Tissue fastening tool, stent, applicator for placing the same, and tissue fastening method through natural orifice
View Patent ↗A tissue fastening tool which fastens a first biological tissue and a second biological tissue adjacent to the first biological tissue, includes a first tissue fixing section which is hooked onto the first biological tissue and the second tissue fixing section which is hooked onto a second biological tissue adjacent to the first biological tissue.
1. A tissue fastening tool which fastens a first biological tissue and a second biological tissue adjacent to the first biological tissue, comprising:
an elastic wire which has a predetermined length to be indwelled to the first biological tissue and second biological tissue by piercing, and which is configured to be restored to a predetermined coiled shape, wherein
the wire includes:
a first wire and a second wire;
a first tissue fixing section which is disposed on a first end of the first wire and which is configured to be hooked onto the first biological tissue;
a second tissue fixing section which is disposed on a second end of the first wire and which is configured to be hooked onto the second biological tissue; and
an anchor which is formed of the second wire different from the first wire and which is secured to the first wire between the first tissue fixing section and the second tissue fixing section, a first end of the anchor is fixed to the first wire and a second end of the anchor is configured to be restored so as to form a loop, and wherein
the first wire including the first tissue fixing section and the second tissue fixing section is configured to be restored to a predetermined coiled shape wound with a predetermined diameter, and
when the second wire is restored, the anchor is formed in the loop such that the anchor has a central axis disposed outside of the predetermined diameter of the first tissue fixing section and the second tissue fixing section.
2. The tissue fastening tool according to claim 1 , wherein
the anchor is formed of a coil shape which is wound into a direction opposite from a winding direction of the first tissue fixing section and the second tissue fixing section.
3. The tissue fastening tool according to claim 1 , wherein
the anchor is a projection formed by bending the second wire in a winding direction opposite from the first tissue fixing section and the second tissue fixing section.
4. The tissue fastening tool according to claim 1 , wherein the central axis of the anchor and a center axis of the predetermined coiled shape of the first wire are set to be parallel to each other.
5. An applicator comprising:
a tubular puncturing tool housing the tissue fastening tool according to claim 1 ;
a fastening tool pusher which is inserted into the puncturing tool and dispenses the tissue fastening tool inserted into the puncturing tool from a distal end of the puncturing tool; and
a sheath in which the puncturing tool is inserted, the sheath configured to shift a stent attached at the distal end of the sheath relative to the puncturing tool.
6. The applicator according to claim 5 , further comprising:
a fastening tool pusher operating section which shifts the fastening tool pusher relative to the puncturing tool.
7. The applicator according to claim 6 , wherein
the fastening tool pusher operating section comprises:
a lever swingably disposed on a member which supports the puncturing tool; and
a linkage which translates an swinging motion of the lever into a linear motion of the fastening tool pusher along the puncturing tool.
8. The applicator according to claim 7 , wherein a moving distance of the fastening tool pusher per operation on the lever is substantially n or 1/n times (n is a positive integer) the circumference of the tissue fastening tool when the tissue fastening tool forms into a coil shape.
9. The applicator according to claim 6 , wherein
the puncturing tool pusher operating section comprises:
a grip rotatably disposed at the applicator main body; and
a linkage which translates rotation motion of the grip into a liner motion of the tissue fastening tool along the puncturing tool.
10. The applicator according to claim 9 , wherein a moving distance of the fastening tool pusher per 360-degree roll of the grip is substantially n or 1/n times (n is a positive integer) the circumference of the tissue fastening tool when the tissue fastening tool forms into a coil shape.
11. The applicator according to claim 5 , wherein a mounting section which allows the stent detachably attach to a distal end of the sheath is disposed at the distal end of the sheath.
12. The applicator according to claim 5 , further comprising:
a stent pusher for separating the stent attached to a distal end of the sheath from the sheath.
13. The applicator according to claim 5 , wherein a distal end surface of the fastening tool pusher is formed in a smooth manner.
14. The applicator according to claim 13 , wherein a front portion of the fastening tool pusher including the distal end surface is formed in a flexible manner.
15. A tissue fastening apparatus comprising:
the tissue fastening tool according to claim 1 ;
a stent provided with a dilating portion having a diameter which increases from a front end to a rear end of the dilating portion, an indwelled portion which is connected the dilating portion, and a through hole which passes through the dilating portion and the indwelled portion in a longitudinal direction of the stent; and
an applicator provided with a tubular puncturing tool in which the tissue fastening tool is inserted, a fastening tool pusher inserted into the puncturing tool to dispense the tissue fastening tool inserted into the puncturing tool from a distal end of the puncturing tool, and a sheath into which the puncturing tool is inserted, the sheath configured to shift the stent which is detachably disposed at the distal end of the sheath relative to the puncturing tool.