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Guo, Li
Alternative names
Publications (10 of 39) Show all publications
Sarker, S., Persson, N.-K. & Guo, L. (2024). A Collection of Textile Constructions Suited for Inherent Actuation.
Open this publication in new window or tab >>A Collection of Textile Constructions Suited for Inherent Actuation
2024 (English)Report (Other academic)
National Category
Textile, Rubber and Polymeric Materials
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-31747 (URN)
Funder
EU, Horizon Europe, 101072920
Note

SoftWear EU project deliverable.

Available from: 2024-04-09 Created: 2024-04-09 Last updated: 2024-04-09
Euler, L., Guo, L. & Persson, N.-K. (2024). Influence of the electrolyte concentration and amount on the performance of textile electrodes in electrostimulation: A systematic study. Sensors and Actuators A-Physical, 366, Article ID 115010.
Open this publication in new window or tab >>Influence of the electrolyte concentration and amount on the performance of textile electrodes in electrostimulation: A systematic study
2024 (English)In: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 366, article id 115010Article in journal (Refereed) Published
Abstract [en]

Background

Textile-based stimulation electrodes are a fast-growing research area. With their advantages including flexibility, reusability and the possibility for integration into garments, textile electrodes open up new possibilities that are not yet feasible today, e.g. various self-administrated treatments and rehabilitation based on neuromuscular electrical stimulation (NMES) or transcutaneous electrical nerve stimulation (TENS). So far, most research has shown that textile-based stimulation electrodes perform more reliable when wetted with an electrolyte. However, there is no systematic investigation about which type and amount of electrolyte to use.

Methods

In this study, double-layered textile electrodes have been produced by machine knitting with a size of 3 × 3 cm2. The electrodes were wetted stepwise with a liquid amount from 5 µL up to 320 µL; four levels of sodium chloride (NaCl) concentrations, i.e. 0.9%, 1.5%, 5% and 35%, plus pure deionized water as a reference liquid were chosen. The study analyzed the behavior of the skin-electrode impedance when changing the moisture content and NaCl concentration. In addition, equivalent circuits were modelled for deeper insights into the mechanisms causing an impedance change.

Results

Results showed that the impedance was greatly influenced by the liquid amount with amounts of 5 µL already significantly reducing the impedance compared to dry electrodes, caused by a substantial reduction in resistance. The reactance, on the other hand, was only partly influenced by the liquid amount showing a reduction upon higher liquid amounts only within a range of 5 – 40 µL. Further, a significant influence on the impedance by the presence of ions was found where the skin-electrode systems wetted with NaCl solution were showing generally lower impedances than systems wetted with deionized water. However, within this, no remarkable influence of the NaCl concentration could be observed. As the impedance was found to be very sensitive to the moisture content in the system, it is recommended to introduce standardizations for impedance testing of wet textile electrodes with precisely controlled electrolyte volumes and liquid migration properties to make independent studies of textile electrodes more comparable.

Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
smart textiles, electrodes physiology, Electrotherapy, Electrical stimulation, Impedance
National Category
Textile, Rubber and Polymeric Materials
Research subject
Textiles and Fashion (Design)
Identifiers
urn:nbn:se:hb:diva-31360 (URN)10.1016/j.sna.2024.115010 (DOI)001156311600033 ()2-s2.0-85182396566 (Scopus ID)
Funder
Vinnova
Available from: 2024-01-21 Created: 2024-01-21 Last updated: 2024-05-15Bibliographically approved
Juthberg, R., Flodin, J., Guo, L., Rodriguez, S., Persson, N.-K. & Ackermann, P. W. (2023). Correction to: Neuromuscular electrical stimulation in garments optimized for compliance (European Journal of Applied Physiology, (2023), 123, 8, (1739-1748), 10.1007/s00421-023-05181-9). Springer, 123(8)
Open this publication in new window or tab >>Correction to: Neuromuscular electrical stimulation in garments optimized for compliance (European Journal of Applied Physiology, (2023), 123, 8, (1739-1748), 10.1007/s00421-023-05181-9)
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2023 (English)Other (Other academic)
Abstract [en]

The original version of this article unfortunately contained a mistake. A small error in the energy-formula. The original correct formula should be (Formula presented.) 

