Multifinger photocell plethysmography system
First Claim
1. A multifinger blood flow measuring and recording instrument comprising a support, a plurality of open-ended finger-receiving housings mounted on said support and arranged to simultaneously individually receive all the fingers of a patient'"'"'s hand, an electrical photodetector mounted in each housing, light pipe means connected to each housing opposite each photodetector and spaced therefrom to permit a finger to be inserted therebetween, a common light source optically coupled to the respective light pipe means, multichannel signal recording means, and circuit means connecting the photodetectors to the inputs of said multichannel recording means for simultaneously recording in respective channels the transmission of light from said source through a plurality of the patient'"'"'s fingers.
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Accused Products
Abstract
A photoplethysmographic instrument for simultaneous recordings of multifinger blood flow. The instrument consists of a plurality of suitably spaced and angled finger-receiving housings, each containing a photodetector, with respective light pipe bundles conducting light from a common source to the housings. The photodetectors respond to differences in light transmission through the patient'"'"'s fingers inserted in the housings. The photodetectors are connected through respective preamplifiers to the respective inputs of a multichannel recorder, thereby providing recorded traces of the respective optical transmissions through the fingers. The photodetectors may also be connected to the respective inputs of a multichannel tape recorder, thereby providing magnetic tape recordings of the respective optical transmissions.
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Citations
15 Claims
- 1. A multifinger blood flow measuring and recording instrument comprising a support, a plurality of open-ended finger-receiving housings mounted on said support and arranged to simultaneously individually receive all the fingers of a patient'"'"'s hand, an electrical photodetector mounted in each housing, light pipe means connected to each housing opposite each photodetector and spaced therefrom to permit a finger to be inserted therebetween, a common light source optically coupled to the respective light pipe means, multichannel signal recording means, and circuit means connecting the photodetectors to the inputs of said multichannel recording means for simultaneously recording in respective channels the transmission of light from said source through a plurality of the patient'"'"'s fingers.
Specification