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Needleless syringe using supersonic gas flow for particle delivery

  • US 5,899,880 A
  • Filed: 06/07/1995
  • Issued: 05/04/1999
  • Est. Priority Date: 04/08/1994
  • Status: Expired due to Term
First Claim
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1. A needleless syringe for delivering particles having a nominal particle size of at least about 10 μ

  • m, said syringe comprising;

    an elongate tubular nozzle having upstream and downstream ends, and a divergent downstream section;

    means for positioning a source of particles at the upstream end of the tubular nozzle; and

    energizing means for releasing compressed gas through a source of particles positioned at the upstream end of the nozzle and into the nozzle to produce within the nozzle a gas flow with particles entrained therein, wherein said gas flow is capable of delivering said particles to a target surface at a velocity of 200 m/sec or greater.

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