Experimental Equipment Call - University of Leeds
Lead Research Organisation:
University of Leeds
Department Name: Sch of Computing
Abstract
The objective of this proposal is to refresh and update key items of experimental equipment in activities aligned to proven strengths and critical mass in Medical Engineering and Advanced Materials at the University of Leeds.
The Institute of Medical and Biological Engineering hosts the largest and most advanced musculoskeletal simulation facility in the world. The new simulators will support three of our strategic research challenges: longer lasting joint replacements; regenerative devices and biological scaffolds for tissue repair; and, advanced simulation systems for virtual analysis and design and preclinical testing. They will deliver enhanced functionality, allowing the development and introduction of SAFER (Stratified Approaches For Enhanced Reliability) simulation methods to address the requirements of stratified and personalized medical devices, biomaterials and scaffolds. The simulators will be used for research into the tribology and wear of artificial joints, validation of novel computational methods for prediction of function, studies of wear debris and supporting biocompatibility research and studies of the tribology of biological scaffolds in natural joints, using recently developed methods.
Our research in terahertz (THz) frequency electronics and photonics is internationally leading by any criterion. Much of this activity requires a state-of-the-art and dedicated MBE semiconductor growth system. The new MBE system will allow us to protect the UK's international reputation in this field and, in particular, in the growth and exploitation of THz frequency quantum cascade lasers (QCLs). Over the next five years we will: develop state-of-the-art THz QCLs across the 1-5 THz range, maximizing operating temperature, continuous-wave performance, output power, and gain bandwidth; develop THz QCLs engineered into robust device architectures for use as, for example, local oscillators in earth-observation and planetary science missions; develop compact bench-top QCL-based technologies producing intense, narrowband and precisely controllable pulses for non-linear THz science; and, develop self-organised quantum rod structures for cavity-QED experiments, and new optically-pumped, vertical-cavity surface-emitting room temperature THz lasers.
The Leeds Electron Microscopy and Spectroscopy (LEMAS) Centre is a highly successful shared electron microscopy facility. It has high visibility nationally (providing an EPSRC open access scheme for external users since 2008) and internationally (leading the consortium that formed the UK facility at SuperSTEM Daresbury). One of the next great challenges is apply high-resolution imaging and microanalytical techniques to beam sensitive materials, including advanced hybrid materials comprising organic and inorganic components. These are increasingly employed to develop new device and product functionalities. The specification of the new microscope is unique and designed to enable fast mapping of frozen specimens at high accelerating voltage to preserve their chemistry and structure whilst extracting nanostructural information.
We are internationally recognised in spintronics and magnetic materials, with recent appointments extending our materials expertise to include organic molecules, piezoelectrics, topological insulators and superconductors. The new deposition tool will ensure we can continue to supply top quality thin film materials to the UK and internationally, as well as underpinning a general theme of spintronic meta-materials. The functional properties of meta-materials emerge through the design and engineering of the constituent material combinations. With our broad background that includes the ability to structure materials at the nanoscale so that cooperative behaviour arises, we will apply this capability to questions in strategic areas such as quantum effects for new technology, beyond CMOS electronics, energy efficient electronics, and new tools for healthcare.
The Institute of Medical and Biological Engineering hosts the largest and most advanced musculoskeletal simulation facility in the world. The new simulators will support three of our strategic research challenges: longer lasting joint replacements; regenerative devices and biological scaffolds for tissue repair; and, advanced simulation systems for virtual analysis and design and preclinical testing. They will deliver enhanced functionality, allowing the development and introduction of SAFER (Stratified Approaches For Enhanced Reliability) simulation methods to address the requirements of stratified and personalized medical devices, biomaterials and scaffolds. The simulators will be used for research into the tribology and wear of artificial joints, validation of novel computational methods for prediction of function, studies of wear debris and supporting biocompatibility research and studies of the tribology of biological scaffolds in natural joints, using recently developed methods.
