Related Experiment Video
Updated: Feb 13, 2026

Iris Fixation via External Pentagram Suturing
Published on: May 5, 2022
Re-design of a uniplanar, monolateral external fixator
1Department of Industrial Engineering (DIN), University of Bologna, Bologna, Italy.
Abstract:
This work deals with the structural analysis of screw clamps for external fixator devices. Screw clamps are widely used in external fixators as a means to connect the half-pins to the fixator body. The analysis is carried out by both numerical and experimental techniques, based on the case study of a clamp produced by Citieffe (Bologna, Italy). As a preliminary activity, the tribological parameters involved in the screw-clamp interaction have been characterized by means of a mixed finite element analysis and experimental procedure. Then, an assessment of the current design of the clamp has been carried out. A re-design has been proposed, which, based on some targeted geometrical modifications, allows achieving higher strength requirements with the same overall dimensions and type of materials. A higher load-bearing capability for a given size may allow the fixator to be used on a broader population. Finally, a list of good practices for the design of this kind of clamps has been proposed.
More Related Videos
Related Concept Videos
Work Done on a System by External Force
In the presence of a non-conservative opposing force, like friction, some part of the work done...
Fixation and Sectioning
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
Group Design
Internal and External Forces
External and Internal Respiration
General External Flow Characteristics

