The leading cause of lower back pain arises from rupture or degeneration of lumbar intervertebral discs. Pain in the lower extremities is caused by the compression of spinal nerve roots by a bulging disc, while lower back pain is caused by collapse of the disc and by the adverse effects of articulation weight through a damaged, unstable vertebral joint.
In some cases, when a patient having a collapsed disc moves in extension (e.g., leans backward), the posterior portion of the annulus fibrosis or folding of the ligamentum flavum may further compress and extend into the spinal canal. This condition, called “spinal stenosis”, narrows the spinal canal and causes impingement of tissue upon the spinal cord, thereby producing pain.
There have been numerous attempts to provide relief for these afflictions by providing a spacer that inserts between adjacent spinous processes present in the posterior portion of the spinal column. This spacer essentially lifts the upper spinous process off of the lower spinous process, thereby relieving stenosis. In general, these interspinous implants are adapted to allow flexion movement in the patient, but resist or limit extension.
U.S. Pat. No. 6,068,630 (“Zuchermann”) discloses a spinal distraction implant that alleviates pain associated with spinal stenosis by expanding the volume in the spinal canal or neural foramen. Zuchermann discloses a plurality of implants having a body portion and lateral wings. The body portion is adapted to seat between the adjacent spinous processes, while the wings are adapted to prevent lateral movement of the body portion, thereby holding it in place between the adjacent spinous processes.
U.S. Pat. No. 5,645,599 (“Samani”) attempts to relieve spinal stenosis by essentially inserting a flexible horseshoe-shaped device between the adjacent spinous processes. Although the Samani device desirably provides a self-limiting flexibility, it nonetheless suffers from some inadequacies. For example, the Samani device does not provide for natural physiologic rotational movement, nor for post-operative adjustment. In addition, the Samani device discloses the insertion of a bearing cushion, and the adhesive bonding of the bearing cushion to the horseshoe element. However, it is believed that mere adhesive bonding of these elements would cause the cushion to be prone to migration.
The present inventors have developed a number of flexible interspinous devices having a number of desirable features providing improved performance over conventional solutions.
In a first embodiment, the device has a flexible anterior wall having a narrowed portion. The narrowed portion allows the device to twist in response to spinal rotation, thereby more closely mimicking natural physiologic movement.
Therefore, in accordance with the first embodiment of the present invention, there is provided an interspinous implant for insertion between adjacent spinous processes, the implant comprising:
a) a flexible body comprising:
In a second embodiment, the device has a cushion portion interdigitated with each of the upper and lower bearing portions. Because the cushion portion is interdigitated with these elements, a tenacious bond is provided and migration concerns are alleviated.
Therefore, in accordance with the second embodiment of the present invention, there is provided an interspinous implant for insertion between adjacent spinous processes, the implant comprising:
a) a flexible body comprising:
In a third embodiment, the device is adapted to be post-operatively adjustable. The adjustability allows the device to respond to an altered physiologic state, such as an increased collapse of the disc space or decreased patient flexibility, by adjusting the overall stiffness of the implant.
Therefore, in accordance with the third embodiment of the present invention, there is provided an interspinous implant for insertion between adjacent spinous processes, the implant comprising:
For the purposes of the present invention, the term “interspinous” refers to the volume located between two adjacent spinous processes of adjacent vertebrae. The terms “anterior” and “posterior” are used as they are normally used in spinal anatomy. Accordingly, the “anterior” portion of the interspinous device is that portion rests relatively close to the spinal cord, while the “posterior” portion of the interspinous device is that portion rests relatively close to the skin on the patient's back. Now referring to
Now referring to
Now referring to
In preferred embodiments, the flexible body is U-shaped. In other embodiments, the flexible body has a posterior wall (preferably, arcuate) that flexibly connects the posterior portions of the upper and lower bearing surfaces of the flexible body to provide an overall substantially oval shape.
Preferably, the flexible body has a configuration and is made of a material that provides a first stiffness that limits the range of motion of the FSU. In some embodiments, the flexible body stiffness provides at least 50% of the overall initial stiffness of the implant, preferably at least 75%, more preferably at least 90%.
Preferably, the flexible body is adapted to provide a stiffness of between 50 N/mm and 1000 N/mm, more preferably between 100 N/mm and 500 N/mm. When the flexible body stiffness is in this range, it maintains the flexion/extension ROM of a normal lumbar FSU to less than 20 degrees, with less than 13 degrees of motion in flexion and less than 7 degrees of motion in extension. Preferably, the typical displacement of the posterior ends of the device under physiologic loading in the saggital plane is in the range of 1-6 mm.
