Dynamic fixation assemblies with inner core and outer coil-like member
First Claim
1. In a medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
- a) an inner cylindrical core with an axis and a discrete attachment location;
b) an outer coil-like member attachable to the cylindrical core at the attachment location, the cylindrical core receivable in the coil-like member along a substantial length thereof, the outer coil-like member being in sliding engagement with the cylindrical core in both a direction along the axis and torsionally when the core is fixed to the coil-like member at the core attachment location and the outer coil-like member is clamped to at least one of the bone attachment structures; and
c) first and second compression members disposed in at least one of the bone attachment structures, each compression member having an inner surface sized and shaped for frictional engagement with the outer coil-like member, the first and second compression members cooperating to clamp only the outer coil-like member to the bone attachment structure, the outer coil-like member remaining slidable with respect to the inner core.
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Accused Products
Abstract
A dynamic fixation medical implant includes a longitudinal connecting member assembly having an elongate coil-like outer member and an inner cylindrical core attached to the outer member at only one end thereof. Some assemblies include a second longitudinal connecting member in the form of a rod that is fixed to the inner core and extends outwardly from the assembly. Certain assemblies include a threaded core or threaded inserts that cooperate with a helical slit of the coil-like outer member. Two or more cooperating bone screw assemblies attach to the connecting member assembly. The bone screw assemblies may include upper and lower compression members for affixing to and cradling the coil-like outer member only, allowing relative movement between the outer member and the inner cylindrical core. Press fit or snap-on features attach one end of the coil-like outer member to one end of the inner cylindrical core.
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Citations
24 Claims
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1. In a medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises:
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a) an inner cylindrical core with an axis and a discrete attachment location; b) an outer coil-like member attachable to the cylindrical core at the attachment location, the cylindrical core receivable in the coil-like member along a substantial length thereof, the outer coil-like member being in sliding engagement with the cylindrical core in both a direction along the axis and torsionally when the core is fixed to the coil-like member at the core attachment location and the outer coil-like member is clamped to at least one of the bone attachment structures; and c) first and second compression members disposed in at least one of the bone attachment structures, each compression member having an inner surface sized and shaped for frictional engagement with the outer coil-like member, the first and second compression members cooperating to clamp only the outer coil-like member to the bone attachment structure, the outer coil-like member remaining slidable with respect to the inner core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. In a medical implant assembly including at least two bone attachment structures, the improvement comprising:
a) a longitudinal connecting member having i) a cylindrical core with an axis, a thread and a first end; and ii) an outer coil-like member having a second end, the outer coil-like member fixed to the cylindrical core only near the second end, the cylindrical core and the thread being receivable in the coil-like member along a substantial length thereof with at least a substantial portion of the thread being spaced from the coil-like member, the coil-like member being in sliding engagement with the core in both a direction along the axis and torsionally when the first end is fixed with respect to the second end; and iii) first and second compression members disposed in each of the bone attachment structures, each compression member having an inner surface sized and shaped for frictional engagement with the outer coil-like member, the first and second compression members cooperating to clamp only the outer coil-like member to the bone attachment structure with the cylindrical core and thread remaining slidable with respect to the outer coil-like member.
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24. In a medical implant assembly including at least two bone attachment structures, the improvement comprising:
a) a longitudinal connecting member having i) a cylindrical core with an axis, a thread and a first end; ii) an outer coil-like member having a second end, the outer coil-like member fixed to the cylindrical core only near the second end, the cylindrical core and the thread being receivable in the coil-like member along a substantial length thereof with at least a substantial portion of the thread being spaced from the coil-like member, the coil-like member being in sliding engagement with the core in both a direction along the axis and torsionally when the first end is fixed with respect to the second end; and
wherein;iii) the first end is fixedly attached near the second end by at least one of a press fit engagement between a portion of the core and the coil-like member and a press fit between a portion of the thread and the coil-like member.
Specification