Method and apparatus for determining pressure and detecting occlusions in a syringe pump
First Claim
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1. A method of determining the pressure in a syringe used in a syringe pump comprising the steps of:
- measuring the force on the plunger of the syringe;
subtracting a predetermined frictional force (Ff) in the syringe from the measured force to produce a scaled force;
multiplying the scaled force by a correction factor dependent on a predetermined calibration pressure (Pc), the predetermined frictional force (Ff) and a predetermined calibration force (Fc).
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Abstract
A syringe pump is disclosed in which the pressure in the syringe is monitored. The syringe pump includes a force detector which detects the force on the plunger of the syringe. The force on the plunger of the syringe is converted into a force by means of an algorithm which is independent of the cross-sectional area of the syringe. The algorithm calculates the pressure by subtracting a predetermined frictional force from the measurement force and multiplying the result by a calibration pressure divided by the difference between a calibration force and the predetermined frictional force.
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Citations
8 Claims
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1. A method of determining the pressure in a syringe used in a syringe pump comprising the steps of:
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measuring the force on the plunger of the syringe; subtracting a predetermined frictional force (Ff) in the syringe from the measured force to produce a scaled force; multiplying the scaled force by a correction factor dependent on a predetermined calibration pressure (Pc), the predetermined frictional force (Ff) and a predetermined calibration force (Fc). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A syringe pump for pumping fluid from a syringe having a plunger, a stopper and a wall, the syringe pump comprising:
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means for detecting the force on the plunger; means for converting the force into a calculated pressure using an algorithm; means for storing predetermined pressure values; means for comparing the calculated pressure with a predetermined pressure value; means for informing a user if the calculated pressure exceeds the predetermined value with which the calculated pressure was compared; wherein the algorithm calculates the calculated pressure by subtracting a frictional force from the detected force, multiplying result by a calibration pressure divided by the difference between a calibration force and the frictional force.
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Specification