| 摘要 |
An apparatus is comprised of an applicator for selectively applying a hydrostatic force on a work material contained within the applicator, a tip coupled to the applicator for conducting the work material to a distal end of the tip, and a one-way, pressure-controlled valve defined into the distal end of the tip to selectively open the valve upon application of pressure on the work material supplied to the tip from the applicator and to selectively close the valve and prevent withdrawal or pull back of the work material back into the tip when the pressure on the work material supplied to the tip from the applicator falls below a predetermined value.
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