...I can't think of any other translation (in any event, within a medical (instrument) context ...its got to be a syphon or syringe...)....Good Luck...><))):>...

The device you are tramslating about seems to be what is called a SQUID:
"The development of a new, extremely sensitive generation of
measurement devices – the SQUIDs (superconducting
quantum inference devices) therefore facilitated a major
breakthrough in the investigation of the brain’s magnetic
field. SQUIDs are based on the physical principle of
Josephson’s effect of superconductivity and therefore have
to be operated at a temperature of 4.2 K by immersion in a
bath of liquid helium within a cryogenic vessel (dewar)" (link 2)
Link 1 gives you a description about refilling the device with helium, they mention a device called liquid pickup, where liquid refers to the helium.