The invention relates to an access system P for a medical treatment device, in particular an extracorporeal blood treatment apparatus 1. The invention also relates to a medical treatment device, in particular an extracorporeal blood treatment apparatus 1, comprising such an access system P. The access system according to the invention has a housing body 20 which comprises an outer housing part 21 that is hollow on the inside and that is formed a connection piece 26 for connecting a closure part 36 for the fluid-tight closure of the access system or for connecting a connector 27. The access system is characterised in that a UV irradiation unit 30 is provided for emitting ultraviolet light, which comprises a plurality of UV light-emitting diodes 32 emitting ultraviolet light or an annular UV fluorescent tube, the outer housing part 21 having a region which is permeable to ultraviolet light. The UV light-emitting diodes 32 or the annular UV fluorescent tube are arranged in such a way that the ultraviolet light passes through the region of the outer housing part 21 that is permeable to ultraviolet light and enters the interior of the access system.

Hand held and portable disinfection units for use with patients having indwelling catheters or are hospitalized or under care in an intensive care unit.