Patent ID: 7316777

Claim:
A device for joining tubing to a zero dead volume fitting body for chromatography, said zero dead volume fitting body having a zero dead volume body fitting detail; said zero dead volume fitting detail having a zero dead volume fitting detail bore sized to receive said tubing; said zero dead volume fitting detail bore terminating at a zero dead volume fitting detail bore bottom; said zero dead volume fitting detail having a zero dead volume fitting detail ferrule seat; said zero dead volume fitting detail having female threads therein; said device comprising: a ferrule freely rotatably interlocked with a nut; said ferrule having a ferrule axial passage therethrough; said ferrule axial passage sized to permit said tubing to pass therethrough; said ferrule having a ferrule first end and a ferrule second end; said ferrule being wedge-shaped proximate said ferrule first end; said ferrule being radially compressible proximate said ferrule first end; said ferrule sized concentrically proximate said ferrule first end to constrict about said tubing upon compression; said ferrule second end having a ferrule second end neck; said ferrule second end neck having a ferrule neck diameter; said ferrule second end having a ferrule second end collar; said ferrule second end collar having a ferrule second end collar diameter; said ferrule second end collar diameter being greater than said ferrule second end neck diameter; and said nut having a nut axial passage therethrough; said nut axial passage sized to permit said tubing to pass therethrough; said nut having male threads; said male threads of said nut being sized to be received by said female threads of said zero dead volume fitting detail; said nut having a nut first end and a nut second end; said nut first end having a nut collar socket; said nut collar socket sized to receive said ferrule second end collar without interference; said nut first end having a nut first end neck bore adjacent said nut collar socket; said nut first end neck bore sized to receive said ferrule second end neck without interference; said nut first end neck bore sized to permit passage of said ferrule second end collar by an interference fit.