Pipet device with disposable tip

• US 20030177849A1
• Filed: 02/18/2003
• Published: 09/25/2003
• Est. Priority Date: 08/18/2000
• Status: Active Grant

• Current Assignee: ARKRAY, Inc
• Original Assignee: ARKRAY, Inc
• Inventors: Matsuda, Takeski, Kitamura, Shigeru
• Granted Patent: US 6,874,379 B2
• Time in Patent Office: Days
• US Class Current: 73/864.14
• CPC Class Codes: B01L 2200/0684 Venting, avoiding backpressure, avoid gas bubbles
• CPC Class Codes: B01L 3/0279 co-operating with positive ejection means
• CPC Class Codes: G01N 2035/103 using disposable tips

Abstract

A pipet device (A) includes a pipet nozzle (1) formed with an internal passage (10) and a hollow pipet tip (4) removably attached to the nozzle (1). The tip (4) is movable between a normal fixed position and a completely detached position relative to the nozzle (1). The nozzle (1) is formed with an external-air intake groove (16). The intake groove (16) is closed by the tip (4) when the tip (4) is at the normal fixed position. The intake groove (16) is exposed from the tip (4) when the tip (4) is moved from the normal fixed position toward the completely detached position.

Claims

1. A pipet device comprising:

a pipet nozzle formed with an internal passage; and

a hollow pipet tip which is removably attached to the nozzle and which is movable between a normal fixed position and a completely detached position relative to the nozzle;

the nozzle being formed with an external-air intake, the intake being closed by the tip when the tip is at the normal fixed position, the intake being exposed beyond the tip when the tip is moved from the normal fixed position toward the completely detached position.

2. The pipet device according to claim 1, wherein the nozzle is elongated along an axis, the intake including a groove extending along the axis.

3. The pipet device according to claim 1, wherein the intake comprises a through-hole communicating with the internal passage of the nozzle.

4. The pipet device according to claim 1, further comprising an O-ring, the nozzle being formed with an annular groove for receiving the O-ring.

5. The pipet device according to claim 4, wherein the tip is formed with a fixing groove for engagement with the O-ring.

6. The pipet device according to claim 4, wherein the nozzle includes a lower end for fitting in the tip, the intake being provided between the annular groove and the lower end.