Our research in terahertz (THz) frequency electronics and photonics is internationally leading by any criterion. Much of this activity requires a state-of-the-art and dedicated MBE semiconductor growth system. The new MBE system will allow us to protect the UK's international reputation in this field and, in particular, in the growth and exploitation of THz frequency quantum cascade lasers (QCLs). Over the next five years we will: develop state-of-the-art THz QCLs across the 1-5 THz range, maximizing operating temperature, continuous-wave performance, output power, and gain bandwidth; develop THz QCLs engineered into robust device architectures for use as, for example, local oscillators in earth-observation and planetary science missions; develop compact bench-top QCL-based technologies producing intense, narrowband and precisely controllable pulses for non-linear THz science; and, develop self-organised quantum rod structures for cavity-QED experiments, and new optically-pumped, vertical-cavity surface-emitting room temperature THz lasers.
The Leeds Electron Microscopy and Spectroscopy (LEMAS) Centre is a highly successful shared electron microscopy facility. It has high visibility nationally (providing an EPSRC open access scheme for external users since 2008) and internationally (leading the consortium that formed the UK facility at SuperSTEM Daresbury). One of the next great challenges is apply high-resolution imaging and microanalytical techniques to beam sensitive materials, including advanced hybrid materials comprising organic and inorganic components. These are increasingly employed to develop new device and product functionalities. The specification of the new microscope is unique and designed to enable fast mapping of frozen specimens at high accelerating voltage to preserve their chemistry and structure whilst extracting nanostructural information.
We are internationally recognised in spintronics and magnetic materials, with recent appointments extending our materials expertise to include organic molecules, piezoelectrics, topological insulators and superconductors. The new deposition tool will ensure we can continue to supply top quality thin film materials to the UK and internationally, as well as underpinning a general theme of spintronic meta-materials. The functional properties of meta-materials emerge through the design and engineering of the constituent material combinations. With our broad background that includes the ability to structure materials at the nanoscale so that cooperative behaviour arises, we will apply this capability to questions in strategic areas such as quantum effects for new technology, beyond CMOS electronics, energy efficient electronics, and new tools for healthcare.
Planned Impact
The research engendered through these investments will provide wide benefit both within the UK and internationally, and includes economic and societal benefits. It will also enhance the skills-base of UK researchers. Illustrative examples are given here, with further examples and more detail provided in the Pathways to Impact.
Economic impact: The University of Leeds has a longstanding track record of translating research to industrial end-users though direct collaboration, licencing of IP, and spin-out, and this has formed a proven model for future translational activity. Alongside direct engagement through established company collaborations, impact and long-term sustainability will be maximized by developing new activity with industry. This will be achieved in part using the resources of the University's innovation hubs, in conjunction with the University's Research and Innovation Service, which deliver knowledge transfer activities in focused industrial sector areas, exploiting HEIF and other funding. Our new Innovation and Enterprise Centre will further stimulate collaboration between external companies, and public and private organizations, and the university; it will also significantly increase our accommodation for technology-led company incubation and provide an active business incubation programme. The 'North-East Quarter' development will embed shared and incubator space adjacent to the Schools involved in this bid.
Skills: Access to the refreshed equipment will enhance the skills and training of four groups of individuals in particular:
1. Post-doctoral research assistants (PDRAs) working on collaborative projects will gain higher-level skills. Typically 80% of PDRAs move on to future careers in industry or public/government bodies that will benefit from the enhanced experience derived.
2. The equipment will support the research training and skills of PhD students funded through our EPSRC DTP and Case awards, and our EPSRC Centres for Doctoral Training (CDTs) where there is a particular focus on innovation and translation. These include four Leeds-based CDTs (Complex Particulate Products & Processes, Molecular-Scale Engineering, Tissue Engineering & Regenerative Medicine, and Bioenergy), and partner CDTs (Soft Matter & Functional Interfaces, Integrated Tribology, Next Generation Nuclear, and Carbon Capture & Storage).
3. Industry collaborators, who will gain advanced knowledge, and for whom we will provide specialised training (e.g. for customers of Simulation Solutions in industry, government and academia).
