Researchers invent novel microneedle patch for faster and effective delivery of painkiller and collagen
Individuals who are squeamish about injections or are looking for a way to let collagen penetrate deeper into the skin may soon have a solution that is faster, more effective and painless. The key lies in a small adhesive patch topped with minuscule needles that is pioneered by researchers from the National University of Singapore (NUS).
The research team, led by Dr Kang Lifeng of the Department of Pharmacy at the NUS Faculty of Science, has successfully developed a simple technique to encapsulate lidocaine, a common painkiller, or collagen in the tiny needles attached to an adhesive patch. When applied to the skin, the microneedles deliver the drug or collagen rapidly into the skin without any discomfort to the user.
This innovation could be used clinically to administer painkiller non-invasively to patients, or in home care settings for patients suffering from conditions such as diabetes and cancer. In addition, the novel transdermal delivery system could also be used for cosmetic and skincare purposes to deliver collagen to inner skin layers.
Faster delivery of painkillers is key to effective management of acute and chronic pain conditions. Currently, such drugs are mainly administered through invasive injections, or through the use of conventional transdermal patches, which may have limited efficiency due to variability of drug absorption among individuals.
To address the clinical gap, Dr Kang, together with Dr Jaspreet Singh Kochhar, who had recently graduated from NUS with a doctorate degree in Pharmacy, and their team members, used a photolithography based process to fabricate a novel transdermal patch with polymeric microneedles. The tiny needles are encapsulated with lidocaine, a common painkiller known for its pain-relief property.
Laboratory experiments showed that the novel microneedles patch can deliver lidocaine within five minutes of application while a commercial lidocaine patch takes 45 minutes for the drug to penetrate into the skin. The shorter time for drug delivery is made possible as the miniature needles on the patch create micrometre-sized porous channels in the skin to deliver the drug rapidly. As the needle shafts are about 600 micro-meters in length, they do not cause any perceivable pain on the skin.
The patch also comprises a reservoir system to act as channels for drugs to be encapsulated in backing layers, circumventing the premature closure of miniaturised pores created by the microneedles. This facilitates continued drug permeation. In addition, the size of patch could be easily adjusted to encapsulate different drug dosages.
By delivering painkillers faster into the body through the skin, patients could potentially experience faster pain relief. In addition, enabling a larger amount of lidocaine to permeate through the skin could potentially reduce the time needed to apply the patch and this reduces the likelihood of patients developing skin irritation. National University of Singapore