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Guo, Li
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Publications (10 of 22) Show all publications
Sandsjö, L. & Guo, L. (2018). Scan-to-knit - A platform for personalised smart textiles research and develoment with a special focus on prosthetics. In: Madeleine Lowery (Ed.), ISEK 2018 - The XXII Congress of the International Society of Electrophysiology and Kinesiology: University College Dublin, Dublin, Ireland, June 30th - 2nd July, 2018. Paper presented at ISEK 2018 - The XXII Congress of the International Society of Electrophysiology and Kinesiology, Dublin, June 30th - 2nd July, 2018 (pp. 222-223). Dublin: University College Dublin Press
Open this publication in new window or tab >>Scan-to-knit - A platform for personalised smart textiles research and develoment with a special focus on prosthetics
2018 (English)In: ISEK 2018 - The XXII Congress of the International Society of Electrophysiology and Kinesiology: University College Dublin, Dublin, Ireland, June 30th - 2nd July, 2018 / [ed] Madeleine Lowery, Dublin: University College Dublin Press, 2018, p. 222-223Conference paper, Poster (with or without abstract) (Refereed)
Place, publisher, year, edition, pages
Dublin: University College Dublin Press, 2018
National Category
Medical Materials
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-14613 (URN)
Conference
ISEK 2018 - The XXII Congress of the International Society of Electrophysiology and Kinesiology, Dublin, June 30th - 2nd July, 2018
Funder
Knowledge Foundation, 20160030
Available from: 2018-07-09 Created: 2018-07-09 Last updated: 2018-07-11Bibliographically approved
Guo, L. & Sandsjö, L. (2017). Scan To Knit - A smart textile platform for personalised prosthetic textiles. In: Södra Älvsborgs Sjukhus (SÄS) Forsknings- och kvalitetsdagar 2017: Poster presented in the MedTech West exhibition. Paper presented at Södra Älvsborgs Sjukhus (SÄS) Forsknings- och kvalitetsdagar 2017,Skene & Borås Sweden, October 23-27, 2017. Borås
Open this publication in new window or tab >>Scan To Knit - A smart textile platform for personalised prosthetic textiles
2017 (English)In: Södra Älvsborgs Sjukhus (SÄS) Forsknings- och kvalitetsdagar 2017: Poster presented in the MedTech West exhibition, Borås, 2017, , p. 1Conference paper, Poster (with or without abstract) (Other academic)
Place, publisher, year, edition, pages
Borås: , 2017. p. 1
National Category
Medical Materials
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-13263 (URN)
Conference
Södra Älvsborgs Sjukhus (SÄS) Forsknings- och kvalitetsdagar 2017,Skene & Borås Sweden, October 23-27, 2017
Projects
Scan to Knit
Funder
Knowledge Foundation
Available from: 2017-12-18 Created: 2017-12-18 Last updated: 2017-12-19Bibliographically approved
Guo, L., Bashir, T., Bresky, E. & Persson, N.-K. (2016). Electroconductive textiles and textile-based electromechanical sensors — integration in as an approach for smart textiles (1ed.). In: Vladan Koncar (Ed.), Smart Textiles and their Applications: (pp. 657-693). Woodhead Publishing Limited
Open this publication in new window or tab >>Electroconductive textiles and textile-based electromechanical sensors — integration in as an approach for smart textiles
2016 (English)In: Smart Textiles and their Applications / [ed] Vladan Koncar, Woodhead Publishing Limited, 2016, 1, p. 657-693Chapter in book (Refereed) [Artistic work]
Abstract [en]

The unification of textiles and electrics opens up many interesting possibilities for sensorics, actuation, energy transport, energy storage, and information transport. Electrics need conductive structures. Industrially knittable and weavable filaments and yarns are in this chapter overviewed in a typology of seven classes. These are the basics for the integration in approach that is put forward as a concept for successful production of smart textiles.Integration means that a "device" is (1) made by a textile production process and (2) made as a textile. We focus on smart textiles for mechanical sensoring that give an electrical output as these embrace such basic quantities as position, movement, speed, acceleration, elongation, forces, pressure, and vibration. Cases of mechanical sensors are demonstrated based on piezoelectricity and capacitive techniques. It is shown that these are promising technologies for smart textiles in general and the integration approach specifically.

