US20050203513A1 - Spinal stabilization device - Google Patents
Spinal stabilization device Download PDFInfo
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- US20050203513A1 US20050203513A1 US11/009,097 US909704A US2005203513A1 US 20050203513 A1 US20050203513 A1 US 20050203513A1 US 909704 A US909704 A US 909704A US 2005203513 A1 US2005203513 A1 US 2005203513A1
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- connection unit
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Definitions
- the present invention relates to a method and system for stabilizing a spinal column and, more particularly, to a method and system of spinal fixation in which one or more screw type securing members are implanted and fixed into a portion of a patient's spinal column and a longitudinal member including flexible, semi-rigid rod-like or plate-like structures of various cross-sections (hereinafter referred to as “rods” or “plates”, respectively) are connected and fixed to the upper ends of the securing members to provide stabilization of the spinal column.
- rods flexible, semi-rigid rod-like or plate-like structures of various cross-sections
- Degenerative spinal column diseases such as disc degenerative diseases (DDD), spinal stenosis, spondylolisthesis, and so on, need surgical operation if they do not take a turn for the better by conservative management.
- spinal decompression is the first surgical procedure that is performed.
- the primary purpose of decompression is to reduce pressure in the spinal canal and on nerve roots located therein by removing a certain tissue of the spinal column to reduce or eliminate the pressure and pain caused by the pressure. If the tissue of the spinal column is removed the pain is reduced but the spinal column is weakened. Therefore, fusion surgery (e.g., ALIF, PLIF or posterolateral fusion) is often necessary for spinal stability following the decompression procedure.
- fusion takes additional time to achieve maximum stability and a spinal fixation device is typically used to support the spinal column until a desired level of fusion is achieved.
- a spinal fixation surgery can sometimes be performed immediately following decompression, without performing the fusion procedure. The fixation surgery is performed in most cases because it provides immediate postoperative stability and, if fusion surgery has also been performed, it provides support of the spine until sufficient fusion and stability has been achieved.
- Conventional methods of spinal fixation utilize a rigid spinal fixation device to support an injured spinal part and prevent movement of the injured part.
- These conventional spinal fixation devices include: fixing screws configured to be inserted into the spinal pedicle or sacral of the backbone to a predetermined depth and angle, rods or plates configured to be positioned adjacent to the injured spinal part, and coupling elements for connecting and coupling the rods or plates to the fixing screws such that the injured spinal part is supported and held in a relatively fixed position by the rods or plates.
- U.S. Pat. No. 6,193,720 discloses a conventional spinal fixation device, in which connection members of a rod or plate type are mounted on the upper ends of at least one or more screws inserted into the spinal pedicle or sacral of the backbone.
- the connection units such as the rods and plates, are used to stabilize the injured part of the spinal column which has been weakened by decompression.
- the connection units also prevent further pain and injury to the patient by substantially restraining the movement of the spinal column.
- the spinal fixation device can cause ill effects, such as “junctional syndrome” (transitional syndrome) or “fusion disease” resulting in further complications and abnormalities associated with the spinal column.
- the Graf band is one example of a non-fusion fixation device that is applied after decompression without bone fusion.
- the Graf band is composed of a polyethylene band and pedicle screws to couple the polyethylene band to the spinal vertebrae requiring stabilization.
- the primary purpose of the Graf band is to prevent sagittal rotation (flexion instability) of the injured spinal parts.
- sagittal rotation flexion instability
- it is effective in selected cases but is not appropriate for cases that require greater stability and fixation. See, Kanayama et al, Journal of Neurosurgery 95(1 Suppl):5-10, 2001, Markwalder & Wenger, Acta Neurochrgica 145(3):209-14.).
- Dynesys Another non-fusion fixation device called “Dynesys” has recently been introduced. See Stoll et al, European Spine Journal 11 Suppl 2:S170-8, 2002, Schmoelz et. al., J. of Spinal Disorder & Techniques 16(4):418-23, 2003.
- the Dynesys device is similar to the Graf band except it uses a polycarburethane spacer between the screws to maintain the distance between the heads of two corresponding pedicle screws and, hence, adjacent vertebrae in which the screws are fixed.
- Early reports by the inventors of the Dynesys device indicate it has been successful in many cases. However, it has not yet been determined whether the Dynesys device can maintain long-term stability with flexibility and durability in a controlled study. Because it has polyethylene components and interfaces, there is a risk of mechanical failure. Furthermore, due to the mechanical configuration of the device, the surgical technique required to attach the device to the spinal column is complex and complicated.
- U.S. Pat. Nos. 5,282,863 and 4,748,260 disclose a flexible spinal stabilization system and method using a plastic, non-metallic rod.
- U.S. patent publication no. 2003/0083657 discloses another example of a flexible spinal stabilization device that uses a flexible elongate member. These devices are flexible but they are not well-suited for enduring long-term axial loading and stress. Additionally, the degree of desired flexibility vs. rigidity may vary from patient to patient. The design of existing flexible fixation devices are not well suited to provide varying levels of flexibility to provide optimum results for each individual candidate. For example, U.S. Pat. No.
- 5,672,175 discloses a flexible spinal fixation device which utilizes a flexible rod made of metal alloy and/or a composite material. Additionally, compression or extension springs are coiled around the rod for the purpose of providing de-rotation forces on the vertebrae in a desired direction.
- this patent is primarily concerned with providing a spinal fixation device that permits “relative longitudinal translational sliding movement along [the] vertical axis” of the spine and neither teaches nor suggests any particular designs of connection units (e.g., rods or plates) that can provide various flexibility characteristics.
- Prior flexible rods such as that mentioned in U.S. Pat. No. 5,672,175 typically have solid construction with a relatively small diameter in order to provide a desired level of flexibility. Because they are typically very thin to provide suitable flexibility, such prior art rods are prone to mechanical failure and have been known to break after implantation in patients.
- a doctor incises the midline of the back to about 10-15 centimeters, and then, dissects and retracts it to both sides. In this way, the doctor performs muscular dissection to expose the outer part of the facet joint.
- the doctor finds an entrance point to the spinal pedicle using radiographic devices (e.g., C-arm flouroscopy), and inserts securing members of the spinal fixation device (referred to as “spinal pedicle screws”) into the spinal pedicle.
- the connection units e.g., rods or plates
- the connection units are attached to the upper portions of the pedicle screws in order to provide support and stability to the injured portion of the spinal column.
- the patient's back is incised about 10 ⁇ 15 cm, and as a result, the back muscle, which is important for maintaining the spinal column, is incised or injured, resulting in significant post-operative pain to the patient and a slow recovery period.
- a minimally invasive surgical procedure which is capable of performing spinal fixation surgery through a relatively small hole or “window” that is created in the patient's back at the location of the surgical procedure.
- minimally invasive surgery allows a much smaller incision of the patient's affected area.
- two or more securing members e.g., pedicle screws
- the stabilizing members e.g., rods or plates
- the surgical procedure may include inserting a step dilator into the incision and then gradually increasing the diameter of the dilator. Thereafter, a tubular retractor is inserted into the dilated area to retract the patient's muscle and provide a visual field for surgery. After establishing this visual field, decompression and, if desired, fusion procedures may be performed, followed by a fixation procedure, which includes the steps of finding the position of the spinal pedicle, inserting pedicle screws into the spinal pedicle, using an endoscope or a microscope, and securing the stabilization members (e.g., rods or plates) to the pedicle screws in order to stabilize and support the weakened spinal column.
- a fixation procedure which includes the steps of finding the position of the spinal pedicle, inserting pedicle screws into the spinal pedicle, using an endoscope or a microscope, and securing the stabilization members (e.g., rods or plates) to the pedicle screws in order to stabilize and support the weakened spinal column.
- One of the most challenging aspects of performing the minimally invasive spinal fixation procedure is locating the entry point for the pedicle screw under endoscopic or microscopic visualization.
- anatomical landmarks and/or radiographic devices are used to find the entry point, but clear anatomical relationships are often difficult to identify due to the confined working space.
- the minimally invasive procedure requires that a significant amount of the soft tissue must be removed to reveal the anatomy of the regions for pedicle screw insertion. The removal of this soft tissue results in bleeding in the affected area, thereby adding to the difficulty of finding the correct position to insert the securing members and causing damage to the muscles and soft tissue surrounding the surgical area.
- conventional procedures are unnecessarily traumatic.
- Radiography techniques have been proposed and implemented in an attempt to more accurately and quickly find the position of the spinal pedicle in which the securing members will be inserted.
- it is often difficult to obtain clear images required for finding the corresponding position of the spinal pedicle using radiography techniques due to radiographic interference caused by metallic tools and equipment used during the surgical operation.
- reading and interpreting radiographic images is a complex task requiring significant training and expertise.
- Radiography poses a further problem in that the patient is exposed to significant amounts of radiation.
- prior guidance systems have been developed which guide the insertion of a pedicle screw to the desired entry point on the spinal pedicle, these prior systems have proven difficult to use and, furthermore, hinder the operation procedure.
