Low-friction rolling plunger for a wearable drug delivery device
AssigneeInsulet Corporation
InventorsSoroush Kamrava, Daniel Allis
Life of this patent
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Abstract
Disclosed herein are various embodiments of a pump mechanism comprising a rigid structure having an open end and a closed end, a plunger disposed in the open end of the rigid structure, and a flexible, fluid-proof sheet of material attached to an inner wall of the rigid structure and bonded to the head of the plunger such as to form a fluid barrier between the interior of the rigid structure and the plunger. Movement of the plunger toward the closed end of the rigid structure causes a rolling corner to be formed between the head of the plunger and the rigid structure and a fluid contained within the pump chamber to be forced out of the pump chamber via a fluid port defined in the closed end of the rigid structure.
Claims17
A wearable medicament delivery device comprising:
- a housing;
- an adhesive configured to secure the housing to a skin of a user;
- a reservoir configured to hold a medicament;
- and
- a pump comprising:
- a rigid structure having an open end and a closed end defining a fluid port;
- a flexible sheet attached to the rigid structure;
- a plunger, disposed in the open end of the rigid structure;
- a drive mechanism;
- and
- a linkage configured to cause a linear translation of the plunger within the rigid structure,
- wherein the flexible sheet is bonded to a head portion of the plunger.
A wearable medicament delivery device comprising:
- a housing;
- an adhesive configured to secure the housing to a skin of a user;
- a reservoir configured to hold a medicament;
- and
- a pump comprising:
- a rigid structure having an open end and a closed end defining a fluid port;
- a flexible sheet attached to an inner surface of the rigid structure;
- a plunger, disposed in the open end of the rigid structure;
- a motor;
- and
- a linkage connected to the motor and configured to cause a linear translation of the plunger within the rigid structure,
- wherein the flexible sheet is bonded to a head portion of the plunger.
Dependencies are inferred from the claim text.