82 and the inner surface of the distal end portion 9. Therefore, it is possible to prevent the biological tissue that has entered the inside of the conduit electrode 7 from the opening OP from adhering to the inner surface of the conduit electrode 7.

OTHER EMBODIMENTS

The embodiment for carrying out the disclosure has been described; however, the disclosure is not limited to the embodiment stated above.

Any of Modified Examples 1 to 13, as respectively illustrated in FIGS. 6 to 18, may be adopted in the embodiment stated above.

Modified Example 1

FIG. 6 is a view illustrating Modified Example 1 of the embodiment. In particular, FIG. 6 is a diagram corresponding to FIG. 4.

A treatment tool 1A (conduit electrode 7A) according to Modified Example 1, as illustrated in FIG. 6, has a permeation site 10 provided in the tubular portion 8. The permeation site 10 has a mesh shape that communicates the inside and outside of the tubular portion 8, and is provided over the entire circumference in a circumferential direction about the central axis Ax. When the hemostasis initiating operation is performed, water is dripped little by little between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site by passing through the permeation site 10. Consequently, it is possible to sufficiently suppress adhesion of the biological tissue to the first hemostatic surface 91 or the second hemostatic surface 92.

The permeation site 10 may be provided in the sheath 6 instead of the conduit electrode 7A.

Modified Example 2

FIG. 7 is a view illustrating Modified Example 2 of the embodiment. In particular, FIG. 7 is a diagram corresponding to FIG. 5. The coating layer CO is omitted in FIG. 7 for convenience of description.

A treatment tool 1B (conduit electrode 7B) according to Modified Example 2, as illustrated in FIG. 7, has a through hole 83 to prevent a biological tissue LT from being adhered to the tubular portion 8. The through hole 83 is a hole penetrating the inside and outside of the tubular portion 8, and is provided at a position where the first and second hemostatic surfaces 91 and 92 are extended to the proximal end side Ar2 along the central axis Ax. When the hemostasis initiating operation is performed, water is dripped little by little between the first hemostatic surface 91 or the second hemostatic surface 92 and the biological tissue LT (hemostasis target site) by passing through the through hole 83. Consequently, it is possible to sufficiently suppress adhesion of the biological tissue LT to the first hemostatic surface 91 or the second hemostatic surface 92.

Modified Example 3

FIG. 8 is a view illustrating Modified Example 3 of the embodiment. In particular, FIG. 8 is a diagram corresponding to FIG. 3.

A treatment tool 1C (conduit electrode 7C) according to Modified Example 3, as illustrated in FIG. 8, has a groove portion 84 provided on an outer surface of the tubular portion 8. The groove portion 84 is connected to the first hemostatic surface 91, and linearly extends from a position connected to the first hemostatic surface 91 to the proximal end of the conduit electrode 7C along the central axis Ax. Although not specifically illustrated, the outer surface of the sheath 6 is also provided with a groove portion communicating with the groove portion 84 and extending from the distal end to the proximal end of the sheath 6. An opening of the groove portion 84 and an opening of the groove portion (not illustrated) of the sheath 6 are closed by the tube 11. When the hemostasis initiating operation is performed, water is dripped little by little between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site by passing through the groove portion (not illustrated) of the sheath 6 and the groove portion 84. Consequently, it is possible to sufficiently suppress adhesion of the biological tissue to the first hemostatic surface 91 or the second hemostatic surface 92. Since a line, i.e. the groove portion (not illustrated) of the sheath 6 and the groove portion 84, through which water is dripped is provided separately from a line, e.g. first and second conduits PA1 and PA2, through which water is supplied and sucked, the line through which water is dripped is not emptied by suction; water can be always filled. Therefore, it is possible to promptly drip water between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site.

Modified Example 4

FIG. 9 is a view illustrating Modified Example 4 of the embodiment. In particular, FIG. 9 is a diagram corresponding to FIG. 5. The coating layer CO is omitted in FIG. 9 for convenience of description.

A treatment tool 1D according to Modified Example 4, as illustrated in FIG. 9, has a second tubular sheath 6D provided to cover the sheath 6 and the tubular portion 8. Consequently, a third conduit PA3 is provided between an inner surface of the second sheath 6D, and the outer surface of the sheath 6 and the outer surface of the tubular portion 8. When the hemostasis initiating operation is performed, water is dripped little by little between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site by passing through the third conduit PA3. Consequently, it is possible to sufficiently suppress adhesion of the biological tissue to the first hemostatic surface 91 or the second hemostatic surface 92.

Modified Example 5

FIG. 10 is a view illustrating Modified Example 5 of the embodiment. In particular, FIG. 10 is a diagram corresponding to FIG. 5. The coating layer CO is omitted in FIG. 10 for convenience of description.

