Patent ID: 8545432

Claim:
A retrograde flow system for treating an artery, comprising: an arterial access device adapted to be introduced into an artery and receive blood flow from the artery; a shunt fluidly connected to the arterial access device, wherein the shunt provides a pathway for blood to flow from the arterial access device to a return site; a flow control assembly coupled to the shunt and adapted to regulate blood flow through the shunt between at least a first blood flow state and at least a second blood flow state, wherein the flow control assembly includes a flow resistance element adapted to adjust a resistance of blood flow through the shunt, and wherein the flow resistance element comprises two or more parallel flow paths of the shunt and a valve to open or close one or more of the flow paths to direct blood flow selectively through one or more of the flow paths, and wherein the parallel flow paths include a main flow path and a secondary flow path that has a higher resistance to blood flow than the main flow path; and a shut-off valve assembly that regulates fluid flow through the shunt, wherein the shut-off valve assembly automatically blocks fluid flow through the shunt in response to injection of a fluid into the arterial access device.