Blood transfusion apparatus

• US 3,990,444 A
• Filed: 11/25/1974
• Issued: 11/09/1976
• Est. Priority Date: 11/22/1972
• Status: Expired due to Term

• Current Assignee: Vial SARL
• Original Assignee: Vial SARL
• Inventors: Vial, Guy Aime
• Primary Examiner(s): Truluck, Dalton L.
• Application Number:
  US05/526,955
• Time in Patent Office: 715 Days
• Field of Search: 128/214 R, 128/214 C, 128/214 E, 128/214 F, 128/214 Z, 128/DIG. 12, 128/DIG. 13, 222/59, 222/63, 417/43, 417/477
• US Class Current: 604/67
• CPC Class Codes: A61M 1/02 Blood transfusion apparatus blood infusion by syringes A61M5/14
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps
• CPC Class Codes: A61M 5/14232 Roller pumps
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626
• CPC Class Codes: F04B 2205/50 Presence of foreign matter in the fluid
• CPC Class Codes: F04B 43/1284 Means for pushing the backing-plate against the tubular flexible member
• CPC Class Codes: Y10S 128/12 Pressure infusion

Abstract

This invention relates to a device adapted to be attached to a conventional transfusion tube of a blood-transfusion apparatus, said device permitting the drop-by-drop regulation and control of the flow-rate and comprising a mechanical pump comprising a plurality of rollers rotatably mounted around the periphery of a disc rotatably mounted within a casing chamber, said chamber having the same diameter as the envelope defined by said rollers, said casing having an opening therein and comprising a slidable member in said opening adapted to be biased by resilient means against said rollers, thus permitting the interposition between said slidable member and said rollers of transfusion tubes of different diameters. An air-bubble detector is provided which stops the pump if an air bubble is present in the transfusion tube, and the failure of any electrical or mechanical member actuates an optical and acoustic alarm signal.

Claims

1. Device for pumping fluid through a flexible tube at a controlled rate, which device comprises a wheel, a plurality of rollers mounted to rotate freely about equidistant points on said wheel while projecting radially from the periphery of said wheel, a casing in which said wheel is rotatably mounted, an opening in said casing positioned radially of said wheel, a pressure member slidably mounted in said opening and having a surface adjacent the periphery of said wheel, said casing, wheel and surface defining a passage for the reception of said flexible tube which traverses an arc of substantially less than 180°

between said wheel and surface and leads from one side of said casing to its opposite side and through which the fluid within said tube is advanced when rotation of said wheel advances said rollers through said passage, a motor driving said wheel, a dropping chamber through which fluid in said tube flows, and means responsive to the passage of fluid drops through said dropping chamber to control the speed of said motor, said device further comprising in combination;

means resiliently biassing said pressure member toward said wheel, and

a plurality of recesses within said pressure member, which impart elasticity thereto,

said pressure member surface being divided into successive entrance, central and exit portions, each portion being substantially part-circular in section, and those ends of the entrance and exit sections which are remote from said central section begin likewise more remote from the center of curvature of said central section.

2. A device as claimed in claim 1 in which the entrance and exit sections have a common center of curvature and a larger radius of curvature than said central section.

3. A device as claimed in claim 1 in which said entrance and exit sections have the same radius of curvature as said central section, but different centers of curvature.

4. A device as claimed in claim 1 in which the length of said central section is substantially equal to the distance between the centers of successive rollers.

5. A device as claimed in claim 1 in which said slidable member is slidably mounted in a guide member which is pivotally attached to said casing so that it may be swung between a closed position in which said slidable member is urged against a tube in said passage and an open position permitting the introduction of a tube into said passage.