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Pharmaceutical syringe piston and method and device therefor

  • US 20040099994A1
  • Filed: 11/12/2003
  • Published: 05/27/2004
  • Est. Priority Date: 05/11/2001
  • Status: Active Grant
First Claim
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1. A method for producing a pharmaceutical piston stopper (2) made substantially from an elastomer and comprising a receiving cavity (6) for connecting with a displacement transferring element and a piston section (8) enclosed in a cap-shaped inert film (9

  • ), the piston section in a working position facing contents of a syringe or carpule cylinder (1), an outer circumference of the piston section with its inert film (9

    ) abutting against the syringe or carpule cylinder (1), the piston stopper (2) having an uncoated sealing section (10) adjacent to the piston section (8), the method comprising;

    placing a layered arrangement comprising a non-vulcanized rubber sheet (7) and an inert film (9) into a forming tool and forming the layered arrangement into a piston stopper under the influence of pressure and heat during a forming operation, wherein the rubber sheet (7) is vulcanized and joined with the inert film (9) in an non-detachable manner;

    forming the complete contour of the piston stopper (2) during the forming operation from the layered arrangement up to a layered arrangement flange (16) protruding laterally beyond the piston stopper (2) and remaining in a region of a partition plane of the forming tool;

    producing the receiving cavity (6) in the rubber sheet (7) beyond the flange (16) in the piston section (8) during the forming operation;

    displacing at least a wall region of the sealing section (10) bordering the receiving cavity (6) and protruding beyond the flange (16) into a receiving cavity (6) during a separating operation; and

    separating the piston stopper (2) from the flange (16) by a blanking operation, so that in the sealing section (10) an annular continuous sealing zone (13) is formed that directly adjoins an edge of the inert film (9

    ) that envelopes the piston section (8), the sealing zone in a working position abutting against the syringe or carpule cylinder (1).

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