The Elasticity Probe - Cortexa Technology DermaLab Mini Instructions For Use Manual

r = radius of the surface (0.005 m)
s = thickness of surface (skin thickness, adjustable but set to 0.001 m by default)
Inserting reasonable assumptions, known probe constants and a default skin thickness of 1 mm
leads to:
The elasticity modulus E depends entirely on the height x measured by the probe at the end of
the elevation phase and the applied vacuum. Young´s modulus (E) carries the unit MPa (mega
Pascal).
The instrument features 3 settings for the vacuum applied to the skin - Soft, Normal and Firm. The
selection of the actual range should be made by the user before the measurement is started given
the nature of the skin to be measured. For example, Soft is used when measuring the soft/loose
skin under the eyes and Normal is used when measuring on an arm. Firm is used for measuring
on thick and stiff skin - for example sclerotic skin or the palm of the hand.
2) Retraction time.
Retraction time (R) is the time in milliseconds it takes for the skin to retract from the peak eleva-
tion to 33% of the peak elevation. This is indicated in the red section of the graph on the elasticity
screen.
3) Visco Elasticity.
Dividing the elasticity modulus by the retraction time provides a parameter (Visco Elasticity, VE),
where both the elevation phase and the retraction phase contribute. R is normalized by a retrac-
tion time of 260 ms as a typical average of underarm readings (caucasian skin, age 28 – 60).
VE = Young´s modulus/R
VE carries the unit MPa (mega Pascal).

8.2 The Elasticity Probe

The elasticity probe is connected to the input connector on the rear panel (electrical connector
and Luer Lock air connector).
The use of double-sided adhesive rings on the probe surfaces in contact with the skin is required
to obtain reproducible results. First mount the adhesive ring on the probe face, then pull off the
adhesive cover before placing the probe firmly on skin. Prior to placing the probe, the skin surface
should be clean and dry for the probe to adhere.
Exchanging the adhesive ring between measurements is highly recommended to obtain optimal
adhesion and complete air tightness.
����

E = 0.3125
����
where R
normalized
Elasticity probe with adhesive ring.
CORTEX TECHNOLOGY ApS
= R/260 ms.
normalized
27/66