Hollow Microneedle Array for Mesotherapy Injection
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Solution Overview
Problem
Current mesotherapy devices using single needles connected to manual thumb pressure plungers are time-consuming, painful, and cause operator fatigue, and require frequent changes of needle array cartridges to adjust depth penetration.
Innovation Solution
A spring-loaded manual solution injector system with a multineedle array that connects to a standard luer syringe, featuring a soft polymer applicator and microneedle platform for direct mesotherapy treatment, allowing adjustable depth penetration and continuous fluid delivery through a lumen system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single needle connected to a manual thumb pressure plunger syringe is used for mesotherapy injection, then the device structure is simple, but the treatment time is long and operator fatigue occurs quickly
Solution Approach 1:
The single needle is segmented into a multineedle array with multiple injection points arranged in rows and columns. This allows simultaneous injection at multiple skin locations, dramatically increasing treatment speed while maintaining a relatively simple overall device structure that can still be attached to a standard syringe.
Solution Approach 2:
Multiple needle functions are merged into a single applicator head that can be attached to one syringe. The multineedle array combines multiple injection capabilities into one device, allowing the operator to treat multiple areas simultaneously without changing needles or syringes, thus reducing treatment time without proportionally increasing device complexity.
2Device complexity
If a single needle is used for mesotherapy injection, then the device structure is simple, but the injection process is painful
Solution Approach 1:
The injection process is segmented across multiple needles that can be inserted into the skin simultaneously or in rapid succession. This distributes the painful stimulus across multiple small punctures rather than requiring repeated insertions of a single needle, reducing overall pain perception while keeping the device structure simple.
Solution Approach 2:
The multineedle array enables continuous injection across multiple skin locations without requiring the operator to withdraw and reinsert the needle between sites. This continuous action reduces the number of painful insertions while maintaining simple device operation, as the entire array can be pressed against the skin and activated sequentially or simultaneously.
3Extent of automation
If needle array cartridges with fixed needle length are used in meso gun devices, then automatic injection is achieved, but frequent needle changes are required to adjust penetration depth
Solution Approach 1:
The needle array is designed with adjustable penetration depth capability, allowing the same multineedle array to be used for different treatment depths by adjusting the applicator pressure or angle. This dynamic adjustment eliminates the need for frequent needle changes while maintaining automated or semi-automated injection functionality, reducing time loss without sacrificing automation benefits.
Solution Approach 2:
The multineedle array is designed to be universally applicable for multiple injection depths and angles, functioning as a multi-functional device that can adapt to different treatment requirements. This universal design allows a single array to replace multiple fixed-depth cartridges, eliminating needle change time while preserving automated injection capabilities through compatibility with standard syringes and applicators.
4Productivity
If a multineedle array is used for mesotherapy injection, then treatment speed increases, but device complexity increases
Solution Approach 1:
Multiple needle functions are merged into a single applicator head that attaches to a standard syringe, combining the complexity of a multineedle array with the simplicity of conventional syringe operation. This merging achieves high treatment speed through simultaneous multi-point injection while avoiding the need for complex automated injection mechanisms, thus increasing productivity without proportionally increasing device complexity.
Solution Approach 2:
The multineedle array is designed with universal compatibility with standard luer-lock syringes and applicators, allowing it to function with simple, widely-available components rather than requiring proprietary complex systems. This universal design enables high treatment speed through multiple injection points while maintaining simple device structure by leveraging existing standard medical components.
Data Source
AI summary
A soft tip applicator attaches to a syringe for spreading expressed liquid from the syringe onto a surface, such as skin. A detachable hollow microneedle assembly supports transdermal injection of syringe contents.