| 摘要 |
Precision depth guided instruments are provided for use in performing percutaneous implantation of hard tissue implant materials. A depth guided stylet include a point adapted for piercing hard tissue, and preferably, self-tapping threads for self-tapping into hard tissue. The stylet may include an elongated rod having a first section having a first diameter, and a second section having a second diameter larger than the first diameter. A cannula for use with a depth guided stylet includes an elongated tube having first and second open ends adapted for a depth guided stylet to pass therethrough. The cannula may include a pawl passing through the elongated tube for ratcheting against a rack of gear teeth provided on the stylet. Alternatively, a camming mechanism may be pivotal arranged on the stylet. Upon pivoting the camming mechanism, the cam surface provides a driving force against the cannula to drive the cannula along the stylet. A method of using the instruments is also disclosed, as is a kit which includes the instruments and which is used to open a pathway into hard tissue.
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