Cement-directing orthopedic implants
First Claim
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1. A surgical method comprising:
- inserting a device into a cavity in a patient, wherein the device comprises a collapsible, self-expandable mesh structure having a first collapsed configuration and a second expanded configuration, said first collapsed configuration enabling the device to be inserted into the cavity through a cannula and said second expanded configuration being sufficient to maintain walls of the cavity apart from each other, wherein said mesh structure itself has regions of differential permeability or flow resistance, and wherein said mesh structure is a co-braided structure comprising primary members and secondary members occupying interstices between said primary members, and wherein said mesh structure has regions of decreased flow resistance in which secondary members are not present.
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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
20 Claims
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1. A surgical method comprising:
inserting a device into a cavity in a patient, wherein the device comprises a collapsible, self-expandable mesh structure having a first collapsed configuration and a second expanded configuration, said first collapsed configuration enabling the device to be inserted into the cavity through a cannula and said second expanded configuration being sufficient to maintain walls of the cavity apart from each other, wherein said mesh structure itself has regions of differential permeability or flow resistance, and wherein said mesh structure is a co-braided structure comprising primary members and secondary members occupying interstices between said primary members, and wherein said mesh structure has regions of decreased flow resistance in which secondary members are not present. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A surgical method comprising:
inserting a device into a cavity of a patient, wherein the device comprises a compressible, shape-restoring hollow mesh structure having a compressed shape and an expanded shape, wherein the compressed shape is capable of being inserted into and moved through a cannula, and the mesh structure includes a mesh area to create added flow resistance to bone cement inserted into the device, wherein said mesh structure itself has regions of differential permeability, and wherein said mesh structure is a co-braided structure comprising primary members and secondary members occupying interstices between said primary members, and wherein the device further comprises at least one baffle member configured to direct the flow of bone cement placed in the device toward preferred directions and to impede the flow of bone cement in non-preferred directions. - View Dependent Claims (12, 13, 14)
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15. A surgical method comprising:
- inserting into a cavity a device comprising a collapsible and self-expanding mesh framework, said device having regions of differential resistance to bone cement flowing therethrough, wherein said mesh structure is a co-braided structure comprising primary members and secondary members occupying interstices between said primary members, and wherein said interstices 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, wherein said device is hollow and has first and second ends, wherein at least one of the first and second ends is closed; and
injecting bone cement into the device while the device is within the cavity. - View Dependent Claims (16, 17, 18, 19, 20)
- inserting into a cavity a device comprising a collapsible and self-expanding mesh framework, said device having regions of differential resistance to bone cement flowing therethrough, wherein said mesh structure is a co-braided structure comprising primary members and secondary members occupying interstices between said primary members, and wherein said interstices 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, wherein said device is hollow and has first and second ends, wherein at least one of the first and second ends is closed; and
Specification