Stable cartilage defect repair plug
First Claim
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1. A cartilage defect repair plug that extends along a longitudinal axis for distributing a load at a cartilage defect site, comprising:
- a first layer having a first width bound by a first wall defining a perimeter of the first layer, the first layer including a superior layer and an inferior layer each extending across the width of the first layer in a direction perpendicular to the longitudinal axis so as to form the perimeter of the first layer, the superior layer being formed from a first material and configured to engage cartilage and the inferior layer being formed from a second different material and configured to engage an underlying region of bone, the superior layer and inferior layer abutting each other in a stacked relationship along the longitudinal axis such that the inferior layer is positioned below the superior layer and a lower side of the superior layer abuts an upper side of the inferior layer, the inferior layer defining a first shoulder having a first bearing surface perpendicular to the longitudinal axis, the first layer including a first thickness extending along the longitudinal axis that is configured to extend from a region of cartilage at the cartilage defect site into the region of underlying bone at the defect site; and
a second layer having a second width bound by a second wall defining a perimeter of the second layer, the second layer abutting the inferior layer of the first layer to form a stacked relationship along the longitudinal axis, the second width of the second layer being smaller than the first width of the first layer, the second layer defining a second shoulder having a second bearing surface perpendicular to the longitudinal axis, the second shoulder being spaced inward from the first shoulder in a direction towards the longitudinal axis, wherein an opposite lower side of the inferior layer abuts the second layer.
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Abstract
An apparatus and method of distributing a load to a cartilage defect repair plug is provided. A load is applied to a first articulation layer. The load is distributed to a second layer and the load is transferred in the normal direction to the first density of subchondral bone. The load is distributed to a third layer and the load is transferred in the normal direction to a second density of subchondral bone. The load is then distributed to a fourth layer and the load is transferred in the normal direction to a third density of subchondral bone.
85 Citations
19 Claims
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1. A cartilage defect repair plug that extends along a longitudinal axis for distributing a load at a cartilage defect site, comprising:
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a first layer having a first width bound by a first wall defining a perimeter of the first layer, the first layer including a superior layer and an inferior layer each extending across the width of the first layer in a direction perpendicular to the longitudinal axis so as to form the perimeter of the first layer, the superior layer being formed from a first material and configured to engage cartilage and the inferior layer being formed from a second different material and configured to engage an underlying region of bone, the superior layer and inferior layer abutting each other in a stacked relationship along the longitudinal axis such that the inferior layer is positioned below the superior layer and a lower side of the superior layer abuts an upper side of the inferior layer, the inferior layer defining a first shoulder having a first bearing surface perpendicular to the longitudinal axis, the first layer including a first thickness extending along the longitudinal axis that is configured to extend from a region of cartilage at the cartilage defect site into the region of underlying bone at the defect site; and a second layer having a second width bound by a second wall defining a perimeter of the second layer, the second layer abutting the inferior layer of the first layer to form a stacked relationship along the longitudinal axis, the second width of the second layer being smaller than the first width of the first layer, the second layer defining a second shoulder having a second bearing surface perpendicular to the longitudinal axis, the second shoulder being spaced inward from the first shoulder in a direction towards the longitudinal axis, wherein an opposite lower side of the inferior layer abuts the second layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A cartilage defect repair plug that extends along a longitudinal axis for distributing a load at a cartilage defect site, comprising:
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first, second and third layers each having respective first, second and third diameters, where the second diameter is smaller than the first diameter and larger than the third diameter, each layer being bound by a wall defining a perimeter of the respective layer, the wall of each layer being parallel to the longitudinal axis, each of the first, second and third layers defining a shoulder having a bearing surface perpendicular to the longitudinal axis, the first, second and third layers being positioned relative to each other in a stacked relationship extending along the longitudinal axis to form a stepped cone geometry, the bearing surface of each respective layer being orthogonal to the respective wall of each layer; wherein the first layer includes a superior layer and an inferior layer, the superior layer being formed from a first material and configured to engage cartilage and the inferior layer being formed from a second, different material and configured to engage bone, the superior and inferior lavers having the same width in a direction perpendicular to the longitudinal axis such that the periphery of each of the superior and inferior layers forms part of the perimeter wall of the first laver, the inferior layer being disposed below the superior layer such that an upper side of the inferior layer abuts the superior layer and an opposite lower side of the inferior layer in a direction along the longitudinal axis abuts the second layer, the first layer being sized to extend from a region of cartilage at the cartilage defect site to a region of underlying bone at the defect site; wherein the superior layer of the first layer is formed of a different material than at least one of the second and third layers. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification