US 20070055243 A1
A fastener assembly for a spinal fixation system that is particularly useful in treatment of pediatric and small-statured patients includes a fastener, an attachment member, and a locking member. The fastener has a lower portion for contacting a bone and an upper portion integral with the lower portion. The upper portion has two open channels. Each channel is configured and dimensioned to receive a portion of a longitudinal or connecting member along its circumference. The attachment member is positionable on the fastener and at least partially covers the channel that receives the longitudinal or connecting member. The locking member is operatively associated with the upper portion of the fastener and secures the attachment member and the longitudinal or connecting member to the fastener.
1. A connector for securing a longitudinal member to a fastener assembly of a spinal fixation system comprising:
a shaft having a longitudinal axis and first and second ends,
the first end having a hook with inner and outer surfaces, the inner surface having a concave shape, the hook having an opening opposite the inner surface to receive the longitudinal member, the hook being configured to secure the longitudinal member to the inner surface while maintaining the opening, and
the second end having a circumference and ridges around the circumference for engaging the fastener assembly, wherein the ridges are configured and dimensioned to interlock with a portion of the fastener assembly to prevent rotation of the shaft relative to the fastener assembly.
2. The connector of
3. The connector of
4. The connector of
5. The connector of
6. A spinal fixation system comprising:
the connector of
a fastener assembly comprising a main body, the main body having a channel dimensioned and configured to receive a portion of the second end of the connector, the main body also having either a distal threaded portion or a distal hook portion for engaging bone.
7. The spinal fixation system of
8. The spinal fixation system of
9. The spinal fixation system of
10. The spinal fixation system of
11. The spinal fixation system of
12. The spinal fixation system of
the hook of the connector has a bore extending from the outer surface to the inner surface perpendicularly to the longitudinal axis of the shaft, the bore configured and dimensioned to receive a set screw for pinning the longitudinal member to the inner surface of the hook; and
the attachment member engages the proximal portion of the main body in a direction perpendicular to the longitudinal axis of the shaft.
13. The spinal fixation system of
14. The spinal fixation system of
15. The spinal fixation system of
16. The spinal fixation system of
17. The spinal fixation system of
a cylinder having upper, lower, and side surfaces with a bore extending through the upper and lower surfaces, the cylinder defining a longitudinal axis lying in a central plane;
a slot extending through the cylinder offset from and parallel to the central plane of the cylinder; and
a protrusion extending from the lower surface on an opposite side of the central plane of the cylinder from the slot.
18. The spinal fixation system of
19. The spinal fixation system of
20. The spinal fixation system of
This is a continuation of pending U.S. application Ser. No. 10/647,587, filed Aug. 26, 2003, now U.S. Pat. No. ______, which is a continuation of U.S. application Ser. No. 09/915,572, filed Jul. 27, 2001, now U.S. Pat. No. 6,610,063, which claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Application No. 60/221,518, filed Jul. 28, 2000. The entire contents of each are expressly incorporated herein by reference thereto.
The invention relates to a spinal fixation system, and in particular to a fastener assembly for securing a longitudinal support along a spinal column.
Stabilization of the spine is often required following trauma, tumor, or degenerative pathologies. Each region of the spine presents unique clinical challenges as several vital neural and vascular structures including the vertebral arteries, nerve roots, and spinal cord must be avoided during surgery. The anatomy of pediatric and small-statured patients presents additional challenges that makes assisting such patients even more difficult. For example, because these patients are small in stature, lower profile systems are required. Also, it may be required to add fastener assemblies to an already assembled system, especially in pediatric patients. At the same time, it is desirous to keep inventory at a minimum and have an assembly that requires as few components as possible.
Current methods of spinal fixation are not particularly well-suited for smaller statured patients. U.S. Pat. No. 5,737,685 to Halm et al. discloses a bone screw that has a threaded shaft and a fork head. The fork head has two legs which define a single groove that opens in the vertical direction for receiving a corrective pin. The upper end of the fork head has an outside thread and a head nut is screwed onto the outer thread. The head nut has inner threads which a fastening screw is screwed to press onto the corrective pin. Because the groove opens in a vertical direction it is difficult to add additional screws to an already installed fixation system.
U.S. Pat. No. 5,530,441 to Sherman et al. discloses an attachment plate configured for use with a spinal fixation element that has a posteriorly projecting central post. The attachment plate is generally L-shaped with an eyebolt engaging portion and a fixation element clamping portion. The fixation element has grooves in the lateral surfaces of the central post and one lateral surface of the post contacts the spinal rod when the rod extends through an aperture of an eyebolt assembly. A flange extends from the attachment plate and is configured to engage the opposite lateral surface of the post and the attachment plate includes a camming segment to provide a clamping force component directed toward the flange to clamp the spinal rod to the fixation element post when a nut is threaded onto the eyebolt threaded post. The attachment plate has a slot in the eyebolt engaging portion for receiving the posteriorly projecting threaded post of the eyebolt body. Because the eyebolt must be pre-assembled onto the spinal rod, it is difficult to add additional fixation elements to an already installed system.
U.S. Pat. No. 4,653,481 to Howland et al. discloses a spinal support system that includes a plurality of screw clamp assemblies. Each screw clamp assembly has a threaded end for placement into the vertebra and a saddle assembly removably attached to the screw formed of upper and lower halves. Each of the upper and lower halves of the saddle assembly are provided with at least one pair of mating grooves for accepting a spinal rod. All embodiments shown and described in the Howland '481 patent have a two-part saddle assembly that is removable from the screw clamp shaft member.
