Plastic & Hair Restoration Surgeon, Aesthetic Plastic Surgery & Hair Transplant Institute, Islamabad, Pakistan.
Department of Mathematics, Govt Postgraduate College, Asghar Mall, Rawalpindi, Pakistan.
J Cosmet Dermatol. 2021 Nov;20(11):3610-3615. doi: 10.1111/jocd.14006. Epub 2021 Mar 8.
Wound injury is a critical issue in hair restoration. The shape and size of blades cause varying degree of tissue trauma.
To check (mathematically) the tissue trauma (injury) caused by different shapes of the blades at varying angles.
PATIENTS/METHODS: The trigonometric theories were applied to each shape and angles to calculate the surface area (correlating with the tissue injury). These shapes included rectangular blade, 30°-angled blades, 60°-angled blade, 30°-sapphire blade, and 60°-sapphire blade. The surface areas were calculated at 90°, 45°, 30°, and 15° insertion angles.
The 30°-sapphire blade caused the least injury followed by 30°-angled blade. The rectangular blade had the largest surface area and hence will produce the maximum amount of tissue injury. The blade at 90° produced maximum injury whereas the blade entering at 15°, produced lowest amount of tissue injury. The blade in sagittal direction caused less injury as compared to the blade in coronal direction.
The 30°-sapphire blade caused the least tissue injury whereas the rectangular blade caused maximum injury. The amount of tissue injury decreases as the angle of insertion decreases and vice versa.
伤口损伤是毛发修复中的一个关键问题。刀头的形状和尺寸会造成不同程度的组织创伤。
检查不同形状的刀头在不同角度下造成的组织创伤（损伤）。
患者/方法：应用三角学理论对每个形状和角度进行计算，以计算出与组织损伤相关的表面积。这些形状包括矩形刀头、30°角刀头、60°角刀头、30°蓝宝石刀头和 60°蓝宝石刀头。在 90°、45°、30°和 15°插入角度下计算表面积。
30°蓝宝石刀头造成的损伤最小，其次是 30°角刀头。矩形刀头的表面积最大，因此会造成最大量的组织损伤。90°的刀头造成的损伤最大，而 15°的刀头造成的损伤最小。矢状方向的刀头造成的损伤小于冠状方向的刀头。
30°蓝宝石刀头造成的组织损伤最小，而矩形刀头造成的损伤最大。插入角度越小，组织损伤的程度越低，反之亦然。
