A lancing system can include a first device body having a lancing end and a free end, the lancing end including a sealing device, a lancing assembly having a lance coupler slideably coupled with the lancing end, a main shaft slideably coupled with the body, a first piston disposed within the body, wherein the lancing assembly is adapted to create a vacuum prior to lancing and dissipate the vacuum at a controlled rate. The system can include a second device body fluidicly coupled to the first device body and having a second shaft and a second piston. A method of extracting blood can include coupling the sealing device to a surface, creating a vacuum, lancing the surface, and dissipating the vacuum at a controlled rate.