Patent ID: 6228120
Filing Date: 2001-05-08
Classification: A61B,A61F

Abstract:
A surgical device for the implantation of a total shoulder prosthesis, the device comprising:a shoulder prosthesis stem with a humeral rod and a metaphysical section angled in relation to said humeral rod and presenting an upper frontal face centered on an axis and inclined in relation to the humeral rod; said metaphysical section having a hemispherical cavity centered on said axis, and a tapped bore opening into the bottom of the hemispherical cavity and also centered on said axis;a humeral plate comprising:a hollow hemispherical ball joint having an axis of rotation and comprising an external face made to fit the cavity in the prosthesis stem and an internal face that defines a hemispherical bearing and has an axially drilled tapered bore;a tapered swivel having an axis of rotation eccentric by a distance d in relation to the axis of rotation of the ball joint; said tapered swivel being connected to the ball joint through a connecting section having a cross-section no larger than the maximum cross-section of said ball joint; the tapered swivel and connecting section having a through hole drilled through them that extends into the extension of the cavity of the ball joint;a locking unit comprising the following, arranged axially:a rod having a threaded lower section and a diameter matching that of the tapped bore in the prosthesis stem and smaller than the minimum diameter of the tapered bore in the ball joint of the humeral plate;a hemispherical ball joint made to fit the hemispherical portion of the ball joint of the humeral plate; anda screw head for the locking unit;the hemispherical cavity in the prosthesis stem, the external and internal faces of the ball joint in the humeral plate, and the ball joint of the locking unit being concentric around a point O when the locking unit is in locked position;a head with a concave upper wall designed to fit a shoulder socket and a lower wall with a tapered housing having a shape that matches the tapered swivel; andat least one trial head comprising a lower wall having the same size as that of the lower wall of the head with a tapered recess having a shape that matches that of the tapered swivel and an upper wall with a hole drilled therethrough that opens into said recess.