Access disconnection systems and methods
First Claim
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1. A method of detecting access disconnection during an extracorporeal blood treatment, the method comprising the steps of:
- coupling an extracorporeal blood system including a plurality of components to a patient via an extracorporeal blood circuit including a first blood line and a second blood line allowing blood to flow into, through and out of the patient along the extracorporeal blood circuit during treatment;
injecting an electrical signal into the blood circuit through a direct conductive connection between a pair of electrodes in direct contact with blood as it flows through the extracorporeal blood circuit to define a loop; and
measuring a change in an electrical value at a third contact point attached to the extracorporeal blood circuit in response to access disconnection.
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Abstract
Apparatuses, devices, systems and methods for detecting access disconnection during medical therapy are provided. The present invention includes an electric circuit coupled to, for example, a blood circuit used during dialysis therapy. The electric circuit can inject an electrical signal into the blood circuit such that changes in an electrical value in response to access disconnection, such as needle drop-out or catheter drop-out, can be effectively detected.
51 Citations
24 Claims
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1. A method of detecting access disconnection during an extracorporeal blood treatment, the method comprising the steps of:
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coupling an extracorporeal blood system including a plurality of components to a patient via an extracorporeal blood circuit including a first blood line and a second blood line allowing blood to flow into, through and out of the patient along the extracorporeal blood circuit during treatment; injecting an electrical signal into the blood circuit through a direct conductive connection between a pair of electrodes in direct contact with blood as it flows through the extracorporeal blood circuit to define a loop; and measuring a change in an electrical value at a third contact point attached to the extracorporeal blood circuit in response to access disconnection. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for detecting dislodgment of an access device from a patient as blood flows through an extracorporeal blood circuit including a first blood line and a second blood line allowing connection of the patient to an extracorporeal blood system including a plurality of components, the apparatus comprising:
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a direct conductive connection between a pair of electrodes in direct contact with blood as it flows through the extracorporeal blood circuit and through which an electrical signal can be injected into the blood circuit to define a loop; and a measuring device coupled to the extracorporeal blood circuit at a third contact point wherein the measuring device can be used to measure a change in an electrical value in response to dislodgment detection. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of detecting access disconnection during an extracorporeal blood treatment, the method comprising the steps of:
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coupling an extracorporeal blood system including a plurality of components to a patient via an extracorporeal blood circuit including a first blood line and a second blood line allowing blood to flow into, through and from the patient along the extracorporeal blood circuit during treatment; injecting an electrical signal into the blood circuit at a first contact point thereby defining a loop; and measuring a change in an electrical value using a direct conductive connection made between a pair of electrodes in direct contact with blood as it flows through the extracorporeal blood circuit. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An apparatus for detecting dislodgment of an access device from a patient as blood flows through an extracorporeal blood circuit which includes a first blood line and a second blood line allowing connection of the patient to an extracorporeal blood system including a plurality of components, the apparatus comprising:
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an electrical signal device coupled to the extracorporeal blood circuit at a first contact point capable of injecting an electrical signal into the blood circuit thereby defining a loop; and a direct conductive connection includes a pair of electrodes in direct contact with blood as it flows through the extracorporeal blood circuit and within the loop along which a change in an electrical value can be measured in response to dislodgment. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification