Extracorporeal blood treatment machine comprising a poka-yoke for a pressure sensor
An extracorporeal blood treatment machine includes a blood treatment device, a conveying device for conveying blood through the blood treatment device, and a connection mask designed to interchangeably receive a tube set in a predefined arrangement. The tube set has pressure-monitoring lines that branch off from the tube set and can be connected to pressure sensor connections located on the connection mask. The pressure sensor connections are spaced apart and positioned so as to match the tube set such that, when the tube set is mounted in the predefined arrangement on the connection mask, each pressure-monitoring line, owing to its limited length and the predefined arrangement of the associated branch on the blood treatment machine, can be connected exclusively to only one of the pressure sensor connections. A corresponding tube set is used with the extracorporeal blood treatment machine.
1. A system for extracorporeal blood treatment comprising:
an extracorporeal blood treatment machine; and
a tube set that is detachably mountable on the extracorporeal blood treatment machine in a predefined arrangement;
the extracorporeal blood treatment machine comprising:
a blood treatment device, a conveying device for conveying blood through the blood treatment device, and a connection mask on which at least two pressure sensor connections are located;
the at least two pressure sensor connections including a first pressure sensor connection and a second pressure sensor connection;
the tube set comprising a blood supply line for supplying blood to the blood treatment device, a blood return line for returning treated blood from the blood treatment device, a pump section adapted and provided to be inserted into the conveying device, and at least two pressure-monitoring lines,
the at least two pressure-monitoring lines including a first pressure-monitoring line and a second pressure-monitoring line,
the first pressure-monitoring line branching off of the tube set at a first branch, and the second pressure-monitoring line branching off of the tube set at a second branch,
the first pressure-monitoring line having a first length and being connectable to the first pressure sensor connection to transmit pressure from the first pressure-monitoring line to the first pressure sensor connection,
the second pressure-monitoring line having a second length and being connectable to the second pressure sensor connection to transmit pressure from the second pressure-monitoring line to the second pressure sensor connection,
the first and second pressure sensor connections being positioned on the extracorporeal blood treatment machine in a spaced arrangement,
the first length of the first pressure-monitoring line and the spaced arrangement of the first and second pressure sensor connections being configured so that the first pressure-monitoring line is attachable only to the first pressure sensor connection when the tube set is mounted to the extracorporeal blood treatment machine in the predefined arrangement, and
the second length of the second pressure-monitoring line and the spaced arrangement of the first and second pressure sensor connections being configured so that the second pressure-monitoring line is attachable only to the second pressure sensor connection when the tube set is mounted to the extracorporeal blood treatment machine in the predefined arrangement; and
wherein the first branch is attached at a first connection point to a first tube section of the tube set, and extends from the first connection point away from the first tube section at a predetermined angle relative to the first tube section so that, when the tube set is mounted in the predefined arrangement on the connection mask, the first branch is oriented to extend from the first connection point toward the first pressure sensor connection.
2. The system according to claim 1 , wherein the at least two pressure sensor connections comprises the first pressure sensor connection, the second pressure sensor connection and a third pressure sensor connection.
3. The system according to claim 2 , wherein the first pressure sensor connection is an arterial pressure sensor connection, the second pressure sensor connection is a blood treatment device inlet-side pressure sensor connection, and the third pressure sensor connection is a venous pressure sensor connection.
4. The system according to claim 2 , wherein the first pressure sensor connection, the second pressure sensor connection and the third pressure sensor connection are spaced apart from one another and distributed in a triangular arrangement on the connection mask.
5. The system according to claim 1 , wherein one of the at least two pressure sensor connections is arranged to be lower in a vertical direction than another of the at least two pressure sensor connections.
6. The system according to claim 5 , wherein said one of the at least two pressure sensor connections is arranged to be lower in the vertical direction than the conveying device.
7. The system according to claim 1 , wherein the at least two pressure sensor connections are configured as first connectors arranged to be connected to second connectors provided on the at least two pressure-monitoring lines.
8. The system according to claim 1 , wherein the first branch is located upstream of the pump section in a conveying direction, the first pressure sensor connection comprises an arterial pressure sensor connection, the second branch is located between the pump section and a connector piece for connecting the blood supply line to an inlet of the blood treatment device, and the second pressure sensor connection comprises a blood treatment device inlet-side pressure sensor connection.
9. The system according to claim 1 , wherein the blood return line includes, between a connector piece for connection to an outlet of the blood treatment device and an air trap, a venous branch from which a venous pressure-monitoring line branches off which can be connected to a venous pressure sensor connection of the extracorporeal blood treatment machine.
10. The system according to claim 1 , wherein at least one of the first branch and the second branch is configured as a separate branching element comprising a pressure oscillating diaphragm fluidically sealing said at least one of the first branch and the second branch.
11. The system according to claim 1 , wherein the first and second pressure-monitoring lines include connectors designed to be connected to the first and second pressure sensor connections.
12. The system according to claim 1 , wherein:
the at least two pressure sensor connections further comprises a third pressure sensor connection, the third pressure sensor connection being positioned on the extracorporeal blood treatment machine in a spaced arrangement with respect to the first pressure sensor connection and the second pressure sensor connection;
at least two pressure-monitoring lines further comprises a third pressure-monitoring line branching off the blood supply line or the blood return line at a third branch;
the third pressure-monitoring line having a third length and being connectable to the third pressure sensor connection to transmit pressure from the third pressure-monitoring line to the third pressure sensor connection;
the third length of the third pressure-monitoring line and the spaced arrangement of the first pressure sensor connection, the second pressure sensor connection and the third pressure sensor connection being configured so that the third pressure-monitoring line is attachable only to the third pressure sensor connection when the tube set is mounted to the extracorporeal blood treatment machine in the predefined arrangement.
13. The system according to claim 1 , wherein the first branch is oriented at an angle of ±45° towards the first pressure sensor connection.
14. The system according to claim 1 , wherein the first branch is oriented at an angle of ±15° towards the first pressure sensor connection.
15. The system according to claim 1 , wherein the first branch comprises a connector extending from a housing forming a portion of the tube set.
16. The system according to claim 15 , wherein the housing comprises a pressure oscillating diaphragm.
17. The system according to claim 1 , wherein the second branch is attached at a second connection point to a second tube section of the tube set, and extends from the second connection point away from the second tube section at a predetermined angle relative to the second tube section so that, when the tube set is mounted in the predefined arrangement on the connection mask, the second branch is oriented to extend from the second connection point toward the second pressure sensor connection.
18. The system according to claim 17 , wherein the first branch extends from the blood supply line, and the second branch extends from the blood supply line.
19. The system according to claim 17 , wherein the first branch extends from the blood supply line, and the second branch extends from the blood return line.