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EP-4740979-A2 - INFUSION PUMP FLOW RATE CONTROL

EP4740979A2EP 4740979 A2EP4740979 A2EP 4740979A2EP-4740979-A2

Abstract

Methods and systems for infusing a user. An infusion pump includes a housing with an elastic component configured to expand and store potential energy. The infusion pump includes a first tube fluidically coupled to an outlet of the housing. The first tube is configured to conduct the fluid from the housing at a first flow rate. The infusion pump includes an air filter fluidically coupled to a distal end of the first tube via an air filter inlet. The infusion pump includes a second tube fluidically coupled to the air filter via an air filter outlet. The second tube is configured to adjust the first flow rate of the fluid conducted from the housing to a second flow rate. The infusion pump further includes one or more components for distributing the fluid to a user, the one or more components fluidically coupled to an outlet of the second tube.

Inventors

  • FRANKS, Brett

Assignees

  • CareFusion 303, Inc.

Dates

Publication Date
20260513
Application Date
20210520

Claims (16)

  1. An infusion pump comprising: a housing including an elastic component configured to expand and store potential energy generated by a fluid within the infusion pump, a first tube fluidically coupled to an outlet of the housing, the first tube configured to conduct the fluid from the housing at a first flow rate based, in part, on the potential energy stored by the elastic component; a controller chip configured to operate a valve to control the first flow rate of the fluid; an air filter fluidically coupled to a distal end of the first tube via an air filter inlet, the air filter configured to expel air from the fluid via one or more air vents, wherein the air is expelled substantially upstream such that the fluid exiting the air filter is primed without air; and a second tube fluidically coupled to the air filter via an air filter outlet, wherein the second tube is configured to adjust the first flow rate of the fluid conducted from the housing, via the first tube, to a second flow rate, the second flow rate based, at least in part, on an inner diameter of the second tube, and an outlet of the second tube is configured to fluidically couple to one or more components for distributing the fluid to a user.
  2. The infusion pump of Claim 1, wherein the inner diameter of the second tube is no greater than 0.0075 inches.
  3. The infusion pump of Claim 2, wherein the second tube is a predetermined length, and the second flow rate is further based on the predetermined length.
  4. The infusion pump of any of Claims 1-3, wherein an inner diameter of the first tube and the inner diameter of the second tube are distinct.
  5. The infusion pump of any of Claims 1-4, further comprising a flow restrictor component within the first tube, wherein the flow restrictor component has a diameter less than an inner diameter of the first tube.
  6. The infusion pump of Claim 5, wherein the flow restrictor component is a pin configured to change a shape of the fluid from a cylindrical shape to a torus shape, wherein the pin has a predetermined radius, and the first flow rate is further based, in part, on the predetermined radius of the pin.
  7. The infusion pump of Claim 5, wherein the flow restrictor component is a pin configured to change a shape of the fluid from a cylindrical shape to a torus shape, wherein the pin has a predetermined length, and the first flow rate is further based, in part, on the predetermined length of the pin.
  8. The infusion pump of Claim 5, wherein the flow restrictor component is unfixed within the first tube and configured to move a length of the first tube.
  9. The infusion pump of any of Claims 1-8, wherein the air filter includes a membrane filter that is configured to remove one or more contaminants and particulates from the fluid.
  10. The infusion pump of any of Claims 1-9, further comprising an external flow restrictor coupled to an exterior potion of the first tube, the external flow restrictor configured to provide or remove an external pressure to the first tube that respectively close or open a fluid passageway of the first tube.
  11. The infusion pump of any of Claims 1-10, wherein: the elastic component is formed of a single layer membrane; and the housing includes an inlet for receiving the fluid, the fluid received via the inlet expanding the elastic component and generating the potential energy stored by the elastic component.
  12. The infusion pump of Claim 11, wherein the single layer membrane is an elastomeric membrane.
  13. The infusion pump of any of Claims 1-12, wherein: the housing includes: a first portion that includes a first and second surface, wherein the first surface includes the outlet of the housing for distributing the fluid, and the second surface, opposite the first surface, includes the elastic component coupled between a first ring and a second ring affixed the second surface; and a second portion that is configured to house the second surface of the first portion, wherein the first portion and the second portion are coupled.
  14. A method of infusing fluid to a patient, the method comprising: at an infusion pump comprising: a housing including an elastic component; a first tube fluidically coupled to the housing via an outlet of the housing, an air filter fluidically coupled to a distal end of the first tube via an air filter inlet, a second tube fluidically coupled to the air filter via an air filter outlet, an outlet of the second tube fluidically coupled to one or more components; and a controller chip configured to operate a valve to control a first flow rate of the fluid; expanding the elastic component with the fluid to store potential energy generated by the fluid within the infusion pump; conducting, through the first tube, the fluid from the housing at the first flow rate based, in part, on the potential energy stored by the elastic component; expelling air from the fluid via one or more air vents of the air filter, wherein the air is expelled substantially upstream such that the fluid exiting the air filter is primed without air; adjusting the first flow rate of the fluid conducted from the housing, via the first tube, to a second flow rate, the second flow rate based, at least in part, on an inner diameter of the second tube; and distributing the fluid to a user via the one or more components.
