Connector

1. A connector that can be connected to a first container and a second container to transfer a liquid between the first container and the second container, the connector comprising:

a connector main body provided with a tubular portion and a stopcock fitted in the tubular portion so as to be rotatable around an axis of the tubular portion, one end of the tubular portion being sealed with the stopcock fitted in the tubular portion, an open portion being formed at the other end of the tubular portion, a first hole, a second hole, a third hole, and a fourth hole being formed in the connector main body;

a first connecting portion that is engageable with the first container;

a second connecting portion that is engageable with the second container;

a first flow channel formed in the stopcock that passes through the stopcock in a radial direction, and

a second flow channel formed in the stopcock that brings an opening formed on the open portion side into communication with an opening formed in a side face of the stopcock,

wherein the second connecting portion is integrally provided with an engagement portion that is engageable with the second container and a needle-like portion for piercing into the second container, and

wherein the connector is configured to switch between a first setting that brings the first hole into communication with the second flow channel in the stopcock and brings the third hole into communication with the fourth hole via the first flow channel and a second setting that brings the second hole into communication with the second flow channel in the stopcock and brings the third hole into communication with the fourth hole via the first flow channel by rotating the stopcock.

2. The connector according to claim 1 ,

wherein the first connecting portion comprises a releasing mechanism for releasing engagement with the first container, and

the second connecting portion does not comprise a lever releasing mechanism for releasing engagement with the second container.

3. The connector according to claim 1 ,

wherein the engagement portion of the second connecting portion is a hollow cylindrical connecting port that is engageable with a mouth portion of the second container, and

the connecting port has a protrusion protruding from an inner circumferential surface of the connecting port.

4. The connector according to claim 3 , wherein the connecting port has a slit that is cut in a side face of the connecting port.

5. The connector according to claim 1 ,

wherein the first connecting portion is integrally provided with a lever lock having a claw portion that is engageable with a portion of the first container,

the lever lock doubles as a releasing mechanism for releasing engagement with the first container, and

engagement of the lever lock with the first container is released by bending the lever lock.

6. The connector according to claim 1 ,

wherein the first connecting portion is a rotary lock,

the rotary lock has a recessed groove that is engageable with a projection formed on the first container,

the rotary lock doubles as a releasing mechanism for releasing engagement with the first container, and

engagement between the projection and the recessed groove is released by rotating the rotary lock around an axis thereof.

7. The connector according to claim 1 , further comprising a syringe that comprises a cylinder and a movable piston,

wherein a liquid is transferred between the first container and the second container by ejecting and drawing in air by moving the piston.

8. The connector according to claim 7 , further comprising a hydrophobic filter, wherein air is ejected and drawn in through the hydrophobic filter.

9. The connector according to claim 1 , further comprising a dropper that can expand and contract,

wherein a liquid is transferred between the first container and the second container by ejecting and drawing in air by expanding and contracting the dropper.

10. The connector according to claim 9 , further comprising a hydrophobic filter,

wherein air is ejected and drawn in through the hydrophobic filter.

11. The connector according to claim 1 , wherein the first connecting portion has a portion covered with a shield, wherein the shield can open and close by extension and retraction.

12. The connector according to claim 1 ,

wherein the first connecting portion and the second connecting portion are provided in the connector main body,

connecting ports are formed in the first and the second connecting portions,

the first and the third holes are in communication with a space in the first connecting portion, and

the second and the fourth holes are in communication with a space on a connecting port side of the second connecting portion.

13. The connector according to claim 12 , wherein the first connecting portion comprises a lever lock that is integral with the connecting port formed in the first connecting portion.

14. The connector according to claim 12 , wherein the second connecting portion has a protrusion protruding from an inner circumferential surface of the connecting port formed in the second connecting portion.

15. The connector according to claim 12 , wherein the first connecting portion has a portion covered with a shield, wherein the shield can open and close by extension and retraction.

16. The connector according to claim 1 , wherein a graduated syringe comprising a cylinder and a movable piston is integrally formed on the other end side of the tubular portion.

17. The connector according to claim 1 ,

wherein a lever extended from the stopcock is formed on the stopcock, and

the lever is disposed in such a manner that:

when the stopcock is set to the first setting that brings the first hole into communication with the second flow channel in the stopcock, a leading end of the extended lever points to an external space side communicating with the first hole, and

when the stopcock is set to the second setting that brings the second hole into communication with the second flow channel in the stopcock, the leading end of the extended lever points to an external space side communicating with the second hole.

18. The connector according to claim 1 , wherein a hydrophobic filter is provided in at least one of the third hole, the penetrating flow channel, and the fourth hole.