- prior guidance systems for pedicle screw insertion utilize a long wire that is inserted through a guide tube that is inserted through a patient's back muscle and tissue. The location of insertion of the guide tube is determined by radiographic means (e.g., C-arm fluoroscope) and driven until a first end of the guide tube reaches the desired location on the surface of the pedicle bone.
- radiographic means e.g., C-arm fluoroscope
- a first end of the guide wire typically made of a biocompatible metal material, is inserted into the guide tube and pushed into the pedicle bone, while the opposite end of the wire remains protruding out of the patient's back.
- the guide tube is removed, and a hole centered around the guide wire is dilated and retracted.
- a pedicle screw having an axial hole or channel configured to receive the guide wire therethrough is guided by the guide wire to the desired location on the pedicle bone, where the pedicle screw is screw-driven into the pedicle.
- the guide wire has been very difficult to use. Because it is a relatively long and thin wire, the structural integrity of the guide wire often fails during attempts to drive one end of the wire into the pedicle bone, making the process unnecessarily time-consuming and laborious. Furthermore, because the wire bends and crimps during insertion, it does not provide a smooth and secure anchor for guiding subsequent tooling and pedicle screws to the entry point on the pedicle. Furthermore, current percutaneous wire guiding systems are used in conjunction with C-arm flouroscopy (or other radiographic device) without direct visualization with the use of an endoscope or microscope. Thus, current wire guidance systems pose a potential risk of misplacement or pedicle breakage.
- the invention addresses the above and other needs by providing an improved method and system for stabilizing an injured or weakened spinal column.
- the inventor of the present invention has invented a novel flexible spinal fixation device with an improved construction and design that is durable and provides a desired level of flexibility and stability.
- the invention provides a method and device for accurately and quickly finding a position of the spinal column in which securing members of the spinal fixation device will be inserted.
- a novel guidance/marking device is used to indicate the position in the spinal column where the securing members will be inserted.
- FIG. 1 illustrates a perspective view of a spinal fixation device in accordance with one embodiment of the invention.
- FIG. 2 illustrates a perspective view of spinal fixation device in accordance with another embodiment of the invention.
- FIG. 3 illustrates an exploded view of the coupling assembly 14 of the pedicle screw 2 of FIGS. 1 and 2 , in accordance with one embodiment of the invention.
- FIG. 4 illustrates a perspective view of a flexible rod connection unit in accordance with one embodiment of the invention.
- FIG. 5 illustrates a perspective view of a flexible rod connection unit in accordance with another embodiment of the invention.
- FIG. 6 illustrates a perspective view of a flexible rod connection unit in accordance with a further embodiment of the invention.
- FIG. 7 illustrates a perspective view of a pre-bent flexible rod connection unit in accordance with one embodiment of the invention.
- FIG. 8 illustrates a perspective, cross-sectional view of a flexible portion of connection unit in accordance with one embodiment of the invention.
- FIG. 9 illustrates a perspective, cross-sectional view of a flexible portion of connection unit in accordance with another embodiment of the invention.
- FIG. 10 illustrates a perspective, cross-sectional view of a flexible portion of connection unit in accordance with a further embodiment of the invention.
- FIG. 11 illustrates a perspective view of a flexible rod connection unit in accordance with one embodiment of the invention.
- FIG. 12A illustrates a perspective view of a flexible connection unit having one or more spacers in between two end portions, in accordance with one embodiment of the invention.
- FIG. 12B illustrates an exploded view of the flexible connection unit of FIG. 12A .
- FIG. 12C provides a view of the male and female interlocking elements of the flexible connection unit of FIGS. 12A and 12B , in accordance with one embodiment of the invention.
- FIG. 13 shows a perspective view of a flexible connection unit, in accordance with a further embodiment of the invention.
- FIG. 14 illustrates a perspective view of a spinal fixation device in accordance with another embodiment of the invention.
- FIG. 15 illustrates an exploded view of the spinal fixation device of FIG. 14 .
- FIG. 16A shows a perspective view of a flexible plate connection unit in accordance with one embodiment of the invention.
- FIG. 16B illustrates a perspective view of a flexible plate connection unit in accordance with a further embodiment of the invention.
- FIG. 16C shows a side view of the flexible plate connection unit of FIG. 16A .
- FIG. 16D shows a top view of the flexible plate connection unit of FIG. 16A .
- FIG. 16E illustrates a side view of the flexible plate connection unit of FIG. 16A having a pre-bent configuration in accordance with a further embodiment of the invention.
- FIG. 17 is a perspective view of a flexible plate connection unit in accordance with another embodiment of the invention.
- FIG. 18 illustrates a perspective view of a flexible plate connection unit in accordance with another embodiment of the invention.
- FIG. 19 illustrates a perspective view of a hybrid rod-plate connection unit having a flexible middle portion according to a further embodiment of the present invention.
- FIG. 20 is a perspective view of a spinal fixation device that utilizes the hybrid rod-plate connection unit of FIG. 19 .
- FIG. 21 illustrates a perspective view of the spinal fixation device of FIG. 1 after it has been implanted into a patient's spinal column.
- FIGS. 22A and 22B provide perspective views of spinal fixation devices utilizing the plate connection units of FIGS. 16A and 16B , respectively.
- FIG. 23A illustrates a perspective view of two pedicle screws inserted into the pedicles of two adjacent vertebrae at a skewed angle, in accordance with one embodiment of the invention.
- FIG. 23B illustrates a structural view of a coupling assembly of a pedicle screw in accordance with one embodiment of the invention.
- FIG. 23C provides a perspective view of a slanted stabilizing spacer in accordance with one embodiment of the invention.
- FIG. 23D illustrates a side view of the slanted stabilizing spacer of FIG. 23C .
- FIG. 23E is a top view of the cylindrical head of the pedicle screw of FIG. 23 .
- FIG. 24 illustrates a perspective view of a marking and guiding device in accordance with one embodiment of the invention.
- FIG. 25 is an exploded view of the marking and guidance device of FIG. 24 .
- FIG. 26A provides a perspective, cross-section view of a patient's spine after the marking and guiding device of FIG. 24 has been inserted during surgery.
- FIG. 26B provides a perspective, cross-section view of a patient's spine as an inner trocar of the marking and guiding device of FIG. 24 is being removed.
- FIGS. 27A and 27B illustrate perspective views of two embodiments of a fiducial pin, respectively.
- FIG. 28 is a perspective view of a pushing trocar in accordance with a further embodiment of the invention.
- FIG. 29A illustrates a perspective, cross-sectional view of a patient's spine as the pushing trocar of FIG. 28 is used to drive a fiducial pin into a designate location of a spinal pedicle, in accordance with one embodiment of the invention.
- FIG. 29B illustrates a perspective, cross-sectional view of a patient's spine after two fiducial pins have been implanted into two adjacent spinal pedicles, in accordance with one embodiment of the invention.
- FIG. 30 is a perspective view of a cannulated awl in accordance with one embodiment of the invention.
- FIG. 31 is a perspective, cross-sectional view of a patient's spine as the cannulated awl of FIG. 30 is being used to enlarge an entry hole for a pedicle screw, in accordance with one embodiment of the invention.
- FIG. 32 provides a perspective view of fiducial pin retrieving device, in accordance with one embodiment of the invention.
- FIG. 33 is a perspective view of a pedicle screw having an axial cylindrical cavity for receiving at least a portion of a fiducial pin therein, in accordance with a further embodiment of the invention.
- FIG. 34 is a perspective, cross-sectional view of a patient's spine after one pedicle screw has been implanted into a designated location of a spinal pedicle, in accordance with one embodiment of the invention.
- FIG. 35 is a perspective, cross-sectional view of a patient's spine after two pedicle screws have been implanted into designated locations of two adjacent spinal pedicles, in accordance with one embodiment of the invention.
- FIG. 36A is perspective view of a flexible rod for spinal fixation having a spiral groove cut therein, in accordance with one embodiment of the present invention.
- FIG. 36B provides a cross-sectional view of the flexible rod of FIG. 36A , taken along lines B-B of FIG. 36A .
- FIG. 37A illustrates a perspective view of a flexible rod for spinal fixation having transverse tunnels within the body of the rod, in accordance with one embodiment of the invention.
- FIG. 37B is a cross-sectional view of the flexible rod of FIG. 37A , taken along lines B-B of FIG. 37A .
- FIG. 38A is a perspective view of a flexible rod for spinal fixation having a spiral groove cut therein and transverse tunnels in the body of the rod, in accordance with a further embodiment of the invention.
- FIG. 38B is a top view of the flexible rod of FIG. 38A , from the perspective of lines B-B of FIG. 38A .
- FIG. 39A is a perspective view of a flexible rod for spinal fixation having transverse tunnels within the body of the rod, in accordance with another embodiment of the invention.
- FIG. 39B is a cross-sectional view of the flexible rod of FIG. 39A , taken along lines B-B of that figure.
- FIG. 39C is an alternative cross-sectional view of the flexible rod of FIG. 39A , taken along lines B-B of that figure, having substantially orthogonal transverse tunnels in the body of the rod, in accordance with a further embodiment of the invention.
