Fluid reservoir seating procedure for a fluid infusion device

• US 8,690,855 B2
• Filed: 06/20/2012
• Issued: 04/08/2014
• Est. Priority Date: 12/22/2010
• Status: Active Grant

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Inventors: Alderete, Juan M. Jr., Monirabbasi, Salman
• Primary Examiner(s): BERDICHEVSKY, AARTI
• Application Number:
  US13/528,258
• Publication Number:
  US 20120259282A1
• Time in Patent Office: 657 Days
• Field of Search: 604/131, 604/151, 604/503, 604/505
• US Class Current: 604/503
• CPC Class Codes: A61M 2005/14208 with a programmable infusion control system, characterised by the infusion program
• CPC Class Codes: A61M 2005/14506 mechanically driven, e.g. spring or clockwork
• CPC Class Codes: A61M 2005/16863 Occlusion detection
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/332 Force measuring means
• CPC Class Codes: A61M 5/1413 Modular systems comprising interconnecting elements
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/1452 pressurised by means of pistons
• 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 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: A61M 5/5086 for indicating if defective, used, tampered with or unsterile

Abstract

A method of seating a fluid reservoir in a housing of a fluid infusion device is presented here. The method is performed prior to establishing an outgoing fluid flow path from the fluid reservoir. The method begins by detecting insertion of the fluid reservoir into the housing of the fluid infusion device. In response to detecting the insertion, the method determines whether the fluid reservoir is in need of depressurization. When the fluid reservoir is in need of depressurization, the drive motor assembly of the fluid infusion device is rewound to depressurize the fluid reservoir. After depressurizing the fluid reservoir, an equalization state for the fluid reservoir is achieved. After achieving the equilibrium state, the drive motor assembly is advanced to obtain an initial seated state for the fluid reservoir.

Claims

1. A method of seating a fluid reservoir in a housing of a fluid infusion device prior to establishing an outgoing fluid flow path from the fluid reservoir, the fluid infusion device comprising a drive motor assembly for the fluid reservoir, the method comprising:

detecting insertion of the fluid reservoir into the housing;

in response to the detecting, determining whether the fluid reservoir is in need of depressurization;

when the fluid reservoir is in need of depressurization, rewinding the drive motor assembly to depressurize the fluid reservoir;

after depressurizing the fluid reservoir, achieving an equilibrium state for the fluid reservoir; and

after achieving the equilibrium state, advancing the drive motor assembly to obtain an initial seated state for the fluid reservoir.

2. The method of claim 1, further comprising:

after advancing the drive motor assembly to obtain the initial seated state, coupling the fluid reservoir to a fluid delivery conduit to deliver fluid from the fluid reservoir to a user.

3. The method of claim 1, wherein:

rewinding the drive motor assembly to depressurize the fluid reservoir is performed using a first pulse-width modulation duty cycle;

advancing the drive motor assembly to obtain the initial seated condition is performed using a second pulse-width modulation duty cycle; and

the first pulse-width modulation duty cycle is different than the second pulse-width modulation duty cycle.

4. The method of claim 1, further comprising:

after advancing the drive motor assembly to obtain the initial seated state, performing a stabilizing cycle with the drive motor assembly; and

after completing the stabilizing cycle, advancing the drive motor assembly to obtain a subsequent seated state for the fluid reservoir.

5. The method of claim 4, wherein the subsequent seated state is identical to the initial seated state.

6. The method of claim 4, wherein performing the stabilizing cycle comprises:

advancing the drive motor assembly by a first amount; and

thereafter, rewinding the drive motor assembly by a second amount.