Self-lubricating piston for pharmaceutical container

Expansible chamber devices – With lubricating means – Piston has lubricant retaining or conducting means

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Details

92160, 92247, 92248, 92249, F01B 3110

Patent

active

053536916

ABSTRACT:
A compressible seal member is provided with peripherally distributed and axially spaced lubricant retaining grooves, or with radially extending lubricant channels in communication with a central lubricant reservoir. The sealing member has land portions and groove portions on the outer periphery, with the lubricant grooves or channels located along the groove portions. The seal member is installed within a pharmaceutical container with the tool having a working end received within a central aperture formed in the seal member so that the insertion forced is applied near the bottom end of the seal member to prevent compression during installation. When the pharmaceutical is expelled from the container, a plunger pushes on the accessible end of the seal member to compress the seal member axially and force the lubricant out of the grooves or channels and into contact with the inner wall surfaces of the container. The seal member provides a good friction fit during storage of the container to prevent leakage of the pharmaceutical and provides low sliding friction to permit smooth translatory motion of the seal member during expulsion of the pharmaceutical.

REFERENCES:
patent: 331831 (1885-12-01), Simpson et al.
patent: 1613355 (1927-01-01), Miller
patent: 1882156 (1932-10-01), Miller
patent: 1949612 (1934-03-01), Mattair et al.
patent: 2211456 (1940-08-01), Caldwell
patent: 5052278 (1991-10-01), Smillie, III et al.

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