Anchor or staple with barbs
A tissue anchor includes an elongated body having a proximal end and a distal end, and a barb mounted to the elongated body adjacent the proximal end for movement between a retracted position and an extended position in which the barb projects outwardly from the elongated body. An anchoring system includes an implantable device with a tissue contacting surface facing in a proximal direction, the tissue anchor having its distal end engageable with the implantable device and its proximal end adapted to project proximally beyond the tissue contacting surface to grip a living tissue, and a second resilient element that is mounted between the distal end of the anchor and the implantable device, the second resilient element being adapted to bias the anchor distally relative to the implantable device. Tooling and methods of insertion and removal are provided.
1. A tissue anchor comprising:
an elongated body having a proximal end defining a tip, and a distal end;
a barb having a pivot end, the barb being mounted to the elongated body adjacent the proximal end for movement between a retracted position and an extended position in which the barb projects outwardly from the elongated body; and
a first resilient element disposed between the tip of the elongated body and the pivot end of the barb, the first resilient element including a compressed state when the barb is in the retracted position, the compressed state including the first resilient element being compressed toward the proximal end of the body from a first diameter to a second diameter smaller than the first diameter
wherein the barb is movable into the retracted position through the application of a force to the pivot end, thereby compressing the first resilient element, and
wherein the elongated body has a bore extending from the pivot end to an opening in the distal end, the bore being sized to receive a tool adapted to apply the force to the pivot end through the bore.
2. The tissue anchor of claim 1 , wherein the proximal end has a tissue penetrating tip.
3. The tissue anchor of claim 1 , wherein the elongated body has an opening adjacent the proximal end and a pivot end of the barb is pivotally mounted to the body within the opening.
4. The tissue anchor of claim 3 , wherein the entire barb is disposed through the opening and within the elongated body when in the retracted position.
5. The tissue anchor of claim 4 , wherein the first resilient element is connected between the elongated body and the barb to bias the barb toward the extended position.
6. The tissue anchor of claim 5 , wherein the first resilient element is housed within the elongated body proximal to the pivot end of the barb.
7. A method of anchoring an implantable device to a living tissue using the tissue anchor of claim 1 , comprising the steps of:
placing a proximal surface of the implantable device adjacent the living tissue;
driving the tip of the tissue anchor into the living tissue through an opening in the implantable device; and
moving the barb into the extended position so as to grip the living tissue and hold the proximal surface of the implantable device adjacent the living tissue.
8. The method of claim 7 , further comprising a step of compressing a second resilient element seated between a distal end of the tissue anchor and a surface of the implantable device as the barb is moved into the extended position.
9. The method of claim 8 , further comprising a step of decompressing the second resilient element so as to sink the barb into the living tissue.
10. A method of removing an implantable device and the tissue anchor of claim 1 from a living tissue, comprising the steps of:
holding the implantable device in a fixed position relative to the living tissue;
moving the barb into the retracted position; and
removing the tissue anchor and the device from the living tissue.