Design and Manufacturing Preparation of a Patient Specific Acetabular Cage

2013 ◽  
Vol 837 ◽  
pp. 328-333 ◽  
Author(s):  
Serban Costin ◽  
Constantin Anton Micu
Keyword(s):  
Design Process ◽  
Hip Replacement ◽  
Patient Specific ◽  
Direct Metal Laser Sintering ◽  
Design And Manufacturing ◽  
Different Shapes ◽  
Solid Works ◽  
True Center ◽  
Acetabular Defects ◽  
Process Strategy

Total hip arthoplasty or hip replacement is today a common and highly successful a surgical procedure. However, in the revision artoplasty the procedure is more complicated, as standard devices have to be adapted to different shapes of acetabular defects, which are patient specific especially when they are bigger and wider spread. This kind of big defects, sever acetabular defects, pelvic discontinuity, defects resulted from tumor problems, protrusion, can usually be addressed with a standard Burch-Schneider Antiprotrusio Cage or a Mueller Ring in order to restore the mechanics and the true center of the hip. This paper proposes a design process and manufacturing preparation for a patient specific acetabular cage. The design is intended to fix problems that standard cages sometimes do not resolve, for example insufficient fixation due to the fact that the inferior flange did not engage the ischium, problems of bone graft resorption and in the same time tries to remain an affordable solution. The design process uses as input information the 3D reconstruction of the patient hip from CT scan. Important parameters like the position of the true center of rotation, acetabular anteversion and inclination are determined and calculated. Other parameters, such as number of fixing screws and their designated holes or the amount of bone to be covered with the custom acetabular cage (fixation surface), are proposed by orthopaedic specialist. The design methodology relays on commercial software, such as Solid Works for CAD, 3D Doctor for 3D bone reconstruction from the CT scans or other software for different file transformations. The model was optimized to be produced through direct metal laser-sintering (DMLS). Regarding the results, the particular implant was designed and optimized for fabrication and it is available to be produced. During the design process, although a systematized process was undertaken and implemented, some activities could not be done in systematic, repeatable way. Nevertheless, a design process strategy was established, so that the design would match the requirements of such implant and also a requirements list for the type and form of information needed for this kind of design. Also, we concluded that using software to automate some of the operations that were done manually by the operator would help decrees the design time and improve the repeatability of the process.

Bridging and Repairing Patient Specific Acetabular Defects with a New Custom Acetabular Cage

2013 ◽  
Vol 587 ◽  
pp. 412-415
Author(s):  
Serban Costin ◽  
Constantin Anton Micu ◽  
Stefan Cristea
Keyword(s):  
3D Reconstruction ◽  
Additive Technologies ◽  
Ct Scans ◽  
Patient Specific ◽  
Different Shapes ◽  
Acetabular Defects ◽  
Graft Resorption ◽  
Standard Components

Sever acetabular defects can usually be addressed with a standard acetabular cage. The procedure is more complicated, as standard devices have to be adapted to different shapes of acetabular defects, especially when they are bigger and widespread. The proposed cage tries to fix problems that standard cages sometimes do not resolve for example insufficient fixation due to the fact that the inferior flange did not engage the ischium, graft resorption and at the same time tries to remain affordable. The implant is being built based on the 3D reconstruction of the patient hip from CT scans with the help of additive technologies and uses standard components (cup, screws). The particular implant was designed and produced and it is available for patient implantation. The proposed solution offers a better fit alternative for the patient but realization of the implant is very time consuming, although a systematized process was tried and achieved.

The Bus Factor in Conceptual System Design: Protecting a Design Process Against Major Regional and World Events

2021 ◽  
Author(s):  
Douglas L. Van Bossuyt ◽  
Ryan M. Arlitt
Keyword(s):  
System Design ◽  
Design Process ◽  
Manufacturing Process ◽  
Storage System ◽  
Disease Outbreaks ◽  
Industrial Sector ◽  
Conceptual System ◽  
Design And Manufacturing ◽  
Renewable Energy Generation ◽  
Virtual Events

Abstract We introduce a method to help protect against and mitigate possible consequences of major regional and global events that can disrupt a system design and manufacturing process. The method is intended to be used during the conceptual phase of system design when functional models have been developed and component solutions are being chosen. Disruptive events such as plane crashes killing many engineers from one company traveling together, disease outbreaks killing or temporarily disabling many people associated with one industrial sector who travel to the same conference regularly, geopolitical events that impose tariffs or complete cessation of trade with a country that supplies a critical component, and many other similar physical and virtual events can significantly delay or disrupt a system design process. By comparing alternative embodiment, component, and low-level functional solutions, solutions can be identified that better pass the bus factor where no one disruptive event will cause a major delay or disruption to a system design and manufacturing process. We present a simplified case study of a renewable energy generation and storage system intended for residential use to demonstrate the method. While some challenges to immediate adoption by practitioners exist, we believe the method has the potential to significantly improve system design processes so that systems are designed, manufactured, and delivered on schedule and on budget from the perspective of significant disruptive events to design and manufacturing.