- FIG. 40A illustrates a perspective view of a flexible rod for spinal fixation, in accordance with a further embodiment of the invention.
- FIG. 40B illustrates a cross-sectional view of a flexible rod for spinal fixation in accordance with a further embodiment of the invention.
- FIG. 41A illustrates a perspective view of a flexible longitudinal member connection unit in accordance with one embodiment of the invention.
- FIG. 41B illustrates a perspective view of the connection unit of FIG. 41A assembled with securing members.
- FIG. 41C illustrates a perspective view of a flexible longitudinal member trimmed to length and assembled with securing members.
- FIG. 42A illustrates a side view of a flexible longitudinal member connection unit in accordance with a further embodiment of the invention.
- FIG. 42B illustrates a side view of a flexible longitudinal member connection unit in accordance with another embodiment of the invention.
- FIG. 43A illustrates a side view of a flexible longitudinal member connection unit in accordance with another embodiment of the invention.
- FIG. 43B illustrates a perspective view of a flexible longitudinal member connection unit in accordance with another embodiment of the invention.
- FIG. 43C illustrates a side view of a flexible longitudinal member connection unit in accordance with another embodiment of the invention.
- FIG. 43D illustrates a side view of a flexible longitudinal member connection unit in accordance with another embodiment of the invention.
- FIG. 44 illustrates a perspective view of a flexible longitudinal member connection unit in accordance with a further embodiment of the invention.
- FIG. 45A illustrates a cross-section view of a flexible longitudinal member connection unit in accordance with an embodiment of the invention.
- FIG. 45B illustrates a cross-section view of a flexible longitudinal member made of two types of material in accordance with another embodiment of the invention.
- FIG. 1 depicts a spinal fixation device in accordance with one embodiment of the present invention.
- the spinal fixation device includes two securing members 2 (designated as 2 ′ and 2 ′′), and a flexible fixation rod 4 configured to be received and secured within a coupling assembly 14 , as described in further detail below with respect to FIG. 3 .
- Each securing member 2 includes a threaded screw-type shaft 10 configured to be inserted and screwed into a patient's spinal pedicle.
- the screw-type shaft 10 includes an external spiral screw thread 12 formed over the length of the shaft 10 and a conical tip at the end of the shaft 10 configured to be inserted into the patient's spinal column at a designated location.
- Other known forms of the securing member 2 may be used in connection with the present invention provided the securing member 2 can be inserted and fixed into the spinal column and securely coupled to the rod 4 .
- the spinal fixation device is used for surgical treatment of spinal diseases by mounting securing members 2 at desired positions in the spinal column.
- the rod 4 extends across two or more vertebrae of the spinal column and is secured by the securing members 2 so as to stabilize movement of the two or more vertebrae.
- FIG. 2 illustrates a perspective view of a spinal fixation device in accordance with a further embodiment of the present invention.
- the spinal fixation device of FIG. 2 is similar to the spinal fixation device of FIG. 1 except that the rod 4 comprises a flexible middle portion 8 juxtaposed between two rigid end portions 9 of the rod 4 .
- FIG. 3 provides an exploded view of the securing member 2 of FIGS. 1 and 2 illustrating various components of the coupling assembly 14 , in accordance with one embodiment of the invention.
- the coupling assembly 14 includes: a cylindrical head 16 located at a top end of the screw-type shaft 10 , a spiral thread or groove 18 formed along portions of the inner wall surface of the cylindrical head 16 , and a U-shaped seating groove 20 configured to receive the rod 4 therein.
- the coupling assembly 14 further comprises an outside-threaded nut 22 having a spiral thread 24 formed on the outside lateral surface of the nut 22 , wherein the spiral thread 24 is configured to mate with the internal spiral thread 18 of the cylindrical head 16 .
- the coupling assembly 14 includes a fixing cap 26 configured to be mounted over a portion of the cylindrical head 16 to cover and protect the outside-threaded nut 22 and more securely hold rod 4 within seating groove 20 .
- an inner diameter of the fixing gap 26 is configured to securely mate with the outer diameter of the cylindrical head 16 .
- Other methods of securing the fixing cap 26 to the cylindrical head, such as correspondingly located notches and groove (not shown), would be readily apparent to those of skill in the art.
- the components and parts of the securing member 2 may be made of highly rigid and durable bio-compatible materials such as: stainless steel, iron steel, titanium or titanium alloy. Such materials are known in the art.
- bio-compatible materials refers to those materials that will not cause any adverse chemical or immunological reactions after being implanted into a patient's body.
- the rod 4 is coupled to the securing means 2 by seating the rod 4 horizontally into the seating groove 20 of the coupling means 14 perpendicularly to the direction of the length of the threaded shaft 10 of securing member 2 .
- the outside threaded nut 22 is then received and screwed into the cylindrical head 16 above the rod 4 so as to secure the rod 4 in the seating groove 20 .
- the fixing cap 26 is then placed over the cylindrical head 16 to cover, protect and more firmly secure the components in the internal cavity of the cylindrical head 16 .
- FIGS. 4-7 illustrate perspective views of various embodiments of a rod 4 that may be used in a fixation device, in accordance with the present invention.
- FIG. 4 illustrates the rod 4 of FIG.
- rod 4 comprises a metal tube or pipe having a cylindrical wall 5 of a predefined thickness.
- the cylindrical wall 5 is cut in a spiral fashion along the length of the rod 4 to form spiral cuts or grooves 6 .
- the width and density of the spiral grooves 6 may be adjusted to provide a desired level of flexibility.
- the grooves 6 are formed from very thin spiral cuts or incisions that penetrate through the entire thickness of the cylindrical wall of the rod 4 .
- the thickness and material of the tubular walls 5 also affect the level of flexibility.
- the rod 4 is designed to have a flexibility that substantially equals that of a normal back. Flexibility ranges for a normal back are known by those skilled in the art, and one of ordinary skill can easily determine a thickness and material of the tubular walls 5 and a width and density of the grooves 6 to achieve a desired flexibility or flexibility range within the range for a normal back.
- the term “density” refers to tightness of the spiral grooves 6 or, in other words, the distance between adjacent groove lines 6 as shown in FIG. 4 , for example.
- the present invention is not limited to a particular, predefined flexibility range.
- the rigidity of the rod 4 should be able to endure a vertical axial load applied to the patient's spinal column along a vertical axis of the spine in a uniform manner with respect to the rest of the patient's natural spine.
- FIG. 5 illustrates the rod 4 of FIG. 2 wherein only a middle portion 8 is made and designed to be flexible and two end portions 9 are made to be rigid.
- metal end rings or caps 9 ′ having no grooves therein, may be placed over respective ends of the rod 4 of FIG. 4 so as make the end portions 9 rigid.
- the rings or caps 9 ′ may be permanently affixed to the ends of the rod 4 using known methods such as pressing and/or welding the metals together.
- the spiral groove 6 is only cut along the length of the middle portion 8 and the end portions 9 comprise the tubular wall 5 without grooves 6 . Without the grooves 6 , the tubular wall 5 , which is made of a rigid metal or metal hybrid material, exhibits high rigidity.
- FIG. 6 illustrates a further embodiment of the rod 4 having multiple sections, two flexible sections 8 interleaved between three rigid sections 9 .
- This embodiment may be used, for example, to stabilize three adjacent vertebrae with respect to each other, wherein three pedicle screws are fixed to a respective one of the vertebrae and the three rigid sections 9 are connected to a coupling assembly 14 of a respective pedicle screw 2 , as described above with respect to FIG. 3 .
- Each of the flexible sections 8 and rigid sections 9 may be made as described above with respect to FIG. 5 .
- FIG. 7 illustrates another embodiment of the rod 4 having a pre-bent structure and configuration to conform to and maintain a patient's curvature of the spine, known as “lordosis,” while stabilizing the spinal column.
- a patient's lumbar is in the shape of a ‘C’ form, and the structure of the rod 4 is formed to coincide to the normal lumbar shape when utilized in the spinal fixation device of FIG. 2 , in accordance with one embodiment of the invention.
- the pre-bent rod 4 includes a middle portion 8 that is made and designed to be flexible interposed between two rigid end portions 9 .
- the middle portion 8 and end portions 9 may be made as described above with respect to FIG. 5 .
- the pre-bent structure and design of the rod 4 may offset a skew angle when two adjacent pedicle screws are not inserted parallel to one another, as described in further detail below with respect to FIG. 23A .
- FIG. 8 illustrates a perspective, cross-sectional view of a flexible tubular rod 4 , or rod portion 8 in accordance with one embodiment of the invention.
- the flexible rod 4 , 8 is made from a first metal tube 5 having a spiral groove 6 cut therein as described above with respect to FIGS. 4-7 .
- a second tube 30 having spiral grooves 31 cut therein and having a smaller diameter than the first tube 5 is inserted into the cylindrical cavity of the first tube 5 .
- the second tube 30 has spiral grooves 31 which are cut in an opposite spiral direction with respect to the spiral grooves 6 cut in the first tube 5 , such that the rotational torsion characteristics of the second tube 30 offset at least some of the rotational torsion characteristics of the first tube 5 .
