Patent ID: 9216026
Filing Date: 2015-12-22
Classification: A61B,A61F

Abstract:
1. A femoral sizing guide for locating an alignment axis on a planar resected femoral surface at a distal end of a femur that is transverse to the longitudinal axis of the femur, the distal end of the femur having an anterior cortex, the femoral sizing guide comprising: a body comprising: a foot component having a first surface arranged to rest against the resected femoral surface, the foot component further comprising first and second feet arranged to extend underneath respective posterior condyles and rest against posterior condylar surfaces of the femur; an extension component coupled to the foot component such that the extension component can rotate relative to both feet of the foot component; and a locking mechanism arranged to selectively restrict rotation between the foot component and the extension component; a superstructure slidably coupled to the extension component in a direction substantially parallel to the resected femoral surface; and a stylus coupled to the superstructure and arranged such that when the body rests against the resected femoral surface a tip of the stylus extends over the femur such that sliding the superstructure towards the feet causes the stylus tip to contact the anterior cortex of the femur at a level; wherein the superstructure further comprises a first set of spaced guide holes defining a first alignment axis at a predetermined distance from the level of the stylus tip in the plane of the resected femoral surface; wherein the extension component includes a pair of spaced sleeves that define a second set of guide holes defining a second alignment axis, the distance between the first and second sets of guide holes varying as the superstructure slides relative to the body; wherein portions of the sleeves of the extension component extend into spaced arcuate grooves in the foot component, the spaced arcuate grooves defining arcuate paths; and wherein portions of the sleeves of the extension component move along the arcuate paths defined by the arcuate grooves in the foot component when the extension component rotates with respect to the feet of the foot component.