Place, publisher, year, edition, pages
Woodhead Publishing Limited, 2016 Edition: 1
National Category
Engineering and Technology Natural Sciences
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-11692 (URN)978-0-08-100574-3 (ISBN)
Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2017-01-09Bibliographically approved
Guo, L., Eriksson, S. & Sandsjö, L. (2015). 3D Composite Textile Characteristics Relevant in Pressure Ulcer Management. In: : . Paper presented at 6th world conference on 3D fabrics and their applications, 26-27 may 2015 Raleigh, NC, USA. Raleigh: North Carolina State University (NCSU)
Open this publication in new window or tab >>3D Composite Textile Characteristics Relevant in Pressure Ulcer Management
2015 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

INTRODUCTION

Effective ulcer management requires the wound to be in a moist but still breathable environment, to facilitate healing, absorb exudates and prevent maceration. One of the applicable methods to achieve this is the use of composite dressings. Most composite dressings are made of three layers to provide absorption and a bacterial barrier in a non- or semi-adherent cover. Various common textile materials such as cotton, polyester, polypropylene and cellulose can be used as different layers in those wound dressings. In addition to these established dressings, electrical stimulation therapy may be used in treating ulcers. It has been reported that electrical stimulation can reduce the area and depth of the wound in a shortened time compared to conventional treatment. In summary, encouraging wound healing results have been obtained both from using composite wound dressing and from applying of electrical stimulation. The aim of this study is to present a conceptual design based on a woven 3D structure that combines the composite wound dressing properties with electrical stimulation for pressure ulcers healing/management.

METHOD

In the suggested structure, different layers in X, Y and Z led were designed with different materials for different purposes.  The top layer consisting of a low-density web to provide a non-adherent layer combined with two textile electrodes made of conductive threads, the middle layer contributes pressure release and absorption of exudates, and the bottom layer next to the wound for moisture keeping while still allowing adequate ventilation.

Two key properties were addressed in the study: pressure release and the possibility to provide electrical stimulation of the wound. Simulation with COMSOL Multiphysics was used to study pressure distribution according to Hertz contact theory. The surface resistance of the electrodes were also studied using in-house designed four-point measurement probes.

RESULTS

The simulation results show the composite structure to exhibit good pressure release properties. Surface resistance testing proved that the textile electrodes have resistance in the magnitude of 102 indicating that textile electrodes can be used for electrical stimulation in ulcers healing.

The first results from this study demonstrate the feasibility to design a textile system combining established composite dressings solutions with means for electrical stimulation based on 3D weaving technique to be applied in pressure ulcer healing. 

Place, publisher, year, edition, pages
Raleigh: North Carolina State University (NCSU), 2015
Keywords
Smart textiles, sensors, 3D weaving, healthcare, ulcer management, composite
National Category
Textile, Rubber and Polymeric Materials
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-8744 (URN)
Conference
6th world conference on 3D fabrics and their applications, 26-27 may 2015 Raleigh, NC, USA
Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2017-05-04Bibliographically approved
Guo, L. (2014). Smart clothing system for respiratory monitoring: wearability and user acceptance study. In: : . Paper presented at 2nd International congress on healthcare and medical textiles, 25-26 September, 2014, Izmir, Turkey. EGE Meditex
Open this publication in new window or tab >>Smart clothing system for respiratory monitoring: wearability and user acceptance study
2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Functionality, wearability, and user acceptance are critical issues for the development and eventual commercialization of the smart products. The use of smart clothing for medical reasons requires an understanding of the users’ perspective and the willingness to use the products. In this study, a smart clothing system has been developed for respiratory monitoring. Besides the functionality, the wearability from users' perspective has been considered though the design phases. Wearability and user acceptance have been examined by two questionnaires. Results shown the smart clothing system improves comfort and wearability compared with the ordinary respiratory monitoring device and most of the participants believe that using a smart clothing system will improve both health condition and quality of life.