- the second flexible tube 30 is inserted into the core of the first tube to provide further durability and strength to the flexible rod 4 , 8 .
- the second tube 30 may be made of the same or different material than the first tube 5 .
- the material used to manufacture the first and second tubes 5 and 30 may be any one or combination of the following exemplary metals: stainless steel, iron steel, titanium, and titanium alloy.
- FIG. 9 illustrates a perspective, cross-sectional view of a flexible rod 4 , 8 in accordance with a further embodiment of the invention.
- the flexible rod 4 , 8 includes an inner core made of a metallic wire 32 comprising a plurality of overlapping thin metallic yarns, such as steel yarns, titanium yams, or titanium-alloy yarns.
- the wire 32 is encased by a metal, or metal hybrid, flexible tube 5 having spiral grooves 6 cut therein, as discussed above.
- the number and thickness of the metallic yarns in the wire 32 also affects the rigidity and flexibility of the rod 4 , 8 . By changing the number, thickness or material of the yarns flexibility can be increased or decreased.
- the number, thickness and/or material of the metallic yarns in the wire 32 can be adjusted to provide a desired rigidity and flexibility in accordance with a patient's particular needs.
- Those of ordinary skill in the art can easily determine the number, thickness and material of the yarns, in conjunction with a given flexibility of the tube 5 in order to achieve a desired rigidity v. flexibility profile for the rod 4 , 8 .
- FIG. 10 shows yet another embodiment of a flexible rod 4 wherein the flexible tube 5 encases a non-metallic, flexible core 34 .
- the core 34 may be made from known biocompatible shape memory alloys (e.g., NITINOL), or biocompatible synthetic materials such as: carbon fiber, Poly Ether Ether Ketone (PEEK), Poly Ether Ketone Ketone Ether Ketone (PEKKEK), or Ultra High Molecular Weight Poly Ethylene (UHMWPE).
- NITINOL known biocompatible shape memory alloys
- PEEK Poly Ether Ether Ketone
- PEKKEK Poly Ether Ketone Ketone Ether Ketone
- UHMWPE Ultra High Molecular Weight Poly Ethylene
- FIG. 11 illustrates a perspective view of another embodiment of the flexible rod 35 in which a plurality of metal wires 32 , as described above with respect to FIG. 9 , are interweaved or braided together to form a braided metal wire rod 35 .
- the braided metal wire rod 35 can be made from the same materials as the metal wire 32 .
- the rigidity and flexibility of the braided rod 35 can be further modified to achieve desired characteristics by varying the number and thickness of the wires 32 used in the braided structure 35 .
- each end of the braided metal wire rod 35 is encased by a rigid metal cap or ring 9 ′ as described above with respect to FIGS. 5-7 , to provide a rod 4 having a flexible middle portion 8 and rigid end portions 9 .
- the metal braided wire rod 35 may be utilized as a flexible inner core encased by a metal tube 5 having spiral grooves 6 cut therein to create a flexible metal rod 4 or rod portion 8 , in a similar fashion to the embodiments shown in FIGS. 8-10 .
- the term “braid” or “braided structure” encompasses two or more wires, strips, strands, ribbons and/or other shapes of material interwoven in an overlapping fashion. Various methods of interweaving wires, strips, strands, ribbons and/or other shapes of material are known in the art. Such interweaving techniques are encompassed by the present invention.
- the flexible metal rod 35 includes a braided metal structure having two or more metal strips, strands or ribbons interweaved in a diagonally overlapping pattern.
- FIG. 12A illustrates a further embodiment of a flexible connection unit 36 having two rigid end portions 9 ′ and an exemplary number of rigid spacers 37 .
- the rigid end portions 9 ′ and spacers can be made of bio-compatible metal or metal-hybrid materials as discussed above.
- the connection unit 36 further includes a flexible wire 32 , as discussed above with respect to FIG. 9 ′, which traverses an axial cavity or hole (not shown) in each of the rigid end portions 9 ′ and spacers 37 .
- FIG. 12B illustrates an exploded view of the connection unit 36 that further shows how the wire 32 is inserted through center axis holes of the rigid end portions 9 ′ and spacers 37 . As further shown in FIG.
- each of the end portions 9 ′ and spacers 37 include a male interlocking member 38 which is configured to mate with a female interlocking cavity (not shown) in the immediately adjacent end portion 9 ′ or spacer 37 .
- FIG. 12C illustrates an exploded side view and indicates with dashed lines the location and configuration of the female interlocking cavity 39 for receiving corresponding male interlocking members 38 .
- FIG. 13 shows a perspective view of a flexible connection unit 40 in accordance with another embodiment of the invention.
- the connection 40 is similar to the connection unit 36 described above, however, the spacers 42 are configured to have the same shape and design as the rigid end portions 9 ′. Additionally, the end portions 9 ′ have an exit hole or groove 44 located on a lateral side surface through which the wire 32 may exit, be pulled taut, and clamped or secured using a metal clip (not shown) or other known techniques. In this way, the length of the flexible connection unit 36 or 40 may be varied at the time of surgery to fit each patient's unique anatomical characteristics.
- the wire 32 may be secured using a metallic clip or stopper (not shown).
- a clip or stopper may include a small tubular cylinder having an inner diameter that is slightly larger than the diameter of the wire 32 to allow the wire 32 to pass therethrough. After the wire 32 is pulled to a desired tension through the tubular stopper, the stopper is compressed so as to pinch the wire 32 contained therein.
- the wire 32 may be pre-secured using known techniques during the manufacture of the connection units 36 , 40 having a predetermined number of spacers 37 , 42 therein.
- FIG. 14 depicts a spinal fixation device according to another embodiment of the present invention.
- the spinal fixation device includes: at least two securing members 2 containing an elongate screw type shaft 10 having an external spiral thread 12 , and a coupling assembly 14 .
- the device further includes a plate connection unit 50 , or simply “plate 50 ,” configured to be securely connected to the coupling parts 14 of the two securing members 2 .
- the plate 50 comprises two rigid connection members 51 each having a planar surface and joined to each other by a flexible middle portion 8 .
- the flexible middle portion 8 may be made in accordance with any of the embodiments described above with respect to FIGS. 4-11 .
- Each connection member 51 contains a coupling hole 52 configured to receive therethrough a second threaded shaft 54 ( FIG. 15 ) of the coupling assembly 14 .
- the coupling assembly 14 of the securing member 2 includes a bolt head 56 adjoining the top of the first threaded shaft 10 and having a circumference or diameter greater than the circumference of the first threaded shaft 10 .
- the second threaded shaft 54 extends upwardly from the bolt head 56 .
- the coupling assembly 14 further includes a nut 58 having an internal screw thread configured to mate with the second threaded shaft 54 , and one or more washers 60 , for clamping the connection member 51 against the top surface of the bolt head 56 , thereby securely attaching the plate 50 to the pedicle screw 2 .
- FIGS. 16A and 16B illustrate two embodiments of a plate connection unit 40 having at least two coupling members 51 and at least one flexible portion 8 interposed between and attached to two adjacent connection members 51 .
- the flexible middle portion 8 comprises a flexible metal braided wire structure 36 as described above with respect to FIG. 11 .
- the flexible portion 8 can be designed and manufactured in accordance with any of the embodiments described above with respect to FIGS. 4-11 , or combinations thereof.
- FIGS. 16C and 16D illustrate a side view and top view, respectively, of the plate 50 of FIG. 16A .
- the manufacture of different embodiments of the flexible connection units 50 and 58 having different types of flexible middle portions 8 is easily accomplished using known metallurgical, organic polymer, natural resin, or composite materials, and compatible manufacturing and machining processes.
- FIG. 16E illustrate a side view of a pre-bent plate connection unit 50 ′, in accordance with a further embodiment of the invention.
- This plate connection unit 50 ′ is similar to the plate 50 except that connection members 51 ′ are formed or bent at an angle ⁇ from a parallel plane 53 during manufacture of the plate connection unit 50 ′.
- this pre-bent configuration is designed to emulate and support a natural curvature of the spine (e.g., lordosis). Additionally, or alternatively, this pre-bent structure may offset a skew angle when two adjacent pedicle screws are not inserted parallel to one another, as described in further detail below with respect to FIG. 23A .
- FIG. 17 illustrates a perspective view of a plate connection unit 60 having two planar connection members 62 each having a coupling hole 64 therein for receiving the second threaded shaft 44 of the pedicle screw 2 .
- a flexible middle portion 8 is interposed between the two connection members 62 and attached thereto.
- the flexible middle portion 8 is made in a similar fashion to wire 32 described above with respect to FIG. 9 , except it has a rectangular configuration instead of a cylindrical or circular configuration as shown in FIG. 9 . It is understood, however, that the flexible middle portion 8 may be made in accordance with the design and materials of any of the embodiments previously discussed.
