Auto-injector Hinged Door Sliding Link Spring Priming
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Solution Overview
Problem
Existing auto-injectors lack an efficient mechanism for priming the drive spring, particularly when high force springs are required, making it difficult for users to operate the device effectively.
Innovation Solution
The auto-injector incorporates a hinged door with a slidable charging link that couples to the drive spring, allowing users to gain a mechanical advantage when priming the spring by opening and closing the door, thereby compressing the spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high force drive spring is used to ensure reliable syringe operation, then the reliability of syringe operation is improved, but the difficulty of priming the spring increases
Solution Approach 1:
The charging link is designed with a slidable connection that allows dynamic adjustment during door movement. As the hinged door opens and closes, the charging link slides along the spring guide to automatically compress the drive spring, transforming a static priming mechanism into a dynamic one that adapts to user input.
Solution Approach 2:
The charging link acts as an intermediary element between the hinged door and the drive spring. It transfers the mechanical motion from door movement to spring compression, enabling indirect priming that reduces the direct force requirement from the user while maintaining reliable spring loading.
2Ease of operation
If the charging link connection is made slidable to enable automatic spring compression, then the ease of priming is improved, but the device complexity increases
Solution Approach 1:
The slidable connection of the charging link serves multiple functions: it enables automatic spring compression during door movement, provides mechanical advantage, and maintains connection integrity throughout the priming cycle. This multi-functionality justifies the added complexity by eliminating the need for separate priming mechanisms.
Solution Approach 2:
The mechanism is designed to be self-servicing through the slidable charging link that automatically compresses the spring based on door movement. The system uses its own operational motion (door opening/closing) to perform the priming action without requiring external intervention or complex control systems.
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 design enables easier and more effective priming of the drive spring, even with high force springs, enhancing user convenience and ensuring reliable operation of the auto-injector.
Implementation Method 1
at least one drive spring configured on activation of the auto-injector to drive a plunger driver forward within the auto-injector to operate the syringe received within the auto-injector
Implementation Method 2
The hinged door provides a lever through which the user can gain a mechanical advantage when priming the drive spring
Implementation Method 3
The hinged door provides a lever through which the user can gain a mechanical advantage when priming the drive spring
Data Source
AI summary
An auto-injector for receiving and operating a syringe. The auto-injector includes a housing for receiving the syringe, the housing comprising a main body and a hinged door operable into an open position and a closed position. The syringe is receivable within the housing when the hinged door is in the open position. At least one charging link is connected between the main body and the hinged door, wherein a connection of the at least one charging link to the main body and/or a connection of the at least one charging link to the hinged door is a slidable connection configured to slide on opening and closing of the hinged door and configured to couple to at least one drive spring for priming of the at least one drive spring on the opening of the hinged door and/or the closing of the hinged door. The at least one drive spring is configured on activation of the auto-injector to drive a plunger driver forward within the auto-injector to operate the syringe received within the auto-injector.