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Needleless injector

  • US 6,939,323 B2
  • Filed: 07/19/2002
  • Issued: 09/06/2005
  • Est. Priority Date: 10/26/2001
  • Status: Active Grant
First Claim
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1. An injector, comprising:

  • a housing having a chamber for holding a liquid formulation of an active principle to be injected into a biological body and an output port in fluid communication with the chamber, the liquid fomulation being injected through the output port;

    a piston positioned within the housing, the piston including an end portion with substantially the same shape as the chamber; and

    an actuator attached to the piston and adapted to force the piston away from the housing in opposition to a magnetic force, the piston and housing being drawn together by a magnetic force in response to the actuator relaxing its force on the piston to expel the liquid formulation out of the chamber through the output port.

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