Annals of Biomedical Engineering

, Volume 46, Issue 12, pp 2012–2022 | Cite as

Optimal Design of Needle Array for Effective Drug Delivery

  • Hanwook Park
  • Hyejeong Kim
  • Sang Joon LeeEmail author


Recently, the multi-needle drug injection has been adopted to overcome the shortcomes of conventional single-needle injection, enhancing the efficiency of drug delivery. However, the effect of needle array on the efficacy of drug delivery has not been fully elucidated. In this study, the interactions of drug analogous solution injected from a pair of needles were analyzed to examine the design criteria of effective multi-needle devices for drug delivery. Temporal and spatial variations of relative contents of the solution in the tissues were compared according to the distance between two adjacent needles (DN). As the DN increases from 5 to 20 D, where D is the needle diameter, the solution from each needle encounters 3.5 times faster, and 4.22 times more solution was accumulated. At the same time, the effective spreading area was continuously increased from 54.2 to 177.8 mm2 and RCS gradient decreases from 0.087 to 0.037, due to the overlapping effect of the spreading solution from neighboring needles. Finally, based on the experimental results, an optimal design criterion of needle array for effective drug delivery was proposed. The present results would be helpful in the design of multi-needle injection devices and eventually offer advantage to patients with effective drug delivery.


Drug injection Multi-needle injection X-ray imaging Diffusion 



This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2017R1A2B3005415).

Competing financial interests

The authors declare no competing financial interests.

Author contributions

HP, HK and SJL proposed the study. HP and HK performed the experiment and they processed the captured images and analyzed the experimental data. All authors discussed the results and participated in completing the manuscript.


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Copyright information

© Biomedical Engineering Society 2018

Authors and Affiliations

  1. 1.Center for Biofluid and Biomimic Research, Pohang University of Science and Technology (POSTECH)PohangSouth Korea
  2. 2.Department of Mechanical EngineeringPohang University of Science and Technology (POSTECH)PohangSouth Korea

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