  15. The method of Claim 14, wherein the first tube comprises a flow restrictor component within the first tube in the form of a pin having a diameter less than an inner diameter of the first tube, wherein conducting the fluid through the first tube comprises the pin changing the shape of the fluid from a cylindrical shape to a torus shape and setting the first flow rate based, in part, on a predetermined radius or a predetermined length of the pin.
  16. The method of Claim 15, wherein the flow restrictor component is unfixed within the first tube and wherein conducting the fluid through the first tube comprises flow restrictor freely moving along a length of the first tube.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Provisional Application Serial No. 63/030,232, entitled " INFUSION PUMP FLOW RATE CONTROL," filed on May 26, 2020, the entirety of which is incorporated herein by reference. Technical Field The present disclosure pertains to fluid pumps. More particularly, portable infusion pumps which are useful for pumping relatively small amounts of fluids under substantially constant pressure at accurate and constant flow rates over a sustained period of time. The present invention is particularly, but not exclusively, useful for a one-time use as a disposable pump for infusing fluid medicaments to an ambulatory patient. BACKGROUND Disposable pumps (also called elastomeric pumps, ambulatory pumps or CADD pumps) have been around for some time. These disposable pumps offer distinct low-cost care advantages and are used in a variety of applications from antibiotic administration, pain management, up to and including chemotherapy administration. Alternate site care (e.g., at home or in mass oncology clinics) is also becoming more common. Given the rising costs of healthcare, more non-acute options are needed. Disposable pumps are able to provide users with a cost effective way meet their healthcare needs. However, current disposable pumps are not always able to provide accurate and consistent flow rates to infuse fluid medicament to a user. Hence, those skilled in the art have recognized a need for disposable pumps that are able to provide users with fluid medicament at an accurate and constant flow rate. Yet a further identified need is for a flow restrictor that can be manufactured more cost effectively and can use interchangeable parts with restrictors of differing sizes. The invention fulfills these needs and others. SUMMARY In some implementations, an infusion pump includes a housing. The housing includes an elastic component configured to expand and store potential energy generated by the fluid within the infusion pump. The infusion pump includes a first tube fluidically coupled to an outlet of the housing. The first tube is configured to conduct the fluid from the housing at a first flow rate based, in part, on the potential energy stored by the elastic component. The infusion pump includes an air filter fluidically coupled to a distal end of the first tube via an air filter inlet. The air filter configured to expel air from the fluid, via one or more air vents, substantially upstream such that the fluid exiting the air filter is primed without air. The infusion pump includes a second tube fluidically coupled to the air filter via an air filter outlet that is configured to adjust the first flow rate of the fluid conducted from the housing, via the first tube, to a second flow rate. The second flow rate is based, at least in part, on an inner diameter of the second tub. The infusion pump further includes an outlet of the second tube fluidically coupled to one or more components for distributing the fluid to a user. In some implementations, a method of infusing fluid to a patient is performed at an infusion pump. The infusion pump includes a housing that includes an elastic component, a first tube fluidically coupled to the housing, via an outlet of the housing, an air filter fluidically coupled to a distal end of the first tube via an air filter inlet, a second tube fluidically coupled to the air filter via an air filter outlet, and an outlet of the second tube fluidically coupled to one or more components. In some implementations, the method performed at the infusion pump includes expanding the elastic component with the fluid to store potential energy generated by the fluid within the infusion pump; conducting, from the first tube, fluid from the housing at a first flow rate based, in part, on the potential energy stored by the elastic component; expelling air from the fluid via the one or more air vents of the air filter, where the air is expelled substantially upstream such that the fluid exiting the air filter is primed without air; adjusting the first flow rate of the fluid conducted from the housing, via the first tube, to a second flow rate, the second flow rate based, at least in part, on an inner diameter of the second tube; and distributing the fluid to a user via the one or more components coupled to the outlet of the second tube. BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the various described implementations, reference should be made to the Description of Implementations below, in conjunction with the following drawings. Like reference numerals refer to corresponding parts throughout the figures and description. Figure 1 illustrates a disposable infusion pump, in accordance with some implementations.Figure 2 illustrates a disposable infusion pump, in accordance with some implementations.Figure 3 is an overview of the disposable pump system, in accordance with some implementations.Figures 4A and 4B ill