Pipette tip

Abstract

The present invention is to present a disposable pipette tip that can easily prevent a tight fit with another pipette tip without providing a separating mechanism in a supplying apparatus. The disposable pipette tip comprises: an attachment section for being attached to the dispensing device; and a liquid containing section for containing a liquid aspirated by the dispensing device, which is continually located to the attachment section, has a tapered distal end and comprises a tight fit preventing part which is located adjacent to the tapered distal end and prevents a tight fit with another pipette tip.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a frontal view of an embodiment of a pipette tip 1 of the present invention;

FIG. 2 is a top view of the pipette tip 1 shown in FIG. 1;

FIG. 3 is a view on the m-m cross section of the pipette tip 1 shown in FIG. 1;

FIG. 4 is a vertical section view showing overlapped two pipette tips;

FIG. 5 is a partial enlargement of the overlapped two pipette tips 1 shown in FIG. 4;

FIG. 6 is a perspective view of a pipette tip supplying apparatus for supplying the pipette tip 1;

FIG. 7 is a perspective view of a tip storage section 33 for storing the pipette tips 1;

FIG. 8 illustrates the condition when a pipette tip 1 is attached to a nozzle part 54a of the sample dispensing arm;

FIG. 9 illustrates the condition of a pipette tip 1 attached to a nozzle part 54a of the sample dispensing arm; and

FIGS. 10 and 11 are vertical cross section views of other embodiments of the pipette tip of the present invention.

Claims

1. A disposable pipette tip used in a dispensing device, comprising: an attachment section for being attached to the dispensing device; anda liquid containing section for containing a liquid aspirated by the dispensing device, which is continually located to the attachment section, has a tapered distal end and comprises a tight fit preventing part which is located adjacent to the tapered distal end and prevents a tight fit with another pipette tip.

2. The disposable pipette tip of claim 1, wherein the tight fit preventing part is provided on the external surface of the liquid containing section.

3. The disposable pipette tip of claim 1, wherein the tight fit preventing part comprises a stepped part having an external diameter that is larger than that of the liquid containing section on the tapered distal end side from the tight fit preventing part.

4. The disposable pipette tip of claim 1, wherein the tight fit preventing part comprises a projection which projects from the external surface of the liquid containing section.

5. The disposable pipette tip of claim 1, wherein the liquid containing section comprises a first part on the tapered distal end side and a second part on the attachment section side, the first part comprising the tight fit preventing part and being continually located to the second part,the second part has an internal diameter that decreases toward the first part,and the external diameter of the tight fit preventing part is larger than the internal diameter of the end of the second part on the first part side.

6. The disposable pipette tip of claim 5, wherein the liquid containing section comprises a third part being continually located to the attachment part and the second part.

7. The disposable pipette tip of claim 5, wherein the first part has an internal diameter that increases at a first rate from the tapered distal end toward the end of the first part on the second part side,and the second part has an internal diameter that increases at a second rate from the end of the first part on the second part side toward the attachment section, the second rate being greater than the first rate.

8. The disposable pipette tip of claim 5, wherein the inner surface of the first part is a smoothly continuous surface.

9. The disposable pipette tip of claim 1, wherein length of the first part is larger than that from the end of the second part on the first part side to the end of the attachment section on the opposite side of the second part.

10. A disposable pipette tip used in a dispensing device, comprising: an attachment section for being attached to the dispensing device; anda body being continually located to the attachment section,wherein the body comprises a tapered distal end part, a first part being continually located to the tapered distal end part, and a second part being continually located to the first part and having an internal diameter that decreases toward the first part,and wherein the external diameter of the end of the first part on the tapered distal end part side is larger than the internal diameter of the end of the second part on the first part side.

11. The disposable pipette tip of claim 10, wherein the body comprises a third part being continually located to the attachment section and the second part.

12. The disposable pipette tip of claim 10, wherein the first part is continually located to the tapered distal end part in step-like manner, such that the external diameter of the end of the first part on the tapered distal end side is larger than that of the end of the tapered distal end part on the first part side.

13. The disposable pipette tip of claim 10, wherein a projection is formed at the end of the first part on the tapered distal end part side, which projects from the external surface of the first part.

14. The disposable pipette tip of claim 10, wherein length from the distal end of the tapered distal end part to the end of the first part on the second part side is larger than that from the end of the second part on the first part side to the end of the attachment on the opposite side of the second part.

15. A disposable pipette tip used in a dispensing device, comprising: an attachment section for being attached to the dispensing device;a tapered part having a tapered shape; andan intermediate portion being continually located to the attachment section and the tapered part,wherein the tapered part comprises a tight fit preventing part which is located adjacent to the distal end of the tapered part and prevents a tight fit with another pipette tip.

16. The disposable pipette tip of claim 15, wherein the external diameter of the tight fit preventing part is larger than the internal diameter of the end of the tapered part on the intermediate portion side.

17. The disposable pipette tip of claim 15, wherein the tight fit preventing part comprises a stepped part having an external diameter that is larger than that of the tapered part on the distal end side from the tight fit preventing part.

18. The disposable pipette tip of claim 15, wherein the tight fit preventing part comprises a projection which projects from the external surface of the tapered part.

19. The disposable pipette tip of claim 15, wherein the intermediate portion comprises a first part on the tapered part side and a second part on the attachment section side,and the first part has an internal diameter that decreases toward the tapered part.

20. The disposable pipette tip of claim 19, wherein the tapered part has an internal diameter that increases at a first rate from the distal end toward the end of the tapered part on the intermediate portion side,and the first part has an internal diameter that increases at a second rate from the end of the tapered part on the first part side toward the second part, the second rate being greater than the first rate.