Biomedical Engineering Reference
In-Depth Information
Table 8.1 Continued
Thoratec (bridge to transplantation)
Housing
Smooth-surfaced polished titanium alloy
Pumping chamber
Thoralon polyurethane
(blood sac)
Percutaneous cannula
Thoralon polyurethane with reinforcement and
polyester velour covering
Disk valves
Occluder material (pyrolytic carbon and Delrin)
TAH
CardioWest (SynCardia Systems Inc., Tucson, AZ)
Internal surface Lined with polyurethane
Diaphragm Four layer segmented polyurethane
Valves in the conduits Medtronic-Hall (Medtronic, Inc., Minneapolis, MN)
AbioCor (Abiomed Cardiovascular Inc., Danvers, MA)
All blood-contacting
Smooth polyurethane
surfaces (the two
blood pumps, four
trileaflet valves)
Inflow cuff to the
Textured surface Dacron atrial cuffs
outflow graft
Pump domes are
Stycast epoxy (most common used, highly
reinforced
versatile)
Table 8.2 Materials of third generation blood pumps
Axial flow rotor
Incor (BerlinHeart (German Heart Institute, Berlin)
Pump Titanium alloy
Blood contacting surfaces Heparin coated (Carmeda process)
Inflow and outflow cannula Medical grade silicon
Centrifugal rotor
Ventrassist (Ventrassist Division, Ventracor Ltd, Chatswood, NSW, Australia)
(long-term ventricular support)
Pump Titanium, aluminium, vanadium alloy
Blood-contacting surfaces Carbon coating
Inflow cannula 10mm internal diameter silicone
Outflow cannula 10mm gelatin-impregnated woven polyester graft
HeartMate III (Thermo Cardiosystems Inc.) (long-term ventricular support)
(magnetic levitation) (bearingless)
Pump
Titanium
Blood-contacting surfaces
Sintered titanium
Impeller
Smooth titanium
Outflow cannula
Woven polyester graft
8.4.1
Polymers
Polyurethane
Synthetic biomaterials include silicon rubber, polyvinylchloride (PVC), nylon,
polytetrafluoroethylene (PTFE), polyethylene teraphthalate (PET) and poly-
