Reservoir for flood withdrawal

• US 20030109806A1
• Filed: 12/10/2002
• Published: 06/12/2003
• Est. Priority Date: 12/11/2001
• Status: Abandoned Application

• Current Assignee: Smiths Medical Deutschland GmbH (Smiths Group International Holdings Ltd.)
• Original Assignee: Smiths Medical Deutschland GmbH (Smiths Group International Holdings Ltd.)
• Inventors: Pfandl, Peter, Weber, Jorg
• Application Number:
  US10/315,351
• Publication Number:
  US 20030109806A1
• Time in Patent Office: Days
• US Class Current: 600/578
• CPC Class Codes: A61B 5/15003 for venous or arterial blood
• 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 5/150992 Blood sampling from a fluid line external to a patient, such as a catheter line, combined with an infusion line; blood sampling from indwelling needle sets, e.g. sealable ports, luer couplings, valves tubing connectors and couplings A61M39/00

Abstract

The reservoir for blood withdrawal has a housing (1) and a displaceable piston (7) located therein by means of which, in the interior of the housing, a reservoir chamber (16) of variable size can be formed. A piston is coupled to an actuation device (11). Furthermore, the piston (7) is pressed by a first spring (14) into a closed position in which the reservoir chamber (16) has a minimum volume. The actuation device (11) and the piston (7) are loosely coupled to each other by a second spring (10), where the spring excursion of this spring (10) is smaller than the movement path (13) of the actuation device, so that, at the end of the movement, a forced coupling between the piston and the actuation device (11) occurs.

Claims

1. Reservoir for blood withdrawal having a housing (1) defining a chamber (16), a piston (7) in said housing movable by an actuation device (11), one direction of movement of the piston (7) being supported by a spring (14),the spring (14) being adapted to press the piston (7) into a closed position in which the chamber (16) of the housing (1) has its minimum volume.

2. Reservoir according to claim 1, characterized in that the piston (7) and the actuation device (11) are coupled to each other by a second spring (10).

3. Reservoir according to claim 2, characterized in that the piston (7) is rigidly connected to a first catch (8), the actuation device (11) is rigidly connected to a second catch (9), and

the first and second catches (8 and 9) are coupled to each other by means of the second spring (10) in such a manner that, during an opening movement of the piston (7), the second catch (9) moves, by means of the second spring (10), the first catch and thus the piston.

4. Reservoir according to claim 3, characterized in that the spring excursion of the second spring is smaller than the maximum possible movement path of the second catch 9, so that at the end of the spring stroke excursion of the second spring (10), a forced coupling between the actuation device (11) and the piston (7) occurs.

5. Reservoir according to claim 1, characterized in that the housing (1), in the axial direction, presents a first connection (2) and a second connection (3), and a rigid pipe (6) is centrally located with respect to the axis of the housing (1), where one end of the pipe is connected to the first connection (2) and the other end opens into the chamber (16).

6. Reservoir according to claim 1, characterized in that, the housing is provided with a longitudinal slit (13) the actuation device (11) penetrates through which via a pin (12) to which the second catch (9) is connected.

7. Reservoir according to claim 6, characterized in that the slit (13) presents a bayonet locking mechanism (13.1) for the pin (12).

8. Reservoir according to claim 1, characterized in that, for the action, a roll seal (15) is provided between the internal wall of the housing (1) and the piston (7).

9. Reservoir according to claim 8, characterized in that the roll seal (15) is attached, on the one hand, to the internal wall of the housing (1) and, on the other hand, to the first catch (8) or to the second catch (9).