Sample probes and methods for sampling intracellular material
A sample probe includes a tip including a distal end for penetrating a cellular membrane, an opening located at or proximal to the distal end, and tip microchannels extending through the tip and communicating with the opening; and a body adjoining the tip and including body microchannels, wherein at least one of the body microchannels communicates with at least one of the tip microchannels. A method for sampling intracellular material includes inserting a probe tip through a cellular membrane; aspirating intracellular material from the cell, through an opening of the tip, and into a first microchannel of the tip; flowing isolator fluid from a second microchannel of the tip into the first microchannel to form a plug of intracellular material; and aspirating the plug and the isolator fluid through the first microchannel.
1. A sample probe, comprising:
a tip comprising a distal end extending along a first direction and configured for penetrating a cellular membrane, an opening located at or proximal to the distal end, and a plurality of tip microchannels extending through the tip and communicating with the opening; and
a body adjoining the tip and comprising a plurality of body microchannels, wherein the body extends along a second direction perpendicular to the first direction, and at least one of the body microchannels communicates with at least one of the tip microchannels,
wherein the plurality of tip microchannels or body microchannels comprises:
a first microchannel comprising a first section and a second section, the first section interconnecting the second section with the opening and having a first characteristic dimension, and the second section having a second characteristic dimension greater than the first characteristic dimension; and
a second microchannel communicating with the first microchannel at or near a junction between the first section and the second section.
2. The sample probe of claim 1 , wherein the body is a deflectable cantilever suitable for atomic force microscopy.
3. The sample probe of claim 1 , wherein each tip microchannel has a cross-sectional dimension ranging from 0.1 μm to 100 μm.
4. The sample probe of claim 1 , wherein the distal end comprises an annular apex circumscribing a cavity extending into the tip, and the opening communicates with the cavity.
5. The sample probe of claim 1 , wherein the opening comprises a plurality of orifices, each orifice communicating with at least one of the tip microchannels.
6. The sample probe of claim 1 , wherein one of the tip microchannels is a common microchannel interconnecting the opening with at least two other tip microchannels at a junction in the tip.
7. The sample probe of claim 1 , comprising a sensor communicating with the first microchannel and configured for producing a signal indicative of a type of fluid passing through the junction.
8. The sample probe of claim 1 , comprising a first pump configured for transporting fluid from at least one of the tip microchannels to the opening, and a second pump configured for aspirating fluid from the opening to at least one other tip microchannel.