Infusion pump and method with dose-rate calculation

• US 5,609,575 A
• Filed: 04/04/1995
• Issued: 03/11/1997
• Est. Priority Date: 04/11/1994
• Status: Expired due to Fees

• Current Assignee: Graseby Medical Limited
• Original Assignee: Graseby Medical Limited
• Inventors: Mickelson, Anne F., Larson, Stella D., Eisenberg, Peter M.
• Primary Examiner(s): MENDEZ, MANUEL A
• Application Number:
  US08/417,434
• Time in Patent Office: 707 Days
• Field of Search: 604/30-34, 604/49-53, 604/65-67, 604/118, 604/151, 604/250-253, 128/DIG. 13, 128/DIG. 14
• US Class Current: 604/65
• CPC Class Codes: A61M 2005/14208 with a programmable infusion control system, characterised by the infusion program
• CPC Class Codes: A61M 5/14224 Diaphragm type
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: G16H 20/17 delivered via infusion or injection

Abstract

An infusion pump and method of operating an infusion pump in which the user of the infusion pump is prompted to input a number of infusion parameters, which include a dose mode, a drug dose, a drug amount, and a drug volume. After the parameters are input by the user, the infusion pump automatically calculates an infusion rate corresponding to the desired drug dose input by the user. The infusion pump, which includes a fluid pump, may round the calculated infusion rate to conform it to a flow rate which the fluid pump can deliver. If the infusion rate is rounded, the infusion pump calculates the actual drug dose from the rounded infusion rate and displays the actual dose on a visual display to allow the user of the infusion pump to determine how much the actual dose varies from the intended dose input by the user. After the actual dose is determined, the infusion pump continuously infuses the patient with the drug at the displayed infusion rate.

Claims

1. A method of operating an infusion pump comprising the steps of:

(a) prompting a user of the infusion pump to input a plurality of infusion parameters into the infusion pump, said plurality of infusion parameters including an intended drug dose of a drug to be administered to a patient;

(b) calculating a drug flow rate based upon said plurality of infusion parameters input by the user during said step (a);

(c) rounding said drug flow rate calculated in said step (b) to generate a rounded drug flow rate;

(d) calculating an actual drug dose from said rounded drug flow rate, said actual drug dose representing the actual drug dose to be infused to the patient; and

(e) generating a visual display of said actual drug dose to allow the user to compare said actual drug dose with said intended drug dose.

2. A method as defined in claim 1 additionally comprising the step of (f) continuously infusing the patient with said drug according to said rounded drug flow rate.

3. A method as defined in claim 1 wherein said step (a) additionally comprises the steps of:

(a1) prompting the user to input a dose mode into the infusion pump;

(a2) prompting the user to input a drug amount into the infusion pump; and

(a3) prompting the user to input a drug volume into the infusion pump.

4. A method as defined in claim 3 wherein said step (a) additionally comprises the step of (a4) prompting the user to input the weight of the patient into the infusion pump.

5. A method as defined in claim 1 wherein said step (a) additionally comprises the steps of:

(a1) prompting the user to input a dose mode being selectable frown a plurality of dose modes including a first dose mode being micrograms/kilogram/minute, a second dose mode being micrograms/minute, a third dose mode being milligrams/minute, and a fourth dose mode being milligrams/hour;

(a2) prompting the user to input a drug amount into the infusion pump; and

(a3) prompting the user to input a drug volume into the infusion pump.

6. A method as defined in claim 5 additionally comprising the step of (f) infusing said drug into the patient from a drug container, wherein said drug volume is the fluid volume of said drug in said drug container and said drug amount is the amount of said drug in said drug container.

7. A method as defined in claim 1 wherein said step (a) is performed while the patient is being infused with said drug.

8. A method as defined in claim 1 wherein said step (a) additionally comprises the steps of:

(a1) prompting the user of the infusion pump to input a dose mode selectable from a plurality of dose modes including a first dose mode which is based upon the weight of the patient to be infused by the infusion pump and a second dose mode which is not based upon the weight of the patient to be infused by the infusion pump;

(a2) determining whether the user input said first dose mode to the infusion pump or said second dose mode to the infusion pump; and

(a3) prompting the user for the weight of the patient only if the user input said first dose mode.

