Exit

Author Archives: Dietrich von Diemar

  1. Oxigraf O2N2 Oxygen Analyzer for On-Board Inert Gas Generation System (OBIGGS) validation

    Leave a Comment

    An On-Board Inert Gas Generation (OBIGG) system is now mandatory for many civilian and military aircraft to prevent the buildup of explosive conditions in fuel tanks by generating Nitrogen Enriched Air (NEA) to lower the oxygen content in the fuel tank headspace or ullage. Oxigraf provides a complete system for validating the performance of your OBIGG system.

    The Oxigraf O2N2 oxygen analyzer characterizes the performance of an OBIGG system over an entire flight profile from takeoff, climb, cruise, and descent by measuring the oxygen concentration at multiple sites in the fuel tanks every 16 seconds.

    The O2N2 analyzer is a specialized instrument evolved from Oxigraf oxygen analyzers commonly used for medical, scientific, and industrial process and safety applications. The patented laser diode absorption spectroscopy technology employed by Oxigraf is a natural fit for analyzing oxygen concentrations in a Jet-A fuel-air mixture as only light comes in contact with the gas sample, and the gas sample is maintained at a low temperature. The sensor responds in milliseconds, has no cross sensitivity to other gases, corrects automatically for changes in temperature and pressure, measures quickly over a wide dynamic range, and is insensitive to vibration.

    The aircraft OBIGG validation system is comprised of several rack mount Oxigraf O2N2 oxygen analyzers mounted in a rugged rack system along with manual cut-off valves, regulators, purge and calibration gas supplies, and a laptop computer with the OxiFTE system control and data logging software. Fuel tank sample kits with float valves and tubing to sample locations complete an installation.

    Additionally, the system has features to mitigate risks of escape of the sample gas, such as monitored nitrogen purging of the electronics enclosure. The OBIGG test system also features float valves at the fuel sample point to prevent ingestion of fuel at the sample location. Manual shut-off valves and test ports a low total system validation and operator intervention if necessary to remove the analyzers from contact with the fuel system.

    The number of O2N2 analyzers in a system depends on the number of sample points required in the fuel tank system to be monitored, with each O2N2 analyzer having four (4) sample channels. The example system shown below is comprised of twelve (12) channels mounted in an 18U chassis with the other parts of the system. Oxigraf can provide standard 12U and 18U chassis along with custom racks as required for the application.

    Please download your Oxigraf O2N2 OBIGGS Validation Brochure (pdf).

  2. Oxygen/CO2 Analyzer for Capnography

    Leave a Comment

    Model O2Cap Oxygen/CO2 Analyzer for Capnography:

    Monitoring of the concentration or partial pressure of oxygen and carbon dioxide (CO2) in respiratory gases requires fast response without overshoot. The Oxigraf Oxygen/CO2 Analyzers respond in less than a second. Electrochemical sensors may incorporate long averaging times, 20 or more seconds, for large, abrupt changes in oxygen concentration. Laser diode technology offers short response times to meet your capnographic requirements. The O2Cap family integrates an Oxigraf oxygen sensor with a NDIR CO2 sensor for dual gas measurements for research, medical and laboratory measurements.

     

     

    The Oxigraf O2Cap may be the O2/CO2 Analyzer you need:

    • Long life sensor, laser diode based sensor has a 10-year lifetime, does not require periodic replacement.
    • Fast response time, unit will respond to abrupt changes in O2 level in seconds.
    • NO errors due to vibration and movement
    • NO errors due to temperature changes
    • NO errors due to changes in barometric pressure
    • Accurately displays O2 levels for measuring 5-100% oxygen concentrations and 0 to 10% CO2

    Oxigraf works with clients across a wide range of industries to address their unique analyzing needs. Recently, for instance, we helped a client who was looking for a way to perform capnography tests with fast breath by breath measurement. The detailed case study is outlined below.

    The Problem:

    This client was looking for a way to measure and display the oxygen and CO2 concentrations in a gas sample drawn through the instrument. The company turned to Oxigraf for a reliable capnography solution.

    The Solution:

    The Oxigraf O2Cap is an analyzer that integrates a gas sampling system with sensors to measure and display the concentrations of oxygen and carbon dioxide in a sample as the percentage of a gas in the sample by volume. This method of expressing the concentration of a gas in a sample is also known as the percent volume fraction. In addition to the sampling and sensing systems in the O2Cap, the unit has a fluorescent display used for programming the unit and observing measurements, a keypad for programming the unit’s operation and calibration, and analog outputs that allow the unit to be connected to data recording units like the OxiSoft.

