A probe apparatus adapted for movement through a lumen, comprising: a linearly extendible and retractable element adapted for selective extension and retraction to provide the movement a front balloon positioned forward of the linearly extendible and retractable element and adapted for selective inflation and deflation a rear balloon positioned backward of the linearly extendible and retractable element and adapted for selective inflation and deflation and, a twisting element adapted to twist at least one of the linearly extendible and retractable element, front balloon and rear balloon during inflation and deflation of the advancement balloon.
