing the open channel, the improvement comprising:
- a) first and second helically wound forms located on the closure member, the first form having a first start and the second form having a second start;
- and
- b) a first discontinuous helically wound structure on the receiver first arm and a second discontinuous helically wound structure on the receiver second arm and wherein simultaneous mating of the first start with the arm first helically wound structure and the second start with the arm second helically wound structure occurs when the closure member is rotated between the first and second arms of the receiver member.
A medical implant comprising:
- a) a receiver having a body and a pair of upstanding spaced arms forming a channel for receiving a longitudinal connecting member, each arm having an inwardly facing surface with a first discontinuous helically wound guide and advancement structure located thereon;
- and
- b) a closure structure having a cylindrical body and a second helically wound guide and advancement structure having at least two starts.
In a medical implant, the improvement comprising:
- a) an open receiver member with spaced arms having inwardly facing surfaces, each with a helically wound guide and advancement form located thereon;
- and
- b) a helically wound multi-start closure member having an axis of rotation, the closure member rotatably mounted on the receiver member at the spaced arm inwardly facing surfaces.
In a polyaxial bone anchor having a shank and a receiver, the shank being pivotable with respect to the receiver prior to locking of a position of the shank with respect to the receiver, the improvement wherein:
- a) the receiver has spaced arms having inwardly facing surfaces, each surface having a helically wound guide and advancement form located thereon, each guide and advancement form being sized and shaped to mate with a helically wound multi-start closure member having at least two starts.
Dependencies are inferred from the claim text.