A treatment tool 1E (conduit electrode 7E) according to Modified Example 5, has a sponge ring 12 provided with respect to the conduit electrode 7B (FIG. 7) according to Modified Example 2 stated above. The sponge ring 12 is formed of a porous member capable of holding liquid, has an annular shape about the central axis Ax, and is attached to the outer surface of the tubular portion 8 so as to close the through hole 83. Water discharged to the outside via the through hole 83 in response to the water supply operation or the hemostasis initiating operation is held by the sponge ring 12. The water held by the sponge ring 12 is dripped little by little between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site by sandwiching the sponge ring 12 between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site when the operator attempts to stop bleeding at the hemostasis target site. Consequently, it is possible to sufficiently suppress adhesion of the biological tissue to the first hemostatic surface 91 or the second hemostatic surface 92. It is possible to promptly drip water between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site.

In Modified Examples 1 to 5 stated above, a structure for suppressing adhesion of the biological tissue to the first hemostatic surface 91 or the second hemostatic surface 92 has been described, but such a structure is not limited thereto.

For example, in the embodiment as stated above, water may be stored on a back surface of the first hemostatic surface 91 in the distal end portion 9 while the first hemostatic surface 91 faces downward, and such water may be dripped to the hemostasis target site when the operator attempts to stop bleeding at the hemostasis target site. In this way, similarly to Modified Example 5 stated above, it is possible to promptly drip water between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site.

For example, the first hemostatic surface 91 and the second hemostatic surface 92 may be made of carbon which is a material to which the biological tissue is hardly adhered.

Furthermore, for example, the first hemostatic surface 91 and the second hemostatic surface 92 may have an uneven shape to which the biological tissue is hardly adhered.

For example, the first hemostatic surface 91 may be configured to have a curved surface to which the biological tissue is hardly adhered.

In a case where there is no water between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site, the biological tissue is easily adhered to the first hemostatic surface 91 or the second hemostatic surface 92. Therefore, a structure may be adopted in which a sensor for detecting water is provided, and the high-frequency current flows to the hemostasis target site only when the water is detected.

In Modified Example 5 stated above, an osmosis membrane may be adopted instead of the sponge ring 12. Water discharged to the outside via the through hole 83 in response to the water supply operation or the hemostasis initiating operation is held by the osmosis membrane. When the operator attempts to stop bleeding at the hemostasis target site, the osmosis membrane is brought into contact with blood or the like to drip the held water little by little between the first hemostatic surface 91 or the second hemostatic surface 92 and the hemostasis target site.

Modified Example 6

FIG. 11 is a view illustrating Modified Example 6 of the embodiment. In particular, FIG. 11 is a diagram corresponding to FIG. 5. The coating layer CO is omitted in FIG. 11 for convenience of description.

A treatment tool 1F according to Modified Example 6, as illustrated in FIG. 11, has a second tubular sheath 6F provided to cover the sheath 6 and the tubular portion 8. In the second sheath 6F, a plurality of brush bristles 61 are implanted on the distal end side Ar1 of the inner surface. Further, the second sheath 6F is provided to be movable forward and backward along the central axis Ax with respect to the sheath 6 and the tubular portion 8. When the biological tissue LT′ adheres to the first hemostatic surface 91 or the second hemostatic surface 92, the second sheath 6F is moved forward and backward. Consequently, the biological tissue LT′ is peeled off from the first hemostatic surface 91 or the second hemostatic surface 92 by the brush bristles 61.

A structure in which the plurality of brush bristles 61 are omitted may be adopted. In this case, the biological tissue LT′ is peeled off from the first hemostatic surface 91 or the second hemostatic surface 92 by the second sheath 6F itself. Additionally, the second sheath 6F may be configured to be movable forward and backward along the central axis Ax, or be rotatable along a circumferential direction about the central axis Ax.

In Modified Example 6 stated above, a structure for peeling off the adhered biological tissue LT′ from the first hemostatic surface 91 or the second hemostatic surface 92 has been described, but such a structure is not limited thereto.

For example, a device such as another treatment tool may be provided with a site having large friction, and the biological tissue LT′ may be peeled off by rubbing the first hemostatic surface 91 or the second hemostatic surface 92 against the site.

Furthermore, for example, the biological tissue LT′ may be peeled off by ejecting water having a high flow rate from the through hole 83 toward the first hemostatic surface 91 or the second hemostatic surface 92 while the opening OP is blocked by another member (e.g. the biological tissue or the like) in Modified Example 2 stated above.

Furthermore, for example, the biological tissue LT′ may be peeled off by ejecting water having a high flow rate from the third conduit PA3 toward the first hemostatic surface 91 or the second hemostatic surface 92 in Modified Example 4.

Modified Example 7

FIG. 12 is a view illustrating Modified Example 7 of the embodiment. In particular, FIG. 12 is a diagram corresponding to FIG. 3.

A treatment tool 1G (conduit electrode 7G) according to Modified Example 7, as illustrated in FIG. 12, has an insulation member 911 provided at a part of the first hemostatic surface 91. The insulation member 911 is made of the same material as the coating layer CO. That is, an area where the biological tissue adheres to the first hemostatic surface 91 is reduced by providing the insulation member 911 at a part of the first hemostatic surface 91, and thus the biological tissue adhering to the first hemostatic surface 91 can be easily peeled off.

In FIG. 12, the insulation member 911 is provided on the first hemostatic surface 91 only, but the disclosure is not limited thereto; the insulation member 911 may also be provided at a part of the second hemostatic surface 92.