IV fluid line occlusion detector

• US 4,747,828 A
• Filed: 12/09/1986
• Issued: 05/31/1988
• Est. Priority Date: 12/09/1986
• Status: Expired due to Term

• Current Assignee: Cardinal Health 303 Incorporated (Cardinal Health, Inc.)
• Original Assignee: Fisher Scientific Group
• Inventors: Tseo, Gus G.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/939,549
• Time in Patent Office: 539 Days
• Field of Search: 604/245, 604/121, 604/50, 604/67, 604/118, 604/244, 604/151-155, 417/20, 417/38, 417/43
• US Class Current: 604/67
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: A61M 5/16854 by monitoring line pressure

Abstract

A detector for determining when an occlusion has occurred in the fluid line of an IV administration set comprises means associated with an IV infusion pump to determine the resistive force exerted by fluid in the line against the pumping mechanism of the pump. The detector includes a flexible beam which is mounted between the plunger and the activator of the pumping mechanism and which bends proportionately to the magnitude of the resistive force. A strain gauge attached to the beam activates an alarm which stops the IV pump when flexure of the beam indicates an occlusion in the line has occurred.

Claims

1. An occlusion detector in combination with a fluid line for use with an IV administration system which comprises:

means associated with said fluid line for pumping fluid therethrough;

an actuator for driving said pumping means;

a beam operatively connecting said actuator to said pumping menas, said beam being positioned to flex in proportion to the resistive force transmitted by the fluid against said pumping means;

means mounted on said beam for measuring the flexure of said beam; and

means connected with said measuring means for stopping said pumping means when the flexure of said beam indicates a resistive force of predetermined value.

2. An occlusion detector as recited in claim 1 wherein said beam flexure measuring means is a strain gauge.

3. An occlusion detector as recited in claim 2 further comprising means for constraining said pumping means to substantially linear movement.

4. An occlusion detector as recited in claim 3 further comprising an actuator for driving said pumping means.

5. An occlusion detector as recited in claim 4 wherein said beam has a first end and a second end with said first end mounted on said pumping means and said second end mounted on said actuator.

6. An occlusion detector as recited in claim 5 wherein said beam is positioned with its longitudinal axis substantially perpendicular to the direction of linear movement of said pumping means.

7. An occlusion detector as recited in claim 6 wherein said pumping means is disposed for reciprocal linear movement with said actuator.

8. An occlusion detector as recited in claim 7 wherein said pumping means is disposed for reciprocal linear movement with said actuator.

9. An IV fluid line occlusion detector which comprises:

a pumping chamber in fluid communication with said fluid line;

a plunger disposed within said chamber;

an actuator for moving said plunger to pump fluid through said chamber;

a flexible beam having a first end attached to said plunger and a second end attached to said actuator;

means mounted on said beam for measuring means to alarm when said beam obtains a predetermined deflection.

10. An IV fluid line occlusion detector as recited in claim 9 wherein said actuator is positioned for colinear movement with said plunger.

11. An IV fluid line occlusion detector as recited in claim 10 wherein said measuring means is a strain gauge.

12. An IV fluid line occlusion detector as recited in claim 11 wherein said beam is positioned with its longitudinal axis substantially perpendicular to the direction of linear movement of said plunger and said actuator.

13. An IV fluid line occlusion detector as recited in claim 12 wherein said plunger is disposed for reciprocal movement within said chamber.

14. An occlusion detector, in combination with a fluid line, for use with an IV administration system which comprises:

means in operative contact with fluid in said line to pump the fluid therethrough;

means for driving said pumping means;

means connected between said drive means and said pumping means to measure the force therebetween when fluid is being pumped through said line; and

means operatively connected with said measuring means to stop said IV administration system when the force between said actuator and said pumping means reaches a predetermined value.

15. An occlusion detector as recited in claim 14 further comprising a flexible beam having a first end mounted on said pumping means and a second end mounted on said drive means.

16. An occlusion detector as recited in claim 15 wherein said measuring means is mounted on said beam.

17. An occlusion detector as recited in claim 16 wherein said measuring means is a strain gauge.

18. An occlusion detector as recited in claim 17 wherein said drive means and said pumping means are disposed for colinear movement.

19. An occlusion detector as recited in claim 17 wherein said pumping means is disposed for reciprocal movement relative to said fluid line.