Method and device for checking proper replacement of a used filter in a device for extracorporeal treatment of blood
AssigneeFresenius Medical Care Deutschland GmbH
InventorHelge Brauer
Life of this patent
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Abstract
A method and a device for verifying the proper replacement of a used filter that is divided into two chambers by a membrane in a device for extracorporeal treatment of blood. The verification of whether the filter has been properly replaced with a new filter is performed by a pressure retaining test, which determines whether the membrane of the filter is permeable to gas. In the event the membrane is permeable to gas, it is concluded that the used filter has been replaced by a new filter.
Claims13
A method for determining if a filter in the fluid system of a device for extracorporeal treatment of blood has been replaced with a new filter, comprising:
- measuring whether a membrane of the filter that divides the filter into a first and second chamber is permeable to gas prior to the membrane having been wetted with fluid assuming the filter to be a new filter;
- and
- if the membrane is permeable to gas concluding that the filter is dry and has been replaced, otherwise concluding that the filter is wet and has not been replaced.
A device for extracorporeal treatment of blood, comprising:
- at least one filter divided by a membrane into a first chamber and a second chamber, disposed in a fluid system of the device;
- means for measuring a gas permeability of the membrane of the at least one filter;
- and
- means for determining whether the at least one filter has been replaced or has not been replaced by a corresponding new filter based on the gas permeability of the membrane comprising a verification of whether the membrane has been wetted with fluid.
A device for extracorporeal treatment of blood, comprising:
- a filter divided by a membrane into a first and a second chamber;
- a device for introducing or withdrawing gas from one side of the membrane;
- an analyzing unit constructed and arranged to compare a change in pressure in the filter with a predetermined value;
- and
- an indicator to indicate if the change in pressure exceeds the predetermined value and determine whether the filter is dry the analyzing unit triggering at least one of an alarm or a control action upon a determination that the filter is not dry.
Dependencies are inferred from the claim text.