protecting the unused distal end sheath 188 provides an added degree of rigidity and control to facilitate manipulation of the entire device then if necessary a simple tug of sheath 188 will disengage receiving end 196 from flange 194 uncovering the unused distal body portion for immediate use with this understanding of the structural features of these exemplary embodiments of the present invention their use can be understood as follows prior to performing surgery the dual headed catheters of the present invention are removed from any packaging and prepped for use in some instances the entire catheter with two dilatation balloons attached may be preassembled and removed from sterile factory packaging ready for use alternatively the disposable distal bodies will be removed from their packaging and affixed to the reusable central catheter body under aseptic conditions at the site of the surgery in such cases the disposable distal bodies are preferably coded to provide easy identification and allow rapid selection of the desired configuration for example in fig1 central catheter body portion 102 may have been autoclaved or otherwise sterilized at the hospital in this case disposable distal tubular bodies 104a 104b would be removed from sterile packaging and connected with central catheter body portion 102 in the operating area the catheter may be assembled simply by hand or by using tools especially adapted for the task and included in the packaging during use of the catheter configurations discussed above a guide wire is first positioned across the stenosis an optional protective layer is removed from inflation port 110b and inflation assembly 116 is then advanced along central catheter body.