Access disconnection systems with arterial and venous line conductive pathway

An extracorporeal blood system comprising:

• an extracorporeal blood machine;
• an arterial line extending from the extracorporeal blood machine;
• a venous line extending from the extracorporeal blood machine;
• an access disconnection circuit for detecting an access disconnection of at least one of the arterial or venous lines from a patient, the access disconnection circuit including (i) a signal generation source positioned and arranged to inject an electrical signal into the arterial or venous lines, (ii) a conductive pathway electrically communicating blood traveling through the arterial line with blood traveling through the venous line, and (iii) a signal processing unit including first and second electrical lines placed in electrical communication with blood flowing through the same one of the arterial and venous lines, the signal processing unit processing the signal generated by the source for detecting the disconnection of the at least one of the arterial or venous lines.

An extracorporeal blood system comprising:

• an extracorporeal blood machine;
• an arterial line extending from the extracorporeal blood machine;
• a venous line extending from the extracorporeal blood machine;
• an access disconnection circuit for detecting an access disconnection of at least one of the arterial or venous lines from a patient, the access disconnection circuit including (i) a signal generation source positioned and arranged to inject an electrical signal into the same one of the arterial or venous lines, (ii) a signal processing unit positioned and arranged to process the signal generated by the source for detecting the disconnection of the at least one of the arterial and venous lines, and (iii) a conductive pathway, separate from the signal generation source and the signal processing unit, placed in electrical communication with the arterial and venous lines so as to electrically bypass the extracorporeal blood machine.