A technological community framework can be used to explain and manage new medical technologies. It describes emergence, commercialization, and standardization of an innovation or technology within the context of its whole network (or community) of stakeholders. This framework is used to illustrate the emergence, commercialization, and standardization of a relatively new medical technology--umbilical cord blood (UCB) banking. Umbilical cord blood may prove to be a source of stem cells for bone marrow transplant that is safer, more accessible, and less expensive than current sources of stem cells. The technological community framework can signal potential problems as the technology emerges, and help healthcare delivery systems and providers to effectively assess and manage the technology. The framework can also be applied to other medical technologies and innovations.