Methods and devices for less invasive glenoid replacement
AssigneeShoulder Innovations, Inc.
InventorsStephen B. Gunther, Desmond O'Farrell, Mark Edwin Zyzelewski, Andrew John Rodenhouse
Life of this patent
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Abstract
The invention relates to a glenoid (shoulder socket) implant prosthesis, a humeral implant prosthesis, devices for implanting glenoid and humeral implant prostheses, and less invasive methods of their use for the treatment of an injured or damaged shoulder.
Claims29
A method of treating a patient, comprising the steps of:
- identifying a patient having a glenoid surface;
- surgically exposing the glenoid surface,
- reaming a circular cavity into the glenoid surface;
- and
- inserting a glenoid implant into the cavity, the medial aspect of the implant having a circular geometry complimentary to that of the reamed bone cavity, such that at least a portion of a circular peripheral edge of the implant resides below the adjacent glenoid surface and the portion residing below the adjacent glenoid surface is circumferentially surrounded by cortical bone of the glenoid.
A glenoid implant, comprising:
- a circular body, having a medial surface, an articulating surface, a peripheral edge, and a central axis;
- a post on the medial surface, disposed concentrically on the central axis;
- and
- at least one axially extending flange extending from the medial surface at the peripheral edge of the circular body.
A glenoid implant, comprising:
- a circular body, having a medial surface, an articulating surface, a peripheral edge, and a central axis;
- a post on the medial surface, disposed concentrically on the central axis;
- and
- a first thickness measured in the axial direction at a first point on the peripheral edge, and a second thickness measured in the axial direction at a second point on the peripheral edge spaced apart from the first point by 180 degrees;
- wherein the first thickness is at least about 125% of the second thickness.
A method of treating a patient, comprising the steps of:
- exposing a glenoid surface;
- reaming a circular depression in the glenoid surface;
- providing a glenoid implant having a circular peripheral edge and a nonspherical concavity with an articulating surface, the concavity having an axis of rotation which is angularly offset from an axis of the circular peripheral edge;
- positioning the circular peripheral edge at least partially within the circular depression;
- and
- rotating the implant to direct the axis of rotation to a desired position.
A method of treating a patient, comprising the steps of:
- making a skin incision;
- exposing a glenoid surface through the incision;
- introducing a reamer through the incision and reaming a circular depression in the glenoid surface;
- and
- introducing a glenoid implant through the incision and positioning the glenoid implant at least partially within the depression;
- wherein the incision is no more than about 100 mm in length.
A cement construct for retaining an implant within a cavity in bone, comprising:
- a cement shell, having a concave side corresponding to the configuration of an implant and a convex side corresponding to the configuration of a prepared cavity in a bone, the concave side having an axis of rotational symmetry;
- a first tubular wall section concentrically disposed about the axis,
- a substantially planar section extending radially outwardly from an end of the first tubular wall section and transverse to the axis;
- and
- a second tubular wall section concentrically disposed about the axis and extending axially from a peripheral edge of the planar section;
- wherein the second tubular wall section extends at least about 180 degrees around the axis.
A method of preparing a glenoid surface for implantation of a glenoid implant, comprising the steps of:
- reaming a circular depression in the glenoid surface, to produce a reduced glenoid surface having an axis of rotation;
- reaming a bore coincident with the axis and below the level of the reduced surface;
- and
- reaming an annular channel, concentrically positioned about the axis and below the level of the reduced surface.
Dependencies are inferred from the claim text.