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shaft precision screwdriver

A technology of screws and threaded parts, applied in the field of screws and tools of corresponding shapes, can solve the problems of not being able to reliably ensure the sealing performance of bone cement and torsional strength, fracture of pedicles, unstable alignment, etc. Simplified rejoining, preventing leakage

Active Publication Date: 2021-11-16
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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  • shaft precision screwdriver
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Examples

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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 implant kit for implanting a screw (1) in a human or animal body, having a tool (2) and a screw (1) designed to receive said tool (2), wherein said The screw (1) has a tool receiving area (42) into which the torque transmission area (18) of the tool (2) can be inserted / slidable or inserted / slidable for torque transmission or Thereon, wherein at least one insertion bevel area (41) is formed at the tool receiving area (42) for guiding the tool (2) during insertion of the screw (1), characterized in that the Said tool (2) forms at least one centering surface (16), said centering surface (16) and said insertion bevel area (41) being adjusted in such a way that between said centering surface (16) and said When inserting the beveled area (41) into contact, form coupling and force coupling between them are formed.

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 Patents(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