Patent DE-3377404-D1 (DE)
Title: Dual phase blood/flow system and method of operation
Inventor: TROUTNER VERNON H
IPC: A61M1/14
Filed: 1983-09-22
Granted: 1988-08-25
Abstract: System includes the arterial blood pump, the venous blood pump, a monitor for detecting the attainment of a given blood capacity, and the controller for activating the venous blood pump upon detection of the given blood capacity and for activating the arterial blood pump after the venous blood pump has been activated for a given no. of operating cycles.Phase alteration is accomplished through pressure monitoring and blood pump cycle control. Only a single pressure control is required for the arterial phase which assures that undesirably high blood pressures will not be produced in the system. There is no need to adjust pressures to produce the proper number of pump turns per phase.  (0/3) EPAB- EP-104895 B A blood processing system for a patient comprising: means (10) for withdrawing blood from a patient; an arterial blood pump (20) having an input coupled to said withdrawing means (10) and an output at which a flow of blood is provided when said pump (20) is activated, means (40) for processing blood having an input coupled to the output of said arterial blood pump (20) and an output at which a flow of processed blood is produced; a blood accumulator (70) having an inlet coupled to said output of said blood processing means (40) and an outlet; a venous blood pump (80) having an input coupled to the output of said blood accumulator (70) and an output; means (10), coupled to the output of said venous blood pump (80), for returning processed blood to said patient; a monitor (56) coupled to said blood processing system; and blood pump control means (100) coupled to said pumps (20,80) and said monitor (56), wherein said blood processing system has a given blood capacity when full, said monitor (56) is adapted to detect the attainment of said given capacity, and said control means (100) is adapted to activate said venous pump (80) upon detection of said given blood capacity and to activate said arterial blood pump (20) after said venous blood pump (80) has been activated, characterised in that: said blood accumulator is a flexible bag (70); said monitor (70) is adapted to detect said given blood capcity when the outlet pressure of said blood processing means (40) is approximately 2.7 KPa (20 mm Hg); and said control means (100) is adapted to activate said arterial blood pump (20) for a given number of operating cycles.(11pp) EP-104895 B A blood processing system for a patient comprising: means (10) for withdrawing blood from a patient; an arterial blood pump (20) having an input coupled to said withdrawing means (10) and an output at which a flow of blood is provided when said pump (20) is activated, means (40) for processing blood having an input coupled to the output of said arterial blood pump (20) and an output at which a flow of processed blood is produced; a blood accumulator (70) having an inlet coupled to said output of said blood processing means (40) and an outlet; a venous blood pump (80) having an input coupled to the output of said blood accumulator (70) and an output; means (10), coupled to the output of said venous blood pump (80), for returning processed blood to said patient; a monitor (56) coupled to said blood processing system; and blood pump control means (100) coupled to said pumps (20,80) and said monitor (56), wherein said blood processing system has a given blood capacity when full, said monitor (56) is adapted to detect the attainment of said given capacity, and said control means (100) is adapted to activate said venous pump (80) upon detection of said given blood capacity and to activate said arterial blood pump (20) after said venous blood pump (80) has been activated, characterised in that: said blood accumulator is a flexible bag (70); said monitor (70) is adapted to detect said given blood capcity when the outlet pressure of said blood processing means (40) is approximately 2.7 KPa (20 mm Hg); and said control means (100) is adapted to activate said arterial blood pump (20) for a given number of operating cycles. (11pp) USAB- US4490134 A A patient blood processing system comprises an arterial blood withdrawal pump (20) supplying blood to a processing unit (40) with a flexible blood accumulator (70) connected to its output and itself connected by a venous blood pump (80) to the patient. When full the system has a blood capacity corresp. to a dialyser outlet pressure of about 20 mm Hg.A monitor is associated with the accumulator to detect when it reaches its full level, and a controller (100) coupled to the pumps activates the venous pump when the full level is reached, and activates the arterial pump after the venous pump has operated for a given number of cycles. The monitor is pref. a pressure transducer coupled between dialyser and venous pump, the controller is a microprocessor and the operating cycle detector includes a slot encoder