a cartridge containing a biologically compatible compressed gas, said cartridge being attachable to said pressure supply conduit for communicating said pressurized gas from {HEAD ~ said cartridge} to said {TAIL ~ pressure supply conduit} 
a cartridge containing a biologically compatible compressed gas , said cartridge being attachable to said pressure supply conduit for communicating said pressurized gas from { HEAD ~ said cartridge } to said { TAIL ~ pressure supply conduit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL