SYRINGE

• US 3,747,812 A
• Filed: 10/21/1971
• Issued: 07/24/1973
• Est. Priority Date: 10/21/1971
• Status: Expired due to Term

• Current Assignee: Harvey Karman, Leo Wolf, Milton Robins
• Original Assignee: Harvey Karman, Leo Wolf, Milton Robins
• Inventors: Karman, Harvey, Robins, Milton, Wolf, Leo
• Primary Examiner(s): Reeves, Robert B.
• Assistant Examiner(s): Rolla, Joseph J.
• Application Number:
  US05/191,512
• Time in Patent Office: 642 Days
• Field of Search: 222/387,375,380,386,548,549,550,400.8,309,320,331,337,357 128/215,218R,218P,218PA,218NV,218C,218G,234,214C,274,278
• US Class Current: 222/387
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• CPC Class Codes: A61B 5/150099 by negative pressure, other than vacuum extraction into a syringe by pulling on the piston rod or into pre-evacuated tubes
• CPC Class Codes: A61B 5/150213 Venting means
• CPC Class Codes: A61B 5/150221 Valves
• CPC Class Codes: A61B 5/150236 Pistons, i.e. cylindrical bodies that sit inside the syringe barrel, typically with an air tight seal, and slide in the barrel to create a vacuum or to expel blood
• CPC Class Codes: A61B 5/150244 Rods for actuating or driving the piston, i.e. the cylindrical body that sits inside the syringe barrel, typically with an air tight seal, and slides in the barrel to create a vacuum or to expel blood
• CPC Class Codes: A61B 5/150259 Improved gripping, e.g. with high friction pattern or projections on the housing surface or an ergonometric shape
• CPC Class Codes: A61B 5/150389 Hollow piercing elements, e.g. canulas, needles, for piercing the skin
• CPC Class Codes: A61B 5/150396 Specific tip design, e.g. for improved penetration characteristics
• CPC Class Codes: A61B 5/150503 Single-ended needles hollow piercing element tip design A61B5/150396, needle sets for catheters A61M25/06, needles for bringing media into the body A61M5/32
• CPC Class Codes: A61B 5/150946 Means for varying, regulating, indicating or limiting the speed or time of blood collection
• CPC Class Codes: A61B 5/153 Devices specially adapted for taking samples of venous or arterial blood, e.g. with syringes
• CPC Class Codes: A61B 5/154 Devices using pre-evacuated means
• CPC Class Codes: A61M 2005/3128 Incorporating one-way valves, e.g. pressure-relief or non-return valves
• CPC Class Codes: A61M 5/3134 characterised by constructional features of the distal end, i.e. end closest to the tip of the needle cannula
• CPC Class Codes: A61M 5/31505 Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit

Abstract

A syringe particularly suited for producing and retaining a vacuum and utilizing the vacuum for drawing material into the syringe. A body with a plunger moving therein between piston in and out positions, and means for locking the plunger in the out position to maintain the vacuum and prevent accidental inward movement of the piston and limit outward movement. A plunger shaft with a shear zone for breaking off the shaft after producing the vacuum. A valve at the inlet and operable between open and closed positions for holding a vacuum and for controlling flow into the syringe. A check valve adjacent the inlet permitting fluid flow from the body.

Claims

1. In a syringe for providing a vacuum at an inlet and including a body having a bore communicating with the syringe inlet and a plunger having a piston slidably positioned within said bore for movement by a plunger shaft projecting from a plunger end of said bore opposite said inlet, between a first position with said piston adjacent said inlet and a second position with said piston adjacent said plunger end, the improvement comprising valve means carried on said plunger body between said bore and inlet for controlling fluid flow therebetween, said valve means including:

fIrst and second valve members; and

means for joining said valve members in side-by-side relation for rotation of one member relative to the other about an axis parallel to the axis of said plunger;

said first member having a first passage aligned with and communicating with said bore and said second member having a second passage communicating with said inlet and a third passage spaced from said second passage with said second member rotatable between an open position providing a fluid flow path from said inlet through said second and first passages to said bore, and a closed position blocking said fluid flow path, and a discharge position with said first and third passages aligned.

2. In a syringe for providing a vacuum at an inlet and including a body having a bore communicating with the syringe inlet and a plunger having a piston slidably positioned within said bore for movement by a plunger shaft projecting from a plunger end of said bore opposite said inlet, between a first axial position with said piston adjacent said inlet and a second axial position with said piston adjacent said plunger end, the improvement comprising interengaging means on said body and plunger for locking said plunger in said second position, and including metal clips carried on oppositely projecting flanges of said body adjacent the plunger end, each of said clips projecting into said bore, with said shaft having a cruciform configuration with arms forming walls defining axially disposed clearance zones for said clips for axial movement of said shaft past said clips in a first angular position, with opposed shaft walls having slots for receiving said clips with said shaft rotated to a second angular position, with engagement of said clips and shaft at said slots locking said plunger in said second axial position, and with a turned up lip on each clip forming a stop for limiting angular rotation of said shaft.

3. In a syringe for providing a vacuum at an inlet and including a body having a bore communicating with the syringe inlet and a plunger having a piston slidably positioned within said bore for movement by a plunger shaft projecting from a plunger end of said bore opposite said inlet, between a first position with said piston adjacent said inlet and a second position with said piston adjacent said plunger end, the improvement comprising interengaging means on said body and the plunger for locking said plunger in said second position and including:

a shoulder on said body adjacent said plunger end; and

a column member carreed on said shaft remote from said piston and positioned along said shaft with a free end extending toward said piston and urged outward from said shaft so that said free end engages said shoulder when said plunger is moved to said second position.

4. A syringe as defined in claim 3 wherein said shaft is of cruciform configuration with two of said column members positioned in opposing interstices between the arms thereof.

5. A syringe as defined in claim 3 wherein said shaft is of cruciform configuration and said column member is of plastic tubing, with two of said column members positioned in opposing interstices between the arms of said shaft, and an o-ring about said shaft and column members remote from said piston.