Sensor for determining body parameters

• US 20080297764A1
• Filed: 11/13/2007
• Published: 12/04/2008
• Est. Priority Date: 11/13/2006
• Status: Abandoned Application

• Current Assignee: Weinmann Gerate Fur Medizin GmbH & Co. KG
• Original Assignee: Weinmann Geraete Fur Medizin GmbH + Company KG
• Inventors: Scholler, Bernhard, Magin, Thomas, Schmidt, Carola, Bernstein, Mike
• Application Number:
  US11/985,351
• Publication Number:
  US 20080297764A1
• Time in Patent Office: Days
• US Class Current: 356/41
• 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: G01N 33/4925 measuring blood gas content, e.g. O2, CO2 , HCO3

Abstract

A sensor for measuring at least one body parameter, particularly blood and/or tissue parameters, is used for carrying out the measurements of electromagnetic radiation in the transmission or reflection methods, wherein the sensor uses at least one LED as a source of electromagnetic radiation. At least one photodetector is used as the receiving element. At least one LED is used in a non-invasive measurement of the parameters for ensuring a sufficiently high residual intensity of the radiation received by the photodetector and transmitted or reflected by the blood and/or tissue, wherein the LED has a light intensity of at least 200 millicandela and/or a light yield of at least 2 lumen/watt.

Claims

1. A sensor for measuring blood and/or tissue parameters using electromagnetic radiation by means of transmission or reflection methods, the sensor comprising at least one LED as a source of electromagnetic radiation, and a photo detector as a receiving element, further comprising, in a non-invasive measurement of a blood and/or tissue parameter and for ensuring a sufficiently high residual intensity of the radiation received by the photo detector and transmitted or reflected by the blood and/or tissue, wherein the at least one LED has a light intensity of at least 200 millicandela and/or a light yield of at least 2 lumen/watt.

2. The sensor according to claim 1, wherein the LED emits at least one of the wavelengths selected from the group 150 nm±

15%, 400 nm±

15%, 460 nm±

15%, 480 nm±

15%, 520 nm±

15%, 550 nm±

15%, 560 nm±

15%, 570 nm±

15%, 580 nm±

15%, 590 nm±

15%, 600 nm±

15%, 606 nm±

15%, 617 nm±

15%, 620 nm±

15%, 630 nm±

15%, 650 nm±

15%, 660 nm±

15%, 705 nm±

15%, 710 nm±

15%, 720 nm±

15%, 775 nm±

15%, 805 nm±

15%, 810 nm±

15%, 880 nm±

15%, 905 nm±

15%, 910 nm±

15%, 950 nm±

15%, 980 nm±

15%, 1050 nm±

15%, 1100 nm±

15%, 1200 nm±

15%, 1310 nm±

15%, 1380 nm±

15%, 1450 nm±

15%, 1600 nm±

15%, 1650 nm±

15%, 1800 nm±

15%, 2100 nm±

15%, 2800 nm±

15%.

3. The sensor according to claim 1, further comprising, for determining the carbon monoxide saturation SaCO in the blood, at least one LED having a gravity center wavelength in the range of 606 nm±

15% or 660 nm±

15% or 805 nm±

15%, and with a light intensity of at least 200 millicandela and a light yield of at least 2 lumen/watt.

4. The sensor according to claim 1, comprising, for determining the hemoglobin concentrations in the blood, at least one LED having a gravity center wavelength in the range of 1450 nm±

15% and/or 905 nm±

15% and/or 805 nm±

15%, and a light intensity of at least 100 millicandela and a light yield of at least 2 lumen/watt.

5. The sensor according to claim 1, further comprising, for determining cHb, by means of a wavelength of 1450 nm±

15%, an LED having a light intensity of at least 200 millicandela, and whose light yield is at least 6 lumen/watt.

6. The sensor according to claim 5, wherein the light intensity of the LED is at least 500 mCd.

7. The sensor according to claim 5, wherein the light intensity of the LED is at least 700 mCd.

8. The sensor according to claim 1, comprising a detector of a material selected from the group consisting of Si, Ge, InGaAs, AlGaAs, PbS, PbSe, InSb.

9. The sensor according to claim 1, comprising a detector of sandwich construction selected from at least two of the materials Si, Ge, InGaAs, AlGaAs, PbS, PbSe, InSb.

10. The sensor according to claim 1, comprising a detector of sandwich construction, wherein the detector material of the layer to which light is emitted first has a wavelength of essentially greater than 1000 nm, and a detector material located behind detects essentially wavelengths smaller than 1000 nm.

11. The sensor according to claim 1, comprising a photodetector of Ge and/or InGaAs and/or AlGaAs for detecting wavelengths in the range of greater than 1000 nm.

12. The sensor according to claim 1, comprising at least one photodetector of the material Si and/or Ge for detecting wavelengths in the range of greater than 100 nm.

13. The sensor according to claim 1, wherein the sensor is comprised of an upper part and a lower part, and wherein the upper part and the lower part are adapted to receive at least in one state of operation a human body part, and wherein at least one cushion is provided in an area between upper part and/or lower part, wherein the cushion is arranged adjacent to the human body part, and wherein the cushion is black or of a dark color.

14. The sensor according to claim 1, wherein at least three sources of electromagnetic radiation are arranged essentially as corner points of a spatial arrangement in the area of the sensor in such a way that the at least three sources of electromagnetic radiation are in at least one state of operation less than one centimeter away from the human body part.

15. The sensor according to claim 14, wherein at least three sources of electromagnetic radiation are arranged essentially as corner points of a spatial arrangement and wherein at least one additional source of electromagnetic radiation is arranged essentially in the middle between the other sources.

16. The sensor according to claim 1, wherein at least four sources of electromagnetic radiation are arranged essentially as corner points of a spatial arrangement and wherein an additional source of electromagnetic radiation is arranged essentially in the middle between the other sources.

17. The sensor according to claim 1, wherein, in at least one state of operation, a safe Hash algorithm is used for recognizing the sensor.

18. A method of selecting a suitable LEDs in a planned use of the LEDs for determining blood and/or tissue parameters, the method comprising determining by means of a spectrometer the criteria half value width, and/or center wavelength and/or peak wavelength of the LEDs, wherein defined limit values are present for the half value width and/or the center wavelength and/or the peak wavelengths, and using the LED when the LED is at least with respect to one criteria in the range of the accepted limit values.

19. The method according to claim 18, comprising using the method as a control method of an automated sorting plant.