Formulation delivery device
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United States of America Patent
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Feb 2, 2016
Grant Date -
Apr 15, 2010
app pub date -
Oct 14, 2009
filing date -
Oct 14, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides a device for injection of formulations into a patient. In one embodiment the injection is sub-cutaneous. The device is convenient for injecting viscous formulations that would otherwise clog conventional injection devices, for example formulations containing microspheres, suspensions, and other viscous substances. Generally, the device features a needle for piercing the skin, an internal chamber for holding and transmitting fluid, a plunger for applying pressure to the internal chamber, a switch for triggering withdrawal of the needle, a sheath at least partially encompassing the needle and having a flow path within the sheath, and a spring that expands when the switch is triggered, and which thereby at least partially withdraws the needle from the sheath.
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