- FIG. 18 illustrates a perspective view of a further embodiment of the plate 60 of FIG. 17 wherein the coupling hole 64 includes one or more nut guide grooves 66 cut into the top portion of the connection member 62 to seat and fix the nut 58 ( FIG. 15 ) into the coupling hole 64 .
- the nut guide groove 66 is configured to receive and hold at least a portion of the nut 58 therein and prevent lateral sliding of the nut 58 within the coupling hole 64 after the connection member 62 has been clamped to the bolt head 56 of the pedicle screw 2 .
- FIG. 19 illustrates a perspective view of a hybrid plate and rod connection unit 70 having a rigid rod-like connection member 4 , 9 or 9 ′, as described above with respect to FIGS. 4-7 , at one end of the connection unit 70 and a plate-like connection member 51 or 62 , as described above with respect to FIGS. 14-18 , at the other end of the connection unit 70 .
- a flexible member 8 interposed between rod-like connection member 9 ( 9 ′) and the plate-like connection member 52 ( 64 ) is a flexible member 8 .
- the flexible member 8 may be designed and manufactured in accordance with any of the embodiments discussed above with reference to FIGS. 8-13 .
- FIG. 20 illustrates a perspective view of a spinal fixation device that utilizes the hybrid plate and rod connection unit 70 of FIG. 19 .
- this fixation device utilizes two types of securing members 2 (e.g., pedicle screws), the first securing member 2 ′ being configured to securely hold the plate connection member 42 ( 64 ) as described above with respect to FIG. 15 , and the second securing member 2 ′′ being configured to securely hold the rod connection member 4 , 9 or 9 ′, as described above with respect to FIG. 3 .
- securing members 2 e.g., pedicle screws
- FIG. 21 illustrates a perspective top view of two spinal fixation devices, in accordance with the embodiment illustrated in FIG. 1 , after they are attached to two adjacent vertebrae 80 and 82 to flexibly stabilize the vertebrae.
- FIGS. 22A and 22B illustrate perspective top views of spinal fixation devices using the flexible stabilizing members 50 and 58 of FIGS. 16A and 16B , respectively, after they are attached to two or more adjacent vertebrae of the spine.
- FIG. 23A illustrates a side view of a spinal fixation device after it has been implanted into the pedicles of two adjacent vertebrae.
- the pedicle screws 2 are mounted into the pedicle bone such that a center axis 80 of the screws 2 are offset by an angle ⁇ from a parallel plane 82 and the center axes 80 of the two screws 2 are offset by an angle of approximately 2 ⁇ from each other.
- This type of non-parallel insertion of the pedicle screws 2 often results due to the limited amount of space that is available when performing minimally invasive surgery.
- the pedicle screws 2 may have a tendency to be skewed from parallel due to a patient's natural curvature of the spine (e.g., lordosis). Thus, due to the non-parallel nature of how the pedicle screws 2 are ultimately fixed to the spinal pedicle, it is desirable to offset this skew when attaching a rod or plate connection unit to each of the pedicle screws 2 .
- FIG. 23B illustrates a side view of the head of the pedicle screw in accordance with one embodiment of the invention.
- the screw 2 includes a cylindrical head 84 which is similar to the cylindrical head 16 described above with respect to FIG. 3 except that the cylindrical head 84 includes a slanted seat 86 configured to receive and hold a flexible rod 4 in a slanted orientation that offsets the slant or skew 0 of the pedicle screw 2 as described above.
- the improved pedicle screw 2 further includes a slanted stabilizing spacer 88 which is configured to securely fit inside the cavity of the cylindrical head 84 and hold down the rod 4 at the same slant as the slanted seat 86 .
- the pedicle screw 2 further includes an outside threaded nut 22 configured to mate with spiral threads along the interior surface (not shown) of the cylindrical head 84 for clamping down and securing the slanted spacer 88 and the rod 4 to the slanted seat 86 and, hence, to the cylindrical head 84 of the pedicle screw 2 .
- FIG. 23C shows a perspective view of the slanted spacer 88 , in accordance with embodiment of the invention.
- the spacer 88 includes a circular middle portion 90 and two rectangular-shaped end portions 92 extending outwardly from opposite sides of the circular middle portion 90 .
- FIG. 23D shows a side view of the spacer 88 that further illustrates the slant from one end to another to compensate or offset the skew angle ⁇ of the pedicle screw 2 .
- FIG. 23E illustrates a top view of the cylindrical head 84 configured to receive a rod 4 and slanted spacer 88 therein.
- the rod 4 is received through two openings or slots 94 in the cylindrical walls of the cylindrical head 84 , which allow the rod 4 to enter the circular or cylindrical cavity 96 of the cylindrical head 84 and rest on top of the slanted seat 86 formed within the circular or cylindrical cavity 94 .
- the slanted stabilizing spacer 88 is received in the cavity 96 such that the two rectangular-shaped end portions 92 are received within the two slots 94 , thereby preventing lateral rotation of the spacer 88 within the cylindrical cavity 96 .
- the outside threaded nut 22 and fixing cap 26 are inserted on top of the slanted spacer 88 to securely hold the spacer 88 and rod 4 within the cylindrical head 84 .
- FIG. 24 illustrates a perspective view of a marking and guidance device 100 for marking a desired location on the spinal pedicle where a pedicle screw 2 will be inserted and guiding the pedicle screw 2 to the marked location using a minimally invasive surgical technique.
- the marking device 100 includes a tubular hollow guider 52 which receives within its hollow an inner trocar 104 having a sharp tip 105 at one end that penetrates a patient's muscle and tissue to reach the spinal pedicle.
- the inner trocar 104 further includes a trocar grip 106 at the other end for easy insertion and removal of the trocar 104 .
- the marking and guidance device 100 includes a guider handle 108 to allow for easier handling of the device 100 .
- the trocar 104 is in the form of a long tube or cylinder having a diameter smaller than the inner diameter of the hollow of the guider 102 so as to be inserted into the hollow of the tubular guider 102 .
- the trocar 104 further includes a sharp or pointed tip 105 for penetrating the vertebral body through the pedicle.
- the trocar 104 further includes a trocar grip 106 having a diameter larger than the diameter of the hollow of the guider tube 102 in order to stop the trocar 104 from sliding completely through the hollow.
- the trocar grip 106 also allows for easier handling of the trocar 104 .
- FIGS. 26A and 26B provide perspective views of the marking and guidance device 100 after it has been inserted into a patient's back and pushed through the muscle and soft tissue to reach a desired location on the spinal pedicle.
- the desired location is determined using known techniques such as x-ray or radiographic imaging for a relatively short duration of time.
- prolonged exposure of the patient to x-ray radiation is unnecessary.
- the inner trocar 104 is removed to allow fiducial pins (not shown) to be inserted into the hollow of the guidance tube 102 and thereafter be fixed into the pedicle.
- FIGS. 27A and 27B illustrate perspective views of two embodiments of the fiducial pins 110 and 112 , respectively.
- the fiducial pins 110 and 112 according to the present invention are inserted and fixed into the spinal pedicle after passing through the hollow guider 102 .
- the pins 110 and 112 have a cylindrical shape with a diameter smaller than the inner diameter of the hollow of the guider tube 102 in order to pass through the hollow of the guider 102 .
- An end of each fiducial pin is a sharp point 111 configured to be easily inserted and fixed into the spinal pedicle of the spinal column. In one embodiment, as shown in FIG.
- the other end of the fiducial pin incorporates a threaded shaft 114 which is configured to mate with an internally threaded tube of a retriever (not shown) for extraction of the pin 112 .
- This retriever is described in further detail below with respect to FIG. 32 .
- the fiducial pins 110 , 112 are preferably made of a durable and rigid biocompatible metal (e.g., stainless steel, iron steel, titanium, titanium alloy) for easy insertion into the pedicle bone.
- a durable and rigid biocompatible metal e.g., stainless steel, iron steel, titanium, titanium alloy
- the fiducial pins 110 , 112 are easily driven into the spinal pedicle without risk of bending or structural failure.
- the process of driving in prior art guidance wires was often very difficult and time-consuming.
- the insertion of the fiducial pins 110 , 112 into the entry point on the spinal pedicle is much easier and convenient for the surgeon and, furthermore, does not hinder subsequent procedures due to a guide wire protruding out of the patient's back.
- FIG. 28 shows a cylindrical pushing trocar 116 having a cylindrical head 118 of larger diameter than the body of the pushing trocar 116 .
- the pushing trocar 116 is inserted into the hollow of the guider 102 after the fiducial pin 110 or 112 has been inserted into the hollow of the guider 102 to drive and fix the fiducial pin 110 or 112 into the spinal pedicle.
- a doctor strikes the trocar head 118 with a chisel or a hammer to drive the fiducial pin 110 and 112 into the spinal pedicle.
- the pushing trocar 116 is in the form of a cylindrical tube, which has a diameter smaller than the inner diameter of the hollow of the guider tube 112 .
- the pushing trocar 116 also includes a cylindrical head 118 having a diameter larger than the diameter of the pushing trocar 116 to allow the doctor to strike it with a chisel or hammer with greater ease.
- a hammer or chisel is not necessarily required.
