Contact Us - Karman Healthcare Karman Wheelchair offers the largest selection as a OEM Brand and trusted leader in lightweight and ultra lightweight wheelchairs since 1994. Karman is the nation’s leading manufacturer of wheelchairs Karman Healthcare has been a leading innovator in the manufacturing and distribution of home medical products since 1994. Karman provides a full line of power and manual wheelchairs, walkers, rollators, & scooters, oxygen regulators, bathroom safety and other home care products.