Disclosed herein is a portable endoscope and kit for performing multiple medical procedures. The portable endoscope comprises a detachable operator control section assembly and one of multiple detachable and interchangeable flexible insertion shaft assemblies with a flexible distal end. The proximal end of a detachable and interchangeable flexible insertion shaft assembly is detachably connected to the detachable operator control section assembly. The detachable and interchangeable flexible insertion shaft assembly accommodates principal cable wires, proxy cable wires, an optical imaging system, and an illumination system. An internal cable wire control system integrated with the detachable operator control section assembly utilizes an adaptable drive transmission system for controlling the orientation and angular position of the flexible distal end using the principal cable wires or the proxy cable wires. The proxy cable wires may be engaged in an event of failure of the principal cable wires.