Measurement of finger temperature in near-infrared quantitative measurement instrument

• US 5,362,966 A
• Filed: 08/10/1993
• Issued: 11/08/1994
• Est. Priority Date: 06/27/1990
• Status: Expired due to Term

• Current Assignee: Futrex, Inc.
• Original Assignee: Futrex, Inc.
• Inventors: Quintana, Reynaldo J., Rosenthal, Robert D., Paynter, Lynn N.
• Primary Examiner(s): Dzierzynski, Paul M.
• Assistant Examiner(s): HANIG, RICHARD E
• Application Number:
  US08/103,758
• Time in Patent Office: 455 Days
• Field of Search: 250/339, 250/340, 250/341, 128/633, 128/664
• US Class Current: 250/341.1
• CPC Class Codes: A61B 2560/0252 using ambient temperature
• CPC Class Codes: A61B 5/02422 within occluders
• CPC Class Codes: A61B 5/02433 for infrared radiation
• 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 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: G01N 21/359 using near infrared light

Abstract

A near-infrared quantitative analysis instrument for measuring blood analytes in a finger of a subject includes a temperature-sensing thermistor-type ring worn around the base of the finger and connected to the instrument via a cable. A light shield glove may be provided with the thermistor-type ring attached thereto.

Claims

1. A near-infrared quantitative analysis instrument for noninvasive measurement of blood present in a body part of a subject, comprising:

introducing means including a near-infrared energy source for introducing near-infrared energy into blood present in a body part of a subject;

detecting means for detecting near-infrared energy being emitted from said body part and producing signals in response thereto;

positioning means for positioning said body part closely adjacent to both said introducing means and said detecting means;

housing means for housing said introducing means, said detecting means and said positioning means;

temperature sensing means for measuring the temperature of said body part at a location on said body part external to said housing means; and

processing means responsive to the signals produced by said detecting means and the temperature measured by said temperature sensing means for generating a signal indicative of a quantity of a certain analyte in the blood present in said body part.

2. A near-infrared quantitative analysis instrument as set forth in claim 1, wherein said temperature sensing means comprises a flexible thermistor ring attachable to said body part and a cable connectable to said instrument for transmitting a measured temperature to said processing means.

3. A near-infrared quantitative analysis instrument as set forth in claim 2, wherein said body part is a finger.

4. A near-infrared quantitative analysis instrument as set forth in claim 3, wherein said flexible thermistor ring is attachable to a base portion of said finger, and said introducing means introduces near-infrared energy into a tip portion of said finger.

5. A near-infrared quantitative analysis instrument as set forth in claim 1, wherein said body part is a finger, said temperature sensing means comprises a flexible thermistor ring attachable to said finger and a cable connectable to said instrument for transmitting a measured temperature to said processing means, and further comprising a light shielding glove to be worn by said subject to block ambient external light from interfering with said measurement, wherein said flexible thermistor ring is mounted as part of said glove.

6. A near-infrared quantitative analysis instrument as set forth in claim 1, wherein said near-infrared energy is in the range of 600-1100 nm.

7. A flexible thermistor ring attachable to a finger of a subject for measuring the temperature of said finger and including means for outputting the measured temperature, for use with a near-infrared quantitative analysis instrument for noninvasive measurement of an analyte in blood present in said finger.

8. A method of near-infrared quantitative analysis for noninvasive measurement of blood present in a body part of a subject, comprising the steps of:

inserting said body part into a near-infrared quantitative analysis instrument;

introducing near-infrared energy into blood present in said body part of said subject;

detecting near-infrared energy being emitted from said body part and producing signals in response thereto;

measuring the temperature of said body part at a location on said body part external to said instrument; and

generating a signal indicative of a quantity of a certain analyte in the blood present in said body part in response to the signals produced by said detecting step and the temperature measured by said temperature measuring step.

9. A method of near-infrared quantitative analysis as set forth in claim 8, wherein said body part is a finger, and said step of measuring the temperature of said body part comprises the steps of attaching a flexible thermistor ring to said finger, connecting said thermistor ring to said near-infrared quantitative analysis instrument, and transmitting said measured temperature to said instrument.

10. A method of near-infrared quantitative analysis as set forth in claim 9, wherein said flexible thermistor ring is mounted as part of a light shield glove worn by said subject to block ambient external light from interfering with said measurement.

11. A method of near-infrared quantitative analysis as set forth in claim 9, wherein the step of attaching comprises attaching said flexible thermistor ring to a base portion of said finger, and said step of detecting comprises detecting near-infrared energy being emitted from a tip portion of said finger.