Multi-Microneedle Fluid Injector with Selective Transfer Mechanism
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Solution Overview
Problem
Current fluid injectors using multi-microneedle devices face challenges in efficiently and reliably injecting fluids into skin tissue, as they often result in fluid leakage and prolonged injection times due to inadequate skin penetration and pressure control.
Innovation Solution
An operational instrument for a fluid injector with a multi-microneedle device that includes an outer cylinder and a selective transfer mechanism, allowing the microneedles to move between initial, first protrusion, and second protrusion positions, where the microneedles are retracted, protruded to a first distance, and then to a shorter second distance for fluid discharge, ensuring effective skin penetration and rapid fluid injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the microneedles are protruded to a longer distance to ensure skin penetration, then skin penetration reliability is improved, but fluid leakage increases and injection time prolongs
Solution Approach 1:
The microneedle device employs a dynamic positioning mechanism that moves the microneedles between different protrusion states (retracted, first protrusion position, second protrusion position) based on operational requirements. This dynamic adjustment allows the system to optimize between penetration reliability and injection efficiency by selecting the appropriate protrusion distance for each operational phase.
Solution Approach 2:
The injection process is divided into periodic stages with distinct microneedle positions: (1) retracted position for safe handling and positioning, (2) first protrusion position for skin penetration, and (3) second protrusion position for controlled fluid discharge. This periodic action prevents continuous protrusion that causes leakage while ensuring reliable penetration when needed.
2Object-generated harmful factors
If the microneedles are retracted completely to prevent fluid leakage, then fluid leakage is reduced, but skin penetration capability is lost
Solution Approach 1:
The system dynamically adjusts microneedle protrusion based on operational phase, transitioning between retracted state (preventing leakage) and protruded states (enabling penetration). This dynamic control resolves the contradiction by applying the appropriate protrusion level at the appropriate time rather than maintaining a fixed position.
Solution Approach 2:
The microneedles are protruded to the first position in advance to achieve skin penetration before fluid injection begins. This preliminary action ensures penetration capability is established while the microneedles remain at a controlled distance that prevents excessive fluid leakage during the subsequent injection phase.
3Device complexity
If a single protrusion position is used for both penetration and injection, then device complexity is reduced, but injection precision and control are compromised
Solution Approach 1:
While maintaining relatively simple device structure, the system implements dynamic positioning with multiple discrete protrusion positions. This allows the microneedles to be precisely positioned at different distances for different functions (penetration vs. injection) without requiring complex continuous adjustment mechanisms.
Solution Approach 2:
The microneedle positioning range is segmented into distinct positions (retracted, first protrusion, second protrusion) rather than allowing continuous adjustment. This segmentation provides sufficient precision for both penetration and injection functions while keeping the positioning mechanism simple and robust.
Data Source
AI summary
An operation tool for a fluid injector includes an outer cylinder having a housing extending from a first open end to a second open end, and a selective transfer mechanism provided on the outer cylinder. The selective transfer mechanism moves the fluid injector from an initial position to a first protrusion position and then to a second protrusion position in the housing of the outer cylinder. When the fluid injector is at the initial position, the multi-microneedle device has microneedles retracted from the first open end and positioned inside the housing, when the fluid injector is at the first protrusion position, the microneedles are protruded out to a first distance from the first open end, and when the fluid injector is at the second protrusion position, the microneedles are protruded out to a second distance from the first open end. The second distance is shorter than the first distance.