Patent ID: 8414591

Claim:
A patient-specific surgical guiding tool for a head of a major limb bone, for which a central axis can be determined comprising: (i) a guiding component for guiding a surgical instrument, (ii) a cutting component comprising two or more cutting elements having edges, 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 spanning at least a part of the contour of the neck of the bone but retaining an opening which allows passage of the neck at at least its smallest diameter and comprising a patient-specific component, and (iv) a connecting structure connecting said 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 allowing the passage of the bone head and ensuring placement of the guiding component on the bone head upon placement of the collar on the bone neck, whereby lines connecting the edges of said aperture and said central axis of the head of the bone form an angle for which an interior bisector can be determined, wherein at least two of the two or more cutting elements are positioned each at a different side of said at least one aperture and each at a maximal angle of 90 degrees from said interior bisector of the angle formed by the lines connecting the edges of the aperture and the central axis of the head of the bone upon placement of the surgical guiding tool on the bone head, wherein the guiding tool has a central axis that corresponds to the central axis of the collar and is oriented perpendicular to a cross-section the collar, and wherein edges of said two or more cutting elements are positioned in a plane perpendicular to the central axis of the guiding tool.