Non-Circular ENT Working Channel for Wire-Safe Tube Rotation

The patent changes the working channel from a circular cross-section to a non-circular cross-section (specifically oval or flattened circular). This asymmetric modification allows the channel to maintain structural integrity for autoclave sterilization while enabling compatibility with disposable plastic sheaths that have corresponding non-circular lumens, thus resolving the contradiction between sterilization capability and adaptability to disposable components.

The non-circular cross-section design enables the working channel to fit within disposable plastic sheaths while the patent provides alternative sterilization methods (chemical sterilization, radiation sterilization, or sterilization in dry heat) that do not require autoclaving, thus resolving the contradiction between adaptability and sterilization capability through multiple solution paths.

The patent employs extrusion molding or injection molding processes with specialized dies to create the non-circular working channel. These manufacturing methods, while requiring custom tooling, are well-established in medical device fabrication and can produce consistent non-circular geometries efficiently, thus managing the manufacturing complexity while achieving disposable sheath compatibility.

The patent adopts non-circular cross-section working channels manufactured through extrusion or injection molding with custom dies. While this requires specialized tooling, it enables the shaft to accommodate flexible disposable plastic sheaths with matching non-circular lumens, thus achieving adaptability to disposable components while maintaining manufacturing feasibility through established molding processes.