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Subject = Biomedical Devices and Instrumentation;
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Displaying Results 1 - 25 of 27 on page 1 of 2
Marked
Mark
A Force Measurement Evaluation Tool for Telerobotic Cutting Applications: Development of an Effective Characterization Platform
(2008)
Callaghan, Dean; McGrath, Mark; Coyle, Eugene
A Force Measurement Evaluation Tool for Telerobotic Cutting Applications: Development of an Effective Characterization Platform
(2008)
Callaghan, Dean; McGrath, Mark; Coyle, Eugene
Abstract:
Sensorized instruments that accurately measure the interaction forces (between biological tissue and instrument endeffector) during surgical procedures offer surgeons a greater sense of immersion during minimally invasive robotic surgery. Although there is ongoing research into force measurement involving surgical graspers little corresponding effort has been carried out on the measurement of forces between scissor blades and tissue. This paper presents the design and development of a force measurement test apparatus, which will serve as a sensor characterization and evaluation platform. The primary aim of the experiments is to ascertain whether the system can differentiate between tissue samples with differing mechanical properties in a reliable, repeatable manner. Force-angular displacement curves highlight trends in the cutting process as well the forces generated along the blade during a cutting procedure. Future applications of the test equipment will involve the assessment of ...
https://arrow.dit.ie/engschmanart/2
Marked
Mark
A Mobile ECG Monitoring System with Context Collection
(2009)
Li, Jin Peng; Berry, Damon; Hayes, Richard
A Mobile ECG Monitoring System with Context Collection
(2009)
Li, Jin Peng; Berry, Damon; Hayes, Richard
Abstract:
Preventative health management represents a shift from the traditional approach of reactive treatment-based healthcare towards a proactive wellness-management approach where patients are encouraged to stay healthy with expert support when they need it, at any location and any time. This work represents a step along the road towards proactive, preventative healthcare for cardiac patients. It seeks to develop a smart mobile ECG monitoring system that requests and records context information about what is happening around the subject when an arrhythmia event occurs. Context information about the subject’s activities of daily living will, it is hoped, provide an enriched data set for clinicians and so improve clinical decision making. As a first step towards a mobile cardiac wellness guideline system, the authors present a system which can receive bio-signals that are wirelessly streamed across a body area network from Bluetooth enabled electrocardiographs. The system can store signals ...
https://arrow.dit.ie/teapotcon/24
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Mark
A Wireless and Digital Electrode Bus Topology for Biopotential Measurement
(2012)
Nolan, Mark; Burke, Edward; Coyle, Eugene
A Wireless and Digital Electrode Bus Topology for Biopotential Measurement
(2012)
Nolan, Mark; Burke, Edward; Coyle, Eugene
Abstract:
The conventional biopotential measurement configuration utilises long lead wires which connect measuring electrodes to signal conditioning circuitry. The majority of bioelectric signals that are measured from the human body have a tiny signal amplitude (5µV-5mV range) and thus any interference that is induced on the lead wires can have a detrimental effect on the original signal. In this paper, we present an alternative configuration, in which digitisation occurs on the electrode, potentially providing enhanced signal measurement as well as significant benefits in terms of the simplification of the physical interconnections between electrodes. Multiple electrodes are combined to form a digital electrode bus. This proposed topology represents the next stage in the evolution of bioelectric measurement as, due to the decrease in cost and size of integrated circuits, more of the bioinstrumentation circuitry is shifted away from a base measurement station and into the electrode itself. T...
https://arrow.dit.ie/teapotcon/28
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Mark
Accelerometer Based Measurement for the Mapping of Neck Surface Vibrations During Vocalized Speech
(2009)
Nolan, Mark; Madden, Brian; Burke, Edward
Accelerometer Based Measurement for the Mapping of Neck Surface Vibrations During Vocalized Speech
(2009)
Nolan, Mark; Madden, Brian; Burke, Edward
Abstract:
This paper presents a detailed study of the vibrations on the surface of the neck during a vocalization of predefined fundamental frequency and intensity. This study was carried out as part of a wider investigation into the use of laryngeal vibrations as a channel of communication. Another potential application of this study is in identifying a suitable location for a hands-free electro-larynx for laryngectomees. An analog accelerometer, with dimensions 5x5x1.6mm and of mass 80mg, was used to perform the measurements. It was connected to a 12-bit analog-to-digital converter via single strands of insulated wire with a diameter of 100μm. The resulting low inertia of the measuring device minimized the effect of the measuring device on the phenomenon under investigation. The analog-to-digital converter simultaneously sampled the accelerometer output and a pre-amplified audio signal from a microphone. This preliminary study was carried out on two able-bodied male subjects. Measurements w...
