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New Materials for an Implantable Blood Pump. Rotary blood pumps are at the leading edge of heart assist technology. VentrAssist has developed an innovative rotary blood pump with a hydro-dynamically suspended impeller. Advanced surface modifications will enable the device to be fabricated from polymers; this will make the device light, more compatible with the human body and less costly to produce. Surface treatments and coatings will be applied using ion implantation, to impart the required ....New Materials for an Implantable Blood Pump. Rotary blood pumps are at the leading edge of heart assist technology. VentrAssist has developed an innovative rotary blood pump with a hydro-dynamically suspended impeller. Advanced surface modifications will enable the device to be fabricated from polymers; this will make the device light, more compatible with the human body and less costly to produce. Surface treatments and coatings will be applied using ion implantation, to impart the required dimensional stability, impermeability and wear resistance. Following sophisticated experiments of modified materials, the best candidates will be used in prototype devices, for final selection of the optimal materials for the new device.Read moreRead less
Electrophysiological and Anatomical Characterization of the Coronary Sinus Musculature and its Relationship to the Atria. This series of experiments will characterise the normal coronary sinus musculature and its connectivity to the atria of the heart and establish their electrical relationships. The underlying characteristics of the muscular connections will also be evaluated with a view to possible future manipulations of the system. Understanding normal heart impulse propagation is paramount ....Electrophysiological and Anatomical Characterization of the Coronary Sinus Musculature and its Relationship to the Atria. This series of experiments will characterise the normal coronary sinus musculature and its connectivity to the atria of the heart and establish their electrical relationships. The underlying characteristics of the muscular connections will also be evaluated with a view to possible future manipulations of the system. Understanding normal heart impulse propagation is paramount before we can understand and develop treatments for dealing with heart problems. This information will facilitate the development of techniques to treat and prevent heart rhythm disorders that are a common cause of morbidity in the community.Read moreRead less
Cytorefractometry - a new technique for refractive index tomography of living cells. An ultrahigh-resolution bifocal optical coherence refractometry is proposed, and will result to micron-scale-resolution refractive index tomography of living cells, termed cytorefractometry. This technique represents an extension from bifocal optical coherence refractometry that has recently shown a remarkable promise for direct, several-frames-per-second, motion-artifact-free determination of refractive index ....Cytorefractometry - a new technique for refractive index tomography of living cells. An ultrahigh-resolution bifocal optical coherence refractometry is proposed, and will result to micron-scale-resolution refractive index tomography of living cells, termed cytorefractometry. This technique represents an extension from bifocal optical coherence refractometry that has recently shown a remarkable promise for direct, several-frames-per-second, motion-artifact-free determination of refractive index in turbid media, including biological tissue in vivo. We propose to apply our novel technique to study tissue calcification, a serious problem in cardiology, by making use of the refractive index contrast mechanism. Calcification of smooth muscle cells and aorta subdermal implant models will be studied aiming for prevention of calcification-associated pathologies.Read moreRead less
Regenerating lizard tails: A model for understanding the process of lymphangiogenesis. In humans, impaired lymphatic drainage in limbs causes the debilitating swelling termed lymphoedema. Lymphoedema affects 500,000,000 people worldwide. In the developed world lymphoedema predominantly results from surgery for cancer, and occurs in approximately 25% of breast cancer patients. We will examine lymph vessel regeneration (lymphangiogenesis) in a naturally regenerating, complex structure (the lizard ....Regenerating lizard tails: A model for understanding the process of lymphangiogenesis. In humans, impaired lymphatic drainage in limbs causes the debilitating swelling termed lymphoedema. Lymphoedema affects 500,000,000 people worldwide. In the developed world lymphoedema predominantly results from surgery for cancer, and occurs in approximately 25% of breast cancer patients. We will examine lymph vessel regeneration (lymphangiogenesis) in a naturally regenerating, complex structure (the lizard tail), to describe the regrowth process and determine the abundance, location, functional properties and molecular control of the new lymphatics. Furthermore, if reptilian lymphatic growth factors can promote lymphangiogenesis in mammals, we can design novel therapeutic approaches using reptilian ligands to promote lymphangiogenesis in lymphoedematous human tissues.Read moreRead less
Impact of shear stress on vascular adaptations in humans. Large arteries are important for the delivery of blood and oxygen to organs such as the heart and brain. A primary physiological stimulus which controls the size and function of these crucial arteries is the magnitude of flow or, more accurately, shear force that the inner wall of the artery is exposed to. We have developed novel software which enables non-invasive assessment of arterial wall velocity, diameter and blood flow. We will ass ....Impact of shear stress on vascular adaptations in humans. Large arteries are important for the delivery of blood and oxygen to organs such as the heart and brain. A primary physiological stimulus which controls the size and function of these crucial arteries is the magnitude of flow or, more accurately, shear force that the inner wall of the artery is exposed to. We have developed novel software which enables non-invasive assessment of arterial wall velocity, diameter and blood flow. We will assess the impact of acute and chronic changes in wall flow and shear on arterial size and function. We will also develop new software which measures other aspects of artery wall behaviour. These basic human physiology studies have direct implications for assessment of artery health in humans.Read moreRead less
