Fig. 1. Schematic representation of the MasSpec Pen system and operational steps. Schematic representation of the MasSpec Pen system and operational steps.

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Fig. 1. Schematic representation of the MasSpec Pen system and operational steps. Schematic representation of the MasSpec Pen system and operational steps. (A) The pen-sized handheld device is directly integrated into a laboratory-built MS interface through PTFE tubing. The integrated MS interface houses the pinch valves, microcontroller, and tubing to connect the system to the mass spectrometer inlet. The system is triggered by the user through a foot pedal. (B) The MasSpec Pen (handheld device) is designed with a PDMS tip and three PTFE conduits, which provide incoming water (1) and gas (2) to the tip and an outgoing conduit for the water droplet (3). (C) The tip contacts the tissue for analysis. Inset shows the three conduits (1 to 3) and solvent reservoir (4) within the tip. When the system is triggered (t = 0 s) by using the foot pedal, the syringe pump delivers a controlled volume of water to the reservoir. The discrete water droplet interacts with the tissue to extract the molecules (t = 2 s). After 3 s of extraction, the vacuum and the gas conduits are concomitantly opened (arrows) to transport the droplet from the MasSpec Pen to the mass spectrometer through the tubing system for molecular analysis. Jialing Zhang et al., Sci Transl Med 2017;9:eaan3968 Published by AAAS