On-Body Injector Activation Mechanism With Lower Button Force
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Solution Overview
Problem
Existing on-body medicament delivery devices require an axially aligned needle design and high activation force, limiting design freedom and user convenience.
Innovation Solution
An activation mechanism with a linearly movable activation pin and button structure, allowing for a flexible delivery member location and reduced activation force, featuring a biased activation pin that transitions from a retracted to an extended position, triggering the delivery member's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the needle is axially aligned with the button axis, then the activation mechanism is simple, but the activation force required is high and design flexibility is limited
Solution Approach 1:
The patent changes the activation mechanism from axial alignment (one-dimensional) to perpendicular alignment (introducing a second dimension). The button moves perpendicular to the needle axis, and the activation pin translates from axial to radial direction relative to the button, enabling compact design with reduced activation force through geometric advantage
Solution Approach 2:
The activation pin serves as an intermediary element between the button and the needle/delivery member. It converts the perpendicular button motion into linear motion that pushes the delivery member, decoupling the button axis from the needle axis and enabling flexible design with reduced force requirements
2Device complexity
If the activation button structure uses a biased button design, then the activation mechanism is compact, but the activation force required is high
Solution Approach 1:
The button motion is changed from axial (along needle axis) to perpendicular (transverse to needle axis). This dimensional change allows the use of a biased button for compactness while the perpendicular geometry provides mechanical advantage that reduces the activation force required
3Reliability
If the activation pin is held in retracted position by button engagement, then sterility is maintained, but design flexibility for needle placement is limited
Solution Approach 1:
The activation pin acts as an intermediary that can be held in place by button engagement to maintain sterility, yet its perpendicular translation mechanism provides freedom in needle placement design. The pin sleeve guides the pin's radial motion independently of the needle axis, enabling flexible needle positioning while maintaining the sterile barrier until activation
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
Enables design flexibility for the delivery member's location and reduces the activation force required, enhancing user convenience and functionality.
Implementation Method 1
a biased activation pin received by the activation pin sleeve, the activation pin being configured to be linearly movable from an initial retracted position relative to the activation pin sleeve to an extended position towards which the activation pin is biased
Data Source
AI summary
An activation mechanism for an on-body medicament delivery device, wherein the activation mechanism comprises: an activation button structure configured to be moved between an initial position and an activation position, an activation pin sleeve, and a biased activation pin received by the activation pin sleeve, the activation pin being configured to be linearly movable from an initial retracted position relative to the activation pin sleeve to an extended position towards which the activation pin is biased, the activation button structure being configured to interact with the activation pin sleeve in the initial position to cause the activation pin sleeve to engage with and maintain the activation pin in the retracted position, and wherein the activation button structure is configured to interact with the activation pin sleeve when the activation button structure is moved linearly towards the activation position causing the activation pin sleeve to release the activation pin from the retracted position.