Catheter-based fastener implantation methods
Methods implant one or more fastening structure(s) in a targeted body region, e.g., within a hollow body organ or an intraluminal space. The fastening structure(s) are implanted to a vessel wall, and serve to secure a prosthesis within the hollow body organ or intraluminal space.
1. A method for securing a prosthesis to tissue in a targeted tissue region comprising:
(i) providing at least one helical fastener including a sharpened distal body region configured for penetrating tissue in response to a rotational implantation force and a proximal body region having a diameter, a carrier on the proximal body region that extends completely across the diameter to limit penetration of the proximal body region into tissue, the carrier including an attachment element that, when the distal body region is in a tissue penetrating condition, is exposed outside tissue to mark a targeted prosthesis placement site in advance of deployment of a prosthesis;
(ii) providing a prosthesis including an attachment element configured, in response to manipulation of the prosthesis relative to the attachment element of the carrier, to mechanically engage the attachment element of the carrier;
(iii) introducing the at least one fastener into the targeted tissue region;
(iv) implanting the fastener in tissue in the targeted tissue region including coupling an actuator to the carrier for imparting the rotational implantation force to the fastener to place the distal body region in the tissue penetrating condition exposing the attachment element of the carrier outside tissue to mark the targeted prosthesis placement site;
(v) after (iii) and (iv), introducing the prosthesis into the targeted tissue region including introducing a prosthesis delivery catheter to deploy the prosthesis at the targeted prosthesis placement site marked by the attachment element of the carrier, and
(vii) manipulating the prosthesis to mechanically engage the attachment element of the prosthesis with the attachment element of the carrier to thereby couple the prosthesis to the fastener to secure the prosthesis to tissue at the targeted prosthesis placement site.
2. A method according to claim 1
wherein the attachment element of the carrier and the attachment element of prosthesis comprise a cooperating mechanical coupling assembly.
3. A method according to claim 2
wherein the mechanical coupling assembly includes a hook.
4. A method according to claim 2
wherein the cooperating mechanical coupling assembly includes a barb.
5. A method according to claim 1
wherein the cooperating attachment elements includes a magnetic coupling assembly.
6. A method according to claim 1
wherein the cooperating attachment elements includes a chemical coupling assembly.
7. A method according to claim 1
wherein the attachment element of the carrier includes a radio-opaque marker material to mark the targeted prosthesis placement site.