Apparatus and process for infusion monitoring

• US 20030048185A1
• Filed: 09/07/2001
• Published: 03/13/2003
• Est. Priority Date: 09/07/2001
• Status: Active Grant

• Current Assignee: Richard A. Citrenbaum
• Original Assignee: Richard A. Citrenbaum
• Inventors: Tyner, Clifford A., Nicholson, Laurence R., Citrenbaum, M.D., Richard A.
• Granted Patent: US 6,690,280 B2
• Time in Patent Office: Days
• US Class Current: 340/540
• CPC Class Codes: A61M 5/16895 by monitoring weight change, e.g. of infusion container
• CPC Class Codes: G01G 17/04 for weighing fluids, e.g. gases, pastes
• CPC Class Codes: Y10S 128/13 Infusion monitoring

Abstract

A process for monitoring infusion into a patient includes hanging a fluid bag from a monitoring apparatus. The weight of the fluid bag is periodically measured, using an electronic weight sensing mechanism and a microprocessor, to detect either a no-fluid-flow condition, a near empty bag condition, or a preselected amount of fluid loss condition. A switch is depressed on the monitoring apparatus for selecting the monitoring of an amount of fluid to be infused totaling less than the fluid within the fluid infusion bag. Otherwise, the apparatus detects a near empty bag condition. An alarm is activated when either the no-fluid-flow condition, the near empty bag condition, or the preselected amount of fluid loss condition has been detected. The rate of fluid loss from the fluid bag can be calculated and displayed.

Claims

1. An infusion monitoring apparatus, comprising:

a housing;

a pole clamp extending from the housing for removable attachment to a pole;

an arm extending from the housing for holding an infusion fluid bag;

an electronic weight sensing mechanism disposed within the housing and associated with the arm;

a control circuit electronically connected to the sensing mechanism for detecting at least one of (1) a no-fluid-flow condition, (2) a near empty bag condition, and (3) preselected amount of fluid loss condition; and

an alarm activated when (1) the no-fluid-flow condition, (2) the near empty bag condition, or (3) the preselected amount of fluid loss condition has been detected.

2. The infusion monitoring apparatus of claim 1, wherein the electronic weight sensing mechanism comprises a magnet associated with the arm, and a Hall-effect sensor disposed adjacent to the magnet.

3. The infusion monitoring apparatus of claim 1, wherein the electronic weight sensing mechanism comprises a load-cell associated with the arm.

4. The infusion monitoring apparatus of claim 1, including externally accessible switches on the housing for selecting an amount of fluid loss to be monitored.

5. The infusion monitoring apparatus of claim 1, including a low battery alarm.

6. The infusion monitoring apparatus of claim 1, wherein the arm extends horizontally from the housing generally opposite the pole clamp.

7. A process for monitoring fluid infusion into a patient, comprising the steps of:

hanging a fluid infusion bag from a monitoring apparatus;

periodically measuring the weight of the fluid infusion bag, using an electronic weight sensing mechanism and a control circuit, to detect at least one of (1) a no-fluid-flow condition, (2) a near empty bag condition, and (3) a preselected amount of fluid loss condition; and

activating an alarm when (1) the no fluid flow condition, (2) the near empty bag condition, or (3) the preselected amount of fluid loss condition has been detected.

8. The process of claim 7, including the step of setting a near empty bag set point weight by hanging a weight from the monitoring apparatus, electronically saving the near empty bag set point weight, and using the near empty bag set point weight to detect the near empty bag condition.

9. The process of claim 8, wherein the near empty bag set point weight approximates an empty fluid infusion bag system with a nominal amount of fluid therein.

10. The process of claim 7, including the step of depressing a switch on the monitoring apparatus for selecting the monitoring of an amount of fluid to be infused totaling less than the fluid within the fluid infusion bag.

11. The process of claim 7, wherein the measuring step includes the step of taking multiple weight measurements over a short period of time and creating and electronically saving a reading.

12. The process of claim 11, including the step of determining if the reading is within acceptable limits when compared to prior electronically saved readings.

13. The process of claim 12, including the step of accepting a reading within acceptable limits, or taking additional weight measurements over a short period of time to create a new reading if the immediately prior reading was without the acceptable limits.

14. The process of claim 7, wherein (1) the no-fluid-flow condition is detected by determining that the weight of the fluid infusion bag has not decreased over a predetermined period of time.

15. The process of claim 7, wherein (1) the no-fluid-flow condition is detected by determining that the weight of the fluid infusion bag has not decreased a predetermined amount over a period of time.

16. The process of claim 7, including the step of calculating and displaying the rate of fluid loss from the fluid bag.

17. The process of claim 7, including the step of maintaining the monitoring apparatus in a semi-inactive, battery conserving state and periodically self-activating to determine if a weight has been hung from the monitoring apparatus.

18. The process of claim 7, including the step of activating an alarm when low battery power is detected.

19. The process of claim 7, including the step of transmitting a signal to a remote electronic device to activate an alarm when (1) the no fluid flow condition, (2) the near empty bag condition, or (3) the preselected amount of fluid loss condition has been detected.