Circulatory Pressure Monitoring Using Infusion Pump Systems

• US 20110152697A1
• Filed: 12/17/2010
• Published: 06/23/2011
• Est. Priority Date: 12/18/2009
• Status: Abandoned Application

• Current Assignee: Sims Company
• Original Assignee: K&Y Corporation
• Inventors: Kawamura, Yasuhiro
• Application Number:
  US12/972,394
• Publication Number:
  US 20110152697A1
• Time in Patent Office: Days
• US Class Current: 600/485
• CPC Class Codes: A61B 5/02152 specially adapted for venous pressure
• CPC Class Codes: A61M 2205/0244 Micromachined materials, e.g. made from silicon wafers, microelectromechanical systems [MEMS] or comprising nanotechnology
• CPC Class Codes: A61M 2205/0294 Piezoelectric materials
• 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 2205/3553 remote, e.g. between patient's home and doctor's office
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/70 with testing or calibration facilities
• CPC Class Codes: A61M 2230/30 Blood pressure A61M2230/04 takes precedence
• 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 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/16854 by monitoring line pressure
• CPC Class Codes: A61M 5/16877 Adjusting flow; Devices for setting a flow rate
• CPC Class Codes: A61M 5/16886 for measuring fluid flow rate, i.e. flowmeters
• CPC Class Codes: A61M 5/1723 using feedback of body parameters, e.g. blood-sugar, pressure measurement of body parameters A61B5/00

Abstract

A low cost, transportable system for monitoring the central venous pressure of a patient receiving an infusion is provided. The pressure monitoring system of the present invention employs a pump and a flow meter in order to supply infusion fluids to a patient. Based upon the control factors and changes thereof communicated to the pump by a controller in order to achieve and maintain a desired infusion fluid flow rate, relative changes in patient'"'"'s venous pressure and/or quantitative pressure data is obtained.

Claims

1. A method for monitoring patient circulatory pressure comprising:

generating a first infusion fluid pressure for delivery of an infusion fluid to a patient;

generating a second infusion fluid pressure responsive to a patient circulatory pressure;

determining patient circulatory pressure data based on a difference in control factors employed to generate the first infusion fluid pressure and the second infusion fluid pressure.

2. The method of claim 1 wherein the step of generating a first infusion fluid pressure for delivery of an infusion fluid to a patient comprises pumping infusion fluid through a piezoelectric driven pump.

3. The method of claim 1 wherein the step of generating a first infusion fluid pressure for delivery of an infusion fluid to a patient comprises determining an infusion fluid flow rate with a flow meter.

4. The method of claim 1 wherein the step of generating a first infusion fluid pressure for delivery of an infusion fluid to a patient comprises generating a first infusion fluid pressure greater than the patient circulatory pressure.

5. The method of claim 1 wherein the step of generating a second infusion fluid pressure responsive to a patient circulatory pressure comprises determining an infusion fluid flow rate with a flow meter.

6. The method of claim 1 wherein the step of generating a second infusion fluid pressure responsive to a patient circulatory pressure comprises generating a second infusion fluid pressure greater than the patient circulatory pressure.

7. The method of claim 1 wherein the step of generating a second infusion fluid pressure responsive to a patient circulatory pressure comprises providing a control factor to an infusion pump.

8. The method of claim 7 wherein the step of providing a control factor to an infusion pump comprises determining the control factor based upon infusion fluid flow data received from a flow meter.

10. The method of claim 1 wherein the step of determining patient circulatory pressure data based on a difference in control factors employed to generate the first infusion fluid pressure and the second infusion fluid pressure comprises analyzing control factors employed to direct operation of an infusion pump.

11. The method of claim 1 further comprising the step of correlating specific control factors to a range of different pressures.

12. The method of claim 1 further comprising the step of designating control factors for an infusion pressure equal to zero.

13. A patient circulatory pressure monitoring system comprising:

an infusion pump;

a flow meter in fluid communication with the infusion pump; and

a controller in electrical communication with the infusion pump and the flow meter, the controller further comprising a data correlation of infusion pump control factors and circulatory pressures.

14. The system of claim 13 wherein the infusion pump is a piezoelectric driven infusion pump.

15. The system of claim 13 wherein a control factor comprises a voltage.

16. The system of claim 13 wherein a control factor comprises a frequency.

17. A method for monitoring patient circulatory pressure comprising:

providing a first control factor to an infusion pump;

providing a second control factor to an infusion pump responsive to a patient circulatory pressure;

determining patient circulatory pressure data based on a difference in the first control factor and second control factor.

18. The method of claim 17 wherein the step of providing a first control factor to an infusion pump comprises providing a first control factor to a piezoelectric driven infusion pump.

19. The method of claim 17 wherein the step of providing a first control factor to an infusion pump comprises directing the infusion pump to generate an infusion fluid pressure greater than the patient circulatory pressure.

20. The method of claim 17 wherein the step of providing a second control factor to an infusion pump responsive to a patient circulatory pressure comprises directing the infusion pump to generate an infusion fluid pressure greater than the patient circulatory pressure