Patent ID: 6190359
Filing Date: 2001-02-20
Classification: A61M

Abstract:
A periodically refillable drug infusion device to be implanted within a living body, comprising:a drug fluid reservoir for receiving a supply of drug fluid;a spring force displacer for selectively controlling the egress of drug fluid from said drug fluid reservoir for delivery into said living body, said displacer including a bellow-like expandable chamber annealed so that the chamber in its natural state assumes a collapsed position, and in an expanded state the chamber tends toward its natural collapsed position under its own action; anda motor assembly, including a motor operatively coupled to a flywheel about which a first end of a cable having first and second ends is wrapped, said second end of said cable being attached to said bellows-like expandable chamber and wherein said motor assembly adjusts the position of the bellows-like expandable chamber as it relaxes from a first expanded state to a second more collapsed state to control the displacement of the fluid reservoir.