Liquid measuring device
AssigneeEthicon, Inc.
InventorsSzu-Min Lin, Peter Zhu
Life of this patent
Estimating the term…
Abstract
A liquid measuring device is described for carrying out the assay using a gas or vapor permeable but liquid impermeable membrane barrier to control the volume of liquid to be measured or transferred. The membrane may be used in any instance where a fixed volume of liquid needs to be measured.
Claims20
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 proximal to the first barrel, whereby the liquid can only be filled up to the barrier;
- and
- a couple device comprising the barrier which is H-shaped in cross-sectional view to adapt the barrier to the measuring device.
A liquid measuring device that measures a fixed volume of liquid comprising:
- a barrel having a proximal and distal end;
- a coupling device comprising a gas or vapor permeable but liquid impermeable barrier which is movable along the first barrel to adapt the barrier to the measuring device, whereby the fixed volume of liquid is adjusted by moving said coupling device along the first barrel;
- and
- a gas, vapor and liquid impermeable element adapted to the measuring device to provide a pressure difference between two sides of the barrier such that the liquid can only filled from the distal end of the first barrel up to the barrier, wherein the liquid measuring device is a syringe.
A liquid measuring device that measures a fixed volume of liquid comprising;
- a first barrel having a proximal and distal end;
- a coupling device comprising a gas or vapor permeable but liquid impermeable barrier which is movable along the first barrel to adapt the barrier to the measuring device, whereby the fixed volume of liquid is adjusted by moving said coupling device along the first barrel;
- a gas, vapor and liquid impermeable element adapted to the measuring device to provide a pressure difference between two sides of the barrier such that the liquid can only be filled from the distal end of the first barrel up to the barrier;
- and
- a needle at the distal end of the first barrel.
A liquid measuring device that measures a fixed volume of liquid comprising:
- a first barrel having a proximal and distal end;
- a coupling device comprising a gas or vapor permeable but liquid impermeable barrier which is movable along the first barrel to adapt the barrier to the measuring device, whereby the fixed volume of liquid is adjusted by moving said coupling device along the first barrel;
- a gas, vapor and liquid impermeable element adapted to the measuring device to provide a pressure difference between two sides of the barrier such that the liquid can only be filled from the distal end of the first barrel up to the barrier;
- and
- a vavle at the distal end of the first barrel.
The liquid measuring device of cliam 17, wherein the volume in the first barrel up to the barrier equals said fixed volume.
Dependencies are inferred from the claim text.