Cement-directing orthopedic implants
First Claim
1. A device for use in treating orthopedic defects in a procedure comprising inserting the device into a pre-formed cavity within a bony member and injecting bone cement or other orthopedic filler material into an interior region of the device, said device comprising:
- a collapsible, self-expanding mesh structure having a first, collapsed configuration and a second, expanded configuration, said first, collapsed configuration enabling the device to be inserted into the pre-formed cavity through a cannula and said second, expanded configuration being sufficient to maintain walls of the cavity apart from each other;
wherein said device has regions of differential permeability or flow resistance to said bone cement or other orthopedic filler material such that when bone cement or other orthopedic filler material is injected into the interior region of the device, the bone cement or other orthopedic filler material flows out of the device in one or more predetermined preferred directions.
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Accused Products
Abstract
A cement-directing structure for use in cement-injection bone therapy includes a collapsible, self-restoring braided structure with regions of differential permeability to the bone cement. The regions of differential permeability may be provided by areas where the braided mesh density is greater or lesser than surrounding areas and/or by means of a baffle. After the structure is placed in a void within a bony structure, cement is injected into the interior of the structure then oozes out in preferred directions according to the locations of the regions of differential permeability.
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Citations
22 Claims
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1. A device for use in treating orthopedic defects in a procedure comprising inserting the device into a pre-formed cavity within a bony member and injecting bone cement or other orthopedic filler material into an interior region of the device, said device comprising:
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a collapsible, self-expanding mesh structure having a first, collapsed configuration and a second, expanded configuration, said first, collapsed configuration enabling the device to be inserted into the pre-formed cavity through a cannula and said second, expanded configuration being sufficient to maintain walls of the cavity apart from each other;
wherein said device has regions of differential permeability or flow resistance to said bone cement or other orthopedic filler material such that when bone cement or other orthopedic filler material is injected into the interior region of the device, the bone cement or other orthopedic filler material flows out of the device in one or more predetermined preferred directions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19)
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13. A cement-directing device, comprising
a) a compressible, shape-restoring hollow mesh structure having a compressed shape and an expended shape, wherein the compressed shape is capable of being inserted into and moved through a cannula, the expanded shape being approximately football-shaped, and the mesh structure having sufficiently open mesh area to create minimal added flow resistance to bone cement inserted into the device; - and
b) wherein the mesh structure has at least a first mesh opening size and a second mesh opening size, the first and second mesh opening sizes creating a composite flow resistance to bone cement, the first mesh opening size being selected to facilitate the flow of cement in preferred directions, and the second mesh opening size being selected to impede the flow of cement in non-preferred direction. - View Dependent Claims (20)
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14. A cement-directing device, comprising:
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a) a compressible, shape-restoring hollow mesh structure having a compressed shape and an expended shape, wherein the compressed shape is capable of being inserted into and moved through a cannula, the expanded shape being approximately football-shaped, and the mesh structure having sufficiently open mesh area to create minimal added flow resistance to bone cement inserted into the device; and
b) at least one baffle member attached to the hollow mesh structure and configured to direct the flow of bone cement in preferred directions and to impede the flow of bone cement in non-preferred directions. - View Dependent Claims (21)
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15. A cement-directing device suitable for use in repairing a bone defect, said device comprising a generally tubular, collapsible and self-expanding mesh framework, said device having regions of differential permeability or resistance to the flow of bone cement therethrough;
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wherein said mesh framework has interstices that are sized to permit a bone cement injection needle to pass through said mesh framework to inject bone cement into an interior cavity of said device; and
wherein bone cement that is injected into said interior cavity in sufficient quantity to extravasate out of said cavity extravasates preferentially through regions of greater permeability or lower resistance to the flow of bone cement;
whereby the direction of extravasation is controlled by the location of said regions of differential permeability. - View Dependent Claims (16, 17, 18, 22)
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Specification