Capless multiaxial screw and spinal fixation assembly and method

a multi-axial screw and screw technology, applied in the field of spinal fixation assembly and method, can solve the problems of spinal rod threading, spinal rod threading, number of parts and components, etc., and achieve the effect of improving spinal fixation

Inactive Publication Date: 2007-05-31
X SPINE SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The present invention improves the spinal fixation and the locking between an elongated member or rod and a screw.
[0014] One object of the invention is to provide a system and method that reduces or eliminates the need for external or internal caps or screws to lock the relative position of a rod to a screw.
[0015] Another object of the invention is to provide a simple bayonet-type connection that eliminates the fixation systems of the past and / or simplifies the spinal fixation procedure.

Problems solved by technology

However, in many cases, in particular cases involving fusion across the lumbosacral articulation and where there are many levels involved, pseudorarthrosis is a problem.
One detriment of the systems in the two Harms et al. patents is that the spinal rod must be threaded in order to accept the compression nuts.
One of the problems with the prior art devices is the number of parts and components, especially those components that utilize a threaded cap screw to secure the rod to the anchoring screw, whether internal or external, to fix the rod relative to the screw.
Problems with the threaded fastener, that is, threaded cap or set screw, are numerous and include risk of cap loosening, loss of cap intra-operatively, cross threading, thread failure, failure of the cap in driving instrument and limitations upon torque application.

Method used

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  • Capless multiaxial screw and spinal fixation assembly and method
  • Capless multiaxial screw and spinal fixation assembly and method
  • Capless multiaxial screw and spinal fixation assembly and method

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Embodiment Construction

[0066] Referring now to FIGS. 1-3, a capless multi-axial screw and spinal fixation assembly 10 and method are shown. The assembly 10 comprises a screw 12 having a threaded portion 12a and a head 12b that in the embodiment being described, has a rounded profile or curvature, as best illustrated in FIGS. 3 and 10-13. The screw head 12b comprises a hex female opening 12c for receiving a tool (not shown) for screwing the screw 12 into an aperture 14a of a spinal bone 14, such as a vertebra of a spine.

[0067] As illustrated in FIGS. 1 and 2, one feature of the invention is that it enables a user to fix a relative position of a plurality of vertebrae, such as vertebrae 14, 16 and 18 in FIG. 1, in a fixed and stabilized position.

[0068] The system 10 comprises a retainer or receiver 20 having a generally cylindrical receiver wall 20c (FIG. 4) that defines an aperture or bore 22 that traverses or extends along a receiver axis A (FIG. 11) the entire length of the receiver 20, as best illustr...

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PUM

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Abstract

A bone fixation assembly and capless multi-axial screw system and method are shown. The assembly comprises a receiver having a rotary lock which in one embodiment includes a plurality of channels which urge and lock the elongated member to the screw using a bayonet type connection.

Description

RELATED APPLICATION DATA [0001] This application is a continuation-in-part of application Ser. No. 11 / 193,523, filed Jul. 29, 2005, which is incorporated herein by reference and made a part hereof.BACKGROUND OF THE INVENTION [0002] This invention relates to a capless multiaxial screw and spinal fixation assembly and method, particularly useful for fixing and / or aligning vertebrae of the spine. The invention permits multiple angular orientations of an elongated member or rod with respect to a screw that is screwed into a vertebra. [0003] Various methods of spinal immobilization have been known and used in the past. The preferred treatment for spinal stabilization is immobilization of the joint by surgical fusion or anthrodesis. This method has been known since development in 1911 by Hibbs and Albe. However, in many cases, in particular cases involving fusion across the lumbosacral articulation and where there are many levels involved, pseudorarthrosis is a problem. It was discovered ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F2/30
CPCA61B17/7032A61B17/7037A61B17/7002
Inventor KIRSCHMAN, DAVID LOUIS
Owner X SPINE SYST
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