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González JE, Rodríguez MA, Caballero E, Pardo A, Marco S, Farré R. Open-source, low-cost App-driven Internet of Things approach to facilitate respiratory oscillometry at home and in developing countries. Pulmonology 2024; 30:180-183. [PMID: 37968180 DOI: 10.1016/j.pulmoe.2023.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 10/09/2023] [Accepted: 10/09/2023] [Indexed: 11/17/2023] Open
Affiliation(s)
- J-E González
- Unit of Biophysics and Bioengineering, School of Medicine and Health Sciences, Universitat de Barcelona, Barcelona, Spain
| | - M A Rodríguez
- Unit of Biophysics and Bioengineering, School of Medicine and Health Sciences, Universitat de Barcelona, Barcelona, Spain
| | - E Caballero
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Barcelona, Spain
| | - A Pardo
- Department of Electronics and Biomedical Engineering, Universitat de Barcelona, Barcelona, Spain
| | - S Marco
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology, Barcelona, Spain; Department of Electronics and Biomedical Engineering, Universitat de Barcelona, Barcelona, Spain
| | - R Farré
- Unit of Biophysics and Bioengineering, School of Medicine and Health Sciences, Universitat de Barcelona, Barcelona, Spain; Institut Investigacions Biomediques August Pi Sunyer, Barcelona, Spain; CIBER de Enfermedades Respiratorias, Madrid, Spain.
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Farré R, Rodríguez-Lázaro MA, Otero J, Gavara N, Sunyer R, Farré N, Gozal D, Almendros I. Low-cost, open-source device for simultaneously subjecting rodents to different circadian cycles of light, food, and temperature. Front Physiol 2024; 15:1356787. [PMID: 38434139 PMCID: PMC10904513 DOI: 10.3389/fphys.2024.1356787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 02/05/2024] [Indexed: 03/05/2024] Open
Abstract
Exposure of experimental rodents to controlled cycles of light, food, and temperature is important when investigating alterations in circadian cycles that profoundly influence health and disease. However, applying such stimuli simultaneously is difficult in practice. We aimed to design, build, test, and open-source describe a simple device that subjects a conventional mouse cage to independent cycles of physiologically relevant environmental variables. The device is based on a box enclosing the rodent cage to modify the light, feeding, and temperature environments. The device provides temperature-controlled air conditioning (heating or cooling) by a Peltier module and includes programmable feeding and illumination. All functions are set by a user-friendly front panel for independent cycle programming. Bench testing with a model simulating the CO2 production of mice in the cage showed: a) suitable air renewal (by measuring actual ambient CO2), b) controlled realistic illumination at the mouse enclosure (measured by a photometer), c) stable temperature control, and d) correct cycling of light, feeding, and temperature. The cost of all the supplies (retail purchased by e-commerce) was <300 US$. Detailed technical information is open-source provided, allowing for any user to reliably reproduce or modify the device. This approach can considerably facilitate circadian research since using one of the described low-cost devices for any mouse group with a given light-food-temperature paradigm allows for all the experiments to be performed simultaneously, thereby requiring no changes in the light/temperature of a general-use laboratory.
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Affiliation(s)
- Ramon Farré
- Unit of Biophysics and Bioengineering, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain
- Institut Investigacions Biomèdiques August Pi Sunyer (IDIBAPS), Barcelona, Spain
| | - Miguel A. Rodríguez-Lázaro
- Unit of Biophysics and Bioengineering, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
| | - Jorge Otero
- Unit of Biophysics and Bioengineering, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain
- The Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), Barcelona, Spain
| | - Núria Gavara
- Unit of Biophysics and Bioengineering, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- The Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology (BIST), Barcelona, Spain
| | - Raimon Sunyer
- Unit of Biophysics and Bioengineering, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - Núria Farré
- Discipline of Cardiology, Saolta University Healthcare Group, Galway, Ireland
- School of Medicine, University of Galway, Galway, Ireland
| | - David Gozal
- Office of the Dean, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV, United States
| | - Isaac Almendros
- Unit of Biophysics and Bioengineering, School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain
- Institut Investigacions Biomèdiques August Pi Sunyer (IDIBAPS), Barcelona, Spain
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Liu D, Kulkarni A, Jaqua VF, Cole CA, Pearce JM. Distributed manufacturing of an open-source tourniquet testing system. HARDWAREX 2023; 15:e00442. [PMID: 37457304 PMCID: PMC10338363 DOI: 10.1016/j.ohx.2023.e00442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 05/16/2023] [Accepted: 06/11/2023] [Indexed: 07/18/2023]
Abstract
Tourniquets are effective for casualty-prevention in emergency situations. The use of centrally-manufactured commercial tourniquets, however, is not always possible due to supply chain disruptions. The open-source hardware model has been applied to overcome these disruptions in humanitarian crises and several low-cost digitally manufacturable open-source tourniquets have been developed. With the low reliability of improvised tourniquets, it is important to ensure that distributed manufacturing of tourniquets is effective and safe. Tourniquets can be tested, but existing tourniquet testers are expensive, bulky, and complex to operate, which limits their accessibility to an even greater extent than tourniquets in extreme settings. This article fulfills a need by providing a small, transportable, open-source additive-manufactured tourniquet tester that enables inexpensive and accurate testing of tourniquets against known clinical parameters. The <$100 tourniquet tester is validated and tested for operating force of tourniquets in the field or in distributed manufacturing facilities. The tourniquet tester has a significant economic and operational advantage compared to proprietary counterparts available on the market. Once calibrated with a blood pressure monitor, the built-in LCD displays the measuring range of the tester as 0 to 200 N, which is enough to test the validation of all tourniquets.
