When Manchester Royal Eye Hospital was opened in 1814 'glass
eyes' were true to their name. Over two centuries later ocular
prostheses are most commonly made out of medical grade acrylic and
are formed in the shape of convex shells in order to cover the
structures inside the eye socket.
Ocular prostheses are custom made for patients when there is an
absence of a natural eye. Each prosthesis must be fabricated and
fitted especially for the patient by an ocularist. NHS
ocularists working in the Department of Ocular
Prosthetics at Manchester Royal Eye Hospital are
responsible for fabricating and fitting ocular prostheses, cosmetic
shells and facial prostheses. Part of the fabrication
process is the heat curing cycle, in which the medical
grade acrylic which the prosthetic eyes are made out of is
exposed to high temperatures so that it hardens
and is suitable for wear.
The ocularists use Tinytag Ultra 2
thermocouple data loggers to monitor temperatures
during the heat curing cycle to ascertain that the acrylic has been
cured at the optimum temperature (a temperature range of
200°C to 1300°C for the correct amount of time).
If the acrylic is not cured properly, the material does not
harden fully and remains porous, resulting in monomer leaking out
of the acrylic and causing irritation for the wearer. It is
therefore imperative that temperatures are recorded during
the cycle. Tinytag thermocouple data
loggers are ideal for use in this application, as their
thermocouple probes offer fast response monitoring in temperatures
from -200°C to +1370°C.
To monitor the heat curing cycle, the data logger's thermocouple
probe measures the temperature within the heat curing tank, while
the data logger itself remains outside the tank recording the
readings taken by the probe. The data from each cycle is
downloaded, viewed and analysed using Tinytag
Explorer software. If the temperatures are found to have fallen
outside the desired parameters, indicating that the acrylic may
have not cured properly, the cycle is repeated to ensure that the
prosthesis is properly cured.
Using Tinytags to monitor temperatures
during the heat curing cycles gives the team at
Manchester Royal Eye Hospital peace of mind that
the acrylic has cured properly and therefore will give the best
possible results for their patients. Feedback from the department
states that the service they receive from Gemini Data Loggers is
"always helpful and efficient".
Tinytag Ultra 2
Thermocouple data loggers are compatible with K, J, T and N
thermocouple sensors and can measure from -200°C to
+1370°C, offering fast response monitoring in high