SYRINGE DEVICE AND SYRINGE PLUNGER

摘要

A syringe device includes a syringe body; a first space defined inside the syringe body; a plunger body being slidable inside the syringe body and varies the volume of the first space; a second space defined inside the plunger body; a plunger rod being slidable inside the plunger body and varies the volume of the second space; a coil spring that urges the plunger rod in a direction expanding the volume of the second space; a first communication passage and a second communication passage that communicate the first space with the second space; and a check valve member that forms an orifice that restricts the flow of a fluid between the first space and the second space in the first communication passage, and a check valve that allows only the flow of the fluid from the second space to the first space in the second communication passage.

主权项

1. A syringe device comprising:
a cylindrical syringe body having a nozzle at a distal end thereof; a first space of which a portion of a wall surface is defined inside the syringe body; a cylindrical plunger body that is configured so as to be slidable in an axial direction inside the syringe body and makes the volume of the first space variable; a second space of which a portion of a wall surface is defined inside the plunger body; a cylindrical plunger rod that is configured so as to be slidable in the axial direction inside the plunger body and makes the volume of the second space variable; an urging member that is provided between the plunger body and the plunger rod, and urges in a direction of expanding the volume of the second space; a first communication passage and a second communication passage that allow the first space and the second space to communicate with each other; an orifice that is provided in the first communication passage and restricts the flow of a fluid between the first space and the second space; and a check valve that is provided in the second communication passage, allows the flow of the fluid from the second space to the first space, and restricts the flow of the fluid from the first space to the second space.