Venting/pressure adjustment to aid in delivery of material into an anatomic region via a cannula
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United States of America Patent
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Mar 10, 2015
Grant Date -
Apr 29, 2010
app pub date -
Jun 16, 2009
filing date -
Jun 16, 2008
priority date (Note) -
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Abstract
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 The second method involves a plunger that can force material into bone if advanced or lessen pressure if withdrawn.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 Material is alternately injected or withdrawn from each screw to cause material to flow from one screw to the other in a controlled way that creates a uniform or asymmetrical distribution of material as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.
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