Medical devices for use in cardiology; medical devices, namely, tools for the removal of cardiac leads related to cardiac pacemakers from cardiac veins and tissue, tools for the removal of cardiac leads related to defibrillators from cardiac veins and tissue, tools for the removal of cardiac leads, indwelling catheters, and foreign objects; medical devices, namely, tools for steering cardiac lead extraction devices, tools for cutting or manipulating cardiac leads, tools for holding and pulling cardiac leads, tools and sensors for sensing progress and providing feedback to the user in cardiac procedures for the removal of cardiac leads related to cardiac pacemakers and defibrillators from cardiac veins and tissue; structural parts and fittings thereof; replacement parts and fittings thereof