Place, publisher, year, pages
Springer, 2023
Keywords
erratum
National Category
Physiology
Identifiers
urn:nbn:se:hb:diva-30299 (URN)10.1007/s00421-023-05211-6 (DOI)000984650200001 ()2-s2.0-85158092698 (Scopus ID)
Available from: 2023-08-14 Created: 2023-08-14 Last updated: 2024-02-01Bibliographically approved
Sundström, C., Juthberg, R., Flodin, J., Guo, L., Persson, N.-K. & Ackermann, P. W. (2023). Effects on hemodynamic enhancement and discomfort of a new textile electrode integrated in a sock during calf neuromuscular electrical stimulation. European Journal of Applied Physiology
Open this publication in new window or tab >>Effects on hemodynamic enhancement and discomfort of a new textile electrode integrated in a sock during calf neuromuscular electrical stimulation
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2023 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327Article in journal (Refereed) Published
Abstract [en]

Purpose: To compare fixed transverse textile electrodes (TTE) knitted into a sock versus motor point placed standard gel electrodes (MPE) on peak venous velocity (PVV) and discomfort, during calf neuromuscular electrical stimulation (calf-NMES). Methods: Ten healthy participants received calf-NMES with increasing intensity until plantar flexion (measurement level I = ML I), and an additional mean 4 mA intensity (ML II), utilizing TTE and MPE. PVV was measured with Doppler ultrasound in the popliteal and femoral veins at baseline, ML I and II. Discomfort was assessed with a numerical rating scale (NRS, 0–10). Significance was set to p < 0.05. Results: TTE and MPE both induced significant increases in PVV from baseline to ML I and significantly higher increases to ML II, in both the popliteal and femoral veins (all p < 0.001). The popliteal increases of PVV from baseline to both ML I and II were significantly higher with TTE versus MPE (p < 0.05). The femoral increases of PVV from baseline to both ML I and II were not significantly different between TTE and MPE. TTE versus MPE resulted at ML I in higher mA and NRS (p < 0.001), and at ML II in higher mA (p = 0.005) while NRS was not significantly different. Conclusion: TTE integrated in a sock produces intensity-dependent increases of popliteal and femoral hemodynamics comparable to MPE, but results in more discomfort at plantar flexion due to higher current required. TTE exhibits in the popliteal vein higher increases of PVV compared to MPE. Trial registration: Trial_ID: ISRCTN49260430. Date: 11/01/2022. Retrospectively registered.

Place, publisher, year, edition, pages
Springer, 2023
Keywords
Electric stimulation therapy, Hemodynamics, Motor point, NMES, Pain, Textile electrodes
National Category
Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:hb:diva-30255 (URN)10.1007/s00421-023-05212-5 (DOI)000982776600001 ()2-s2.0-85158166949 (Scopus ID)
Available from: 2023-08-15 Created: 2023-08-15 Last updated: 2024-02-21Bibliographically approved
Juthberg, R., Flodin, J., Guo, L., Rodriguez, S., Persson, N.-K. & Ackermann, P. W. (2023). Neuromuscular electrical stimulation in garments optimized for compliance. European Journal of Applied Physiology
Open this publication in new window or tab >>Neuromuscular electrical stimulation in garments optimized for compliance
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2023 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327Article in journal (Refereed) Published
Abstract [en]

Purpose

Physical inactivity is associated with muscle atrophy and venous thromboembolism, which may be prevented by neuromuscular electrical stimulation (NMES). This study aimed to investigate the effect on discomfort, current amplitude and energy consumption when varying the frequency and phase duration of low-intensity NMES (LI-NMES) via a sock with knitting-integrated transverse textile electrodes (TTE).

