Abstract: Systems and methods are disclosed for incorporating patient pressure into medical fluid delivery. An example system includes a medical fluid delivery machine and a medical fluid handling device including a patient line for being placed in fluid communication with a patient. The medical fluid delivery machine includes a control unit, a pump actuator for actuating the medical fluid handling device to move medical fluid into or out of the device, and a pressure sensor configured to sense a pressure of the medical fluid. The control unit is programmed to perform a routine during pumping in which the control unit determines if at least a component of a signal reading from the pressure sensor is indicative of a pressure within the patient, and determines from the component of the signal reading indicative of the pressure in the patient whether to continue pumping or stop pumping.

Abstract: A medical fluid delivery machine includes a pump interface having an actuation area for delivering positive or negative pressure to a medical fluid handling device; a pressure sensor positioned to measure pressure within the actuation area; a valve positioned to selectively vent the actuation area to atmosphere; and a control unit in signal communication with the pressure sensor and control communication with the valve, the control unit performing a sequence during pumping, wherein (i) application of positive pressure or negative pressure to the actuation area is stopped, the valve is switched to vent the actuation area to atmosphere, then switched to close the actuation area to atmosphere, and at least one pressure signal reading is taken via the pressure sensor, and (ii) a determination is made whether positive pressure or negative pressure to the chamber should be resumed based on the at least one pressure signal reading.

Abstract: A medical fluid delivery machine includes a pump interface having an actuation area for delivering positive or negative pressure to a medical fluid handling device; a pressure sensor positioned to measure pressure within the actuation area; a valve positioned to selectively vent the actuation area to atmosphere; and a control unit in signal communication with the pressure sensor and control communication with the valve, the control unit performing a sequence during pumping, wherein (i) application of positive pressure or negative pressure to the actuation area is stopped, the valve is switched to vent the actuation area to atmosphere, then switched to close the actuation area to atmosphere, and at least one pressure signal reading is taken via the pressure sensor, and (ii) a determination is made whether positive pressure or negative pressure to the chamber should be resumed based on the at least one pressure signal reading.