9. An apparatus having a memory which contains data generated by the method of claim 1.

10. A method of operating an infusion pump comprising the steps of:

(a) continuously infusing a patient with a drug over a first period of time via an infusion pump;

(b) prompting a user of the infusion pump to input a plurality of infusion parameters into the infusion pump during said step (a) while the patient is being continuously infused with said drug, said step (b) comprising the steps of;

(b1) first prompting the user to input a dose mode; and

(b2) after said step (b1), prompting the user to input a drug dose;

(c) calculating a drug flow rate based upon said plurality of infusion parameters input by the user during said step (b); and

(d) continuously infusing the patient with said drug over a second period of time based upon said drug flow rate calculated in said step (c).

11. A method as defined in claim 10 wherein said step (c) is performed while the patient is being continuously infused with said drug during said step (a).

12. A method as defined in claim 10 additionally comprising the step of (e) rounding said drug flow rate calculated in said step (c) to generate a rounded drug flow rate and wherein said flow rate infused to the patient during said step (d) is based on said rounded drug flow rate.

13. A method as defined in claim 12 additionally comprising the steps of:

(f) calculating an actual drug dose from said rounded drug flow rate, said actual drug dose representing the actual drug dose to be infused to the patient; and

(g) generating a visual display of said actual drug dose.

14. A method as defined in claim 10 wherein said step (b) comprises the steps of:

(b3) prompting the user to input a drug amount into the infusion pump; and

(b4) prompting the user to input a drug volume into the infusion pump.

15. A method as defined in claim 14 wherein said drug is infused into the patient from a drug container and wherein said drug volume is the fluid volume of said drug in said drug container and said drug amount is the amount of said drug in said drug container.

16. A method as defined in claim 14 wherein said step (b) additionally comprises the step of (b5) prompting the user to input the weight of the patient into the infusion pump.

17. A method as defined in claim 10 wherein said dose mode is selectable from a plurality of dose modes including a first dose mode being micrograms/kilogram/minute, a second dose mode being micrograins/minute, a third dose mode being milligrams/minute, and a fourth dose mode being milligrams/hour, said step (b) additionally comprising the steps of:

(b3) prompting the user to input a drug amount into the infusion pump; and

(b4) prompting the user to input a drug volume into the infusion pump.

18. A method as defined in claim 10 wherein said dose mode is selectable from a plurality of dose modes including a first dose mode which is based upon the weight of the patient to be infused by the infusion pump and a second dose mode which is not based upon the weight of the patient to be infused by the infusion pump, said step (b) additionally comprising the steps of:

(b3) determining whether the user input said first dose mode to the infusion pump or said second dose mode to the infusion pump; and

(b4) prompting the user for the weight of the patient only if the user input said first dose mode.

19. A method of operating an infusion pump comprising the steps of:

(a) prompting a user of the infusion pump to input a plurality of infusion parameters into the infusion pump, said plurality of infusion parameters including a dose mode being selectable from a plurality of dose nodes including a first dose mode which is based upon the weight of a patient to be infused by the infusion pump and a second dose mode which is not based upon the weight of a patient to be infused by the infusion pump;

(b) determining whether the user input said first dose mode to the infusion pump or said second dose mode to the infusion pump;

(c) prompting the user for the weight of the patient only if the user input said first dose mode;

(d) calculating a drug flow rate based upon said plurality of infusion parameters input by the user; and

(e) continuously infusing the patient with said drug over a period of time based upon said drug flow rate calculated in said step (d).

20. A method as defined in claim 19 wherein said step (a) additionally comprises the steps of:

(a1) prompting the user to input a drug dose into the infusion pump;

(a2) prompting the user to input a drug amount into the infusion pump; and

(a3) prompting the user to input a drug volume into the infusion pump.

21. A method as defined in claim 19 wherein said plurality of dose modes include a first dose mode being micrograms/kilogram/minute, a second dose mode being micrograms/minute, a third dose mode being milligrams/minute, and a fourth dose mode being milligrams/hour, said step (a) additionally comprising the steps of:

(a1) prompting the user to input a drug dose into the infusion pump;

(a2) prompting the user to input a drug amount into the infusion pump; and

(a3) prompting the user to input a drug volume into the infusion pump.

22. A method as defined in claim 21 wherein said drug is infused into the patient from a drug container and wherein said drug volume is the fluid volume of said drug in said drug container and said drug amount is the amount of said drug in said drug container.

23. A method as defined in claim 19 additionally comprising the step of (f) rounding said drug flow rate calculated in said step (d) to generate a rounded drug flow rate and wherein said flow rate infused to the patient during said step (e) is based on said rounded drug flow rate.

24. A method as defined in claim 19 additionally comprising the steps of:

(f) calculating an actual drug dose from said drug flow rate calculated in said step (d), said actual drug dose representing the actual drug dose to be infused to the patient; and

(g) generating a visual display of said actual drug dose.

25. A method as defined in claim 19 wherein said step (a) is performed while the patient is being infused with said drug.

26. A method as defined in claim 19 wherein said first dose mode is selected from the group of dose modes consisting of micrograms/kilogram/minute, milligrams/kilogram/hour, micrograms/kilogram/hour, and milligrams/kilogram/minute and wherein said second dose mode is selected from the group of dose modes consisting of micrograms/minute, milligrams/minute, milligrams/hour, and units/hour.

27. An infusion pump for the continuous infusion of a drug from a drug source into a patient over a period of time, said infusion pump comprising:

pump means for continuously infusing the patient with the drug over a first period of time;

means for prompting a user of said infusion pump to input a dose mode to said infusion pump while the patient is being infused with the drug by said pump means;

means for prompting the user to input an intended drug dose to said infusion pump while the patient is being infused with the drug by said pump means;

means for prompting the user to input a drug amount to said infusion pump while the patient is being infused with the drug by said pump means;

means for prompting the user to input a drug volume to said infusion pump while the patient is being infused with the drug by said pump means;

means for determining whether the user input a dose mode requiring the body weight of the patient;

means for prompting the user to input the body weight of the patient to said infusion pump only if the user selected a dose mode based on the body weight of the patient;

means for determining a drug infusion rate based upon said dose mode, said drug dose, said drug amount, and said drug volume input by the user;

means for rounding said drug infusion rate to generate a rounded drug infusion rate;

means for calculating an actual drug dose from said rounded drug infusion rate, said actual drug dose representing the actual drug dose to be infused to the patient over a second period of time; and

display means for generating a visual display of said actual drug dose to allow the user to compare said actual drug dose with said intended drug dose,

said pumping means infusing the patient with the drug in accordance with said drug infusion rate over said second period of time.

28. An infusion pump, comprising:

means for prompting a user of the infusion pump to input a plurality of infusion parameters into the infusion pump, said plurality of infusion parameters including an intended drug dose of a drug to be administered to a patient;

means for calculating a drug flow rate based upon said plurality of infusion parameters input by the user;

means for rounding said drug flow rate calculated by said calculation means to generate a rounded drug flow rate;

means for calculating an actual drug dose from said rounded drug flow rate, said actual drug dose representing the actual drug dose to be infused to the patient; and

means for generating a visual display of said actual drug dose to allow the user to compare said actual drug dose with said intended drug dose.

29. An infusion pump as defined in claim 28 additionally comprising means for continuously infusing the patient with said drug according to said rounded drug flow rate.

30. An infusion pump as defined in claim 28 wherein said prompting means comprises:

means for prompting the user to input a dose mode into the infusion pump;

means for prompting the user to input a drug amount into the infusion pump; and

means for prompting the user to input a drug volume into the infusion pump.

31. An infusion pump as define in claim 30 wherein said prompting means additionally comprises means for prompting the user to input the weight of the patient into the infusion pump.

32. An infusion pump as defined in claim 28 wherein said prompting means additionally comprises:

means for prompting the user to input a dose mode being selectable from a plurality of dose modes including a first dose mode being micrograms/kilogram/minute, a second dose mode being micrograms/minute, a third dose mode being milligrams/minute, and a fourth dose mode being milligrams/hour;

means for prompting the user to input a drug amount into the infusion pump; and

means for prompting the user to input a drug volume into the infusion pump.

33. An infusion pump as defined in claim 28 wherein said prompting means additionally comprises:

means for prompting the user of the infusion pump to input a dose mode selectable from a plurality of dose modes including a first dose mode which is based upon the weight of the patient to be infused by the infusion pump and a second dose mode which is not based upon the weight of the patient to be infused by the infusion pump;

means for determining whether the user input said first dose mode to the infusion pump or said second dose mode to the infusion pump; and

means for prompting the user for the weight of the patient only if the user input said first dose mode.