Methods

On eleven healthy participants (four females), calf-NMES via a TTE sock was applied with increasing intensity (mA) until ankle-plantar flexion at which point outcomes were compared when testing frequencies 1, 3, 10 and 36 Hz and phase durations 75, 150, 200, 300 and 400 µs. Discomfort was assessed with a numerical rating scale (NRS, 0–10) and energy consumption was calculated and expressed in milli-Joule (mJ). Significance set to p ≤ 0.05.

Results

1 Hz yielded a median (inter-quartile range) NRS of 2.4 (1.0–3.4), significantly lower than both 3 Hz with NRS 2.8 (1.8–4.2), and 10 Hz with NRS 3.4 (1.4–5.4) (both p ≤ .014). Each increase in tested frequency resulted in significantly higher energy consumption, e.g. 0.6 mJ (0.5–0.8) for 1 Hz vs 14.9 mJ (12.3–21.2) for 36 Hz (p = .003). Longer phase durations had no significant effect on discomfort despite generally requiring significantly lower current amplitudes. Phase durations 150, 200 and 400 µs required significantly lower energy consumption compared to 75 µs (all p ≤ .037).

Conclusion

LI-NMES applied via a TTE sock produces a relevant plantar flexion of the ankle with the best comfort and lowest energy consumption using 1 Hz and phase durations 150, 200 or 400 µs.

Place, publisher, year, edition, pages
Springer, 2023
Keywords
Electric stimulation therapy, Pain, Patient comfort, Patient compliance
National Category
Textile, Rubber and Polymeric Materials
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-29837 (URN)10.1007/s00421-023-05181-9 (DOI)000982817500001 ()2-s2.0-85165608495 (Scopus ID)
Funder
Vinnova, 2019-05479Karolinska Institute
Available from: 2023-05-25 Created: 2023-05-25 Last updated: 2024-02-01Bibliographically approved
Backe, C., Martinez, J. G., Guo, L., Jager, E. W. H. & Persson, N.-K. (2023). Serially connected EAP based tape yarns for in-air actuation using textile structures. In: : . Paper presented at EuroEAP 2023. Eleventh International Conference on Soft Transducers and Electromechanically Active Polymers, Bristol, UK, 6-8th June, 2023..
Open this publication in new window or tab >>Serially connected EAP based tape yarns for in-air actuation using textile structures
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2023 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Smart textiles that have the capability for actuation are of great interest for creating wearables and haptic devices. Through the use of textile fabric production processes electroactive polymeric materials in the form of film-based yarns can be integrated and combined with passive yarns to create soft, actuating fabrics. This way single EAP materials can be transformed into segments consisting of multiple EAP yarns working together. Furthermore, these segments can be positioned within a fabric to work individually or simultaneously in different patterns by use of incorporated conductive yarn paths. While the chase for additivity in force is a long-standing part of developing new actuator structures, so is the need for additivity in displacement motion. Here we construct an actuating textile fabric through the process of weaving that is able to operate in-air using polypyrrole-based tape yarns with choline acetate ionic liquid. Finding the balance between the weaving parameters turned out to be key. We found that in a vertically suspended arrangement, a three-segment serially connected fabric assembly demonstrated an accumulative effect in displacement and a joint-like motion behaviour. This opens up for more complicated motion patterns to be created through textile processing of EAP materials. 

National Category
Textile, Rubber and Polymeric Materials
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-31700 (URN)
Conference
EuroEAP 2023. Eleventh International Conference on Soft Transducers and Electromechanically Active Polymers, Bristol, UK, 6-8th June, 2023.
Available from: 2024-03-19 Created: 2024-03-19 Last updated: 2024-05-22Bibliographically approved
Björkquist, A., Guo, L., Kristoffersen, M. B., Novoa, M. M., Ortiz-Catalan, M. & Sandsjö, L. (2023). Towards Implementation of a Home-Based Phantom Limb Pain Treatment Facilitated by Textile-Electrode System - A Case Study. In: Caring is Sharing — Exploiting the Value in Data for Health and Innovation: Proceedings of MIE 2023. Paper presented at 33rd Medical Informatics Europe Conference, MIE2023 (pp. 682-683). IOS Press
Open this publication in new window or tab >>Towards Implementation of a Home-Based Phantom Limb Pain Treatment Facilitated by Textile-Electrode System - A Case Study
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2023 (English)In: Caring is Sharing — Exploiting the Value in Data for Health and Innovation: Proceedings of MIE 2023, IOS Press, 2023, p. 682-683Conference paper, Published paper (Refereed)
Abstract [en]

