Bistable cement restrictor
AssigneeJohnson & Johnson Professional, Inc.
InventorsPierre S. Ostiguy, Brooke W. Mastrorio
Life of this patent
Estimating the term…
Abstract
A bistable cement restrictor is provided for creating a fixed obstruction at any selected point within a long bone, particularly at points beyond the isthmus of the bone. An exemplary cement restrictor includes a body having a first end and a second end. One or more bistable fins extend radially from the body and are movable from a first stable state to a stable state either mechanically or thermally. In the first stable state, the cement restrictor is narrower than in the second stable state. While the cement restrictor is readily transitionable from the first stable state to the second stable state, the transition can be irreversible.
Claims20
A cement restrictor comprising:
- a configurable structure having a first configuration that has a diameter with respect to a selected axis and a second configuration that has a second diameter with respect to the selected axis, the second diameter being greater than the first diameter,
- wherein the configurable structure includes a body having a first end and a second end;
- and a plurality of bistable fins extending radially from the body and being movable from a first stable state to a second stable state.
A cement restrictor comprising:
- a configurable structure having a first configuration that has a diameter with respect to a selected axis and a second configuration that has a second diameter with respect to the selected axis, the second diameter being greater than the first diameter,
- wherein the configurable structure includes a body having a first end and a second end and a plurality of bistable fins extending radially from the body and being movable from a first stable state to a second stable state, and
- wherein the fins include a shape memory alloy.
A cement restrictor comprising:
- a configurable structure having a first configuration that has a diameter with respect to a selected axis and a second configuration that has a second diameter with respect to the selected axis, the second diameter being greater than the first diameter,
- wherein the configurable structure includes a body having a first end and a second end and a plurality of bistable fins extending radially from the body and being movable from a first stable state to a second stable state, and
- wherein at least one of the fins includes barbs extending therefrom.
A cement restrictor comprising:
- a configurable structure having a first configuration that has a diameter with respect to a selected axis and a second configuration that has a second diameter with respect to the selected axis, the second diameter being greater than the first diameter,
- wherein the configurable structure includes a body having a first end and a second end and a plurality of bistable fins extending radially from the body and being movable from a first stable state to a second stable state, and
- wherein at least one the fins includes a plurality of radial cuts through the fin.
A cement restrictor comprising:
- a body having a first end and a second end;
- and
- a plurality of bistable fins extending radially from the body and being irreversibly movable from a first stable state to a second stable state,
- wherein the fins are concave with respect to the first end of the body in the first stable state,
- wherein the fins are convex with respect to the first end of the body in the second stable state, and
- wherein the diameter of each fin is larger in the second stable state than in the first stable state.
Dependencies are inferred from the claim text.