使用球形鑽頭進行鑽孔，從大切割/槽形工具開始，並逐漸地向下工作到較小的工具（通常以2mm增量）。
切割通常在均勻的圓周運動中進行，在手術結束時經常使用鑽面球型鑽頭來進行精細解剖結構。

刀頭側面的槽（最具腐蝕性）應用於更快的解剖，減少“顫動”並減少熱量。 這可通過使鑽頭稍微傾斜來實現。

建議可使用軸承:AA07,AS07
7公分球型切割鑽頭 & 7公分球型鑽面鑽頭

從用於皮質骨切割的大型球面鑽頭到用於Cochleostomies所需的精細小直徑工具的侵蝕性切割。 
增加的MN系列的鑽頭的淺槽，用於其平滑的切割感覺使它們成為顳骨手術的優選選擇。

-Dissect bone immediately posterior to the external auditory canal wall and anterior to the facial nerve (open the facial recess)
-The purpose is to remove the bone lateral to facial nerve to access the round window to insert an electrode into the cochlea. The electronic receiver which sends signals to the electrode is implanted subcutaneously in the drilled out mastoid bone cavity.
-Drilling is done with small and very small diameter diamond ball tools
-Drill-tool system stability and visualization are at a premium here since the drill is dissecting directly adjacent to two branches of CN Ⅶ, the labyrinth and cochlea

建議可使用軸承:AT10,AS09
專利尼龍彎曲鑽頭 & 9公分圓柱型鑽頭

在用於乙狀竇開顱術的鑽孔之後，進行鑽孔與開顱手術附件然後中型球刀和中/小直徑
鑽面球型鑽頭。

鑽具系統的穩定性和可視化是非常重要的，這裡由於鑽頭直接在兩側上/鄰近兩側進行解剖
CNVⅡ的分支，半規管，鼓膜和鐙骨。

Approach Disadvantages:
▸ Cerebellar retraction.
▸ Increased rate of CSF leak.
▸ Greater chance of headache.
▸ The highest incidence of tumor recurrence.
▸ A retrosigmoid craniotomy is completed (immediately adjacent to the sigmoid and transverse sinuses). Any mastoid air cells are carefully waxed off to prevent
postoperative CSF leaks. The dura is opened and the arachnoid incised.
▸ Once the tumor has been debulked, the posterior wall of the internal auditory canal is drilled away. Great care must be taken to avoid injuring the labyrinth while removing the posterior wall of the internal auditory canal.
Portions of the labyrinth are often immediately adjacent to the internal auditory canal. No sigle anatomic landmark is completely relibale for prevention of injury to the labyrinth.

建議可使用軸承:AA10,AS10,AF02
10公分球型鑽頭 & 8公分開顱鋸

A number of approaches can be used for vestibular neurectomy
depending on specific advantages and disadvantages.
The different approaches are as follows:

Middle cranial fossa
Retrolabyrinthine
Retrosigmoid (suboccipital)
Combined retrolabyrinthine and retrosigmoid
Translabyrinthine

建議可使用軸承:AA10,AS10,
10公分球型鑽頭 

The width of the facial recess is only 2mm ate its narrowest point. Theis narrow space immediately adjacent to the facial nerve and chorda tympani (branch of CNⅦ) often requires extended length diamond tools to provide good visualization.

Lots of irrigation is necessary to keep tool head cool and avoid frictional heating of VⅡCranial Nerve (CN VⅡ-Facial Nerve).

 建議可使用軸承:AA10,AS10,

10公分球型鑽頭

The Legend System offers a great variety of tools and attachments for cranial surgery from footed attachments for burr holes, twist drills for suture holes, and long elongated telescoping tools for use in transfacial and transoral approaches.
The large diameter acorn tools are preferred by neurosurgeons for burr holes for the less agressive tip which makes it less likely to cut on soft tissue.

The 9 cm tool and attachment line are preferred for cranial procedures dute to its large bore that allow it to carry load better than smaller bore ones.

建議可使用軸承:AS08,AS09
8公分開顱鋸, 9公分橡頭型鑽頭 

TAPERED
Slender design for precise dissection with minimal bone loss. For transection, osteotomy, graft harvesting, bone shaping, entry hole, suture hole, midface advancement, etc

Tapered tools are preferred for a zygomatic approach or when dissecting around the orbital rim.

TWIST DRILL
Helical design with stop produces a hole with a precise length. Ideal for plating.

建議可使用軸承:AS08
8公分開顱鋸, 8公分麻花型鑽頭

The footed attachment accomodates bone from 10 mm to 25 mm thick. The AF01R and AF02R are rotating footed attachments that allow more maneuberability.

The skin and muscles are lifted off the bone and folded back. Next, one or more small burr holes are made in the skull with a drill. Inserting a special saw through the burr holes, the surgeon uses this craniotome to cut the outline of a bone flap (Fig. 3). The cut bone flap is lifted and removed to expose the protective covering of the brain called the dura. The bone flap is safely stored until it is replaced at the end of the procedure.

建議可使用軸承:AF01,AF02,AF03
8公分開顱鋸, 9公分開顱鋸

ACORN
The curved design varies dissection efficiency with varied approach angles. Used for entry hole, laminotomy, bone shaping, debridement, corpectomy, decortication,
fusion takedown, etc.

建議可使用軸承:AS09
9公分球型鑽頭, 9公分橡頭型鑽頭

Standard soft tissue and maxillofacial surgery instruments trays are usually adequate to complete a partial or total maxillectomy. A standard endoscopic sinus surgery set-up is used for an endoscopic medial maxillectomy. Reciprocating, sagittal, and oscillating saw blades facilitate the osteotomies, but those over the anterior and lateral walls of the maxilla are best performed with Kerrison rongeurs. This latter technique creates a wide osteotomy that serves as a window to monitor the margins of the resection while avoiding injury of the soft tissues deep to the osteotomy. Similarly, small bone chisels and osteotomes may be used as needed.

MATCH HEAD
Elongated spherical design allows controlled, delicate dissection. For entry hole, nerve decompression, electrophyte removal, sinus dissection.

建議可使用軸承:TT12A,TT12C,TT15,AA10,AA14
12公分-15公分內視鏡火柴型鑽頭, 10-14公分火柴型鑽頭

椎板切除（Lamina Discectomy)

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