42 Science and technology services, namely, scientific research; Scientific and technological services, namely, research and design in the field of artificial heart valves; design of medical devices; research and development of medical devices; scientific and technological services, namely, scientific research relating to aortic, mitral or tricuspid valve replacement stents and parts and fittings therefor; Design of aortic, mitral or tricuspid valve replacement stents and parts and fittings therefor; scientific and technological services, namely, scientific research relating to catheters, balloon catheters, pigtail catheters and parts and fittings therefor, catheter guidance systems, guide wires for catheters and pigtail catheters, and parts and fittings therefor, flexible and non-flexible tips and tip ends for catheter delivery systems, and parts and fittings therefor, tips and tip ends for catheter delivery systems, comprising of one or more of a stent, valve, balloon, stent retaining mechanism, stent release mechanism and coolant, and parts and fittings therefor, catheter handles comprising of multiple parts for catheter apparatus, and parts and fittings therefor, flexible and non-flexible cartridges for catheter delivery systems, and parts and fittings therefor, cartridges for catheter delivery systems comprising of one or more of a stent, valve, balloon, stent retaining mechanism, stent release mechanism and coolant, and parts and fittings therefor, and structural parts for all of the foregoing goods; Design of catheters, balloon catheters, pigtail catheters and parts and fittings therefor, catheter guidance systems, guide wires for catheters and pigtail catheters, and parts and fittings therefor, flexible and non-flexible tips and tip ends for catheter delivery systems, and parts and fittings therefor, tips and tip ends for catheter delivery systems, comprising of one or more of a stent, valve, balloon, stent retaining mechanism, stent release mechanism and coolant, and parts and fittings therefor, catheter handles comprising of multiple parts for catheter apparatus, and parts and fittings therefor, flexible and non-flexible cartridges for catheter delivery systems, and parts and fittings therefor, cartridges for catheter delivery systems comprising of one or more of a stent, valve, balloon, stent retaining mechanism, stent release mechanism and coolant, and parts and fittings therefor, and structural parts for all of the foregoing goods; research and development of medical products, research and development in the field of cardiovascular prostheses and implantation systems