Calculating insulin on board for extended bolus being delivered by an insulin delivery device

• US 8,140,275 B2
• Filed: 07/18/2008
• Issued: 03/20/2012
• Est. Priority Date: 07/18/2008
• Status: Active Grant

• Current Assignee: Insulet Corporation
• Original Assignee: Insulet Corporation
• Inventors: Campbell, Robert, Abramovich, Amanda
• Primary Examiner(s): BHAT, ADITYA S
• Application Number:
  US12/175,970
• Publication Number:
  US 20100017141A1
• Time in Patent Office: 1,341 Days
• Field of Search: 702/50
• US Class Current: 702/50
• CPC Class Codes: A61M 2005/14208 with a programmable infusion control system, characterised by the infusion program
• CPC Class Codes: A61M 2230/201 Glucose concentration
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• 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

A system and method may be used to calculate insulin on board (IOB) for an extended bolus being delivered by an insulin infusion pump. In general, the system and method calculates an extended bolus IOB value for the extended bolus, which takes into account the insulin currently on board from the extended bolus and the insulin scheduled to be delivered by the extended bolus over a subsequent time period equivalent to a duration of insulin action. The extended bolus IOB value may be used to calculate a suggested bolus.

Claims

1. A computer implemented method of calculating insulin on board (IOB) for an extended bolus being delivered by an insulin infusion device, the method, performed via one or more processors, comprising:

determining a completed IOB value representing an amount of insulin on board from a completed portion of the extended bolus that has been completed within a previous time period substantially equal to a duration of insulin action;

determining a scheduled IOB value representing an amount of insulin scheduled to be delivered during a scheduled portion of the extended bolus within a subsequent time period substantially equal to the duration of insulin action; and

adding the completed IOB value to the scheduled IOB value to produce an extended bolus IOB value.

2. The method of claim 1 wherein the completed portion of the extended bolus is represented by a series of immediate bolus portions delivered at different times during the previous time period, and wherein determining the completed IOB value includes calculating IOB values for each of the series of immediate bolus portions at the respective times and adding the calculated IOB values for the series of immediate bolus portions.

3. The method of claim 2 wherein the calculated IOB values for each of the immediate bolus portions is calculated according to the equation V×

(1−

T_e/DIA), wherein V is the volume of the immediate bolus portion, DIA is the duration of insulin action, and T_e is the elapsed time since the immediate bolus portion was delivered.

4. The method of claim 1 wherein the extended bolus is a meal bolus.

5. A non-transitory machine-readable medium whose contents cause a processor to perform a method of calculating insulin on board (IOB) for an extended bolus delivered by an insulin infusion device, the method comprising:

determining a completed IOB value representing an amount of insulin on board from a completed portion of the extended bolus that has been completed within a previous time period substantially equal to a duration of insulin action;

determining a scheduled IOB value representing an amount of insulin scheduled to be delivered during a scheduled portion of the extended bolus within a subsequent time period substantially equal to the duration of insulin action; and

adding the completed IOB value to the scheduled IOB value to produce an extended bolus IOB value.

6. The non-transitory machine-readable medium of claim 5 wherein the completed portion of the extended bolus is represented by a plurality of bolus portions delivered at different times during the previous time period, and wherein determining the completed IOB value includes calculating IOB values for each of the plurality of bolus portions at the respective times and adding the calculated IOB values for the plurality of bolus portions.

7. The non-transitory machine-readable medium of claim 5 wherein each of the calculated IOB values is calculated according to the equation V×

(1×

T_e/DIA), wherein V is the volume of the bolus portion, DIA is the duration of insulin action, and T_e is the elapsed time since the bolus portion was delivered.