OCCLUSION DETECTION IN DELIVERY OF FLUIDS
First Claim
1. A system to detect abnormalities in delivery of a fluid comprising:
- an infusion apparatus controllable to provide a fluid flow at an infusion flow rate, wherein the infusion apparatus is further controllable to intermittently deliver a defined volume of fluid resulting in one or more perturbations in the fluid flow;
a force transducer configured to measure a perturbed force response over time resulting from each of the one or more perturbations; and
a controller configured to;
control the infusion apparatus to provide a fluid flow at an infusion flow rate and to cause one or more perturbations in the fluid flow, wherein each of the one or more perturbations in the fluid flow result in a measurable perturbed force response;
receive a force signal representative of a perturbed force response comprising at least a maximum perturbation force resulting from at least one perturbation caused in the fluid flow;
determine an integrated perturbed force response value using integration of the force signal over a perturbation time period, the integrated perturbed force response value being representative of an additional force caused by the at least one perturbation over an equilibrium force;
provide a ratio corresponding to the at least one perturbation between the integrated perturbed force response value and a normalizing value, wherein the normalizing value is based at least on the maximum perturbation force; and
determine if fluid flow is occluded based at least on the ratio corresponding to the at least one perturbation.
3 Assignments
0 Petitions
Accused Products
Abstract
A system, method or apparatus to detect abnormalities in delivery of a fluid may include an infusion apparatus that is controllable to cause one or more perturbations in a fluid flow (e.g., each of the one or more perturbations in the fluid flow may result in a measurable perturbed force response). A force signal representative of the perturbed force response may be used to determine an integrated perturbed force response value (e.g., using integration of the force signal over a perturbation time period; the integrated perturbed force response value being representative of an additional force caused by the at least one perturbation over an equilibrium force). A ratio between the integrated perturbed force response value and a normalizing value (e.g., based at least on a maximum perturbation force of the perturbed force response) may be used to determine if fluid flow is occluded.
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Citations
20 Claims
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1. A system to detect abnormalities in delivery of a fluid comprising:
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an infusion apparatus controllable to provide a fluid flow at an infusion flow rate, wherein the infusion apparatus is further controllable to intermittently deliver a defined volume of fluid resulting in one or more perturbations in the fluid flow; a force transducer configured to measure a perturbed force response over time resulting from each of the one or more perturbations; and a controller configured to; control the infusion apparatus to provide a fluid flow at an infusion flow rate and to cause one or more perturbations in the fluid flow, wherein each of the one or more perturbations in the fluid flow result in a measurable perturbed force response; receive a force signal representative of a perturbed force response comprising at least a maximum perturbation force resulting from at least one perturbation caused in the fluid flow; determine an integrated perturbed force response value using integration of the force signal over a perturbation time period, the integrated perturbed force response value being representative of an additional force caused by the at least one perturbation over an equilibrium force; provide a ratio corresponding to the at least one perturbation between the integrated perturbed force response value and a normalizing value, wherein the normalizing value is based at least on the maximum perturbation force; and determine if fluid flow is occluded based at least on the ratio corresponding to the at least one perturbation. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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2. A method to detect abnormalities in delivery of a fluid from an infusion apparatus, wherein the method comprises:
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providing a fluid flow at an infusion flow rate; intermittently delivering a defined volume of fluid causing at least one perturbation in the fluid flow, wherein the at least one perturbation in the fluid flow results in a perturbed force response over time; measuring the perturbed force response comprising at least a maximum perturbation force resulting from the at least one perturbation caused in the fluid flow and generating a force signal representative thereof; determining an integrated perturbed force response value using integration of the force signal over a perturbation time period, the integrated perturbed force response value being representative of an additional force caused by the at least one perturbation over an equilibrium force; providing a ratio corresponding to the at least one perturbation between the integrated perturbed force response value and a normalizing value, wherein the normalizing value is based at least on the maximum perturbation force; and determining if fluid flow is occluded based at least on the ratio corresponding to the at least one perturbation. - View Dependent Claims (16, 17, 18, 19)
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3. An extracorporeal blood treatment apparatus comprising:
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an extracorporeal blood circuit; a syringe pump controllable to provide a fluid flow into the extracorporeal blood circuit at an infusion flow rate, wherein the fluid flow comprises an anticoagulant, and further wherein the syringe pump further controllable to intermittently deliver a defined volume of fluid resulting in one or more perturbations in the fluid flow; a force transducer configured to measure a perturbed force response over time resulting from each of the one or more perturbations; and a controller configured to; control the syringe pump to provide a fluid flow at an infusion flow rate and to cause one or more perturbations in the fluid flow, wherein each of the one or more perturbations in the fluid flow result in a measurable perturbed force response; receive a force signal representative of a perturbed force response comprising at least a maximum perturbation force resulting from at least one perturbation caused in the fluid flow; determine an integrated perturbed force response value using integration of the force signal over a perturbation time period, the integrated perturbed force response value being representative of an additional force caused by the at least one perturbation over an equilibrium force; provide a ratio corresponding to the at least one perturbation between the integrated perturbed force response value and a normalizing value, wherein the normalizing value is based at least on the maximum perturbation force; and determine if fluid flow is occluded based at least on the ratio corresponding to the at least one perturbation. - View Dependent Claims (20)
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Specification