US Patent 11963887 Expandable cage adjustment tool and method

An adjustment tool configured to adjust an intervertebral implant comprises a housing, a traveler member, a tether member, and a drive member. The traveler member is coupled to the housing. A proximal end of the tether member is coupled to the traveler, and a distal end of the tether member is configured to couple to the implant. The tether member is substantially linearly fixed to the traveler and rotatable relative to the traveler. The drive member is configured to transition between 1.) a first position in which the drive member is coupled to the tether such that rotation of the drive member causes rotation of the tether relative to the traveler, and 2.) a second position in which the drive member is coupled to the traveler such that rotation of the drive member causes rotation of the traveler relative to the housing.