Rod system including at least two rods and connector device for rods
A rod system, in particular, for the spine, includes a first rod, a second rod, and a connector for connecting the first rod and the second rod. The connector includes a main body defining a first rod seat configured to hold the first rod in a fixed manner and a second rod seat configured to accommodate a second rod, and a fixation member and a closure member that are interchangeably mountable to the main body. When the fixation member is mounted to the main body, the fixation member is engageable with the portion of the second rod to hold the second rod in a fixed manner relative to the main bod, while when the closure member is mounted to the main body, the closure member is configured to hold the second rod to the main body in a slidable manner.
1. A rod system, in particular, for the spine, comprising:
a first rod;
a second rod; and
a connector for connecting the first rod and the second rod to one another, the connector comprising:
a main body defining a first rod seat that extends along a first longitudinal axis and that is configured to hold a portion of the first rod in a fixed manner, a second rod seat that extends along a second longitudinal axis and that is configured to accommodate a portion of the second rod, and an orifice; and
a fixation member and a separate closure member shaped differently from the fixation member that are interchangeably to receivable in the orifice of the main body;
wherein when the fixation member is received in the orifice of the main body, the fixation member is engageable with the portion of the second rod to hold the second rod in a fixed manner relative to the main body; and
wherein when the closure member is received in and fully advanced into the orifice of the main body, the closure member is configured to hold the second rod to the main body in a slidable manner while the first rod is held in the fixed manner relative to the main body.
2. The rod system of claim 1 , wherein the fixation member is further mountable to the main body to engage the portion of the first rod to hold the first rod in the fixed manner relative to the main body.
3. The rod system of claim 2 , wherein the fixation member is mountable to the main body to hold the first rod in the fixed manner relative to the main body while the second rod remains slidable relative to the main body.
4. The rod system of claim 1 , wherein the orifice defines a threaded bore positioned laterally to one side of the second rod seat, the fixation member comprises a screw with a head configured to directly engage the second rod, and the closure member comprises a screw with a head that is prevented from engaging the second rod.
5. The rod system of claim 1 , wherein the orifice is sized to substantially fully receive either the fixation member or the closure member in an axial direction.
6. The rod system of claim 5 , wherein the orifice is sized to substantially fully receive both the fixation member and the closure member in the axial direction in an interchangeable manner.
7. The rod system of claim 1 , wherein the connector further comprises at least one sliding member positioned in the second rod seat to facilitate sliding of the second rod.
8. The rod system of claim 7 , wherein the at least one sliding member is configured to directly contact at least part of an inner cylindrical surface of the second rod seat.
9. The rod system of claim 1 , wherein the longitudinal axes of the first rod seat and the second rod seat are substantially parallel.
10. The rod system of claim 1 , wherein at least one of the first rod seat or the second rod seat is substantially closed around the respective longitudinal axis.
11. The rod system of claim 10 , wherein at least part of the at least one of the first rod seat or the second rod seat is fully closed in a circumferential direction around the respective longitudinal axis.
12. The rod system of claim 1 , wherein the fixation member is a first fixation member, and wherein the rod system further comprises a second fixation member, and wherein the first and second fixation members are respectively mountable to the main body to hold both the first rod and the second rod in a fixed manner relative to the main body.
13. The rod system of claim 12 , wherein the first and second fixation members are substantially similar and interchangeably mountable to the main body for fixing the first and second rods to the main body.
14. The rod system of claim 12 , wherein the first fixation member is mountable to the main body to hold the first rod in a fixed manner relative to the main body independent of fixation of the second rod to the main body, and wherein the second fixation member is receivable in the orifice of the main body to hold the second rod in a fixed manner relative to the main body independent of fixation of the first rod to the main body.
15. The rod system of claim 1 , wherein an opening connects the orifice to the second rod seat while the orifice is completely separated from the first rod seat without an opening therebetween.
16. The rod system of claim 15 , wherein at least part of the fixation member is configured to extend from the orifice through the opening to the second rod seat to directly engage and hold the second rod in a fixed manner relative to the main body.
17. The rod system of claim 16 , wherein when the closure member is fully inserted into the orifice, the closure member is configured to remain spaced apart from the second rod seat and the second rod that is held therein to facilitate holding of the second rod in the slidable manner relative to the main body.
18. The rod system of claim 1 , wherein the fixation member is directly engageable with the portion of the second rod to hold the second rod in the fixed manner relative to the main body.
19. The rod system of claim 18 , wherein the closure member is prevented from directly engaging the second rod even when closure member is received in the orifice and fully tightened relative to the main body.