Explore the vast range of titles available.

Background Skin biorevitalization involves multiple intradermal injections to enhance skin quality, but precise dermal targeting can be challenging due to variations in skin thickness smaller, less painful needles with fewer skin reactions are attractive options. Aims This study evaluates a new Micro‐Needle device's performance and safety in comparison with the classic needle used in skin biorevitalization. Patients/Methods Subjects with facial and neck skin aging were enrolled. Safety outcomes, including immediate and local tolerability, were assessed. Performance outcomes measured skin radiance, wrinkles and photoaging grade, hydration, subepidermal low echogenic band, dermis thickness, and skin elasticity. Both subjects and investigators recorded Global Aesthetic Improvement Scale scores. Results Micro‐Needle injections demonstrated superior performance compared to the classic needle, influenced by the specific skin zones and thickness. Micro‐Needle was superior for skin wrinkles at D49 for periorbital zone and nasolabial folds by −14.5% (p = 0.01) and −15% (p = 0.004), respectively, and for neck by 9.6% (p = 0.0008). The Nanosoft device showed a faster improvement for skin hydration at D42 for the cheek zone (p = 0.04) and at D75 for the neck area (p = 0.01); and for skin radiance at D75 (p = 0.03) and at D120 (p = 0.0098). Ex vivo studies confirmed the Micro‐Needle's accuracy in product placement in the dermis. Adverse events were milder with Micro‐Needle and no serious adverse events occurred. Conclusions Both needles significantly improved skin quality, but Micro‐Needle enhanced the outcomes of skin biorevitalization procedures, particularly in terms of skin wrinkle reduction, elasticity, and overall skin hydration.

Micro-needle electrodes (MEs) have attracted more and more attention for monitoring physiological electrical signals, including electrode-skin interface impedance (EII), electromyography (EMG) and electrocardiography (ECG) recording. A magnetization-induced self-assembling method (MSM) was developed to fabricate a microneedle array (MA). A MA coated with Ti/Au film was assembled as a ME. The fracture and insertion properties of ME were tested by experiments. The bio-signal recording performance of the ME was measured and compared with a typical commercial wet electrode (Ag/AgCl electrode). The results show that the MA self-assembled from the magnetic droplet array under the sum of gravitational surface tension and magnetic potential energies. The ME had good toughness and could easily pierce rabbit skin without being broken or buckling. When the compression force applied on the ME was larger than 2 N, ME could stably record EII, which was a lower value than that measured by Ag/AgCl electrodes. EMG signals collected by ME varied along with the contraction of biceps brachii muscle. ME could record static ECG signals with a larger amplitude and dynamic ECG signals with more distinguishable features in comparison with a Ag/AgCl electrode, therefore, ME is an alternative electrode for bio-signal monitoring in some specific situations.

Introduction Dry Eye Disease (DED) is a prevalent and significant condition that affects a large number of people. Artificial tears can alleviate the symptoms in patients with mild to moderate dry eyes, but they do not have a long-term effect. Micro-needle is a novel type of acupuncture, with needle tips arrayed on a silicon chip attached to medical plaster, without penetrating the skin. Its effectiveness and efficacy need to be proven clinically. Methods and analysis This is a single-center, randomized, sham-controlled trial. In total, 129 DED patients will be recruited and randomized into three groups: micro-needle, sham, and artificial tears. They will receive four weeks of treatment and undergo follow-up at six and ten weeks. The primary outcome is measured by the Objective Symptoms Scoring Sheet (OSSS). Secondary outcomes include the China Dry Eye Questionnaire (CDEQ), Ocular Surface Disease Index (OSDI), non-invasive tear film break-up time (NIBUT), Schirmer Test I (SIT), Tear Meniscus Height (TMH), and Corneal Fluorescein Staining (CFS). Questionnaires, including OSSS, CDEQ, and OSDI, will be administered at screening, at the end of week two, and at the conclusion of week four, when treatment is completed. They will also be conducted at follow-up in week six and week ten; OSSS will be taken additionally on day two of the treatment. Tests of Intraocular Pressure (IOP), Best Corrected Visual Acuity (BCVA), NIBUT, SIT 1, TMH, and CFS are conducted at screening and upon completion of treatment. At week two, NIBUT, SIT 1, TMH, and CFS tests are taken as intermittent measurements. Ethics and dissemination The trial protocol and informed consent document were reviewed and approved by the Ethics Committee of the Shanghai Municipal Hospital of Traditional Chinese Medicine (Approval Number: 2023SHL-KY-101–01). Prior to enrollment, each potential participant undergoes a structured informed consent process conducted by a trained research coordinator, which includes explaining the trial purpose, design, interventions, benefits, risks, and time commitments; providing sufficient time for participants to review the plain-language written informed consent document; addressing all questions to ensure comprehension; and obtaining signed written consent, with a copy provided to the participant and the original stored in the trial file. To safeguard participant confidentiality, all data are labeled with a unique study ID instead of personal identifiers; paper records are stored in locked cabinets in a restricted-access office, and electronic data are stored on password-protected, encrypted servers accessible only to authorized team members via unique logins; de-identified data are used solely for analysis and reporting, with personal identifiers accessible only to the trial coordinator for enrollment and follow-up and never shared with other parties; and study findings in publications and presentations will be aggregated to prevent individual identification. The findings of this investigation will be disseminated through peer-reviewed publications, and any protocol amendments will be submitted to the ethics committee for re-approval and updated in the trial registry. Trial Registration Number ChiCTR2300078187 Trial Registration Date 2023.11.30 Trial Registry China Clinical Trial Registration Center https://www.chictr.org.cn

