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SPINAL FIXATION SYSTEM AND PEDICLE SCREW THEREFOR

IP.com Disclosure Number: IPCOM000200631D
Publication Date: 2010-Oct-21
Document File: 38 page(s) / 4M

Publishing Venue

The IP.com Prior Art Database

Abstract

Spinal fixation systems, wherein the anchoring element comprises a part that adjoins the vertebra and retains some degrees of movement relatively thereto, are disclosed. The movement of the vertebra adjoining part is characterized by that it is more of an isotropic than polyaxial type. The movements of the vertebra adjoining part is further characterized by that they are micro- and/or vibratory movements. One aspect of the disclosed spinal fixation systems is to provide a non-rigid fixation construct that distributes the loads better between its parts, consequently dispersing a kinetic energy and distributing the loads between the cancellous and the cortical portions of the vertebral tissue; thereby exerting less stress on the standard construct fixation points, namely the cortical portion, thus preventing disintegration thereof, characteristic to the state of the art systems. Another aspect of the disclosed spinal fixation systems is that the aforementioned micro- and/or vibratory movements, between the vertebra adjoining part and the facet of the vertebra disposed vis-à-vis the part, facilitate a prompt ingrowth of the osseous tissue from the latter into the former. Furthermore, the vertebra adjoining part is provided with a porous or mesh-like structure, adapted to accommodate the newly grown osseous tissue.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 8% of the total text.

Page 01 of 38

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SPINAL FIXATION SYSTEM AND PEDICLE SCREW THEREFOR

TECHNICAL FIELD

[001] The present invention relates to posterior spinal fixation systems and methods. In particular, the invention relates to spinal fixation systems that retain

some degrees of movement relatively to the vertebra and a pedicle screw

therefor.

BACKGROUND ART

[002] It is believed that the pertinent state-of-the-art is represented by US

patents Ser. Nos 4805602, 5360431, 5129388, 6032677, 7303563, 5899905, US patent applications Ser. Nos 2005182404, 2008015585, 2009254123, 2002111692, 2005283153, 2005277920, European patent applications Ser. Nos 1059066, 0407332 as well as by Chinese patents/applications Ser. Nos 2562737, 2788752, 201168036, 101224133 and international publication

WO2008045179.

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BRIEF SUMMARY

[003] Known in the art spinal fixation systems that interconnect several vertebrae are typically affixed during their implementation, forming a rigid interconnecting backbone structure that is anchored in the vertebrae and essentially immovable relatively thereto.

[004] There are spinal fixation systems interconnecting several vertebrae while allowing some degrees of freedom in the movement of one vertebra relatively to the other, such as these disclosed in international patent application WO05087120 entitled "PEDICLE SCREW" and US patent 6402752 entitled "POLYAXIAL PEDICLE SCREW". However (emphasis added) neither of those

systems allows a degree of freedom in the movement of anchoring element and

the vertebra itself.

[005] The invention is in particular concerned with providing spinal fixation systems, wherein the anchoring element, henceforth referred to as pedicle screw, comprises a part that adjoins the vertebra and retains some degrees of

movement relatively thereto. The movement of the part that adjoins the vertebra is characterized by that it is more of an isotropic than polyaxial type. The movements of the part that adjoins the vertebra are characterized by that they are micro- and/or vibratory movements. The micro- and/or vibratory movements, hereinafter MVM, between the part that adjoins the vertebra and the facet of the

vertebra disposed vis-à-vis the part facilitate a prompt ingrowth of the osseous tissue from the latter into the former.

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DISCLOSURE OF THE INVENTION

[006] Illustrative embodiments of the invention are described below. In the interest of clarity, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must

be made to achieve the developers' specific goals, such as compliance with technology- or business-related constraints, which may vary from one implementation to another. Moreover, it will be appreciated that the effort of such a development might be complex and time-consuming, but would nevertheless be a rout...