- a surgeon may choose to push or tap the head 118 of the pushing trocar 116 with the palm of his or her hand or other object.
- FIG. 29A illustrates how a hammer or mallet 120 and the pushing trocar 116 may be used to drive the pin 110 , 112 through the hollow of the guider tube 102 and into the designated location of the spinal pedicle.
- FIG. 29B illustrates a perspective cross-sectional view of the spinal column after two fiducial pins 110 , 112 have been driven and fixed into two adjacent vertebrae.
- a larger hole or area centered around each pin 110 , 112 is created to allow easer insertion and mounting of a pedicle screw 2 into the pedicle bone.
- the larger hole is created using a cannulated awl 122 as shown in FIG. 30 .
- the cannulated awl 122 is inserted over the fiducial pin 110 , 112 fixed at the desired position of the spinal pedicle.
- the awl 122 is in the form of a cylindrical hollow tube wherein an internal diameter of the hollow is larger than the outer diameter of the fiducial pins 110 and 112 so that the pins 110 , 112 may be inserted into the hollow of the awl 122 .
- the awl 122 further includes one or more sharp teeth 124 at a first end for cutting and grinding tissue and bone so as to create the larger entry point centered around the fiducial pin 110 , 112 so that the pedicle screw 2 may be more easily implanted into the spinal pedicle.
- FIG. 31 illustrates a perspective cross-sectional view of a patient's spinal column when the cannulated awl 122 is inserted into a minimally invasive incision in the patient's back, over a fiducial pin 110 , 112 to create a larger insertion hole for a pedicle screw 2 (not shown).
- a retractor 130 has been inserted into the minimally invasive incision over the surgical area and a lower tubular body of the retractor 130 is expanded to outwardly push surrounding tissue away from the surgical area and provide more space and a visual field for the surgeon to operate.
- the minimally invasive incision is made in the patient's back between and connecting the two entry points of the guide tube 102 used to insert the two fiducial pins 110 , 112 .
- prior expansion of the minimally invasive incision is typically required using a series of step dilators (not shown), each subsequent dilator having a larger diameter than the previous dilator.
- the retractor 130 is inserted with its lower tubular body in a retracted, non-expanded state. After the retractor 130 is pushed toward the spinal pedicle to a desired depth, the lower tubular portion is then expanded as shown in FIG. 31 .
- step dilators and retractors are well known in the art.
- the fiducial pin 110 , 112 is removed.
- a retrieving device 140 may be used to remove the fiducial pin 112 before implantation of a pedicle screw 2 .
- the retriever 140 comprises a long tubular or cylindrical portion having an internally threaded end 142 configured to mate with the externally threaded top portion 114 of the fiducial pin 112 .
- a doctor my pull the fiducial pin 112 out of the spinal pedicle.
- appropriate tools e.g., specially designed needle nose pliers
- the fiducial pins 110 , 112 are not extracted from the spinal pedicle. Instead, a specially designed pedicle screw 144 may be inserted into the spinal pedicle over the pin 110 , 112 without prior removal of the pin 110 , 112 .
- the specially designed pedicle screw 144 includes an externally threaded shaft 10 and a coupling assembly 14 ( FIG. 3 ) that includes a cylindrical head 16 ( FIG. 3 ) for receiving a flexible rod-shaped connection unit 4 ( FIGS. 4-13 ).
- the coupling assembly 14 may be configured to receive a plate-like connection unit as shown in FIGS. 14-20 .
- the pedicle screw 144 further includes a longitudinal axial channel (not shown) inside the threaded shaft 10 having an opening 146 at the tip of the shaft 10 and configured to receive the fiducial pin 110 , 112 therein.
- FIG. 34 illustrates a perspective cross-sectional view of the patient's spinal column after a pedicle screw 2 has been inserted into a first pedicle of the spine using an insertion device 150 .
- Various types of insertion devices 150 known in the art may be used to insert the pedicle screw 2 .
- the retractor 130 is adjusted and moved slightly to provide space and a visual field for insertion of a second pedicle screw at the location of the second fiducial pin 110 , 112 .
- FIG. 35 provides a perspective, cross sectional view of the patient's spinal column after two pedicle screws 2 have been implanted in two respective adjacent pedicles of the spine, in accordance with the present invention.
- a flexible rod, plate or hybrid connection unit as described above with respect to FIGS. 4-20 may be connected to the pedicle screws to provide flexible stabilization of the spine.
- the retractor 130 is removed and the minimally invasive incision is closed and/or stitched.
- FIG. 36A illustrates a perspective view of a flexible rod 200 for spinal fixation, in accordance with a further embodiment of the invention.
- the rod 200 is configured to be secured by securing members 2 as described above with reference to FIGS. 1-3 .
- the rod 200 , and rods 210 , 220 , 230 and 240 described below are comprised of a solid, cylindrically-shaped rod made of known bio-compatible materials such as: stainless steel, iron steel, titanium, titanium alloy, NITINOL, and other suitable metal compositions or materials.
- spiral grooves 202 are cut or formed along at least a portion of the length of the cylindrical body of the rod 200 .
- the length of the rod “l” may be between 4 and 8 centimeters (cm), and its cylindrical diameter “D” is between 4-8 millimeters (mm).
- the spiral grooves 202 have a width “w” between 0.1 and 0.5 mm and a spiral angle ⁇ between 50 and 85 degrees from horizontal.
- the distance between spiral grooves 202 can be between 3 and 6 mm.
- the above dimensions are exemplary only and may be varied to achieve desired flexibility, torsion and strength characteristics that are suitable for a particular patient or application.
- FIG. 36B illustrates a cross-sectional view of the flexible rod 200 , taken along lines B-B of FIG. 36A .
- spiral groove 202 is cut toward the center longitudinal axis of the cylindrical rod 200 .
- the groove may be formed continuously in a spiral fashion, as a helix or an interrupted helix for a solid or hollow rod, or are as disconnected circumferential grooves for a solid rod. If hollow rods have disconnected circumferential grooves formed in them, the grooves can only partially penetrate the rod material to avoid discontinuities.
- the depth of the groove 202 is approximately equal to the cylindrical radius of the rod 200 , as shown in FIG. 36B , and penetrates as deep as the center longitudinal axis of the cylindrical rod 200 .
- the cross sectional area and shape of the rod, groove depth, groove width, groove cross-section shape, and groove to groove spacing of the grooved portion of the longitudinal member can be varied to adjust mechanical and structural characteristics as desired. For example, deepening or widening grooves increases flexibility, while increasing groove-to-groove spacing decreases flexibility. This can be used to modify extent of rod bending at a fixed bending force, custom tailor the bent shape of the rod, and equalize mechanical stresses in the rod during bending in order to minimize material fatigue and improve rod reliability.
- FIG. 37A illustrates a flexible rod 210 for spinal fixation in accordance with another embodiment of the invention.
- the rod 210 includes a plurality of transverse holes or tunnels 212 drilled or formed within the body of the rod 210 .
- the tunnels 212 pass through a center longitudinal axis of the cylindrical rod 210 at an angle ⁇ from horizontal.
- the openings for each respective tunnel 212 are located on opposite sides of the cylindrical wall of the rod 210 and adjacent tunnels 212 share a common opening on one side of the cylindrical wall, forming a zigzag pattern of interior tunnels 212 passing transversely through the central longitudinal axis of the rod 210 , as shown in FIG. 37A .
- the diameter D of each tunnel 212 may be varied between 0.2 to 3 mm, depending the desired mechanical and structural characteristics (e.g., flexibility, torsion and strength) of the rod 210 .
- desired mechanical and structural characteristics e.g., flexibility, torsion and strength
- these dimensions are exemplary and other diameters D may be desired depending on the materials used and the desired structural and mechanical characteristics.
- the angle from horizontal ⁇ may be varied to change the number of tunnels 212 or the distance between adjacent tunnels 212 .
- FIG. 37B illustrates a cross-sectional view of the flexible rod 210 taken along lines B-B of FIG. 37A .
- the tunnel 212 cuts through the center cylindrical axis of the rod 210 such that openings of the tunnel 212 are formed at opposite sides of the cylindrical wall of the rod 210 .
- FIG. 38A illustrates a perspective view of a flexible rod 220 for spinal fixation, in accordance with a further embodiment of the invention.
- Rod 220 incorporates the spiral grooves 202 described above with reference to FIGS. 36A and 36B as well as the transverse tunnels 212 described above with respect to FIGS. 37A and 37B .
- the spiral grooves 202 are cut into the surface of the cylindrical wall of the rod 220 toward a center longitudinal axis of the rod 220 .
- the dimensions of the spiral grooves 202 and their angle from horizontal ⁇ may be varied in accordance with desired mechanical and structural characteristics.
- the dimensions of the transverse tunnels 212 and their angle from horizontal ⁇ FIG.
- angles ⁇ and ⁇ are substantially similar such that the openings of the tunnels 212 substantially coincide with the spiral grooves 202 on opposite sides of the cylindrical wall of the rod 220 .
