Methods and devices for anchoring suture in bone
An elongate rigid suture anchor is provided which is driven and impacted directly into bone. It has two ends: a distal end, which forms a hole in the bone, and a proximal end that penetrates the sidewall of the bone hole as the anchor is displaced proximally in the hole. A proximal force is applied to the suture anchor to displace the anchor proximally and cause tilting of the anchor. As the anchor is displaced proximally, the proximal end of the anchor enters obliquely into the sidewall of the hole.
1. A suture anchor assembly, comprising:
a suture anchor having a proximal end, a proximal portion that includes the proximal end, a distal end that is shaped to penetrate bone and configured to penetrate the bone to form a hole from a surface of the bone to a desired depth, and a distal portion that includes the distal end and has a shoulder that defines a distal end of the proximal portion and a proximal end of the distal portion;
an introducer having a first end that engages with the shoulder during insertion of the suture anchor into the bone to transfer an insertion force to the suture anchor, and an interior portion in which the proximal portion of the suture anchor is entirely received while the first end is engaged with the shoulder; and
a suture securing section in the distal portion of the suture anchor by which a force is applied to the suture anchor to cause the suture anchor to be tilted within the hole,
wherein the proximal portion of the suture anchor has a bone engagement portion that penetrates a sidewall of the hole when the introducer is removed and the force is applied to the suture securing section to cause the suture anchor to be tilted within the hole.
2. The suture anchor assembly of claim 1 , wherein:
the suture anchor has a maximum outer transverse dimension at the distal portion and not at the proximal portion.
3. The suture anchor assembly of claim 2 , wherein the distal portion has an outer surface that forms the maximum outer transverse dimension of the suture anchor.
4. The suture anchor assembly of claim 2 , wherein the distal portion has a disc-shaped cross-section adjacent to the shoulder and having a diameter equal to the maximum transverse dimension of the distal portion.
5. The suture anchor assembly of claim 1 , wherein:
the proximal and distal portions of the suture anchor are formed integrally from a single piece of material.
6. The suture anchor assembly of claim 1 , wherein:
the suture anchor is formed so that all portions which engage bone are formed from the single piece of material.
7. The suture anchor assembly of claim 1 , wherein the proximal portion of the suture anchor has a suture channel.
8. The suture anchor assembly of claim 7 , wherein:
the suture channel is eccentrically positioned so that an eccentric force is applied to the suture securing section when suture positioned in the suture channel is tensioned.
9. The suture anchor assembly of claim 7 , wherein:
the suture channel includes a slot, the slot permitting suture to enter and leave the suture channel.
10. The suture anchor assembly of claim 1 , wherein the shoulder includes a keyed portion that is engaged with a corresponding portion on the introducer such that, when torque is applied to the introducer, the torque is transmitted to the suture anchor by way of the keyed portion to cause the distal portion to be driven into the bone while rotating.
11. The suture anchor assembly of claim 1 , wherein the distal portion includes beveled sides that converge to form a point at the distal end.
12. The suture anchor assembly of claim 1 , further comprising:
a suture attached to the suture securing section by which the force is applied to the suture securing section.
13. A suture anchor assembly, comprising:
a suture anchor having a distal end that has a shoulder and extends from the shoulder to a distal end of the suture anchor, and a proximal portion that extends from a proximal end of the suture anchor to the shoulder of the distal portion, wherein the distal end is shaped to penetrate bone and configured to penetrate the bone to form a hole from a surface of the bone to a desired depth;
an introducer having a first end that engages with the shoulder during insertion of the suture anchor into the bone to transfer an insertion force to the suture anchor, and an interior portion in which the proximal portion of the suture anchor is entirely received while the first end is engaged with the shoulder; and
a suture securing section in the distal portion of the suture anchor by which a force is applied to the suture anchor to cause the suture anchor to be tilted within the hole,
wherein the proximal portion of the suture anchor has a bone engagement portion that penetrates a sidewall of the hole when the introducer is removed and the force is applied to the suture securing section to cause the suture anchor to be tilted within the hole.