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Affiliation(s)
- Dawei Liu
- Department of Electrical and Computer Engineering, Western University, London, Canada
| | - Apoorv Kulkarni
- Department of Electrical and Computer Engineering, Western University, London, Canada
| | | | | | - Joshua M. Pearce
- Department of Electrical and Computer Engineering, Western University, London, Canada
- Ivey Business School, Western University, London, Canada
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Farré R, Rodríguez-Lázaro MA, Gonzalez-Martin J, Castro P, Hospital T, Compta Y, Solana G, Gozal D, Otero J. Device for Negative Pressure Wound Therapy in Low-Resource Regions: Open-Source Description and Bench Test Evaluation. J Clin Med 2022; 11:jcm11185417. [PMID: 36143070 PMCID: PMC9503864 DOI: 10.3390/jcm11185417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 09/10/2022] [Accepted: 09/13/2022] [Indexed: 11/16/2022] Open
Abstract
Background: Negative (vacuum) pressure therapy promotes wound healing. However, commercially available devices are unaffordable to most potential users in low- and middle-income countries (LMICs), limiting access to many patients who could benefit from this treatment. This study aimed to design and test a cheap and easy-to-build negative pressure device and provide its detailed open-source description, thereby enabling free replication. Methods: the negative pressure device was built using off-the-shelf materials available via e-commerce and was based on a small pump, a pressure transducer, and the simplest Arduino controller with a digital display (total retail cost ≤ 75 US$). The device allows the user to set any therapeutic range of intermittent negative pressure and has two independent safety mechanisms. The performance of the low-cost device was carefully tested on the bench using a phantom wound, producing a realistic exudate flow rate. Results: the device generates the pressure patterns set by the user (25–175 mmHg of vacuum pressure, 0–60 min periods) and can drain exudate flows within the clinical range (up to 1 L/h). Conclusions: a novel, low-cost, easy-to-build negative pressure device for wound healing displays excellent technical performance. The open-source hardware description provided here, which allows for free replication and use in LMICs, will facilitate the application and wider utilization of this therapy to patients.
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Affiliation(s)
- Ramon Farré
- Unitat de Biofísica i Bioenginyeria, Facultat de Medicina i Ciències de la Salut, Universitat de Barcelona, 08036 Barcelona, Spain
- CIBER de Enfermedades Respiratorias, 28029 Madrid, Spain
- Institut Investigacions Biomèdiques August Pi Sunyer, 08036 Barcelona, Spain
- Correspondence:
| | - Miguel A. Rodríguez-Lázaro
- Unitat de Biofísica i Bioenginyeria, Facultat de Medicina i Ciències de la Salut, Universitat de Barcelona, 08036 Barcelona, Spain
| | - Julian Gonzalez-Martin
- Microbiology Department-CDB, Hospital Clinic-ISGlobal-University of Barcelona, 08036 Barcelona, Spain
- CIBER of Infectiuos Diseases (CIBERINFEC), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Pedro Castro
- Institut Investigacions Biomèdiques August Pi Sunyer, 08036 Barcelona, Spain
- Intensive Care Unit, Internal Medicine Department, Hospital Clínic, 08036 Barcelona, Spain
| | - Teresa Hospital
- Intensive Care Unit, Internal Medicine Department, Hospital Clínic, 08036 Barcelona, Spain
| | - Yaroslau Compta
- Institut Investigacions Biomèdiques August Pi Sunyer, 08036 Barcelona, Spain
- Institut de Neurociències, Service of Neurology, Parkinson’s Disease and Movement Disorders Unit, Hospital Clinic de Barcelona, 08036 Barcelona, Spain
- Institut de Neurociències, Maeztu Center, Universitat de Barcelona, 08036 Barcelona, Spain
| | - Gorka Solana
- Faculdade de Engenharias e Tecnologias, Universidade Save, Maxixe, Mozambique
| | - David Gozal
- Department of Child Health, The University of Missouri School of Medicine, Columbia, MO 65212, USA
| | - Jorge Otero
- Unitat de Biofísica i Bioenginyeria, Facultat de Medicina i Ciències de la Salut, Universitat de Barcelona, 08036 Barcelona, Spain
- CIBER de Enfermedades Respiratorias, 28029 Madrid, Spain
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