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Axially precise screwdriver

A technology of screw and axial extension, applied in screwdrivers, internal bone synthesis, fastening devices, etc., can solve problems such as loosening, unreliable guarantee of bone cement sealing, torsional strength, and unstable alignment

Active Publication Date: 2019-09-06
AESCULAP AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A non-axially precise connection between the screw and the screwdriver can lead to loosening or, in the worst case, fracture of the pedicle due to screwing in or out of the bone screw
At the same time, there is also the problem that when the screwdriver is put on / inserted, the tightness to the bone cement and the torsional strength cannot be reliably ensured
Furthermore, the alignment between the screwdriver and the screw is not (sufficiently) stable under torque, whereby the alignment of the screwdriver axis relative to the screw axis is not stable
It is also often difficult to re-apply / insert the tool into the screw, especially after the screw has been implanted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] figure 1 Interacting components of an implant set according to a preferred embodiment of the present invention are shown. Thus, a screw, here a pedicle screw 1 , cooperates with a (screwing) tool / screwdriver 2 . The screw head of the screw 1 axially located on its proximal side is fitted with a movable body (tulip-shaped body) 4 which optionally has an insert / embedded portion 6 which It remains axially movable relative to said main body 4 .

[0051] On the tool 2 or on its tool shaft 12 in the radial direction from the proximal side of the tool 2 towards the tool tip / shank tip on the distal side of the tool, a threaded part / threaded sleeve 8 is sleeved, Said screw / threaded sleeve 8 rests axially on a counter-retainer (in the form of a substantially egg-shaped / elliptical rod ring) 10 arranged (axially fixedly) on / Provided at a defined / determinable axial position on the screwdriver / tool ​​shaft.

[0052] figure 2 The head / tip / tool ​​head of the tool 2 is shown in a...

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PUM

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Abstract

The invention relates to an implantation set for implanting a screw (1) in a human or animal body, comprising a tool (2) and a screw (1) designed to receive the tool (2), wherein the screw (1) has a tool receiving region (42) into which or onto which a torque transmission region (18) of the tool (2) can be or is inserted or placed to transmit torque, wherein at least one inclined insertion region(41) is formed on the tool receiving region (42) to guide the tool (2) during insertion of the screw (1), characterised in that the tool (2) forms at least one centring surface (16), which is matchedto the inclined insertion region (41) such that when the centring surface (16) comes into contact with the inclined insertion region (41), a form fit and force fit is created therebetween.

Description

technical field [0001] The present invention relates to an implantation kit for implanting medical (bone) screws in a human or animal body, comprising a tool and a screw designed to receive said tool. Furthermore, the invention relates to a screw and a correspondingly shaped tool, which are arranged and designed for forming an implant set according to the invention. The screw or its screw head has a tool receiving area / tool ​​insertion area, more precisely an insertion bevel area, which is formed proximally of the torque reception / introduction in the screw head. The insertion bevel region is form-coupled and force-coupled to the centering surface of the tool. The centering surface of the tool is formed proximally of a torque transmitting portion of the tool configured for this purpose and adapted to be inserted into the torque receiving / introducing portion in the screw head. Background technique [0002] Screws for implantation in the human and animal body, such as pedicle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25B15/00A61B17/88
CPCB25B15/004A61B17/7082A61B17/8615A61B17/888A61B17/7034B25B23/108
Inventor 凯·菲舍尔斯蒂芬·林德纳
Owner AESCULAP AG