Patent ID: 7967783

Claim:
A continuous pump relay system comprising: at least first and second drivers having forward and reverse directions, wherein the drivers are configured to discharge fluid from at least first and second medication containers, respectively, when operating in the forward direction; a fluid communication device including at least first and second fluid inputs configured to receive fluid from the first and second medication containers, and a fluid output having a reflux barrier configured to allow fluid in the fluid communication device to flow through the reflux barrier; at least one pressure sensing device configured to generate sensor signals representative of fluid pressure at one or more locations within the fluid communication device; and a controller coupled to the first and second drivers and the pressure sensing device, the controller configured to operate the first and second drivers based at least on the sensor signals so as to changeover the system from delivering fluid from the first medication container at a reference pressure to delivering fluid from the second medication container by operating the first driver in the reverse direction to decrease the fluid pressure and then stopping the first driver, and then operating the second driver in the forward direction at a first rate until the fluid pressure reaches a predetermined fraction of the reference pressure and then at a second rate, less than the first rate, until the fluid pressure reaches the reference pressure without creating a bolus.