In-Plane Si Microneedles: Fabrication, Characterization, Modeling and Applications

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Microneedles offer minimally invasive alternatives to hypodermic needles, with advancements since the 1990s.
• Various materials (silicon, polymers, metals) and designs (in-plane, out-of-plane) exist for biomedical applications.
• In-plane silicon microneedles are highlighted for their mechanical strength, biocompatibility, and CMOS-compatible fabrication.

Purpose of the Study:

• To provide a comprehensive review of in-plane silicon microneedle technology.
• To focus on fabrication methods, theoretical/numerical analysis, and experimental characterization.
• To discuss major applications, challenges, and future prospects of in-plane silicon microneedles.

Main Methods:

• Review of existing literature on in-plane silicon microneedle fabrication techniques.
• Analysis of theoretical and numerical studies on microneedle structural and fluidic behaviors.
• Summary of experimental characterization data for silicon microneedles.
• Compilation of major applications in drug delivery, diagnostics, and bio-sensing.

Main Results:

• In-plane silicon microneedles possess superior mechanical properties and biocompatibility.
• Fabrication techniques enable precise control over needle geometry and integration capabilities.
• CMOS compatibility facilitates scalable manufacturing and integration with electronics.
• Demonstrated efficacy in various biomedical applications, including drug delivery and diagnostics.

Conclusions:

• In-plane silicon microneedles represent a promising technology for advanced biomedical applications.
• Further research into fabrication optimization and application-specific designs is warranted.
• Addressing challenges will unlock the full potential of silicon microneedles for minimally invasive procedures.