A balloon catheter for use with an introducer having an inner diameter comprising: an outer catheter; a resilient inner catheter telescopically disposed in the outer catheter and extending distally therefrom, an annular space defined between the inner and outer catheters; and a distal, inflatable balloon having one end of the balloon coupled to the inner catheter and an opposing end of the balloon coupled to the outer catheter, the balloon having an interior fluidicly communicating with the annular space between the inner and outer catheters, the inner catheter being automatically adjustable to the balloon shape on inflation and deflation, the balloon being attached at its corresponding ends to both of the corresponding inner and outer catheters, so that on inflation of the balloon the inner catheter is bucklable inside the outer catheter, the balloon having a balloon diameter-to-length aspect ratio being equal to or greater than 1, wherein the self-adjusting inner catheter is configured to automatically fold the balloon about the inner catheter on distal extension of the inner catheter from the outer catheter when the balloon is deflated, so that the outer and inner catheters and the deflated balloon fit through and are disposable through the introducer, and further where the balloon is wrapped onto the inner catheter so that when inflated the balloon rotates and/or pulls the inner catheter inside the outer catheter thereby buckling the proximal portion of the inner catheter within the outer catheter; and the buckling of the proximal portion of the inner catheter within the outer catheter providing a means for storing rotational and/or axial energy when the balloon is inflated and releasing the stored energy when the balloon is deflated to collapse and to closely wrap the balloon back onto the inner catheter. an outer catheter; a resilient inner catheter telescopically disposed in the outer catheter and extending distally therefrom, an annular space defined between the inner and outer catheters; and a distal, inflatable balloon having one end of the balloon coupled to the inner catheter and an opposing end of the balloon coupled to the outer catheter, the balloon having an interior fluidicly communicating with the annular space between the inner and outer catheters, the inner catheter being automatically adjustable to the balloon shape on inflation and deflation, the balloon being attached at its corresponding ends to both of the corresponding inner and outer catheters, so that on inflation of the balloon the inner catheter is bucklable inside the outer catheter, the balloon having a balloon diameter-to-length aspect ratio being equal to or greater than 1, wherein the self-adjusting inner catheter is configured to automatically fold the balloon about the inner catheter on distal extension of the inner catheter from the outer catheter when the balloon is deflated, so that the outer and inner catheters and the deflated balloon fit through and are disposable through the introducer, and further where the balloon is wrapped onto the inner catheter so that when inflated the balloon rotates and/or pulls the inner catheter inside the outer catheter thereby buckling the proximal portion of the inner catheter within the outer catheter; and the buckling of the proximal portion of the inner catheter within the outer catheter providing a means for storing rotational and/or axial energy when the balloon is inflated and releasing the stored energy when the balloon is deflated to collapse and to closely wrap the balloon back onto the inner catheter. the buckling of the proximal portion of the inner catheter within the outer catheter providing a means for storing rotational and/or axial energy when the balloon is inflated and releasing the stored energy when the balloon is deflated to collapse and to closely wrap the balloon back onto the inner catheter.