| 摘要 |
An event recordal device 104, 301 for an inhaler 100, comprising a sensor (308), an antenna 310, 403 and a switching circuit (404, Fig 4), wherein the sensor 308 is arranged to 308 sense an actuation event i.e. a dose usage; the antenna 310,403 is configured to receive a query from a remote reader 302 and transmit a modulated response indicative of the query and at least one sensed event to the reader in response to the received query; and the switching circuit 404 is arranged to modulate the response during transmission from the antenna. In another aspect a reader 302 for use with the event recordal device comprising a receiver 401,312, and an excitation means (402, Fig 4) arranged to induce an alternating excitation signal in the antenna 310,403 of the event recordal device and the receiver 401,312, wherein the excitation means 402 is further configured to modulate the alternating excitation signal to communicate a query to the event recordal device. |
