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CA-3053052-C - EXTRACORPOREAL BLOOD TREATMENT DEVICE WITH A DISINFECTING MODE

CA3053052CCA 3053052 CCA3053052 CCA 3053052CCA-3053052-C

Abstract

An extracorporeal blood treatment device comprising a hydraulic system comprising a plurality of flow paths, and a control unit providing an operating mode for disinfecting the hydraulic system with a liquid supplied via one of the flow paths is disclosed. The hydraulic system has a valve device providing several switching positions. The valve device has an inlet for the disinfecting liquid and a plurality of outlets. In a switching position the inlet is connected to one of the outlets and in another switching position the inlet is connected to a plurality of outlets. The inlet of the valve device is in fluid communication with the flow path via which the disinfecting liquid can be supplied, and the outlets of the valve device are in fluid communication with another flow path of the hydraulic system, so that liquid can simultaneously be supplied to the individual flow paths.

Inventors

  • Tobias Irrgang

Assignees

  • FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH

Dates

Publication Date
20260505
Application Date
20180221
Priority Date
20170223

Claims (16)

  1. 13 CLAIMS: 1. An extracorporeal blood treatment device comprising a hydraulic system (II) comprising a plurality of flow paths, the blood treatment device comprising a control unit providing an operating mode for disinfecting the hydraulic system (II) with a liquid that can be supplied via one of the flow paths, the hydraulic system (II) comprising a multiswitch valve device having an inlet for the liquid for disinfecting the hydraulic system and a plurality of outlets, the inlet of the valve device being in fluid communication with the flow path, via which liquid for disinfecting the hydraulic system can be supplied, and the outlets of the valve device being each in fluid communication with another flow path of the hydraulic system, in a switching position of the valve device the inlet being connected to the plurality of outlets, and the hydraulic system (II) has a dialysate supply conduit leading to a dialyzer and a dialysate discharge conduit leading away from the dialyzer, wherein: one of the outlets of the plurality of outlets of the valve device is connected via a first bypass conduit to the dialysate supply conduit, and the hydraulic system (II) comprises a filter for increasing the degree of purity of dialysate, which is arranged inside one of the flow paths of the hydraulic system, wherein one of the outlets of the plurality of outlets of the valve device is connected via a second bypass conduit to a conduit leading to the filter.
  2. 2. The extracorporeal blood treatment device according to claim 1, wherein in another switching position of the valve device, the inlet is connected to none of the outlets.
  3. 3. The extracorporeal blood treatment device according to claim 1, wherein in another switching position of the valve device, the inlet is connected to one of the outlets. 85438404 14
  4. 4. The extracorporeal blood treatment device according to any one of claims 1 to 3, wherein the blood treatment device comprises a hot disinfection device with a heating unit for heating the liquid for disinfecting the hydraulic system (II) for hot disinfection, wherein the flow path through which the liquid for disinfecting the hydraulic system can be supplied, is in fluid communication with the hot disinfection device.
  5. 5. The extracorporeal blood treatment device according to any one of claims 1 to 4, wherein the blood treatment device has a connection for the supply of the liquid for disinfecting the hydraulic system (II), with which connection the flow path, via which the liquid for disinfecting the hydraulic system (II) can be supplied, is in fluid communication.
  6. 6. The extracorporeal blood treatment device according to any one of claims 1 to 5, wherein the inlet of the valve device is in fluid communication with the dialysate supply conduit leading to the dialyzer.
  7. 7. The extracorporeal blood treatment device according to claim 6, wherein the dialyzer has an inlet for supplying dialysate and an outlet for discharging dialysate, wherein the dialysate supply conduit has a connector for connecting to the inlet of the dialyzer and the dialysate discharge conduit has a connector for connecting to the outlet of the dialyzer, so that the dialyzer is separable from the hydraulic system (II) for disinfection.
  8. 8. The extracorporeal blood treatment device according to claim 7, wherein the valve device is switched inside the dialysate supply conduit.
  9. 9. The extracorporeal blood treatment device according to any one of claims 1 to 8, wherein the valve device is designed such that the valve device can be actuated by the control unit.
  10. 10. The extracorporeal blood treatment device according to any one of claims 1 to 9, wherein the control unit is configured such that in the operating mode for disinfecting the 85438404 hydraulic system (II) the valve device is switched to the switching position in which the inlet is connected to the plurality of outlets.
  11. 11. The extracorporeal blood treatment device according to claim 2, wherein the control unit provides an operating mode for performing blood treatment, wherein the control unit is configured such that in the operating mode for blood treatment, the valve device is switched to the switching position, in which the inlet is not connected to any of the outlets.
  12. 12. The extracorporeal blood treatment device according to any one of claims 1 to 11, wherein the valve device comprises a hollow cylindrical housing body in which a cylindrical valve body is rotatably arranged, wherein the inlet and the outlets are bores in the housing body, and in the valve body passages connecting the inlet to the outlets are provided.
  13. 13. The extracorporeal blood treatment device according to claim 12, wherein for rotating the valve body an electromagnetic or pneumatic actuator is provided.
  14. 14. The extracorporeal blood treatment device according to claim 12, wherein for rotating the valve body an electromotive actuator is provided.
  15. 15. A method for operating an extracorporeal blood treatment device having a multiflow hydraulic system (II) which comprises a plurality of flow paths, the method comprising the step of providing, in an operating mode for a hot disinfection of the hydraulic system, a liquid heated to a predetermined temperature at a central location being simultaneously supplied from the central location via bypass conduits to the plurality of flow paths, one of the flow paths of the plurality of flow paths, which is supplied with the liquid heated to the predetermined temperature via a first bypass conduit of the bypass conduits, being a flow path leading to a dialyzer, and 85438404 16 one of the flow paths of the plurality of flow paths, which is supplied with the liquid heated to the predetermined temperature via a second bypass conduit of the bypass conduits being a flow path leading to a filter for increasing the degree of purity of dialysate.
  16. 16. The method according to claim 15, wherein pure water is used as the liquid for hot disinfection.

