Biomedical Engineering Reference
In-Depth Information
Table 8.1 Continued
Axial flow pumps
MicroMed DeBakey VAD (MicroMed Cardiovascular Inc., Houston, TX)
(can be used as bridge to transplant)
Pump unit Polished titanium
Inflow cannula Polished titanium
Outflow graft Dacron
Jarvik-2000 (Jarvik Heart Inc., New York, NY) (electromagnetically actuated)
(neodymium±iron±born magnet)
Pump and impeller
Titanium
Bearings
Ceramic
Blood-contacting
Highly polished titanium
surfaces
Thoratec HeartMate II LVAS (Thoratec Corp., Pleasanton, CA)
The internal pump
Textured with titaniummicrosphere coatings
surfaces, inlet outlet
elbows, cannula
Axial-flow rotary pump Titanium
Inlet and outlet cannula Woven Dacron (C.R. Bard, Haverhill, PA)
Outlet graft sheath for
Polypropylene
bend relief
Pulsatile flow
Pulsatile-paracorporeal devices
Abiomed BVS 5000i (Abiomed Cardiovascular, Inc., Danvers, MA)
Dual chamber Polyurethane
Thoratec (Thoratec Corporation, Pleasanton, CA) (paracorporeal VAD)
Pumping chamber
Thoralon polyurethane
(blood sac)
Housing Polycarbonate
Percutaneous cannula Thoralon polyurethane with reinforcement and
polyester velour covering
Valve housing Stainless steel
Disk valves Occluder material (pyrolytic carbon and Delrin)
Berlin Heart (German Heart Institute, Berlin)
Housing
Semi rigid polyurethane
Blood chamber/internal
Polyurethane/extremely smooth polyurethane
Inner surface
Heparin coated (Carmada method)
Cannula
Silicon rubber (no need heparin coating)
￿ ￿ ￿ ￿ ￿
Outflow graft
Dacron-velour covered sewing rim
Pulsatile-intracorporeal devices
Thoratec HeartMate XVE LVAS (Thoratec Corp., Pleasanton, CA)
Pump chamber
Titanium alloy
Inflow and outflow
Titanium cage that contains 25mm porcine
xenograft valve within a woven Dacron TM
conduit
-
fabric graft
Diaphragm A flexible polyurethane (separates the blood
chamber and the air chamber)
Blood chamber Textured surfaces (chamber promotes the
development of a cellular lining) (sintered
titanium and textured polyurethane)
Novacor (LVAS) (World Heart Corp., Oakland, CA)
Blood sac
Polyurethane
Inflow cannula
Low-porosity polyester
Integral wall
Gelatin-sealed polyester graft or Vascutek graft
Inflow conduit
PTFE
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