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US 12,496,105 B2Granted
Devices for generating and applying compression within a body
AssigneeArthrex, Inc.
InventorsMatthew Palmer, Matthew Fonte, Robert Devaney, Kaitlyn Nealon
Life of this patent
Estimating the term…
Abstract
This disclosure describes exemplary screw and intramedullary devices that are better able to bring bone fragments into close proximity with each other, generate a compressive load, and maintain that compressive load for a prolonged period of time while healing occurs. The devices are made of a shape memory material.
Claims15
An intramedullary fusion device, comprising:
- a shaft made of a shape memory material and defining a longitudinal axis, the shaft including a threaded end region, a barbed end region, a central bridge region, and a cannulation that extends through the barbed end region, the threaded end region, and the central bridge region, wherein the central bridge region includes a first end and a second end, the barbed end region includes a plurality of spaced apart barbs extending from the first end of the central bridge region that are radially spaced relative to the longitudinal axis, each of the plurality of spaced apart barbs includes a plurality of spaced barbed features axially spaced relative to the longitudinal axis, the central bridge region has a generally cylindrical shape and an outer diameter that is smaller than a major diameter of the threaded end region and a major diameter of the barbed end region, and the threaded end region is directly adjacent to the central bridge region;
- a first bone-engaging feature provided on the threaded end region, wherein the first bone-engaging feature includes a thread helically wrapped around the shaft at the threaded end region,
- wherein the plurality of spaced apart barbs are separated from one another by a slot that extends at least partially into the central bridge region;
- and
- a second bone-engaging feature provided on the barbed end region, the second bone-engaging feature movable between an unbiased condition in which it is co-radial with the longitudinal axis of the shaft and a biased condition in which a cross-sectional profile of the barbed end region is reduced, wherein the second bone-engaging feature occupies at least a portion of the cannulation when the second bone-engaging feature is in the biased condition, and the second bone-engaging feature returns to the unbiased condition following insertion into a bone.
2 more elements
An intramedullary fusion device, comprising:
- a shaft made of a shape memory material and defining a longitudinal axis, the shaft including a threaded end region, a barbed end region, and a central bridge region, wherein a cannulation extends through the barbed end region, the threaded end region, and the central bridge region, the central bridge region includes a first end and a second end, the barbed end region includes a plurality of spaced apart barbs extending from the first end of the central bridge region that are radially spaced relative to the longitudinal axis, each of the plurality of spaced apart barbs includes a plurality of spaced barbed features axially spaced relative to the longitudinal axis, the central bridge region has a generally cylindrical shape and an outer diameter that is smaller than a major diameter of the threaded end region and a major diameter of the barbed end region, and the threaded end region is directly adjacent to the central bridge region,
- wherein the plurality of spaced apart barbs are separated from one another by a slot that extends at least partially into the central bridge region;
- a first bone-engaging feature provided on the threaded end region;
- and
- a second bone-engaging feature provided on the barbed end region, the second bone-engaging feature movable between an unbiased condition in which it is co-radial with the longitudinal axis of the shaft and a biased condition in which a cross-sectional profile of the barbed end region is reduced.
2 more elements
An intramedullary fusion system, comprising:
- a delivery device including a recess and a drive feature;
- and
- an intramedullary fusion device removably held within the recess of the delivery device, wherein the intramedullary fusion device includes:
- a shaft made of a shape memory material and defining a longitudinal axis, the shaft including a threaded end region, a barbed end region, and a central bridge region, wherein a cannulation extends through the barbed end region, the threaded end region, and the central bridge region, the central bridge region includes a first end and a second end, the barbed end region includes a plurality of spaced apart barbs extending from the first end of the central bridge region that are radially spaced relative to the longitudinal axis, each of the plurality of spaced apart barbs includes a plurality of spaced barbed features axially spaced relative to the longitudinal axis, the central bridge region has a generally cylindrical shape and an outer diameter that is smaller than a major diameter of the threaded end region and a major diameter of the barbed end region, and the threaded end region is directly adjacent to the central bridge region,
- wherein the plurality of spaced apart barbs are separated from one another by a slot that extends at least partially into the central bridge region;
- a first bone-engaging feature provided on the threaded end region;
- and
- a second bone-engaging feature provided on the barbed end region, the second bone-engaging feature movable between an unbiased condition in which it is co-radial with the longitudinal axis of the shaft and a biased condition in which a cross-sectional profile of the barbed end region is reduced;
- and
- the drive feature of the delivery device is positioned between adjacent barbs of the plurality of spaced apart barbs of the barbed end region when the intramedullary fusion device is received within the recess of the delivery device.
7 more elements
Dependencies are inferred from the claim text.