旋轉切削法 常被應用於醫療領域中，如真空輔助切片取樣檢查等微創手術。過去文獻表示，凸曲面針適合旋轉穿刺。然而，有研究指出，雖然旋轉穿刺能降低切削力，但也可能造成組織破壞，導致併發症如出血、血腫等的發生。雙向旋轉的運動行為可能可以減少針尖處軟組織纏繞所造成的破壞，但過去研究中尚未深入探討。因此，本研究針對凸雙曲面針的新式設計，提出此支針頭的製程，應用於設計評估，藉此評估此支針頭 在單雙向旋轉穿刺時的力學性能，並探討針尖幾何和運動參數對於軟組織破壞的影響。希冀能改善臨床上的併發症問題，降低旋轉穿刺時造成的損傷。
本研究首先提出一套以研磨和放電加工方式的曲面針製造方法，目的在於研發能夠在一般實驗室環境中進行製造的方法，確保針頭品質的一致性及實驗的穩定性。針對自製針頭，以田口方法評估不同參數對於徑向截面上的組織損傷的影響，並且與雙向旋轉的穿刺運動模式進行比較和評估。研究中也比較了不同針頭類型，包括凸雙曲面針、凸單曲面針和平頭針的性能，評估各針頭進行單向及雙向旋轉時，對徑向截面造成的組織損傷及軸向穿刺力的表現，提供臨床上穿刺取樣的參數參考。
本研究所提出的曲面針製造流程，其導角角度與理論值的誤差小於14.39%，且針尖的不同幾何特徵和斜邊長度與理論值之間誤差皆小於1%，拍攝的針尖幾何輪廓比對理論曲線高度吻合，顯示此套方法能製作出所需的針尖幾何，並具有卓越的加工精度。 另外，本研究發現凸雙曲面針適合單向旋轉穿刺，與其他針頭相比具有最優異的性能，能造成最小的穿刺力與組織損傷。對於徑向截面的組織損傷，本研究建議的最佳參數組合為無導角、K=0.4、軸向速度1 mm/s、轉速比5。

Rotational insertion are commonly used in the medical field. Previous study has shown that concave-curved needles are suitable for rotational cutting. However, rotational insertion may result in tissue damage, leading to complications such as bleeding and hematoma. The purpose of this study is to develop a manufacturing process for curved needles in a laboratory setting for design evaluation. It evaluates the unexplored performance aspects of double concave-curved needles during unidirectional and bidirectional rotation during needle insertion. The study examines how needle tip geometry and motion parameters affect tissue damage in radial cross-section and axial cutting forces. In this research, a process for manufacturing concave-curved needles using grinding and electrical discharge machining is proposed. The Taguchi method is used to evaluate the effect of various parameters on cutting force and tissue damage. Performance comparisons are made among different needle types, including double concave-curved needles, single concave-curved needles, and blunt needles. The results indicate that the manufacturing process can successfully produce double concave-curved needles and previously unproduced single concave-curved needles with high precision machining capabilities, with theoretical errors as low as 1%. In terms of performance comparison, double concave-curved needles excel in unidirectional rotational insertion, generating minimal cutting force and tissue damage. For radial tissue damage, the recommended optimal parameter combination is unsharpened, K=0.4, v_a=1 mm/s, and S=5. The findings of this study will contribute to needle manufacturing, needle design and parameter selection for design evaluation and improved sampling quality with minimal tissue damage.

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