Pharmaceutical injection device

A pharmaceutical injection device, comprising:

• a cartridge holder to which a pharmaceutical cartridge is mounted;
• a main case to which the cartridge holder is provided openably and closeably;
• a piston that can be inserted into the pharmaceutical cartridge mounted to the cartridge holder;
• a driver that drives the piston to move in either an insertion direction in which the piston is inserted into the pharmaceutical cartridge, or a pull-out direction in which the piston is pulled out of the pharmaceutical cartridge;
• an opening component that opens the cartridge holder in conjunction with the movement of the piston in the pull-out direction;
• a cartridge holder detector that detects whether the cartridge holder is open or closed;
• a controller that controls the driver so as to stop the piston when the cartridge holder detector has detected that the cartridge holder is open;
• and
• a time measurement component that measures elapsed time since the pharmaceutical cartridge was mounted to the cartridge holder,
• wherein the controller moves the piston in the pull-out direction so as to operate the opening component if the elapsed time has reached a specific length of time.

A pharmaceutical injection device, comprising:

• a cartridge holder to which a pharmaceutical cartridge is mounted;
• a main case to which the cartridge holder is provided openably and closeably;
• a piston that can be inserted into the pharmaceutical cartridge mounted to the cartridge holder;
• a driver that drives the piston to move in either an insertion direction in which the piston is inserted into the pharmaceutical cartridge, or a pull-out direction in which the piston is pulled out of the pharmaceutical cartridge;
• an opening component that opens the cartridge holder in conjunction with the movement of the piston in the pull-out direction;
• a cartridge holder detector that detects whether the cartridge holder is open or closed;
• a controller that controls the driver so as to stop the piston when the cartridge holder detector has detected that the cartridge holder is open;
• an injection needle mounting component for mounting an injection needle that injects a pharmaceutical from the pharmaceutical cartridge into a body;
• an injection needle detector that detects the mounting of the injection needle to the injection needle mounting component;
• and
• a display component that is provided at the main case,
• wherein the controller displays on a display component a display prompting the user to remove the injection needle prior to the opening of the cartridge holder when the injection needle detector has detected the mounting of the injection needle.

A pharmaceutical injection device, comprising:

• a cartridge holder to which a pharmaceutical cartridge is mounted;
• an openable and closeable main case attached to the cartridge holder;
• a piston that can be inserted into the pharmaceutical cartridge mounted to the cartridge holder;
• a driver that drives the piston to move in either an insertion direction in which the piston is inserted into the pharmaceutical cartridge, or a pull-out direction in which the piston is pulled out of the pharmaceutical cartridge;
• an opening component that opens the cartridge holder in conjunction with the movement of the piston in the pull-out direction;
• an orientation sensor that senses an orientation of the main case;
• and
• a controller that operates the opening component to open the cartridge holder when the orientation sensor has sensed that the main case is in a specific orientation.