Blood Sampling Device Trigger Safety Mechanism
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Solution Overview
Problem
Existing blood sampling devices with manually actuated triggers risk accidental activation before the removable needle cap is fully removed, leading to potential malfunctions if users do not follow instructions correctly.
Innovation Solution
A blood sampling device design where the trigger mechanism is blocked in its fire position until the safety cap is removed, featuring a lancet body with an initial position that moves to an intermediate position upon cap removal, allowing the lancet to be urged forward by a spring only when the cap is fully off, preventing accidental triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manually actuated trigger is employed to force the needle tip into the skin, then the device can be activated by user action, but the risk of accidental triggering increases before the cap is removed
Solution Approach 1:
The patent applies preliminary action by requiring the cap to be removed before the trigger mechanism can be activated. The cap removal action must occur first, which then enables the trigger mechanism to function. This sequence prevents accidental triggering because the trigger is mechanically blocked until the cap is properly removed, ensuring that preparation steps are completed before activation is possible.
Solution Approach 2:
The patent uses an intermediary mechanism (the cap and its interaction with the trigger mechanism) to mediate between the user's action and the lancet activation. The cap serves as an intermediary element that must be removed to enable trigger operation, creating a safety barrier that prevents direct activation without proper preparation. This intermediary step ensures that the trigger mechanism cannot be activated unless the cap removal condition is met.
2Ease of operation
If instructions are provided to twist the cap off, then proper removal is guided, but users may force the cap off in a way that causes malfunction
Solution Approach 1:
The patent applies dynamics by designing the cap removal mechanism to transition from a restricted state to an enabled state. The trigger mechanism is dynamically blocked during cap attachment and becomes dynamically enabled after cap removal. This dynamic state change ensures that the system adapts its responsiveness based on the preparation status, allowing activation only when properly prepared while preventing malfunction from forced removal attempts.
3Reliability
If the trigger mechanism is blocked until cap removal, then accidental activation is prevented, but the device complexity increases
Solution Approach 1:
The patent merges the cap removal function with the trigger enablement function into a single integrated mechanism. Rather than adding a separate blocking mechanism, the cap itself serves as the blocking element through its interaction with the trigger mechanism. This merging approach prevents accidental activation while minimizing additional complexity by using existing components in a multi-functional arrangement.
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 ensures the device cannot be triggered until the safety cap is completely removed, reducing the risk of accidental activation and ensuring safe and proper use by preventing premature lancet movement.
Implementation Method 1
a spring or the like which forces a needle tip into the skin following triggering of the device
Data Source
AI summary
A blood sampling device includes a housing and a lancet supporting a lancet needle or tip, the lancet and needle being urged or urgeable in a pricking direction. A trigger mechanism is moveable to a fire position for releasing the lancet to travel in the pricking direction. A removable safety cap initially covers the lancet needle. The lancet has an initial position in which movement of the trigger mechanism to its fire position is blocked and an intermediate position in which the trigger mechanism may be moved to its fire position. The intermediate position is obtainable only on removal of the safety cap.