Force sensing resistor for liquid low-volume detection and occlusion sensing and methods and apparatuses for flow sensing along fluid path in fluid delivery device

An apparatus for sensing fluid communication in a wearable medicament delivery device having a fluid reservoir for containing a medicament, a fluid delivery mechanism for controlling delivery of the medicament from the reservoir to a patient, a processor, and a fluid path configured to fluidically connect the fluid reservoir with an outlet to the patient to transport the medicament from the fluid reservoir to the outlet under control of the fluid delivery mechanism, the apparatus comprising:

• a chamber disposed adjacent a portion of the fluid path and connected to the fluid path such that the fluid path is exposed within the chamber;
• and
• a pressure sensor having a sensing surface and an output portion electrically connected to the processor of the wearable medicament delivery device,
• wherein the chamber is dimensioned to receive the sensing surface, and the sensing surface is configured to detect pressure of the fluid in the fluid path and provide a sensed pressure output electrically to the processor via the output portion.