Hemodialysis system including a disposable set and a dialysis instrument

A hemodialysis system comprising:

• a dialyzer;
• a container including a physiologically compatible solution;
• a disposable set including:
• a blood pumping tube or chamber fluidly connected to a first end of the dialyzer,
• an arterial line fluidly connected to a first end of the blood pumping tube or chamber,
• a venous line fluidly connected to a second end of the dialyzer,
• a physiologically compatible solution line fluidly connected to the blood pumping tube or chamber and the container, and
• a dialyzer line fluidly connected to a second end of the blood pumping tube or chamber and the second end of the dialyzer,
• wherein the physiologically compatible solution line includes a branch line that is fluidly connected to the dialyzer line;
• and
• a dialysis instrument including
• an arterial line clamp positioned and arranged to control fluid flow through the arterial line,
• a venous line clamp positioned and arranged to control fluid flow through the venous line,
• a physiologically compatible solution valve positioned and arranged to control fluid flow through the physiologically compatible solution line, and
• a second physiologically compatible solution valve positioned and arranged to control fluid flow through the branch line,
• wherein the dialysis instrument is configured to use the physiologically compatible solution from the container via the physiologically compatible solution line to rinse blood out of the venous line by causing the arterial line clamp to close, the venous line clamp to open, the physiologically compatible solution valve to open, and the second physiologically compatible solution valve to close.