Blood pumping system with selective backflow warning

• US 5,368,554 A
• Filed: 11/20/1992
• Issued: 11/29/1994
• Est. Priority Date: 11/20/1992
• Status: Expired due to Fees

• Current Assignee: Terumo Cardiovascular Systems Corporation (Terumo Corporation), ViaSat Incorporated
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company), ViaSat Incorporated
• Inventors: Schneider, Daniel E., Agnew, Marc H., Mead, Wilfred A., Nazarian, Richard A.
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): CLARKE, ROBERT A
• Application Number:
  US07/979,181
• Time in Patent Office: 739 Days
• Field of Search: 604/4-6, 604/31, 604/50, 604/65, 604/67, 604/118, 604/121, 623/3, 128/696, 128/DIG. 13, 600/17, 340/572, 364/413.01, 364/413.02, 364/574, 364/803
• US Class Current: 604/6.11
• CPC Class Codes: A61M 1/1698 Blood oxygenators with or without heat-exchangers intracorporal A61M1/1678; manufacturing of membranes therefor B01D67/00; semi-permeable membranes for separation processes characterised by their properties B01D69/00; semi-permeable membranes characterised by their material B01D71/00
• CPC Class Codes: A61M 1/3621 Extra-corporeal blood circuits single-needle circuits A61M1/30
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 60/113 in other functional devices, e.g. dialysers or heart-lung machines
• CPC Class Codes: A61M 60/232 Centrifugal pumps
• CPC Class Codes: A61M 60/38 Blood oxygenation
• CPC Class Codes: A61M 60/523 using blood flow data, e.g. from blood flow transducers
• CPC Class Codes: A61M 60/538 Regulation using real-time blood pump operational parameter data, e.g. motor current
• CPC Class Codes: A61M 60/585 User interfaces
• CPC Class Codes: Y10S 128/13 Infusion monitoring

Abstract

A blood pumping system and method in which a selective backflow warning is generated in response to the detection of a backflow condition only in the absence of electrical interference that could cause the generation of a false backflow warning. Detection of a backflow condition is performed by activating the transmitter and receiver of a flow detector to determine the direction of blood flow and detection of the electrical interference is performed by activating the receiver of the flow detector while the transmitter is not activated. If electrical interference that could cause the generation of a false backflow warning exceeds a threshold, the system does not generate a backflow warning.

Claims