4. Undergraduate and postgraduate students who undertake individual and group projects embedded in the Leeds research groups; the refreshed equipment will enhance their training, skills and employability.
The University is also committed to support the training, development and career progression of technical staff who operate, support and manage these high-level technical facilities.
Wider Societal Benefits: Our work here has wide societal benefit - two illustrative examples include: 1. Terahertz frequency quantum cascade laser-based satellite instrumentation for measurement of key atmospheric species will inform understanding of the chemistry and energy balance of the upper atmosphere, their connection with global climate change, and its resulting societal impact. 2. The ageing population has clear expectations of remaining mobile and healthy, with ambitions of 'fifty active years after fifty'. Our research on SAFER devices and interventions supports this: patients will benefit from more reliable, longer lasting interventions; NHS and policy makers will benefit through more effective, reliable and cost effective treatments; and, the international standards authority (ISO) will benefit from our research outputs and knowledge, and we will input draft standards and enhancements to existing standards.
Economic impact: The University of Leeds has a longstanding track record of translating research to industrial end-users though direct collaboration, licencing of IP, and spin-out, and this has formed a proven model for future translational activity. Alongside direct engagement through established company collaborations, impact and long-term sustainability will be maximized by developing new activity with industry. This will be achieved in part using the resources of the University's innovation hubs, in conjunction with the University's Research and Innovation Service, which deliver knowledge transfer activities in focused industrial sector areas, exploiting HEIF and other funding. Our new Innovation and Enterprise Centre will further stimulate collaboration between external companies, and public and private organizations, and the university; it will also significantly increase our accommodation for technology-led company incubation and provide an active business incubation programme. The 'North-East Quarter' development will embed shared and incubator space adjacent to the Schools involved in this bid.
Skills: Access to the refreshed equipment will enhance the skills and training of four groups of individuals in particular:
1. Post-doctoral research assistants (PDRAs) working on collaborative projects will gain higher-level skills. Typically 80% of PDRAs move on to future careers in industry or public/government bodies that will benefit from the enhanced experience derived.
2. The equipment will support the research training and skills of PhD students funded through our EPSRC DTP and Case awards, and our EPSRC Centres for Doctoral Training (CDTs) where there is a particular focus on innovation and translation. These include four Leeds-based CDTs (Complex Particulate Products & Processes, Molecular-Scale Engineering, Tissue Engineering & Regenerative Medicine, and Bioenergy), and partner CDTs (Soft Matter & Functional Interfaces, Integrated Tribology, Next Generation Nuclear, and Carbon Capture & Storage).
3. Industry collaborators, who will gain advanced knowledge, and for whom we will provide specialised training (e.g. for customers of Simulation Solutions in industry, government and academia).
4. Undergraduate and postgraduate students who undertake individual and group projects embedded in the Leeds research groups; the refreshed equipment will enhance their training, skills and employability.
The University is also committed to support the training, development and career progression of technical staff who operate, support and manage these high-level technical facilities.
Wider Societal Benefits: Our work here has wide societal benefit - two illustrative examples include: 1. Terahertz frequency quantum cascade laser-based satellite instrumentation for measurement of key atmospheric species will inform understanding of the chemistry and energy balance of the upper atmosphere, their connection with global climate change, and its resulting societal impact. 2. The ageing population has clear expectations of remaining mobile and healthy, with ambitions of 'fifty active years after fifty'. Our research on SAFER devices and interventions supports this: patients will benefit from more reliable, longer lasting interventions; NHS and policy makers will benefit through more effective, reliable and cost effective treatments; and, the international standards authority (ISO) will benefit from our research outputs and knowledge, and we will input draft standards and enhancements to existing standards.
