June 2026 in “Frontiers in Cell and Developmental Biology” In this review, researchers examined how needle gauge and length impact the viability of human stem cells during injections, emphasizing the balance between minimizing tissue trauma and preserving cell viability to optimize clinical protocols.
January 2021 in “Advanced Biomedical Engineering” This study found that hair implant needles with longer point lengths and smaller bevel angles required less total work for insertion, which corresponded with surgeons' perceptions of insertion force differences.
June 2020 in “Applied sciences” This study introduced a semi-automatic hair follicle implanter that can reduce surgery time and fatigue for both patients and surgeons, with effectiveness demonstrated in animal and clinical trials.
August 2019 in “Journal of The American Academy of Dermatology” This article discusses the premade slit method in hair restoration surgery, emphasizing the importance of a tailored depth control instrument for optimal follicle implantation, but provides no new clinical results.
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August 2014 in “The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology” This case study found that pharmacopuncture and needle-embedding therapy improved hair loss and physical condition in a woman with androgenetic alopecia, but further clinical studies are needed.