Anna G. U. Sawa,Seungwon Baek,Neil R. Crawford,Phillip M. Reyes,Sam Safavi-Abbasi,Nicholas Theodore
申请号：
US12485183
公开号：
US08974505B2
申请日:
2009.06.16
申请国别(地区):
US
年份:
2015
代理人:
摘要：
A cannulated and possibly fenestrated device for injection of material into bone can be dangerous because large, uncontrolled pressures are introduced during injection into a somewhat closed system, and material may extrude undesirably or emboli may be introduced. Methods and devices are described for providing venting of pressure upon injection of material through cannulated and possibly fenestrated screws. The first method involves a bone screw and/or anchor device that includes multiple channels to allow material to flow in through one channel and out through another channel. The second method involves a plunger that can force material into bone if advanced or lessen pressure if withdrawn. The third method involves usage of two separate screws. Material is alternately injected or withdrawn from each screw to cause material to flow from one screw to the other in a controlled way that creates a uniform or asymmetrical distribution of material as desired.
