Infusion pump system with disposable cartridge having pressure venting and pressure feedback

• US 9,211,377 B2
• Filed: 07/29/2010
• Issued: 12/15/2015
• Est. Priority Date: 07/30/2009
• Status: Active Grant

• Current Assignee: Tandem Diabetes Care Incorporated
• Original Assignee: Tandem Diabetes Care Incorporated
• Inventors: DiPerna, Paul M., Brown, David, Rosinko, Mike, Kincade, Dan, Michaud, Michael, Nadworny, John, Kruse, Geoffrey A., Ulrich, Thomas R.
• Primary Examiner(s): Eisenberg, Rebecca E
• Assistant Examiner(s): Lee, Morgan
• Application Number:
  US12/846,720
• Publication Number:
  US 20110152824A1
• Time in Patent Office: 1,965 Days
• Field of Search: 604/132, 604151-154
• US Class Current: 1/1
• CPC Class Codes: A61M 2005/14268 with a reusable and a disposable component
• CPC Class Codes: A61M 2205/3389 Continuous level detection A61M2205/3393 takes precedence
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/505 Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
• CPC Class Codes: A61M 2205/52 with memories providing a history of measured variating parameters of apparatus or patient
• CPC Class Codes: A61M 2230/201 Glucose concentration
• CPC Class Codes: A61M 2230/63 Motion, e.g. physical activity
• 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 5/14248 of the skin patch type
• CPC Class Codes: A61M 5/16804 Flow controllers
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• 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: A61M 5/31513 Piston constructions to improve sealing or sliding
• CPC Class Codes: F04B 43/113 the actuating fluid being controlled by at least one valve
• CPC Class Codes: F04B 53/143 Sealing provided on the piston
• CPC Class Codes: F16J 15/32 with elastic sealings, e.g. O-rings
• CPC Class Codes: F16J 15/56 Other sealings for reciprocating rods
• CPC Class Codes: G06F 3/0488 using a touch-screen or digitiser, e.g. input of commands through traced gestures
• CPC Class Codes: G16H 40/63 for local operation

Abstract

Embodiments are directed to portable infusion devices, systems, and methods of using the same for dispensing materials. In some cases, the devices, systems and methods may be used for infusing a material such as medicament, e.g., insulin, into a body in need thereof.

Claims

1. A delivery mechanism for an infusion pump comprising:

a bore disposed in a delivery mechanism body;

a spool disposed in the bore which is axially displaceable within the bore; and

a collapsible volume bounded by an outside surface of the spool, an inside surface of the bore, a first seal between the spool and the bore that is axially fixed relative to the spool but displaceable relative to an inside surface of the bore and a second seal between the spool and the inside surface of the bore which is configured to slide over a slide portion of the spool disposed in an aperture of the second seal, the second seal forming a substantially fluid tight but displaceable seal between an outside surface of the second seal and the inside surface of the bore and the second seal also forming a substantially fluid tight but displaceable seal between an outside surface of the slide portion and an inner surface of the second seal.

2. The mechanism of claim 1 wherein friction between the inside surface of the bore and the second seal is greater than friction between the outside surface of the slide portion of the spool and the aperture of the second seal.

3. The mechanism of claim 1 wherein the second seal comprises an o-ring.

4. The mechanism of claim 1 wherein the spool comprises an elongate cylindrical member having a transverse dimension of about 0.5 mm to about 10 mm.

5. The mechanism of claim 1, wherein at least one seal is always disposed between a reservoir inlet port and a dispense port so as to prevent a free flow condition to the dispense port from a reservoir.

6. An infusion pump for dispensing fluid to a patient, comprising:

a disposable fluid cartridge including;

a delivery mechanism including;

a delivery mechanism body,

a bore disposed in the delivery mechanism body including a distal end, a proximal end disposed towards a drive mechanism of the infusion pump, an interior volume, a reservoir inlet port, a fluid dispense port, a vent inlet port and a vent outlet port;

a spool slidingly disposed within the bore which is axially displaceable in the bore and which includes;

a collapsible first volume bounded by an outside surface of the spool, an inside surface of the bore, a first seal between the spool and the bore that is axially fixed relative to the spool but displaceable relative to an inside surface of the bore and a second seal between the spool and the inside surface of the bore which is configured to slide over a slide portion of the spool disposed in an aperture of the second seal, the second seal forming a substantially fluid tight but displaceable seal between an outside surface of the second seal and the inside surface of the bore and the second seal also forming a substantially fluid tight but displaceable seal between an outside surface of the slide portion and an inner surface of the second seal, and

a vent second volume which is positionable to overlap the vent inlet port and vent outlet port simultaneously and which is formed by a third seal around the spool, a fourth seal around the spool, an outside surface of the spool between the third and fourth seal and an inside surface of the bore between the third and fourth seal;

a collapsible fluid reservoir bounded by a flexible membrane and including an interior volume in fluid communication with the reservoir inlet port,

a substantially rigid shell disposed about the collapsible fluid reservoir with an interior volume that contains the collapsible fluid reservoir and a vented volume disposed between an outer surface of the flexible membrane and an interior surface of the rigid shell, the vent inlet port being in fluid communication with the vented volume.

7. The infusion pump of claim 6 further comprising a drive mechanism operatively coupled to the spool of the delivery mechanism.

8. The infusion pump of claim 7 further comprising a user interface configured to accommodate user data input regarding fluid delivery.

9. The infusion pump of claim 8 further comprising a controller having a processor and memory device operatively coupled to the drive mechanism.

10. The infusion pump of claim 9 further comprising a power cell operatively coupled to the controller, the GUI and the drive mechanism.

11. The infusion pump of claim 6 wherein at least one seal is always disposed between the reservoir inlet port and the dispense port so as to prevent a free flow condition to the dispense port from the reservoir.