Table 2: Specialised Sheaths: Types and Uses.

Type of Specialised Sheath	Useful For	Less Useful For
Non-powered telescoping sheaths[56,57]	Fibrous adhesions	Dense fibrotic or heavily calcified lesions
Laser sheaths[58, 59]	Fibrous lesions and scar tissue	Heavily calcified lesions
Rotational mechanical cutters[60–63]	Dense calcified fibrotic lesions	Scar tissue