Instruments for minimally invasive valve surgery, namely, hooks, spatulas, retractors, clamps, scissors, needle holders, graspers, knot pushers, blades with holders and introducers, rongeurs, instrument holders, endoscope holders, endoscopes, trocars, suture rulers, linear scalers and sizers, cadioplegia needles, vessel hooks, suture catchers, magnetic retrievers and scalpel blade holders