Syringe for injections, especially intravenous made to be used only once, without any possibilityof re-aspiration

• US 4,863,427 A
• Filed: 03/18/1988
• Issued: 09/05/1989
• Est. Priority Date: 03/19/1987
• Status: Expired due to Fees

• Current Assignee: Pietro Cocchi
• Original Assignee: Pietro Cocchi
• Inventors: Cocchi, Pietro
• Primary Examiner(s): Yasko, John D.
• Application Number:
  US07/175,870
• Time in Patent Office: 536 Days
• Field of Search: 604/110, 604/111, 604/218, 604/187, 604/228
• US Class Current: 604/110
• CPC Class Codes: A61M 2005/5073 by breaking or rupturing the connection parts
• CPC Class Codes: A61M 5/5066 Means for preventing re-use by disconnection of piston and piston-rod
• CPC Class Codes: A61M 5/508 Means for preventing re-use by disrupting the piston seal, e.g. by puncturing

Abstract

In a syringe for injections, especially intravenous --being realized so as to be used only once and comprising a body making up the cylinder to which the needle is fitted, a piston sliding in said cylinder and a piston handling member (stem) for recalling the piston during the liquid aspiration phase and for pushing the piston during the injection phase--said piston and said handling member (stem) are engaged with one another in a non-rigid way, in order to neutralize a further aspiration operation after a first phase of piston push has been carried out.

Claims

1. A syringe for injections, especially intravenous injections, to be used only once, comprising a cylinder, a needle inserted into said cylinder, a piston slidable in said cylinder and a piston handle member for recalling said piston during a liquid aspiration phase and for pushing the piston during an injection phase, joint means for providing a connection between said piston and said handle member, said joint means connection between said piston and said handle member being neutralized upon commencement of said injection phase before a second aspiration operation, in order to prevent a further aspiration operation, said handle member being joined to said piston with some limited axial clearance, and wherein one of said handle member and said piston has a perforating tip and the other of said handle members and said piston has a lacerable wall;

the aspiration is carried out with said wall being integral, the thrust exerted for the injection causing the laceration of said lacerable wall preventing a further aspiration operation.

2. A syringe according to claim 1, wherein said perforating tip is carried by said handle member and said lacerable wall is formed by said piston.

3. A syringe comprising:

a cylinder with a first end and a second end;

a needle closing and extending out of said first end;

a piston in said cylinder and in sliding engagement with said cylinder, said piston having a recess extending axially through said piston with a first end arranged toward said needle and an opposite orifice end, a membrane covering said piston first end, said piston orifice end having an annular seat, a recess length defined by the distance between said membrane and said annular seat;

a stem having a handle portion extending out of said cylinder second end and arranged to fit slidably in said cylinder, said stem having a pointed arranged to fit in said recess, a shoulder on said stem between said handle portion and said pointed end and arranged to fit sealingly over said annular seal, a stem working distance defined by the distance between said shoulder and said pointed end, said working distance being substantially longer than said recess distance;

a detent means connected to said piston, said stem being fitted through said detent means, said shoulder being movable between said piston annular seat and said detent means;

said piston being pullable away from said needle by pulling said stem away from said needle effecting said shoulder to pull said detent means and said piston;

said piston being pushable toward said needle by pushing said stem toward said needle effecting said shoulder to push said piston toward said needle and causing said pointed end to puncture said membrane.

4. A syringe, comprising a cylinder having a discharge end, and a discharge needle closing and extending out of said cylinder, a stem member having a handle portion extending outside of said cylinder on the end thereof opposite to said needle and having an inner portion with an expansion in slidable engagement with said cylinder, a floating piston in slidable engagement with said cylinder between said expansion and said needle, and discontinuing means defined between said expansion and said discontinuing means for allowing a first movement of said piston in a direction away from said needle to draw a liquid through said needle into said cylinder, and said discontinuing means for destroying the structural integrity of said syringe upon movement of said piston towards said needle to discharge the liquid through said needle thereafter discontinuing the effective pumping movement of said piston, said discontinuing means comprising a recess in said piston having a forward end closed by a membrane of said piston with said stem having a pointed end engageable with said membrane upon the first movement of said stem toward said needle to puncture said membrane to allow fluid to flow through said piston discontinuing its effective pumping movement upon a second movement upon said stem.