The flexible can be made of a suitable biocompatible material typically used in structural spinal applications, including metals, plastics and ceramics. In some embodiments, the flexible body is made of a material selected from the group consisting of titanium alloy (including memory metals and superelastic alloys), stainless steel, and chrome cobalt. Preferably, the flexible body is provided in a sterile form.
Now referring to
In some embodiments, the flexible body has a longitudinal cross section having a horseshoe shape. In others, the longitudinal cross-section describes a circle. In others, it is a pill shape. In others, it is substantially oval. In some embodiments, the upper and lower posterior portions are substantially non-parallel.
In some embodiments, as shown in
In some embodiments, the recess 25 defines an upper pair of extensions 45 extending from the bearing surface 33 and collectively defining a bracket. Each extension may comprise a transverse throughhole (not shown) adapted for fixing the implant to the adjacent spinous processes.
In some embodiments, each extension comprises a transverse throughhole adapted for fixing the implant to the adjacent spinous processes. In some embodiments, the implant further comprises a fastening element having a first end extending through the first transverse throughole and a second end extending through the second transverse through-hole.
The flexible body of the present invention preferably has a flexible anterior wall connecting the upper and lower portions of the U-shaped body, thereby providing a spring quality to the U-shaped body for flexibly resisting extreme FSU extension. This flexible anterior wall is preferably shaped to conform with the opposed surfaces of the opposing spinous processes (as shown in
Now referring to
a) a flexible U-shaped body 61:
In use, the cushion element provides a dampening effect upon natural extension. The interdigitated nature of the cushion bond reduces migration concerns.
In some embodiments, the bonding covers substantially the entire extent of the inner surface of the U-shaped body (i.e., the upper surface of the cushion is bonded to the lower surface of the upper posterior portion, the anterior surface of the cushion is bonded to the posterior surface of the flexible anterior wall, and the lower surface of the cushion is bonded to the upper surface of the lower posterior portion).
Now referring to
The cushion element of
Still referring to
In some embodiments, the coating covers only the posterior portions of the inner surface of the U-shaped body (i.e., the lower surface of the upper posterior portion, and the upper surface of the lower posterior portion, but not the posterior surface of the flexible anterior wall).
In some embodiments, a coating may also be applied to the superior side of the upper portion and the inferior side of the lower portion to promote bony ingrowth and osteointegration. In some embodiments thereof, and the coating may include beads, and may have osteobiologic components such as hydroxyapatite or tricalcium phosphate.
The present inventors have noted that there may be a need to correct the range of motion (ROM) provided by a motion disc after the motion disc has been implanted and there is need to change the load transferred through the facet joints to alleviate pain and facet joint degeneration.
For example, because implantation of spinal prostheses is an inexact procedure, there may be times when implantation provides too much or too little motion. For example, in some implantation procedures, damage to the anterior longitudinal ligament (ALL) is contemplated. Because the ALL in its physiologic form restricts the flexion/extension range of the natural disc, damage to it may provide the implanted disc with an unacceptably large range of motion (ROM) in flexion and extension. This overly large ROM is problematic because it produces atypical loads upon the facet joints as well as the adjacent intervertebral discs, thereby leading to premature degeneration of those facet joints and intervertebral discs. Accordingly, there may be a need to post-operatively correct the ROM of the implant in order to fine tune the ROM.
In another example, an implanted disc has an acceptable ROM at the time of implantation, but the patient undergoes typical aging so that the patient's normal range of motion decreases over time. In this case, it may be desirable to decrease the implant ROM so that it corresponds with the patient's natural decreased ROM.
Accordingly, there may be a need to post-operatively correct the ROM of the implant in order to adjust the implant ROM to the new needs of the patient.
The implant of the present invention is advantageous because it can be inserted into the spine at a first stiffness, and then adjusted to a second stiffness to meet the needs of the particular patient.
In a first preferred embodiment, the stiffness of the implant is adjusted post-operatively in order to fine tune the implant to the surgical needs of the patient.
In a second preferred embodiment, the stiffness of the implant is adjusted in order to fine tune the implant to the changing post-surgical needs of the patient.
In many embodiments, the stiffness of the implant is increased in order to reduce the ROM of a functional spinal unit (FSU).
In some embodiments, the implant further comprises a compression spring, and the overall stiffness of the implant is changed by adjusting the length of the compression spring. Now referring to
In use, actuation of the worm screw causes inner thread 363 of the worm screw to turn relative to the outer cylinder 361 of the worm screw. The outer cylinder 361 responds by moving axially upward, thereby forcing compression of the compression spring, and increasing the effective resistance of the device to axial compression.
