A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 5/30 (2006.01) A61M 5/20 (2006.01) A61M 5/31 (2006.01) A61M 5/50 (2006.01)
Patent
CA 2108326
An operable single use needless hypodermic injector includes an elongate housing with a proximal end, a distal end, a longitudinal axis and a hollow bore therethrough. The housing has a reservoir at the distal end with a generally cylindrical chamber for containing an injectable liquid. The chamber has a longitudinal axis axially aligned with the housing longitudinal axis. The chamber has a first open end adjacent the housing with a resilient stopper mounted slidably therein. The reservoir has a distal second end with an orifice which is in fluid communication with the chamber. The resilient stopper serves to seal the chamber and to eject the liquid from the chamber, forming a stream at the orifice when the stopper is moved distally in the chamber. The injector has an elongate piston mounted for axial movement within the housing bore and elements to axially bias the piston distally within the bore. The piston has an armed position wherein it is positioned proximally within the bore in opposition to the biasing elements. The injector has elements to retain the piston in the armed position and elements to release the piston from the armed position. When the injector release elements are released, the piston moves distally to engage and move the resilient stopper distally, ejecting the liquid in the chamber through the orifice in a stream which will make a hypodermic penetration when the orifice is placed adjacent dermal tissue. The injector further has elements which substantially prevent the piston from being retained in the armed position once the release elements are released, thereby rendering the injector substantially non-reuseable.
Alchas Paul G.
Prais A. Wes
Becton Dickinson And Company
Gowling Lafleur Henderson Llp
LandOfFree
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