Medical disinfection device with visible disinfection indicator

A disinfection cap for medical devices, comprising:

• an external housing having a proximal end and a disinfection cavity in an open distal end thereof;
• an inner housing within the disinfection cavity, rotatable about a first rotation axis, the inner housing having an open distal end in communication with the open distal end of the external housing and a proximal end;
• and
• a disinfection medium within the inner housing
• a collar rotatively coupled to the proximal end of the external housing about a second rotation axis that is coaxial with the first rotation axis;
• a shaft, coaxial with the first and second rotation axes, coupled to the proximal end of the inner housing and the collar;
• a visualization chamber defined within the proximal end of the external housing and an interior surface of the collar, and viewable outside the collar;
• first and second chambers within the visualization chamber, respectively containing respective first and second different colored fluids;
• a membrane interposed between and isolating the first and second chambers from each other;
• and
• a mixer within the visualization chamber, coupled to the interior surface of the collar, the mixer disrupting the membrane upon rotation of the collar and causing the respective first and second different colored fluids to mix with each other, wherein rotation of the collar mixes the respective first and second different colored fluids and changes them to a third color visible outside the external housing.