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Needle disengagement sensing mechanism

  • US 20070004996A1
  • Filed: 06/20/2005
  • Published: 01/04/2007
  • Est. Priority Date: 06/20/2005
  • Status: Abandoned Application
First Claim
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1. A needle disengagement sensing mechanism, comprising:

  • a fistula needle adapted to carry a fluid;

    an electronic sensing system operatively connected to the fistula needle, the electronic sensing system capable of detecting at least partial disengagement of the fistula needle from a position engaged with the fluid, the detecting being a result of at least one of i) a comparative analysis of complex impedance measurements of the needle when in the fluid engaged position and when at least partially out of the fluid engaged position and ii) a comparative analysis of optical spectroscopic measurements taken through an area of the mechanism adapted to carry the fluid, the measurements being taken when the needle is in the fluid engaged position and when the needle is at least partially out of the fluid engaged position; and

    an alarm control conduit operatively connecting the electronic sensing system to at least one of a hemodialysis machine and an electronic device, wherein the alarm control conduit generates an alarm upon detecting at least partial disengagement of the fistula needle.

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