IceCure Medical Ltd.
DSR3000000 rev.L
Confidential
User Manual
97
IceSense3™
12
TEMPERATURE DISTRIBUTION ANALYSIS IN HOMOGENEOUS MEDIUM
A model of a homogenous medium, that freezes at 0°C, and is cooled with a round 3.4mm diameter
cold finger is used in order to estimate the radial distance from the 0°C isotherm (border of ice ball)
to the -20°C and -40°C isotherms respectively.
The model that was used is a theoretical model with the following characteristics and assumptions:
1.
Homogenous medium
2.
The temperature cold finger surface is T(cf)=-170°C
3.
The temperature of the homogenous medium is 37°C T(medium) = 37°C
4.
A visible ice ball is created at the 0°C isotherm
5.
Exponential temperature distribution according to:
T(x) = T (medium) – (T (medium) - T (cf))*exp (-a*x) = 37-207*exp (-a*x)
Where: X is the radial distance from the cold finger.
With these assumptions calculations show:
Examples:
1.
If the diameter of the 0°C isotherm is measured to be 20mm, the diameter of the -20°C
isotherm is estimated to be 15.8mm and the diameter of the -40°C isotherm is estimated to
be 12.9.
2.
If one desires to obtain a diameter of 20.3 mm with -20°C, the estimated Ice ball diameter
that is required is 26mm.
3.
If one desires to obtain a diameter of 15.2 mm with -40°C, the estimated Ice ball diameter
that is required is 24mm.
