Contact Activated Incision Device Cam Roller Mechanism
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Solution Overview
Problem
Existing contact activated incision devices for drawing blood samples often lack uniformity in force application, require training, and are prone to accidental firing, with limited operating tolerances.
Innovation Solution
A contact activated incision device featuring a housing with a slider and rotatable roller mechanism, where a blade moves from a retracted to extended position and back, utilizing biasing means and cam surfaces to ensure consistent deployment and prevent accidental activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a contact activated lancet device is used, then the device is easy to use and requires little training, but the force applied to the patient's skin is not uniform and accidental firing may occur
Solution Approach 1:
The patent changes the geometric parameters of the cam surface and roller interaction to transform the relationship between slider displacement and blade extension. By designing a specific cam profile, the device converts linear slider movement into controlled blade rotation and extension, ensuring uniform force application regardless of variations in user pressing force or position.
Solution Approach 2:
The patent incorporates a spring-loaded mechanism that acts as a cushion between the user's finger and the blade extension system. This spring element absorbs excessive force and prevents accidental firing by requiring a specific threshold force to compress the spring enough to engage the cam-roller mechanism for blade deployment.
2Productivity
If a puncturing action is used in contact activated devices, then the device can provide an incision on the patient's skin, but the force applied may not be uniform and training is required
Solution Approach 1:
The patent designs the device to be self-regulating through the cam-roller-spring mechanism. The cam profile automatically controls the blade extension distance and force based on the slider's position, eliminating the need for user training on force application or depth control. The device performs the complex motion control automatically.
Solution Approach 2:
The patent replaces the direct mechanical linkage found in traditional lancets with a cam-based mechanical substitution system. Instead of a simple push-rod mechanism, the cam surface transforms the user's linear pressing motion into the complex rotational and linear motion required for reliable blade deployment and retraction, simplifying the user's task while maintaining precise mechanical control.
3Device complexity
If a simple trigger mechanism is used, then the device structure is simple, but accidental firing is more likely to occur
Solution Approach 1:
The patent uses a spring mechanism that must be pre-compressed to a specific threshold before blade extension can occur. This preliminary action requirement ensures that normal handling or accidental contact with the device surface will not trigger blade deployment, as the spring must be compressed beyond a designed threshold force to engage the cam-roller mechanism.
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 device provides consistent and easy-to-use blood sampling with wide operating tolerances, reducing the need for extensive training and minimizing accidental firings, ensuring reliable and uniform incisions.
Implementation Method 1
a first biasing means positioned between the housing and the slider, the first biasing means abutting the slider and biased towards the proximal end
Implementation Method 2
a second biasing means positioned between the roller and the blade assembly, the second biasing means abutting the blade assembly and biasing the blade assembly towards the retracted position
Data Source
AI summary
A contact activated incision device, comprises a housing defining a cavity, and a longitudinal axis extends between a proximal end and a distal end of the housing. A slider is slidable with respect to the housing along the longitudinal axis and at least partially positioned outside of the housing. A roller is mounted on the housing and rotatable about an axis perpendicular to the longitudinal axis. A blade assembly is mounted on the roller and has a blade, wherein the blade is movable from a retracted position to an extended position and to a final position, at the retracted position the blade is positioned in the cavity, at the extended position the blade extends at least partially beyond the proximal end of the housing, and at the final position the blade is positioned in the cavity.