Pneumatically-Powered Ophthalmic Injector
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United States of America Patent
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-
N/A
Issued Date -
Jan 15, 2009
app pub date -
Jul 13, 2007
filing date -
Jul 13, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An ophthalmic injection device has a dispensing chamber housing, a plunger, a shaft connected to the plunger, and a pneumatic cylinder. The dispensing chamber housing has an inner surface partially defining a dispensing chamber for holding a quantity of a substance. The plunger is engaged with the inner surface of the dispensing chamber housing, is capable of sliding in the dispensing chamber housing, and is fluidly sealed to the inner surface of the dispensing chamber housing. The pneumatic cylinder has a piston movable in a chamber. The piston is connected to a shaft. The shaft is connected to the plunger. The shaft has teeth located on its surface. A pawl is engageable with the teeth and limits movement of the shaft to a dispensing direction. Pneumatic pressure introduced into the chamber moves the piston, shaft, and plunger in a dispensing direction.
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