Patent ID: 8743662

Claim:
A replaceable cap for a transdermal liquid dosing device comprising an elongate hollow generally tubular body with a first open end which can be placed over a front part of the dosing device from which the liquid is dosed and a second closed end opposite the first end, the cap being releasably received on the dosing device, wherein the cap body includes a cavity which houses a timer unit coupled to a switch, and a timer display unit which displays time counted by the timer unit on an outer surface of the body of the cap, wherein the switch is opened or closed by the presence of a surface of the front part of the dosing device when the cap is placed on the dosing device, and the switch is closed or opened when the cap is removed from the dosing device, the operation of the switch causing the timer unit to reset either immediately or after a predetermined period of time, the time since the timer unit was last reset thereby indicating the time that has elapsed since the dosing device was last used, and wherein the elongate hollow body of the cap includes two main parts that are of injection moulded plastic and that connect together to form the cap with the cavity being defined at least partly between the two main parts, and wherein the two main parts hold the timer unit and switch captive between them.