Suction device, suction system, and suction method

1. A suction device, comprising:

an outer tube including a base-end side and an opening edge section, the outer tube being connected to a fluid supply unit on the base-end side of the outer tube;

a suction tube provided in the outer tube and including a base-end side and an opening edge section, the suction tube being connected to a negative pressure generating unit on the base-end side of the suction tube,

wherein an annular fluid supply passage, configured to supply fluid from a distal end thereof, is formed between an inner peripheral surface of the outer tube and an outer peripheral surface of the suction tube, and

the opening edge section of the suction tube is placed inside the opening edge section of the outer tube toward the base-end side thereof; and

an adapter connected to the base-end side of the outer tube and the base-end side of the suction tube, the adapter having a fluid supply port that connects the outer tube to the fluid supply unit and a suction port that connects the suction tube to the negative pressure generating unit,

wherein the annular fluid supply passage is configured to allow the fluid to exit the distal end thereof in a direction along a longitudinal axis of the outer tube, and

the opening edge section of the suction tube is spaced from the opening edge section of the outer tube to define an annular fluid exit at the distal end of the annular fluid supply passage.

2. The suction device according to claim 1 , wherein the fluid is water.

3. The suction device according to claim 1 , wherein the negative pressure generating unit is a suction device for medical use.

4. The suction device according to claim 3 , wherein the suction device for medical use is a suction device for otorhinolaryngology.

5. A suction device, comprising:

a suction tube having a suction passage connected to a negative pressure generating unit on a base-end side thereof;

an outer tube having a fluid supply passage, configured to supply fluid from a distal end thereof, formed in an annular shape at an outer periphery of the suction passage and connected to a fluid supply unit on a base-end side thereof, an opening edge section of the suction tube being spaced from an opening edge section of the outer tube, to define an annular fluid exit at the distal end of the annular fluid supply passage,

wherein the suction device is adapted to suck a fluid supplied from the fluid supply passage into the suction passage, such that the fluid is sucked in the form of thin layer over the entire inner peripheral surface of the suction passage, when an object to be sucked; and

an adapter connected to the fluid supply passage and the suction passage, the adapter having a fluid supply port that connects the fluid supply passage to the fluid supply unit and a suction port that connects the suction passage to the negative pressure generating unit.

6. The suction device according to claim 5 , wherein the fluid is water.

7. The suction device according to claim 5 , wherein the negative pressure generating unit is a suction device for medical use.

8. The suction device according to claim 7 , wherein the suction device for medical use is a suction device for otorhinolaryngology.

9. The suction device according to claim 5 , wherein the annular fluid supply passage is configured to allow the fluid to exit the distal end thereof in a direction along a longitudinal axis of the outer tube.