Method for identification of sensor site by local skin spectrum data

• US 8,346,327 B2
• Filed: 03/09/2007
• Issued: 01/01/2013
• Est. Priority Date: 03/09/2007
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Campbell, Shannon E., Debreczeny, Martin P., Hoarau, Carine
• Primary Examiner(s): Winakur, Eric
• Assistant Examiner(s): Liu, Chu Chuan (JJ)
• Application Number:
  US11/716,264
• Publication Number:
  US 20080221410A1
• Time in Patent Office: 2,125 Days
• Field of Search: 600/310, 600/323, 600/331, 600/322, 600/324, 600/326, 600/316, 600473-478
• US Class Current: 600/310
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/1495 Calibrating or testing of in-vivo probes
• CPC Class Codes: A61B 5/443 Evaluating skin constituents, e.g. elastin, melanin, water
• CPC Class Codes: G01N 21/474 Details of optical heads therefor, e.g. using optical fibres

Abstract

A method is provided for determining the location of the sensor. The method comprises determining a physiological parameter based on detected light and determining the location of the sensor based on the physiological parameter. In addition, a method is provided for operating a sensor that includes calibrating a sensor based on a patient-specific physiological parameter, in which the patient-specific physiological parameter is skin color, age, gender, pooled blood, venous blood pulsation, or abnormal tissue.

Claims

1. A method for determining a location of a sensor on a patient'"'"'s body, comprising:

emitting light into a patient'"'"'s tissue with at least one emitter disposed on a sensor body;

detecting the light with at least one detector disposed on the sensor body;

determining a physiological parameter based on the detected light;

determining the location of the sensor based on the parameter; and

selecting calibration information based on the location of the sensor.

2. The method of claim 1, wherein determining the physiological parameter comprises determining a water content of the patient'"'"'s tissue.

3. The method of claim 1, wherein determining the physiological parameter comprises determining an epidermal thickness of the patient'"'"'s tissue.

4. The method of claim 1, wherein determining the physiological parameter comprises determining a dermal thickness of the patient'"'"'s tissue.

5. The method of claim 1, wherein determining the location of the sensor comprises determining whether the location of the sensor is the forehead of the patient or the finger of the patient.

6. The method of claim 1, wherein the sensor is a pulse oximetry sensor.

7. The method of claim 1, wherein the sensor is a fiber optic sensor.

8. A method of operating a sensor, comprising:

emitting light into a patient'"'"'s tissue with at least one emitter;

detecting the light with at least one detector;

determining a first patient-specific physiological parameter based on the detected light, wherein the first patient-specific physiological parameter comprises at least one of skin color, age, gender, pooled blood, venous blood pulsation, or abnormal tissue;

determining a second patient-specific physiological parameter based on the detected light, wherein the second patient-specific physiological parameter is different from the first patient-specific physiological parameter; and

selecting calibration information for the determination of the second patient-specific physiological parameter based on the first patient-specific physiological parameter.

9. The method of claim 8, wherein determining the second patient-specific physiological parameter comprises determining blood oxygen saturation from the detected light.

10. The method of claim 8, wherein the abnormal tissue comprises tissue edema.

11. The method of claim 8, comprising providing a notification based on the first or the second patient-specific physiological parameter.

12. The method of claim 8, wherein determining the calibration information comprises determining a calibration coefficient based on the first patient-specific physiological parameter.

13. The method of claim 8, comprising selecting one emitter and one detector based on the first patient-specific physiological parameter, wherein the sensor comprises at least two emitters and at least two detectors.

14. The method of claim 13, wherein selecting one emitter and one detector based on the first patient-specific physiological parameter comprises selecting an emitter and a detector with a spacing suitable for operating in transmission mode or reflectance mode.

15. The method of claim 8, wherein the sensor is a pulse oximetry sensor.

16. The method of claim 8, wherein the sensor is a fiber optic sensor.

17. A sensor assembly, comprising:

a sensor body having an emitter configured to emit light into a patient'"'"'s tissue and a detector configured to detect the light; and

a monitor comprising an algorithm configured to determine the location of the sensor on a patient'"'"'s body based on a physiological parameter from the detected light and an algorithm configured to select calibration information based on the location of the sensor.

18. The assembly of claim 17, wherein the sensor assembly is configured to measure blood oxygen saturation.

19. The assembly of claim 17, wherein the emitter comprises optic fibers.

20. A sensor assembly, comprising:

a sensor body having a plurality of emitters configured to emit light into a patient'"'"'s tissue and a plurality of detectors configured to detect the light; and

a monitor being configured to determine a location of the sensor body on the patient based on a physiological parameter from the detected light and configured to select at least one emitter from the plurality of the emitters and at least one detector from the plurality of the detectors based on the location of the sensor body.

21. The sensor assembly of claim 20, wherein the physiological parameter comprises skin color.

22. The sensor assembly of claim 20, wherein the monitor is configured to select an emitter and a detector with a spacing suitable for operating in transmission mode or reflectance mode based on the location of the sensor body.