Publications
Abdelgaied A
(2018)
A comprehensive combined experimental and computational framework for pre-clinical wear simulation of total knee replacements.
in Journal of the mechanical behavior of biomedical materials
Abdelgaied A
(2017)
A comparison between electromechanical and pneumatic-controlled knee simulators for the investigation of wear of total knee replacements.
in Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
Al-Hajjar M
(2017)
Wear of composite ceramics in mixed-material combinations in total hip replacement under adverse edge loading conditions.
in Journal of biomedical materials research. Part B, Applied biomaterials
Ali M
(2016)
Influence of hip joint simulator design and mechanics on the wear and creep of metal-on-polyethylene bearings.
in Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
Bayati M
(2016)
Synthesis and Activity of A Single Active Site N-doped Electro-catalyst for Oxygen Reduction
in Electrochimica Acta
Bowland P
(2018)
Simple geometry tribological study of osteochondral graft implantation in the knee.
in Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
Bowland P
(2018)
Development of a preclinical natural porcine knee simulation model for the tribological assessment of osteochondral grafts in vitro.
in Journal of biomechanics
Brockett CL
(2018)
Influence of conformity on the wear of total knee replacement: An experimental study.
in Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
Brockett CL
(2016)
The influence of simulator input conditions on the wear of total knee replacements: An experimental and computational study.
in Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine
Description | Through the EPSRC Experimental Equipment Call, a new molecular beam epitaxy (MBE) system was purchased for growth of III-V semiconductors, complementing and extending the capability within the University, which was being provided by a system that was over 10 years old. The availability of state-of-the-art MBE growth has underpinned a number of new awards, including: EP/R00501X/1, The physics of plasmonic gain in low-dimensional electronic systems, PI Cunningham, EPSRC Responsive, £527, 764, 1/12/2017 - 5/3/2021 (and the complementary theory grant at Imperial (PI O Sydoruk, EP/R004994/1, £364,232)). EP/P021859/1, HyperTerahertz - High precision terahertz spectroscopy and microscopy, PI Davies, EPSRC Programme, £6,517,861, 1/06/2017 - 31/5/2022 EP/P001394/1, Ti:Sapphire Regenerative Amplified Laser System for ultrafast, high-field terahertz photonics, PI Dean, EPSRC Equipment (but the MBE provides the material for emitters and detectors), £451,951, 1/08/2016 - 31/7/2021 EC H2020 FET OPEN 'MIR-BOSE', 737017, Mid- and far-IR optoelectronic devices based on Bose-Einstein condensation, led by Universite Paris-Sud, 1/01/2017-31/12/2020 Research outputs will be, and are being, reported against these grants, as they arise. Through the same EPSRC experimental equipment call, a new Cryo-enabled TEM/STEM with high solid angle EDS detector and dual EELS was provide to replace a system that was 20 years old. This and related equipment in the Leeds Electron Microscopy and Spectroscopy centre has approximately 450 users and has supported numerous grant proposals (EPSRC, BBSRC, NERC, EU) from users. It is also being used by external users as part of the Sir Henry Royce Institute for Advanced Materials access scheme and as part of EP/R02863X/1 The Leeds EPSRC Nanoscience and Nanoequipment User Facility |
Exploitation Route | Details on taking the findings forward and use by others can be found under the outputs reported for each of the research grants listed above that are making use of the new equipment at the University provided by the EPSRC Experimental Equipment Call. |
Sectors | Chemicals Electronics Manufacturing including Industrial Biotechology |
