Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Ronald W. Marsh0
Edward P. Browka0
Mark Follman0
Date of Patent
January 12, 2010
0Patent Application Number
111028740
Date Filed
April 11, 2005
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A method and apparatus for injecting fluid into areas having high density tissue that creates a high backpressure resistance on the injection device is disclosed. The high backpressure resistance is overcome through a mechanical advantage achieved by using a secondary reservoir having a cross-sectional area smaller than the cross-sectional area of a primary reservoir. Exemplary injection device reservoir housings may comprise a primary reservoir, a secondary reservoir, a check valve, a septum penetrating cannula, travel limits, a pen needle connecting portion, sliding seal guide ribs, a sliding seal, a pen needle assembly, a needle stop, and a patient needle.
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