A new type of endovascular prosthesis has been developed using a unique metal alloy (nitinol) with a heat-sensitive memory. Nitinol wire coil grafts were straightened in ice water and passed into the canine aorta via catheter, where they reformed into their original shapes. Follow-up aortograms demonstrated long-term patency with minimal thrombus formation. Nitinol endovascular coil grafts may eventually be used in the nonsurgical treatment of several forms of vascular disease.
Endoluminal bypass with a percutaneously delivered stent-graft is feasible. Technical results are good, and the number of complications is few at the iliac level. At the femoropopliteal level, patency is not as good and the number of complications is higher.
A percutaneous technique is described for the introduction of Kimray-Greenfield filters into the vena cava through either the internal jugular or femoral approach.
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