Volumetric pump for parenteral perfusion

• US 4,955,860 A
• Filed: 04/11/1988
• Issued: 09/11/1990
• Est. Priority Date: 04/09/1987
• Status: Expired due to Fees

• Current Assignee: Miguel M. Ruano
• Original Assignee: Miguel M. Ruano
• Inventors: Ruano, Miguel M.
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): Lewis, Ralph
• Application Number:
  US07/180,067
• Time in Patent Office: 883 Days
• Field of Search: 604/65, 604/67, 604/140, 604/141, 604/143, 604/147, 604/151, 604/153, 128/DIG. 12, 128/DIG. 13
• US Class Current: 604/67
• CPC Class Codes: A61M 5/1483 using flexible bags externally pressurised by fluid pressure
• CPC Class Codes: A61M 5/1486 the bags being substantially completely surrounded by fluid
• CPC Class Codes: Y10S 128/12 Pressure infusion

Abstract

Volumetric pump for use in the parenteral perfusion of solutions without the need for the substitution or inclusion of additional elements in traditionally used dropper systems. The pump consists of a rigid chamber (1) containing a bag (2) with the solution to be perfused and is set up in a common volume formed by a liquid or gaseous interface with another chamber (3) to which it is connected, acting as a pump or pumping agent, and equipped with a distendable membrane (4), which acts on the walls of the bag (2), extracting the residual air by means of suction through the duct (8) which has a valve (5). The solution then passes through a connection tube (6) and is perfused. There is a stopcock (7) in the passage connecting the compartments (1) and (3), and the system is equipped with timers (9) which enable the selected flow to be determined and a servomechanism (10) to ensure greater precision.

Claims

1. Apparatus for parenteral perfusion of a liquid to a patient from a perfusion bag having an outlet tube, said apparatus comprising a rigid housing defining an interior chamber for receiving a perfusion bag in a gas-tight manner, a perfusion bag within said chamber so that said chamber defines an enclosed space surrounding said bag, said bag having an outlet tube extending from said chamber, suction means for evacuating said space, a volumetric fluid pump, connection means between said pump and said housing for filling said space with pressurized fluid received from said pump for applying pressure on said bag to produce perfusion of liquid in said bag through said tube, means for controlling the rate of fluid flow from said pump into said space to control the perfusion rate, and sensor means for sensing the amount of liquid administered to the patient through the outlet tube and operatively connected to said means for controlling the rate of fluid flow from said pump into said space.

2. Apparatus as claimed in claim 1 wherein said housing includes a membrane within said chamber and surrounding said bag, said membrane defining an inner wall in said space.

3. Apparatus as claimed in claim 1 wherein said housing comprises two halves which can be opened like a book for insertion of said bag in said space between said two halves.