Woven retention devices, systems and methods
Inventors
Assignees
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Publication Number
US-9907593-B2
Publication Date
2018-03-06
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 provides a woven retention device for interfacing with a bone surface. The device includes a sleeve body comprising a plurality of sets of interwoven monofilaments that form a substantially tubular lattice with a plurality of protuberances distributed on an interior surface and an exterior surface of the tubular lattice at a predetermined spatial relationship. The plurality of sets of interwoven monofilaments have a plurality of different diameters, and the plurality of protuberances are formed by intersection points of the plurality of sets of the interwoven monofilaments.
In a first, relaxed state, the sleeve body has a plurality of combinations of filament cross-section geometries at the intersection points, and these combinations form a plurality of different protuberance thicknesses. A thickness of each protuberance is 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.
A related retention device is configured for interfacing with a bone surface and includes a substantially tubular lattice of interwoven fibers inserted into a bone tunnel. The tubular lattice includes a proximal end with a receiving portion configured to receive a fastener along a longitudinal axis, and the lattice includes an inner surface and an outer surface with spatially distributed protruding and recessed portions. These protruding and recessed portions interact with an outer surface of the fastener and with an interior bone surface, respectively, and are formed by intersecting points of interwoven fibers.
This transmission changes the spatial relationship of the protuberances according to a function of bone density and according to a function of an interfacing surface shape of the fastener. The device includes a degree of stability in a relaxed state and a degree of flexibility, such that distributed pressure is distributed to the outer contact points and a spatial relationship of the protruding and recessed portions changes according to a function of bone density and of the interfacing surface shape of the fastener.
Claims Coverage
The partial content identifies two independent claims. Each independent claim is centered on a woven tubular lattice retention device in which pressure transmitted from a fastener changes a spatial relationship of distributed contact features according to bone density and fastener interfacing surface shape, with defined inner and exterior distributed interfaces formed by intersections of interwoven fibers or monofilaments.
Woven tubular lattice with protuberances and pressure-dependent spatial change
A woven retention device having a sleeve body of plural sets of interwoven monofilaments forming a substantially tubular lattice with protuberances distributed on an interior and an exterior surface at a predetermined spatial relationship, where the protuberances are formed by intersection points of the monofilament sets; different monofilament diameters and relaxed-state filament cross-section geometry combinations define different protuberance thicknesses measured radially; and when a fastener is inserted into the tubular lattice, pressure from the fastener is transmitted such that the spatial relationship of the protuberances changes according to a function of bone density and an interfacing surface shape of the fastener.
Fiber lattice inserted into a bone tunnel with distributed protruding/recessed interfaces
A retention device including a substantially tubular lattice of interwoven fibers configured to be inserted into a bone tunnel, with a proximal receiving portion to receive a fastener along a longitudinal axis; an inner surface with spatially distributed interface protruding and recessed portions configured to interact with an outer surface of the fastener; and an outer surface with spatially distributed protruding and recessed multiple points of contact configured to interact with an interior bone surface, where the protruding and recessed multiple points are formed by intersecting points of the interwoven fibers; different fiber diameters and relaxed-state fiber cross-section geometry combinations form different protruding and recessed portion thicknesses measured radially; and stability and flexibility allow distributed interface pressure to be distributed to the outer contact points such that a spatial relationship of the protruding and recessed portions changes according to a function of bone density and according to a function of an interfacing surface shape of the fastener.
Across the two independent claims, the core inventive concept is a tubular lattice woven from interwoven monofilaments or fibers where intersection geometry and different diameters define thicknesses of distributed protuberances or protruding/recessed contact portions in a relaxed state. In a second state, pressure transmitted from a fastener causes the spatial relationship of these distributed features to change according to bone density and the fastener interfacing surface shape, using an inner interface with the fastener and an outer interface with the interior bone surface.
Stated Advantages
Improved screw pullout resistance in stripped or low-density conditions, including at least about 10% increased pullout force versus screw alone.
Documented Applications
Orthopedic fixation of bone using the woven retention device with a sleeve body surrounding at least a portion of a fastener.
Insertion into a bone tunnel for interfacing with a bone surface, including receiving a fastener along a longitudinal axis.
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