An adjustable catheter balloon is composed of an inflatable balloon, a flexible conduit and a handle. The inflatable balloon is attached to the distal end portion of the flexible conduit and the flexible conduit carries therewithin the core wire that moves independently within the flexible conduit and is moved using the handle. The balloon is inflated using a syringe that is connected to the handle which provides a relative movement of the core wire within the flexible conduit translating into changes in the length and contour of the balloon. This allows a diameter decrease of the adjustable catheter balloon and easier passage of the deflated balloon through a narrow working channel of an endoscopic device or a catheter. In addition we would have an increase in the diameter of the inflated balloon inside the body cavity by compressing the balloon longitudinally using the movement of the handle.