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Systems for fluid delivery with wicking membrane

  • US 10,449,306 B2
  • Filed: 11/25/2015
  • Issued: 10/22/2019
  • Est. Priority Date: 11/25/2015
  • Status: Active Grant
First Claim
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1. A fluid infusion device, comprising:

  • a housing having a first chamber and a second chamber, with a seal that separates the first chamber from the second chamber, and the seal defines an opening;

    a fluid reservoir removably received within the second chamber of the housing that defines a reservoir chamber to receive a fluid, the fluid reservoir including a first end and a second end, the first end having an open perimeter and the second end terminates in a port that includes an outlet, the fluid reservoir including a stopper disposed in the reservoir chamber that is movable from the first end to the second end to dispense the fluid through the outlet and the stopper has a distal stopper end opposite a proximal stopper end, with a counterbore defined through the distal stopper end, the fluid reservoir having a first pressure;

    a drive system received within the first chamber of the housing having a slide, a motor, a gear box and a drive screw, at least the gear box and the drive screw surrounded by the slide, the motor drives the gear box to rotate the drive screw, the slide including a plurality of threads defined on an interior surface that threadably engage threads of the drive screw such that a rotation of the drive screw by the gear box translates the slide through the opening of the seal into the second chamber, the slide received within the reservoir chamber through the first end of the fluid reservoir and translatable within the reservoir chamber, the slide having a projection received within the counterbore of the stopper and a shoulder that contacts the stopper to move the stopper from the first end to the second end to dispense the fluid into the outlet;

    a wicking membrane having a first surface in contact with the fluid and an opposite second surface, the second surface coupled to an interior surface of the fluid reservoir at the second end such that the wicking membrane completely covers the outlet to substantially prevent a flow of air into the outlet and the wicking membrane is spaced apart from the distal stopper end when the stopper is moved to the second end; and

    a reservoir cap removably coupled to the second chamber of the housing and including a connector needle received within the port downstream of the wicking membrane to define a fluid flow path from the fluid reservoir to a tubing, the tubing having a second pressure, the first pressure greater than the second pressure, and the difference between the first pressure and the second pressure cooperates with the wicking membrane to dispense the fluid through the outlet,wherein the stopper includes at least one friction element that contacts an interior surface of the fluid reservoir and the wicking membrane is coupled to the second end such that the at least one friction element is spaced apart from the wicking membrane when the stopper is moved to the second end.

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