Device for connecting a longitudinal bar to a pedicle screw

a technology of longitudinal bars and screws, applied in the field of devices for connecting longitudinal bars to pedicles, can solve the problems of relative complexity of locking mechanisms for securing longitudinal bars, and achieve the effect of convenient handling

Inactive Publication Date: 2006-07-06
DEPUY SYNTHES PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this and similar pedicle screws is the relatively complicated locking mechanisms for securing the longitudinal bar inserted into the open pedicle screw head.
Furthermore, in most cases the head of the screw can be aligned with the position of the longitudinal bar only to a limited extent, necessitating complicated bending of the longitudinal bar to correct the angle.

Method used

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  • Device for connecting a longitudinal bar to a pedicle screw
  • Device for connecting a longitudinal bar to a pedicle screw
  • Device for connecting a longitudinal bar to a pedicle screw

Examples

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Embodiment Construction

[0026] The device according to the invention illustrated in FIGS. 1 and 2 generally includes a body 3 in the form of a hollow cylindrical bushing with an axis 4 (axis of the hollow cylinder) and a hollow cylindrical collet chuck 7 arranged coaxially so it can slide in the interior of body 3.

[0027] Body 3 has a through hole 6 running across axis 4 that intersects the cylindrical surface of the hollow cylinder at two points symmetrically with axis 4. Collet chuck 7 also has a through hole 17 running across axis 4. Insertion of a longitudinal bar 1 running across axis 4 is made possible by the aligned arrangement of through holes 6 and 17 as illustrated in FIG. 2.

[0028] In its upper part, collet chuck 7 is secured within (hollow cylindrical) body 3 by a press fit and can be displaced axially with respect to body 3 when the relatively high force of the press fit is overcome.

[0029] Hollow cylindrical body 3 and collet chuck 7 are preferably in a rotationally locked arrangement relativ...

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PUM

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Abstract

A device for connecting a longitudinal bar to a pedicle screw for fixation of the spine includes a body having an axis, an upper end, a lower end, a hole coaxial with the axis, and a through hole positioned perpendicular to the axis. The device also includes a collet chuck slidably disposed within the hole. The collet chuck includes a through hole substantially aligned with the through hole of the body for receiving the longitudinal bar. The collet chuck also includes a chamber defined by elastic tongues for receiving the head of the pedicle screw.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This is a division of U.S. patent application Ser. No. 10 / 122,405, filed Apr. 16, 2002, now U.S. Pat. No. ______, which is a continuation of U.S. patent application Ser. No. 09 / 341,963, now U.S. Pat. No. 6,371,957, which is a national stage of PCT International Application No. PCT / CH97 / 00019, filed Jan. 22, 1997, all of which are hereby incorporated by reference in their entireties.FIELD OF THE INVENTION [0002] The invention concerns a device for connecting a longitudinal bar to a pedicle screw. BACKGROUND OF THE INVENTION [0003] From the related art, a large number of pedicle screws for fixation of the spinal column are already known; these known pedicle screws have the advantage that the individual pedicle screw can be attached to or removed from the longitudinal bar at any time without having to dismantle the entire fixation system. Such a pedicle screw is known from European Patent No. 330,881 B, for example. [0004] The disadvantage...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F2/30A61B17/70A61B17/58
CPCA61B17/7032A61B17/7035A61B17/7037A61B17/7034
Inventor AMREIN, THOMASHESS, MARTIN
Owner DEPUY SYNTHES PROD INC
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