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

Patent metadata

Field	Value
Publication number	US-9610395-B2
Application number	US-201414306570-A
Country	US
Kind code	B2
Filing date	Jun 17, 2014
Priority date	Oct 8, 2008
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

The invention relates to a device for reversing the blood flow for an extracorporeal blood treatment device, comprising an extracorporeal blood circuit (I), which includes an arterial blood line ( 108 A) leading from a patient to a blood treatment unit ( 204 ) and a venous blood line ( 106 A) leading from the blood treatment unit to the patient. Furthermore, the invention relates to an extracorporeal blood treatment device with a device for reversing the blood flow, and to a method for determining the reversal of the blood flow during an extracorporeal blood treatment. The device for reversing the blood flow for an extracorporeal blood treatment device according to the invention comprises two valve bodies ( 102, 104 ) which are rotated relative to one another for reversing the blood flow. The device for reversing the blood flow according to the invention is characterized by a communication device ( 210 ) for receiving an electromagnetic high-frequency field from a read unit ( 270 ) of the extracorporeal blood treatment device and for generating at least one identifier characterizing the position of the valve bodies which can be read by the read device.

First claim

The invention claimed is:

1. 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, 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;

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 an RFID transponder configured to identify a direction of blood flow and to transmit a code characteristic of the first relative position and a code characteristic of the second relative position; and

a detection arrangement configured to detect the first and second relative positions of the valve-action bodies and to co-operate with the RFID transponder in such a way that, in the first relative position, the code characteristic of the first relative position is readable by the reading arrangement and, in the second relative position, the code characteristic of the second position is readable by the reading arrangement.

2. The device according to claim 1 , wherein the RFID transponder is a passive transponder.

3. A blood treating apparatus, comprising:
the device for reversing blood flow according to claim 1 ,
an arterial blood line;
a venous blood line;
a blood treating unit; and
an RFID reader;
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 RFID reader being configured such that the code characteristic of the first or second relative position is readable from the communications arrangement of the device for reversing blood flow; and
wherein the apparatus further comprises:
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 RFID reader has not received the code characteristic of the first relative position and if, after the second measurement, the RFID reader has not received the code characteristic of the second relative position.

4. A method of treating blood, comprising:
connecting the device for reversing blood flow according to claim 1 to an extra-corporeal blood circuit, the extra-corporeal blood circuit comprising an arterial blood line, a venous blood line, and a blood treating unit;
connecting the arterial blood line and the venous blood line to a patient;
carrying 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;
turning the valve-action bodies to produce an identification signal; and
recognizing the communications arrangement of the device for reversing blood flow to detect a change between the code characteristics of the first and second relative positions within a preset interval of time.

5. The device according to claim 1 , wherein the detection arrangement comprises a position-dependent switch.

6. The device according to claim 1 , wherein the detection arrangement comprises a resistive angle sensor.

7. The device according to claim 1 , wherein the detection arrangement comprises a capacitive angle sensor.

8. A system comprising an extra-corporeal blood treating apparatus and the device of claim 1 , wherein the extra-corporeal blood treating apparatus comprises an RFID reader configured to produce a high-frequency electromagnetic field and configured to read at least one code that is characteristic of one of the first and second positions of the valve-action bodies.

Assignees

• Fresenius Medical Care Deutschland Gmbh

Inventors

• Maierhofer Andreas
• Gross Malte

Classifications

• A61M39/223

  Multiway valves · CPC title

• A61M2205/6018

  providing set-up signals for the apparatus configuration · CPC title

• A61M1/3656

  Monitoring patency or flow at connection sites; Detecting disconnections · CPC title

• A61M2039/1044

  Verifying the connection, e.g. audible feedback, tactile feedback, visual feedback, using external light sources · CPC title

• A61M2205/6054

  Magnetic identification systems · CPC title