# US 4,997,423 A · Laminated sliding stopper for a syringe

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- Number: US 4,997,423 A
- Document ID: US4997423A
- Status: Granted
- Kind: A
- Application number: 07/366,279
- Filed: 1989-06-14
- Granted: 1991-03-05
- Earliest claimed: 1986-10-15
- Assignees: Daikyo Gomu Seiko Ltd.
- Inventors: Tamotsu Okuda; Tomoyasu Muraki
- Web page: https://patentgrep.com/patent/US4997423A

## CPC

- A61M 5/2429: {by telescoping of ampoules or carpules with the syringe body}
- A61M 5/31513: {Piston constructions to improve sealing or sliding}
- A61M 2205/0222: Materials for reducing friction
- A61M 2205/0238: the material being a coating or protective layer
- A61M 2205/583: by visual feedback
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## 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

### Claim 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 1)

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.