This case study reports the use of a new textile-electrode system for self-administered Phantom Motor Execution (PME) treatment at home in one patient with Phantom Limb Pain (PLP). In follow-up interviews, the patient reported reduced pain, increased mobility, and improved mental health, and aspects such as motivation, usability, support, and treatment outcome, could be recognized from an earlier study as crucial for successful implementation and adoption of the home-based long-term treatment. The findings are of interest to developers, providers, users, and researchers planning home-based clinical studies and/or scenarios based on technology-assisted treatment. 

Place, publisher, year, edition, pages
IOS Press, 2023
Series
Studies in Health Technology and Informatics, ISSN 0926-9630, E-ISSN 1879-8365 ; 302
Keywords
Home-based, Phantom limb pain, Self-administered, Textile electrodes, Electrodes, Humans, Pain Measurement, Phantom Limb, Treatment Outcome, Medical informatics, Patient treatment, Textiles, Case-studies, Electrode systems, Follow up, Mental health, Pain treatment, Phantom limb pains, Phantoms, human
National Category
General Practice
Identifiers
urn:nbn:se:hb:diva-30283 (URN)10.3233/SHTI230237 (DOI)001071432900179 ()2-s2.0-85159765281 (Scopus ID)9781643683881 (ISBN)978-1-64368-389-8 (ISBN)
Conference
33rd Medical Informatics Europe Conference, MIE2023
Available from: 2023-08-14 Created: 2023-08-14 Last updated: 2023-10-31Bibliographically approved
Flodin, J., Wallenius, P., Guo, L., Persson, N.-K. & Ackermann, P. (2023). Wearable Neuromuscular Electrical Stimulation on Quadriceps Muscle Can Increase Venous Flow. Annals of Biomedical Engineering, 51(12), 2873-2882
Open this publication in new window or tab >>Wearable Neuromuscular Electrical Stimulation on Quadriceps Muscle Can Increase Venous Flow
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2023 (English)In: Annals of Biomedical Engineering, ISSN 0090-6964, E-ISSN 1573-9686, Vol. 51, no 12, p. 2873-2882Article in journal (Refereed) Published
Abstract [en]

Neuromuscular electrical stimulation (NMES) of the quadriceps (Q) may increase venous blood flow to reduce the risk of venous thromboembolism. This study assessed whether Q-NMES pants could increase peak venous velocity (PVV) in the femoral vein using Doppler ultrasound and minimize discomfort. On 15 healthy subjects, Q-NMES using textile electrodes integrated in pants was applied with increasing intensity (mA) until the first visible muscle contraction [measurement level (ML)-I] and with an additional increase of six NMES levels (ML II). Discomfort using a numeric rating scale (NRS, 0–10) and PVV were used to assess different NMES parameters: frequency (1, 36, 66 Hz), ramp-up/-down time (RUD) (0, 1 s), plateau time (1.5, 4, and 6 s), and on:off duty cycle (1:1, 1:2, 1:3, 1:4). Q-NMES pants significantly increased PVV from baseline with 93% at ML I and 173% at ML II. Frequencies 36 Hz and 66 Hz and no RUD resulted in significantly higher PVV at both MLs compared to 1 Hz and 1 s RUD, respectively. Plateau time, and duty cycle did not significantly change PVV. Discomfort was only significantly higher with increasing intensity and frequency. Q-NMES pants produces intensity-dependent 2−3-fold increases of venous blood flow with minimal discomfort. The superior NMES parameters were a frequency of 36 Hz, 0 s RUD, and intensity at ML II. Textile-based NMES wearables are promising for non-episodic venous thromboembolism prevention. 