https://arrow.dit.ie/teapotcon/6
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Mark
Accelerometer Based Measurement of Body Movement for Communication, Play, and Creative Expression
(2008)
Nolan, Mark; Burke, Edward; Duignan, Frank
Accelerometer Based Measurement of Body Movement for Communication, Play, and Creative Expression
(2008)
Nolan, Mark; Burke, Edward; Duignan, Frank
Abstract:
This paper presents a newly designed wireless accelerometer-based movement measurement device. The device is capable of measuring activity ranging from gross body movements to more subtle vibrations emanating from the body, including laryngeal vibration and the mechanomyogram (mechanical vibrations from working muscles). The main body of the device, which is less than 20cm3 in volume and weighs less than 50g, contains a microcontroller, wireless transceiver, battery, and one accelerometer. A supplementary accelerometer module is connected to the main device by thin wires. This module is very light weight and can therefore be directly attached to the skin to measure laryngeal vibration, mechanomyogram, or cardiac muscle movement. The prototype device has been initially applied to facilitating play and creative expression by children with physical disabilities. For this purpose, the main module was adapted to be worn behind the ear while the supplementary accelerometer module is attac...
https://arrow.dit.ie/teapotcon/5
Marked
Mark
An Analysis of the Performance of Foams Used in Hurling Helmets
(2008)
Norris, Keith; Tiernan, Stephen
An Analysis of the Performance of Foams Used in Hurling Helmets
(2008)
Norris, Keith; Tiernan, Stephen
Abstract:
Abstract Head injuries can occur in most sporting activities. The seriousness of these injuries can vary greatly depending on the sport. Many sports such as American football, cricket, baseball and hurling try to reduce this risk by designing helmets that are suitable to be worn by the players. The National Standard Authority of Ireland (NSAI) has recently made great strides in this area with the introduction of the first comprehensive standard adopted for the sport I.S. 355:2006, which sets out new testing procedures that all new helmets must meet. The Gaelic Athletic Association (GAA) has also stated its intention to make the wearing of sports helmets compulsory up to minor level. The hope is that in time all the players will become comfortable with wearing helmets which has been found to be a major reason for the current low wear rates. [2] This paper covers the testing and modelling of energy absorbing materials to ascertain the optimum thickness, and density of foam within the ...
https://arrow.dit.ie/ittengcon/2
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Mark
An Engineering Evaluation of Ankle Prosthetics
(2008)
Thian, Christopher; Tiernan, Stephen; McEvoy, Fiona; Flavin, Robert
An Engineering Evaluation of Ankle Prosthetics
(2008)
Thian, Christopher; Tiernan, Stephen; McEvoy, Fiona; Flavin, Robert
Abstract:
There are a wide range of different types of ankle replacements on the market today each with adifferent mechanical design. Unfortunately the results of ankle replacements are not as good as hipand knee replacements; this is due to the complexity of the ankle joint. In the early days of anklereplacements some of the prosthetics only lasted 4 months. Recent developments have improved thelongevity of the replacements although, there are still many complications and failures of thereplacements, these include; the prosthetic components migrating into the bone, the componentsfailing due to stresses induced by the forces and the surgery itself i.e. the incision site.This paper will analyse the documented medical failures of the replacements from a mechanicalengineering perspective. Three ankle prosthetics are investigated in this paper: the Buechel-Pappas,the Scandinavian Total Ankle Replacement (STAR) and the Hintegra ankle replacement. Medicalpublications are examined to isolate the mec...
