Woven retention devices, systems and methods
Inventors
Assignees
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Publication Number
US-11376051-B2
Publication Date
2022-07-05
Expiration Date
Abstract
A woven retention device for interfacing with a bone surface is provided that includes a sleeve body that can surround a fastener, a proximal end for receiving the fastener, and a distal end. The sleeve body includes interwoven monofilaments of different diameters forming a substantially tubular lattice with protuberances distributed on interior and exterior surfaces of the lattice at a predetermined spatial relationship. In a first state, the sleeve body has a plurality of combinations of filament cross-section geometries at the intersection points, forming a plurality of protuberance thicknesses as measured in a radial direction of the sleeve body. In a second state when a fastener is inserted into the tubular lattice, pressure from the fastener is transmitted to the tubular lattice such that the spatial relationship of the protuberances changes according to a function of bone density and an interfacing surface shape of the fastener.
Core Innovation
The invention relates to a retention device for interfacing with a bone surface. The retention device includes a sleeve body comprising a plurality of filaments that form a substantially tubular lattice wall and create a plurality of protuberances distributed on an interior surface and an exterior surface at a predetermined spatial relationship. The sleeve body surrounds at least a portion of a fastener and includes a proximal end configured to receive at least a portion of the fastener, and a distal end distal to the sleeve body.
At least two of the plurality of protuberances have different thicknesses measured in a radial direction relative a longitudinal axis of the sleeve body. The plurality of filaments outline a plurality of interstices that allow for bone ingrowth, wherein at least two of the interstices that share a common boundary have different sizes. The interstices and the plurality of protuberances are configured to improve interdigitation with the bone surface.
When the sleeve body surrounds at least a portion of the fastener, the sleeve body 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. This pressure distribution provides multiple exterior contact points while maintaining an interdigitation-focused structure.
Claims Coverage
The document includes one independent claim (clm-00001), which is the core claim for the bone-interface retention device. The claim includes four inventive features centered on a filament-based tubular lattice sleeve with interior and exterior protuberances of different radial thicknesses, differently sized interstices for bone ingrowth, and a pressure-driven change in protuberance spatial relationship as a function of bone density and fastener interfacing surface shape.
Dual-surface tubular lattice protuberances of different radial thickness
A retention device with a sleeve body comprising filaments forming a substantially tubular lattice wall and forming protuberances distributed on an interior surface and an exterior surface at a predetermined spatial relationship, wherein at least two protuberances have different thicknesses measured in a radial direction relative a longitudinal axis.
Differently sized interstices for bone ingrowth with shared boundaries
The filaments outline interstices that allow for bone ingrowth, wherein at least two interstices that share a common boundary have different sizes.
Pressure-distributed exterior contact that changes 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.
Interdigitation improvement by protuberances and interstices
The interstices and the plurality of protuberances are configured to improve interdigitation with the bone surface.
Independent claim coverage is anchored in a sleeve body forming a filament-based tubular lattice with interior and exterior protuberances, radial thickness differences, differently sized interstices for bone ingrowth, and a pressure-distribution behavior that changes protuberance spatial relationship as a function of bone density and fastener interfacing surface shape.
Stated Advantages
Improves interdigitation with the bone surface.
Documented Applications
Osteoporotic/low bone mineral density applications are positioned for the device.
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