Mini-pipette
The present invention relates to a mini-pipette, and more particularly, to a mini-pipette which has capacity varying means that can vary the movement distance of a push button reciprocating in the outer body to generate suction force so that a variety of samples can be easily collected. The present invention provides a mini-pipette comprising: an outer body having a hollow movement space and a suction passage formed at a lower part of the outer body; a push button for generating negative or positive pressure in the suction passage while reciprocating in the movement space of the outer body; elastic means for elastically supporting the push button in the movement space; and a capacity varying means formed inside the outer body, for varying a movement distance of the push button in the movement space.
1 . A mini-pipette comprising:
an outer body having a hollow movement space and a suction passage formed at a lower part of the outer body;
a push button for generating negative or positive pressure in the suction passage while reciprocating in the movement space of the outer body;
elastic means for elastically supporting the push button in the movement space; and
a capacity varying means formed inside the outer body, for varying a movement distance of the push button in the movement space,
wherein the capacity varying means comprises at least one interference protrusion aligned in a height direction and protruding from an inner circumferential surface of the outer body toward the movement space, and
wherein the push button comprises an inner body having a non-circular cross-section with a first plane length that is greater than a distance between the interference protrusions and a second plane length that is smaller than the distance between the interference protrusions, such that rotation of the push button selectively engages or disengages the inner body with the interference protrusions to provide discrete volumetric settings for precise micro-volume liquid handling.
2 . The mini-pipette of claim 1 , wherein the inner body further comprises:
a press part formed extending outwardly from one end of the inner body, having an outer diameter smaller than the outer diameter of the inner body, and exposed outside the outer body; and
a guide part extending outwardly from the other end of the inner body and guided along the suction passage,
wherein an upper inner step formed due to the diameter difference between the inner body and the press part is selectively caught in the interference protrusion depending on a rotational position of the push button to limit the movement distance of the push button.
3 . The mini-pipette of claim 1 , wherein the outer body is divided into a lower outer body having the suction passage and an upper outer body having an entrance through which a part of the push button enters and exits,
wherein the interference protrusion is formed at the upper outer body.
4 . The mini-pipette of claim 3 , wherein the upper outer body is rotated based on the lower outer body to change an alignment between the interference protrusion and the non-circular cross-section of the inner body.
5 . The mini-pipette of claim 1 , wherein the non-circular cross-section is rectangular or oval-shaped, and the first plane length and second plane length correspond to different dimensions of the non-circular cross-section.