Granules syringe
AssigneeThera Patent GmbH & Co. KG Gesellschaft Fuer Industrielle Schutzrechte
InventorsGerd Brandhorst, Wolfgang Taeschner
Life of this patent
Estimating the term…
Abstract
A granules syringe, particularly for impregnating granules of a bone cement with blood and for dispensing the impregnated granules, includes a transparent tubular barrel for receiving the granules between a porous front cover and a porous plug. A piston which is separate from the plug and has an integrated seal is disposed behind the plug. When the piston is retracted, the seal is closed so that the vacuum is generated to suck the blood through the porous cover into the granules. When the piston is subsequently advanced, the seal opens so that air has been removed from the granules and passed through the porous plug is permitted to escape rewardly. Upon removal of the cover, the plug is then advanced by the piston to dispense the impregnated granules.
Claims5
A syringe for impregnating granules with a liquid and for dispensing the impregnated granules, comprising
- (a) a generally cylindrical barrel forming a chamber for receiving the granules and having a dispensing front end,
- (b) a removable cover defining a front limitation of said chamber, said cover being permeable to said liquid,
- (c) an air-permeable plug movably disposed within said barrel and defining a rear limitation of said chamber,
- (d) a piston reciprocally disposed within said barrel at the rear side of said plug remote from said chamber, said piston being separate from said plug and retractable away from said plug when said granules are impregnated with the liquid, said piston contacting said plug and moving the same during the dispensing operation, and
- (e) valve means disposed at the rear side of said plug, said valve means being closed when said piston is retracted away from said front end of said barrel, and being open when said piston is advanced toward said front end.
Dependencies are inferred from the claim text.