MEDICAL FLUID CIRCUIT COMPRISING A LOW LEVEL DETECTOR 1
6 Assignments
0 Petitions
Accused Products
Abstract
In an infusion circuit (1), a peristaltic pump (7) displaced the infusion fluid along a line (3), sourcing it from a batch container (2). When a weight sensor (5) detects an emptying of the batch container (2), the pump is halted. If on stopping the pump the pressure measured by a sensor (6) operating in an expansion chamber (4) does not drop in excess of a predetermined threshold with respect to a non-empty container (2), a non-secure situation is signalled, due to an excessive quantity of air in the expansion chamber.
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Citations
50 Claims
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1-32. -32. (canceled)
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33. An extracorporeal blood treatment apparatus, comprising:
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a membrane exchanger for an extracorporeal blood treatment comprising a blood chamber and a fluid chamber, separated from one another by a semipermeable membrane; an extracorporeal blood circuit connected to the blood chamber; a medical fluid circuit configured for infusing the medical fluid in the blood circuit or in the fluid chamber, the medical fluid circuit comprising; a batch container for a medical fluid; a fluid supply line connected to the batch container for supplying the medical fluid; an expansion chamber arranged along the supply line; a first sensor configured to send at least a first signal indicating an emptying of the batch container; a second sensor configured to send at least a second signal indicating a parameter in the expansion chamber, wherein the parameter is selected from a group of parameters which includes a pressure in the expansion chamber and a liquid level in the expansion chamber; a control unit configured to perform a control procedure of a situation in the expansion chamber, the control procedure comprising following operations; detecting a situation of emptying of the batch container from the first signal; detecting at least a value of said parameter inside the expansion chamber during the emptying situation; performing a control on whether the at least a value of the parameter is in a determined relation with at least a reference value; recognising a faulty situation in the expansion chamber based on said control. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. An extracorporeal blood treatment apparatus, comprising:
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a membrane exchanger for an extracorporeal blood treatment comprising a blood chamber and a fluid chamber, separated from one another by a semipermeable membrane; an extracorporeal blood circuit connected to the blood chamber; a medical fluid circuit configured for infusing the medical fluid in the blood circuit or in the fluid chamber, the medical fluid circuit comprising; a batch container for a medical fluid; a fluid supply line connected to the batch container for supplying the medical fluid; a pump to move fluid on the fluid supply line; an expansion chamber arranged along the supply line; a first sensor configured to send at least a weight signal indicating an emptying of the batch container; a second sensor configured to send at least a pressure signal indicating a pressure in the expansion chamber; a control unit configured to perform a control procedure of a situation in the expansion chamber, the control procedure comprising following operations; detecting when the container is completely emptied of liquid or almost emptied by detecting that the weight reading provided by the first sensor is no longer dropping, stopping the pump, examining a pressure progression provided by the second sensor up until halting the pump, and taking this progression as indicative of the quantity of liquid present in the chamber, recognising a faulty situation in the expansion chamber based on said examining. - View Dependent Claims (48, 49, 50)
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Specification