SYSTEMS AND METHODS FOR EXTENDING THE USEFUL LIFE OF OPTICAL SENSORS

• US 20090146078A1
• Filed: 05/19/2008
• Published: 06/11/2009
• Est. Priority Date: 04/26/2004
• Status: Active Grant

• Current Assignee: Senseonics, Incorporated (Senseonics Holdings, Inc.)
• Original Assignee: Sensors For Medicine and Science Incorporated
• Inventors: Colvin, Arthur Earl JR., Lorenz, Carrie R., Lesho, Jeffery C.
• Granted Patent: US 8,502,167 B2
• Time in Patent Office: Days
• US Class Current: 250/459.100
• CPC Class Codes: A61B 2560/0209 adapted for power saving
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/14556 by fluorescence A61B5/14555 takes precedence
• CPC Class Codes: A61B 5/1459 invasive, e.g. introduced into the body by a catheter A61B5/1464 takes precedence
• CPC Class Codes: G01N 21/6428 Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" in vivo A61B5/00; immunoassay G01N33/53

Abstract

The present invention provides a method for increasing the lifetime of an optical sensor. In one aspect, the method includes the step of configuring the optical sensor so that the duty cycle of sensor'"'"'s radiant source is less than 100% over a continuous period amount of time when the sensor is periodically obtaining data regarding an analyte. By operating the sensor according to the above inventive method, the indicator molecules of the optical sensor are not excited during the entire continuous period of time during which the sensor is needed to provide data regarding the presence or concentration of a substance. Thus, the method increases the life of the indicator molecules.

Claims

1. A method for increasing the lifetime of an optical sensor that, when active, is configured to obtain data regarding the presence or concentration of a substance within an area, wherein the optical sensor includes (i) indicator molecules having an optical characteristic that is affected by the presence of the substance and (ii) a radiant source, the method comprising:

(a) utilizing the optical sensor configured so that the duty cycle of the radiant source is greater than 0% but less than 100% during the period of time when the optical sensor is active;

(b) positioning the optical sensor at a location within the area;

(c) activating the optical sensor for a period of Z amount of time after performing step (b), wherein Z is greater than 0;

(d) operating the radiant source so that the duty cycle of the radiant source is greater than 0% but less than 100% during said Z amount of time when the optical sensor is active; and

(e) de-activating the optical sensor after said Z amount of time has elapsed.

2. A method for increasing the useful lifetime of an optical sensor that, when in an active state, obtains data regarding the presence or concentration of a substance within an area at least once every X amount of time for a continuous Z amount of time, wherein the optical sensor includes indicator molecules having an optical characteristic that is affected by the presence of the substance and a light source for exciting the indicator molecules, the method comprising:

placing the optical sensor at a location within the area;

activating the optical sensor at the beginning of the Z amount of time;

exciting the indicator molecules for a total of not more than Y amount of time during each X amount of time, wherein Y is less than X; and

deactivating optical sensor at the end of the Z amount of time.