Claims
- 1. A liquid measuring device that measures a fixed volume of liquid comprising:
a first barrel having a proximal and distal end; a gas or vapor permeable but liquid impermeable barrier situated in the barrel between the proximal and distal ends, whereby the liquid can only be filled up to the barrier; and a coupling device comprising an insert which is H-shaped in cross-sectional view to adapt the barrier to the measuring device.
- 2. The liquid measuring device of claim 1, further comprising a retainer on the distal end.
- 3. The liquid measuring device of claim 2, wherein the retainer comprises a valve.
- 4. The liquid measuring device of claim 1, further comprising a needle on the distal end.
- 5. The liquid measuring device of claim 1, further comprising a second barrel which is in fluid communication with said first barrel by means of a valve.
- 6. The liquid measuring device of claim 1, wherein the insert is adjustable to position the barrier.
- 7. The liquid measuring device of claim 1, wherein the volume in the barrel up to the barrier equals said fixed volume.
- 8. The liquid measuring device of claim 1, wherein said gas or vapor permeable but liquid impermeable barrier comprises hydrophobic material.
- 9. The liquid measuring device of claim 1 which is a pipette.
- 10. The liquid measuring device of claim 1 which is a syringe.
- 11. A liquid measuring device that measures a fixed volume of liquid comprising:
a first barrel having a proximal and distal end; a gas or vapor permeable but liquid impermeable barrier situated in the barrel between the proximal and distal ends, whereby the liquid can only be filled up to the barrier; and a coupling device comprising an insert which is movable along the barrel to adapt the barrier to the measuring device, whereby the fixed volume of liquid is adjusted by moving said insert along the barrel.
- 12. The liquid measuring device of claim 11, wherein the volume in the barrel up to the barrier equals said fixed volume.
- 13. The liquid measuring device of claim 11, further comprising a holder to position and secure said insert in the liquid measuring device.
- 14. The liquid measuring device of claim 13, wherein the insert is moved to a desired position by means of a screw.
- 15. The liquid measuring device of claim 11 which is a pipette.
- 16. The liquid measuring device of claim 11 which is a syringe.
- 17. The liquid measuring device of claim 11, which further comprises a second barrel which is in fluid communication with said first barrel by means of a valve.
- 18. The liquid measuring device of claim 11, further comprising a needle at the distal end.
- 19. The liquid measuring device of claim 11 further comprising a valve at the distal end.
- 20. The liquid measuring device of claim 11, wherein said gas or vapor permeable but liquid impermeable barrier comprises hydrophobic material.
RELATED APPLICATIONS
[0001] This application is a continuation of U.S. Ser. No. 09/810,875, filed Mar. 16, 2001.
Continuations (1)
|
Number |
Date |
Country |
Parent |
09810875 |
Mar 2001 |
US |
Child |
10042906 |
Jan 2002 |
US |