FLUID EXTRACTION DEVICE

• US 3,577,980 A
• Filed: 05/28/1968
• Issued: 05/11/1971
• Est. Priority Date: 05/28/1968
• Status: Expired due to Term

• Current Assignee: Milton J. Cohen
• Original Assignee: Milton J. Cohen
• Inventors: Cohen, Milton J.
• Application Number:
  US04/732,617
• Time in Patent Office: 1,078 Days
• US Class Current: 600/578
• 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 5/150236 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 5/150351 Caps, stoppers or lids for sealing or closing a blood collection vessel or container, e.g. a test-tube or syringe barrel caps for bottles or containers in general B65D41/00
• CPC Class Codes: A61B 5/150389 Hollow piercing elements, e.g. canulas, needles, for piercing the skin
• CPC Class Codes: A61B 5/150519 Details of construction of hub, i.e. element used to attach the single-ended needle to a piercing device or sampling device
• CPC Class Codes: A61B 5/153 Devices specially adapted for taking samples of venous or arterial blood, e.g. with syringes
• CPC Class Codes: A61M 5/315 Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
• CPC Class Codes: B01L 3/0217 of the plunger pump type medical syringes A61M
• CPC Class Codes: B01L 3/508 rigid containers not provided for above
• CPC Class Codes: B01L 3/5082 Test tubes per se
• CPC Class Codes: B01L 3/5453 for test tubes
• CPC Class Codes: C07D 209/96 Spiro-condensed ring systems
• CPC Class Codes: G01N 35/02 using a plurality of sample containers moved by a conveyor system past one or more treatment or analysis stations G01N35/0098 and G01N35/0099 take precedence

Abstract

An instant vacuum fluid extraction device in the form of a vial sealed at one end by a valve and having an axially movable piston member therein shiftable from extended to retracted positions for generating a vacuum within the sealed container during movement to retracted position and means for latching the piston in its retracted position.

Claims

1. A fluid extraction device comprising a vial having openings at its forward and rearward ends in communication with the interior of the vial, a hollow needle, a valve member mounted on the forward end of the vial to seal the forward end of the vial with means on the forward end of the valve member for mounting the needle in alignment with the vial and a valve interposed between the end of the needle and the vial for sealing the vial when in normally closed position and for establishing communication between the interior of the vial and the needle when in operated position, a piston plug mounted for axial movement in sealing engagement with the interior wall of the vial between forward and retracted positions of adjustment, and actuator rod dimensioned to extend through the opening in the rearward end of the vial into connection with the piston plug for axial displacement of the plug between forward and retracted positions of adjustment with displacement toward retracted position being effected while the valve is in closed position to generate a vacuum within the vial between the piston plug and valve, and means for locking the plug in retracted position for maintaining vacuum conditions within the vial when the valve is closed.

2. An extraction device as claimed in claim 1 which includes a needle cover for covering the needle during nonuse.

3. An extraction device as claimed in claim 1 in which the valve is formed of a resilient material having a forward passage extending rearwardly from the forward end of the valve member and dimensioned to receive an eNd of the needle and a rearward passage extending forwardly from the rearward end of the plug in communication with the vial and a slitted portion extending from the forward end of the rearward passage to the rearward end of the forward passage for connecting said passages when in position.

4. An extraction device as claimed in claim 3 in which the slitted portion between the passages is located beyond the forward end of the vial to enable flexure alongside the slitted portion to open the slit.

5. An extraction device as claimed in claim 1 in which the piston plug comprises a cylindrical member formed of resilient material dimensioned to extend outwardly into sealing engagement with the surrounding walls of the vial.

6. An extraction device as claimed in claim 1 in which the means for locking the plug in retracted position comprises outwardly extending wings on the forward end portion of the actuator and a slotted opening in the rearward wall of the vial beyond which the wings extend when the piston plug is in retracted position whereby the plug, in retracted position, can be turned to offset the wings from the slotted opening.

7. An extraction device as claimed in claim 1 in which the means for locking the piston plug in retracted position comprises a tubular feed section connected with the actuator rod at its rearward end portion and dimensioned to overlap the vial, in its forward position, by an amount corresponding to the length of travel of the plug between forward and retracted position and having a cross-sectional dimension at its forward end snugly to embrace the vial whereby the rearward end wall of the vial confronts the end of the sleeve as it clears the vial in retracted position.

8. A method for providing a fluid extraction device as claimed in claim 1 with a vacuum for the extraction of fluid immediately prior to fluid extraction comprising the steps of displacing the piston plug in the vial from a forward position to a retracted position while the valve is in closed position to generate a vacuum within the vial, and latching the plug in retracted position to maintain the vacuum within the vial.

9. A method for fluid extraction comprising providing a fluid extraction device as claimed in claim 1 with a vacuum for the extraction of fluid immediately prior to fluid extraction by displacing the piston plug in the vial from a forward position to a retracted position while the valve is in closed position to generate a vacuum within the vial, latching the plug in retracted position to maintain the vacuum within the vial, inserting the needle into the source of fluid to be extracted, opening the valve for communicating the interior of the vial with the fluid source whereby the vacuum conditions existing within the vial effect withdrawal of fluid from the source into the vial.