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CARTRIDGE SYRINGE

  • US 3,811,441 A
  • Filed: 02/10/1972
  • Issued: 05/21/1974
  • Est. Priority Date: 02/10/1972
  • Status: Expired due to Term
First Claim
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1. A syringe comprising in combination, a holder comprising a cylindrical barrel, said barrel having a tapered neck at one end substantially closing said end, said tapered neck having a centrally extending small through-bore, the other and open end of the barrel having an integral locking flange extending peripherally and outwardly therearound, an ampoule slidably fitted Within the barrel, said ampoule comprising a cylindrical body having a reduced opening at one end thereof, a resilient plug closing said opening, a piston slidably positioned in the body near the other open end of the body and in sealing relation thereto, a medicament in the ampoule between the closed end and the piston, sealing means integral with the inner face of the holder barrel adjacent its open end and frictionally engaging the entire periphery of the ampoule body, a latch cap fitting over the open end of the ampoule cylindrical body, said latch cap comprising a circular base having a central opening therethrough, said base having a flat inner face engaging the edge of the open end of the ampoule body, a pair of oppositely disposed latches extending from the latch cap base over the ampoule body and engaging the locking flange on the holder barrel to retain the ampoule in position within the holder, each latch having first and second longitudinally spaced catches, each catch being adapted to engage the locking flange, the first catch being spaced a greater distance from the flat inner face of the cap base than the second catch, a cannula assembly affixed to the closed end of the holder, said assembly comprising a tapered cannula hub, a cannula extending through and secured to said hub, the cannula hub fitting over and secured to the tapered neck of the holder barrel, said cannula having an open end extending outwardly of the hub with the remainder of said needle extending through the through-bore in the holder necked portion into the interior of the holder barrel, the needle end in the barrel being closed, said needle having a lateral opening adjacent its closed end, the ampoule being positioned within the holder barrel so that the resilient plug in its closed end is spaced from the closed end of the cannula, said ampoule being held in such position by means of the latch cap and the sealing means wherein the open end edge of the ampoule body engages the inner flat face of the latch base and the first catch of each latch engages the locking flange, further when the medicament is to be ejected the latch cap is pushed in the direction of the cannula whereby the second catches engage the locking flange to hold the ampoule in a position wherein the cannula has pierced the resilient plug and the side opening in the cannula is in communication with the medicament in the ampoule whereupon the piston may be moved toward the cannula to inject the medicament.

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