https://arrow.dit.ie/ittengcon/3
Marked
Mark
An Investigation of the use of a High Resolution ADC as a Digital Biopotential Amplifier
(2009)
Berry, Damon; Duignan, Frank; Hayes, Richard
An Investigation of the use of a High Resolution ADC as a Digital Biopotential Amplifier
(2009)
Berry, Damon; Duignan, Frank; Hayes, Richard
Abstract:
Sigma delta analogue to digital converters have been used in many signal processing applications including some commercially available systems for sampling of bio-signals Bio-potential amplifiers have traditionally utilised specialised highquality analogue components to amplify bio-signals. The central aim of this work is to investigate the benefits of using high-resolution sigma delta conversion as a digital amplification stage in the signal path of a bio-potential amplifier. A number of system arrangements specific to bio-potential measurement are presented and discussed. These arrangements are designed to use the high resolution capacity of the sigma delta converter in different ways, providing different benefits. To explore these benefits, the authors have implemented a digital bio-potential signal capture system consisting of a sigma delta converter interfaced to a PC running MATLAB via an inexpensive microcontroller and to test it with a number of test signals. A signal gener...
https://arrow.dit.ie/teapotcon/22
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Mark
Analysis of Strain Transfer to FBG’s for Sensorized Telerobotic End-effector Applications
(2009)
Callaghan, Dean; McGrath, Mark; Rajan, Ginu; Coyle, Eugene; Semenova, Yuliya; Farrell, ...
Analysis of Strain Transfer to FBG’s for Sensorized Telerobotic End-effector Applications
(2009)
Callaghan, Dean; McGrath, Mark; Rajan, Ginu; Coyle, Eugene; Semenova, Yuliya; Farrell, Gerald
Abstract:
Sensorized instruments which cater for the measurement of interaction forces during surgical procedures are not available on current commercial Minimally Invasive Robotic Surgical (MIRS) systems. This paper investigates the ef-fectiveness of advanced optical sensing technology (Fiber Bragg Grating) as sur-gical end effector strain/force sensors. The effects of adhesive bonding layer thickness and length are specifically addressed owing to their importance for ef-fective strain transfer and ensuring compactness of the resulting sensing arrange-ment. The strain transfer characteristics of the compound sensing arrangement are evaluated by the examination of shear transfer through the fiber coating and adhe-sive layers. Detailed analysis of the sensing scheme is facilitated through the use of FEA. Validation of the resulting models is achieved through experimentation carried out on an application-specific evaluation platform. Results show that strain values from an FBG are comparable to...
https://arrow.dit.ie/engschmanbk/1
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Mark
Arterial Tissue Perforation Using Ultrasonically Vibrating Wire Waveguides
(2011)
Wylie, Mark
Arterial Tissue Perforation Using Ultrasonically Vibrating Wire Waveguides
(2011)
Wylie, Mark
Abstract:
Chronic Total Occlusions (CTOs) are fibrous and calcified atherosclerotic lesions which completely occlude the artery. They are difficult to treat with standard dilation procedures as they cannot be traversed easily. Their treatment is also associated with a high risk of arterial perforation. Low frequency ultrasonic vibrations delivered via wire waveguides represent a minimally invasive treatment for CTOs and other tissue ablation applications. These devices typically operate at 20–50 kHz delivering wire waveguide distal tip amplitudes of vibration of 0-60 μm. The diseased tissue is ablated or disrupted by repetitive direct mechanical contact and cavitation. This research assesses the susceptibility of arterial tissue to perforation and residual damage under the action of ultrasonically energised wire waveguides. Using Finite Element Analysis (FEA), a linear acoustic model of the wire waveguide distal tips can predict the pressures for a range of operating parameters typically used...
