Needle geometry measurements. (a) Length of the hair implant needle (A=

Download scientific diagram | Needle geometry measurements. (a) Length of the hair implant needle (A= bevel point length; B 1 = primary bevel length; and C 1 = secondary bevel length). (b-d) Angles of the bevel (α= primary bevel angle; Φ= secondary bevel angle; β= tip angle; λ= acute needle angle). from publication: Effect of Needle Geometry on Insertion Force of Different Hair Implanters | Surgeons insert approximately 3000 hair implants in a single hair restoration surgery, and the needle shape critically affects surgical performance including surgical time, survival rate, and the surgeon's fatigue. There are several experimental studies on the relationship | Needles, Hair Restoration Surgery and Implant | ResearchGate, the professional network for scientists.

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