Cell therapy is used to treat various diseases and to repair injuries. Cell delivery is a crucial process that delivers cells to target sites. Cells must be precisely delivered to a target site and the cells that are delivered must be localized to the target site to repair damaged tissue. For stem cell therapy, the most convenient method of cell delivery involves directly injecting cells into damaged tissue. Other strategies use carriers to transplant stem cells into damaged tissue. These are termed, stem cell delivery systems (SCDSs). Micro-needle arrays are minimally invasive transdermal delivery systems. The devices can pass through the stratum corneum barrier and deliver macromolecules into the skin. They can also access the microcirculation system in the skin. This study fabricates PMMA micro-needle using a two-stage micro-molding method. Cells are seeded on the micro-needle arrays and then transferred into the target tissue. Collagen hydrogel is used as a model biomimetic tissue. Cells are efficiently delivered to regions of interest, collagen hydrogel, by using this system. The delivery rate is about 83.2%. This demonstrates that micro-needle arrays allow very efficient delivery of cells.

A novel micro-needle array electrode (MAE) fabricated by thermal drawing and coated with Ti/Au film was proposed for bio-signals monitoring. A simple and effective setup was employed to form glassy-state poly (lactic-co-glycolic acid) (PLGA) into a micro-needle array (MA) by the thermal drawing method. The MA was composed of 6 × 6 micro-needles with an average height of about 500 μm. Electrode-skin interface impedance (EII) was recorded as the insertion force was applied on the MAE. The insertion process of the MAE was also simulated by the finite element method. Results showed that MAE could insert into skin with a relatively low compression force and maintain stable contact impedance between the MAE and skin. Bio-signals, including electromyography (EMG), electrocardiography (ECG), and electroencephalograph (EEG) were also collected. Test results showed that the MAE could record EMG, ECG, and EEG signals with good fidelity in shape and amplitude in comparison with the commercial Ag/AgCl electrodes, which proves that MAE is an alternative electrode for bio-signals monitoring.

Obesity is a global health crisis strongly linked to increased risk of type 2 diabetes, cardiovascular diseases, and other metabolic disorders. Glucagon-like peptide-1 (GLP-1) has emerged as an effective macromolecular therapeutic agent for weight management. This study addressed obesity management from three distinct perspectives: enhancing drug dispersion and bioavailability through a novel drug delivery device, extending drug half-life by developing sustained-release formulations, and sustaining the weight loss through implementation of structured dietary protocols. A new technology, micro-needle jet injection (MNJI) was developed to deliver both standard semaglutide formulations and highly viscous sustained-release formulations, achieving 100% subcutaneous delivery with predictable results. Modulation of MNJI parameters enabled the generation of various dispersion profiles, resulting in higher bioavailability compared to both needle injection (NI) and needle-free jet injection (NFJI). Sustained-release formulations, effectively administered via MNJI, exhibited higher bioavailability than the non-sustained release formulation, and positively impacted weight management efficacy in two distinct ways. First, a single injection achieved the same weight loss as five daily administrations of non-sustained release formulation. Second, a subsequent injection of the sustained-release formulations resulted in a further body weight reduction to 18%, contrasting sharply with the plateau at 13% observed in the standard formulation administered daily (  < 0.05). Finally, dietary management, particularly time-restricted feeding, successfully maintained weight loss at ∼18% below baseline levels. Collectively, the combination of MNJI delivered sustained-release formulations and structured dietary protocols offers a promising and patient-friendly strategy for long-term obesity management, improving both adherence and therapeutic outcomes.

