Apparatus that can be electrically operated via a mains voltage connection

Patent metadata

Field	Value
Publication number	US-9255956-B2
Application number	US-201113820605-A
Country	US
Kind code	B2
Filing date	Sep 2, 2011
Priority date	Sep 3, 2010
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

The present invention relates to a device operable electrically via a mains voltage connection, in particular without a ground wire connection, having a live element and having an application part, wherein the application part is insulated by a basic insulation with respect to the live element. In this respect, an insulation monitor is provided which monitors the quality of the basic insulation of the application part with respect to the live element. The present invention furthermore comprises a medical device having a heating module for heating a medical fluid, wherein the heating module comprises a heating element having a heating coil arranged on a first ceramic layer, wherein the heating element is arranged on a second ceramic layer, wherein the second ceramic layer advantageously forms a heating plate of the heating module.

First claim

The invention claimed is:

1. A device operable electrically via a mains voltage connection, the mains voltage connection providing a connection to a mains voltage power supply for downloading electrical power from the mains voltage power supply to operate the device, the device having a live element that directly receives the electrical power from the mains voltage power supply via the mains voltage connection to operate the live element, and an application part, wherein the application part is insulated by a basic insulation with respect to the live element,
characterized in that an insulation monitor is provided which monitor the quality of the basic insulation of the application part with respect to the live element, and wherein said device is at least one of a heating element or a medical device.

2. A device in accordance with claim 1 , wherein the device is a medical device.

3. A device in accordance with claim 2 , wherein the device is a dialysis machine.

4. A device in accordance with claim 1 , wherein the insulation monitor determines a current flow and/or a resistance between the live element and the application part by active measurement.

5. A device in accordance with claim 4 , wherein the insulation monitor determines the current flow and/or the resistance between the application part and a first voltage feed of the live element and also between the application part and a second voltage feed of the live element.

6. A device in accordance with claim 1 , wherein the live element is operated without a galvanic isolation at the mains voltage.

7. A device in accordance with claim 1 , wherein the insulation monitor switches the power supply of the live element off when it recognizes a defective basic insulation.

8. A device in accordance with claim 1 , wherein the device controller has a function for testing the insulation monitor.

9. A device in accordance with claim 8 , wherein the function for testing the proper function of the insulation monitor comprises an initializing test.

10. A device in accordance with claim 1 , wherein the live element is a heating element.

11. A device in accordance with claim 1 , wherein the application part is a housing element.

12. A method for operating an electrical device as claimed in claim 1 via a mains voltage connection, wherein the device has a live element and an application part, wherein the application part is insulated from the live element by a basic insulation, characterized in that the quality of the basic insulation of the application part is monitored with respect to the live element.

13. A device in accordance with claim 1 , wherein the device does not have a ground wire connection.

14. A device in accordance with claim 1 , wherein the application part is a heating plate.

15. A dialysis machine operable electrically via a mains voltage connection, the mains voltage connection providing a connection to a mains voltage power supply for downloading electrical power from the mains voltage power supply to operate the dialysis machine, the dialysis machine having a heating element that directly receives the electrical power from the mains voltage power supply via the mains voltage connection to operate the heating element, and a heating plate, wherein the heating plate is insulated by a basic insulation with respect to the heating element, characterized in that an insulation monitor is provided which monitors the quality of the basic insulation of the heating plate with respect to the heating element.

16. A medical device free of any ground wire connection and comprising,
a mains voltage input connected to provide mains voltage directly to a live element of the medical device, said live element being ungrounded and free of any galvanic isolation with respect to said mains voltage,
said medical device further comprising an ungrounded application part contactable by a user of the medical device, and an ungrounded basic insulation for electrically isolating the application part from the live element and thus preventing electric shock to the user, and
an insulation monitor to monitor the quality of the basic insulation by determining a current flow and/or resistance between the live element and application part and to switch off the mains voltage being supplied to the live element when the insulation is recognized as defective.

17. The medical device of claim 16 , wherein the medical device is a dialysis machine, the live element is a heating element, and the application part is a heating plate.

Assignees

• Sebesta Sven
• Wernicke Ulrich
• Fresenius Medical Care De Gmbh

Inventors

• Sebesta Sven
• Wernicke Ulrich

Classifications

• H05B2203/017

  Manufacturing methods or apparatus for heaters · CPC title

• H05B2203/021

  Heaters specially adapted for heating liquids · CPC title

• A61M2205/3653

  by Joule effect, i.e. electric resistance · CPC title

• A61M2205/3368

  Temperature · CPC title

• G01R35/00

  Testing or calibrating of apparatus covered by the other groups of this subclass · CPC title