Yoshino Kogyosho Co., Ltd.

Kuraray Noritake Dental Inc.

Yasujiro Ohara

Satoshi Sakamoto

Katsuhito Kuwahara

Toru Toma

Hideto Kunishi

A syringe has a dripless feature by using an O-ring located between a conical disc and a flat plunger disc in an annular groove on a moving plunger. The flat plunger disc has a series of projections that offset the o-ring off the flat plunger disc surface when the plunger is not actuated. When the plunger is actuated, the o-ring distorts to rest on the projections and also on the surface of the flat plunger disc. When the plunger is released, the o-ring's resiliency pulls the o-ring back to its original shape which sucks back the fluid being dispensed so that no or less drips occur.

Growing community of inventors

Tokyo, Japan

Yasujiro Ohara