Angled Tip Injection Device for Viscous Dermal Fillers
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Solution Overview
Problem
Conventional syringe/needle systems are inadequate for administering highly viscous dermal fillers, requiring high extrusion forces and lacking precision, especially when injecting fine gauge needles into the skin for cosmetic and medical procedures.
Innovation Solution
A handheld injection device with an adjustable angled tip and a control system that allows for the selection of a dilution ratio and adjustable injection speeds, enabling precise control over the injection of mixed fluids through a drive unit and a needle with a variable angle configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional syringe/needle system is used to inject highly viscous dermal fillers, then the injection can be performed with standard equipment, but high extrusion forces are required and precision is lacking
Solution Approach 1:
The patent changes the geometric parameters of the needle, specifically introducing an angled tip portion with angles between 15-45 degrees relative to the needle axis. This parameter change allows the needle to penetrate skin more effectively at varied angles while maintaining control, thereby reducing the extrusion force needed for highly viscous dermal fillers and improving injection precision
Solution Approach 2:
The needle assembly is designed to be detachable and interchangeable, allowing dynamic adjustment of needle characteristics based on specific injection requirements. This enables the system to adapt to different viscosity levels and injection sites, optimizing both precision and force requirements for each procedure
2Ease of operation
If a traditional syringe and needle combination is used, then the equipment is simple and widely available, but the needle must be applied at a shallow angle and precise control to a predetermined location is difficult
Solution Approach 1:
The needle is designed with a localized angled tip portion that differs from the straight shaft. This local quality change at the tip allows the needle to achieve precise angular penetration (15-45 degrees) while the rest of the needle maintains its structural integrity and connection to the syringe, improving placement control without excessive overall complexity
Solution Approach 2:
The needle assembly is segmented into a shaft portion and an angled tip portion, which can be separate components or integrated as a distinct geometric feature. This segmentation allows the angled tip to be optimized for precision penetration while the shaft maintains standard connection features, balancing control improvement with device simplicity
3Measurement precision
If fine gauge needles are used for injecting trace amounts of dermal filler with high precision, then the injection accuracy is improved, but the extrusion force required increases significantly
Solution Approach 1:
The angled tip geometry changes the effective penetration angle and contact area with the skin, allowing fine gauge needles to penetrate more efficiently at optimized angles. This parameter change reduces the resistance encountered during insertion, thereby lowering the extrusion force required to deliver trace amounts of highly viscous filler with high precision
Data Source
AI summary
In one embodiment, the handheld injection device includes a first housing having a first axis and a second housing having a second axis. In one embodiment, the second housing is configured to support a needle. In one embodiment, the first axis and a second axis form an adjustable angle between about 180 degrees and about 90 degrees.