Infusion pump

1. An infusion pump comprising:

a tube attachment section configured such that an infusion tube is detachably attachable to the tube attachment section;

an access cover configured to close the tube attachment section in an openable manner;

a tube clamp mechanism located within the tube attachment section and configured to clamp and block a portion of the infusion tube, the tube clamp mechanism comprising:

a base member,

a clip clamp member rotatably mounted on the base member,

a tube clamp release lever rotatably mounted on the base member, and

a tube clamp member rotatably mounted on the base member; and

an engagement section configured to engage the tube clamp member with the clip clamp member,

wherein the clip clamp member is configured to reversibly clamp a clip member that is attachable to a portion of the infusion tube, such that when the access cover is open and the clip member is present, the clip clamp member clamps the clip member and thereby forms a blocking portion at a location along the infusion tube, and such that when the access cover is closed and the clip member is present, the clip clamp member releases the clip member and thereby eliminates the blocking portion,

wherein the tube clamp release lever is configured to push the tube clamp member in a direction away from the infusion tube when the tube clamp release lever is pushed by a user, and

wherein the engagement section, the tube clamp member, and the clip clamp member are configured such that, when the access cover changes from an open position to a closed position, the engagement section engages the tube clamp member with the clip clamp member such that the tube clamp member and the clip clamp member are integrally rotated.

2. The infusion pump according to claim 1 , wherein the tube clamp member is configured to clamp a portion of the infusion tube and form a second blocking portion when the clip member is not present and the access cover is open, and to separate from the infusion tube and eliminate the second blocking portion when the access cover is closed.

3. The infusion pump according to claim 1 , wherein the engagement section, the tube clamp member, and the clip clamp member are configured such that, when the access cover changes from the closed position to the open position, the engagement section disengages the tube clamp member from the clip clamp member.

4. The infusion pump according to claim 1 , further comprising a first spring configured to bias the tube clamp member to clamp the infusion tube.

5. The infusion pump according to claim 4 , further comprising a second spring attached at a first end to the tube clamp release lever and at a second end to the base member.

6. The infusion pump according to claim 5 , wherein a spring constant of the second spring is 3 to 8 percent of a spring constant of the first spring.

7. The infusion pump according to claim 1 , further comprising a display unit disposed on an upper portion of the infusion pump and configured to display information.

8. The infusion pump according to claim 1 , further comprising an operation panel provided with operating buttons disposed on an upper portion of the infusion pump.

9. The infusion pump according to claim 1 , wherein the tube attachment section and the access cover are disposed on a lower portion of the infusion pump.

10. The infusion pump according to claim 1 , further comprising the clip member.

11. The infusion pump according to claim 1 , further comprising a liquid feed driving unit.

12. The infusion pump according to claim 11 , further comprising an infusion tube pressing member disposed on the access cover.

13. The infusion pump according to claim 1 , wherein the infusion pump is configured to have the infusion tube attached to be held in a horizontal orientation.

14. The infusion pump according to claim 1 , further comprising a bubble sensor, an upstream block sensor, and a downstream block sensor disposed in the tube attachment section.

15. The infusion pump according to claim 1 , wherein the tube clamp member, the tube clamp release lever, and the clip clamp member are made of plastic material.

16. An infusion pump comprising:

a tube attachment section configured such that an infusion tube is detachably attachable to the tube attachment section;

an access cover configured to close the tube attachment section in an openable manner; and

a tube clamp mechanism located within the tube attachment section and configured to clamp and block a portion of the infusion tube,

the tube clamp mechanism comprising:

a base member;

a clip clamp member rotatably mounted on the base member;

a tube clamp release lever rotatably mounted on the base member; and

a tube clamp member rotatably mounted on the base member, wherein the clip clamp member is configured to reversibly clamp a clip member that is attachable to a portion of the infusion tube, such that when the access cover is open and the clip member is present, the clip clamp member clamps the clip member and thereby forms a blocking portion at a location along the infusion tube, and such that when the access cover is closed and the clip member is present, the clip clamp member releases the clip member and thereby eliminates the blocking portion, and wherein the tube clamp release lever is configured to push the tube clamp member in a direction away from the infusion tube when the tube clamp release lever is pushed by a user;

the infusion pump further comprising an engagement section configured to engage the tube clamp member with the clip clamp member so as to be integrally rotated in a case of operating in a direction toward the infusion tube, and disengage the tube clamp member from the clip clamp member to release the clip clamp member from restriction of the tube clamp member in a case of operating in a direction away from the infusion tube.