Now referring to
When it is desired to decrease the range of motion (“ROM”) of the functional spinal unit (“FSU”), the stiffness of the core material may be increased, thereby increasing the stiffness of the implant and its resistance to an axial load. The resulting increase in the stiffness of the interspinous implant provides a more substantial resistance to extension, thereby desirably decreasing the ROM of the FSU to correspond with the needs of the patient.
Similarly, when it is desired to increase the range of motion (“ROM”) of the functional spinal unit (“FSU”), the stiffness of the core material is decreased, thereby decreasing the stiffness of the implant and its resistance to an axial load. The resulting decrease in the stiffness of the interspinous implant reduces resistance to extension, thereby desirably increasing the ROM of the FSU to correspond with the needs of the patient.
The implant of this embodiment of the present invention also has a flexible posterior wall extending between the upper and lower portions of the U-shaped body. This posterior wall is preferably arcuate and preferably connects the upper surface of the lower portion and the lower surface of the upper portion of the U-shaped body to form a substantially oval body (as shown). In this condition, the posterior wall provides substantial closure to the U-shaped body. Accordingly, adjustment of the stiffness of the core material residing within the outer shell increases or decreases the stiffness of the implant.
The compliance of the sidewalls is selected to correspond with the level of resistance desired by the implant. For example, in some embodiments (as in
In other embodiments, however, the sidewalls can be made of metal, and even be integral with the outer shell. In these embodiments, the sidewalls will be flexible but more rigid than a plastic membrane. In these embodiments, the relative rigidity of the sidewalls will not allow the core material to bulge significantly laterally, thereby augmenting the resistance provided by the core material to the axial load.
Preferably, the core is a fluid material contained within the cavity of the shell and is made of a material having a quality whose adjustment will produce a change in the stiffness of the implant. When the stiffness of the core is adjusted, the overall stiffness of the implant correspondingly changes. In some embodiments, the core has a first stiffness and contributes between 10 and 20% of the overall initial stiffness of the implant. In such embodiments, the stiffness of the core is increased to a second stiffness that increases the overall initial stiffness of the implant up to at least 40% to provide an adjusted implant stiffness of at least 300 N/mm, and more preferably at least 500 N/mm. When the implant stiffness is in this range, the implant can by itself provide sufficient stiffness to reduce the extension of a normal lumbar FSU to less than 7 degrees, preferably less than 5 degrees.
Preferably, the core material is selected to be sensitive to an external stimulus, which, when applied, stimulates the core material to adjust its stiffness from a first stiffness to a second stiffness. In some embodiments, the stimulus stimulates the core to increase its stiffness. In some embodiments, the stimulus stimulates the core to lower its stiffness.
Preferably, the core material is sensitive to a stimulus selected from the group consisting pH, light, and electric current.
In preferred embodiments, the core material comprises a hydrogel. In preferred embodiments, the hydrogel undergoes expansion when stimulated by a decreased pH. The resulting expansion of the core material increases the stiffness of the core, thereby increasing the stiffness of the implant and providing increased resistance to extension by the FSU. In some embodiments, the hydrogel is selected from ionic polymers disclosed in US Published Patent Application No. 2002/0039620, the specification of which is incorporated by reference in its entirety. In some embodiments, the hydrogel is selected from ionic polymers disclosed in U.S. Pat. No. 6,475,639, the specification of which is incorporated by reference in its entirety.
When pH is selected as the stimuli, in some embodiments, an acid or a base is introduced into the core material from an ex vivo source. For example, the acid or base can be administered subcutaneously via a hypodermic needle and introduced into the core material through a fluid port 455. The provision of a fluid port provides the surgeon with the flexibility to selected the amount of acid or base needed to suit the needs of the patient.
In other embodiments in which pH is selected as the stimuli, the implant further comprises a container that individually houses and sequesters the acid or base from the core material. For example, the acid or base can be sequestered in a valved, separate compartment within the shell that is in fluid connection with the cavity housing the core material. The valve is opened (for example, by telemetry), the acid or base enters the cavity housing the core material and mixes with the core material. The resulting pH change causes a change in the specific volume of the core material, thereby increasing or decreasing the stiffness of the core material and the overall implant. The advantage of this embodiment is that the stiffness of the implant is changed through a completely non-invasive technique.
In some embodiments (not shown), the device could be made of a shape memory metal having a relatively flexible property during the martensitic phase and a relatively stiff property in the austenitic phase. In one embodiment, this memory metal device could be implanted in its flexible martensitic phase. If the clinician desires to increase the stiffness of the implant, the clinician could raise the temperature of the device (by heating) to a temperature above its austenitic phase, thereby increasing the stiffness of the device and increasing its resistance to an axial compressive load.
In some embodiments of the present invention, the implant further comprises smart features for helping the surgeon monitor and react to the changing conditions of the implanted device.
In some embodiments, a sensing means is also used with the implant of the present invention. This sensing means analyzes physical surroundings. Its purpose is to identify when a significant change has occurred which could warrant adjusting the stiffness of the implant. The sensor can be contained within the implant, or provided as a stand alone entity.
In some embodiments, a reporting means for reporting the findings of the sensors to an ex vivo source is also used with the implant of the present invention. The reporter can be contained within the implant, or provided as a stand alone entity.
In some embodiments, a receiver for receiving ex vivo-generated information is also used with the implant of the present invention. The receiver can be contained within the implant, or provided as a stand alone entity.
In some embodiments, the implant comprises two shells having flexible anterior walls extending in the same direction, wherein the stiffness is adjusted by adjusting the distance between the respective flexible anterior walls. Now referring to
In use, the implant of
Now referring to
In other embodiments, the slots of the implant of
Therefore, in accordance with the present invention, there is provided an interspinous implant for insertion between adjacent spinous processes, the implant comprising:
In preferred embodiments, the implant of the present invention is used posteriorly in conjunction with a motion disc inserted within the disc space of the anterior portion of the spinal column. For example, in some embodiments, the implant of the present invention is used in conjunction with a motion disc having a large range of motion (“ROM”). Various motion discs are described by Stefee et al. in U.S. Pat. No. 5,071,437; Gill et al. in U.S. Pat. No. 6,113,637; Bryan et al. in U.S. Pat. No. 6,001,130; Hedman et al. in U.S. Pat. No. 4,759,769; Ray in U.S. Pat. No. 5,527,312; Ray et al. in U.S. Pat. No. 5,824,093; Buttner-Janz in U.S. Pat. No. 5,401,269; and Serhan et al. in U.S. Pat. No. 5,824,094; all which documents are hereby incorporated herein by reference in their entireties. The flexibility of the flexible body provides resistance to extreme extension, thereby restricting the motion disc to a more narrow and more physiologically desirable range of motion.
Therefore, in accordance with the present invention, there is provided a kit for providing therapy to a functional spinal unit comprising an upper vertebrae having an upper spinous process, a lower vertebrae having a lower spinous process, and a disc space therebetween, the kit comprising:
a) an interspinous implant for insertion between adjacent spinous processes, the implant comprising a flexible (preferably, U-shaped) body comprising:
This application is a continuation of U.S. application Ser. No. 15/787,998, filed on Oct. 19, 2017, which is a continuation of U.S. application Ser. No. 15/446,554, filed on Mar. 1, 2017, which is a continuation of U.S. application Ser. No. 15/149,132, filed on May 8, 2016 (now U.S. Pat. No. 9,662,149), which is a continuation of U.S. application Ser. No. 15/149,085, filed on May 7, 2016 (now U.S. Pat. No. 9,662,148), which is a continuation of U.S. application Ser. No. 15/148,937, filed on May 6, 2016 (now U.S. Pat. No. 9,662,147), which is a continuation of U.S. application Ser. No. 14/845,687, filed on Sep. 4, 2015 (now U.S. Pat. No. 9,402,654), which is a continuation of U.S. application Ser. No. 14/134,090, filed on Dec. 19, 2013 (now abandoned), which is a division of U.S. application Ser. No. 10/793,967, filed on Mar. 6, 2004 (now U.S. Pat. No. 8,636,802), each of which is hereby incorporated by reference in its entirety.
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Number | Date | Country | |
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20180271565 A1 | Sep 2018 | US |
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Parent | 10793967 | Mar 2004 | US |
Child | 14134090 | US |
Number | Date | Country | |
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Parent | 15787998 | Oct 2017 | US |
Child | 15927512 | US | |
Parent | 15446554 | Mar 2017 | US |
Child | 15787998 | US | |
Parent | 15149132 | May 2016 | US |
Child | 15446554 | US | |
Parent | 15149085 | May 2016 | US |
Child | 15149132 | US | |
Parent | 15148937 | May 2016 | US |
Child | 15149085 | US | |
Parent | 14845687 | Sep 2015 | US |
Child | 15148937 | US | |
Parent | 14134090 | Dec 2013 | US |
Child | 14845687 | US |