Back to results
US 8,722,178 B2Granted
Syringe stopper
AssigneeW. L. Gore & Associates, Inc.
InventorsEdgar G. Ashmead, Edward C. Gunzel, Michael P. Moritz
Life of this patent
Estimating the term…
Abstract
A syringe stopper that is suitable for use in syringes without silicone oil or other liquid lubricants. The invention provides a low friction barrier between an elastomeric stopper material and a therapeutic in the syringe. The barrier may inhibit materials from leaching from the elastomer material or from extraction of compounds from medicants by the elastomer. A process is also described that allows for molding thin barrier layers while allowing adequate bonding with the elastomer.
Claims15
A syringe stopper comprising:
- a) an elastomeric body,
- b) a composite layer having a first side consisting of an expanded fluoropolymer and a second side comprising a thermoplastic fluoropolymer, and
- c) a densified ePTFE film wherein the composite layer is adjacent to the elastomeric body and the densified ePTFE film is adjacent to the second side of the composite layer.
An article comprising:
- a) an elastomeric body;
- b) a composite layer having a first side consisting of an expanded fluoropolymer and a second side comprising a thermoplastic fluoropolymer selected from the group consisting of fluorinated ethylene propylene (FEP), perfluoroalkoxy (PFA) and tetrafluoroethylene hexafluoropropylene vinylidene fluoride terpolymer (THV);
- and
- c) a fluoropolymer film,
- wherein the first side of the composite layer is bonded to the elastomeric body and the second side of the composite is bonded to the fluoropolymer film.
2 more elements
An article comprising:
- a) an elastomeric body,
- b) a first expanded PTFE film bonded to the elastomeric body, and
- c) a second expanded PTFE film bonded to said first expanded PTFE film,
- wherein the density of said second expanded PTFE film is greater than the density of said first expanded PTFE film.
1 more element
Dependencies are inferred from the claim text.