Low Power Respiration Monitoring Using Wearable 3D Knitted Helical Coils

Kiener, Kevin; Anand, A.; Fobelets, William; Fobelets, Kristel

doi:10.1109/jsen.2021.3131267

Cited by 8 publications

(3 citation statements)

References 15 publications

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“…In addition, it was found that the yarn crossover points between the stitches in jersey knit increase the inductance variation as a function of stretch compared to that using rib stitch. A more tight-fitting garment obtained by reducing needle size will also boost performance as it not only decreases the metal wire length but also follows chest movements better [6]. Different coils were knitted in a 1/1 rib stitch using cotton yarn with a different number of rows that include the metal wire.…”

Section: Resultsmentioning

confidence: 99%

Respiratory Inductive Plethysmography System for Knitted Helical Coils

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Respiratory Inductive Plethysmography System for Knitted Helical Coils

et al. 2022

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“…Therefore, alternative approaches towards smart wearable garments for healthcare and their acceptability for the user are investigated [20]. We developed a knitted breathing sensor garment [21,22] with a more classical look and feel that could potentially lead to wider user acceptance and market adoption, especially in areas related to long term breathing monitoring. Long term breathing monitoring has been identified as a method to help people with lung diseases such as asthma [23,24].…”

Section: Introductionmentioning

confidence: 99%

Examining the Wearability and Implementation of Knitted Sensor Garments for Long Term Monitoring of Breathing Health: Thematic Analysis and Sensor Performance Characterization (Preprint)

Fobelets,

Mohanty,

Thielemans

et al. 2024

Preprint

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BACKGROUND Long term unobtrusive monitoring of breathing patterns can potentially give a more realistic insight into the respiratory health of people with asthma or chronic obstructive pulmonary disease than brief tests performed in medical environments. However, it is uncertain whether users would be willing to wear these sensor garments long term. OBJECTIVE Our objective was to explore whether users would wear knitted garments with knitted-in breathing sensors long term to monitor their lung health and under what conditions. METHODS Multiple knitted breathing sensor garments, developed and fabricated by the research team, were presented during a demonstration. Participants were encouraged to touch and feel the garments and ask questions. This was followed by two semi-structured, independently led focus groups with a total of 16 participants of which 4 had asthma. The focus group conversations were recorded and transcribed. Thematic analysis was carried out by three independent researchers in three phases consisting of: familiarization with the data, independent coding and overarching theme definition. Participants also completed a web-based questionnaire to probe opinion about wearability and functionality of the garments. Quantitative analysis of the sensors’ performance was mapped to participants’ garment preference to support the feasibility of the technology for long term wear. RESULTS Key points extracted from the qualitative data were: 1) garments more likely to be worn if medically prescribed, 2) cotton vest as underwear was preferred, and 3) a breathing crisis warning system was seen as a promising application. The qualitative analysis showed a preference for loose short sleeved T-shirts with a 81% acceptability rate, a 69% acceptability rate for snug fitting garments and 0% for tight-fitting garments. 62% of the participants would wear the knit for the whole day and 81% only during the night if not too hot. The sensitivity demands on the knitted wearable sensors can be aligned with users’ garment preferences. CONCLUSIONS There is an overall positive opinion about wearing a knitted sensor garment over a long period of time for monitoring of respiratory health. The knit cannot be tight but should be able to be worn as a vest as underwear in a breathable material. These requirements can be fulfilled with the proposed garments. Participants with asthma supported using it as a sensor garment connected to an asthma attack alert system.

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“…Next, we review some of the major developments in this field. A three-dimensional (3D) knitted helical coil wrapped around the chest, which can be worn every day, was used for breathing monitoring in [20]. The same principle of the 3D knitted helical coil works for various other applications as well.…”

Section: Introductionmentioning

confidence: 99%

Wearable Inductive Sensing of the Arm Joint: Comparison of Three Sensing Configurations

2022

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Currently, there is a rapidly growing interest and demand for wearable textile sensors that can monitor human motions in a naturalistic environment. Some potential applications for this technology include research on measuring the motor skill performance of patients with motor disabilities such as autism spectrum disorder, Parkinson’s disease, cerebral palsy, and stroke and evaluating the efficacy of applied treatments. Among wearable sensors, inductive sensors that are made from highly conductive threads are attractive due to their easy development process, high reliability, and low cost. In this study, we analyzed and compared the performance of three inductive wearable sensor configurations—(1) single planar rectangular coil, (2) two separated coils connected in series, and (3) two helical coils connected in series—in terms of the change in the resonant frequency of the tank circuit they comprised as a result of the change in elbow joint angle through simulations. Three parameters of length, width, and the number of turns were considered to calculate sensor sensitivity to the joint angle. The coil with the highest sensitivity was then fabricated and measured, and its performance was compared with the simulation results. The proposed methodology can be extended to sensing other joints in the body such as the shoulders, fingers, and knees.

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Low Power Respiration Monitoring Using Wearable 3D Knitted Helical Coils

Cited by 8 publications

References 15 publications

Respiratory Inductive Plethysmography System for Knitted Helical Coils

Respiratory Inductive Plethysmography System for Knitted Helical Coils

Examining the Wearability and Implementation of Knitted Sensor Garments for Long Term Monitoring of Breathing Health: Thematic Analysis and Sensor Performance Characterization (Preprint)

Wearable Inductive Sensing of the Arm Joint: Comparison of Three Sensing Configurations

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