| 1. |
- Andersson, Roger, 1967-, et al.
(författare)
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An asymmetric dialysis tube as an integrated part of a pressure-monitoring sensor
- 2001
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Ingår i: Technology and Health Care. - 0928-7329 .- 1878-7401. ; 9:5, s. 417-425
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Tidskriftsartikel (refereegranskat)abstract
- A sensor has been designed consisting of a tube holder with a force transducer and a tube with a modified cross-section. The holder has a lid that encloses the tube. By having a stiff holder and a compliant tube, the idea is that the intraluminal pressure in the tube can be obtained from the measured force. The method is intended for non-invasive pressure measurements in blood or dialysate tubes.We have used a tube cross-sectional geometry where the outer surface is elliptic and the inner surface is circular with a relation of 2:1 between the thinnest and thickest tube sides. The pressure transducer system shows a linear relationship between the applied pressure and the sensor output (r = 0.999). Within the temperature range, 32°–36°C, which corresponds to the blood and dialysate temperatures, the sensor accuracy is within ±0.8 kPa (±6 mm Hg). This indicates that the sensor should be clinically useful during dialysis and similar applications.
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| 2. |
- Andersson, Roger, 1967-, et al.
(författare)
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Cross-sectional changes in an asymmetric tube with bearing on non-invasive pressure measurements
- 2003
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Ingår i: Technology and Health Care. - 0928-7329 .- 1878-7401. ; 11:1, s. 11-20
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Tidskriftsartikel (refereegranskat)abstract
- This study aims at investigating the radial dimensional changes, as a result of an applied intraluminal pressure for an elastic tube with non-uniform cross section. The study is related to a method for non-invasive pressure measurement using the extracorporeal tube as part of the sensor. The intended application is for monitoring of pressure in the blood and dialysate tubes during haemodialysis. The intention is to find a tube cross-section geometry that results in an expansion of the tube so that it is suitable to use as a component in a pressure sensor. The tube should have high radial compliance and expand in a well-defined manner to be able to transfer the intraluminal pressure to a transducer element sensing the radial force. Radial expansion was studied experimentally for tubes with different cross-section geometries. For small tube expansions the resolution in the experimental measurements was not sufficient to study the radial expansion. In this case, numerical simulation was performed. We conclude that a tube with essentially elliptic outer surface and circular inner surface, with a relation of 1:2 between the size of the thin and thick wall, results in a radial expansion upon application of pressure indicating that this tube is suitable for use as part of a sensor.
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| 3. |
- Brorsson, Sofia, 1973-, et al.
(författare)
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A new force measurement device for evaluating finger extension function in the healthy and rheumatoid arthritis hand
- 2008
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Ingår i: Technology and Health Care. - Amsterdam : IOS Press. - 0928-7329 .- 1878-7401. ; 16:4, s. 283-292
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Tidskriftsartikel (refereegranskat)abstract
- Although often neglected, finger extension force is of great importance for developing grip strength. This paper describes the design and evaluation of a new finger extension force measurement device (EX-it) based on the biomechanics of the hand. Measurement accuracy and test-retest reliability were analysed. The device allows measurements on single fingers as well as all the fingers (excluding the thumb) of both healthy and deformed hands. The coefficient of variation in the device was 1.8% of the applied load, and the test-retest reliability showed a coefficient of variation no more than 7.1% for healthy subjects. This study also provides reference values for finger extension force in healthy subjects and patients with rheumatoid arthritis (RA). Significant differences were found in extension strength between healthy subject and RA patients (men, p < 0.05 and women, p < 0.001). EX-it provides objective and reliable data on the extension force capacity of normal and dysfunctional hands and can be used to evaluate the outcome of therapeutic interventions after hand trauma or disease
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| 4. |
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| 5. |
- Herzog, Almut, 1969-, et al.
(författare)
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Network solutions for home health care applications
- 2003
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Ingår i: Technology and Health Care. - : IOS Press. - 0928-7329 .- 1878-7401. ; 11:2, s. 77-87
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Tidskriftsartikel (refereegranskat)abstract
- The growing number of the elderly in industrialised countries is increasing the pressure on respective health care systems. This is one reason for recent trends in the development and expansion of home health care organisations. With Internet access available to everyone and the advent of wireless technologies, advanced telehomecare is a possibility for a large proportion of the population.In the near future, one of the authors plans to implement a home health care infrastructure for patients with congestive heart failure and patients with chronic obstructive pulmonary disease. The system is meant to support regular and ad-hoc measurements of medical parameters in patient homes and transmission of measurement data to the home health care provider.In this paper we look at network technologies that connect sensors and input devices in the patient home to a home health care provider. We consider wireless and Internet technologies from functional and security-related perspectives and arrive at a recommendation for our system.Security and usability aspects of the proposed network infrastructures are explored with special focus on their impact on the patient home.
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| 6. |
- Hult, Peter, 1964-, et al.
