Cement-directing orthopedic implants
First Claim
Patent Images
1. A method of treating a vertebral body comprising the steps of:
- creating a cavity in a vertebral body;
inserting a collapsible multi-layered braided mesh structure into the cavity, wherein (i) the multi-layered braided mesh structure comprises at least one primary member and at least one secondary member, (ii) the secondary member has been removed in at least one region of the mesh structure to form at least one cement flow window therethrough, and (iii) the primary member remains over the at least one cement flow window; and
injecting a bone cement into the braided mesh structure, wherein the bone cement flows preferentially out of the braided mesh structure through the at least one flow window.
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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
26 Claims
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1. A method of treating a vertebral body comprising the steps of:
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creating a cavity in a vertebral body; inserting a collapsible multi-layered braided mesh structure into the cavity, wherein (i) the multi-layered braided mesh structure comprises at least one primary member and at least one secondary member, (ii) the secondary member has been removed in at least one region of the mesh structure to form at least one cement flow window therethrough, and (iii) the primary member remains over the at least one cement flow window; and injecting a bone cement into the braided mesh structure, wherein the bone cement flows preferentially out of the braided mesh structure through the at least one flow window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of treating a vertebral body comprising the steps of:
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creating a cavity in a vertebral body; inserting a collapsible self-expanding multi-layered braided mesh structure into the cavity in a collapsed configuration; allowing the mesh structure to self-expand to an expanded configuration within the cavity without substantially distracting material outside the boundary of the cavity; and injecting a bone cement into the expanded braided mesh structure, wherein the braided mesh structure comprises regions of different permeability to the bone cement and wherein the bone cement flows preferentially out of the braided mesh structure through at least one region of greater permeability. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An expandable orthopedic device adapted for placement in a cavity formed in bone, comprising:
a collapsible, self-expanding multi-layered braided mesh structure at least partially permeable to a bone cement, wherein (i) the multi-layered braided mesh structure comprises at least one primary member and at least one secondary member, (ii) the at least one secondary member has been removed in at least one region of the mesh structure to form at least one cement flow window therethrough, and (iii) the primary members remain over the at least one cement flow window. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
Specification