Circuit for connecting a protective conductor to at least two liquid-conveying lines and method for checking a protective conductor connection

Patent metadata

Field	Value
Publication number	US-11413382-B2
Application number	US-201816755888-A
Country	US
Kind code	B2
Filing date	Oct 15, 2018
Priority date	Oct 19, 2017
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

The invention relates to a circuit arrangement for a protective-conductor connection to at least two fluid-conducting lines 11, 12, in particular to at least two fluid-conducting lines which are guided outwards from the interior of a housing 1 of a medico-technical device, in particular the housing of a blood treatment device. The circuit arrangement comprises a plurality of protection apparatuses 16A, 16B; 17A, 17B for electrical contacting which are designed such that an electrical connection to a fluid in the line can be produced using each protection apparatus for electrical contacting. In the circuit arrangement, at least two protection apparatuses 16A, 16B; 17A, 17B for electrical contacting are assigned to each fluid-conducting line 11, 12. As a result, two protective measures are taken for each fluid-conducting line. In addition, the protection apparatuses 16A, 16B; 17A, 17B of one fluid-conducting line 11; 12 are each electrically connected to another protection apparatus 16A, 16B; 17A, 17B of another fluid-conducting line 11; 12. The protective-conductor concept according to the invention improves safety for the patient and makes it possible to test the protective-conductor connection in a simple manner.

First claim

The invention claimed is:

1. Circuit arrangement for a protective-conductor connection to at least two fluid-conducting lines the circuit arrangement comprising a plurality of protection apparatuses for electrical contacting which are designed such that an electrical connection to a fluid in the line can be produced using each protection apparatus for electrical contacting,
wherein
at least two protection apparatuses for electrical contacting are assigned to each fluid-conducting line, and
the at least two protection apparatuses for electrically contacting a fluid-conducting line are each electrically connected to another protection apparatus for electrically contacting another fluid-conducting line.

2. Circuit arrangement according to claim 1 , wherein, out of the at least two protection apparatuses for electrical contacting assigned to each fluid-conducting line, at least one protection apparatus for electrical contacting is assigned to a line portion of the fluid-conducting line that is inside the housing and at least one protection apparatus for electrical contacting is assigned to a line portion of the fluid-conducting line that is outside the housing, at least in part.

3. Circuit arrangement according to claim 2 , wherein a protection apparatus for electrically contacting a fluid-conducting line that is assigned to the line portion of one of the fluid-conducting lines that is inside the housing is electrically connected to a protection apparatus for electrically contacting another fluid-conducting line that is assigned to the line portion of the other fluid-conducting line that is outside the housing, at least in part.

4. Circuit arrangement according to claim 3 , wherein the protection apparatuses assigned to the line portion of the fluid-conducting line that is inside the housing are each connected to a protective conductor or an equipotential bonding system by means of an electrical connecting line.

5. Medico-technical device comprising a housing and at least two fluid-conducting lines, wherein the medico-technical device is a circuit arrangement according to claim 1 .

6. Medico-technical device according to claim 5 , wherein the at least two fluid-conducting lines are guided outwards from the interior of the housing.

7. Medico-technical device according to claim 5 , wherein the at least two fluid-conducting lines are part of a fluid system of the medico-technical device.

8. Medico-technical device according to claim 5 , wherein a medical fluid is located in the at least two fluid-conducting lines.

9. Medico-technical device according to claim 5 , wherein the medico-technical device comprises a first fluid-conducting line and a second fluid-conducting line, the two fluid-conducting lines forming a fluid circuit.

10. Medico-technical device according to claim 5 , wherein the medico-technical device is a blood treatment device.

11. Circuit arrangement according to claim 1 , wherein at least one protection apparatus is designed as a housing feedthrough.

12. Circuit arrangement according to claim 11 , wherein the at least one protection apparatus designed as a housing feedthrough is electrically insulated with respect to a housing made of an electrically conductive material.

13. Medico-technical device comprising a housing and at least two fluid-conducting lines, wherein the medico-technical device is a circuit arrangement according to claim 4 .

14. Medico-technical device according to claim 13 , wherein the housing consists of an electrically conductive material, the housing being electrically connected to the protective conductor or equipotential bonding system.

15. Medico-technical device according to claim 13 , wherein the housing consists of an electrically non-conductive material, an electrical measurement contact point on the housing being electrically connected to the protective conductor or equipotential bonding system, which point is accessible from the outside.

16. Medico-technical device according to claim 13 , wherein the protective conductor or equipotential bonding system is connected to the protective conductor system of a fixed electrical installation.

17. Method for testing a protective-conductor connection to at least two fluid-conducting lines that are guided outwards from the interior of a housing of a medico-technical device by means of a circuit arrangement according to claim 4 , wherein the electrical resistance between the protection apparatuses for electrical contacting that are assigned to the line portions of the fluid-conducting lines that are outside the housing, at least in part, and the protective conductor or equipotential bonding system is measured.

18. Method according to claim 17 , wherein the protective conductor or equipotential bonding system is electrically connected to a housing made of an electrically conductive material, the electrical resistance between the protection apparatuses for electrical contacting that are assigned to the line portions of the fluid-conducting lines that are outside the housing, at least in part, and the housing being measured.

19. Method according to claim 17 , wherein the protective conductor or equipotential bonding system is electrically connected to an electrical measurement contact point, which is accessible from the outside, on a housing made of an electrically non-conductive material, the electrical resistance between the protection apparatuses for electrical contacting that are assigned to the line portions of the fluid-conducting lines that are outside the housing, at least in part, and the measurement contact point being measured.

Assignees

• Fresenius Medical Care Deutschland Gmbh

Inventors

• Danz Tim
• Schmitt Thomas
• Breitkopf Berthold
• Aschenbrenner Paul
• Scheuring Oswald

Classifications

• A61M2205/70

  with testing or calibration facilities · CPC title

• A61M1/1601

  Control or regulation · CPC title

• A61M2205/16

  with back-up system in case of failure · CPC title

• A61M1/1621 Primary

  Constructional aspects thereof (semi-permeable membranes for separation processes characterised by their properties B01D69/00; semi permeable membranes characterised by their material B01D71/00) · CPC title

• A61M2209/02

  Equipment for testing the apparatus · CPC title