https://arrow.dit.ie/engdoc/48
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Mark
Augmented Control of a Hands-Free Electrolarynx
(2011)
Madden, Brian; Condron, James; Coyle, Eugene
Augmented Control of a Hands-Free Electrolarynx
(2011)
Madden, Brian; Condron, James; Coyle, Eugene
Abstract:
During voiced speech, the larynx acts as the sound source, providing a quasi-periodic excitation of the vocal tract. Following a total laryngectomy, some people speak using an electrolarynx which employs an electromechanical actuator to perform the excitatory function of the absent larynx. Drawbacks of conventional electrolarynx designs include the monotonic sound emitted, the need for a free-hand to operate the device, and the difficulty experienced by many laryngectomees in adapting to its use. One improvement to the electrolarynx, which clinicians and users frequently suggest, is the provision of a convenient hands-free control facility. This would allow more natural use of body language, as well as enabling the user to perform other manual tasks whilst speaking. An additional enhancement is the redevelopment of the devices' actuator to remove the self-radiated buzzing sound which is emitted during operation. The overall goal of this research is to investigate the implementa...
https://arrow.dit.ie/teapotcon/18
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Mark
Collagen and Elastin based Tissue Engineered Vascular Grafts
(2016)
Ryan, Alan J
Collagen and Elastin based Tissue Engineered Vascular Grafts
(2016)
Ryan, Alan J
Abstract:
<p>Cardiovascular disease is the leading cause of death worldwide, accounting for 29% of all global deaths and is set to rise to 23 million deaths a year by 2030 (World Health Organisation, 2012). Arterial bypassing, both peripheral and coronary, is usually performed with autologously harvested vessels. However, the quantity available is often very limited as well as the vessels of elderly patients often suffering from thrombus, aneurysm formation or arthrosclerosis in high pressure arterial sites. The shortcomings of autografts has led to a substantial amount of research being directed towards tissue engineered vascular grafts (TEVGs) (Kakisis et al., 2005). Currently available artificial grafts for small diameter vasculature (mm) suffer from poor patency rates due to thrombosis, aneurysm formation, and a compliance mismatch, which often stems from the inherent properties of synthetic polymers.</p> <p>The primary goal of the research presented in this thesis was t...
https://epubs.rcsi.ie/phdtheses/177
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Mark
Comparing FBG and PCF Force Sensors in a Laparoscopic Smart Surgical Scissor Instrument
(2011)
Callaghan, Dean; Rajan, Ginu; McGrath, Mark; Coyle, Eugene; Semenova, Yuliya; Farrell, ...
Comparing FBG and PCF Force Sensors in a Laparoscopic Smart Surgical Scissor Instrument
(2011)
Callaghan, Dean; Rajan, Ginu; McGrath, Mark; Coyle, Eugene; Semenova, Yuliya; Farrell, Gerald
Abstract:
This paper presents a sensorized laparoscopic surgical scissor instrument using both a fiber Bragg grating (FBG) and a tapered photonic crystal fiber (PCF) as force sensors. The sensors are located on the blades for the detection of interaction forces generated between the instrument and tissue during cutting. The force sensitivity of each sensorized blade is examined. Results show that the scissor blade-PCF sensor arrangement outperforms the blade with the FBG during static loading calibration experimentation. Moreover, experiments show that the PCF based arrangement is less sensitive to temperature effects than its FBG counterpart. This negates the need for additional temperature compensation sensors and techniques. The PCF sensor was shown to have higher strain measurement sensitivity (2 pm/με) than the FBG sensor (1.2pm/με).
https://arrow.dit.ie/engschmanconn/26
Marked
Mark
Force Measurement and Evaluation for Surgical Cutting Applications: Development of an Effective Characterisation Testbed
(2008)
Callaghan, Dean
Force Measurement and Evaluation for Surgical Cutting Applications: Development of an Effective Characterisation Testbed
(2008)
Callaghan, Dean
Abstract:
Sensorized instruments that cater for accurate measurement of the interaction forces (between biological tissue and instrument end-effector) during surgical procedures offer surgeons a greater sense of immersion during minimally invasive robotic surgery (MIRS). There is much ongoing research into force measurement/evaluation involving surgical graspers. However, comparatively little corresponding effort has been expended in the measurement and subsequent evaluation of forces between scissor blades and tissue. This paper presents the design and development of a force/strain measurement test apparatus, which will ultimately serve as an effective sensor characterisation and evaluation platform. Data acquired from the testing platform can be used to differentiate between tissue samples with differing mechanical properties in a reliable, repeatable manner. PVA cryogel samples which have been exposed to differing freeze-thaw cycles, giving properties similar to those of biological tissue ...