Keywords
Electrical stimulation therapy, Muscle stimulation, Skeletal muscles, Thromboprophylaxis, Deep vein thrombosis, Venous thromboembolism, Peak venous velocity, Textile electrodes, Smart textiles
National Category
Materials Engineering
Identifiers
urn:nbn:se:hb:diva-31335 (URN)10.1007/s10439-023-03349-0 (DOI)001050737400001 ()2-s2.0-85168343519 (Scopus ID)
Funder
Swedish Research Council, 2017-00202Stockholm County Council, SLL20180348Karolinska Institute
Available from: 2024-01-16 Created: 2024-01-16 Last updated: 2024-02-01Bibliographically approved
Björkquist, A., Kristoffersen, M., Muñoz-Novoa, M., Ortiz-Catalan, M., Sandsjö, L. & Guo, L. (2022). A Textile-based Electrode System for Self-administered Phantom Limb Pain Treatment in the Home Environment. In: Proceedings from the 24th Congress of the International Society of Electrophysiology and kinesiology - ISEK XXIV, June 22-25, 2022, Quebec City, Canada: . Paper presented at The 24th Congress of the International Society of Electrophysiology and kinesiology (ISEK XXIV), Quebec City, Canada, June 22-25, 2022..
Open this publication in new window or tab >>A Textile-based Electrode System for Self-administered Phantom Limb Pain Treatment in the Home Environment
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2022 (English)In: Proceedings from the 24th Congress of the International Society of Electrophysiology and kinesiology - ISEK XXIV, June 22-25, 2022, Quebec City, Canada, 2022Conference paper, Oral presentation with published abstract (Other academic)
National Category
Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:hb:diva-31293 (URN)
Conference
The 24th Congress of the International Society of Electrophysiology and kinesiology (ISEK XXIV), Quebec City, Canada, June 22-25, 2022.
Funder
Knowledge Foundation
Available from: 2024-01-11 Created: 2024-01-11 Last updated: 2024-01-12
Lindell, E., Tingsvik, H., Guo, L. & Peterson, J. (2021). 3D Body Scan as Anthropometric Tool for Individualized Prosthetic Socks. Autex Research Journal
Open this publication in new window or tab >>3D Body Scan as Anthropometric Tool for Individualized Prosthetic Socks
2021 (English)In: Autex Research JournalArticle in journal (Refereed) Published
Abstract [en]

Every year, approximately 3,000 people in Sweden undergo amputation of a body part. The use of a prosthesis can greatly improve the quality of life for these people. To improve the fi t and comfort of a prosthesis, a sock is used as an interface between the prosthesis socket and the stump. A three-dimensional (3D) body scanner can be used to take measurements that are used to produce individualized socks that improve fi t and comfort. The standardized method for taking measurements with a 3D body scanner often requires a standing position and hence a new scanning method is needed to improve the accessibility for 3D body scanning. This study aimed to create a scanning scenario and an algorithm for scanning amputation stumps for individualizing prosthesis socks for upper-body amputations. Vitronic VITUSSMART LC 3D Body Scanner was used in this study. The results show a seated position with arms slightly away from the body, scanned at 45° as the best. To measure the right upper arm and the left armpit, the best was to scan at a 315° angle. Paired t-tests showed no signifi cant differences compared with the 3D body scanner of traditional manual measurements. The proposed method exhibited good relative reliability and potential to facilitate the customization of prosthetic socks for amputees.

Keywords
3DBodyScanner, prostheticsock, upper-bodyamputation, anthropometricmeasurement
National Category
Medical Image Processing
Identifiers
urn:nbn:se:hb:diva-26170 (URN)10.2478/aut-2021-0007 (DOI)000734170200001 ()2-s2.0-85110287716 (Scopus ID)
Available from: 2021-08-11 Created: 2021-08-11 Last updated: 2022-09-14Bibliographically approved
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