Patent ID: 7537688

Claim:
A blood purification device adapted to detect re-circulated blood flowing in said arterial blood circuit route, the re-circulated blood being blood that was returned to the patient from said venous blood circuit route but again directed to the arterial blood circuit route, the blood purification device comprising: a blood circuit route having an arterial blood circuit route and a venous blood circuit route to circulate extracorporeally the blood collected from a patient; a blood pump provided in said arterial blood circuit route; a blood purification means connected between said arterial blood circuit route and said venous blood circuit route, and purifies the blood flowing in said blood circuit route; a blood concentration means to provide a specific peak in blood concentration by concentrating the blood; a detecting means to detect the specific peaks in blood concentration provided by said blood concentration means, said detecting means further comprising a first detecting means provided to said arterial blood circuit route and a second detecting means provided to said venous blood circuit route; and a calculation means adapted for calculating a proportion of the re-circulated blood within the blood flowing in said arterial blood circuit route by comparing specific peaks in blood concentration detected by said first detecting means and said second detecting means.