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Access disconnection systems and methods

  • US 7,682,328 B2
  • Filed: 01/16/2006
  • Issued: 03/23/2010
  • Est. Priority Date: 04/10/2002
  • Status: Active Grant
First Claim
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1. An extracorporeal blood system comprising:

  • an extracorporeal blood machine;

    an extracorporeal blood circuit coupled operably to the machine, the extracorporeal blood circuit including first and second blood lines, the blood lines configured to be in blood flow communication with a patient;

    an electrical loop including first and second electrodes placed in contact with blood flowing through the first and second blood lines, respectively;

    a device configured to inject an electrical signal into the blood circuit via the loop;

    a third electrode placed in contact with blood flowing through the extracorporeal blood circuit, the third electrode configured to enable a change in an electrical value to be measured so that an access disconnection of the extracorporeal blood circuit from the patient can be measured; and

    a conductive path between the first and second contacts, forming part of the electrical loop, the conductive path not directly connected to a signal source or a measuring device for providing and measuring the electrical value, respectively.

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