Pipette tip handling devices and methods
Discussed herein are methods and devices for storing, handling, loading or dispensing of pipette tips. Some embodiments allow repetitive loading of an array of multiple pipette tips that are stored in a nested configuration.
1. A plate through which pipette tips are ejected in a pipette tip dispensing device, comprising:
a substantially flat top surface, a substantially flat bottom surface and channels;
which channels comprise a first subset of channels and a second subset of channels for retaining an array of the pipette tips;
which channels comprise one or more channel features in or around each of the channels in the first subset of channels and one or more channel features in or around each of the channels in the second subset of channels,
the one or more channel features confer a first frictional force to the pipette tips in the array ejected through the first subset of channels and a second frictional force to the pipette tips in the array ejected through the second subset of channels, and
the second frictional force is different than the first frictional force.
2. The plate of claim 1 , wherein the one or more channel features that confers a different frictional force comprise channel diameter.
3. The plate of claim 1 , wherein the one or more channel features that confers a different frictional force comprises channel texture.
4. The plate of claim 1 , wherein the one or more channel features that confers a different frictional force is selected from the group consisting of: one of more projections around the channels and extending from the top surface of the barrier plate; one of more projections around the channels and extending from the bottom surface of the barrier plate; and one of more projections around the channels and extending from the top surface and the bottom surface of the barrier plate.
5. The plate of claim 1 , wherein the one or more channel features that confers a different frictional force comprise projections and the projections around the first subset of channels have one or more projection features different than the projections around the second subset of channels, which projection features are chosen from shape, size, length, thickness, width, texture, angle or a combination thereof.
6. The plate of claim 5 , wherein there are four (4) or more projections around each channel in the first subset of channels and there are four (4) or more projections around each channel in the second subset of channels.
7. The plate of claim 5 , wherein the projections around each channel in the first subset of channels extend at an internal angle of about 90 degrees from the bottom surface of the distal barrier plate.
8. The plate of claim 5 , wherein the projections around each channel in the first subset of channels extend at an internal angle of about 89° to about 80° from the bottom surface of the distal barrier plate.
9. The plate of claim 5 , wherein (a) the projections around each channel in the first subset of channels are not in the channels or (b) the projections around each channel in the second subset of channels are not in the channels.
10. The plate of claim 5 , wherein the projection feature comprises length.
11. The plate of claim 10 , wherein the projections around each channel in the first subset of channels independently are about 0.01 micrometers to about 2.0 millimeters in length.
12. The plate of claim 10 , wherein the projection features of the first subset of channels are shorter than the projection features of the second subset of channels.
13. The plate of claim 10 , comprising at least three subsets of channels that confer a different frictional force and wherein the third subset of channels surround the second subset of channels and the projection features of the second subset of channels are longer than the projection features of the third subset of channels.
14. The plate of claim 10 , comprising at least three subsets of channels that confer a different frictional force and wherein the third subset of channels surround the second subset of channels and the projection features of the second subset of channels are shorter than the projection features of the third subset of channels.
15. The plate of claim 1 , comprising 96,384 or more channels.
16. The plate of claim 1 , wherein the plate comprises a polymer.
17. A pipette tip dispensing device comprising a plate of claim 1 and a housing.