A Process Management Strategy for Re-Design: An Anchoring Adjustment Approach

1998 ◽  
Author(s):  
Lisa A. Dixon ◽  
Jonathan S. Colton
Keyword(s):  
Design Process ◽  
Management Strategy ◽  
Process Management ◽  
General Pattern ◽  
Evaluation Metrics ◽  
Anchoring And Adjustment ◽  
Adjustment Model ◽  
Design Activities ◽  
Design Process Model ◽  
Process Strategy

Abstract Preceding research on the re-design process focused on the development and verification of an Anchoring and Adjustment design process model. Compared to the existing, predominantly top-down, models, this new model was tailored specifically to describe designers’ approaches to re-design tasks. Building upon that work, this paper presents an evaluation of a re-design process strategy that is based on the key elements identified in the Anchoring and Adjustment model (a general pattern for re-design activities and two evaluation metrics). The overall goal was to formulate an efficient and effective process management strategy unique to re-design activities. Data were collected from three industry re-design projects for the evaluation. First, an analysis of the data confirmed that the pattern of design activities and evaluation metrics used by the company’s designers could be mapped onto those that comprise the Anchoring and Adjustment model. Second, the analysis of the data suggested that with additional formalization — based on an anchoring and adjustment approach — the company’s current process management technique could provide more accurate feedback to the designers for the more efficient and effective management of their re-design processes. One of the industry case studies is detailed to illustrate the research results and conclusions.

Variation in femoral anteversion in patients requiring total hip replacement

2019 ◽  
Vol 30 (3) ◽  
pp. 281-287
Author(s):  
Jim W Pierrepont ◽  
Ed Marel ◽  
Jonathan V Baré ◽  
Leonard R Walter ◽  
Catherine Z Stambouzou ◽  
...  
Keyword(s):  
Total Hip Replacement ◽  
Hip Replacement ◽  
Femoral Stem ◽  
Femoral Anteversion ◽  
Patient Specific ◽  
3 Dimensional ◽  
Total Hip ◽  
Age Related ◽  
Gender And Age ◽  
Implant Alignment

Background: Optimal implant alignment is important for total hip replacement (THR) longevity. Femoral stem anteversion is influenced by the native femoral anteversion. Knowing a patient’s femoral morphology is therefore important when planning optimal THR alignment. We investigated variation in femoral anteversion across a patient population requiring THR. Methods: Preoperatively, native femoral neck anteversion was measured from 3-dimensional CT reconstructions in 1215 patients. Results: The median femoral anteversion was 14.4° (−27.1–54.5°, IQR 7.4–20.9°). There were significant gender differences (males 12.7°, females 16.0°; p < 0.0001). Femoral anteversion in males decreased significantly with increasing age. 14% of patients had extreme anteversion (<0° or >30°). Conclusions: This is the largest series investigating native femoral anteversion in a THR population. Patient variation was large and was similar to published findings of a non-THR population. Gender and age-related differences were observed. Native femoral anteversion is patient-specific and should be considered when planning THR.

Three driven approaches to combinational creativity: Problem-, similarity- and inspiration-driven

2017 ◽  
Vol 233 (2) ◽  
pp. 373-384 ◽  
Author(s):  
Ji Han ◽  
Dongmyung Park ◽  
Feng Shi ◽  
Liuqing Chen ◽  
Min Hua ◽  
...  
Keyword(s):  
Design Process ◽  
Driving Forces ◽  
Idea Generation ◽  
Creative Design ◽  
Research Projects ◽  
Crucial Element ◽  
Creative Idea ◽  
Process Strategy ◽  
Design Ideas

Creativity is a crucial element of design. The aim of this study is to investigate the driving forces behind combinational creativity. We propose three driven approaches to combinational creativity, problem-, similarity- and inspiration-driven, based on previous research projects on design process, strategy and cognition. A case study involving hundreds of practical products selected from winners of international design competitions has been conducted to evaluate the three approaches proposed. The results support the three driven approaches and indicate that they can be used independently as well as complementarily. The three approaches proposed in this study have provided an understanding of how combinational creativity functions in design. The approaches could be used as a set of creative idea generation methods for supporting designers in producing creative design ideas.

