Evaluation of Locking Bone Screw Heads

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27230%2F18%3A10238979" target="_blank" >RIV/61989100:27230/18:10238979 - isvavai.cz</a>

Výsledek na webu

<a href="https://hrabos.itam.cas.cz/proceedings/2018/pdf/133.pdf" target="_blank" >https://hrabos.itam.cas.cz/proceedings/2018/pdf/133.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.21495/91-8-133" target="_blank" >10.21495/91-8-133</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Evaluation of Locking Bone Screw Heads

Popis výsledku v původním jazyce

When extracting a trauma/orthopaedic titanium alloy implant, there are some difficulties in trying to release some locking bone screws from locking holes of the angularly stable plates (stripping the internal hexagon in the screw heads or twisting off the screw). Experimentally, the magnitude of the torque that causes stripping of the internal hexagon (the Inbus type head) of 3.5 mm locking cortical bone screw made of titanium alloy Ti6Al4V according to ISO 5832-3 was determined. It has been experimentally found that slipping the end of a screwdriver with a hexagonal end inside the head of the locking cortical bone screw when stripping the internal hexagon causes a deformation of the screw head circumference and thus increases the thread friction. The influence of the tightening torque on the ability to unscrew the locking cortical bone screw from the locking hole of the angularly stable plate was evaluated experimentally. The numerical assessment of the five alternatives of the head shapes of the locking cortical bone screws in terms of stresses and resulting deformations has shown that the screw with the Torx type head, which reaches the lowest values of reduced stress and plastic deformation, is the best option.

Název v anglickém jazyce

Evaluation of Locking Bone Screw Heads

Popis výsledku anglicky

When extracting a trauma/orthopaedic titanium alloy implant, there are some difficulties in trying to release some locking bone screws from locking holes of the angularly stable plates (stripping the internal hexagon in the screw heads or twisting off the screw). Experimentally, the magnitude of the torque that causes stripping of the internal hexagon (the Inbus type head) of 3.5 mm locking cortical bone screw made of titanium alloy Ti6Al4V according to ISO 5832-3 was determined. It has been experimentally found that slipping the end of a screwdriver with a hexagonal end inside the head of the locking cortical bone screw when stripping the internal hexagon causes a deformation of the screw head circumference and thus increases the thread friction. The influence of the tightening torque on the ability to unscrew the locking cortical bone screw from the locking hole of the angularly stable plate was evaluated experimentally. The numerical assessment of the five alternatives of the head shapes of the locking cortical bone screws in terms of stresses and resulting deformations has shown that the screw with the Torx type head, which reaches the lowest values of reduced stress and plastic deformation, is the best option.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/TA03010804" target="_blank" >TA03010804: Osteosyntéza zlomenin nohy a ruky</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Engineering Mechanics 2018 : 24th international conference : May 14-17,2018, Svratka, Czech Republic : extended abstracts

ISBN

978-80-86246-88-8

ISSN

1805-8248

e-ISSN

1805-8256

Počet stran výsledku

4

Strana od-do

133-136

Název nakladatele

Institute of Theoretical and Applied Mechanics - Czech Academy of Sciences

Místo vydání

Praha

Místo konání akce

Svratka

Datum konání akce

14. 5. 2018

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

000465489800033