Piston for material delivery system

摘要

A piston configured to be received within a syringe is disclosed. The piston includes a valve body defining a proximal end and a distal end, a filter disposed within the proximal end of the valve body, and a valve disk disposed within the distal end of the valve body. As the piston is advanced through the syringe, the valve disk is configured to provide fluid flow through the valve body.

主权项

1. A piston configured to be received within a syringe comprising:
a valve body defining a proximal end and a distal end, the proximal end comprising a filter hub and a filter base having a filter disposed therein configured to trap noxious vapors such that the vapors are contained within the filter and the valve body of the piston to prevent release into the environment; a valve disk disposed within the distal end of the valve body, wherein as the piston is advanced through the syringe, the valve disk is configured to provide fluid flow through the valve body; and a stem including an outer shaft that is fixed to the filter hub and an inner shaft that is fixed to the valve disk such that the outer shaft is spaced apart from the valve disk and the filter, wherein as the piston is advanced through the syringe, the valve disk is configured to move between a first position and a second position, wherein in the first position the valve disk is open to fluid flow and in the second position the valve disk is closed to fluid flow so as to contain the noxious vapors within a sealed valve body of the piston and prevent the noxious vapors from being dispelled through a needle hilt of the syringe.