Woven retention devices, systems and methods
Inventors
Assignees
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Publication Number
US-9532806-B2
Publication Date
2017-01-03
Expiration Date
Abstract
A woven retention device for interfacing with a bone surface includes interwoven filaments forming a tubular lattice with protuberances distributed on interior and exterior surfaces of the lattice at a predetermined spatial relationship. The protuberances are formed by intersecting interwoven filaments. The retention device receives and surrounds a fastener. In a first, relaxed state, the retention device has multiple combinations of filament cross-section geometries at the intersection points, and the multiple combinations of filament cross-section geometries form multiple protuberance thicknesses. In a second state when surrounding at least a portion of the fastener, the retention device distributes pressure from the fastener to multiple points of contact on the exterior surface of the retention device such that a spatial relationship of the protuberances changes as a function of bone density of the bone surface and as a function of an interfacing surface shape of the fastener.
Core Innovation
The invention provides a woven retention device for interfacing with a bone surface. The retention device includes a sleeve body made of a plurality of interwoven filaments that form a substantially tubular lattice, with protuberances distributed on an interior surface and an exterior surface at a predetermined spatial relationship and formed by an intersection point of two or more interwoven filaments.
The sleeve body includes interstices outlined by the interwoven filaments that allow for bone ingrowth. Any two interstices that share a common boundary have different sizes, and the sleeve body is configured to surround at least a portion of a fastener and includes a proximal end for receiving at least a portion of the fastener and a distal end distal to the sleeve body.
When the sleeve body surrounds at least a portion of the fastener, it distributes pressure from the fastener to multiple points of contact on the exterior surface. The spatial relationship of the plurality of protuberances changes as a function of bone density of the bone surface and as a function of an interfacing surface shape of the fastener.
Claims Coverage
Independent claim clm-00001 defines 4 core inventive features, supported by dependent claims that refine weave architecture and specify quantitative and structural constraints.
Woven tubular lattice sleeve with interior and exterior protuberances
A sleeve body comprising a plurality of interwoven filaments forming a substantially tubular lattice with a plurality of protuberances distributed on an interior surface and an exterior surface at a predetermined spatial relationship, where each protuberance is formed by an intersection point of two or more of the interwoven filaments.
Fastener-surrounding proximal and distal ends
A proximal end proximal to the sleeve body configured to receive at least a portion of the fastener, and a distal end distal to the sleeve body, with the sleeve body configured to surround at least a portion of the fastener.
Interstices for bone ingrowth with neighboring different sizes
Interwoven filaments outline interstices that allow for bone ingrowth, wherein any two interstices that share a common boundary have different sizes.
Pressure distribution to multiple exterior contact points with changing protuberance spatial relationship
When surrounding at least a portion of the fastener, the sleeve body distributes pressure from the fastener to multiple points of contact on the exterior surface such that the spatial relationship of the plurality of protuberances changes as a function of bone density of the bone surface and as a function of an interfacing surface shape of the fastener.
Overall, the claim coverage centers on a substantially tubular woven sleeve lattice with protuberances formed at filament intersections, interstices sized for bone ingrowth, and a pressure-distribution function that changes protuberance spatial relationships based on bone density and fastener interfacing surface shape.
Stated Advantages
Distributes pressure from the fastener to multiple points of contact on the exterior surface.
Changes the spatial relationship of the protuberances as a function of bone density and interfacing surface shape of the fastener.
Provides at least 10% more pullout force than the fastener alone in the bone hole.
Documented Applications
Interfacing a woven retention device with a bone surface using a fastener, including a screw fastener with a screw thread, for bone fixation.
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