Device for reversing the blood flow for an extracorporeal blood treatment device and method for determining the reversal of the blood flow during an extracorporeal blood treatment

A device for reversing blood flow, for an extra-corporeal blood treating apparatus which comprises an extra-corporeal blood circuit which has an arterial blood line outgoing from a patient which runs to a blood treating unit and a venous blood line outgoing from the blood treating unit which runs to the patient, the device for reversing flow comprising:

• a first valve-action body having a first patient-side connection for a first patient-side portion, formed of flexible tubing, of the blood line and a second patient-side connection for a second patient-side portion, formed of flexible tubing, of the blood line,
• a second valve-action body having a first apparatus-side connection for a first apparatus-side portion, formed of flexible tubing, of the blood line and a second apparatus-side connection for a second apparatus-side portion, formed of flexible tubing, of the blood line, the first and second valve-action bodies being rotatable with respect to each other on an axis in such a way that,
• in a first relative position between the first and second valve-action bodies, a connection for liquid is made between the first patient-side connection and the first apparatus-side connection, and a connection for liquid is made between the second patient-side connection and the second apparatus-side connection, and
• in a second relative position between the first and second valve bodies, a connection for liquid is made between the first patient-side connection and the second apparatus-side connection, and a connection for liquid is made between the second patient-side connection and the first apparatus-side connection;
• and
• a communications arrangement configured to receive a high-frequency electromagnetic field from a reading arrangement belonging to the extra-corporeal blood treating apparatus and to generate at least one code which is characteristic of one of the first and second relative positions of the valve-action bodies and which is readable by the reading arrangement;
• wherein the communications arrangement includes a first RFID transponder and a second RFID transponder, the first RFID transponder configured to transmit a code which is characteristic of the first relative position and the second RFID transponder configured to transmit a code which is characteristic of the second relative position;
• wherein, in the first relative position, only the transceiver of the first RFID transponder is connected to an aerial and, in the second relative position, only the transceiver of the second RFID transponder is connected to an aerial, so that in the first relative position only the first RFID transponder configured to transmit the code characteristic of the first position is readable by the reading arrangement, and in the second relative position only the second RFID transponder configured to transmit the code characteristic of the second position is readable by the reading arrangement.

A blood treating apparatus, comprising:

• a device for reversing blood flow, for an extra-corporeal blood treating apparatus which comprises an extra-corporeal blood circuit which has an arterial blood line outgoing from a patient which runs to a blood treating unit and a venous blood line outgoing from the blood treating unit which runs to the patient, the device for reversing flow comprising:
• a first valve-action body having a first patient-side connection for a first patient-side portion, formed of flexible tubing, of the blood line and a second patient-side connection for a second patient-side portion, formed of flexible tubing, of the blood line,
• a second valve-action body having a first apparatus-side connection for a first apparatus-side portion, formed of flexible tubing, of the blood line and a second apparatus-side connection for a second apparatus-side portion, formed of flexible tubing, of the blood line, the first and second valve-action bodies being rotatable with respect to each other on an axis in such a way that,
• in a first relative position between the first and second valve-action bodies, a connection for liquid is made between the first patient-side connection and the first apparatus-side connection, and a connection for liquid is made between the second patient-side connection and the second apparatus-side connection, and
• in a second relative position between the first and second valve bodies, a connection for liquid is made between the first patient-side connection and the second apparatus-side connection, and a connection for liquid is made between the second patient-side connection and the first apparatus-side connection;
• and
• a communications arrangement configured to receive a high-frequency electromagnetic field from a reading arrangement belonging to the extra-corporeal blood treating apparatus and to generate at least one code which is characteristic of one of the first and second relative positions of the valve-action bodies and which is readable by the reading arrangement;
• an arterial blood line;
• a venous blood line;
• a blood treating unit;
• a reading arrangement;
• an arrangement configured to determine a parameter of the blood treatment on the basis of a first measurement of a characteristic variable before the reversal of blood flow and a second measurement of a characteristic variable after the reversal of blood flow, and
• an alarm unit configured to co-operate with the arrangement configured to determine a parameter of the blood treatment in such a way that the alarm unit provides an alarm if, after the first measurement, the reading arrangement has not received the code characteristic of the first relative position and if, after the second measurement, the reading arrangement has not received the code characteristic of the second relative position;
• wherein the apparatus is configured to carry out an extra-corporeal blood treatment in which, in the extra-corporeal blood circuit, the blood of a patient flows via the arterial blood line to the blood treating unit and via the venous blood line from the blood treating unit to the patient, the device for reversing blood flow being connected into the arterial and venous blood lines, the reading arrangement being configured such that the code characteristic of the first or second relative position is readable by the communications arrangement of the device for reversing blood flow.