Description | The Transmission Electron microscope was installed in 2016. Usage stabilised by 2017/18 and, in the last full year, ignoring the COVID-19 lockdown, we had ~220 separate user sessions involving 1000 h charged at TRAC rates for 80 different users from 10 Leeds Departments, 10 external universities and 2 industrial consultancies (i.e. 26% external usage). Since 2016, the instrument has contributed data to 77 journal publications (e.g. in Nature Catalysis, ACS Advanced Science, Small), and 15 funded grants (EPSRC, EU, BBSRC, MRC). The microscope is used for UG teaching, PGR training (including CDT and Royce workshops, and the annual Royal Microscopical Society Electron Microscopy School), public engagement (UoL BeCurious festival plus Leeds Creative Labs: Bragg Edition), and has featured on BBC Radio 4's Inside Science (5/3/2020). The expertise gained in the microscopy of beam sensitive materials led to our co-organisation of a published 2019 Royal Society discussion meeting on 'Dynamic in-situ microscopy' (Ilett et al Phil Trans A 2020; 10.1098/rsta.2019.0601), follow on funding for further instrumentation for soft matter analysis (e.g. awards of a cryo-focused ion beam scanning electron microscope (FIBSEM) (EP/P00122X/1) now with cryo-grippers for transfer to the cryo-enabled TEM (EP/M028143/1), and most recently a plasma cryo-FIBSEM-with mass spectrometer attachment (EP/V028855/1)). In addition the equipment has attracted numerous industrial consultancy work including studies of nanoparticulate iron supplements that treat anaemia for regulatory body submission (PharmaCosmos and Nemysis) and next generation polymeric, core-shell nanoparticle drug modalities for cancer treatment (AstraZeneca). The suite of instruments will be moved into a state-of-the-art facility with full environmental control in the Bragg Centre for Materials Research in 2023 and will provide a centralised Faculty facility for Materials Characterisation. |
First Year Of Impact | 2016 |
Sector | Pharmaceuticals and Medical Biotechnology |
Impact Types | Societal Economic |
Description | Acted as expert witness in two high court trials involving analysis of medical products by microscopy |
Geographic Reach | National |
Policy Influence Type | Contribution to a national consultation/review |
Impact | Provided expert guidance in data interpretation in two paptent disputes (for GSK in relation to inhalers) and Coloplast (colostomy bags) |
Description | Acoustic control of quantum cascade heterostructures: the THz "S-LASER" |
Amount | £998,933 (GBP) |
Funding ID | EP/V004743/1 |
Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
Sector | Public |
Country | United Kingdom |
Start | 12/2021 |
End | 11/2024 |
Description | Coherent pulse propagation and modelocking in terahertz quantum cascade lasers |
Amount | £1,127,384 (GBP) |
Funding ID | EP/T034246/1 |
Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
Sector | Public |
Country | United Kingdom |
Start | 03/2021 |
End | 02/2024 |
Description | LENNF Facility |
Amount | £200,000 (GBP) |
Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
Sector | Public |
Country | United Kingdom |
Start | 05/2018 |
End | 06/2018 |
Description | Quantum spin Hall effect spintronics |
Amount | £861,847 (GBP) |
Funding ID | EP/T034343/1 |
Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
Sector | Public |
Country | United Kingdom |
Start | 03/2021 |
End | 03/2024 |
Title | Allicona Optical profiler commissioning |
Description | Provides 3D surface profilometry measurements on surface finish including form in a high vertical resolution. |
Type Of Material | Model of mechanisms or symptoms - in vitro |
Provided To Others? | No |
Impact | Surface roughness measurement is important in terms of implant performance for preclinical testing of devices and assessment of damage after testing. |
Title | Ankle simulator commissioning |
Description | Simulation of total ankle replacement wear in vitro |
Type Of Material | Model of mechanisms or symptoms - in vitro |
Provided To Others? | No |
Impact | Ankle specific kinematics and loading available for the first time with physiological and clinically relevant loads and motions. Provides more realistic pre-clinical testing of devices for industry, surgeons, researchers and ultimately patients leading to longer lasting joint replacement implants. |
Title | Assessment of the wear of cartilage using Optical Profilometry |
Description | Measurement of wear of cartilage in natural tissue simulation (cartilage on cartilage) simple configuration and whole joint simulation using optical profilometry. |
Type Of Material | Biological samples |
Provided To Others? | No |
Impact | Presented at conferences, will enable cartilage wear measurement in more detail, more precisely. |
Title | BOSE electroforce instrument commissioning |
Description | Commissioning of BOSE elecroforce testing instrument |
Type Of Material | Model of mechanisms or symptoms - in vitro |
Year Produced | 2016 |
Provided To Others? | Yes |
