Virtual prototyping of a new intramedullary nail for tibial fractures

Ingrassia, Tommaso; Mancuso, Antonio

doi:10.1007/s12008-012-0175-7

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…To verify the structural strength of the prototype [26,27], biomechanical FEM analyses have been executed [3,28,29]. These FEM analyses were carried out only on the structural parts of the orthosis.…”

Section: Fem Analysesmentioning

confidence: 99%

A new design approach for customised medical devices realized by additive manufacturing

Ricotta

Campbell

Ingrassia

et al. 2020

Int J Interact Des Manuf

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The aim of this work is the design of a new customised elbow orthosis completely realized by Additive Manufacturing and the development of generative algorithms for parametric modelling and creation of 3D patterns to be adapted to the CAD model. This work describes a method to perfect the design of a custom elbow orthosis. A reverse engineering approach has been used to digitalize the patient’s arm and the subsequent CAD modelling of the structure of the custom elbow orthosis has been performed. In particular, two algorithms have been implemented for the creation of 3D patterns and Voronoi tessellations. Subsequently, FEM analyses have been carried out to validate the design. Finally, a prototype of the elbow orthosis with Voronoi tessellation has been realized by means of the SLS technology. The results obtained have demonstrated that the implemented algorithm solved the problems found during CAD modelling with conventional software. Furthermore, the results of FEM analyses have validated the design choices. All this allowed realizing the prototype by AM technologies without problems. Moreover, the new proposed modelling approaches allows creating, in an interactive way, patterns on complex surfaces. The results of this research activity present innovative elements of originality in the CAD modelling sector, which can contribute to solving problems related to the modelling for Additive Manufacturing. Furthermore, another innovative characteristic of the device is the use of torsion springs that simulate the action of physiotherapists during exercises for patient rehabilitation.

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Section: Fem Analysesmentioning

confidence: 99%

A new design approach for customised medical devices realized by additive manufacturing

Ricotta

Campbell

Ingrassia

et al. 2020

Int J Interact Des Manuf

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“…This improvement also allowed an extension of the indication for intramedullary nail beyond shaft fracture cases. This invention also does not interfere with the vascularization of the fractured region; it creates an adequate environment to treat the fracture, permit full function, and most importantly allow patients early mobilization, which consequently accelerates the healing process …”

Section: The Evolutionary Biomechanical Landmarksmentioning

confidence: 99%

“…This invention also does not interfere with the vascularization of the fractured region; it creates an adequate environment to treat the fracture, permit full function, and most importantly allow patients early mobilization, which consequently accelerates the healing process. [22][23][24] In the early 1980s, there was an awareness of the benefits of replacing slotted nail designs with nonslotted ones. This important decision was made on the basis of the limitations identified in the slotted design, such as the low torsional strength of the implant and the fragility of the stress concentration zone (i.e., the transition zone between the nonslotted and slotted portions, which is characterized by material thickness variation).…”

Section: The Evolutionary Biomechanical Landmarksmentioning

confidence: 99%

Recent developments on intramedullary nailing: a biomechanical perspective

Rosa

Marta

Vaz

et al. 2017

Annals of the New York Academy of Sciences

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Combining contributions from engineering and medicine, we highlight the biomechanical turning points in the historical evolution of the intramedullary nailing stabilization technique and discuss the recent innovations concerning increase in bone-implant system stability. Following the earliest attempts, where stabilization of long bone fractures was purely based on intuition, intramedullary nailing evolved from allowing alignment and translational control through press-fit fixation to current clinical widespread acceptance marked by the mechanical linkage between nail and bone with interlocking screws that allow alignment, translation, rotation, and length control. In an attempt to achieve an optimum interfragmentary mechanical environment, recent improvements considered the impact of different biomaterials on bone-implant stiffness. Another strategy considered the increase in the structural stability through the reduction of the number of movements between the different components that constitute the bone-implant system. Intramedullary nail improvements will most likely benefit from merging mechanics and fracture-healing biology by combining surface engineering with sensor tools associated with the innovative progress in wireless technology and with bone-healing biological active agents. Future research should aim at better understanding the ideal mechanobiological environment for each stage of fracture healing in order to allow for intramedullary nail design that satisfies such requirements.

