SYRINGE AND METHOD FOR DOSED DISPENSING OF MATERIALS
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United States of America Patent
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app pub date -
Sep 13, 2012
filing date -
Jul 20, 2007
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Abandoned
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Abstract
A syringe for dosed dispensing of material, in particular of free-flowing and/or pasty dental material, includes a sleeve for accommodating material and a piston inserted into the sleeve defining an inner sleeve chamber and which has a piston member, a frictional engagement element which abuts an inner wall of the sleeve, and an elastic element coupling the frictional engagement element and the piston member, wherein the elastic element can be tensioned, on insertion of the piston and/or of the piston member into the sleeve, by means of a relative lag of the frictional engagement element in relation to the piston member, wherein by relaxing the elastic element it is possible for the piston member to be expelled at least partially from the sleeve while the frictional engagement element remains motionless, to increase the volume of the inner sleeve chamber.
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