Patent ID: 8894611
Filing Date: 2014-11-25
Classification: A61M

Abstract:
1. A medical injection pen for introducing a drug into the body of a subject user, the medical injection pen comprising: a medicament filled cartridge comprising a piercable sealing member and a slidably mounted piston, a delivery mechanism including an actuator for the dispensing of drug responsive to activation of the actuator, and a time delay indicator adapted to change from a first visual state prior to activation of the actuator to a second visual state responsive to activation of the actuator, and to change to a third visual state after lapse of a pre-defined time interval subsequent to activation of the actuator, wherein the time delay indicator comprises a mechanical time delay device which is started responsive to activation of the actuator and which operates until lapse of said pre-defined time interval, the visual state of the time delay indicator being controlled by the mechanical time delay device, wherein the mechanical time delay device comprises; wherein the pre-defined time delay is longer than 30 minutes, wherein the first part and the second part are adapted to move continuously or intermittently relative to each other during lapse of said pre-defined time interval, wherein a variable sized chamber adapted to contain a flowable medium is coupled between the first part and the second part, the variable sized chamber being closed by a flow control structure for controlling the rate of flow of the flowable medium through the flow control structure into and/or out of the variable sized chamber, and wherein a biasing mechanism is adapted to operate the time delay device during lapse of a pre-defined time interval by exerting a force to expand or reduce the variable sized chamber.