| 摘要 |
This invention relates to a piston (1) in a <<piston-type>> nursing device comprising a cylindrical receptacle (15), a rubber mouthpiece (16) secured to one end thereof, and a piston (1) slidably inserted in the receptacle (15), The piston (1) consists of a short cylindrical body (3) and a flexible elastic rubber sealer (2) mounted detachably on said body (3), said sealer (2) having a concaved head cap portion (11) extending from the inner circumferential edge of an annular base (10) and an annular seal portion (12) extending from the peripheral edge of said base (10).
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