The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 1999
Filed:
Jul. 01, 1997
Gary E Alexander, Baton Rouge, LA (US);
Medisys Technologies, Inc., Baton Rouge, LA (US);
Abstract
The invention comprises a needle aspiration safety syringe having a barrel, a plunger, a retractable needle, and a delayed engagement mechanism. The needle is functionally connected to the plunger by the delayed engagement mechanism such that when the plunger is retracted from an initial extended position, the needle does not retract immediately. The needle provides passage into the fluid receiving cavity, such that retraction of the plunger causes tissue fluid to flow from a target tissue through the needle and into the fluid receiving cavity. Further retraction of the plunger causes the delayed engagement mechanism to engage, whereupon the needle can be withdrawn completely into the fluid receiving cavity, such that the sharp end of the needle is no longer exposed. After the needle withdraws completely into the fluid receiving cavity, the needle cannot exit the fluid receiving cavity, such that the sharp end of the needle poses no danger of sticking a user or patient. Fluids can be stored in the fluid receiving cavity, and can be discharged through a port by depressing the plunger. When the plunger is depressed to discharge collected tissue fluid, the needle deforms inside the barrel.