Reciprocating pump
AssigneeBecton, Dickinson and Company
InventorJ. Richard GYORY
Life of this patent
Estimating the term…
Abstract
A pump suitable for use in a wearable medical device, such as a patch pump, comprises an axially translatable chamber with an inlet and an outlet, a piston or a diaphragm rotatably received in the chamber, a first valve between the inlet and the chamber, a second valve between the outlet and the chamber, a cam affixed to the chamber, a follower affixed to the piston and in contact with the cam for axially translating the chamber, and a biasing means acting on the chamber for applying a force on the chamber in an axial direction of the chamber to maintain such contact.
Claims12
A pump system for the pumping of a liquid, the pump system comprising:
- an axially translatable chamber having a cam surface, an inlet and an outlet;
- a piston received in the chamber, said piston fixed in an axial position relative to the pump system, said piston having a follower in contact with the cam surface for axially translating the chamber by rotation of said piston relative to said chamber, said follower being fixedly coupled to a piston rod, which is fixedly coupled to said piston;
- and
- where said chamber is biased in an axial direction to maintain contact between said follower and said cam surface of said chamber;
- and
- said piston covers an axial end of said post.
A pump system for the pumping of a liquid, the pump system comprising:
- an axially translatable chamber having a cam surface, an inlet valve and an outlet valve;
- one of a piston and a diaphragm received in the chamber and forming an axial barrier across an axial opening of said chamber;
- a follower fixedly coupled to a post, which is fixedly coupled to the one of the piston and the diaphragm and in contact with the cam surface for axially translating the chamber by rotation of said follower relative to said chamber, the one of the piston and the diaphragm covering an axial end of the post;
- and
- where said chamber is biased in an axial direction of the chamber with respect to the pump system to maintain contact between the follower and the cam surface of the chamber.
A pump system for the pumping of a liquid, the pump system comprising:
- an axially translatable chamber having a cam surface, an inlet valve and an outlet valve;
- one of a piston and a diaphragm received in the chamber and forming an axial barrier across an axial opening of said chamber;
- and
- a follower fixedly coupled to a post, which is fixedly coupled to the one of the piston and the diaphragm and in contact with the cam surface for axially translating the chamber by rotation of the follower relative to the chamber;
- wherein the chamber is biased in an axial direction of the chamber with respect to the pump system to maintain contact between the follower and the cam surface of the chamber, and the one of the piston and the diaphragm lies in a plane substantially perpendicular to an axis of rotation of the follower.
Dependencies are inferred from the claim text.