- FIG. 38B shows a top view of the flexible rod 220 taken along the perspective indicated by lines B-B of FIG. 38A .
- the openings of the tunnels 212 coincide with the spiral grooves 202 .
- FIG. 39A illustrates a flexible rod 230 for spinal fixation, in accordance with another embodiment of the invention.
- the rod 230 includes a plurality of transverse tunnels 232 formed in the body of the rod 230 .
- the tunnels 232 are substantially similar to the tunnels 212 described above with respect to FIGS. 37A and 37B , however, the tunnels 232 are not linked together in a zigzag pattern. Rather, each tunnel 232 is substantially parallel to its immediate adjacent tunnels 232 and the openings of one tunnel 232 do not coincide with the openings of adjacent tunnels 232 .
- the angle from horizontal ⁇ in this embodiment is approximately 90 degrees. However, it is understood that other angles ⁇ may be incorporated in accordance with the present invention.
- tunnels 232 may be varied to achieve desired mechanical and structural characteristics.
- the cross-sectional shape of the tunnels 212 and 232 need not be circular. Instead, for example, they may be an oval or diamond shape, or other desired shape.
- FIG. 39B illustrates a cross-sectional view of the rod 230 taken along lines B-B of FIG. 39A .
- the transverse tunnel 232 travels vertically and transversely through the center longitudinal axis of the rod 230 .
- FIG. 39C illustrates a cross-sectional view of a further embodiment of the rod 230 , wherein an additional transverse tunnel 232 ′ is formed substantially orthogonal to the first transverse tunnel 232 and intersect the first transverse tunnel 232 at the center, cylindrical axis point. In this way, further flexibility of the rod 230 may be provided as desired.
- FIG. 40A illustrates a perspective view of a flexible rod 240 , in accordance with a further embodiment of the invention.
- the rod 240 includes a plurality of interleaved transverse tunnels 232 and 242 which are substantially orthogonal to each other and which do not intersect, as shown in FIG. 40A .
- adjacent tunnels 232 and 242 need not be orthogonal to one another.
- Each tunnel 232 , 242 can be offset at a desired angle co from its immediately preceding adjacent tunnel 232 , 242 .
- FIG. 41A An embodiment of a longitudinal member to accomplish this function is shown in FIG. 41A .
- Axial portion 254 of longitudinal member 250 is grooved to provide increased flexibility for bending, whereas axial portions 252 and 256 are not grooved and remain relatively rigid.
- the hole 258 is used to terminate the groove to prevent the formation of cracks and improve reliability.
- the use of such holes of expanded diameter to terminate grooves or slots in materials is well known in the art as a means of reducing peak mechanical stresses in materials and reducing the likelihood of material failure.
- FIG. 41B illustrates the assembly of the rod 250 of FIG. 41A configured to be secured to a patient's spine using at least three securing members 2 ( FIG. 3 ) having a flexible section 254 disposed between a first pair of securing members 2 and a non-flexible section 252 disposed between a second pair for securing members 2 .
- an extended ungrooved section 252 can accommodate a range of positions for a single securing member 2 to be placed.
- extended ungrooved sections can be symmetrically disposed at either end of a grooved section. It is appreciated that the extended length of section 252 provides a “one size fits all” longitudinal member 250 that can accommodate various distances between the pedicle bones of adjacent vertebrae. As shown in FIG. 41C , the distance between the adjacent securing members, 2 and 2 ′, may be adjusted by selecting the location of the securing member 2 on section 252 . Any excess length of section 252 can then be trimmed away or removed.
- Groove parameters such as groove depth, groove width, groove cross-section shape or profile, and groove to groove spacing of the grooved portion 254 can be uniformly constant for uniform structural and mechanical characteristics along the axis of the grooved portion 254 .
- the cross-sectional area of a cylindrical (for example) hollow longitudinal member can be changed by changing the outer diameter, while maintaining constant wall thickness for the hollow cylinder.
- Another embodiment is to modify the wall thickness by adjusting the internal diameter (i.e. the diameter of the cavity within the cylinder) while keeping the outer diameter of the hollow cylinder constant.
- Still other embodiments simultaneously vary the external diameter and the internal diameter. It is easily seen how the above arguments also apply to longitudinal members with shapes that are not cylindrical.
- FIG. 42A illustrates a side view of a flexible, spirally grooved stabilization device 270 in accordance with an embodiment of the invention.
- the spirally grooved section 271 has an expanded outer diameter relative to ungrooved sections 262 and 262 ′. Whereas the spiral groove imparts increased flexibility to section 271 , it would also impart greater per unit area material strain to section 271 relative to ungrooved sections 262 and 262 ′ because of reduced cross-sectional material area in section 271 , due to the presence of the grooves, if the outer diameter of spirally grooved section 271 were the same as the outer diameter of the ungrooved sections 262 and 262 ′. Expanding the outer diameter of section 271 can maintain acceptable material stress levels during the flexing of the spirally grooved section 271 for both the spirally grooved section 271 , and the ungrooved sections 262 and 262 ′.
- the inner diameter of the cavity of the spirally grooved section 271 can be the same as the inner diameter of the cavity of the ungrooved sections 262 and 262 ′, whereas the outer diameter of the grooved flexible section 271 is increased to reduce material stresses during bending and/or vary the flexibility of the grooved section 271 .
- FIGS. 42A and 42B illustrate examples of a longitudinal spinal stabilization device wherein a flexible section has a different cross-sectional profile (e.g., outer diameter (in the case of a cylindrical rod) or perimetric shape) than that of corresponding end portions of the longitudinal stabilization device.
- a flexible section has a different cross-sectional profile (e.g., outer diameter (in the case of a cylindrical rod) or perimetric shape) than that of corresponding end portions of the longitudinal stabilization device.
- the cross-sectional profile (e.g., outer diameter) of the grooved flexible section is kept the same as the cross-sectional profile (e.g., outer diameter) of the ungrooved sections, whereas the inner diameter of the cavity of the grooved flexible section is reduced relative to the inner diameters of the cavities of the ungrooved sections.
- both inner and outer diameters of the grooved flexible section can be varied with respect to the inner and outer diameters of the ungrooved sections to reduce material strain differences between the sections.
- FIG. 42B illustrates a side view of another embodiment of the present invention that accomplishes variation in flexibility along a longitudinal axis by adjusting the cylindrical diameter or cross-sectional profile of the grooved section 266 (while maintaining a constant inner cavity diameter for the case of a hollow longitudinal member) in order to achieve reduced mechanical stresses in the vicinity of transition sections 264 and 264 ′, between the grooved section 266 and ungrooved sections 262 and 262 ′, respectively.
- the outer diameter of the grooved section 266 is smallest near a central portion of the grooved section 266 and gradually expands toward the ungrooved sections 262 . This provides more cross-sectional material area to distribute forces through, thereby reducing per unit area stress in the regions of the grooved section 266 near the transition sections 264 and 264 ′.
- axial variations of groove depth, groove width, groove cross-section shape, and groove to groove spacing can also achieve axially variant flexibility and mechanical characteristics, either alone or in combination with variance of the cylindrical cross-section as discussed above. For example: (i) tapering the groove depth from a maximum near the center of a grooved section to near zero at a boundary with a non grooved section ( FIG. 43A ); (ii) tapering the groove width from a maximum near the center of a grooved section to near zero at a boundary with a non grooved section ( FIG. 43B ); (iii) transitioning groove shape from one permitting maximum flexure near the center of a grooved section to a shape providing reduced flexure at a boundary with a non grooved section ( FIG. 43C ); or (iv) expanding groove to groove spacing from a minimum near the center of a grooved section to a maximum at a boundary with a non grooved section ( FIG. 43D ).
- FIG. 44 illustrates a longitudinal member with an elastomer cladding 278 around the grooved section 276 .
- elastomer cladding 278 covers only grooved section 276 and does not cover ungrooved sections 272 .
- optional tapers 274 are formed in the longitudinal member to provide for a smooth surface transition between clad and unclad sections. These optional tapers 274 also fixate the longitudinal position of the cladding. Alternately the cladding may be extended onto an ungrooved section 272 .
- the elastomer cladding may (i) contact only the surface of the longitudinal member, (2) additionally penetrate into the groves of the longitudinal member, or (3) if the longitudinal member is hollow, additionally penetrate to and at least partially fill the inside of the longitudinal member.
- the elastomer cladding provides additional control over the axial and flexural stability of the longitudinal member, as well as providing a barrier between tissues and the grooved section.
- the elastomer cladding can consist of any of a variety of medical grade elastomers, including, for example, silicone, polyurethane, polycarbonateurethane and silicone-urethane copolymers.
- the cladding can be applied to the longitudinal member using a variety of techniques that are well known in the art.
- a thermoplastic or thermosetting resin can be injected into a heated mold surrounding the desired section of the longitudinal member, while it is affixed within a mold.
- An advantage of this injection molding process is that it can accommodate cladding material that are not of sufficiently low viscosity for application by alternate means at room temperature and pressure.
- a further advantage of injection molding is that the shape of the exterior of the cladding is determined by the shape of the mold that is used.
