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US 12,569,603 B2Granted
Method for calibrating a peristaltic pump in a medical apparatus and medical apparatus for performing this method
AssigneesBaxter International Inc., Baxter Healthcare S.A.
InventorsMauro Suffritti, Mauro Gusella
Life of this patent
Estimating the term…
Abstract
A method for calibrating a peristaltic pump in a medical apparatus comprises: rotating the peristaltic pump of a predetermined rotation to pump a liquid from a fluid source from a first compartment into a second compartment of a manifold assembly, raising a level of the liquid in the second compartment and compressing air in an air buffer volume of the manifold assembly; measuring a pressure of air in the air buffer volume; calculating, from the measured pressure, a variation of liquid volume in the second compartment due to the rotation of the peristaltic pump; calculating, from the variation of liquid volume and the predetermined rotation, a stroke liquid volume of the peristaltic pump.
Claims21
Method for calibrating a peristaltic pump in a medical apparatus, wherein the medical apparatus comprises a medical machine and a manifold assembly,
- wherein the medical machine comprises a peristaltic pump and a pressure transducer, and
- wherein the manifold assembly comprises:
- a casing delimiting internally a first compartment and a second compartment;
- a yielding pump tube having a first end connected to the first compartment and a second end connected to the second compartment, wherein the yielding pump tube extends outside the casing and is coupled to the peristaltic pump of the medical machine;
- and
- a plurality of line tubes each having a first end connected to the first compartment or to the second compartment and a second end connectable to a fluid source or to a drain or to a patient, wherein, when the manifold assembly is properly mounted on the medical machine, an upper part of the second compartment delimits an air buffer volume, the air buffer volume being in communication with the pressure transducer,
- the method comprising:
- i. rotating the peristaltic pump of a predetermined rotation to pump a liquid from the fluid source into the second compartment and raising a level of the liquid in the second compartment to compress air in the air buffer volume;
- ii. measuring pressure of air in the air buffer volume;
- iii. calculating, from the measured pressure of air in the air buffer volume, a variation of liquid volume in the second compartment due to the rotation of the peristaltic pump;
- and
- iv. calculating, from the variation of liquid volume and the predetermined rotation, a stroke liquid volume of the peristaltic pump.
9 more elements
Method for calibrating a peristaltic pump in a medical apparatus, wherein the medical apparatus comprises a medical machine and a manifold assembly,
- wherein the medical machine comprises a peristaltic pump and a pressure transducer,
- wherein the manifold assembly comprises:
- a casing delimiting internally a first compartment and a second compartment;
- a yielding pump tube having a first end connected to the first compartment and a second end connected to the second compartment, wherein the yielding pump tube extends outside the casing and is coupled to the peristaltic pump of the medical machine;
- and
- a plurality of line tubes each having a first end connected to the first compartment or to the second compartment and a second end connectable to a fluid source or to a drain or to a patient;
- wherein, when the manifold assembly is properly mounted on the medical machine, an upper part of the second compartment delimits an air buffer volume, the air buffer volume being in communication with the pressure transducer,
- the method comprising:
- i. rotating the peristaltic pump a predetermined rotation, where the predetermined rotation comprises a plurality of revolutions or fractions of revolutions such that one of a plurality of pressing elements of the peristaltic pump is in a same predetermined position at a start and at an end of the rotation to pump a liquid from the fluid source into the second compartment and raising a level of the liquid in the second compartment to compress air in the air buffer volume;
- ii. measuring an initial pressure before air compression and measuring a final pressure after air compression in the air buffer volume;
- iii. calculating, from the measured initial pressure and the measured final pressure of air in the air buffer volume, a variation of liquid volume in the second compartment due to the rotation of the peristaltic pump;
- and
- iv. calculating, from the variation of liquid volume and the predetermined rotation, a stroke liquid volume of the peristaltic pump,
- wherein calculating the stroke liquid volume through steps i. to iv. is executed consecutively a plurality of times and an average stroke liquid volume is determined.
11 more elements
Medical apparatus comprising a medical machine and a manifold assembly,
- wherein the medical machine comprises:
- a peristaltic pump having a plurality of pressing elements and an encoder to detect a position and movement of one of the plurality of pressing elements;
- a pressure transducer;
- and
- a control unit operatively connected to the peristaltic pump, the encoder, and to the pressure transducer, the control unit being configured to rotate the peristaltic pump for a plurality of revolutions or fractions of revolutions such that one of the plurality of pressing elements detected by the encoder is in a same predetermined position at a start and at an end of the rotation,
- wherein the manifold assembly comprises:
- a casing delimiting internally a first compartment and a second compartment;
- a yielding pump tube having a first end connected to the first compartment and a second end connected to the second compartment, wherein the yielding pump tube extends outside the casing and is coupled to the peristaltic pump of the medical machine;
- and
- a plurality of line tubes each having a first end connected to the first compartment or to the second compartment and a second end connected or connectable to a fluid source or to a drain or to a patient;
- wherein, when the manifold assembly is properly mounted on the medical machine, an upper part of the second compartment delimits an air buffer volume in communication with the pressure transducer,
- wherein the control unit is configured to calibrate the peristaltic pump by performing the following steps:
- rotating the peristaltic pump of a predetermined rotation to pump a liquid from the fluid source into the second compartment and raising a level of the liquid in the second compartment to compress air in the air buffer volume;
- measuring pressure of air in the air buffer volume, including measuring an initial pressure before air compression and measuring a final pressure after air compression;
- calculating, from the measured pressure of air in the air buffer volume, a variation of liquid volume in the second compartment due to the rotation of the peristaltic pump;
- and
- calculating, from the variation of liquid volume and the predetermined rotation, a stroke liquid volume of the peristaltic pump.
14 more elements
Dependencies are inferred from the claim text.