Pulse oximetry device and method of operating a pulse oximetry device
View Patent ↗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 first light detector has a first light reception surface, 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.
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 the wavelength in the first wavelength interval, but not to respond to light with the wavelength in the second wavelength interval, and
a second light detector configured to detect the light with the wavelength in the first wavelength interval and detect the light with the wavelength in the second wavelength interval,
wherein the first light detector has a first light reception surface, 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.
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 lies below a wavelength of 810 nm, and the other wavelength interval lies above a wavelength of 810 nm.
4. The pulse oximetry device according to claim 1 , wherein the first light detector has a filter configured to filter out the light with the wavelength in the second wavelength interval.
5. The pulse oximetry device according to claim 1 , wherein the light emission device is configured to emit the light with the wavelength in the second wavelength interval with a higher power than the light with the wavelength in the first wavelength interval.
6. The pulse oximetry device according to claim 1 , wherein the light emission device has a first light-emitting diode structure configured to emit the light with the wavelength in the first wavelength interval, and a second light-emitting diode structure configured to emit the light with the wavelength in the second wavelength interval.
7. The pulse oximetry device according to claim 6 , wherein the first light-emitting diode structure and the second light-emitting diode structure are arranged in a common light-emitting diode chip.
8. The pulse oximetry device according to claim 7 , wherein the first light-emitting diode structure and the second light-emitting diode structure are arranged or stacked on top of one another.
9. The pulse oximetry device according to claim 6 , wherein the light emission device has a first light-emitting diode chip having the first light-emitting diode structure, and a second light-emitting diode chip having the second light-emitting diode structure.
10. The pulse oximetry device according to claim 1 , wherein the pulse oximetry device has a housing with an emitter cavity and a detector cavity,
the light emission device is arranged in the emitter cavity, and the first light detector is arranged in the detector cavity.
11. The pulse oximetry device according to claim 10 , wherein the second light detector is arranged in the detector cavity.
12. The pulse oximetry device according to claim 10 , wherein the emitter cavity and the detector cavity are open to a common surface of the housing.
13. The pulse oximetry device according to claim 10 , wherein a wall of the emitter cavity forms an optical reflector.
14. The pulse oximetry device according to claim 10 , wherein the housing has a further emitter cavity in which a further light emission device is arranged.
15. A method of operating a pulse oximetry device comprising:
emitting light with a wavelength in a first wavelength interval and simultaneously emitting light with a wavelength in a second wavelength interval;
recording a first measurement signal with a first light detector configured to detect the light with the wavelength in the first wavelength interval, but not to respond to the light with the wavelength in the second wavelength interval;
recording a second measurement signal with a second light detector configured to detect the light with the wavelength in the first wavelength interval and detect the light with the wavelength in the second wavelength interval,
wherein the first light detector has a first light reception surface, 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; and
calculating an oxygen saturation from the first measurement signal and the second measurement signal.
16. The method according to claim 15 , wherein a difference signal is formed by subtracting the first measurement signal from the second measurement signal, and
the oxygen saturation is calculated from the first measurement signal and the difference signal.
17. The method according to claim 15 , wherein the light with the wavelength in the second wavelength interval is emitted with a higher power than the light with the wavelength in the first wavelength interval.