Infusion pump and method to enhance long term medication delivery accuracy

• US 9,056,166 B2
• Filed: 01/21/2013
• Issued: 06/16/2015
• Est. Priority Date: 01/21/2013
• 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: Zhu, Hong
• Primary Examiner(s): VU, QUYNH-NHU HOANG
• Application Number:
  US13/746,061
• Publication Number:
  US 20140207057A1
• Time in Patent Office: 876 Days
• Field of Search: 604/65, 604/67, 604/131
• US Class Current: 1/1
• CPC Class Codes: A61M 2005/14208 with a programmable infusion control system, characterised by the infusion program
• CPC Class Codes: A61M 2005/14506 mechanically driven, e.g. spring or clockwork
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 2205/3341 stabilising pressure or flow to avoid excessive variation
• CPC Class Codes: A61M 2205/3355 Controlling downstream pump pressure
• CPC Class Codes: A61M 2205/702 automatically during use
• CPC Class Codes: A61M 5/14212 Pumping with an aspiration and an expulsion action
• 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 5/1454 spring-actuated, e.g. by a clockwork
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: A61M 5/1723 using feedback of body parameters, e.g. blood-sugar, pressure measurement of body parameters A61B5/00
• CPC Class Codes: G16H 20/17 delivered via infusion or injection

Abstract

An infusion pump is provided for pumping fluid though an administration set at a constant flow rate. The pump includes a pumping mechanism for pumping fluid and operates at a pulse frequency, and a controller controls the pulse frequency. Additionally, the pump has one or more sensors configured for measuring at least one characteristic value relating to a status of the infusion pump. The controller is configured for causing the pumping mechanism to operate at a first pulse frequency, and the one or more sensors measure the characteristic value intermittently. When the measured characteristic value meets a threshold value, the controller causes the pumping mechanism to operate at a second pulse frequency different from the first pulse frequency.

Claims

1. An infusion pump for pumping fluid though an administration set at a constant flow rate over a long duration, the pump comprising:

a pumping mechanism configured for pumping fluid, said pumping mechanism operating at a pulse frequency; and

a controller for controlling said pulse frequency of said pumping mechanism; and

one or more sensors capable of measuring at least one characteristic value relating to a status of said pumping mechanism;

said controller configured for operating said pumping mechanism at a first pulse frequency;

said one or more sensors measure said at least one characteristic value intermittently; and

wherein when said at least one characteristic value meets a threshold value, said controller causes said pumping mechanism to operate at a second pulse frequency, said second pulse frequency being different from said first pulse frequency;

wherein said threshold value is calculated based on a material used to form the administration set.

2. The infusion pump of claim 1, wherein at least one of said one or more sensors is a timer, and wherein said threshold value is an elapsed time.

3. The infusion pump of claim 1, wherein the pumping mechanism is capable of pumping fluid by compressing the administration set, and

wherein at least one of said one or more sensors is a pressure sensor sensors connected to said pumping mechanism and capable of measuring a springback force of the administration set after being compressed by said pumping mechanism.

4. The infusion pump of claim 1, further comprising an air advance mechanism for temporarily increasing said pulse frequency to allow for an increased flow rate for the duration of pumping approximately 1 ml of the fluid.

5. The infusion pump of claim 1, wherein said calculated threshold value is also based on a flow rate.

6. The infusion pump of claim 1, said threshold value is a first threshold value, and wherein when said characteristic value measured by said one or more sensors meets a second threshold value different than said first threshold value, said controller causes said pumping mechanism to operate at a third pulse frequency, said third pulse frequency being greater than said first pulse frequency and said second pulse frequency.

7. The infusion pump of claim 1, wherein said controller causes said pumping mechanism to stop pumping if an ambient temperature is less than about 15°

C. or if said ambient temperature is greater than about 38°

C.

8. An infusion pump for pumping fluid though an administration set at a constant flow rate over a long duration, the pump comprising:

a pumping mechanism configured for pumping fluid by compressing the administration set, said pumping mechanism operating at a pulse frequency;

one or more pressure sensors connected to said pumping mechanism and capable of measuring a springback force of the administration set after being compressed by said pumping mechanism; and

a controller for controlling said pulse frequency of said pumping mechanism, wherein said controller causes said pumping mechanism to operate at a first pulse frequency;

said one or more pressure sensors measuring said springback force intermittently; and

when said springback force measured by said one or more pressure sensors is lower than a threshold value, said controller causes said pumping mechanism to operate at a second pulse frequency, said second pulse frequency being greater than said first pulse frequency;

wherein said threshold value is calculated based on a material used to form the administration set.

9. The infusion pump of claim 8, wherein said threshold value is a first threshold value, and wherein when said measured springback force measured by said one or more pressure sensors is lower than a second threshold value smaller than said first threshold value, said controller causes said pumping mechanism to operate at a third pulse frequency, said third pulse frequency being greater than said first pulse frequency and said second pulse frequency.

10. The infusion pump of claim 8, wherein said one or more pressure sensors measure said springback force prior to operation of the pump, and the material used to form the administration set is determined based on said measured springback force.

11. The infusion pump of claim 8, wherein said springback force is measured while the administration set contains fluid.

12. The infusion pump of claim 8, further comprising an air advance mechanism for temporarily increasing said pulse frequency to allow for an increased flow rate for the duration of pumping approximately 1 ml of the fluid.

13. An infusion pump for pumping fluid through an administration set at a constant flow rate over a long duration, the pump comprising:

a pumping mechanism for pumping fluid, said pumping mechanism operating at a pulse frequency; and

a controller for controlling said pulse frequency of said pumping mechanism;

said controller is configured for causing said pumping mechanism to operate at a first pulse frequency for a period of time, and

after said period of time has elapsed, said controller is configured for causing said pumping mechanism to operate at a second pulse frequency, said second pulse frequency being greater than said first pulse frequency;

wherein said period of time is calculated based on a material used to form the administration set.

14. The infusion pump of claim 13, wherein said calculated period of time is also based on a flow rate.

15. The infusion pump of claim 13, further comprising an air advance mechanism for temporarily increasing said pulse frequency to allow for an increased flow rate for the duration of pumping approximately 1 ml of the fluid.

16. The infusion pump of claim 13, wherein said period of time is a first period of time, and wherein after a second period of time longer than said first period of time has elapsed, said controller causes said pumping mechanism to operate at a third pulse frequency, said third pulse frequency being greater than said first pulse frequency and said second pulse frequency.

17. The infusion pump of claim 13, further comprising a tube presence detector configured to detect the presence of the administration set within the infusion pump.