(författare)
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An improved bioacoustic method for monitoring of respiration
- 2004
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Ingår i: Technology and Health Care. - 0928-7329 .- 1878-7401. ; 12:4, s. 323-332
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Tidskriftsartikel (refereegranskat)abstract
- Reliable monitoring of respiration plays an important role in a broad spectrum of applications. Today, there are several methods for monitoring respiration, but none of them has proved to be satisfactory in all respects. We have recently developed a bioacoustic method that can accurately time respiration from tracheal sounds. The aim of this study is to tailor this bioacoustic method for monitoring purposes by introducing dedicated signal processing. The method was developed on a material of ten patients and then tested in another ten patients treated in an intensive care unit. By studying the differences in the variation of the spectral content between the different phases of respiration, the described method can distinguish between inspiration and expiration and can extract respiration frequency, and respiration pause periods. The system detected 98% of the inspirations and 99% of the expirations. This method for respiration monitoring has the advantage of being simple, robust and the sensor does not need to be placed closed to the face. A commercial heart microphone was used and we anticipate that further improvement in performance can be achieved trough optimization of sensor design.
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| 7. |
- Johansson, Annette M., et al.
(författare)
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Views of residents of rural areas on accessibility to specialist care through videoconference
- 2014
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Ingår i: Technology and Health Care. - 0928-7329 .- 1878-7401. ; 22:1, s. 147-155
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Accessibility to specialized health care is important for residents in rural areas. Videoconsultation can provide increased accessibility to health care. Before implementation of new technologies, it is important to study residents' views.OBJECTIVE: This study describes views of residents of rural areas on accessibility to specialist care and the use of videoconsultation as tool to increase accessibility.METHOD: A questionnaire was distributed via the primary health care centres in rural areas of northern Sweden. Data was analysed with both quantitative and qualitative methods.RESULTS: The quantitative analysis revealed three main areas: savings in time, environmental damage and cost of not having to travel were important; security of information must be coupled with increased availability of specialist care; responses depended on an individual's specific health care needs. The open-ended answers resulted into two categories: 1) experiences related to availability of specialist care and 2) views on participating in VC.CONCLUSION: Despite the fact that rural residents considered the distance as important factor in access to care, there was uncertainty regarding videoconsultation as solution. Although respondents were familiar with different types of communication technologies, they probably hesitated because they did not have information on what videoconsultation would mean to them.
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| 8. |
- Khan, Taha, 1983-, et al.
(författare)
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A novel method for automatic classification of Parkinson gait severity using front-view video analysis
- 2021
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Ingår i: Technology and Health Care. - Amsterdam : IOS Press. - 0928-7329 .- 1878-7401. ; 29:4, s. 643-653
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Gait impairment is an essential symptom of Parkinson’s disease (PD). OBJECTIVE: This paper introduces a novel computer-vision framework for automatic classification of the severity of gait impairment using front-view motion analysis. METHODS: Four hundred and fifty-six videos were recorded from 19 PD patients using an RGB camera during clinical gait assessment. Gait performance in each video was rated by a neurologist using the unified Parkinson’s disease rating scale for gait examination (UPDRS-gait). The proposed algorithm detects and tracks the silhouette of the test subject in the video to generate a height signal. Gait features were extracted from the height signal. Feature analysis was performed using the Kruskal-Wallis rank test. A support vector machine was trained using the features to classify the severity levels according to UPDRS-gait in 10-fold cross-validation. RESULTS: Features significantly (p< 0.05) differentiated between median-ranks of UPDRS-gait levels. The SVM classified the levels with a promising area under the ROC of 80.88%. CONCLUSION: Findings support the feasibility of this model for Parkinson’s gait assessment in the home environment. © 2021 - IOS Press. All rights reserved.
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| 9. |
- Larsby, Birgitta, 1950-, et al.
(författare)
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A system for recording of auditory evoked responses
- 2000
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Ingår i: Technology and Health Care. - 0928-7329 .- 1878-7401. ; 8, s. 315-326
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Tidskriftsartikel (refereegranskat)abstract
- A system for recording of evoked potentials from auditory stimulation was developed. The system consists of a PC equipped with an audio bandwidth board with analog input and output channels. The sound stimulus signal is generated in the computer, D/A converted, and via audio amplifier fed to earphones on the test subject. Auditory evoked potentials in response to sound stimuli are recorded via electrodes, amplified and filtered in an EEG recording system and fed to an A/D converter. The signal is analysed in the PC. The modular design of the program makes it a flexible system where stimulus and recording parameters can easily be modified and new applications can be added to standard clinical measurements.Three applications that are not possible with commercially available systems were developed and evaluated. a) A diagnostic procedure to verify hydrops in patients with Meniere's disease. b) Intraoperative recordings of auditory evoked potentials during neurootological surgery. c) Recording of mismatch negativity (MMN) potentials in evaluation of central auditory functions.
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| 10. |
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