Place, publisher, year, edition, pages
EGE Meditex, 2014
Keywords
Smart textiles
National Category
Materials Engineering
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-7339 (URN)2320/14698 (Local ID)2320/14698 (Archive number)2320/14698 (OAI)
Conference
2nd International congress on healthcare and medical textiles, 25-26 September, 2014, Izmir, Turkey
Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2017-03-01Bibliographically approved
Guo, L., Eriksson, S. & Sandsjö, L. (2014). Surface Resistivity of Textile-Based Electrodes. In: : . Paper presented at The 89th Textile Institute World Conference, 2-6 November, 2014, Wuhan, China. Textile Institute
Open this publication in new window or tab >>Surface Resistivity of Textile-Based Electrodes
2014 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Textile-based electrodes show great potential as substitution of conventional electrodes when long-time monitoring is required. The flexibility and high skin-electrode contacting area make it possible to avoid the use of contact gel, which may cause irritation to the patients' skin. In this study, textile-based electrodes were made by combining conductive materials with high absorption nature fibres with the intention to create and maintain a microenvironment that improve the contact between the skin and electrode by local sweating at the electrode site. Alternatively artificial sweat (i.e. saline) may be added for a similar effect. However, by adding nature fibres into the electrodes, the electrical properties of the electrodes are modified due to the ration of conductive yarns is decreased. In this paper, the surface resistivity in the warp and weft directions and its distribution were measured in a four-wire resistance mode. The resistivity of the conductive yarns, the type of nature fibres, the textile construction and the fabric pick density were selected as the independent variables and the surface resistivity in warp and weft measurement directions was the dependent variable to be analysed. Preliminary results show that the conductivity of the conductive yarns are more important than the fabric pick density; surface resistance were not measurable in warp direction of most plain weave fabrics since the conductive yarns were only involved in the weft direction, however, the resistance were measureable in the case of satin fabrics; and that the surface resistivity is more evenly distributed in weft direction than the warp direction

Place, publisher, year, edition, pages
Textile Institute, 2014
Keywords
Textile electrodes, Surface resistivity, Conductive yarn, Weave design, Smart textiles
National Category
Materials Engineering
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-7338 (URN)2320/14631 (Local ID)2320/14631 (Archive number)2320/14631 (OAI)
Conference
The 89th Textile Institute World Conference, 2-6 November, 2014, Wuhan, China
Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2017-03-01Bibliographically approved
Guo, L., Berglin, L., Wiklund, U. & Mattila, H. (2013). Design of a Garments-Based Sensing System for Breathing Monitoring. Textile research journal, 85(No 5), 499-509
Open this publication in new window or tab >>Design of a Garments-Based Sensing System for Breathing Monitoring
2013 (English)In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 85, no No 5, p. 499-509Article in journal (Refereed) Published
Abstract [en]

The long-term monitoring of biophysiological signals requires new types of sensor systems that are wearable and at the same time convenient for the users. This paper describes the design of a novel garment-based sensing system for the long-term monitoring of breathing rhythm. The system concept was realized in a prototype garment, integrated with coated piezoresistive sensors. The prototype garment was tested by five subjects, and compared with a standard piezoelectric respiratory belt. Each signal was quantitatively and qualitatively evaluated in the time and frequency domain to make sure that no medical and diagnostic information was lost. The results showed a good agreement between the garment-based sensors and the standard reference, where errors occurred only when the breathing rate was extremely high. The garment-based sensor system could also distinguish the predominance breathing compartment (chest versus abdominal breathing). The system could detect a 10 s pause in breathing, which could be of importance in studies of sleep apnea. A garment-based sensing system maintains the accuracy of the signal quality without reducing the comfort for the user. It makes possible long-term ambulatory monitoring and has home-based healthcare applications.

