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US 11,684,712 B2Granted
Ambulatory infusion pumps and reservoir assemblies for use with same
AssigneeMedtronic MiniMed, Inc.
InventorsRoger E. Smith, Mogens Bach Rasmussen
Life of this patent
Estimating the term…
Abstract
Ambulatory infusion pumps, medicament reservoirs, and plungers, including both dynamic and static seals, plus related components, as well as component combinations and related methods.
Claims6
An infusion pump reservoir assembly, comprising:
- a medicament reservoir comprising a reservoir barrel with an inner surface;
- a plunger moveable within the medicament reservoir in a dispensing direction from a full position;
- and
- a static seal that engages a sealing surface of a rear surface of the plunger that faces in a direction opposite the dispensing direction when the plunger is in the full position, wherein the static seal establishes an interference fit with elastomeric deformation with respect to the sealing surface when the plunger is in the full position,
- wherein the plunger and static seal are respectively configured and positioned relative to one another such that the static seal is disengaged from the sealing surface of the rear surface of the plunger in response to movement of the plunger in the dispensing direction from the full position, an inner diameter of the static seal is smaller than an outer diameter of the sealing surface, and wherein the plunger defines an outer surface diameter that is greater than an outer diameter of the static seal.
2 more elements
A method, comprising:
- engaging, in a medicament reservoir assembly of an infusion pump, a static seal with a sealing surface of a rear surface of a plunger that faces in a direction opposite a dispensing direction when the plunger is in a full position, wherein the static seal establishes an interference fit with elastomeric deformation with respect to the sealing surface when the plunger is in the full position;
- and
- disengaging the static seal from the sealing surface in response to movement in the dispensing direction of the plunger within a reservoir barrel of the medicament reservoir assembly from the full position, wherein an inner diameter of the static seal is smaller than an outer diameter of the sealing surface, and wherein the plunger defines an outer surface diameter that is greater than an outer diameter of the static seal.
Dependencies are inferred from the claim text.