Microneedle Test Device with Punch and Skin Model
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Solution Overview
Problem
There is a lack of standardized devices and methods for testing the application of microneedle systems, particularly for microneedle arrays, which complicates the evaluation of application parameters such as needle geometry, material, and skin interaction.
Innovation Solution
A test device and method that includes a microneedle receptacle, an application device with a skin model, a movement device with a punch for simulating application, and a sensor system to detect penetration depth and application force, allowing for standardized testing of microneedle systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual application methods are used for microneedles, then ease of operation is improved, but application precision and reliability deteriorate
Solution Approach 1:
An applicator device is introduced as an intermediary tool between the user and the microneedle array. The applicator includes a holder that secures the microneedle array and a punch that delivers controlled mechanical force to penetrate the skin uniformly, eliminating the inconsistency of manual finger pressure while maintaining ease of use.
Solution Approach 2:
The uncontrolled manual mechanical pressure applied by fingers is replaced with a designed mechanical system (applicator with punch) that provides standardized, reproducible force distribution. This mechanical substitution ensures consistent penetration depth and angle across all microneedles in the array.
2Ease of operation
If microneedles are pressed into skin manually, then application simplicity is improved, but application force control deteriorates
Solution Approach 1:
The applicator serves as a mediator that translates simple user action into controlled, measurable application force. The punch design and holder mechanism ensure that the force is distributed evenly across the microneedle array, providing force control without complicating the application process.
3Measurement precision
If standardized testing devices are implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The test device uses a skin model that copies the essential mechanical properties of real skin without requiring actual biological tissue. This phantom skin model provides reproducible, standardized testing conditions with controlled elasticity and resistance, achieving measurement precision without the complexity and variability of real skin samples.
Solution Approach 2:
The test device allows systematic variation of key parameters such as punch mass, drop height, and skin model properties to establish standardized testing conditions. By controlling and documenting these parameters, the device achieves reproducible measurements while maintaining a relatively simple structure.
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 safe and reliable application of microneedle systems by providing standardized testing parameters, ensuring proper design and function of applicators and minimizing complications during application.
Implementation Method 1
The movement device is in particular an acceleration device for the acceleration of the microneedle system
Implementation Method 2
The sensor device is configured to detect an application of the microneedle system into the skin model
Data Source
AI summary
Described is a test device for microneedle systems having a microneedle receptacle for receiving a microneedle system to be tested, an application device, and a movement device including a punch for the application in motion of the microneedle system to be tested in the application device. A test system with a test device of this kind is also described. Lastly, described is a method for testing a microneedle application.