Infusion pump with independently controllable valves and low power operation and methods thereof

• US 9,144,644 B2
• Filed: 08/02/2011
• Issued: 09/29/2015
• Est. Priority Date: 08/02/2011
• Status: Active Grant

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Inventors: Hungerford, Roger L., Bui, Tuan
• Primary Examiner(s): Sirmons, Kevin C
• Assistant Examiner(s): Hall, Deanna K
• Application Number:
  US13/196,136
• Publication Number:
  US 20130035659A1
• Time in Patent Office: 1,519 Days
• Field of Search: 604/118
• US Class Current: 1/1
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 5/14 Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
• CPC Class Codes: A61M 5/16813 by controlling the degree of opening of the flow line
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: F04B 43/082 the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04B 49/22 by means of valves F04B49/03 takes precedence

Abstract

An infusion pump, including: a specially programmed microprocessor; a drip chamber for connection to a source of fluid and to an output tubing; a pumping section including a plurality of fingers and a first actuator, controllable using the microprocessor, for sequentially displacing the plurality of finger to compress a first portion of the output tubing to displace fluid from the drip chamber through the output tubing; an inlet valve disposed between the drip chamber and the pumping section and arranged to compress the output tubing to restrict or block flow through the output tubing; and a second actuator, controllable using the microprocessor, for opening or closing the inlet valve independent of the displacement of the plurality of fingers; or for operating the inlet valve to control a rate of flow of fluid from the drip chamber to the portion of the output tubing.

Claims

1. An infusion pump for controlling a flow condition of a source of fluid and delivered to a user through an output tubing, the pump comprising:

a computer processor;

a first actuator configured for displacing at least one finger for compressing a first portion of the output tubing to deliver the source of fluid to the user;

a second actuator configured for selectively operating an inlet valve of the infusion pump to control the flow condition of the source of fluid to the first portion of the output tubing; and

an outlet valve is disposed downstream of the first portion of the output tubing, and the output tubing includes a second portion between the inlet and outlet valves, said outlet valve being controlled by said first actuator,

wherein, using the processor, the first actuator controls the displacement of the at least one finger and the operation of said outlet valve independently from the inlet valve, and the second actuator controls the operation of the inlet valve independently from the at least one finger.

2. The infusion pump of claim 1, wherein the source of fluid is connected to a drip chamber, the inlet valve is disposed between the drip chamber and the first portion of the output tubing, and is arranged for compressing the output tubing to control the flow condition of the source of fluid through the output tubing.

3. The infusion pump of claim 1, wherein said fingers are constructed and arranged to generate a pumping action by compressing the first portion of the outlet tubing.

4. The infusion pump of claim 1, wherein the source of fluid is connected to a drip chamber, the second actuator operates the inlet valve for enabling flow of a predetermined amount of the source of fluid from the drip chamber to the second portion of the output tubing while controlling the first actuator to close the outlet valve, and maintaining the at least one finger in a respective fixed position.

5. The infusion pump of claim 1, wherein the source of fluid is connected to a drip chamber, the second actuator operates the inlet valve for disabling flow of the source of fluid from the drip chamber to the second portion of the output tubing after a predetermined amount of the source of fluid has flowed to the second portion of the output tubing.

6. The infusion pump of claim 1, wherein the first actuator operates the outlet valve for displacing the at least one finger to expel a predetermined amount of the source of fluid past the outlet valve within a first specified time period, and to close the outlet valve at the end of the first specified time period.

7. The infusion pump of claim 1, further comprising a flow sensor configured for measuring a flow rate of the source of fluid, and memory configured for storing a threshold value of the flow rate, wherein the inlet valve is operated based on the threshold value.

8. The infusion pump of claim 7, wherein the inlet valve is operated based on the flow rate independently from the outlet valve, and the outlet valve is operated based on the flow rate independently from the inlet valve.

9. The infusion pump of claim 1, wherein the infusion pump operates in at least one of:

a gravity-feed mode and an active pumping mode based on a flow rate of the source of fluid.

10. The infusion pump of claim 1, wherein a pumping section of the pump includes an outlet valve, and the pumping section with the at least one finger is configured for acting on the first portion of the output tubing located between the inlet valve and the outlet valve, using a common linkage for controlling the at least one finger and the outlet valve.

11. A computer-implemented method for controlling a flow condition of a source of fluid and delivered to a user through an output tubing, the method comprising:

displacing at least one finger for compressing a first portion of the output tubing to deliver the source of fluid to the user using a first actuator;

selectively operating an inlet valve of the infusion pump to control the flow condition of the source of fluid to the first portion of the output tubing using a second actuator;

disposing an outlet valve downstream of the first portion of the output tubing, and including a second portion of the output tubing between the inlet and outlet valves;

controlling, using a computer processor, the displacement of the at least one finger and the outlet valve independently from the inlet valve using the first actuator; and

controlling, using the computer processor, the operation of the inlet valve independently from the at least one finger and the outlet valve using the second actuator.

12. The method of claim 11, further comprising disposing the inlet valve between a drip chamber connected to the source of fluid and the first portion of the output tubing, and arranging the inlet valve for compressing the output tubing to control the flow condition of the source of fluid through the output tubing.

13. The method of claim 11, further comprising operating said fingers to create a pumping action by partially compressing the first portion of output tubing, and operating said first and second valves to periodically block the first portion of output tubing under the control of the processor.

14. The method of claim 11, further comprising operating, using the second actuator, the inlet valve for enabling flow of a predetermined amount of the source of fluid from a drip chamber connected to the source of fluid to the second portion of the output tubing while controlling the first actuator to close the outlet valve, and maintaining the at least one finger in a respective fixed position.

15. The method of claim 11, further comprising operating, using the second actuator, the inlet valve for disabling flow of the source of fluid from a drip chamber connected to the source of fluid to the second portion of the output tubing after a predetermined amount of the source of fluid has flowed to the second portion of the output tubing.

16. The method of claim 11, further comprising operating, using the first actuator, the outlet valve for displacing the at least one finger to expel a predetermined amount of the source of fluid past the outlet valve within a first specified time period, and to close the outlet valve at the end of the first specified time period.

17. The method of claim 11, further comprising measuring, using a flow sensor, a flow rate of the source of fluid, and storing a threshold value of the flow rate in memory, and operating the inlet valve based on the threshold value.

18. The method of claim 17, further comprising operating the inlet valve based on the flow rate independently from the outlet valve, and operating the outlet valve based on the flow rate independently from the inlet valve.

19. The method of claim 11, further comprising operating the infusion pump in at least one of:

a gravity-feed mode and an active pumping mode based on a flow rate of the source of fluid.

20. The method of claim 11, further comprising providing a pumping section having an outlet valve, wherein the pumping section with the at least one finger is configured for acting on the first portion of the output tubing located between the inlet valve and the outlet valve.