Chen K, Pan M, Feng ZG. Modeling of Drug Delivery by A Pump Driven Micro-Needle Array System.
Open Biomed Eng J 2016;
10:19-33. [PMID:
27347217 PMCID:
PMC4901197 DOI:
10.2174/1874120701610010019]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 02/13/2016] [Accepted: 02/17/2016] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND
Micro-needles were proposed as one of the alternatives to deliver drugs painlessly passing through stratum corneum in recent years. In this work, a mathematical model is presented to characterize the in fusion flow of a hollow micro-needle array driven by a micro-pump.
METHODS
By assuming the injection of each micro-needle undergoes a spherical expansion and diffusion, the model is able to calculate the time-varying expansion radius, and the diffusion boundary, provided that the material properties and the micro-needle system parameters are known.
RESULTS AND CONCLUSION
The calculation results show that the expansion caused by the infusion of micro-needles stops and the flow rate drops to zero in a short time. However, the diffusion boundary is much bigger than the expansion and the infusion continues if the surrounding material is absorptive. The experimental results of jet infusion through a single needle in silicon rubber and polyacrylamide gel agree with the calculation results qualitatively.
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