Place, publisher, year, edition, pages
Sage Publications Ltd., 2013
Keywords
Smart Textiles
National Category
Computer and Information Sciences Other Computer and Information Science
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-1781 (URN)10.1177/0040517512444336 (DOI)000317933200006 ()2320/13246 (Local ID)2320/13246 (Archive number)2320/13246 (OAI)
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2018-01-10Bibliographically approved
Sandsjö, L., Löfhede, J., Eriksson, S., Guo, L. & Thordstein, M. (2012). EEG Measurements using Textile Electrodes. Paper presented at ISEK 2012 - XIX Congress of the International Society of Electrophysiology and Kinesiology, Brisbane, Australia, 19-21st July, 2012. Paper presented at ISEK 2012 - XIX Congress of the International Society of Electrophysiology and Kinesiology, Brisbane, Australia, 19-21st July, 2012. CCRE SPINE, The University of Queensland, Brisbane, Australia
Open this publication in new window or tab >>EEG Measurements using Textile Electrodes
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2012 (English)Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
CCRE SPINE, The University of Queensland, Brisbane, Australia, 2012
Keywords
Medicinsk teknik, Smarta textilier
National Category
Medical Laboratory and Measurements Technologies
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-6817 (URN)2320/11307 (Local ID)978-0-646-58228-3 (ISBN)2320/11307 (Archive number)2320/11307 (OAI)
Conference
ISEK 2012 - XIX Congress of the International Society of Electrophysiology and Kinesiology, Brisbane, Australia, 19-21st July, 2012
Available from: 2015-12-22 Created: 2015-12-22
Guo, L., Berglin, L. & Mattila, H. (2012). Improvement of Electro-Mechanical Properties of Strain Sensors made of elastic-conductive hybrid yarns. Textile research journal, 82(19), 1937-1947
Open this publication in new window or tab >>Improvement of Electro-Mechanical Properties of Strain Sensors made of elastic-conductive hybrid yarns
2012 (English)In: Textile research journal, ISSN 0040-5175, E-ISSN 1746-7748, Vol. 82, no 19, p. 1937-1947Article in journal (Refereed) Published
Abstract [en]

Fabric-based strain sensors have been developed using different technologies, among which flat knitting is one of the most effective and economical methods. However, knitted strain sensors are not often used in practical applications because the sensors usually exhibit large elastic hysteresis when they are deformed and subjected to stress during application. One possible approach to overcome these shortcomings is to introduce elastic properties at the yarn level by combining the conductive materials with elastic materials. In this paper, we demostrate a hybrid yarn made of a conductive yarn that winds around an elastic core yarn in a direct twisting device. The electro-mechanical properties of strain sensors knitted from the hybrid yarns were tested in order to characterize the sensors. This study consisted of two stages: the yarn preparation and the sensor characterization. In the first stage, two kinds of elastic core components (polyamide/Lycra and polyamide) and two kinds of conductive winding yarns (Bekinox BK50/1 and Bekinox BK50/2) were selected for twisting. The twisting was done with a constant twisting speed and four different numbers of twists. Mechanical properties, that is, the tenacity, force at break and elongation at break, were tested in order to determine the optimal parameters for producing the hybrid yarns. The results indicated that among the tested yarns those with a polyamide core and Bekinox BK50/1 winding yarns at 450 twist/meter and with a polyamide/Lycra core and Bekinox BK 50/2 winding yarns at 600 twist/meter had the best properties. These were thus selected as the materials for producing knitted strain sensors. In the second stage, electro-mechanical properties of the knitted strain sensors were determined under tensile stress and multi-cyclic tensile stress. The results show that the hybrid yarns can effectively enhance the

Place, publisher, year, edition, pages
SAGE Journals, 2012
Keywords
smart textiles, Knitted strain sensor, sensor, hybrid yarn, electro-mechanical, elasticity, conductive, Textile technology
National Category
Materials Engineering Other Humanities
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-1407 (URN)10.1177/0040517512452931 (DOI)000310298000001 ()2320/11710 (Local ID)2320/11710 (Archive number)2320/11710 (OAI)
Note

Sponsorship:

Smart Textile

Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-11-28Bibliographically approved
Löfhede, J., Eriksson, S., Sandsjö, L., Guo, L. & Thordstein, M. (2012). Monitoring of Brain Activity Using Textile Electrodes. In: : . Paper presented at From Human Health to Biosustainability - Future Challenges for Life Science at Chalmers. Chalmers
Open this publication in new window or tab >>Monitoring of Brain Activity Using Textile Electrodes
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2012 (English)Conference paper, Poster (with or without abstract) (Other academic)
Place, publisher, year, edition, pages
Chalmers, 2012
Keywords
Smart Textiles, EEG monitoring, Smart Textiles, Biomedical Engineering
National Category
Neurosciences Medical Laboratory and Measurements Technologies
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-6838 (URN)2320/11534 (Local ID)2320/11534 (Archive number)2320/11534 (OAI)
Conference
From Human Health to Biosustainability - Future Challenges for Life Science at Chalmers
Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2018-01-10Bibliographically approved
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