Optimal Design of Needle Array for Effective Drug Delivery

Area of Science:

• Biomedical Engineering
• Drug Delivery Systems
• Fluid Dynamics in Biological Tissues

Background:

• Conventional single-needle injections have limitations in drug delivery efficiency.
• Multi-needle injection devices offer potential advantages but require optimized design.
• The impact of needle array configuration on drug delivery efficacy remains under-investigated.

Purpose of the Study:

• To analyze the interactions of drug solutions injected from multiple needles.
• To establish design criteria for effective multi-needle drug delivery devices.
• To investigate the influence of needle spacing on drug distribution within tissues.

Main Methods:

• Simulated drug-analogous solution injection from a pair of needles.
• Comparison of temporal and spatial variations in solution content based on needle distance (DN).
• Analysis of solution accumulation, spreading area, and concentration gradients.

Main Results:

• Increasing needle distance (DN) from 5 to 20 times the needle diameter (D) accelerated solution encounter rates by 3.5 times.
• Solution accumulation increased by 4.22 times with greater DN.
• Effective spreading area expanded from 54.2 to 177.8 mm², and the relative concentration (RCS) gradient decreased, indicating enhanced overlap and distribution.

Conclusions:

• Optimal needle spacing in multi-needle arrays significantly enhances drug delivery efficiency.
• The study proposes design criteria for multi-needle injection devices based on experimental findings.
• These findings can lead to improved patient outcomes through more effective drug administration.