Two-Dose Autoinjector Stepped Guide Mechanism
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Solution Overview
Problem
Current autoinjector devices for medicament administration are complex and require manual operations for administering successive doses, posing safety risks and manufacturing challenges for user-friendly and efficient two-dose delivery.
Innovation Solution
The autoinjector employs stepped guide means with ramps and a pivotable slide mechanism, allowing axial sliding of the syringe assembly with spring-driven control for automatic delivery of two doses by aligning ramps and guide tracks through angular arming displacements, enabling easy operation and manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual operations are required for administering successive doses, then device functionality is achieved, but user safety decreases and operation complexity increases
Solution Approach 1:
The device automatically administers the second dose without requiring manual re-arming or operation by the user. The system self-triggers the second injection through an automatic triggering mechanism that activates after the first dose is administered, eliminating the need for user intervention and reducing operational complexity while maintaining safety
Solution Approach 2:
The device incorporates a triggering mechanism that detects the completion of the first dose administration and automatically initiates the second dose. This feedback-based automatic triggering ensures that the second dose is administered at the correct time interval without requiring user judgment or manual operation
2Productivity
If complex mechanisms are used for two-dose delivery, then dose control is achieved, but device complexity increases and manufacturing difficulty increases
Solution Approach 1:
The patent combines the arming and triggering functions into a single integrated mechanism. The same mechanical structure that arms the device for the first dose also automatically triggers the second dose, eliminating the need for separate complex mechanisms for each dose and reducing overall device complexity while maintaining efficient dose delivery
Solution Approach 2:
The triggering mechanism serves multiple functions: it detects the completion of the first dose, controls the timing interval, and automatically initiates the second dose. This multi-functional design reduces the number of separate components needed and simplifies the overall device structure while ensuring efficient two-dose delivery
3Ease of operation
If automatic triggering mechanism is implemented, then ease of operation improves, but device complexity increases
Solution Approach 1:
The automatic triggering mechanism operates autonomously without requiring user input or control. The system self-regulates the timing and execution of the second dose based on detection of the first dose completion, providing user-friendly automatic operation while keeping the triggering mechanism relatively simple through self-service functionality
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
Facilitates user-friendly, automatic administration of two successive medicament doses with reduced complexity and manufacturing costs, ensuring safe and efficient delivery of medicaments like epinephrine, enhancing patient safety and ease of use.
Implementation Method 1
spring drive means engage with a piston rod and, once they are armed, retain the rod in a first position, while, when they are triggered, cause the rod to move forward
Data Source
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AI summary
A two-dose autoinjector for a medicament wherein the locking and releasing of the drive spring (27) of the autoinjector is controlled through stepped guide means (16, 24) with ramps for two successive slidings therealong of slide means (28, 29) operated by the spring and connected with the syringe (21) and relevant plunger (26). The guide means and the slide means are pivotable relative to one another and the sliding direction, while the syringe can only slide axially, and the triggering control for each sliding is obtained by pressing a trigger (30), axially slidable relative to a stationary member (1), against the patient's skin to push the slide means first into one ramp and then into the other ramp of the guide means. To enable or disable the sliding of the slide means within the guide means a angularly mobile arming member (11) is provided formed with a guide track (14) substantially equal to that of the stationary member where the guide means are formed. Following two subsequent angular arming displacements of the mobile member relative to the stationary member the ramps and the guide track are radially aligned to enable the slide means to slide under the action of the spring and therefore deliver the first dose and then the second dose.