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Device for connecting longitudinal support to pedicle screw

A longitudinal and torus technology, applied in the direction of internal fixator, internal bone synthesis, fixator, etc., can solve problems such as fixation system failure, and achieve the effect of improving angular stability

Inactive Publication Date: 2004-03-24
SYNTHES GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The loosening of the clamping tool immediately leads to the failure of the entire fixing system; and

Method used

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  • Device for connecting longitudinal support to pedicle screw
  • Device for connecting longitudinal support to pedicle screw
  • Device for connecting longitudinal support to pedicle screw

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] exist figure 1 and 2 The device according to the invention shown in is mainly composed of a clamping head 3, which has a central axis 4 and an upwardly opening yoke groove 5 perpendicular to the central axis 4 for receiving the longitudinal support 1, and a downwardly open , tapered downwards, frusto-conical hollow cavity 6 with central axis 4, in which a hollow frusto-conical collet 7 with alternating grooves 8 is placed axially movably, it is designed for Receives the head 9 of the torus screw 2 .

[0047] Such as figure 2 As shown, the frustoconical hollow cavity 6 preferably has a half-cone angle α / 2 of approximately 6°. The hollow frustoconical collet 7 with alternating grooves 8 has a corresponding half-cone angle α / 2 of approximately 6°. Due to its groove 8 , the collet 7 can be stretched approximately 0.4 mm in diameter and compressed up to 1 mm in diameter, so that the head 9 of the torus-shaped screw 2 can snap into it elastically. For this purpose, the ...

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PUM

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Abstract

The invention relates toa device used to connect a longitudinal support to a pedicle screw by means of an accommodating head having a channel to accommodate the longitudinal support, wherein it is possible to freely choose from or mix laterally open, top open or closed accommodating heads. A top open accommodating head facilitates, for example, insertion of the longitudinal support, whereas a lateral opening enables lateral corrections. The pedicle screw and the accommodating head are connected via a conical collet chuck in the accommodating head and by a spherical head on the pedicle screw. It is thus possible to subsequently engate the accommodating head and screw in the pedicle screw even without the accommodating head, thereby allowing better visibility when assembling the pedicle screw. According to the embodiment, a clamping member for the longitudinal support is built into the clamping screw of the spherical head or integrated into the intermediate element and the longitudinal support and the spherical head can be fastened separately.

Description

technical field [0001] The invention relates to a device for connecting a longitudinal support and a torus screw in a vertebral fixation system, which has a clamping head with a central axis and a groove running perpendicular to the central axis for receiving the longitudinal support Groove, there is also a receiving recess for the clamping tool that is open upwards and a hollow cavity with a central axis that is conically tapered downwards and that is open downwards, in which a collet with a central axis is coaxially slidable, The collet is designed to elastically receive the head of the torus-shaped screw, with the hollow recess extending axially upwards into the receiving recess of the clamping tool. Background technique [0002] Numerous torus screws are known from the state of the art for vertebral fixation, which have the advantage that individual torus screws can be implanted independently of the longitudinal support. The longitudinal brackets can later be inserted w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B17/70
Inventor 弗里多林·施拉普费
Owner SYNTHES GMBH