https://arrow.dit.ie/engschmanconn/20
Marked
Mark
Force Measurement Methods in Telerobotic Surgery: Implications for End-Effector Manufacture
(2008)
Callaghan, Dean; McGrath, Mark; Coyle, Eugene
Force Measurement Methods in Telerobotic Surgery: Implications for End-Effector Manufacture
(2008)
Callaghan, Dean; McGrath, Mark; Coyle, Eugene
Abstract:
Haptic feedback in telesurgical applications refers to the relaying of position and force information from a remote surgical site to the surgeon in real-time during a surgical procedure. This feedback, coupled with visual information via microscopic cameras, has the potential to provide the surgeon with additional ‘feel’ for the manipulations being performed at the instrument-biological tissue interface. This increased sensitivity has many associated benefits which include, but are not limited to; minimal tissue damage, reduced recuperation periods, and less patient trauma. The inclusion of haptic feedback leads to reduction in surgeon fatigue which contributes to enhanced performance during operation. Commercially available Minimally Invasive Robotic Surgical (MIRS) systems are being widely used, the best-known examples being from the daVinci® by Intuitive Surgical Inc. However, currently these systems do not possess force feedback capability which therefore restricts their use dur...
https://arrow.dit.ie/biomart/2
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Mark
Force Sensing Surgical Scissor Blades using Fibre Bragg Grating Sensors
(2013)
Callaghan, Dean
Force Sensing Surgical Scissor Blades using Fibre Bragg Grating Sensors
(2013)
Callaghan, Dean
Abstract:
This thesis considers the development and analysis of unique sensorised surgical scissor blades for application in minimally invasive robotic surgery (MIRS). The lack of haptic (force and tactile) feedback to the user is currently an unresolved issue with modern MIRS systems. This thesis presents details on smart sensing scissor blades which enable the measurement of instrument-tissue interaction forces for the purpose of force reflection and tissue property identification. A review of current literature established that there exists a need for small compact, biocompatible, sterilisable and robust sensors which meet the demands of current MIRS instruments. Therefore, the sensorised blades exploit the strain sensing capabilities of a single fibre Bragg grating (FBG) sensor bonded to their surface. The nature and magnitude of the strain likely to be experienced by the blades, and consequently the FBG sensor, while cutting soft tissue samples were characterised through the use of an ap...
https://arrow.dit.ie/engdoc/59
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Mark
High Power, Low Frequency Ultrasound: Meniscal Tissue Interaction and Ablation Characteristics
(2011)
O'Daly, Brendan; Morris, Edmund; Gavin, Graham; Keane, Conor; O Byrne, John; McGui...
High Power, Low Frequency Ultrasound: Meniscal Tissue Interaction and Ablation Characteristics
(2011)
O'Daly, Brendan; Morris, Edmund; Gavin, Graham; Keane, Conor; O Byrne, John; McGuinness, Garrett
Abstract:
Abstract—This study evaluates high power low frequency ultrasound transmitted via a flat vibrating probe tip as an alternative technology for meniscal debridement in the bovine knee. An experimental force controlled testing rig was constructed using a 20 kHz ultrasonic probe suspended vertically from a load cell. Effect of variation in amplitude of distal tip displacement (242–494 mm peak-peak) settings and force (2.5–4.5 N) on tissue removal rate (TRR) and penetration rate (PR) for 52 bovine meniscus samples was analyzed. Temperature elevation in residual meniscus was measured by embedded thermocouples and histologic analysis. As amplitude or force increases, there is a linear increase in TRR (Mean: 0.9 to 11.2 mg/s) and PR (Mean: 0.08 to 0.73 mm/s). Maximum mean temperatures of 84.6C and 52.3C were recorded in residual tissue at 2 mm and 4 mm from the ultrasound probe-tissue interface. There is an inverse relationship between both amplitude and force, and temperature elevation, wi...
https://arrow.dit.ie/engschmanart/12
Marked
Mark
In-Silico Hyperthermia Performance of a Near-Field Patch Antenna at Various Positions on a Human Body Model
(2011)
Curto, Sergio; See, Terrence; McEvoy, Patrick; Ammann, Max; Chen, Zhi Ning
In-Silico Hyperthermia Performance of a Near-Field Patch Antenna at Various Positions on a Human Body Model
(2011)
Curto, Sergio; See, Terrence; McEvoy, Patrick; Ammann, Max; Chen, Zhi Ning
Abstract:
A compact patch applicator designed to enhance targeted energy coupling at 434 MHz is a key enabler for sensitizing temperature increments in body regions containing superficial tumours. A detailed FDTD body model is used to explore simulated RF coupling and temperature increments for typical clinical conditions. The antenna impedance matching, specific absorption rate and thermal distribution parameters are evaluated to identify applied performance outcomes. The analysis reveals physiological-RF coupling patterns for an optimised closely-coupled single element applicator.
https://arrow.dit.ie/ahfrcart/22
Marked
Mark
Intelligibility of Electrolarynx Speech Using a Novel Actuator
(2010)
Madden, Brian; Nolan, Mark; Burke, Ted; Condron, James; Coyle, Eugene
Intelligibility of Electrolarynx Speech Using a Novel Actuator
(2010)
Madden, Brian; Nolan, Mark; Burke, Ted; Condron, James; Coyle, Eugene
Abstract:
During voiced speech, the larynx provides quasi-periodic acoustic excitation of the vocal tract. Following a laryngectomy, some people speak using an electrolarynx which replaces the excitatory function of the absent larynx. Drawbacks of conventional electrolarynx designs include the buzzing monotonic sound emitted, the need for a free hand to operate the device, and difficulty experienced by many laryngectomees in adapting to its use. Despite these shortcomings, it remains the preferred method of speech rehabilitation for a substantial minority of laryngectomees. In most electrolarynxes, mechanical vibrations are produced by a linear electromechanical actuator, the armature of which percusses against a metal or plastic plate at a frequency within the range of glottal phonation. As part of the ongoing development of a hands-free alternative to the conventional electrolarynx, the authors have developed a novel actuator which is based on a lightweight pager motor similar to those used...
https://arrow.dit.ie/teapotcon/13
Marked
Mark
Intelligibility of Electrolarynx Speech using a Novel Hands-Free Actuator
(2011)
Madden, Brian; Nolan, Mark; Burke, Ted; Condron, James; Coyle, Eugene
Intelligibility of Electrolarynx Speech using a Novel Hands-Free Actuator
(2011)
Madden, Brian; Nolan, Mark; Burke, Ted; Condron, James; Coyle, Eugene
Abstract:
During voiced speech, the larynx provides quasi-periodic acoustic excitation of the vocal tract. In most electrolarynxes, mechanical vibrations are produced by a linear electromechanical actuator, the armature of which percusses against a metal or plastic plate at a frequency within the range of glottal excitation. In this paper, the intelligibility of speech produced using a novel hands-free actuator is compared to speech produced using a conventional electrolarynx. Two able-bodied speakers (one male, one female) performed a closed response test containing 28 monosyllabic words, once using a conventional electrolarynx and a second time using the novel design. The resulting audio recordings were randomized and replayed to ten listeners who recorded each word that they heard. The results show that the speech produced using the hands-free actuator was substantially more intelligible to the majority of listeners than that produced using the conventional electrolarynx. The new actuator ...
https://arrow.dit.ie/teapotcon/10
Marked
Mark
Multimodal Wearable Sensors for Human-Machine Interfaces
(2013)
Nolan, Mark
Multimodal Wearable Sensors for Human-Machine Interfaces
(2013)
Nolan, Mark
Abstract:
Certain areas of the body, such as the hands, eyes and organs of speech production, provide high-bandwidth information channels from the conscious mind to the outside world. The objective of this research was to develop an innovative wearable sensor device that records signals from these areas more conveniently than has previously been possible, so that they can be harnessed for communication. A novel bioelectrical and biomechanical sensing device, the wearable endogenous biosignal sensor (WEBS), was developed and tested in various communication and clinical measurement applications. One ground-breaking feature of the WEBS system is that it digitises biopotentials almost at the point of measurement. Its electrode connects directly to a high-resolution analog-to-digital converter. A second major advance is that, unlike previous active biopotential electrodes, the WEBS electrode connects to a shared data bus, allowing a large or small number of them to work together with relatively fe...
