US Patent 11173298 Collapsing coil coupling for lead extension and extraction

A device for extending a lead according to some embodiments includes a body, a coil element coupled to the body, the body configured to cover the coil element during use, the coil element comprising an inner lumen sized to receive an outer surface of a lead, the coil element is movable between a first configuration in which the coil element slides over the lead, and a second configuration in which at least some coils grip the outer surface of the lead; and an actuation mechanism operatively coupled to the coil element, the actuation mechanism configured to move the coil element between the first and second configurations.