Faq - Cortexa Technology DermaLab Mini Instructions For Use Manual

23 FAQ

In the FAQ below please find answers to questions not to be found elsewhere in this manual.
General:
Q: In the main screen, some buttons are lit although no probe is connected.
A: - Some parameters require a probe as well as an internal module. The internal module is recognized
even though the probe is not connected (elasticity, sebum, and ph).
Specifically TEWL:
Q: Why does the measurement not stabilize and stop?
A: - There may be a leak between probe and skin surface. Reposition the probe to align with skin sur-
face.
- Environmental conditions may be unstable. Check the environment for open doors, windows, direct
light (sensors are light sensitive), heat sources, ventilation equipment etc.
Q: When does the TEWL measurement stop?
A: - When the measurement is stable, it stops automatically. The default stop criteria is a standard dev.
of 0.2. if no stop criteria is set, the measurement will not stop.
Q: What are the individual sensor values used for?
A: - The sensor values (T
in case the TEWL value behaves unexpectedly.
Q: When and how are the environmental measurements done?
A: - The environmental T and RH is measured by one of the sensor pairs in the probe upon entering the
TEWL application. As the same sensor pair is used during the TEWL measurement procedure, it is
important to document the environmental conditions prior to initiating skin measurements.
Specifically Ultrasound:
Q: The probe scans, but there is no or just a very weak image on the screen?
A: - The probe lacks water. Check the membrane for holes and replace if necessary. Refill the probe.
- Too low gain setting. Adjust the gain.
Why not use tap water in the probe?
Q:
- Tap water quality varies, and it may leave mineral deposits in the probe mechanics and on the
A:
transducer front, which may lead to malfunction and/or poor image quality. Use deionized water.
- Fresh tap water contains many tiny air bubbles, which impacts the ultrasound signal transmission.
What does the image colors mean?
Q:
- Colors are not tissue specific but relate to the reflected signal strength – black is minimal strength,
A:
white is maximum.
Should I use water or gel as the coupling medium?
Q:
- The use of water or gel is a matter of personal preference. Water spreads evenly and more easily,
A:
gel stays on the skin but is more likely to collect air bubbles. NB! The use of gel does not apply to the
Ultrasound Narrow probe.
Why do I get horizontal black lines across the image?
Q:
- Horizontal black lines are caused by air bubbles in the gel/water used as a coupling medium. Re-
A:
new the gel/water after wiping off residuals left on the probe front and the skin.
Specifically Hydration:
Q: The DermaLab Mini measures skin conductance. What is the difference to skin capacitance?
- Skin conductance is the skin's ability to conduct an electrical, alternating current as opposed to skin
A:
capacitance, which is the ability to accumulate an electrical charge.
As the cell fluids of the live epidermis are highly conductive, the dynamic range of the conductance
measurement is mainly impacted by the water binding capacity of the stratum corneum. Accordingly,
the conductance measurement is more superficial and well defined compared to the capacitance
principle, which goes deeper and to a higher extent incorporates both stratum corneum and live epi-
dermal cells.
) may provide "diagnostic" information for troubleshooting
, RH
upper/lower upper/lower
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