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“…Per individuare la sezione con i valori più elevati (di trazione e compressione) di deformazione sulla quale installare gli estensimetri, si è preliminarmente eseguita una simulazione numerica impiegando un codice di calcolo agli elementi finiti (Ansys Workbench), largamente utilizzato in svariati settori come il biomeccanico [5], quello della sicurezza passiva [6][7][8], la caratterizzazione e ottimizzazione dei materiali compositi. Nel presente lavoro, al fine di semplificare il processo di simulazione numerica, senza però inficiare l'attendibilità dei risultati, sono stati utilizzati modelli FEM semplificati.…”

Section: Procedura Numericaunclassified

Behaviour of a speargun with a novel muzzle Comportamento di un fucile subacqueo con testata innovativa

Ingrassia¹,

Mucera²,

Nigrelli³

2013

Frattura Ed Integrità Strutturale

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The paper presents the results of a numerical and experimental investigation performed on a barrel of a speargun equipped with two kinds of muzzle. In particular, a standard muzzle for speargun (having an elastic propulsion) has been compared with an innovative one called 'roller'. This new muzzle is equipped with two rollers and special bands. The rubber bands, fixed at the lower side of the barrel, run through the rollers and are engaged in suitable seats of the shaft. These bands are, therefore, longer than the traditional ones and, consequently, with equal force applied by the diver, the roller speargun has a longer range. Thanks to the particular geometry of the new muzzle, one of the front constraints of the elastic bands is moved to the lower part of the barrel or the handle. As a consequence, the scheme of the loads applied on the speargun remarkably changes passing from a standard muzzle to a roller one. All that has a great influence on the level of deformation of the barrel and, consequently, on the accuracy of the shot. Because of the low velocity of the spear (if compared with the firearms), in fact, the accuracy of the shoot if strongly influenced by the barrel bending due to the forces applied by means of the elastic bands. In this paper it is experimentally evaluated the bending of the barrel equipped both with the innovative muzzle and with the traditional one in order to compare their performances. The experimental analysis of the barrel was performed by electrical strain gauges suitably located at the section with the highest values of the strains. In order to find the barrel section with the highest strain values where to locate the strain gauges, a preliminary numerical FEM analysis has been performed. The loads and constraints scheme has been evaluated both for the standard and the new muzzle. In particular, the forces due to the elastic bands, their application points and directions have been experimentally obtained. To speed up the process of numerical simulation, without invalidating the results reliability, simplified FEM models have been used. In particular, a very accurate model of the barrel has been shaped, whereas the models of the muzzles and the handle have been simplified. The forces due to the elastic bands, experimentally obtained, have been applied on the FEM models. The maps of the maximum and minimum principal strains have allowed to find the area with the highest strain values, placed in rear part of the barrel (near the handle).The strain values experimentally measured on the speargun have been very similar to the ones calculated by means of the numerical simulations. That demonstrates the developed FEM models are very reliable and can ben used to predict the performances of the speragun under different loads conditions. The speargun with the new roller muzzle shows very lower strain values if compared with the ones measured in the standard one. Nevertheless, considering the two spearguns have different elastic bands setup, it has been thought the comparison of their perfo...

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Virtual prototyping of a new intramedullary nail for tibial fractures

Cited by 12 publications

References 16 publications

A new design approach for customised medical devices realized by additive manufacturing

A new design approach for customised medical devices realized by additive manufacturing

Recent developments on intramedullary nailing: a biomechanical perspective

Behaviour of a speargun with a novel muzzle Comportamento di un fucile subacqueo con testata innovativa

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