High tension suture anchor
The present invention describes a bio-medically compatible gripping device capable of radial collapse in accordance with the shrinkage of a nylon or other polymeric material cored surgical cable undergoing tension while maintaining a firm grip for prolonged periods of time. It provides a gripping device capable of maintaining a non-damaging hold on the outer surface of a slippery delicate cable under high tension for a sufficient time in which the healing process can occur.
1. A suture anchor comprising:
a body having a longitudinal axis, a first end, and a second end spaced from said first end along said longitudinal axis, said body comprising:
a cylindrical wall having an outer surface and an inner surface, said inner surface defining a central void to receive a single suture there through, the single suture having a central axis and an outer suture circumference with nine regions evenly distributed about the central axis of the single suture, said central void having a cross-section with a size, said cylindrical wall being configured to be radial expandable and radially collapsible,
wherein said inner surface is operable to move radially outward to increase said size of said cross-section to receive the single suture therein and to move radially inward to decrease said size of said cross-section,
wherein, when a portion of the single suture is in said central void and said cylindrical wall is radially collapsed onto the portion of the single suture, said inner surface is configured to contact each of the nine regions of the single suture and to impart radially inward compression on the portion of the single suture about the outer suture circumference to thereby retain the single suture therein,
wherein said inner surface includes multiple grooves, each groove of said multiple grooves is spaced about a longitudinal axis of said central void and extends between said first end and said second end of said body,
wherein said multiple grooves form a set of inside fingers, and said outer surface includes a set of outside fingers, and
wherein each of said set of outside fingers includes a hinge with a hinge axis parallel to the central axis of the single suture.
2. The suture anchor of claim 1 wherein said multiple grooves comprise a first groove, a second grove, a third groove, and a fourth groove.
3. The suture anchor of claim 2 , wherein said inner surface comprises:
a first portion positioned between said first groove and said second grove; and
a second portion of said inner surface positioned between said third and fourth grooves.
4. The suture anchor of claim 1 , wherein said body is configured to receive the single suture through said central void of said body such that said body provides greater than or equal to 2500 psi over an area of the suture measuring 0.05 square inches or less.
5. The suture anchor of claim 1 , wherein said set of outside fingers comprises at least 7 radial fingers.
6. The suture anchor of claim 1 , further comprising a retaining collar configured to receive said body.
7. The suture anchor of claim 6 , wherein said first end forms an insertion end into said retaining collar, and wherein a minimum transverse dimension of said central void at said first end is greater than or equal to a minimum transverse dimension of said central void at said second end.
8. The suture anchor of claim 7 , wherein a maximum transverse dimension of said outer surface at said first end is less than or equal to a maximum transverse dimension of said outer surface at said second end.
9. The suture anchor of claim 6 , wherein said retaining collar is configured to compress said first end of said body such that a radial arrangement of compressive fingers is configured to impart radial compression on the single suture inserted within said central void of said body when said body is positioned in said retaining collar.
10. The suture anchor of claim 6 , wherein each groove of said multiple grooves extends radially outward from said longitudinal axis of said central void of said body.
11. The suture anchor of claim 6 , wherein said retaining collar comprises:
a channel;
a first end configured to be inserted into a bone; and
a second end having a flange extending outward from said channel of said retaining collar, said flange configured to contact a surface of the bone such that said flange limits movement of said retaining collar in a first direction toward the bone.
12. The suture anchor of claim 11 , wherein said channel of said retaining collar has a maximum transverse dimension at said first end of said retaining collar that less than said maximum transverse dimension of said outer surface of said body at said first end of said body.
13. The suture anchor of claim 11 , wherein said first end of said retaining collar is configured to compress said first end of said body such that each groove of said multiple grooves applies a radially inward pressure onto the single suture extending through said central void of said body.
14. The suture anchor of claim 1 , in combination with a tool for deployment of said suture anchor, said tool comprising:
an upper forked member and a lower forked member, said upper forked member and said lower forked member configured in a scissor-like fashion, said lower forked member is configured to secure and position said suture anchor;
an auxiliary lever operable to grip a suture associated with said suture anchor, said auxiliary lever comprises a positioning conduit operable to adjust a tension level of the single suture; and
a tension retaining member configured to maintain a first level of tension on the single suture.
15. The suture anchor of claim 14 , wherein said outside fingers of said outer surface includes a radial arrangement.
16. The suture anchor of claim 15 , wherein said outside fingers comprise at least 7 outside fingers.
17. A suture anchor comprising:
a body having a longitudinal axis, a first end, and a second end spaced from said first end along said longitudinal axis, the body including:
a cylindrical wall having an outer surface and an inner surface, said inner surface defining a central void to receive a suture there through, the suture having an outer suture circumference and a central suture axis, said central void having a cross-section with a size, said cylindrical wall including a hinge configured to facilitate radial expansion and radial collapse of said cylindrical wall, said hinge including a hinge axis that is substantially parallel to the central suture axis of the suture,
wherein said inner surface is operable to move radially outward to increase said size of said cross-section to receive the suture therein and to move radially inward to decrease said size of said cross-section,
wherein, when a portion of the suture is in said central void and said cylindrical wall is radially collapsed onto the portion of the suture, said inner surface is configured to contact and impart radially inward compression on the portion of the suture to thereby retain the suture therein,
wherein said inner surface includes multiple grooves, each groove of said multiple grooves is spaced about a longitudinal axis of said central void and extends between said first end and said second end of said body, and
wherein a first one of a set of outside fingers includes said hinge, and wherein outside fingers of said set other than said first one each includes a hinge with a hinge axis parallel to the central suture axis.
18. The suture anchor of claim 17 wherein said inner surface is configured to contact and to impart radially inward compression on the portion of the suture about a majority of the outer suture circumference to thereby retain the suture therein.
19. The suture anchor of claim 17 wherein said hinge is a living hinge with said hinge axis being a living hinge axis.
20. The suture anchor according to claim 17 wherein said multiple grooves form a set of inside fingers, and said outer surface includes said set of outside fingers.
21. The suture anchor of claim 17 comprising a retaining collar configured to receive said body.
22. The suture anchor of claim 21 , wherein said retaining collar is configured to compress said first end of said body such that a radial arrangement of compressive fingers is configured to impart radial compression on the suture inserted within said central void of said body when said body is positioned in said retaining collar.
23. The suture anchor of claim 21 , wherein said retaining collar includes:
a channel;
a first end configured to be inserted into a bone; and
a second end having a flange extending outward from said channel of said retaining collar, said flange configured to contact a surface of the bone such that said flange limits movement of said retaining collar in a first direction toward the bone.