Laminated sliding stopper for a syringe

• US 4,997,423 A
• Filed: 06/14/1989
• Issued: 03/05/1991
• Est. Priority Date: 10/15/1986
• Status: Expired due to Term

• Current Assignee: Daikyo Gomu Seiko,Ltd.
• Original Assignee: Daikyo Gomu Seiko,Ltd.
• Inventors: Okuda, Tamotsu, Muraki, Tomoyasu
• Primary Examiner(s): Yasko, John D.
• Application Number:
  US07/366,279
• Time in Patent Office: 629 Days
• Field of Search: 604/230, 604/187, 604/218, 604/207
• US Class Current: 604/230
• CPC Class Codes: A61M 2205/0222 Materials for reducing friction
• CPC Class Codes: A61M 2205/0238 the material being a coating or protective layer
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 5/2429 by telescoping of ampoules or carpules with the syringe body
• CPC Class Codes: A61M 5/31513 Piston constructions to improve sealing or sliding

Abstract

A laminated sliding stopper for a syringe, excellent in sliding or moving property and free from contamination of an injection liquid, is provided which consists of a rubber elastic body whose part to be contacted with the injection liquid and sliding part on the inner wall of the barrel are fully laminated with a film of tetrafluoroethylene.

Claims

1. A sliding stopper for a syringe, consisting of a rubber elastic body whose part to be contacted with a liquid medicament and sliding part on an inner wall of a barrel are fully laminated with a film of tetrafluoroethylene.

2. The sliding stopper as claimed in claim 1, wherein the film of tetrafluoroethylene has a thickness of 0.01 to 0.2 mm.

3. The sliding stopper as claimed in claim 1, wherein the syringe additionally serves as a container for a medicament.

4. The sliding stopper as claimed in claim 1, wherein the film of tetrafluoroethylene is colored.

5. The sliding stopper as claimed in claim 4, wherein the coloring is carried out by the use of a coloring agent selected from the group consisting of ultramarine blue, carbon black and red oxide.

6. The sliding stopper as claimed in claim 1, wherein the rubber elastic body is made of a rubber or elastic material selected from the group consisting of isoprene, butadiene, styrene-butadiene, ethylene-propylene, isoprene-isobutylene and nitrile rubbers.