Infusion devices and related consumable calibration methods

• US 10,363,365 B2
• Filed: 02/07/2017
• Issued: 07/30/2019
• Est. Priority Date: 02/07/2017
• Status: Active Grant

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Inventors: Bazargan, Afshin
• Primary Examiner(s): Farrar, Lauren P
• Application Number:
  US15/427,015
• Publication Number:
  US 20180221576A1
• Time in Patent Office: 903 Days
• CPC Class Codes: A61M 2205/3584 using modem, internet or bluetooth
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 2205/52 with memories providing a history of measured variating parameters of apparatus or patient
• CPC Class Codes: A61M 2205/6072 Bar codes
• CPC Class Codes: A61M 2205/70 with testing or calibration facilities
• CPC Class Codes: A61M 2230/201 Glucose concentration
• CPC Class Codes: A61M 5/14216 Reciprocating piston type
• 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 5/1723 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
• CPC Class Codes: G16H 40/63 for local operation

Abstract

Infusion systems including infusion devices and consumables and related operating methods are provided. An exemplary method of operating an infusion device operable to deliver a fluid influencing a physiological condition to a body of a user involves a control module of the infusion device obtaining calibration data associated with a consumable coupled to the infusion device via an interface of the infusion device, determining a delivery command for delivering the fluid to the body of the user based at least in part on the calibration data, and operating a pumping mechanism to deliver the fluid from a reservoir of the consumable to the body of the user in accordance with the delivery command.

Claims

1. A system comprising:

a consumable comprising a housing containing a reservoir, a piston pump pumping mechanism for dispensing a fluid from the reservoir, and a readable element maintaining calibration data characterizing a relationship between delivery of the fluid and actuation of the piston pump pumping mechanism, the piston pump pumping mechanism comprising a mechanism for translating rotation to a linear displacement of a piston coupled to the mechanism, the calibration data comprising an amount of the fluid deliverable from the consumable per stroke of the piston; and

an infusion device having a portion to receive the housing and including an interface to obtain the calibration data from the readable element, an actuation arrangement configured to actuate the piston pump pumping mechanism and a control module coupled to the interface and the actuation arrangement to determine a delivery command based at least in part on the amount of the fluid deliverable from the consumable per stroke of the piston and operate a motor of the actuation arrangement in accordance with the delivery command, wherein the actuation arrangement includes an element configured to rotate the mechanism of the piston pump pumping mechanism and thereby displace the piston in response to rotation of the motor.

2. The system of claim 1, wherein the mechanism comprises a crankshaft.

3. The system of claim 2, wherein the calibration data comprises a measured response at an outlet port of the piston pump pumping mechanism to actuating the crankshaft through a full rotation to actuate the piston through its full range of displacement.

4. The system of claim 1, wherein the mechanism comprises a rack and pinion mechanism or a solenoid mechanism.

5. The system of claim 1, wherein the amount is influenced by variations in dimensions of at least one component of the piston pump pumping mechanism.

6. The system of claim 1, wherein the control module determines the delivery command by calculating a number of strokes of the piston to achieve a desired amount of the fluid based the amount of the fluid deliverable from the consumable per stroke of the piston.

7. The system of claim 1, wherein:

the piston pump pumping mechanism comprises a chamber having the piston disposed therein; and

the calibration data comprises physical measurement data including at least one of;

a linear dimension of the chamber, an inner diameter of the chamber, and an inner circumference of the chamber.

8. The system of claim 1, wherein the calibration data accounts for physical dimensions associated with the consumable.

9. An infusion device comprising:

a housing including a portion for receiving a second housing of a consumable containing a reservoir and a piston pump pumping mechanism for dispensing a fluid from the reservoir;

an interface proximate the portion of the housing to obtain calibration data from the consumable, the calibration data comprising an amount of the fluid deliverable from the consumable per stroke of a piston of the piston pump pumping mechanism, the piston pump pumping mechanism comprising a mechanism for translating rotation to a linear displacement of the piston coupled to the mechanism;

an actuation arrangement contained within the housing, the actuation arrangement comprising a motor and an element coupled to the motor and configured to rotate a mechanism of the piston pump pumping mechanism and thereby displace the piston in response to rotation of the motor to dispense the fluid from the consumable; and

a control module coupled to the interface and the actuation arrangement to determine a delivery command based at least in part on the amount of the fluid deliverable from the consumable per stroke of the piston and operate the motor in accordance with the delivery command.

10. The infusion device of claim 9, wherein the interface comprises a radio frequency identification (RFID) reader.

11. The infusion device of claim 9, wherein the interface comprises a barcode scanner.

12. The infusion device of claim 9, wherein the interface comprises a bus interface integral with a surface of the portion of the housing.

13. The infusion device of claim 9, wherein the interface comprises an electrical terminal integral with a surface of the portion of the housing.

14. A method of operating an infusion device operable to deliver a fluid influencing a physiological condition to a body of a user, the method comprising:

obtaining, by a control module of the infusion device via an interface of the infusion device, calibration data associated with a piston pump pumping mechanism of a consumable coupled to the infusion device, the consumable comprising a housing containing a reservoir and the piston pumping mechanism for dispensing the fluid from the reservoir, wherein the infusion device includes a portion to receive the housing of the consumable and the calibration data comprises an amount of the fluid deliverable from the consumable per stroke of a piston of the piston pump pumping mechanism, the piston pump pumping mechanism comprising a mechanism for translating rotation to a linear displacement of the piston coupled to the mechanism;

determining, by the control module, a delivery command for delivering the fluid to the body of the user based at least in part on the amount of the fluid deliverable from the consumable per stroke of the piston; and

operating, by the control module, an actuation arrangement comprising a motor coupled to an element engaging the piston pump pumping mechanism to rotate a mechanism of the piston pump pumping mechanism and thereby displace the piston in response to rotation of the motor to deliver the fluid from the consumable in accordance with the delivery command.

15. The method of claim 14, further comprising:

obtaining, by the control module, one or more measurement values indicative of the physiological condition in the body of the user from a sensing arrangement; and

determining, by the control module, a dosage of the fluid to be delivered based at least in part on the one or more measurement values and a target value for the physiological condition in the body of the user, wherein determining the delivery command comprises the control module determining the delivery command based at least in part on the dosage and the calibration data.

16. The method of claim 14, the piston pump pumping mechanism being incorporated with the consumable and the infusion device including the actuation arrangement engageable with the piston pump pumping mechanism, wherein:

determining the delivery command comprises;

determining an amount of actuation of the piston pump pumping mechanism for achieving a dosage of the fluid based at least in part on the calibration data; and

determining a commanded amount of actuation of the actuation arrangement to achieve the amount of actuation of the piston pump pumping mechanism; and

operating the actuation arrangement comprises operating the actuation arrangement to achieve the commanded amount of actuation.

17. The method of claim 14, wherein obtaining the calibration data comprises reading the calibration data from a readable element associated with the consumable.

18. The method of claim 14, wherein obtaining the calibration data comprises retrieving the calibration data via the interface of the infusion device from a corresponding interface of the consumable.

19. The method of claim 14, wherein obtaining the calibration data comprises receiving the calibration data from the consumable via a communications interface of the infusion device.