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US 9,808,567 B2Granted
Diaphragm repositioning for pressure pod using position sensing
AssigneeGambro Lundia AB
InventorJohn O'Mahony
Life of this patent
Estimating the term…
Abstract
Pressure measurement system (e.g., for an extracorporeal treatment system), method and pressure pod apparatus including a position sensor for use in repositioning a diaphragm that separates a liquid side cavity from a transducer side cavity (e.g., operatively connected to a pressure transducer); the liquid side cavity being in fluid communication with an inlet and an outlet.
Claims20
An extracorporeal treatment system including a pressure measurement system comprising:
- a pressure pod body comprising at least a pod body portion and a base body portion;
- a diaphragm separating a liquid side cavity defined at least in part by the pod body portion from a transducer side cavity defined at least in part by the base body portion, wherein the liquid side cavity is in fluid communication with an inlet and an outlet, and further wherein the diaphragm is displaceable from a centered measuring position into the liquid side cavity towards the pod body portion and is displaceable from the centered measuring position into the transducer side cavity towards the base body portion;
- a pressure transducer operatively coupled to the transducer side cavity such that pressure of liquid when present in the liquid side cavity is transferred to the transducer side cavity via the diaphragm and measureable by the pressure transducer;
- a position sensor to sense the position of the diaphragm;
- a controller operatively coupled to the position sensor to receive one or more signals representative of the position of the diaphragm and to generate a control signal based thereon for use in repositioning the diaphragm towards the centered measuring position;
- and
- pump apparatus operatively coupled to the controller and the transducer side cavity to reposition the diaphragm to the centered measuring position based on the control signal generated by the controller.
4 more elements
A pressure measurement method comprising:
- providing a pressure pod body comprising at least a pod body portion and a base body portion, wherein a diaphragm separates a liquid side cavity defined at least in part by the pod body portion from a transducer side cavity defined at least in part by the base body portion, wherein the liquid side cavity is in fluid communication with an inlet and an outlet, and further wherein the diaphragm is displaceable from a centered measuring position into the liquid side cavity towards the pod body portion and is displaceable from the centered measuring position into the transducer side cavity towards the base body portion;
- sensing pressure of a liquid in the liquid side cavity between the inlet and the outlet, wherein the pressure of liquid when present in the liquid side cavity is transferred to the transducer side cavity via the diaphragm;
- sensing the position of the diaphragm;
- generating a control signal based on the sensed position of the diaphragm;
- and
- repositioning the diaphragm towards the centered measuring position based on the control signal.
3 more elements
A pressure measurement apparatus to be operatively mounted by a connection apparatus on a system housing of an extracorporeal treatment system, wherein the system housing contains a pressure transducer therein, the pressure measurement apparatus comprising:
- a pressure pod body configured to be mounted on the system housing by the connection apparatus, wherein the pressure pod body comprises at least a pod body portion and a base body portion;
- a diaphragm separating a liquid side cavity defined at least in part by the pod body portion from a transducer side cavity defined at least in part by the base body portion, wherein the liquid side cavity is in fluid communication with an inlet and an outlet, wherein the transducer side cavity is connectable to the pressure transducer such that pressure of liquid when present in the liquid side cavity is transferred to the transducer side cavity via the diaphragm and measureable by the pressure transducer, and further wherein the diaphragm is displaceable from a centered measuring position into the liquid side cavity towards the pod body portion and is displaceable from the centered measuring position into the transducer side cavity towards the base body portion;
- and
- a position sensor positioned adjacent the base body portion usable to sense the position of the diaphragm.
1 more element
Dependencies are inferred from the claim text.