StairMaster Wheelchair - I worked on a manual stair-climbing wheelchair years ago and was advised that wheelchair users preferred a powered one. The picture below is a demonstrator that I built to
manual stair climbing wheelchair aluminum self-propelled wheelchair with adjustable footplate height for disabled - AliExpress
Vardaan: Stair climbing manual wheelchair - The Index Project
Stair Climbers for Wheelchairs | 101 Mobility
Fabio Electric Stair Climbing Wheelchair Factory Supply Powered Transport up and down Stairs Easy-folding Wheelchair - Newegg.com
Electric-powered wheelchair with stair-climbing ability - Weijun Tao, Junyi Xu, Tao Liu, 2017