Systems and methods for delivering a therapeutic agent

An apparatus, comprising:

• a housing removably couplable to a user;
• a reservoir configured to contain a fluid and disposed within the housing;
• an actuator having a constrained first end portion and an unconstrained second end portion;
• and
• a transfer structure disposed between the actuator and the reservoir, the transfer structure having a first end portion pivotably coupled to the housing and an unconstrained second end portion, the transfer structure having a surface configured to contact the reservoir upon actuation of the actuator,
• the actuator being configured such that when actuated, a force is exerted by the second end portion of the actuator onto the transfer structure and the unconstrained second end portion of the transfer structure pivots about a pivot location and exerts a force on the reservoir such that fluid within the reservoir is communicated out of the reservoir.

An apparatus, comprising:

• a housing removably couplable to a user;
• a reservoir configured to contain a fluid and disposed within the housing;
• an actuator having a constrained first end portion and an unconstrained second end portion;
• a transfer structure disposed between the actuator and the reservoir,
• the actuator being configured so that when actuated, a first force is exerted by the actuator onto the transfer structure;
• and
• a spring coupled to the transfer structure, the spring configured to exert a second force onto the transfer structure, the first force and the second force collectively configured to cause the transfer structure to exert a force on the reservoir such that fluid within the reservoir is communicated out of the reservoir.