Method for high throughput drop dispensing of specific patterns
The invention relates to methods and systems for high throughput precision “on-the-fly” dispensing of sub-microfluidic quantities of reagents and other liquids in specific patterns onto or into a target substrate. In certain embodiments, a high speed process is provided for creating and/or repeating spaced lines or line segments by dispensing spaced arrays of drops on a target. One example of a target is a biosensor or the like with spaced electrodes, wherein each electrode receives a dispensed line.
1 . A method for high throughput dispensing of liquid droplets on a target to create a predetermined pattern on the target using a non-contact dispenser, comprising:
substantially continuously moving said dispenser across said target;
dispensing a plurality of liquid drops from said dispenser onto a first sub-target located on said target to form a first line of dispensed liquid on said sub-target;
discontinue dispensing liquid from said dispenser while said dispenser continues to move across said target;
dispensing a plurality of liquid drops from said dispenser onto a second sub-target located on said target and spaced from said first sub-target to form a second line of dispensed liquid on said second sub-target; and
continuing the above steps until said pattern has been formed on said target.
2 . The method of claim 1 , wherein said liquid comprises a reagent.
3 . The method of claim 1 , wherein said liquid comprises a biological reagent or material.
4 . The method of claim 1 , wherein said liquid comprises a chemical reagent or material.
5 . The method of claim 1 , wherein said target comprises a biosensor
6 . The method of claim 5 , wherein said sub-targets comprise electrodes.
7 . The method of claim 6 , wherein said liquid comprises a biological or chemical reagent or material.
8 . The method of claim 7 , wherein said electrodes are arranged in at least one row.
9 . The method of claim 8 , wherein said lines form a linear array of lines on said biosensor.
10 . The method of claim 9 , wherein each of said lines on said electrodes comprises a linear array of a plurality of liquid drops or dots.
11 . The method of claim 1 , wherein said liquid is degassed prior to dispensing.
12 . The method of claim 11 , wherein the degassing comprises pressurizing the liquid by providing a static pressure from a helium source over the liquid to degas the liquid.
13 . The method of claim 1 , wherein the droplet size is in the range 0.1 nanoliters (nL) or 100 picoliters (pL) to about 5,000 nL or 5 microliters (μL).
14 . The method of claim 1 , wherein is in the range from about 0.1 nL or 100 pL to about 1 nL.
15 . The method of claim 1 , wherein is in the range from about 1 nL to about 10 nL.
16 . The method of claim 1 , wherein the dispenser is serially connected to a positive displacement device which meters the liquid to the dispenser
17 . The method of claim 1 , wherein the dispenser comprises an actuator that includes a valve.
18 . The method of claim 1 , wherein said method further comprises creating a user-defined text file containing lists of white space delimited numbers defining a dispense pattern that is to be formed on said target.
19 . The method of claim 18 , wherein said text file is accessible by a controller through a software program such that rapid and accurate dispensing is performed.
20 . The method of claim 1 , wherein said method further comprises forming a volume of said liquid for ejection from said dispenser onto said target by opening and closing a valve of said dispenser at a frequency such that the operation of said valve is mechanically modulated so that it remains open in oscillation to facilitate ejection of said volume.