US PATENT SUBCLASS 604 / 222
.~.~.~.~.~.~ Seal ring mounted on piston

Current as of: June, 1999
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604 /   HD   SURGERY

19  DF  MEANS FOR INTRODUCING OR REMOVING MATERIAL FROM BODY FOR THERAPEUTIC PURPOSES (E.G., MEDICATING, IRRIGATING, ASPIRATING, ETC.) {7}
48  DF  .~ Treating material introduced into or removed from body orifice, or inserted or removed subcutaneously other than by diffusing through skin {9}
93  DF  .~.~ Material introduced or removed through conduit, holder, or implantable reservoir inserted in body {30}
181  DF  .~.~.~ Means moved by person to inject or remove fluent material to or from body inserted conduit, holder, or reservoir {3}
187  DF  .~.~.~.~ Injector or aspirator syringe supported only by person during use (e.g., hand held hypodermic syringe, douche tube with forced injection, etc.) {13}
218  DF  .~.~.~.~.~ With piston or plunger for expelling material from body or injector reservoir {15}
222.~.~.~.~.~.~ Seal ring mounted on piston

DEFINITION

Classification: 604/222

Seal ring mounted on piston:

(under subclass 218) Subject matter wherein the piston has a sealing means, usually deformable, circumferentially mounted thereon for engagement with the inside surface of the material container to prevent material leakage when the piston is moved therethrough.