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US 2003/0209082 A1Published application
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.
Claims18
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 on a second barrel, said second barrel being 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 be filled from the distal end of the first barrel up to the barrier.
1 more element
A method of measuring a fixed volume of liquid comprising:
- (a) providing a device comprising:
- (i) a first barrel having a proximal and distal end;
- (ii) 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
- (iii) 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;
- (b) moving the gas or vapor permeable but liquid impermeable barrier along the first barrel, if necessary, to adjust the fixed volume;
- and
- (c) filling a volume formed by the distal end of the first barrel to the barrier with liquid wherein said volume is equal to the fixed volume.
5 more elements
Dependencies are inferred from the claim text.