DUAL DILATION CATHETER AND MINIATURE BALLOON

摘要

A dual dilatation catheter assembly (11) having a first dilatation catheter (12) and a second dilatation catheter (13). The first dilatation catheter comprised of a first tubular element (16) having a lumen (17) extending therethrough and a second tubular element (18) extending coaxially over the first tubular element and forming a lumen (19) extending between the first and second tubular elements. A balloon (21) is carried by the second tubular element and has its interior in communication with the lumen extending between the first and second tubular elements. The second dilatation catheter extends through the lumen in the first tubular element of the first dilatation catheter and is comprised of a flexible elongate tubular element having a lumen extending therethrough, an inflatable balloon carried by the first tubular element of the second dilatation catheter, the balloon of the second dilatation catheter having a collapsed diameter which is less than the interior diameter of the lumen of which is less than the interior diameter of the lumen of the first tubular element of the first dilatation catheter whereby the second dilatation catheter can be inserted and removed from the first dilatation catheter.