Device for generating a detectable signal based upon concentration of at least one substance
Utilization of a contact device placed on the eye in order to detect physical and chemical parameters of the body as well as the non-invasive delivery of compounds according to these physical and chemical parameters, with signals being transmitted continuously as electromagnetic waves, radio waves, infrared and the like. One of the parameters to be detected includes non-invasive blood analysis utilizing chemical changes and chemical products that are found in the conjunctiva and in the tear film. A transensor mounted in the contact device laying on the cornea or the surface of the eye is capable of evaluating and measuring physical and chemical parameters in the eye including non-invasive blood analysis. The system utilizes eye lid motion and/or closure of the eye lid to activate a microminiature radio frequency sensitive transensor mounted in the contact device. The signal can be communicated by wires or radio telemetered to an externally placed receiver. The signal can then be processed, analyzed and stored. Several parameters can be detected including a complete non-invasive analysis of blood components, measurement of systemic and ocular blood flow, measurement of heart rate and respiratory rate, tracking operations, detection of ovulation, detection of radiation and drug effects, diagnosis of ocular and systemic disorders and the like.
1. An apparatus for noninvasive measurement of a concentration of at least one substance in the eye, said application comprising:
a mid-infrared radiation detecting device configured to detect mid-infrared radiation intensity of two wavelengths of light in a mid-infrared region naturally emitted by said eye, said mid-infrared radiation intensity from said eye containing a radiation signature of said at least one substance, said mid-infrared radiation detecting device detecting mid-infrared radiation intensity of the two wavelengths with one of said wavelengths having a high absorption correlation with the substance being measured and the other of said wavelengths having a lower absorption correlation with the substance being measured and providing an output signal based upon a ratio of the two intensities, and
a processing device including a memory storing a plurality of pre-determined reference values and a processing circuit for receiving said output signal representative of said ratio of the two intensities output from said eye,
comparing said output signal representative of said ratio of the two intensities from said eye with said plurality of reference values, and
determining the concentration of the at least one substance based on said comparison,
a display for reporting the concentration of said at least one substance from the eye.
2. A method for noninvasive measurement of at least one substance in the eye, said method comprising the steps of:
detecting radiation intensity of two wavelengths in the mid-infrared region of radiation naturally emitted by said eye, one of said wavelengths having a high absorption correlation with the substance being measured and the other of said wavelengths having a lower absorption correlation with the substance being measured,
comparing a ratio of said two intensities against a plurality of pre-determined reference values for a radiation signature of the at least one substance in said eye, and
determining a concentration of the at least one substance in the eye based on said comparison result.