Striae distensae (SD) cause a cosmetic problem to many patients. Recently, fractional micro-needle radiofrequency (FMR) device has been introduced in treatment of SD. Also, fractional CO2 laser has been used as a resurfacing laser technique in the treatment of SD. The aim of our study was to assess and compare between the efficacy of FMR and fractional CO2 laser in treatment of SD. Seventeen female patients with SD were enrolled in this study. Detailed history was taken and dermatological examination was done to determine the type of striae, the location, and measurement of the width of the largest striae on each side. In each patient, one side was randomly assigned to treatment by FMR (area A), and the other side to treatment by fractional CO2 laser (area B). Our results showed that both techniques were effective. A slight better efficacy was encountered with FMR, but the difference was not statistically significant (p = 0.716). The current study concluded that FMR and fractional CO2 laser are almost equally effective in the treatment of SD (rubra and alba). Development of post inflammatory hyper-pigmentation (PIH) was evident with fractional CO2 in contrast with FMR, and the difference was statistically significant (p = 0.001).

In plant research, measuring the physiological parameters of plants is vital for understanding the behavior and response of plants to changes in the external environment. Plant sap analysis provides an approach for elucidating the physiological condition of plants. However, to facilitate accurate sap analysis, a sampling device capable of collecting sap samples from plants is required. In this paper, a minimally invasive, needle-type micro-sampling device capable of collecting nanoliter (~ 91 nL) quantities of sap from plants is described. The developed micro-sampling system showed great reproducibility (3%) in experiments designed to assess sampling performance. As a proof of concept, sap samples were collected continuously from target plants with the micro-sampling system, and the dynamic changes in potassium ions, plant hormones and sugar levels inside plants were analyzed. The results demonstrated the feasibility of the micro-sampling device and its potential for developing a measurement system for plant research in the future.

A polymeric micro-needle array with high quality has been fabricated using a longitudinal ultrasonic-assisted micro-injection molding (LUμIM) method. To realize the practicability and stability in actual industrial processing, this paper is aimed at studying the improvement mechanism of ultrasonic vibration on the molding quality. The melt-filling process in the micro-needle array cavity is simulated, and the improvement effect of ultrasonic vibration is discussed. The enhancement effect of ultrasonic vibration on material properties of polypropylene and polymethylmethacrylate parts are experimentally investigated. The results show that in the manufacturing of the micro-needle array part using LUμIM, the mold-filling quality is improved by the enhanced melt filling capability and pressure compensation effect, which are caused by the increased corner viscosity gradient, reduced the filling time and melt viscosity under ultrasonic vibration. Material properties of both the semi-crystalline polymer and amorphous polymer could be enhanced by the transformation of micromorphology. It is proved that for a semi-crystalline polymer, this novel method could be employed as a material properties enhancement method, and an optimal excitation voltage of ultrasonic vibration is obtained to achieve the best material properties.

Micro-injection molding (μIM) is considered to be an important method for fabricating micro-needle array which is widely researched in recent years, and mold temperature is one of the important factors that affect the mold filling quality of the polymer melt during the micro-injection molding. In this paper, an infrared heating method is adopted to raise the mold temperature rapidly for improving molding quality of micro-needle array. According to the simulation of the reflector type, which has an important effect on the efficiency of infrared heating system, an infrared heating system with high efficiency is developed and used in the developed infrared-heating-assisted μIM system. A series of verification experiments are carried out to verify the feasibility and the heating effect of the developed system. The experimental results show that the developed infrared heating system can achieve high efficiency and uniform heating of mold surface and the infrared-heating-assisted μIM process for fabricating micro-needle array can improve mold filling capability of the polymer melt and optimize the replication quality (filling height, uniformity, and shrinkage) of parts.