A Touch Sensor of a Drug Delivery Device or of a Drug Delivery Add-On Device

A touch sensor, comprising:

• a rigid element;
• a touch element arranged in relation to the rigid element such that a gap between at least one part of the rigid element and a flexible part of the touch element is provided;
• and
• at least one pressure sensitive element arranged in the gap between the at least one part of the rigid element and the flexible part of the touch element such that a pressure applied to the flexible part of the touch element deforms the flexible part to at least partly reduce the gap and at least partly transmit the applied pressure to the at least one pressure sensitive element;
• wherein the at least one pressure sensitive element is configured to generate an output signal upon detecting the pressure applied to the at least one pressure sensitive element, the generated output signal being provided for signaling that the flexible part of the touch element has been touched.

A drug delivery device comprising a touch sensor, wherein the touch sensor comprises:

• a rigid element;
• a touch element arranged in relation to the rigid element such that a gap between at least one part of the rigid element and a flexible part of the touch element is provided;
• and
• at least one pressure sensitive element arranged in the gap between the at least one part of the rigid element and the flexible part of the touch element such that a pressure applied to the flexible part of the touch element deforms the flexible part to at least partly reduce the gap and at least partly transmit the applied pressure to the at least one pressure sensitive element;
• wherein the at least one pressure sensitive element is configured to generate an output signal upon detecting the pressure applied to the at least one pressure sensitive element, the generated output signal being provided for signaling that the flexible part of the touch element has been touched.

A drug delivery add-on device comprising a touch sensor, wherein the touch sensor comprises:

• a rigid element;
• a touch element arranged in relation to the rigid element such that a gap between at least one part of the rigid element and a flexible part of the touch element is provided;
• and
• at least one pressure sensitive element arranged in the gap between the at least one part of the rigid element and the flexible part of the touch element such that a pressure applied to the flexible part of the touch element deforms the flexible part to at least partly reduce the gap and at least partly transmit the applied pressure to the at least one pressure sensitive element;
• wherein the at least one pressure sensitive element is configured to generate an output signal upon detecting the pressure applied to the at least one pressure sensitive element, the generated output signal being provided for signaling that the flexible part of the touch element has been touched.