Pharmaceutical Injection Device Inclination Sensor Mixing Control
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Solution Overview
Problem
Conventional pharmaceutical injection devices lack a means to confirm thorough mixing of solid and liquid pharmaceuticals before injection, risking incomplete mixing during the process.
Innovation Solution
Incorporating an orientation sensor and controller in the device to monitor the inclination angle of the main body case, ensuring that the device transitions to the next mixing mode only when the angle exceeds a specific value, thereby ensuring thorough mixing before proceeding with injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual mixing mode is used to dissolve and mix solid and liquid pharmaceuticals, then the pharmaceuticals can be mixed, but there is no means to check the mixing state, risking incomplete mixing
Solution Approach 1:
The patent applies feedback by using an orientation sensor to detect the inclination angle of the main body case and providing this information to the controller. The controller uses this feedback to determine when the device has been tilted sufficiently to ensure thorough mixing, automatically transitioning from manual mixing mode to air mixing mode only when mixing completeness is confirmed through the inclination angle feedback.
Solution Approach 2:
The patent replaces manual visual inspection of mixing state with an automated sensor-based detection system. The orientation sensor and controller substitute for human judgment, objectively measuring the inclination angle to determine whether thorough mixing has occurred, thereby eliminating the risk of incomplete mixing due to subjective assessment.
2Reliability
If the main body case is shaken to mix pharmaceuticals, then mixing is achieved, but it cannot be confirmed whether mixing is thorough
Solution Approach 1:
The patent replaces the difficult task of directly observing or measuring mixing state with a simpler mechanical measurement of inclination angle. By substituting direct mixing state detection with orientation sensing, the system indirectly verifies thorough mixing through the proxy measurement of device inclination, making detection feasible and reliable.
Solution Approach 2:
The patent introduces the inclination angle as an intermediary parameter to verify mixing completeness. Instead of directly measuring whether pharmaceuticals are thoroughly mixed, the system uses the inclination angle of the main body case as an intermediate indicator that correlates with mixing thoroughness, simplifying the detection process while maintaining reliability.
3Reliability
If no inclination monitoring is provided, then the device is simpler, but pharmaceutical injection may occur before thorough mixing
Solution Approach 1:
The patent implements feedback control where the orientation sensor continuously monitors the inclination angle and the controller adjusts the mixing mode based on this feedback. The system only transitions to air mixing mode when the inclination angle feedback confirms sufficient tilting has occurred, ensuring injection timing accuracy is maintained through automated feedback-based decision making.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures that pharmaceuticals are thoroughly mixed before injection, preventing incomplete mixing and enhancing the reliability of the injection process.
Implementation Method 1
an orientation sensor that senses the inclination angle of the main body case
Data Source
AI summary
This pharmaceutical injection device comprises a main body case (2); a pharmaceutical syringe mounting portion (3) provided inside the main body case (2); a piston (5) that is provided so as to be movable with respect to a pharmaceutical syringe (4) that is removably attached to the pharmaceutical syringe mounting portion (3); a drive mechanism (6) for driving the piston (5); a controller (7) that is electrically connected to the drive mechanism (6); and an acceleration sensor (8) that is connected to the controller (7). When a manual mixing mode of the pharmaceutical syringe (4) is selected, the controller (7) changes to the next step (air venting mode) if the inclination angle of the main body case (2) sensed by the acceleration sensor (8) is greater than a specific value.