Impact | BOSE electroforce will allow investigation of mechanical forces on cells cultured in 3D tissue engineered constructs e.g. neural cells in hydrogel scaffolds for spinal cord injury repair - currently in use by EPSRC funded PhD studnets, MSc and undergraduate students from across two faculties. |
Title | Class II cabinet commissioning |
Description | Class II safety cabinet for mammalian cell culture, tissue and organ culture |
Type Of Material | Model of mechanisms or symptoms - in vitro |
Year Produced | 2015 |
Provided To Others? | Yes |
Impact | Provides class II facilities for researchers, PhD students, MSc students and undergraduates from across two faculties. Also used in teaching class for MSc students learning basic cell culture techniques |
Title | Histology equipment and Tissue Processor commisssioning |
Description | Commissioning of tissue processor and histology equipment for tissue engineering research utilising acellular natural scaffolds. |
Type Of Material | Model of mechanisms or symptoms - in vitro |
Year Produced | 2015 |
Provided To Others? | Yes |
Impact | Supports numerous EPSRC funded PhD projects, MSc and undergraduates from across two faculties in the University (faculty of biological sciences and faculty of engineering). |
Title | Data Associated with "The effect of surgical alignment and soft tissue conditions on the kinematics and wear of a fixed bearing total knee replacement" |
Description | Data associated with the paper "The effect of surgical alignment and soft tissue conditions on the kinematics and wear of a fixed bearing total knee replacement". This dataset contains: - Figure 3. The raw data for mean output AP displacement with the 95% CI for each alignment condition under the stiff knee, preserved PCL and resected PCL soft tissue conditions. - Figure 4. The raw data for mean output TR rotation with the 95% CI for each alignment condition under the stiff knee, preserved PCL and resected PCL soft tissue conditions. - Figure 5. The raw data for mean output AA rotation with the 95% CI for each alignment condition under the stiff knee, the preserved PCL and the resected PCL soft tissue conditions. - Figure 6. The raw data for Mean wear rates with 95% CI over 2 MC for the ideal, 4° varus, 14° rotational mismatch and 10° tibial slope alignment conditions for two soft tissue conditions. |
Type Of Material | Database/Collection of data |
Year Produced | 2019 |
Provided To Others? | Yes |
Impact | None |
URL | http://archive.researchdata.leeds.ac.uk/661/ |
Title | Data associated with Scattering in InAs/GaSb Coupled Quantum Wells as a Probe of Higher Order Subband Hybridisation |
Description | We have performed a detailed investigation into the inter-subband scattering within InAs/GaSb coupled quantum wells in the electron dominated regime. By considering the carrier mobilities and the quantum lifetime as a function of carrier density, we find that the occupation of higher order electron-like subbands are inhibited by anticrossing with the hole subbands. We also find that, by applying a gate bias to the GaSb layer, we are able to move the electron-hole anticrossing point in energy, modulating the electron-like states that should be localised within the InAs layer. |
Type Of Material | Database/Collection of data |
Year Produced | 2020 |
Provided To Others? | Yes |
URL | http://archive.researchdata.leeds.ac.uk/700/ |
Title | Data set for paper "Representing the Effect of Variation in Soft Tissue Constraints in Experimental Simulation of Total Knee Replacements" |
Description | Data set for paper "Representing the effect of variation in soft tissue constraints in experimental simulation of total knee replacements". Data includes experimental results from a knee simulator that are represented in the figures and text of the paper. |
Type Of Material | Database/Collection of data |
Year Produced | 2018 |
Provided To Others? | Yes |
Impact | None |
URL | http://archive.researchdata.leeds.ac.uk/id/eprint/400 |
Title | Dataset Associated with 'Deconvolution of Rashba and Dresselhaus spin-orbit coupling by crystal axis dependent measurements of coupled InAs/GaSb quantum wells' |
