Infusion pump system with disposable cartridge having pressure venting and pressure feedback
First Claim
Patent Images
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.
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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.
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Citations
11 Claims
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1. A delivery mechanism for an infusion pump comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. An infusion pump for dispensing fluid to a patient, comprising:
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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. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification