WO2009067515A1

WO2009067515A1 - Spine support implant including inter vertebral insertable fluid ballastable insert and inter-vertebral web retaining harness

Info

Publication number: WO2009067515A1
Application number: PCT/US2008/084037
Authority: WO
Inventors: Miguel A. Linares
Original assignee: Linares Medical Devices, Llc
Priority date: 2007-11-19
Filing date: 2008-11-19
Publication date: 2009-05-28
Also published as: US20090131984A1; EP2211739A4; CN101990419A; EP2211739A1

Abstract

An implant support device associated with succeeding spinal vertebrae, including a harness exhibiting a plurality of legs, each extending from a rotatable bearing or suitable interconnecting support. Each of the legs terminates in an angled tang, this being engaged with a surface of a selected vertebrae. Additional features include undercut portions defined between the legs and arcuate/hemispherical mounting locations surrounding the bearing in individually rotatably permitting fashion. Inter-vertebral support cushions are also positioned between succeeding vertebrae, and can be incorporated with or provided separately from the web support harnesses.

Description

SPINE SUPPORT IMPLANT INCLUDING INTER VERTEBRAL INSERTABLE FLUID BALLASTABLE INSERT AND INTER- VERTEBRAL WEB RETAINING HARNESS

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This Application is claims priority of United States Provisional Patent Application Serial No. 60/988,921 filed November 19, 2007 and United States Patent Application Serial No. 12/273,067 filed November 18, 2008. The contents of both are incorporated herein by reference in their entirety.

FIELD OF THE INVENTION

[0002] The present invention teaches a improved applications of spinal support implants, these relating in particular to versions of web harness supports for use with succeeding vertebrae and which, in combination with selective cushioning implants or integrally defined and displaceably mounted disk portions formed with the web harnesses, operate to provide a degree of movement permitting support to a damaged spinal column, short of requiring the vertebrae be fused together. By virtue of avoiding the prior art necessity of fusing selected vertebrae within the spinal column, the remaining (non-fused) vertebrae are prevented from being overloaded, which will otherwise occur, and suffering premature damage.

BACKGROUND OF THE INVENT ION

[0003] The prior art is well documented with varying examples of inter-vertebral positioning and supporting devices. The advantage in each instance is to fuse or immobilize the vertebrae, such as in response to injury or illness. Fusing or immobilizing inter- vertebral movement is often necessary in order to prevent ongoing discomfort or pain which can result from undesirable contact between misaligned or misshapen vertebrae, in particular when the spinal nerve column or its individual branches are affected.

[0004] Examples of known inter- vertebral stabilization devices are such as those set forth in US 2007/0093829 to Abdou and US 6,645,207 to Dixon. Other insert or repair structures are also known, and which are positioned between opposing annular (or body) portions of succeeding vertebrae. One example of this is set forth in the disk repair structure Zucherman 2005/0216087. Additional examples include the artificial spinal fusion implants in Michelson, US 5,522,899, as well as in US 5,782,832, to Larsen. SUMMARY OF THE INVENTION

[0005] The present invention discloses a spinal support implant for positionally securing succeeding vertebrae associated with a spinal column. . Each of the preferred variants includes one or more web retaining harnesses, each of which exhibits a plurality of hardened plastic legs extending from central and hemi- spherical mounting locations. These hemispherical location include such as overlapping portions surrounding a central bearing in secured and rotatively permissive fashion.

[0006] The legs each include, at remotely extending ends, such as tangs/detents that securely mount to such as undercut locations in the individual vertebrae. In this fashion, the web harness generally and positionally immobilizes the successive spinal vertebrae to which it is attached, and while permitting a minor degree of misalignment and movement, such as is common in normal spinal activity, this again being prevented by such conventional alternate procedures as spinal fusion utilizing anchoring screws and plates.

[0007] An inter-vertebral support cushion can be provided separately or in integral combination with the web-retaining harness and which defines and additional component of the present invention which can be pre-positioned between succeeding vertebrae. In one variant, and following being pre-positioned in location (such as between opposing body or annular facing surfaces of succeeding disks) the bladder configured cushion can be selectively injection pressurized with a fluid, this in order to establish a given bias pressure. Another version of the present inventions combines the web support harnesses and inter-vertebral support cushions into a single article, which again features the hardened plastic legs extending from central and hemispherical mounting locations integrally formed with an edge location of the disk portion surrounding a central bearing in secured and rotatively permissive fashion, the legs again including tangs/detents that securely mount to such as undercut locations in the individual vertebrae.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Reference will now be made to the attached drawings, when read in combination with the following detailed description, wherein like reference numerals refer to like parts throughout the several views, and in which:

[0009] Fig. 1 is a plan view illustration of one arrangement of a web retaining harness associated with a plurality of vertebrae forming a part of a spinal column according to an embodiment of the present inventions and for controllably and displacingly supporting successive vertebrae; [0010] Fig. 2A is a top view of a further configuration of web support harness according to the present inventions;

[0011] Fig. 2B is a plan view similar to Fig. 1 of the harness configuration shown in Fig. 2A, and illustrating peripheral engagement location of the of the mounting detents associated with the harness;

[0012] Fig. 3 is an illustration of a selected support harness and illustrating features such as hardened plastic legs extending from central and hemi-spherical mounting locations surrounding a central bearing in secured and rotatively permissive fashion, and including tangs/detents that securely mount to such as undercut locations in the individual vertebrae;

[0013] Fig. 3A is a partial view of a selected and inner most located bearing;

[0014] Fig. 3B is a further partial view illustrating a selected bearing and partial overlapping annulus contact associated with a given engagement leg;

[0015] Fig. 3C is a yet further partial view and illustrating a multiple overlapping relationship established by a plurality of three leg supporting annulus and bearing surface contact portions;

[0016] Fig. 4 is an illustration of an inter-vertebral support cushions defining a component of the present inventions and which is selectively injection pressurized with a suitable fluid medium in the manner illustrated;

[0017] Fig. 5 is an illustration similar to Fig. 1, and showing a further example of combination inter-vertebral web support harnesses and cushions;

[0018] Fig. 6 is a side plan view of a further configuration of support column with combination support disc retaining web harness according to another embodiment of the present inventions;

[0019] Fig. 7 is a top view of a vertebrae such as is also shown in Fig. 6 and such as is known in the Prior Art;

[0020] Fig. 8 is a perspective view of the combination disk and retaining web support harness according to the further preferred embodiment of Fig. 7;

[0021] Fig. 9 is a side plan view of the combination disk and harness of Fig. 8 and further showing the features of the hardened plastic legs extending from central and hemi-spherical mounting locations integrally formed with an edge location of the disk portion and surrounding a central bearing in secured and rotatively permissive fashion, the legs again including tangs/detents that securely mount to such as undercut locations in the individual vertebrae;

[0022] Fig. 9A is an exploded view of one configuration of leg and rotatable bearing as also shown in Fig. 9; [0023] Fig. 10 is an illustration of an alternate mounting configuration of an inter-vertebral support disk; and

[0024] Fig. 1OA is a further perspective illustration of the variant shown in Fig. 10.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Figure 1 is an illustration of a first arrangement of a web retaining harness 10 for controllably and displacingly supporting successive vertebrae, and as are shown at 2, 4, 6 and 8, forming a part of a spinal column. As previously discussed, the several variants of vertebral support implants, as disclosed herein, operate to provide a degree of movement permitting support to a damaged spinal column, and short of requiring the vertebrae be fused together as is conventionally performed in an attempt to address many spinal injuries, but which typically result in the patient experiencing significant losses in spinal mobility.

[0026] As is also described in reference to Figs. 3-3C, the web support harness is illustrated as a pair of identically configured harnesses 10, typically each including hardened plastic legs, see at 12, 14, 16 and 18. The legs each extend from central and hemi-spherical mounting locations, see at 20 and 22 in Fig. 3, these in turn surrounding a central bearing 24 in secured and rotatively permissive fashion.

[0027] While not limited to any specific material composition, the legs 12-18 can exhibit a composite plastic with sanitary or antibiotic properties and can further establish a desired degree of flex (or bend) so as to provide considerable positional engagement of the associated vertebrae, and while still providing for any incrementally (or minor) desired degree of movement between the vertebrae. In this fashion, the vertebrae are positionally immobilized to the degree desired, while at the same time the patient may still be provided with some minor degree of residual movement or flexibility, this consistent with the material aspects of the harness leg construction. [0028] As shown in Fig. 3, one or more of the pairs of legs (e.g. see as again shown at 12 & 14, as well as at 16 & 18) can extend from each of first 20 and second 22 hemi-spherical (or arcuate) mounting locations, it being understood that the overlapping mounting locations are further capable of being constructed according to other shapes and configurations, and such that the legs 12-18 can exhibit respective degrees of flexibility, both individually and vis-a-vis one another. In this fashion, any degree of permissible rotation of the arcuate portions (e.g. hemispherical) 20 and 22 are transferred to the individual and integrally extending pairs 12 & 14 and 16 & 18 of legs. Each of the legs 12-18 further includes tangs (or prong shaped detents), see as respectively shown at 26, 28, 30 and 32 in Fig. 3, these being integrally formed at the outboard ends of the associated legs and which securely mount to such as drilled undercut locations formed in each of the individual vertebrae 2, 4, 6, and 8.

[0029] Although not illustrated, it is also envisioned that alternate fasteners can be employed for mounting the extending ends of the web harness legs to the associated vertebrae at locations which will promote optimal inter-vertebral stability and while allowing the vertebrae the possibility of exhibiting minor incremental degrees of flex or bend. In this fashion, any significant misalignment between vertebrae is prevented, and such as which could otherwise entail the undesirable incidence of pinching of the spinal nerve column (see as shown in the Prior Art illustration of Fig. 7 as associated with selected spinal vertebrae 6').

[0030] As further again shown at 24 in Fig. 3A, a partial view of a selected and inner most located bearing (see also Figs. 1 and 3) is illustrated and which can include such as heavy duty nylon or other suitable material construction. As previously described, the first 20 and second 22 hemi-spherical (or arcuate) mounting locations are formed in mutually contacting and edge overlapping fashion, these encasing the centrally positioned bearing 24 and so that the bearing facilitates a desired degree of "give" or rotational support (see arrow 25 in Fig. 3 in relation to selected leg 12). It is also envisioned that the legs illustrated herein can be attached to such as undercut portions associated with the bearing mounting locations and in order to provide an alternate mounting variant.

[0031] Figure 3B is a further partial view (with selected contact portion 22 removed) and illustrating bearing 24 and overlapping contact portion 20, from which extend each of the plurality of legs 12-18. It is also understood that the individual and arcuate shaped contact portions (e.g. again at 20 and 22) can exhibit any relative shape, as well as configuration for interconnecting in relative rotatable freedom about the bearing 24, the purpose for which being to impart a desired degree of rotational give or bend to the individual legs.

[0032] Figure 3C is a yet further partial view and illustrating multiple and mutually overlapping edges established by a plurality of three leg supporting annulus and bearing surface contact portions, see at 33, 33' and 33", these surrounding the central bearing 24 As shown in Fig. 3c, individual extending legs (illustrated in reduced length) extend from the individual overlapping and bearing surface contact portions, it being understood that any plurality of legs as well as any number of individual bearing surface supported and overlapping contact portions, can be provided and which establish any desired degree of inter-rotation, bend or give to the individual legs.. [0033] Referring now to Figure 2A, a top view of a further configuration of web support harness, see at 34, and specifically illustrating the feature of the associated legs 36 and 38 angled in order that the end defined tangs, at 40 and 42, are mounted to substantially peripheral (outer) most defined locations associated with the selected vertebrae 8. The illustration of Fig. 2A further evidences the degree of flexibility (or bend) which is afforded the individual legs and in order to conformingly apply about the exterior periphery of the associated vertebrae. Referencing Fig. 2B, the peripheral location of the upper most extending pair of legs 36 & 38 and associated mounting detents 40 & 42 is again shown associated with the harness 34 and in contrast to the mounting arrangement of Fig. 1.

[0034] Consistent with that previously shown and described in reference to Figs. 3-3C, the construction of each harness again includes a central bearing, about which is supported one or more rotatably permissive contact locations, e.g. at 44. As further shown in Fig. 2B, the harness 34 includes a second (lower) pair of legs 46 and 48 with associated detents 50 and 52 and which likewise engage peripheral most defined locations associated with the succeeding vertebrae 6. The illustrations of Figs. 1 and 2B are intended to demonstrate the range of possible mounting variations which are possible with the web support harness, and in particular the ability of the various extending legs to engage any suitable vertebral location, not limited to a peripheral edge or specified height location.

[0035] Referencing now Fig. 4, an illustration is shown at 54 of an inter-vertebral support cushion, this defining a component which is capable of being used in combination with the web support harnesses 10. As shown, the cushion 54 is constructed of a flexible and fluid retaining (as well as sanitary) plastic exhibiting an open interior (see as shown at 55 in cutaway). A syringe 56 is provided and includes a projecting needle 57 which allows for a volume of fluid contained within the syringe cylinder to be injected into the support cushion 54.

[0036] The construction and consistency of the cushion (or bag) 54 is such that it is capable of being pre-positioned between succeeding vertebrae, as shown in Fig. 5, following which it is selectively injection pressurized in the manner illustrated. Figure 5 additionally illustrates an example of a combination of inter-vertebral web support harnesses and cushions 54. The web support harness illustrated in Fig. 5 differs from that previously described, and includes in the illustrated embodiment a lengthwise extending support, this shown by stem 58 extending in overlapping fashion over any number of successively positioned vertebrae, and from which extend pairs of legs 60 & 62, 64 & 66, 68 & 70, and 72 & 74. Each of the individual pairs of legs extending in angular offset from the lengthwise (inter- vertebral) extending support 58. [0037] The individual pairs of legs in Fig. 5 further extend in diagonally and alternating offsetting fashion, and such that respective end defined tangs/detents associated with each pair of legs secure to upper and lower opposite end locations of a selected vertebrae 2-8, thereby position ally supporting the individual vertebrae via the lengthwise extending and central supporting stem 58. It is also envisioned that adhesives can be employed for securing the lengthwise and diagonally offsetting legs. Additionally, the fluid injectable cushions 54, upon being filled, are designed in one variant to cure and set, this to establish minimal/incremental degrees of permitted movement relative to opposing annulus surfaces of the central body portions of the individual vertebrae (see again Fig. 5), and the cushions are further prevented from dislodging from between the vertebrae by virtue of the exterior surface mounted web harnesses, and which may be provided along each of opposite exterior sides of a pair of interconnected vertebrae.

[0038] Referring now to Figs. 6 and 8, both perspective and side environmental plan views are shown of a further configuration of support column with combination support disc and retaining web harness 76, according to another embodiment of the present inventions. In particular, and is most clearly illustrated in each of Fig. 8 and the assembly views of Figs. 9 and 9A, the combination disk and retaining web support harness includes the features of hardened plastic legs, see as shown at 78 and 80, these extending from central and hemi-spherical shaped mounting portions, at 82 and 84.

[0039] As further shown, an inter-vertebral disk inserting portion 86, such as also exhibiting a hardened surface, is integrally formed in extending fashion with an edge location of a selected mounting portion (in this instance 82). As shown in each of the side (Fig. 6) and ninety degree rotated (Fig. 9) views, the disk inserting portion 86 is positioned in the space established between a pair of opposing and succeeding annular body surfaces of selected vertebrae, subsequent to which the legs 78 and 80 are secured to surface locations of the succeeding vertebrae. [0040] The variation of Fig. 9A differs somewhat from that shown in Figs. 8 and 9, and by which the mounting portions are modified, see as shown at 82' and 84', such that the first portion 82' exhibits an enlarged inner arcuate recess, into which is resistively and snap-fit engaged the second (smaller dimensioned) portion 84'. The bearing is again shown at 88 and is sized so that it is supported upon the inner recess of the second mounting portion 84' and, upon snap fitting the first larger mounting portion 82' over the bearing 88 and second smaller portion 84', establishes a desired degree of movement between the legs 78 and 80.

[0041] The extending legs 78 and 80 each exhibit end-configured detents 90 and 92 which secure to such as again undercut locations (not shown) formed along the sides of the vertebrae. Accordingly, a modified range of motion is permitted between the legs 78 and 80, by virtue of the snap-fit arrangement established by the hemi-spherical portions 82 and 84 (or at 82' and 84' in Fig. 9A) about the spherical shaped bearing 88 supported therebetween. It is further understood that the combination disc support and retaining harness 76 can also be provided, either additionally or alternatively, to any of the harness or interior support cushion arrangements described herein. [0042] Finally, Figs. 10 and 1OA illustrate a yet further alternate mounting configuration in which is provided an inter-vertebral support disk, see at 94. As opposed to the pair of support legs in the variant of Fig. 8, a single mounting location is provided by extending and inwardly angled leg 96 (this being illustrated substantially "L" shaped relative to the insertable disk portion 94) and which terminates in a single tang/detent mounting location 98. The purpose of the support disk 94 variant is, in part, to illustrate one of a number of potentially different configurations which can be employed in installing a combination central disc support and exterior surface engaging harness between succeeding spinal vertebrae.

Having described my invention, other and additional preferred embodiments will become apparent to those skilled in the art to which it pertains, and without deviating from the scope of the appended claims:

I claim:

Claims

1. An implant support device utilized with succeeding spinal vertebrae, comprising: a harness comprising a central support from which extends a plurality of legs, each of said legs exhibiting a specified degree of flexibility and terminating in an angled tab, each of said tabs engaging a location associated with at least each of first and second succeeding vertebrae; and said harness affording limited motion between the succeeding vertebrae.

2. The device as described in claim 1, further comprising a bearing incorporated into said central support.

3. The device as described in claim 2, further comprising at least first and second arcuate extending portions supported around said central supported bearing, said legs extending from said arcuate mounting locations, such that any degree of permissible rotation of said arcuate portions is transferred to said legs.

4. The device as described in claim 3, said first and second arcuate portions each exhibiting a substantially hemispherical shape and sandwiching therebetween said bearing.

5. The device as described in claim 3, said arcuate extending portions further exhibiting mutually overlapping edges.

6. The device as described in claim 4, further comprising undercut portions defined between said legs and said arcuate/hemispherical shaped mounting locations surrounding said bearing in individually rotatably permitting fashion.

7. The device as described in claim 6, said undercut portions further comprising a snap-fit arrangement from which said legs individually extend.

8. The device as described in claim 1, further comprising an inter- vertebral support cushion positioned between succeeding vertebrae.

9. The device as described in claim 8, further comprising said cushion being constructed of a flexible and fluid injectable plastic and, upon being pre-positioned between succeeding vertebra, being injected with an internally ballasting and curable/settable composition for establishing a degree of supported and incremental movement between the vertebrae.

10. The device as described in claim 1, further comprising a lengthwise extending stem incorporating said central support, and from which extend pairs of legs in angular offsetting fashion.

11. An implant support device utilized with succeeding spinal vertebrae, comprising: a central support disk having a specified shape and size; at least one leg extending from an edge of said disk and exhibiting a specified degree of flexibility, said leg terminating in an angled tab engaging a location associated with at least one of first and second succeeding vertebrae, to position said central disk between opposing and spaced annulus surfaces of the succeeding vertebrae, said device affording limited supported motion between the succeeding vertebrae.

12. The device as described in claim 11, further comprising a plurality of hardened plastic legs extending from first and second central and resistively inter-engaging mounting locations, a selected one of said mounting locations being integrally formed with said edge of said inter-vertebral positioned disk.

13. The device as described in claim 12, further comprising a bearing supported between said first and second mounting locations, facilitating a degree of rotation of said mounting locations relative to said bearing.

14. An implant support device utilized with succeeding spinal vertebrae, comprising: a central support from which extends a plurality of legs, each of said legs exhibiting a specified degree of flexibility and terminating in an angled tab, each of said tabs engaging a location associated with at least each of first and second succeeding vertebrae; a bearing incorporated into said central support, at least first and second arcuate extending portions supported around said bearing, said legs extending from said arcuate mounting locations, such that any degree of permissible deflection of said arcuate portions is transferred to said legs.

15. The device as described in claim 14, said first and second arcuate portions each exhibiting a substantially hemispherical shape and sandwiching therebetween said bearing.

16. The device as described in claim 15, further comprising undercut portions defined between said legs and said arcuate/hemispherical shaped mounting locations surrounding said bearing in individually rotatably permitting fashion.

17. The device as described in claim 16, said undercut portions further comprising a snap-fit arrangement from which said legs individually extend.

18. The device as described in claim 14, further comprising an inter- vertebral support cushion positioned between succeeding vertebrae.

19. The device as described in claim 18, further comprising said cushion being constructed of a flexible and fluid injectable plastic and, upon being pre-positioned between succeeding vertebra, being injected with an internally ballasting and curable/settable composition for establishing a degree of supported and incremental movement between the vertebrae.

20. The device as described in claim 14, further comprising a lengthwise extending stem overlaying the succeeding vertebrae and incorporating a plurality of spaced apart central supports, individual pairs of legs extending from each of said supports in angular offsetting fashion relative to said lengthwise extending stem..