Patent ID: 7214177

Claim:
A culture/centrifugal tube that is used to hold a sample liquid and inserted into an accommodation space in an angle rotor of a centrifuge, the angle rotor rotating to subject the culture/centrifugal tube to centrifugal force, the culture/centrifugal tube comprising: a plastic vessel including: a base end that is closed; an open end that is open and opposite from the base end, the open end having an outer periphery and a rim, the outer periphery being formed with a spiral-shaped male screw and the rim defining an opening; and a side wall extending between the base end and the open end, the side wall and the base end defining an inside of the plastic vessel; and a plastic cap for covering the opening of the vessel, the cap including: a disk portion having an upper surface, a bottom surface and an outer peripheral surface, the bottom surface facing downward and having a perimeter, the outer peripheral surface extending upwardly from the perimeter of the bottom surface; and an annular portion connected to a portion of the outer peripheral surface of the disk portion and extending downward, the annular portion having an inner peripheral surface formed with a spiral-shaped female screw that engages with the male screw of the vessel to seal the inside of the vessel, an annular groove being defined between the annular portion and the outer peripheral surface of the disk portion, the annular groove extending downward and opening at a position level with the bottom surface of the disk portion, the open end of the vessel extending into the annular groove with the open end of the vessel in abutment against the disk portion when the male screw and the female screw are fully engaged, and wherein the upper surface is positioned at a level substantially the same as that of the rim of the open end of the vessel when the cap covers the open end.