Air detection system and method for detecting air in a pump of an infusion system
First Claim
1. A system for detecting air in a chamber of an infusion system, the infusion system comprising a pump and a plunger moveably disposed against the chamber, the chamber configured to hold fluid, the system comprising:
- an actuator device configured to move the plunger against the chamber;
a sensor configured to detect a force acting on the plunger as it moves against the chamber; and
one or more hardware processors configured to;
determine a change in force per unit volume of the fluid at a first time during infusion;
determine the change in force per unit volume satisfies a threshold at the first time;
determine a difference between a first average force acting on the plunger prior to the first time and a second average force acting on the plunger after a delay time from the first time;
determine the difference satisfies a force differential; and
detect a presence of air in the chamber based on the determination of the difference satisfying the force differential and the determination of the change in force satisfying the threshold.
1 Assignment
0 Petitions
Accused Products
Abstract
Various systems and methods for detecting air in a chamber of an infusion system are disclosed. In one embodiment, a determination is made that air is contained in the chamber on the basis of a change in the average force exerted against the plunger utilizing a derivative spike for event detection and a systematic reduction in the average force to confirm the nature of the change. In another embodiment, a determination is made that the chamber contains air when a difference between the current force profile and a baseline force profile crosses a threshold. In an additional embodiment, a force profile is classified as being an air force profile or a liquid force profile based on extracted features of the force profile.
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Citations
16 Claims
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1. A system for detecting air in a chamber of an infusion system, the infusion system comprising a pump and a plunger moveably disposed against the chamber, the chamber configured to hold fluid, the system comprising:
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an actuator device configured to move the plunger against the chamber; a sensor configured to detect a force acting on the plunger as it moves against the chamber; and one or more hardware processors configured to; determine a change in force per unit volume of the fluid at a first time during infusion; determine the change in force per unit volume satisfies a threshold at the first time; determine a difference between a first average force acting on the plunger prior to the first time and a second average force acting on the plunger after a delay time from the first time; determine the difference satisfies a force differential; and detect a presence of air in the chamber based on the determination of the difference satisfying the force differential and the determination of the change in force satisfying the threshold. - View Dependent Claims (2, 3, 4)
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5. A system for detecting air in a chamber of an infusion system, the infusion system comprising a pump and a plunger moveably disposed against the chamber, the chamber configured to hold fluid, the system comprising one or more hardware processors configured to:
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receive a measurement of force acting on the plunger as it moves against the chamber; determine a change in force per unit volume of the fluid at a first time during infusion; determine the change in force per unit volume satisfies a threshold at the first time; determine a difference between a first average force acting on the plunger prior to the first time and a second average force acting on the plunger after a delay time from the first time; determine the difference satisfies a force differential; and detect a presence of air in the chamber based on the determination of the difference satisfying the force differential and the determination of the change in force satisfying the threshold. - View Dependent Claims (6, 7, 8)
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9. A method for detecting air in a chamber of an infusion system, the infusion system comprising a pump and a plunger moveably disposed against the chamber, the chamber configured to hold fluid, the method comprising:
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receiving a measurement of force acting on the plunger as it moves against the chamber; determining a change in force per unit volume of the fluid at a first time during infusion; determining the change in force per unit volume satisfies a threshold at the first time; determining a difference between a first average force acting on the plunger prior to the first time and a second average force acting on the plunger after a delay time from the first time; determining the difference satisfies a force differential; and detecting a presence of air in the chamber based on the determination of the difference satisfying the force differential and the determination of the change in force satisfying the threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification