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Medicament application adapter comprising a gas blocking element for a hemodialysis tube set

  • US 9,744,296 B2
  • Filed: 11/03/2010
  • Issued: 08/29/2017
  • Est. Priority Date: 11/04/2009
  • Status: Active Grant
First Claim
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1. A medical device for introduction of a liquid medicament stored in an injection vial into an extracorporeal blood circuit of a haemodialysis machine during operation thereof, said device comprising:

  • a gas reservoir for storing a gas, wherein pressure in said gas reservoir is selectable to regulate liquid medicament flow rate into the extracorporeal blood circuit and a period of time over which the liquid medicament in the injection vial is administered into the extracorporeal blood circuit, and wherein a pressure in said gas reservoir is greater than a pressure in conduit pathways of the extracorporeal blood circuit at an addition site;

    a piercing structure for opening the injection vial, said piercing structure having a first conduit pathway and a second conduit pathway,a first end of said first conduit pathway opening into an interior of the injection vial when said piercing structure has been inserted to penetrate fully into the interior of the injection vial,a second end of said first conduit pathway being joined to the conduit pathways of the extracorporeal blood circuit of the haemodialysis machine at the addition site,a first end of said second conduit pathway opening into the interior of the injection vial when said piercing structure has been inserted to penetrate fully into the interior of the injection vial,a second end of said second conduit pathway being connected with said gas reservoir so that gas held in said gas reservoir is able to flow into the interior of the injection vial via the second conduit pathway,a gas-blocking filter element being arranged in said first conduit pathway, said gas-blocking filter element configured to block passage of gases therethrough while allowing the liquid medicament from said injection vial to pass through the gas-blocking filter element and into the extracorporeal blood circuit of the haemodialysis machine at the addition site via said first conduit pathway, said gas-blocking filter element having a filter area and pore size dimensioned to create a desired flow resistance that, in cooperation with a selected pressure in said gas reservoir, is effective to regulate the liquid medicament flow rate from the injection vial to the extracorporeal blood circuit by increasing or decreasing the liquid medicament flow rate through said gas-blocking element so as to administer a greater or lesser quantity, respectively, of the liquid medicament to the extracorporeal blood circuit per unit of time during operation of the haemodialysis machine;

    a venous drip chamber;

    a first pressure measuring device that determines a pressure of the gas in said venous drip chamber; and

    a second pressure measuring device that determines a pressure of the gas in thesaid gas reservoir,wherein the pressure in said gas reservoir is selected based on a pressure difference determined by a comparison the pressure of the gas in said venous drip chamber with the pressure of the gas in said gas reservoir, and wherein the selected pressure is that which is required to regulate the liquid medicament flow rate into the extracorporeal blood circuit without the pressure difference exceeding a bubble pressure of said gas-blocking filter element.

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