Integrating Design Process Knowledge With CAD Models

2001 ◽  
Author(s):  
Erik E. Hayes ◽  
William C. Regli
Keyword(s):  
Design Process ◽  
Computer Aided Design ◽  
Search Space ◽  
Temporal Changes ◽  
Boundary Representation ◽  
Process Knowledge ◽  
Solid Models ◽  
Design And Manufacturing ◽  
Cad Models ◽  
Manufacturing Problems

Abstract Solid models are static entities, often defined by boundary representation models as sets of enclosing surfaces. Constructive Solid Geometry and feature-based computer-aided design environments create procedural descriptions of 3D objects in forms of history or CSG trees. These representations are temporally fixed, i.e., they describe the state of an object at a point in time. This paper describes a method to represent and capture temporal evolution of solid models — what we call model process history. We define process history to be all states of a model — the search space of design process. This paper presents a representational formalism we call model process graphs (MPGs). We use MPGs to integrate a model’s description with a model of temporal changes that occur during the design process. We believe that MPG representations can have valuable application for many design and manufacturing problems. The paper describes our preliminary results to use MPGs to (1) create a record of design process; (2) store process-based design rationale; (3) represent in-process shapes for machined artifacts. We anticipate that similar structures will find application in other design and manufacturing problems where important process knowledge is embodied by temporal changes occurring in model evolution.

scholarly journals Fate of bone grafting for acetabular defects in total hip replacement

2015 ◽  
Vol 49 (2) ◽  
pp. 181 ◽  
Author(s):  
AnilThomas Oommen ◽  
VigneshPrasad Krishnamoorthy ◽  
PradeepMathew Poonnoose ◽  
RaviJacob Korula
Keyword(s):  
Total Hip Replacement ◽  
Bone Grafting ◽  
Hip Replacement ◽  
Total Hip ◽  
Acetabular Defects

scholarly journals Patient Specific Vascular Benchtop Models for Development and Validation of Medical Devices for Minimally Invasive Procedures

2016 ◽  
Vol 01 (03) ◽  
pp. 1640008 ◽  
Author(s):  
Maryna Kvasnytsia ◽  
Nele Famaey ◽  
Michal Böhm ◽  
Eva Verhoelst
Keyword(s):  
Medical Devices ◽  
Physical Models ◽  
Patient Specific ◽  
Invasive Procedures ◽  
Device Development ◽  
Transcatheter Aortic Valve ◽  
Design And Manufacturing ◽  
Aortic Valve Implantation ◽  
Valve Implantation ◽  
Development And Validation

Using realistic benchtop models in early stages of device development can reduce time and efforts necessary to move the device to further testing. In this study, we propose several patient specific vascular benchtop models for the development and validation of a robotic catheter for transcatheter aortic valve implantation. The design and manufacturing of these models, and their properties are presented. Additionally, it is demonstrated that the described design process provides virtual models that are accurately linked to the physical models.

Preliminary results of a 3D-printed acetabular component in the management of extensive defects

2017 ◽  
Vol 28 (3) ◽  
pp. 266-271 ◽  
Author(s):  
Mustafa Citak ◽  
Lilly Kochsiek ◽  
Thorsten Gehrke ◽  
Carl Haasper ◽  
Eduardo M Suero ◽  
...  
Keyword(s):  
Bone Loss ◽  
Acetabular Component ◽  
Complication Rate ◽  
Primary Outcome Measure ◽  
Patient Specific ◽  
Component Technique ◽  
Revision Tha ◽  
3D Printed ◽  
Acetabular Defects ◽  
Acetabular Components

Introduction: The treatment of extensive bone loss and massive acetabular defects can be compounded by several challenges and pitfalls. The survivorship following acetabular revision with extensive bone loss is still unsatisfactory. The goal of the present study was to analyse the outcomes of 3D-printed patient-specific acetabular components in the management of extensive acetabular defects and combined pelvic discontinuity (PD). Methods: 9 patients underwent revision THA using 3D-printed custom acetabular components to reconstruct extensive acetabular defects. The Paprosky classifications were determined in all patients. The primary outcome measure was the implant-associated failure rate. Results: 1 out of 9 patients suffered an implant-associated complication (11%). The overall implant-associated survival rate was 89%. The overall complication rate was 56%. Conclusions: The patient-specific acetabular component technique shows promise for the treatment of patients with severe acetabular defects in revision THA. Further research aimed at reducing costs and improving the complication rate are warranted.

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