Description | The Dresselhaus spin-orbit interaction is expected to perturb the quantum spin Hall phase predicted to arise within InAs/GaSb coupled quantum wells. To gain a greater understanding of this interaction, the spin-orbit coupling in two InAs/GaSb coupled quantum well samples, grown along the [001] axis, was investigated along three different in-plane crystallographic axes. By measuring the crystallographic axis dependence of the Dresselhaus spin orbit coupling, we can deconvolute this coupling from the spin splitting arising from axis-invariant Rashba spin-orbit coupling. We find that the Dresselhaus parameter is robust against an external gate bias and small changes in growth conditions, with an associated Dresselhaus parameter of (0.20±0.08)×10^-11 eVm being measured across all samples and top gate bias conditions. In addition, we show that the asymmetries associated with the coupled quantum well structure, leading to Rashba spin-orbit coupling, are likely to play a dominant role in determining the spin-orbit interaction experienced by a quantum spin Hall state as the system is tuned towards charge neutrality. |
Type Of Material | Database/Collection of data |
Year Produced | 2018 |
Provided To Others? | Yes |
Title | Dataset supporting the publication 'A Comprehensive Combined Experimental and Computational Framework for Pre-clinical Wear Simulation of Total Knee Replacements' |
Description | A more robust pre-clinical wear simulation framework is required in order to simulate wider and higher ranges of activities, observed in different patient populations such as younger more active patients. Such a framework will help to understand and address the reported higher failure rates for younger and more active patients (National_Joint_Registry, 2016). The current study has developed and validated a comprehensive combined experimental and computational framework for pre-clinical wear simulation of total knee replacements (TKR). The input mechanical (elastic modulus and Poisson's ratio) and wear parameters and of the moderately cross-linked ultra-high molecular weight polyethylene (UHMWPE) bearing material were independently measured from experimental studies under realistic test conditions, similar to the loading conditions found in the total knee replacements.. The wear predictions from the computational wear simulation were validated against the direct experimental wear measurements for size 3 Sigma curved total knee replacements (DePuy, UK) in an independent experimental wear simulation study under three different daily activities; walking, deep squat, and stairs ascending kinematic conditions. The measured compressive mechanical properties of the moderately cross-linked UHMWPE material were more than 20% lower than that reported in the literature under tensile test conditions. The pin-on-plate wear coefficient of moderately cross-linked UHMWPE was significantly dependant of the contact stress and the degree of cross-shear at the articulating surfaces. The computational wear predictions for the TKR from the current framework were consistent and in a good agreement with the independent full TKR experimental wear simulation measurements, with 0.94 coefficient of determination of the framework. In addition, the comprehensive combined experimental and computational framework was able to explain the complex experimental wear trends from the three different daily activities investigated. Therefore, such a framework can be adopted as a pre-clinical simulation approach to optimise different designs, materials, as well as patient's specific total knee replacements for a range of activities. |
Type Of Material | Database/Collection of data |
Year Produced | 2017 |
Provided To Others? | Yes |
Impact | None |
URL | http://archive.researchdata.leeds.ac.uk/301/ |
Title | Dataset supporting the publication 'A comparison between electromechanical and pneumatic controlled knee simulators for the investigation of wear of total knee replacements' |
Description | More robust pre-clinical experimental wear simulation methods are required in order to simulate a wider range of activities, observed in different patient populations such as younger more active patients, as well as fully meeting and being capable of going well beyond the existing requirements of the relevant international standards. A new six station electromechanically driven simulator (Simulation Solutions, UK) with five fully independently controlled axes of articulation for each station, capable of replicating deep knee bending as well as other adverse conditions, which can be operated in either force or displacement control with improved input kinematic following, has been developed to meet these requirements. This study investigated the wear of a fixed bearing total knee replacement using this electromechanically driven fully independent knee simulator, and compared it to previous data from a predominantly