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