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Multiple lens oxygen sensor for medical electrical lead

  • US 6,198,952 B1
  • Filed: 10/30/1998
  • Issued: 03/06/2001
  • Est. Priority Date: 10/30/1998
  • Status: Expired due to Term
First Claim
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1. A body implantable medical electrical lead adapted to be implanted in a living body in operative relation with oxygenated body fluid, comprising:

  • (a) a lead body having proximal and distal ends and comprising an electrically insulative material;

    (b) at least first and second electrical conductors disposed within at least portions of the lead body, the conductors having at least portions of the electrically insulative material disposed therebetween;

    (c) an oxygen sensor attached to the lead body and coupled electrically with said first and second lead conductors, comprising;

    (i) an elongated light blocking housing having proximal and distal ends, an exterior, and first and second interior portions disposed therewithin;

    (ii) a light emitter disposed within the first interior portion of the elongated housing;

    (iii) a light detector disposed within the second interior portion of the elongated housing;

    (iv) a light transmissive first lens disposed over the light emitter and mounted in the elongated housing between the exterior and the first interior portion of the elongated housing to enable at least portions of light emitted by the light emitter to pass through the first lens from the first interior portion to the exterior; and

    (v) a light transmissive second lens disposed over the light detector and mounted in the elongated housing between the exterior and the second interior portion of the elongated housing to enable at least portions of light emitted by the light emitter through the first lens and reflecting from blood adjacent to at least portions of the housing exterior to pass through the second lens from the exterior to the second interior portion, the first and second lenses being separated and spaced apart from one another such that light emitted through the first lens is not transmitted directly into the second lens.

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