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Adapter cable for connecting a pulsoximetry sensor unit to a medical measuring device

  • US 5,287,853 A
  • Filed: 12/11/1992
  • Issued: 02/22/1994
  • Est. Priority Date: 12/11/1992
  • Status: Expired due to Term
First Claim
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1. An adapter cable for connecting a pulsoximetry sensor unit to a medical measuring device,said pulsoximetry sensor unit comprising two antiparallel-connected, light-emitting elements for emitting light of different wavelengths into a part of the body supplied with pulsating blood and a photosensitive element for receiving light which has been allowed to pass through said part of the body supplied with pulsating blood, andsaid medical measuring device providing a pulsed supply signal, which supplies power to the light-emitting elements, and determining, on the basis of a signal produced by said photosensitive element, the oxygen saturation of the hemoglobin contained in the blood of the transilluminated part of the body,wherein said adapter cable comprises the following features;

  • first and second lines for connecting the antiparallel-connected, light-emitting elements with supply terminals of the medical measuring device;

    a third line for connecting one terminal of the photosensitive element to a measuring signal input of the medical measuring device;

    a first grounding line for connecting another terminal of the photosensitive element to a reference potential terminal of the measuring device;

    an electronic switch means, which is connected to said first and second lines and which, when activated, forms a shunt to at least one of the light-emitting elements, anda fault current detection circuit, which detects current flowing through the first grounding line and for activating the electronic switch means, if the current flowing through said first grounding line exceeds a limit value.

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