In view of the foregoing, a need exists for an improved fixation apparatus for stabilizing the spine that can be assembled to an already installed fixation system and that has minimal components.
The invention relates to a fastener assembly for a spinal fixation system. The fastener assembly includes a fastener, an attachment member, and a locking member. The fastener has a lower portion for contacting a bone and a upper portion integral with the lower portion and having two open channels. Each channel is configured and dimensioned for receiving a portion of the longitudinal member along its circumference. The attachment member is positionable on the fastener and at least partially covers the channel that receives the longitudinal member. The attachment member is configured and dimensioned for receiving another portion of the longitudinal member along its circumference. The locking member is operatively associated with the upper portion of the fastener and secures the attachment member and longitudinal member to the fastener.
The fastener can be a hook or a screw with the lower portion having a threaded end for engaging a vertebra. If the fastener is a hook, the hook can be provided with an arcuate portion and a flat portion for facilitating implantation. The arcuate portion can have a dimple on a posterior surface to further facilitate implantation. In one embodiment, the locking member is a nut and the upper portion of the fastener has a shaft with external threads to accept the locking member.
The two channels of the fastener are preferably disposed on opposite sides of a central plane of the fastener with the two channels extending orthogonally with respect to the fastener longitudinal axis and equidistant from the proximal end of the fastener. A bore can be positioned transversely to the longitudinal axis and between the two channels.
In an exemplary embodiment, the attachment member includes a cylinder having upper, lower, and side surfaces with a bore extending through the upper and lower surfaces and defining a longitudinal axis lying in a central plane; a slot extending through the cylinder offset from the central plane and parallel with the central plane; and a protrusion extending from the bottom surface on an opposite side of the central plane from the slot. The channels can define a seat for accepting the protrusion of the attachment member. The slot can be provided with serrations along the inner surface. The slot can also have an eccentric cross-sectional shape with a geometry substantially conforming to a diameter of the longitudinal member.
The fastener can have a cavity extending longitudinally from the distal end for receiving a manipulation device. This manipulation device includes a ball detent mechanism and a groove extending transversely to the cavity and around its circumference for receiving the ball detent mechanism. Alternatively, the manipulation device has a threaded end and the cavity of the fastener is cylindrical and includes threads along the interior.
Each channel 35 is configured and dimensioned for receiving at least a portion of the longitudinal member 18. In a preferred embodiment, longitudinal member 18 is an elongate rigid rod having a circular cross-section taken in a plane extending perpendicular to the longitudinal central axis of the rod. As best seen in
Referring again to
Locking member 16 substantially resembles a nut and has a generally disc-like shape with top 60, bottom 61 and side 62 surfaces with a hole 63 extending centrally through the top 60 and bottom 61 surfaces. The hole 63 is provided with internal threading 64 which mates with external threading 34 provided on shaft 26 of upper portion 22. As such, locking member 16 is tightenable on the shaft 26 and the bottom surface 61 contacts the upper surface 48 of the attachment member 14 to force the attachment member 14 downward toward the lower portion 20 as locking member 16 is tightened. Side surface 62 is preferably provided with a polygonal geometric configuration comprising twelve points to facilitate tightening.
The slot 56 has a generally cylindrical cross-section and has a geometry substantially conforming to the diameter of the longitudinal member 18. Preferably, slot 56 has an eccentrically shaped cross-section. Referring to
As shown in
Referring again to
Preferably a generally rectangular groove 72 extends transverse to the hexagon socket 38 and around the circumference of the cavity 37. As shown in
In use, a plurality of fastener assemblies 10 are inserted into the vertebra along the spine with the aid of the manipulation device 70 and the longitudinal member 18 is placed in one of the two channels 35 on each of the fasteners 12. An attachment member 14 is placed onto each of the fasteners 12 so that the longitudinal member 18 is held in the channel 35 by the slot 56 of attachment member 14. A locking member 16 is then used to secure the longitudinal member 18 in the channel 35. Also, a transverse bar 66 can be secured to the longitudinal member 18 to couple the longitudinal member 18 to a laterally positioned fastener 12. In that case, the hooked end 132 of the transverse bar 66 is held to the longitudinal member 18 by a set screw 134 and the opposite end 138 of the transverse bar 66 is secured to the fastener 12 by an attachment member 14 in the same fashion as described above for the longitudinal member 18.
Because of the dual-channel structure of the fastener 12, a surgeon implementing a spinal fixation system may insert the longitudinal member 18 in either channel 35. Also, because the slot 56 is offset with respect to central axis 24, the attachment member 14 may be located on either side of fastener 12 and the longitudinal member 18 may be secured to either one of channels 35. As a result, fastener assembly 10 may be assembled on either side of the spinal column using the identical components. Further, the integral nature of the upper and lower portions 22, 20 allows for easy assembly to an already installed spinal fixation system. Because the channels 35 open laterally fastener 12 can be anchored to a vertebra and longitudinal member 18 may be laterally received in upper portion 22 and attachment member 14 can be vertically assembled there over to secure the longitudinal member in place, and no preassembly is required.
While it is apparent that the illustrative embodiments of the invention herein disclosed fulfill the objectives stated above, it will be appreciated that numerous modifications and other embodiments may be devised by those skilled in the art. Therefore, it will be understood that the appended claims are intended to cover all such modifications and embodiments which come within the spirit and scope of the invention.