An investigational device that:(1)It is intended as an implant and presents a potential for serious risk to the health, safety, or welfare of a subject.(2)It is purported or represented to be for a use in supporting or sustaining human life and presents a potential for serious risk to the health, safety, or welfare of a subject.(3)It is for a use of substantial importance in diagnosing, curing, mitigating, or treating disease, or otherwise preventing impairment of human health and presents a potential for serious risk to the health, safety, or welfare of a subject.(4)Otherwise presents a potential for serious risk to the health, safety, or welfare of a subject.