Disinfecting cap for open female luer devices

A cap for removable attachment to an open female luer device, the cap comprising:

• a body comprising an opening, a bottom, and a chamber defined between the opening and the bottom;
• a wall of the chamber comprising a thread originating proximate the opening and extending into the chamber, wherein the male post is spaced from the wall and at least a portion of the thread having a height that increases as a function of increasing distance from the opening;
• a male post in the chamber projecting from the bottom towards the opening of the body, wherein the male post is spaced from the wall;
• a movable piston comprising:
• a central opening surrounding the male post;
• a top region extending from the central opening and comprising a sealing surface;
• and
• a flexible circumferential skirt extending laterally from the movable piston at an acute angle relative to the male post, wherein the skirt is a flange with a gap between the flange and the top region, wherein the flange is in slidable contact with the wall of the chamber;
• a liquid disinfectant in the chamber between the bottom of the body and the movable piston.

A disinfecting system comprising:

• an open female luer device having a lumen and an open distal end with a contacting surface surrounding the lumen;
• a cap comprising:
• a body comprising an opening, a bottom, and a chamber defined between the opening and the bottom;
• a wall of the chamber comprising a thread originating proximate the opening and extending into the chamber, wherein the male post is spaced from the wall and at least a portion of the thread having a height that increases as a function of increasing distance from the opening;
• a male post in the chamber projecting from the bottom towards the opening of the body, wherein the male post is spaced from the wall;
• a movable piston positioned about the male post;
• a liquid disinfectant in the chamber between the bottom of the body and the movable piston;
• wherein the contacting surface of the open female luer engages with the sealing surface of the moveable piston.

The disinfecting system of 16, wherein the movable piston comprises:

• a central opening with an interference fit surrounding the male post;
• a top region extending from the central opening and comprising a sealing surface;
• and
• a flexible circumferential skirt in slidable contact with the wall of the chamber.