Inflation deflation syringe assembly for use in angioplasty procedures

A syringe assembly, comprising:

• a housing having a barrel having a forward fluid discharge end;
• a plunger disposed within said barrel;
• means for advancing said plunger forward relative to said barrel;
• and
• pulsing means for pulsing said plunger in said barrel from a starting position to a forward pulsed position wherein said plunger is displaced forwardly from said starting position and from said forward pulsed position to said starting position whereby fluid is pulsed out of and into said barrel through said forward fluid discharge end, wherein said plunger further includes a threaded rod attached to said plunger and said means for advancing includes threaded means for engaging said threaded rod for threaded advancement, wherein said pulsing means pulses said threaded means and wherein said threaded means is directly engaged with said threaded rod during pulsing from said starting position to said forward pulsed position and from said forward pulsed position to said starting position.

A syringe assembly, comprising:

• a housing having a barrel having a forward fluid discharge end;
• a plunger disposed within said barrel and having a threaded rod extending therefrom;
• threaded means for engaging said threaded rod for threaded advancement of said plunger relative to said barrel;
• control means for positively engaging and positively disengaging said threaded means with said threaded rod;
• and
• means for pulsing said threaded means from a starting position to a pulsed position forward of said starting position, and from said pulsed position to said starting position while said threaded means is positively engaged with said threaded rod whereby said plunger is pulsed forward and rearward in said barrel.

A syringe assembly, comprising:

• a housing having a barrel having a forward fluid discharge end;
• a plunger disposed within said barrel and having a threaded rod extending therefrom;
• threaded means for engaging said threaded rod for threaded advancement of said plunger relative to said barrel;
• control means for positively engaging and positively disengaging said threaded means with said threaded rod, said control means having a first arm member and a second arm member, said first arm member being connected to said threaded means, said control means being pivotably mounted for pivot between an engaged position wherein said first arm member positively engages said threaded means with said threaded rod, and a disengaged position wherein said first arm member positively disengages said threaded means from said threaded rod;
• and
• trigger means mounted relative to said housing for pivoting said control means toward said disengaged position, said second arm member being connected to said trigger means, said first arm and said second arm of said control means being joined at a pivot point so as to define a substantially L-shaped lever, and wherein said lever is pivotably mounted within said housing at said pivot point.