Plunger rod and assembly having modified thread geometry

A fluid-dispensing syringe includes a barrel and a plunger assembly disposed within the barrel. The assembly includes a piston with an outer piston surface, an inner piston cavity with an inner piston surface and at least one female thread, and proximal and distal piston ends. The plunger rod includ...

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Bibliographische Detailangaben
Hauptverfasser:	Thompson, James, Sweeney, Matthew Dylan, Shafer Greenberg, Lauren
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY DISINFECTION, STERILISATION, OR DEODORISATION OF AIR HUMAN NECESSITIES HYGIENE MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES MEDICAL OR VETERINARY SCIENCE METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL
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Beschreibung
Zusammenfassung:	A fluid-dispensing syringe includes a barrel and a plunger assembly disposed within the barrel. The assembly includes a piston with an outer piston surface, an inner piston cavity with an inner piston surface and at least one female thread, and proximal and distal piston ends. The plunger rod includes a rod body having proximal and distal rod ends, with a threaded extension extending distally from the distal rod end. The threaded extension extends distally along a distal length and threadedly engages the at least one female thread along a portion of the distal length. The threaded extension has a ventilation feature configured to create a ventilation space between the threaded extension and the inner piston surface. The proximal piston end and the distal rod end are in spaced relation to form a primary fluid passageway portion from outside of the plunger assembly into the piston cavity.