Chatsworth-based Iris International has signed a supply agreement with Novation LLC, which is the health care contracting services company of VHA Inc. and University HealthSystem Consortium. The contract is scheduled to run for one-year, and includes two one-year extensions. Novation serves the purchasing needs of almost 3,000 members through VHA Inc and UHC. Iris will also have access to HealthCare Purchasing Partners International, which serves more than 9,000 health care clients nationwide.