Showing 5 results for Microneedle
Behnaz Shojaedin Givi, Ali Khamesipour, Hossein Naderimanesh,
Volume 10, Issue 2 (8-2019)
Abstract
Background and Aim: Drug delivery through the microneedle array has been considered as an easy and non-invasive method in recent years. The purpose of this study was to design and construct an array of biodegradable polymeric microneedles containing Amphotericin-B to introduce this system and its use in the treatment of cutaneous lesions caused by Leishmania major parasite inoculation as a model in skin infections.
Methods: In this study, microneedles were fabricated by three-step molding method, which included master mold making, polymeric matrix that blending of polyvinyl pyrrolidine and methacrylic acid and finally casting.
Results: The identification of Amphotericin-B in polymeric microscopic compositions was investigated by absorption and emission spectroscopy. Also, the mechanical strength of microneedles, which confirms their ability to penetrate the skin, was investigated by a transducer.
Conclusion: In this study, the design and fabrication of a skin-permeable polymeric microneedle array with biodegradability and biocompatibility characteristics in physiological environment was performed. Using the properties of designed needles, loading of Amphotericin-B was used for the treatment of leishmaniasis and skin fungal infections.
Atefeh Naeimifar, Saman Ahmad Nasrollahi,
Volume 12, Issue 2 (8-2021)
Abstract
Microneedles consist of micron-sized projections similar to needles. They are capable of piercing through the stratum corneum and increase the permeation of active ingredients. Besides active pharmaceutical ingredients, microneedles can also deliver cosmetic agents, biotherapeutics like insulin and vaccines and also are used in diagnostic purposes. This article examines the types of microneedles. It also describes the function, classification, and differences between them.
, ,
Volume 12, Issue 3 (11-2021)
Abstract
Background and Aim: Microneedle technology has led to huge changes in the field of drug delivery medicine. Using microneedles, the drug can be injected locally, painlessly, and in very low and controlled doses with high precision. Local drug delivery through the skin with microneedles has many advantages over other methods of drug delivery. In this method, the drug does not enter the gastrointestinal tract and blood circulation, and therefore non-target organs are protected from the side effects of the drug. The present study is designed to construct an array of micron needles using the lithography method.
Methods: In this study, a silicon microneedle array is fabricated using the photolithography method with proper adjusting of the effective parameters. The constructed microneedle array has 256 needles with a height of 500 microns, a base diameter of 250 microns, and a center-to-center distance of 600 microns.
Results: Microscopic images show that the microneedles are tapered with a relatively sharp tip. Their surface is smooth and without cracks, and they also have an acceptable resemblance to the original design.
Conclusion: The produced microneedle array can be used directly to pierce the skin and increase its permeability by creating micron holes. In addition, this array can be used as a mold for the production of microneedles with malleable materials in the casting method.
Hajar Moghadas,
Volume 14, Issue 2 (8-2023)
Abstract
Microneedles are micron structures that provide the possibility of drug delivery, vaccination and sampling of different organs. The use of microneedles does not require special skills and training, it significantly reduces the dosage and allows the timely release of the drug. The numerous advantages of microneedles compared to other methods of drug delivery have attracted the attention of many researchers. Microneedles are made from the order of microns to millimeters using microfabrication technology using various metals, silicon and polymers. So far, various methods have been proposed for making microneedles. In this article, the conventional and widely used methods of microneedle manufacturing are presented along with their advantages and limitations in terms of the effective parameters in the selection of microneedle. Effective factors such as the type of drug, the desired mechanism for drug delivery, the dimensions and material type lead to the selection of different methods for making microneedles. Among the existing micro fabrication methods, the casting method has the ability to produce different types of microneedles, and thus has been the most popular. The casting method is simple and cheap and can be produced in high volume. Deep reactive ion etching methods make high-precision microneedles, but due to the need for advanced and expensive equipment, a skilled person, and a complex and time-consuming process, they are not capable of mass production. Meanwhile, 3D printing with fully automatic processes is a good option to choose.
Negar Asghari Hosori, Zeinab Bagheri,
Volume 15, Issue 2 (8-2024)
Abstract
The limitations of common needles in drug delivery, such as pain, infection, and side effects, have become a stimulus to search for more efficient alternatives. Meanwhile, microneedles have brought new hope in skin drug delivery. These microstructures are temporarily placed in the upper layers of the skin and provide a painless and non-invasive way for drugs to pass through the skin barrier. Diversity in the design and ingredients of microneedles allows the release of a wide range of drugs with high efficiency and low side effects. On the other hand, nanomedicines are proposed as an ideal alternative due to the limitations of traditional drugs and the need for more targeted and less detrimental options. Nanomedicines are new drug delivery systems that are designed and produced in nanometer dimensions. These small particles can carry and release drugs directly to the target cells with high precision and efficiency. By reducing side effects and increasing the effectiveness of treatment, nanomedicines can play a key role in improving the quality of treatment for various diseases. Considering the unique advantages of the combination of microneedles and nanomedicines, it is an important issue to investigate different strategies for using these new systems in drug release. In this article, this issue has been investigated as well as the applications of nanomedicine transfer by microneedle in the treatment of diseases and the upcoming challenges of this emerging technology.
