You wanted to test implant A, but you unintentionally used implant B in half of your experiments is not "learning". Unless you needed to learn Surgery 101 like

You wanted to test implant A, but you unintentionally used implant B in half of your experiments is not "learning". Unless you needed to learn Surgery 101 like maintaining and going through checklists, but then you are grossly ill-equipped to be doing neurosurgery.