- Another injection molding advantage is the reproducible penetration of groove interstices and the interior of hollow longitudinal members.
- Alternative molding techniques include compression molding and transfer molding,
- cladding application methods include liquid injection molding, dipping, spraying, or painting with a mechanical applicator such as a paintbrush. These methods require that the cladding material be applied in a low viscosity form.
- a resin for application could be suspended in a solvent that evaporates after application.
- the cladding material is applied in a low viscosity form and subsequently cured through chemical, heat, or radiation methods. It is sometime useful to mask parts of the longitudinal member where application of the cladding material is not desired.
- FIG. 45A illustrates a uniform cross-section of a rod as the flexible section of a longitudinal member made of a material 277 .
- FIG. 44B illustrates a non-uniform cross-section of a rod as a flexible section of a longitudinal member made of a material 277 , that includes a section made of another material 279 .
- the rod of FIG. 45A will exhibit the same bending behavior with applied force in both the x and y directions. If the materials of sections 320 and 330 have different bending characteristics, the rod of FIG. 45B will exhibit different bending behavior with applied force for the x and y directions. For example, if material 279 in FIG. 45B is stiffer than material 277 , the rod will bend more easily in the x direction than in the y direction.
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US11/072,886 US7326210B2 (en) | 2003-09-24 | 2005-03-03 | Spinal stabilization device |
EP05853316A EP1827265A4 (en) | 2003-09-24 | 2005-12-09 | VERTEBRAL STABILIZATION DEVICE |
CA002591277A CA2591277A1 (en) | 2003-09-24 | 2005-12-09 | Spinal stabilization device |
PCT/US2005/044372 WO2006063107A2 (en) | 2003-09-24 | 2005-12-09 | Spinal stabilization device |
JP2007545612A JP2008522748A (ja) | 2003-09-24 | 2005-12-09 | 脊椎安定化装置 |
EP06736583.3A EP1858424B1 (en) | 2003-09-24 | 2006-03-01 | Spinal stabilization device |
PCT/US2006/007289 WO2006096414A1 (en) | 2003-09-24 | 2006-03-01 | Spinal stabilization device |
AU2006220929A AU2006220929A1 (en) | 2003-09-24 | 2006-03-01 | Spinal stabilization device |
JP2007558182A JP5014164B2 (ja) | 2003-09-24 | 2006-03-01 | 脊椎固定デバイス |
CA2600672A CA2600672C (en) | 2003-09-24 | 2006-03-01 | Spinal stabilization device |
CN200680015437A CN100586388C (zh) | 2003-09-24 | 2006-03-01 | 脊柱稳定装置 |
US11/705,955 US7988710B2 (en) | 2003-09-24 | 2007-02-13 | Spinal stabilization device |
US11/705,953 US8979900B2 (en) | 2003-09-24 | 2007-02-13 | Spinal stabilization device |
US11/705,950 US20070225710A1 (en) | 2003-09-24 | 2007-02-13 | Spinal stabilization device |
IL185648A IL185648A0 (en) | 2003-09-24 | 2007-09-02 | Spinal stabilization device |
ZA200904538A ZA200904538B (en) | 2003-09-24 | 2008-02-12 | Spinal stabilization device |
CN2008800049275A CN101636118B (zh) | 2003-09-24 | 2008-02-12 | 脊骨稳定装置 |
CA002675782A CA2675782A1 (en) | 2003-09-24 | 2008-02-12 | Spinal stabilization device |
JP2009549302A JP2010517708A (ja) | 2003-09-24 | 2008-02-12 | 脊椎安定具 |
KR1020097016649A KR20090119847A (ko) | 2003-09-24 | 2008-02-12 | 척추 안정화 장치 |
EP08729667A EP2111171A1 (en) | 2003-09-24 | 2008-02-12 | Spinal stabilization device |
CN2011101970783A CN102283704A (zh) | 2003-09-24 | 2008-02-12 | 脊骨稳定装置 |
AU2008216286A AU2008216286A1 (en) | 2003-09-24 | 2008-02-12 | Spinal Stabilization Device |
PCT/US2008/053734 WO2008100944A1 (en) | 2003-09-24 | 2008-02-12 | Spinal stabilization device |
CO09081647A CO6210796A2 (es) | 2003-09-24 | 2009-08-05 | Dispositivo de estabilizacion de la columna vertebral |
US13/163,217 US8623057B2 (en) | 2003-09-24 | 2011-06-17 | Spinal stabilization device |
JP2012019642A JP2012110737A (ja) | 2003-09-24 | 2012-02-01 | 脊椎安定化装置 |
US13/450,825 US20120209330A1 (en) | 2003-09-24 | 2012-04-19 | Spinal Stabilization Device |
US14/100,289 US20140094852A1 (en) | 2003-09-24 | 2013-12-09 | Spinal Stabilization Device |
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
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KR20030066108 | 2003-09-24 | ||
US10/728,566 US20050065516A1 (en) | 2003-09-24 | 2003-12-05 | Method and apparatus for flexible fixation of a spine |
US10/798,014 US7763052B2 (en) | 2003-12-05 | 2004-03-10 | Method and apparatus for flexible fixation of a spine |
US11/009,097 US20050203513A1 (en) | 2003-09-24 | 2004-12-10 | Spinal stabilization device |
US11/072,886 US7326210B2 (en) | 2003-09-24 | 2005-03-03 | Spinal stabilization device |
US11/705,950 US20070225710A1 (en) | 2003-09-24 | 2007-02-13 | Spinal stabilization device |
US11/705,955 US7988710B2 (en) | 2003-09-24 | 2007-02-13 | Spinal stabilization device |
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US10/798,014 Continuation-In-Part US7763052B2 (en) | 2003-09-24 | 2004-03-10 | Method and apparatus for flexible fixation of a spine |
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US11/072,886 Continuation-In-Part US7326210B2 (en) | 2003-09-24 | 2005-03-03 | Spinal stabilization device |
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US11/009,097 Abandoned US20050203513A1 (en) | 2003-09-24 | 2004-12-10 | Spinal stabilization device |
US11/072,886 Expired - Lifetime US7326210B2 (en) | 2003-09-24 | 2005-03-03 | Spinal stabilization device |
US11/705,955 Expired - Fee Related US7988710B2 (en) | 2003-09-24 | 2007-02-13 | Spinal stabilization device |
US11/705,950 Abandoned US20070225710A1 (en) | 2003-09-24 | 2007-02-13 | Spinal stabilization device |
US13/450,825 Abandoned US20120209330A1 (en) | 2003-09-24 | 2012-04-19 | Spinal Stabilization Device |
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US11/705,955 Expired - Fee Related US7988710B2 (en) | 2003-09-24 | 2007-02-13 | Spinal stabilization device |
US11/705,950 Abandoned US20070225710A1 (en) | 2003-09-24 | 2007-02-13 | Spinal stabilization device |
US13/450,825 Abandoned US20120209330A1 (en) | 2003-09-24 | 2012-04-19 | Spinal Stabilization Device |
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EP (3) | EP1827265A4 (pt) |
JP (4) | JP2008522748A (pt) |
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CN (3) | CN100586388C (pt) |
AU (2) | AU2006220929A1 (pt) |
CA (3) | CA2591277A1 (pt) |
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IL (1) | IL185648A0 (pt) |
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US20050261686A1 (en) * | 2004-05-14 | 2005-11-24 | Paul Kamaljit S | Spinal support, stabilization |
US20050277919A1 (en) * | 2004-05-28 | 2005-12-15 | Depuy Spine, Inc. | Anchoring systems and methods for correcting spinal deformities |
US20060200239A1 (en) * | 2005-03-03 | 2006-09-07 | Accin Corporation | Posterior lumbar intervertebral stabilizer |
US20060235405A1 (en) * | 2005-03-31 | 2006-10-19 | Hawkes David T | Active compression orthopedic plate system and method for using the same |
US20060264940A1 (en) * | 2003-09-29 | 2006-11-23 | Stephan Hartmann | Dynamic damping element for two bones |
US20070020421A1 (en) * | 2005-07-08 | 2007-01-25 | Olympus Imaging Corp. | Cylindrical part |
US20070118119A1 (en) * | 2005-11-18 | 2007-05-24 | Zimmer Spine, Inc. | Methods and device for dynamic stabilization |
WO2007121080A2 (en) * | 2006-04-10 | 2007-10-25 | Warsaw Orthopedic, Inc. | Elastic plates for spinal fixation or stabilization |
WO2007122385A2 (en) * | 2006-04-13 | 2007-11-01 | Fixator Innovations Limited | Fixator member |
US20070270821A1 (en) * | 2006-04-28 | 2007-11-22 | Sdgi Holdings, Inc. | Vertebral stabilizer |
US20080065079A1 (en) * | 2006-09-11 | 2008-03-13 | Aurelien Bruneau | Spinal Stabilization Devices and Methods of Use |
US20080086127A1 (en) * | 2006-08-31 | 2008-04-10 | Warsaw Orthopedic, Inc. | Polymer Rods For Spinal Applications |
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