Description

I EXTRACORPOREAL BLOOD TREATMENT DEVICE WITH A DISINFECTING MODE The invention relates to an extracorporeal blood treatment device having a hydraulic system comprising a plurality of flow paths, the blood treatment device having a control unit which provides an operating mode for disinfecting the hydraulic system with a liquid that can be supplied via one of the flow paths. Moreover, the invention relates to a method for operating an extracorporeal blood treatment device with a hydraulic system comprising a plurality of flow paths. During dialysis, the blood to be treated flows in an extracorporeal blood circuit through the blood chamber of a dialyzer divided by a semi-permeable membrane into the blood chamber and a dialysate chamber, while dialysate flows through the dialysate chamber of the dialyzer. The extracorporeal blood circuit comprises a blood supply conduit, which leads to the blood chamber, and a blood discharge conduit, which leads away from the blood chamber. The hydraulic system of the extracorporeal blood treatment device comprises a plurality of assemblies for the preparation and balancing of the dialysate, which in turn may have several components. The individual components of the hydraulic system are in fluid communication via a plurality of flow paths. The individual flow paths can have one or more conduits. The dialyzer, for example, is supplied with fresh dialysate via a dialysate supply conduit and used dialysate is removed via a dialysate discharge conduit of the dialyzer. Pumps are provided for conveying the liquids. The individual components of the blood treatment device are controlled by means of a control unit. The dialysate can be produced in the dialysis machine from permeate (pure water) and one or more concentrates. The dialysis machines have a water connection for supplying the permeate. For the disinfection of the hydraulic system of the blood treatment devices, hot disinfection becomes more important in order to reduce the use of chemicals. In hot disinfection, pure water (permeate) heated to a temperature greater than 80°C is supplied to the hydraulic system. During the hot disinfection, the heated permeate circulates in the flow paths of the Date re9ue/Date recieved 2024-05-01 2 hydraulic system. For a sufficient disinfection, it is cru.cial that the temperature of the permeate in all flow paths of the hydraulic system does not fall below the predetermined temperature of the permeate. Blood treatment devices with a device for hot disinfection are known from US 6,153,102 and EP 0 208 090 Al. The heated permeate is supplied via one of the flow paths of the hydraulic system. Then the permeate spreads in the other flow paths. In practice, it has been shown that in a central supply of the heated permeate via one of the flow paths, the permeate in individual flow paths, which are farther away from the central supply, is cooled down to a temperature which is below the temperature which the permeate has in individual flow paths, which are not as far away from the central supply. Indeed, the cooling down of the disinfecting liquid can be compensated by longer disinfection times or the addition of chemicals. However, longer disinfection times lead to higher energy consumption and the addition of chemicals leads to a higher consumption of chemicals. The invention has for its object to provide an extracorporeal blood treatment device which does not give rise to the risk that the temperature required for hot disinfection is not reached when hot disinfection is carried out even if disinfection times are shortened and/ or no or only few chemicals are added. In addition, the invention has for its object to provide a method for operating an extracorporeal blood treatment device that allows for a hot disinfection without the risk of falling below the temperature required for hot disinfection even with shorter disinfection times and/or little or no addition of chemicals. Another object of the invention is to shorten the disinfection times and/or to reduce the energy consumption and/or the consumption of chemicals. Date re9ue/Date recieved 2024-05-01 3 The blood treatment device according to the invention is characterized in that the hydraulic system has a valve device providing several switching positions. The valve device has an inlet for the liquid for disinfecting the hydraulic system and a plurality of outlets. In a switching position, the inlet is connected to a plurality of outlets. In another switching position, the inlet may not be connected to any of the outlets or to one of the outlets. In this context, a plurality of outlets is understood to mean a plurality of outlets, which comprises at least two outlets. For example, the valve device may be formed as a multi-way valve having an inlet and two or three outlets. The valve device can also comprise more than one inlet if the valve device is to be supplied with liquid via a plurality of conduits. The hydraulic system may also includ