Implantable fasteners, applicators, and methods for brachytherapy

1. A fastener applicator comprising: a body portion including a handle assembly;

a cartridge assembly supported within the body portion, the cartridge assembly including implantable fasteners, at least one implantable fastener having:

a body including a backspan having a tissue facing surface;

a tissue penetrating portion extending from the body, the tissue penetrating portion including:

a first leg having first and second portions and a first connecting portion interconnecting the first and second portions, the first portion extending from a first end portion of the backspan and coupled to the second portion extending towards the backspan; and

a second leg having third and fourth portions and a second connecting portion interconnecting the third and fourth portions, the third portion extending from a second end portion of the backspan and coupled to the fourth portion, the first and third portions of the respective first and second legs extending away from the backspan at an angle such that the first and third portions of the respective first and second legs overlap one another, the backspan being spaced apart from the first and second connecting portions of the respective first and second legs in an unformed condition, and the backspan and the first and third portions of the respective first and second legs being parallel to each other in a formed condition; and

a capsule affixed to the tissue facing surface of the body, the capsule including radioactive material;

a drive assembly supported within the body portion and operatively coupled to the cartridge assembly to engage the implantable fasteners; and

an actuation assembly supported within the handle assembly and operatively coupled to the drive assembly to fire a distal-most implantable fastener upon actuation of the actuation assembly.

2. The fastener applicator according to claim 1 , wherein at least one of the implantable fasteners is a surgical staple and includes a radioactive material configured to provide a dose of radiation to a target surgical site.

3. The fastener applicator according to claim 2 , wherein the tissue facing surface defines a flattened surface extending along at least a portion thereof, the flattened surface providing an increased surface area for affixing the capsule onto the tissue facing surface of the backspan.

4. The fastener applicator according to claim 1 , wherein a radioactive material is dispersed throughout at least one of the implantable fasteners such that the entirety of the at least one of the implantable fasteners emits radiation.

5. The fastener applicator according to claim 1 , wherein the implantable fasteners include a first implantable fastener having sufficient mechanical strength to hold tissue together, and a second implantable fastener having the capsule affixed thereon for providing a dose of radiation to a target surgical site.

6. The fastener applicator according to claim 1 wherein at least a portion of the second portion of the first leg and at least a portion of the fourth portion of the second leg are radiused and in relative close approximation to one another in the formed condition of the at least one implantable fastener.

7. The fastener applicator according to claim 1 , wherein in the unformed condition, the backspan is distal of the first and second connecting portions of the first and second legs respectively.

8. A method of performing a surgical procedure at a surgical site, the method comprising:

positioning a fastener applicator within an opening in tissue, the fastener applicator loaded with implantable fasteners, each implantable fastener including:

a body including a backspan having a tissue facing surface;

a tissue penetrating portion extending from the body, the tissue penetrating portion including:

a first leg having first and second portions and a first connecting portion interconnecting the first and second portions, the first portion extending from a first end portion of the backspan and coupled to the second portion extending towards the backspan; and

a second leg having third and fourth portions and a second connecting portion interconnecting the third and fourth portions, the third portion extending from a second end portion of the backspan and coupled to the fourth portion, the first and third portions of the respective first and second legs extending away from the backspan at an angle such that the first and third portions of the respective first and second legs overlap one another, the backspan being spaced apart from the first and second connecting portions of the respective first and second legs in an unformed condition, and the backspan and the first and third portions of the respective first and second legs being parallel to each other in a formed condition; and

a capsule affixed to the tissue facing surface of the body, the capsule including radioactive material;

locating a first target of the surgical site; and

firing the fastener applicator to secure a first implantable fastener to the first target of the surgical site such that the capsule affixed thereon is in contact with tissue adjacent the first target of the surgical site.

9. The method according to claim 8 , further comprising:

locating a second target of the surgical site;

relocating the fastener applicator to the second target of the surgical site; and

firing the fastener applicator to secure a second implantable fastener to the second target such that the capsule affixed thereon is in contact with tissue adjacent the second target of the surgical site.

10. The method according to claim 9 , further comprising:

locating a plurality of targets of the surgical site;

relocating the fastener applicator to the plurality of targets of the surgical site; and

securing the implantable fasteners in any configuration, in any pattern, or in any quantity.