Pulmonary angioscopy has been shown to have a clinically useful role in the diagnosis of causes of chronic pulmonary artery obstruction and in determining operability. These results are based on the use of traditional medical endoscope technology and a distal view-ing balloon. While the technique is clinically useful, modifications are needed to make the technique more readily available to clinicians. Needed modifications include narrower bundles, improved flexibility of the bundle, and a secure (preferably disposable) mechanism of balloon attachment. These changes need to occur without sacrifice of current optics or distal tip deflection. These changes appear to be possible and would facilitate the wide-spread use of angioscopy in a large volume, branching vascular bed.