Defining targets and generating tools/therapeutic agents for prevention, diagnosis and therapy of atherothrombosis. Atherosclerosis and its complications such as myocardial infarction and stroke are a major cause of death and disability in Australia and worldwide. The proposed research program investigates new therapeutic targets and concepts (e.g. targeting of stem cells) to treat atherosclerosis and aims to develop new therapeutic agents using modern biotechnological methods. The project furth ....Defining targets and generating tools/therapeutic agents for prevention, diagnosis and therapy of atherothrombosis. Atherosclerosis and its complications such as myocardial infarction and stroke are a major cause of death and disability in Australia and worldwide. The proposed research program investigates new therapeutic targets and concepts (e.g. targeting of stem cells) to treat atherosclerosis and aims to develop new therapeutic agents using modern biotechnological methods. The project further aims to develop nanoparticle-based diagnostic tools to identify and preventatively treat atherosclerotic plaques that are prone to cause myocardial infarction. The expected outcome will provide direct benefit to patients and create new economic opportunities in Australian bio-/nanotechnology.Read moreRead less
Microwave Differential Imaging of Myocardium for Assessment and Therapeutic Monitoring of Transcatheter Cardiac Ablation. We propose to develop Microwave Imaging techniques for cardiovascular disease diagnosis at 2.45 GHz. Firstly, we aim to image the contrast in the complex dielectric constants of healthy and ischaemic heart tissue. The second aim is to image the extent and efficacy of therapeutic lesion formation due to cardiac ablation modalities. We propose to develop a cylindrical antenna ....Microwave Differential Imaging of Myocardium for Assessment and Therapeutic Monitoring of Transcatheter Cardiac Ablation. We propose to develop Microwave Imaging techniques for cardiovascular disease diagnosis at 2.45 GHz. Firstly, we aim to image the contrast in the complex dielectric constants of healthy and ischaemic heart tissue. The second aim is to image the extent and efficacy of therapeutic lesion formation due to cardiac ablation modalities. We propose to develop a cylindrical antenna array for near field microwave imaging using novel wire antenna elements. Fast and iterative reconstruction algorithms based on electromagnetic scattering and computational techniques will also be developed.Read moreRead less
Noval design of a Bi-Ventricular Assist Device (BVAD) Centrifugal Heart Pump as an Implantable Total Artificial Heart. In Australia, 40%(50,797) of all deaths each year are related to heart disease and accounted for 12% (A$4Billion) of total recurrent health expenditure. This innovative research aims at developing a single biventricular assist device (BVAD) driven by a magnetically suspended double-sided centrifugal pump impeller. Current techniques require two implantable devices, thus preventi ....Noval design of a Bi-Ventricular Assist Device (BVAD) Centrifugal Heart Pump as an Implantable Total Artificial Heart. In Australia, 40%(50,797) of all deaths each year are related to heart disease and accounted for 12% (A$4Billion) of total recurrent health expenditure. This innovative research aims at developing a single biventricular assist device (BVAD) driven by a magnetically suspended double-sided centrifugal pump impeller. Current techniques require two implantable devices, thus preventing smaller patients from access to BVAD technology. The expected outcomes will be a significantly small and compact device and provide an alternative to open-heart transplantation, thus helping to alleviate the demand on donor hearts, as well as the strain on the Australian Heath Care System caused by cardiovascular disease.Read moreRead less
Understanding the cardioprotective effects of flavonols. Heart attack and stroke are a major cause of death and disablement in Australia. Current therapies do not treat the underlying causes of these diseases. In this project we will investigate a promising new drug treatment for these diseases and will determine how this poorly understood drug acts to reduce damage to the heart. This project will lead to new treatments for cardiovascular diseases and will enhance our understanding of the causes ....Understanding the cardioprotective effects of flavonols. Heart attack and stroke are a major cause of death and disablement in Australia. Current therapies do not treat the underlying causes of these diseases. In this project we will investigate a promising new drug treatment for these diseases and will determine how this poorly understood drug acts to reduce damage to the heart. This project will lead to new treatments for cardiovascular diseases and will enhance our understanding of the causes of these disease states.Read moreRead less
Targeting genes elevated in the athlete's heart to improve function of the failing heart. Cardiovascular disease affects about 3.7 million Australians and heart failure ranks as one of the major killers, representing a huge burden on our health care system and economy. This situation is likely to get worse with an increasing ageing population. Current therapeutics for heart failure patients largely delay disease progression but generally fail in significantly improving heart function and quality ....Targeting genes elevated in the athlete's heart to improve function of the failing heart. Cardiovascular disease affects about 3.7 million Australians and heart failure ranks as one of the major killers, representing a huge burden on our health care system and economy. This situation is likely to get worse with an increasing ageing population. Current therapeutics for heart failure patients largely delay disease progression but generally fail in significantly improving heart function and quality of life. The proposal has focused on targeting the protective effects of 'good' heart growth by identifying genes elevated in the heart in response to exercise. Targeting genes elevated in the athlete's heart to improve function of the failing heart represents a new strategy for the treatment of heart failure.Read moreRead less