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Systems and method for assessing functionality of dual check valve arrangements in medical tubing sets

  • US 9,265,885 B2
  • Filed: 09/28/2010
  • Issued: 02/23/2016
  • Est. Priority Date: 09/29/2009
  • Status: Active Grant
First Claim
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1. A medical fluid tubing set, comprising:

  • a multi-patient tubing section that is reusable for injection of multiple patients;

    a patient-specific tubing section downstream of and detachably connected to said multi-patient tubing section, wherein said patient-specific tubing section is located between said multi-patient tubing section and a patient when delivering fluid to the patient, and wherein said patient-specific tubing section comprises;

    first and second check valves that are spaced along said patient-specific tubing section;

    a pressure sensor fluidly connected with a first region of said patient-specific tubing section that extends between said first and second check valves, wherein said pressure sensor is responsive to a fluid pressure in said first region of said patient-specific tubing section and comprises means for monitoring for a failed condition, wherein said failed condition is a presumption that at least one of said first and second check valves has failed by remaining open when said at least one of said first and second check valves should be closed, wherein said pressure sensor comprises a movable element that undergoes a change in position when said fluid pressure within said first region falls below a predetermined fluid pressure level to identify said failed condition, wherein said predetermined fluid pressure level is a cracking pressure of at least one of said first and second check valves and where a check valve cracking pressure is a minimum amount by which an upstream pressure of the check valve must be greater than a downstream pressure of the check valve before the check valve will open when functioning properly, wherein said change in position of said movable element is visually perceptible from an exterior of said pressure sensor, wherein a first position of said movable element is associated with a presumed proper functioning of said first and second check valves, and wherein a second position of said movable element is associated with said failed condition; and

    a biasing member that is interconnected with said movable element, wherein said biasing member biases said movable element toward said second position, and wherein a biasing force applied to said movable element is less than said predetermined fluid pressure level.

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