4 ms·

Blood oxygen levels are also measured optically already. If you can find an optical property of blood (that depends on a particular substance) which can be meas

Blood oxygen levels are also measured optically already. If you can find an optical property of blood (that depends on a particular substance) which can be measured through the skin (infrared light can penetrate skin and flesh to some degree), you can build a sensor for it.

ilaksh 5y ago
Infrared. Got it. Thanks.
- _Microft 5y ago
  It is called near-infrared spectroscopy ("NIRS") and you can read more about it here: https://en.wikipedia.org/wiki/Near-infrared_spectroscopy https://en.wikipedia.org/wiki/Near-infrared_spectroscopy
- Someone 5y ago
  Could be something else. The wikipedia page on this technology (https://en.wikipedia.org/wiki/Noninvasive_glucose_monitor https://en.wikipedia.org/wiki/Noninvasive_glucose_monitor) mentions “bioimpedance spectroscopy, microwave/RF sensing, fluorescence technology, mid-infrared spectroscopy, near infrared spectroscopy, optical coherence tomography, optical polarimetry, raman spectroscopy, reverse iontophoresis, and ultrasound technolog“ That page also claims there isn’t any clinically or commercially viable product yet. That seems out of date to me, given that https://www.labiotech.eu/best-biotech/needle-free-glucose-monitoring-for-diabetes-medtech/ https://www.labiotech.eu/best-biotech/needle-free-glucose-mo... mentions 8 devices you can buy now.
  - FireBeyond 5y ago
    > That page also claims there isn’t any clinically or commercially viable product yet. That seems out of date to me, given that https://www.labiotech.eu/best-biotech/needle-free-glucose-mo https://www.labiotech.eu/best-biotech/needle-free-glucose-mo... mentions 8 devices you can buy now. "needle free" !- "non-invasive". Several of those devices are implanted subdermally.
  - kergonath 5y ago
    > raman spectroscopy And now I can’t stop thinking about wearing a Raman spectrometer on my wrist :)
Pokepokalypse 5y ago
Sure but oxygenation is strongly correlated with hemoglobin color, so it's very easy. Blood pressure, on the other hand, is very difficult to measure, and it fluctuates wildly based on a wide variety of confounding factors. It would be amazing if they figured out a way to get this information optically.

ilaksh 5y ago

Infrared. Got it. Thanks.

_Microft 5y ago
It is called near-infrared spectroscopy ("NIRS") and you can read more about it here: https://en.wikipedia.org/wiki/Near-infrared_spectroscopy https://en.wikipedia.org/wiki/Near-infrared_spectroscopy
Someone 5y ago
Could be something else. The wikipedia page on this technology (https://en.wikipedia.org/wiki/Noninvasive_glucose_monitor https://en.wikipedia.org/wiki/Noninvasive_glucose_monitor) mentions “bioimpedance spectroscopy, microwave/RF sensing, fluorescence technology, mid-infrared spectroscopy, near infrared spectroscopy, optical coherence tomography, optical polarimetry, raman spectroscopy, reverse iontophoresis, and ultrasound technolog“ That page also claims there isn’t any clinically or commercially viable product yet. That seems out of date to me, given that https://www.labiotech.eu/best-biotech/needle-free-glucose-monitoring-for-diabetes-medtech/ https://www.labiotech.eu/best-biotech/needle-free-glucose-mo... mentions 8 devices you can buy now.
- FireBeyond 5y ago
  > That page also claims there isn’t any clinically or commercially viable product yet. That seems out of date to me, given that https://www.labiotech.eu/best-biotech/needle-free-glucose-mo https://www.labiotech.eu/best-biotech/needle-free-glucose-mo... mentions 8 devices you can buy now. "needle free" !- "non-invasive". Several of those devices are implanted subdermally.
- kergonath 5y ago
  > raman spectroscopy And now I can’t stop thinking about wearing a Raman spectrometer on my wrist :)

Pokepokalypse 5y ago

Sure but oxygenation is strongly correlated with hemoglobin color, so it's very easy. Blood pressure, on the other hand, is very difficult to measure, and it fluctuates wildly based on a wide variety of confounding factors. It would be amazing if they figured out a way to get this information optically.