Patent ID: 8632487
Filing Date: 2014-01-21
Classification: A61M

Abstract:
1. An extracorporeal blood treatment apparatus comprising: a device for transporting blood in a blood conduit of an extracorporeal blood circuit that has an arterial blood conduit leading to a blood treatment unit and a venous blood conduit leading away from the blood treatment unit; means for collecting blood that has a specified closed volume, said means for collecting blood being located in the venous blood conduit, and, an apparatus for controlling the device for transporting blood, said apparatus for controlling the device for transporting blood comprising: means for setting a particular volume flow for the blood flowing in the blood conduit; means for producing a control signal for the device for transporting blood in the blood conduit, wherein the control signal is dimensioned such that the blood in the blood conduit is transported at the specified volume flow rate; means for setting at least one particular pressure limit value for the blood conduit; means for measuring the pressure in the blood conduit; and means for comparing the pressure in the blood conduit with the at least one specified pressure limit value, wherein the means for producing a control signal is configured such that the control signal is produced when the specified pressure limit value in the blood conduit is reached, wherein the control signal is dimensioned such that when the blood is transported in the blood conduit, a pressure is established that conforms to the at least one pressure limit value, wherein the blood treatment apparatus is designed as a blood treatment apparatus for operation with one patient connection point, wherein the arterial blood conduit and the venous blood conduit have a common patient connection point, wherein the device for transporting blood is a device for producing a specified pressure in the means for collecting blood, such that blood that has collected in the means for collecting blood can be displaced from the means for collecting blood, the device for transporting blood further comprising: means for storing air which has a closed volume, and means for compressing air, which is in flow connection, via a connection path, with the means for storing air and the means for collecting blood, wherein air from the means for storing air can be conveyed into the means for collecting blood, thereby displacing the blood that has collected in the means for collecting blood, and wherein the means for producing a control signal comprises: a first control circuit comprising means for calculating a reference pressure for the closed volume of the means for collecting blood, which is dimensioned such that the specified volume flow rate is achieved in the venous blood conduit, and a second control circuit comprising a control signal for the means for compressing air, which is dimensioned such that the calculated reference pressure is achieved in the closed volume of the means for collecting blood, at which the specified volume flow rate is achieved in the venous blood conduit.