旋轉切削法為目前組織針頭切片術的主流切削方式，透過加入旋轉可以有效的降低切削力來避免組織過度擠壓藉此取得較好的組織樣本。但過多的旋轉卻會造成組織破壞，這會導致術後併發出血與血腫，有文獻指出讓針頭雙向的旋轉切削時，能有效的降低組織破壞。
過去的研究皆著重在單方向的旋轉，尚未有人研究過雙向旋轉時的力學表現，本研究使用膠合性介面技術來建立一針頭旋轉切削軟組織之有限元素模型，來找出單向切削時最好的切削參數，並藉由實驗來確認雙向切削與單向切削之間的關係，而在組織破壞方面，我們分成針頭軸向截面與徑向截面，利用數位影像相關法來觀察組織內的破壞情況。
本研究主要發現為:
1.當前進速度越快，切削力與軸向截面應變越大。
2.轉速比越高，切削力越小，軸向截面應變越小，徑向截面應變越大。
3.雙向切削能降低徑向截面應變10%~20%。
本研究最後歸納出最好的切削參數為前進速度1(mm/s)、轉速比1.9之雙向切削針頭，此參數能有最小的切削力與較低的軸向與徑向破壞。

Rotational cutting is commonly used in needle biopsy and has been shown to efficiently reduce the cutting force. However, studies have found that a high rotational velocity would increase tissue damage.
This study established a cohesive surface based finite element model for soft tissue cutting to obtain the optimal cutting parameters for rotational cutting. Damage in tissue was observed by using DIC at the axial and radial section of the needle.
The main findings of this research are (1) The faster the needle insertion velocity, the greater effective strain and cutting force occurred on the axial section of the needle;(2) The increasing of SPR (slice-push ratio) would reduce the cutting force and effective strain on the axial section of the needle, but increase that on the radial section of the needle;(3) Applying bi-directional rotation could decrease 10%~20% of mean effective strain on the radial direction of the needle.
According to the results, we suggested that the best cutting parameters were the bi-directional cutting with an insertion velocity of 1 (mm/s) and SPR of 1.9. These parameters could result in the minimum cutting force, lower axial and radial damage.

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