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| Signal processing apparatus |
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| Signal processing apparatus |
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| Device for measuring physiological state |
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Low-noise optical probes
| Details |
Inventors: Diab, Mohamed; Kiani, Massi E.; Tobler, David R.; Gerhardt, Thomas J.; Mason, Eugene M.; Mills, Mike A.;
Assignee: Masimo Corporation (Mission Viejo, CA)
Primary Examiner: Nasser; Robert L.
Assistant Examiner:
Attorney, Agent or Firm: Knobbe, Martens, Olson & Bear LLP
An optical probe, which is particularly suited to reduce noise in measurements taken on an easily compressible material, such as a finger, a toe, a forehead, an earlobe, or a lip, measures characteristics of the material. A neonatal and adult disposable embodiment of the probe include adhesive coated surfaces to securely affix the probe onto the patient. In addition, the surface of the probe is specially constructed to minimize light piping effects. Furthermore, a flex circuit acts as a spring to absorb shock which may misalign the emitter and detector. One embodiment of the adult probe includes a cushioning pocket formed for a fingertip to align the probe and to absorb motion of the probe due to contact. The neonatal probe is formed with a unique V-configuration which provides multiple advantages. |
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DETAILED DESCRIPTION The present invention involves a probe for use in non-invasive energy absorption (or reflection) measurements.
One aspect of the present embodiment involves an optical probe for non-invasive measurement of characteristics of a medium, wherein the prove has an emitter which transmits optical radiation and a detector configured to detect the optical radiation transmitted by the emitter.
The probe also has a flexible circuit assembly having circuit paths for connection with the emitter and the detector.
A substrate forms a surface of the flex circuit assembly between the detector and the emitter.
The substrate is constructed to minimize light piping from the emitter to the detector.
In one embodiment, the probe further has a flexible backing supporting the flex circuit, the flexible backing being configured to attach the optical probe to the medium.
Advantageously, a an optical cavity is provided for the detector.
In one advantageous embodiment, the flexible circuit assembly is sufficiently flexible to provide spring action to minimize optical decoupling between the emitter and the detector due to perturbations of the medium.
Advantageously, a flexible backing supporting the flex circuit is configured to affix the optical probe to the medium.
Also, in one preferred embodiment, the flex circuit has an optical obstruction between the emitter and the detector.
In one preferred embodiment, the optical obstruction comprising an aperture through the flex circuit configured to receive a fingertip when the optical probe is affixed to a finger.
The aperture stabilizes the finger within the probe so as to reduce optical decoupling between the emitter and the detector.
Preferably, the probe has an optical cavity containing the detector.
In one advantageous embodiment, the optical cavity containing the detector is coated with a material which absorbs ambient light or the cavity is made from an ambient light absorptive material.
A further aspect of the present invention involves a probe for the non-invasive measurement of characteristics of a medium
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Communications 
