M.Sc Thesis

M.Sc StudentBen-Hamo Nethanel
SubjectCharacterization of Venous Graft Wall Motions as an
Indicator of the Quality of its Distal
Anastomosis in Coronary Artery Bypass
DepartmentDepartment of Mechanical Engineering
Supervisors PROFESSOR EMERITUS Gad Hetsroni (Deceased)
Full Thesis text - in Hebrew Full thesis text - Hebrew Version


An essential parameter in assessing anastomosis quality and grafts petancy is associated with the graft flow rate measured by the end of the operation. To date, no objective method to determine the quality of the anastomosis graft and to obtain graft flow rate has been endorsed by the medical community. This paper describes a non-invasive technique for measuring the integrity of a venal graft in a coronary artery bypass upon conclusion of surgery. An in vitro laboratory setup was designed to illustrate the dynamic conditions in a coronary by-pass graft. Experiments were conducted for a graft with constant flow and for a graft with pulsatile flow. Behavior of the vein wall was examined when both ends of the graft were open to flow, and also when one end of the graft was occluded. The dynamic behavior of the graft was found to change as a function of graft patency and venal pressure. A correlation was confirmed between the signal of oscillation frequency obtained from the camera and the change in pressure at vein exit.