Test Application from TQC
Test Facility for Small Medical Device
The facility is designed to
leak test a sealed medical device. The test is to a limit which
is intended to ensure that no inward leakage will occur at pressures
up to 0.5 bar differential. An air leakage limit of the order of
20 mm3/sec is considered to meet this requirement and the actual
equipment is set to operate below this value.
The medical devices are sealed
with an enclosed internal volume, therefore the test method is to
enclose the capsule in a pressurised chamber and measure any pressure
decay due to leakage in the capsule. this is done using the standard
air decay sequence of a nolek TS600 leak test instrument. However,
in order to check for gross leaks (which would equalise pressure
internally and therefore invalidate the test) a dosing system is
added to the basic instrument (the new designation being TS624)
The test fixture is a simple
bench mounting unit with a slide in drawer containing the lower
half of the test chamber. The upper half is clamped by a pneumatic
cylinder which can only operate when the drawer is fully closed.
Once the drawer is closed, an interlock valve is operated which
allows a pneumatic signal from the instruments auto connector output
to operate the cylinder via a pilot operated valve.
TQC welcomes the opportunity to design and
manufacture complete medical leak test systems to client specifications,
whether you have a simple bench top application or a more complex
automated leak test requirement. Contact our engineers to advise
you on your automation project.