Oblong cross-sectional tissue fixation peg
Disclosed are fixation devices that can be utilized to approximate and hold a soft tissue in, at, or near a bony insertion site. Disclosed devices can define an oblong cross-section, and can include ribs defining sharp edges on the periphery of one aspect of the cross section that can tightly fix the device to surrounding bone so as to avoid pull out of the device. Devices can also include ribs defining rounded ridges on the periphery of a second, perpendicular aspect of the cross section that can allow soft tissue or a portion of an approximation device, for instance a soft tissue graft or cellular scaffolding material, to be fixed within a bone without damage to the soft tissue.
1. A tissue fixation device comprising
a proximal end and a distal end and defining a longitudinal axis from the proximal end to the distal end, the tissue fixation device further defining
a first cross sectional area along at least a portion of and perpendicular to the longitudinal axis, the first cross sectional area defining
a periphery and including a first aspect having a first length and a second aspect that is perpendicular to the first aspect and having a second length,
wherein the first length is greater than the second length such that the cross sectional area is oblong; and further comprising
a first rib extending from a first portion of the periphery of the first cross sectional area, the first portion of the periphery including a terminus of the first aspect, wherein the first rib defines a sharp edge, the device also comprising
a second rib distinct from the first rib and in a same cross sectional plane of the device as the first rib and extending from a second portion of the periphery of the first cross sectional area, the second portion of the periphery including a terminus of the second aspect, wherein the second rib defines a rounded ridge.
2. The tissue fixation device according to claim 1 , wherein the sharp edge is oriented toward the proximal end of the device.
3. The tissue fixation device according to claim 1 , further defining a transverse aperture through the device, the transverse aperture being generally perpendicular to the longitudinal axis of the tissue fixation device.
4. The tissue fixation device according to claim 3 , wherein the transverse aperture is aligned with the second aspect of the first cross sectional area.
5. The tissue fixation device according to claim 3 , wherein a distance from a center of the transverse aperture to the distal end is less than a distance from the center of the transverse aperture to the proximal end.
6. The tissue fixation device according to claim 3 , wherein the transverse aperture is circular, ovoid, triangular or elliptical.
7. The tissue fixation device according to claim 1 , wherein the distal end defines a second cross sectional area that is smaller than the first cross sectional area.
8. The tissue fixation device according to claim 1 , wherein the tissue fixation device is between about 5 millimeters and about 30 millimeters in length as measured from the proximal end to the distal end.
9. The tissue fixation device according to claim 1 , wherein the first length is between about 2 millimeters and about 10 millimeters.
10. The tissue fixation device according to claim 1 , wherein the second length is between about 1 millimeter and about 6 millimeters.
11. The tissue fixation device according to claim 1 , further defining an inset in the proximal end configured to interface with a delivery mechanism.
12. The tissue fixation device according to claim 11 , where in the inset is threaded.
13. The tissue fixation device according to claim 1 , further defining a protrusion in the proximal end configured to interface with a delivery mechanism.
14. The tissue fixation device according to claim 1 , wherein the tissue fixation device is sterile.
15. The tissue fixation device according to claim 1 , wherein the first cross sectional area is an ellipse.
16. The tissue fixation device according to claim 1 , wherein the first cross sectional area is a rectangle.
17. The tissue fixation device according to claim 1 , further comprising two or more apertures that are generally perpendicular to the longitudinal axis.
18. The tissue fixation device according to claim 17 , wherein the apertures are parallel with one another.
19. The tissue fixation device according to claim 17 , wherein the apertures are aligned with the shorter aspect of the oblong cross sectional area of the device.
20. The tissue fixation device according to claim 17 , further comprising grooves that are aligned parallel to the longitudinal axis and extend from the apertures to the proximal end of the device.
21. The tissue fixation device according to claim 1 , wherein at least a portion of the cross sectional area of the device tapers with respect to the longitudinal axis from the proximal to the distal end.
22. The tissue fixation device according to claim 1 in combination with a tissue approximation device, the tissue approximation device comprising a mechanical reinforcing component and a cellular scaffold component.
23. The tissue fixation device according to claim 1 , wherein the first cross sectional area is an ovoid.
24. The tissue fixation device according to claim 1 , comprising more than one rib defining a sharp edge and more than one rib defining a rounded ridge.
25. The tissue fixation device according to claim 24 , wherein the number of ribs defining a sharp edge is different than the number of ribs defining a rounded ridge.
26. The tissue fixation device according to claim 24 , comprising an equal number of ribs defining a sharp edge on two opposing portions of the device and an equal number of ribs defining a rounded ridge on two opposing portions of the device.