Patent ID: 8852198

Claim:
A patient-specific surgical guiding tool for a head and a neck of a major limb bone comprising: (i) a guiding component having a central axis for guiding a surgical instrument, wherein the surgical instrument has a central axis that corresponds to the central axis of the guiding component, (ii) a cutting component comprising two or more cutting elements having edges, the cutting component configured to be positioned so as to cut in the cartilage of the head of the bone upon placement of the surgical guiding tool on the bone head, (iii) a collar configured to span a contour of the neck of the major limb bone over about 180 degrees and further configured to retain an opening which allows passage of the neck at at least its smallest diameter and comprising a patient-specific component configured to directly interlock with a corresponding patient-specific surface on the neck of the major limb bone, (iv) a connecting structure configured to connect the collar to said cutting component and/or to said guiding component, such that said collar, said cutting component and said guiding component are interconnected; wherein said connecting structure forms at least one aperture configured to allow passage of the bone head and further configured to ensure placement of the guiding component on the bone head upon placement of the collar on the neck of the major limb bone, whereby lines connecting the edges of said aperture and said central axis of the guiding component form an angle for which an interior bisector can be determined, wherein the two or more cutting elements are positioned such that a cutting element is present at both sides of said at least one aperture and at a maximal angle of 90° from the interior bisector of the angle formed by the lines connecting the edges of the aperture and a central axis of the head of the bone upon placement of the surgical guiding tool on the major limb bone head, wherein the central axis of the guiding component is positioned in or in the extension of the central axis of the head of the major limb bone upon placement of the surgical guiding tool on the major limb bone head, wherein edges of said two or more cutting elements are positioned in a plane perpendicular to the central axis of the guiding component, and wherein said two or more cutting elements are interconnected by one or more ring structures configured to span the contour of the head of the major limb bone by at least 180 degrees.