pneumatically controlled simulator in which each station was not fully independently controlled. In addition, the kinematic performance and the repeatability of the simulators have been investigated and compared to the international standard requirements. The wear rates from the electromechanical and pneumatic knee simulators were not significantly different, with wear rates of 2.6 ± 0.9 and 2.7 ± 0.9 [mm3/MC] (mean ± 95% CI, p=0.99) and 5.4 ± 1.4 and 6.7 ± 1.5 [mm3/MC] (mean ± 95% CI, p=0.54) from the electromechanical and pneumatic simulators, under intermediate levels (maximum 5 mm) and high levels (maximum 10 mm) of AP displacements respectively. However, the output kinematic profiles of the control system, which drives the motion of the simulator followed the input kinematic profiles more closely on the electromechanical simulator than the pneumatic simulator. In addition, the electromechanical simulator was capable of following kinematic and loading input cycles within the tolerances of the international standard requirements (ISO 14243-3, 2014). The new generation electromechanical knee simulator with fully independent control has the potential to be used for a much wider range of kinematic conditions, including high-flexion and other severe conditions, due to its improved capability and performance in comparison to the previously used pneumatic controlled simulators. |
Type Of Material | Database/Collection of data |
Year Produced | 2017 |
Provided To Others? | Yes |
Impact | None |
URL | http://archive.researchdata.leeds.ac.uk/131/ |
Description | FEI Titan |
Organisation | FEI company |
Department | FEI United Kingdom |
Country | United Kingdom |
Sector | Private |
PI Contribution | Electron Microscopy of Organic Crystals for Pharmaceutical applications - investigation of methodologies for high resolution imaging and analysis |
Collaborator Contribution | Application of techniques developed for FEI to the study of Pharmaceutical materials |
Impact | Various conference papers and talks so far. Also has involved PhD studentships and consultancy work with AstraZeneca and Haldor Topsoe, Denmark |
Start Year | 2016 |
Description | Quorum Cryo-liftout |
Organisation | Quorum Review- Independent Review Board |
Country | United States |
Sector | Private |
PI Contribution | Collaboration with company Quorum on in-situ liftout of frozen TEM samples |
Collaborator Contribution | Collaboration with company Quorum on in-situ liftout of frozen TEM samples |
Impact | none so far |
Start Year | 2017 |
Description | Annual Royal Microscopical Society School in Elecron Microscopy - every Spring or Summer 2008 onwards |
Form Of Engagement Activity | Participation in an activity, workshop or similar |
Part Of Official Scheme? | No |
Geographic Reach | International |
Primary Audience | Postgraduate students |
Results and Impact | Week long Training School for users of the technique |
Year(s) Of Engagement Activity | 2008,2009,2010,2011,2012,2013,2014,2015,2016,2017,2018,2019,2020,2021 |
Description | BBC Radio 4 interview |
Form Of Engagement Activity | A press release, press conference or response to a media enquiry/interview |
Part Of Official Scheme? | No |
Geographic Reach | International |
Primary Audience | Public/other audiences |
Results and Impact | Interview on Nanogold on BBC Radio 4 Inside Science Broadcast 5 March at 16.30 GMT |
Year(s) Of Engagement Activity | 2020 |
URL | https://www.bbc.co.uk/programmes/m000fw1n |
Description | Be Curious Science Outreach event |
Form Of Engagement Activity | Participation in an open day or visit at my research institution |
Part Of Official Scheme? | No |
Geographic Reach | Regional |
Primary Audience | Schools |
Results and Impact | Microscopy Talk, Activities and Display at Be Curious Festival at University of Leeds, Annual event every March |
Year(s) Of Engagement Activity | 2016,2017,2018,2019,2020 |
URL | http://www.leeds.ac.uk/info/4000/around_campus/460/be_curious_festival-about_leeds_and_yorkshire |
Description | Scientific Organisation of Microscience Microscience Microscopy Congresses MMC2013, 2015, 2017, 2019, 2021 |
Form Of Engagement Activity | Participation in an activity, workshop or similar |
Part Of Official Scheme? | No |
Geographic Reach | International |
Primary Audience | Professional Practitioners |
Results and Impact | Attendance and presentation at conferences |
Year(s) Of Engagement Activity | 2013,2015,2017,2019,2021 |
URL | https://www.mmc-series.org.uk/ |