Pulse oximetry device and method of operating a pulse oximetry device

Abstract

A pulse oximetry device includes a light emission device configured to emit light with a wavelength in a first wavelength interval and light with a wavelength in a second wavelength interval, a first light detector configured to detect light with a wavelength in the first wavelength interval, but not to respond to light with a wavelength in the second wavelength interval, and a second light detector configured to detect light with a wavelength in the first wavelength interval and detect light with a wavelength in the second wavelength interval, wherein the light emission device has a first light-emitting diode structure configured to emit light with a wavelength in the first wavelength interval, and a second light-emitting diode structure configured to emit light with a wavelength in the second wavelength interval, and the first light-emitting diode structure and the second light-emitting diode structure are arranged in a common light-emitting diode chip.

What is claimed is: 
     
         1 . A pulse oximetry device comprising:
 a light emission device configured to emit light with a wavelength in a first wavelength interval and light with a wavelength in a second wavelength interval,   a first light detector configured to detect light with a wavelength in the first wavelength interval, but not to respond to light with a wavelength in the second wavelength interval, and   a second light detector configured to detect light with a wavelength in the first wavelength interval and detect light with a wavelength in the second wavelength interval,   wherein the light emission device has a first light-emitting diode structure configured to emit light with a wavelength in the first wavelength interval, and a second light-emitting diode structure configured to emit light with a wavelength in the second wavelength interval, and   the first light-emitting diode structure and the second light-emitting diode structure are arranged in a common light-emitting diode chip.   
     
     
         2 . The pulse oximetry device according to  claim 1 , wherein the first wavelength interval and the second wavelength interval do not overlap one another. 
     
     
         3 . The pulse oximetry device according to  claim 2 , wherein the first wavelength interval or the second wavelength interval is below a wavelength of 810 nm, and the other wavelength interval is a wavelength above 810 nm. 
     
     
         4 . The pulse oximetry device according to  claim 1 , wherein the first light detector has a filter configured to filter out light with a wavelength in the second wavelength interval. 
     
     
         5 . The pulse oximetry device according to  claim 1 , wherein the first light detector has a first light reception surface, and the second light detector has a second light reception surface, and
 the first light reception surface and the second light reception surface are arranged in a common plane and are interleaved with one another.   
     
     
         6 . The pulse oximetry device according to  claim 1 , wherein the light emission device is configured to emit light with a wavelength in the second wavelength interval with a higher power than light with a wavelength in the first wavelength interval with a power that is at least four times as high. 
     
     
         7 . The pulse oximetry device according to  claim 1 , wherein the first light-emitting diode structure and the second light-emitting diode structure are stacked on top of one another. 
     
     
         8 . The pulse oximetry device according to  claim 1 , further comprising a housing with an emitter cavity and a detector cavity,
 wherein the light emission device is arranged in the emitter cavity, and the first light detector is arranged in the detector cavity.   
     
     
         9 . The pulse oximetry device according to  claim 8 , wherein the second light detector is arranged in the detector cavity. 
     
     
         10 . The pulse oximetry device according to  claim 8 , wherein the emitter cavity and the detector cavity are open to a common surface of the housing. 
     
     
         11 . The pulse oximetry device according to  claim 8 , wherein a wall of the emitter cavity forms an optical reflector. 
     
     
         12 . The pulse oximetry device according to  claim 8 , wherein the housing has a further emitter cavity in which a further light emission device is arranged. 
     
     
         13 . A method of operating a pulse oximetry device, comprising:
 emitting light with a wavelength in a first wavelength interval with a first light-emitting diode structure, and simultaneously emitting light with a wavelength in a second wavelength interval with a second light-emitting diode structure, wherein the first light-emitting diode structure and the second light-emitting diode structure are arranged in a common light-emitting diode chip;   recording a first measurement signal with a first light detector configured to detect light with a wavelength in the first wavelength interval, but not to respond to light with a wavelength in the second wavelength interval;   recording a second measurement signal with a second light detector configured to detect light with a wavelength in the first wavelength interval and detect light with a wavelength in the second wavelength interval; and   calculating an oxygen saturation from the first measurement signal and the second measurement signal.   
     
     
         14 . The method according to  claim 13 , wherein a difference signal is formed from a difference of the first measurement signal and the second measurement signal, and the oxygen saturation is calculated from the first measurement signal and the difference signal. 
     
     
         15 . The method according to  claim 13 , wherein the light with a wavelength in the second wavelength interval is emitted with a higher power than the light with a wavelength in the first wavelength interval with a power that is at least four times as high.