Tapered-lock spinal rod connectors and methods for use
View Patent ↗A spine stabilization system having cylindrical bodies, plates, transverse members and resilient inserts for coupling a rod to bone fasteners. A first resilient insert may be positioned on a first rod. A cylindrical body, plate or transverse member may be positioned on the first resilient insert such that the first resilient insert is in a passage. A second resilient insert may be positioned on a second rod and positioned in the cylindrical body, plate or transverse member. The resilient inserts are advanced into the cylindrical body, plate or transverse member to lock the resilient inserts in place and couple the rods.
1. An apparatus for joining two rods, comprising:
a first resilient insert comprising:
a first set of two deflectable arms; and
a first channel formed between the first set of two deflectable arms, wherein the first channel has a width approximately equal to the diameter of a first spinal rod;
a second resilient insert comprising:
a second set of two deflectable arms; and
a second channel formed between the second set of two deflectable arms,
wherein the second channel has a width approximately equal to the diameter of a second spinal rod,
wherein the first spinal rod and the second spinal rod have similar or dissimilar diameter or shape; and
a body having a first opening at a first end, a second opening at a second end, and a passage in communication with the first opening and the second opening from the first end to the second end, wherein the first opening has an inner diameter, the second opening has an inner diameter, and the passage has an inner diameter,
wherein the first resilient insert has a portion having an outer diameter greater than the inner diameter of the first opening of the body when the first resilient insert is in a neutral state,
wherein advancement of the first resilient insert into the first opening of the body deflects the first set of two deflectable arms inward, causing the width of the first channel to decrease, thereby holding the first spinal rod at the first end of the body, and
wherein the second resilient insert has a portion having an outer diameter greater than the inner diameter of the second opening of the body when the second resilient insert is in a neutral state,
wherein advancement of the second resilient insert into the second opening of the body deflects the second set of two deflectable arms inward, causing the width of the second channel to decrease, thereby holding the second spinal rod at the second end of the body.
2. The apparatus of claim 1 , wherein at least one of the first set of two deflectable arms and the second set of the two deflectable arms comprise beveled surfaces proximate the first channel or the second channel.
3. The apparatus of claim 1 , wherein at least one of the first set of two deflectable arms and the second set of the two deflectable arms comprise radiused surfaces proximate the first channel or the second channel.
4. The apparatus of claim 1 , wherein at least one of the first end and the second end of the body comprises two recessed portions, wherein each recessed portion has an associated width greater than the diameter of the first spinal rod or the second spinal rod.
5. The apparatus of claim 1 , wherein the first channel in the first resilient insert comprises a first slot, wherein compression of the first slot deflects the first set of two deflectable arms inward to decrease the width of the first channel.
6. The apparatus of claim 1 , wherein the second channel in the second resilient insert comprises a second slot, wherein compression of the second slot deflects the second set of two deflectable arms inward to decrease the width of the second channel.
7. The apparatus of claim 1 , wherein at least one of the first resilient insert and the second resilient insert is cannulated.
8. The apparatus of claim 1 , wherein at least one of the first set of two deflectable arms and the second set of two deflectable arms has a first width and a second width that is greater than the first width,
wherein advancement of the first resilient insert into the first opening of the body comprises advancement of the first resilient insert until the first width thereof contacts interior walls of the first end of the body and the second width thereof is compressed against the interior walls of the first end of the body, and
wherein advancement of the second resilient insert into the second opening of the body comprises advancement of the second resilient insert until the first width thereof contacts interior walls of the second end of the body and the second width thereof is compressed against the interior walls of the second end of the body.
9. The apparatus of claim 1 , wherein at least one of the first resilient insert and the second resilient insert comprises a pin.
10. The apparatus of claim 9 , wherein the body further comprises a groove and wherein the pin is configured to engage with the groove in the passage.
11. A system for stabilizing a portion of a spine, comprising:
a first spinal rod having a substantially circular cross-sectional geometry:
a second spinal rod having a substantially circular cross-sectional geometry,
wherein the first spinal rod and the second spinal rod have similar or dissimilar diameter or shape; and
a spinal rod connector comprising:
a first resilient insert comprising:
a first set of two deflectable arms; and
a first channel formed between the first set of two deflectable arms;
a second resilient insert comprising:
a second set of two deflectable arms; and
a second channel formed between the second set of two deflectable arms; and
a body having a first opening at a first end, a second opening at a second end, and a passage in communication with the first opening and the second opening from the first end to the second end, wherein the first opening has an inner diameter, the second opening has an inner diameter, and the passage has an inner diameter,
wherein the first resilient insert has a portion having an outer diameter greater than the inner diameter of the first opening of the body when the first resilient insert is in a neutral state,
wherein advancement of the first resilient insert into the first opening of the body deflects the first set of two deflectable arms inward, causing the width of the first channel to decrease, thereby holding the first spinal rod at the first end of the body, and
wherein the second resilient insert has a portion having an outer diameter greater than the inner diameter of the second opening of the body when the second resilient insert is in a neutral state,
wherein advancement of the second resilient insert into the second opening of the body deflects the second set of two deflectable arms inward, causing the width of the second channel to decrease, thereby holding the second spinal rod at the second end of the body.
12. The system of claim 11 , wherein at least one of the first set of two deflectable arms and the second set of the two deflectable arms comprise beveled surfaces proximate the first channel or the second channel.
13. The system of claim 11 , wherein at least one of the first set of two deflectable arms and the second set of the two deflectable arms comprise radiused surfaces proximate the first channel or the second channel.
14. The system of claim 11 , wherein the second end of the cylindrical body comprises two recessed portions, wherein each recessed portion has an associated width greater than the diameter of the second spinal rod.
15. The system of claim 11 , wherein the first channel in the first resilient insert comprises a first slot, wherein compression of the first slot deflects the first set of two deflectable arms inward to decrease the width of the first channel.
16. The system of claim 11 , wherein the second channel in the second resilient insert comprises a second slot, wherein compression of the second slot deflects the second set of two deflectable arms inward to decrease the width of the second channel.
17. The system of claim 11 , further comprising:
two or more bone fasteners, wherein each bone fastener comprises:
a threaded shank for advancement into a vertebral body; and
a head connected to the threaded shank, wherein coupling the first spinal rod or the second spinal rod to the head inhibits motion of the vertebral body relative to the first spinal rod or the second spinal rod.
18. The system of claim 11 , wherein at least one of the first resilient insert and the second resilient insert comprises a pin.
19. The system of claim 18 , wherein the body of the spinal rod connector further comprises a groove and wherein the pin is configured to engage with the groove in the passage.