https://arrow.dit.ie/engdoc/67
Marked
Mark
Novel Bioelectrical Measurement using a Digital Biopotential Monode
(2011)
Nolan, Mark; Burke, Edward; Coyle, Eugene
Novel Bioelectrical Measurement using a Digital Biopotential Monode
(2011)
Nolan, Mark; Burke, Edward; Coyle, Eugene
Abstract:
In conventional biopotential recording, two or more electrodes are placed on the body. A unipolar lead records the time-varying electrical potential at a single point (relative to a reference potential) via one signal electrode. A bipolar lead records the time-varying potential difference between two points via two signal electrodes. In each case, the signal electrodes are connected to high impedance amplifier inputs, while an additional electrode provides a low-impedance path between the amplifier and human subject. Bipolar leads are usually preferred since interference appearing at both signal electrodes can be eliminated using an instrumentation amplifier with high CMRR. A drawback of bipolar lead recording is that wires must connect all electrodes to the amplifier. This paper presents preliminary work on a novel design for a digital biopotential measurement device which we call the biopotential monode.
https://arrow.dit.ie/teapotcon/21
Marked
Mark
On Improving Electrooculogram-Based Computer Mouse Systems: The Accelerometer Trigger
(2011)
Keegan, Johnalan; Burke, Edward; Condron, James; Coyle, Eugene
On Improving Electrooculogram-Based Computer Mouse Systems: The Accelerometer Trigger
(2011)
Keegan, Johnalan; Burke, Edward; Condron, James; Coyle, Eugene
Abstract:
Eye tracking is a well-established method of computer control for profoundly paralysed people (Anson et al., 2002). Cameras are commonly used to track eye movements (Morimoto et al., 2005) but one alternative is the bioelectrical signal known as the electrooculogram (EOG). There are some EOG mouse control systems that facilitate the use of GUI applications, but certain actions, which are straightforward using a conventional mouse, remain impossible. Unless the eyes are tracking a target, they move in saccades (jumps), making it impossible to voluntarily trace out smooth trajectories with one's gaze, as would be required to draw a smooth curve. The conventional paradigm for EOG mouse control maps horizontal and vertical angular displacement of the eyes onto the coordinates of the mouse pointer (Gips et al. and Estrany et al., 2008), while the head remains stationary. Reversing this paradigm, if the point of fixation remains unchanged, the EOG can measure head movement. The prese...
https://arrow.dit.ie/teapotcon/19
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Mark
Oxygen Transport in Cartoid and Stented Coronary Arteries
(2017)
Murphy, Eoin A
Oxygen Transport in Cartoid and Stented Coronary Arteries
(2017)
Murphy, Eoin A
Abstract:
Oxygen deficiency, known as hypoxia, in arterial walls has been linked to increased intimal hyperplasia, which is the main adverse biological process causing in-stent restenosis. Stent implantation can have significant effects on the oxygen transport into the arterial wall. Helical flow has been theorised to improve the local haemodynamics and the oxygen transport within stented arteries. In this study an advanced oxygen transport model was developed to assess different stent designs. This advanced oxygen transport model incorporates both the free and bound oxygen contained in blood and includes a shear-dependent dispersion coefficient for red blood cells. In two test cases undertaken the results predicted by the advanced oxygen transport model were compared those predicted by simpler models, and in vivo measurements. Two other test cases analysed the predicted oxygen transport in three different stent designs, and the effects of helical flow on the haemodynamics and oxygen transpor...
https://arrow.dit.ie/engdoc/99
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Mark
Techniques for Investigation of Surgical Cutting Instruments
(2004)
Price, Eamon; Reilly, Ger; McCormack, Brendan; Macey, Andrew
Techniques for Investigation of Surgical Cutting Instruments
(2004)
Price, Eamon; Reilly, Ger; McCormack, Brendan; Macey, Andrew
https://arrow.dit.ie/engschmanconn/11
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