Injector for delivering fluid to internal target tissue
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United States of America Patent
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-
Oct 11, 1994
Grant Date -
N/A
app pub date -
Jan 16, 1991
filing date -
Jan 16, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An injector for delivering fluid to a preselected internal target tissue while avoiding fluid exposure to surface tissue. A needle housing assembly is concealed within a cartridge having a puncturable end cap and an ampule is also disposed within the cartridge separate from the needle housing assembly. The cartridge has a cylindrical bore which widens at one end such that the needle housing assembly which has walls while located within the narrower portion of the cylindrical bore prevents the ampule from being punctured by a hollow injection needle supported by the needle housing assembly. When the ampule is propelled toward the needle housing assembly with a plunger, the needle housing assembly enters the widened portion of the cylindrical bore, allowing its walls to be separated such that the hollow injection needle extends into the ampule allowing the fluid to be delivered from the ampule through the hollow injection needle to the internal target tissue.
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