×

Volumetric metering unit for intravenous fluid addition

  • US 4,559,044 A
  • Filed: 08/03/1982
  • Issued: 12/17/1985
  • Est. Priority Date: 08/03/1982
  • Status: Expired due to Fees
First Claim
Patent Images

1. A cassette for metering a fluid therethrough, comprising:

  • first and second integrally molded halves secured in facing relation, each of said halves being constructed to form;

    a reservoir portion;

    at least one inlet channel and at least one outlet channel each extending from the reservoir portion; and

    inlet and outlet port sections;

    the inlet channel and inlet port section of each being interconnected by an inlet orifice and the outlet channel and the outlet port section of each being interconnected by an outlet orifice, the reservoir portions of each half forming a reservoir and said port sections of each half forming a single entry port and a single exit port;

    a flexible diaphragm means positioned between said first and second halves for dividing the reservoir into first and second compartments;

    first entry valve means and first exit valve means associated with said first half, said first entry and exit valve means being movable between an open position permitting fluid flow through the inlet and outlet orifices of said first half, respectively, and a closed position to prevent flow through the inlet and outlet orifices, respectively;

    second entry valve means and second exit valve means associated with said second half, said second entry and exit valve means being movable between an open position permitting fluid flow through the inlet and outlet orifices of said second half, respectively, and a closed position to prevent fluid flow through the inlet and outlet orifices, respectively;

    fluid entering said entry port flowing through the inlet orifice and inlet channel of said first half into the first compartment when said first entry valve means and said second exit valve means are open and said first exit valve means and second entry valve means are closed, to move said diaphragm means to force the fluid in the second compartment through the outlet channel and outlet orifice of said second half to the exit port; and

    fluid entering said entry port flowing through the inlet orifice and inlet channel of said second half into the second compartment when said second entry valve means and said first exit valve means are open and said first entry valve means and second exit valve means are closed, to move said diaphragm means to force the fluid in the first compartment through the outlet channel and outlet orifice of said first half to the exit port, the fluid displaced from each of the first and second compartments having a predetermined volume.

View all claims
  • 8 Assignments
Timeline View
Assignment View
    ×
    ×