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Bi-directional motion of a lorentz-force actuated needle-free injector (NFI)

  • US 9,789,256 B2
  • Filed: 10/02/2014
  • Issued: 10/17/2017
  • Est. Priority Date: 07/09/2008
  • Status: Expired due to Fees
First Claim
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1. A method for needle-free injection of a drug through a tissue into a biological body, the method comprising:

  • providing the drug in a chamber of a needle-free injection device;

    providing a gas in the chamber; and

    after providing the drug and the gas in the chamber, using a bi-directional electromagnetic actuator to drive a piston in the chamber to (1) fluidize the drug in the gas inside the chamber, and (2) to eject the fluidized drug from the chamber through a needle-free injection nozzle as a jet with sufficient pressure to penetrate the tissue of the biological body, wherein fluidizing the drug involves oscillating the piston using the electromagnetic actuator to facilitate fluidization of the drug in the gas.

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