ISG was founded in 1975 as Suburban Ostomy; today it is a subsidiary of Invacare. Invacare Supply Group (ISG) makes sure that Invacare's distribution wheels are always greased. ISG, a subsidiary of medical equipment maker Invacare Corporation, is a national wholesale distributor of thousands of medical equipment and supply items, including Invacare-brand wheelchairs and products for orthopedics, diabetes, wound care, ostomy, and urological ailments. Through six regional distribution centers in the US, ISG serves customers including managed care companies, pharmacies, home medical equipment providers, and national home-care chain operators.