Single-Use Lancet Safety Mechanism Preventing Re-Use
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Solution Overview
Problem
Existing single-use lancet devices and integrated lancet and test strip devices lack effective safety mechanisms to prevent re-use, leading to potential accidental skin punctures with contaminated lancets.
Innovation Solution
A safety lancet system combining a single-use lancet assembly with a re-use prevention component and a multi-use lancet driver assembly, where the re-use prevention component, such as a cocking tab or rotating drive wing, ensures the lancet cannot be re-extended into a piercing orientation after initial use, preventing re-use by removing the necessary cocking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single-use lancet devices are designed without re-use prevention mechanisms, then device simplicity and ease of manufacture are improved, but safety and reliability deteriorate due to potential accidental re-use with contaminated lancets
Solution Approach 1:
The lancet is pre-cocked during assembly with the spring already compressed and locked in place. The safety cap serves dual purposes: protecting the needle and acting as a pushrod for arming. This preliminary preparation eliminates the need for user cocking while ensuring the lancet is ready for immediate single use, preventing any opportunity for re-use
Solution Approach 2:
The entire lancet device is designed as a disposable single-use unit. After one use, the complete device including housing, lancet, and spring assembly is discarded. This eliminates any possibility of re-use while keeping the device simple and cost-effective for its intended single application
2Reliability
If re-use prevention mechanisms are added to single-use lancet devices, then safety and reliability are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The safety cap and arming mechanism are merged into a single integrated component. The safety cap simultaneously protects the needle and functions as a pushrod that, when removed, arms the spring-loaded lancet mechanism. This consolidation prevents re-use while avoiding additional complex components
Solution Approach 2:
The spring serves multiple functions: it provides the driving force for lancet ejection, maintains tension for immediate deployment, and its pre-compressed state acts as a barrier to re-use. The housing also serves dual purposes of containing the mechanism and preventing re-cocking attempts. This multi-functionality reduces the need for separate re-use prevention components
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
The system effectively prevents re-use of the lancet, ensuring safe and single-use operation, thereby reducing the risk of accidental skin punctures and maintaining sterility.
Implementation Method 1
a lancet driver structured to propel the lancet forward to puncture the skin
Implementation Method 2
The needle is driven into the patient's skin by a small spring that is cocked by a technician or user prior to use
Implementation Method 3
a rotating drive wing ensures the lancet cannot be re-extended into a piercing orientation after initial use
Data Source
AI summary
A single-use lancet cartridge for inserting into a multi-use lancet driver assembly of a meter housing includes an elongated lancet housing with an open end, a lancet within the lancet housing and movable between a retracted and resting orientation to a piercing orientation through the open end, and a re-use prevention component that is a rotated drive wing incorporated within the lancet cartridge and oriented to cooperatively engage with a driver piston of the multi-use lancet driver assembly only one time thereby preventing the lancet from being moved into a piercing orientation a second time.