Autoflush Syringe Method

• US 20100114068A2
• Filed: 07/22/2009
• Published: 05/06/2010
• Est. Priority Date: 05/02/2005
• Status: Active Grant

• Current Assignee: Bee Sight LLC
• Original Assignee: Preventiv, Inc.
• Inventors: Lee, Martin
• Granted Patent: US 8,075,547 B2
• Time in Patent Office: Days
• US Class Current: 604/518
• CPC Class Codes: A61M 2005/1787 Syringes for sequential delivery of fluids, e.g. first medicament and then flushing liquid
• CPC Class Codes: A61M 2005/31508 provided on the piston-rod
• CPC Class Codes: A61M 2005/31598 having multiple telescopically sliding coaxial pistons encompassing volumes for components to be mixed
• CPC Class Codes: A61M 5/31596 comprising means for injection of two or more media, e.g. by mixing

Abstract

A two-chambered, sequentially injectable syringe is disclosed. The syringe has two concentric barrels, substantially cylindrical in shape. The outer barrel has an open end adapted for receiving an inner barrel/first piston. The inner barrel/first piston contains a flushing liquid. The syringe has a second piston slidably movable in the inner barrel and a latching mechanism that can alternate between a locked configuration and an unlocked configuration. In the locked configuration, the latching mechanism prevents the second piston from substantially all longitudinal movement relative to the inner barrel. In the unlocked configuration, the latching mechanism permits longitudinal motion of the second piston within the inner barrel.

Claims

1. A method of using a two-chambered syringe, the method comprising:

expelling a first liquid from a first chamber through a first chamber outlet by moving a first chamber seal within the first chamber, wherein a second chamber is connected to the first chamber seal and movably disposed with the first chamber seal within the first chamber;

moving a latching mechanism from a first position in which movement between the first chamber seal and a second chamber seal is prevented, to a second position in which movement between the first chamber seal and the second chamber seal is permitted; and

expelling a second liquid through a second chamber outlet and the first chamber outlet by moving the second chamber seal within the second chamber.

2. The method of claim 1, the expelling a first liquid step further comprising moving a single handle, operably connected to the second chamber seal, to move the first chamber seal within the first chamber when the latching mechanism is in the first position.

3. The method of claim 1, the expelling a second liquid step further comprising moving a single handle, operably connected to the second chamber seal, to move the second chamber seal within the second chamber when the latching mechanism is in the second position.

4. The method of claim 1, the moving step further comprising moving a single handle, rotatably mounted within the syringe, from a first angular position in which the latching mechanism is in the first position to a second angular position in which the latching mechanism is in the second position.

5. The method of claim 1, further comprising:

positioning the latching mechanism in the first position; and

drawing the first liquid into the first chamber, such that the second liquid and the first liquid do not come in contact with each other.

6. The method of claim 5, the drawing step further comprising drawing the first liquid into the first chamber such that basic fluid mechanics prevents the first liquid from entering the second chamber outlet such that the two fluids do not come into contact with each other.

7. The method of claim 5, wherein the second liquid completely fills the second chamber, the drawing step further comprising drawing the first liquid into the first chamber such that negative pressure created inside the first chamber is not great enough to displace the second liquid out of the second chamber due to basic fluid mechanics.

8. The method of claim 5, the drawing step further comprising drawing the first liquid into the first chamber by moving the first chamber seal within the first chamber.