US PATENT SUBCLASS 604 / 38
.~.~.~ 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}
27  DF  .~ Material introduced into and removed from body through passage in body inserted means {7}
36  DF  .~.~ Means moved by person to introduce and remove material {2}
38.~.~.~ Piston

DEFINITION

Classification: 604/38

Piston:

(under subclass 36) Subject matter wherein the means is a ram or plunger which is reciprocated back and forth to alternately force in and withdraw the body treating material to and from the body.

(1) Note. Blood "telltale" syringes are not classifiable herein since the withdrawal of material (blood) in that instance is merely for testing for the presence of said material and not for the purpose of removing it, per se.

SEE OR SEARCH THIS CLASS, SUBCLASS:

218+, and 900, for piston structure of hand held injectors, including those having blood "telltale" aspirating means.