Disinfection cap for IV needleless connectors

A method of capping a medical device connector, wherein

• a cap comprises
• a first start thread path having a first major profile, a first minor profile, a first pitch, and a first thread section profile,
• at least a second start thread path having a second major profile, a second minor profile, a second pitch, and a second thread section profile, and
• an inner cavity comprising an inner surface having the first and second start thread paths, a closed end, and an open end opposite the closed end comprising an opening,
• the first thread section profile and the second thread section profile being different,
• a medical device connector comprises a complimentary male thread having a third major profile with a uniform outer diameter, a third minor profile, and a third pitch substantially equivalent to the first pitch, and
• the first and second start thread paths are configured to interface with the complimentary male thread,
• the method comprising:
• engaging the complimentary male thread of the medical device connector by at least the first start thread path contacting the third major profile,
• thereby forming a first airflow path from a proximal end of the cap to the inner cavity via a first helical void formed by the space enclosed by the first start thread path of the cap and at least one of the third major profile and the third minor profile of the complimentary male thread of the medical device connector.