34. An infusion pump, comprising:

means for continuously infusing a patient with a drug over a first period of time;

means for prompting a user of the infusion pump to input a plurality of infusion parameters into the infusion pump while the patient is being continuously infused with said drug, said prompting means comprising;

means for prompting the user to input a dose mode; and

means for prompting the user to input a drug dose after said dose mode is input;

means for calculating a drug flow rate based upon said plurality of infusion parameters input by the user; and

means for continuously infusing the patient with said drug over a second period of time based upon said drug flow rate calculated by said calculating means.

35. An infusion pump as defined in claim 34 wherein said means for continuously infusing the patient comprises means for continuously infusing the patient with said drug over a second period of time based upon said drug flow rate calculated by said calculating means.

36. An infusion pump as defined in claim 34 additionally comprising means for rounding said drug flow rate calculated by said calculating means to generate a rounded drug flow rate and wherein said means for continuously infusing the patient comprises means for continuously infusing the patient with said drug over a second period of time based upon said rounded drug flow rate calculated by said rounding means.

37. An infusion pump as defined in claim 36 additionally comprising:

means for calculating an actual drug dose from said rounded drug flow rate, said actual drug dose representing the actual drug dose to be infused to the patient; and

means for generating a visual display of said actual drug dose.

38. An infusion pump as defined in claim 34 wherein said means for prompting the user to input a dose mode comprises means for prompting the user to input a dose mode selectable from a plurality of dose modes including a first dose mode being micrograms/kilogram/minute, a second dose mode being micrograms/minute, a third dose mode being milligrams/minute, and a fourth dose mode being milligrams/hour, said prompting means additionally comprising:

means for prompting the user to input a drug amount into the infusion pump; and

means for prompting the user to input a drug volume into the infusion pump.

39. An infusion pump as defined in claim 34 wherein said means for prompting the user to input a dose mode comprises means for prompting the user to input a dose mode selectable from a plurality of dose modes including a first dose mode which is based upon the weight of the patient to be infused by the infusion pump and a second dose mode which is not based upon the weight of the patient to be infused by the infusion pump, the infusion pump additionally comprising:

means for determining whether the user input said first dose mode to the infusion pump or said second dose mode to the infusion pump; and

means for prompting the user for the weight of the patient only if the user input said first dose mode.

40. An infusion pump, comprising:

means for prompting a user of the infusion pump to input a plurality of infusion parameters into the infusion pump, said plurality of infusion parameters including a dose mode being selectable from a plurality of dose modes including a first dose mode which is based upon the weight of a patient to be infused by the infusion pump and a second dose mode which is not based upon the weight of a patient to be infused by the infusion pump;

means for determining whether the user input said first dose mode to the infusion pump or said second dose mode to the infusion pump;

means for prompting the user for the weight of the patient only if the user input said first dose mode;

means for calculating a drug flow rate based upon said plurality of infusion parameters input by the user; and

means for continuously infusing the patient with said drug over a period of time based upon said drug flow rate calculated by said calculating means.

41. An infusion pump as defined in claim 40 wherein said means for continuously infusing the patient with said drug comprises means for continuously infusing the patient with said drug from a drug container over a period of time based upon said drug flow rate calculated by said calculating means and wherein said prompting means additionally comprises:

means for prompting the user to input a drug amount into the infusion pump, said drug amount being the amount of said drug in said drug container; and

means for prompting the user to input a drug volume into the infusion pump, said drug volume being the fluid volume of said drug in said drug container.

42. An infusion pump as defined in claim 40 additionally comprising means for rounding said drug flow rate calculated by said calculating means to generate a rounded drug flow rate and wherein said means for continuously infusing the patient comprises means for continuously infusing the patient with said drug based upon said rounded drug flow rate calculated by said rounding means.

43. An infusion pump as defined in claim 40 additionally comprising:

means for calculating an actual drug dose from said rounded drug flow rate, said actual drug dose representing the actual drug dose to be infused to the patient; and

means for generating a visual display of said actual drug dose.

44. An infusion pump as defined in claim 40 wherein said means for prompting a user of the infusion pump to input a plurality of infusion parameters comprises:

means for prompting the user for a first dose mode selected from the group of dose modes consisting of micrograms/kilogram/minute, milligrams/kilogram/hour, micrograms/kilogram/hour, and milligrams/kilogram/minute; and

means for prompting the user for a second dose mode selected from the group of dose modes consisting of micrograms/minute, milligrams/minute, milligrams/hour, and units/hour.