    When measuring the concentrations of oxygen and carbon dioxide in a gas, a sample is pumped from the input port on the front panel of the O2Cap, through the sample cell, and out an exhaust port on the back panel of the unit. Gas samples are drawn into the unit through an external filter on the input port that protects the sensors from contamination and through Nafion tubing on the filter that removes moisture from the samples that would affect the measurements and the unit’s calibration. The oxygen concentration of the gas in the sample cell is measured using laser diode absorption technology. The laser diode in the oxygen sensor produces light at a wavelength (760 nanometers) that is absorbed by oxygen. The light passes through the gas pumped into the sample cell and onto the surface of a detector.

    The output of the sensor is inversely proportional to the concentration of oxygen in the sample because the amount of light reaching the detector decreases as the concentration of oxygen in the sample increases. The O2Cap has a very fast response time that enables breath to breath analysis of gas concentrations because the unit analyzes the gas sample every 10 milliseconds, or 100 times per second. During each measurement interval, the analyzer is zeroed automatically by electronic tuning of the laser to a wavelength not absorbed by oxygen.

    The Oxigraf laser diode oxygen analyzer has a very long life span — especially compared to other options on the market — and requires no periodic replacement or servicing.

    The Oxigraf Model O2Cap (AL) oxygen analyzer is a diverting oxygen monitor.  Gas may be flowed under pressure with the sample pump off or on. The major components, pneumatic circuit, and flow path are shown in the block diagram above.

    The Result:

    The client’s problem was easily resolved with the use of our O2Cap analyzer model, which allowed for an accuracy of +/-0.2%. This client was very pleased with the system we provided and has since spread the word about our product line and capabilities to other customers in the medical industry.

    The O2Cap gas analyzer is calibrated at the factory and is ready to take measurements. Just connect the source of the gas sample to the gas analyzer with the proper connections and press the RUN key.

    The model O2Cap and O2CapB have luer type front panel gas sample input fitting for research applications. The model O2CapD have CPC O-Ring quick connect gas sample fittings for industrial applications.
    All of the Model O2Cap, O2CapB and O2CapD include a sampling pump that will draw a sample from atmospheric pressure; with an external flow control valve, it will accommodate pressurized gas up to 1.3 psig (17 psia or 120 kPa).
    An optional gas sampling valve allows the pump to draw a sample for a programmable number of seconds. This feature is useful for sampling from Modified Air Packaging (MAP).

    Oxigraf O2Cap Oxygen/CO2 Features:

    • Internal Sampling Pump.
    • Relay contacts can be used to control external equipment.
    • Relay contacts are Form C (SPDT), 5 A 250 VAC rating.
    • Analog 4 to 20 mA, analog 0 to 1 VDC, and digital RS-232 outputs. Visual, audible, and remote alarms for Low O2, High O2, Low Flow and System Check.
    • Samples and displays oxygen from 5 to 100% without range switching.
    • Calibrates electronically using 10%O2/5% CO2 and 100% O2 cal gases.
    • Electronic flow meter and display included.
    • Front panel CPC-Quick connect fitting.
    • Fast Response (< 1 sec) for prompt analysis.
    • Pressure and temperature correction automatical
    • No false oxygen readings with Ar, H2O, CO2, CO, or hydrocarbons.
    • Rugged laser diode absorption spectroscopy oxygen analysis.
    • Measures at low flows of 50 to 250 ml/min, conserving product gas.

    Learn More:

    Oxigraf has over 20 years of experience producing laser gas sensors and instruments and is the leading manufacturer of laser absorption spectroscopy sensors for oxygen gas measurement and analysis. Oxigraf O2iM Oxygen Safety Monitors have been widely adapted in hundreds of facilities since 2004, replacing a wide range of less reliable electrochemical sensors. Oxigraf O2 and CO2 sensors have been widely adapted by OEM manufacturers of medical respiratory gas monitors in order to measure breath waveforms, end-tidal gas values, anaerobic thresholds, VO2 max, and non-invasive cardiac outputs. For more information on our sensors, or to speak with an expert about your specific monitoring needs, contact the team today.

    Please download your Oxigraf Case Study: Oxygen/CO2 Analyzer for Capnography (pdf)

  3. Dräger makes Medical History with Breathing Apparatus

    Leave a Comment

    Dräger makes medical history with breathing apparatus

    Das Drägerwerk steht für 130 Jahre Firmen- und Familiengeschichte. Es stellt so begehrteste Produkte wie Beatmungsgeräte her.
    (The Drägerwerk stands for 130 years of company and family history. It manufactures such popular products as ventilators.)

    Die Corona-Pandemie rückt das Lübecker Familienunternehmen Dräger in den Fokus. Ihr begehrtes Produkt: Beatmungsgeräte.
    (The Lübeck-based family company Dräger is focusing on the corona pandemic. Their coveted product: ventilators.)

    Source: NDR German TV Documentary from: Apr 21, 2021

  4. Linde in India committed to augmenting medical oxygen supply in India

    Leave a Comment

    Linde India Limited and Praxair India Pvt. Ltd. are subsidiaries of Linde Plc. Linde plc. was created in October 2018 by merger of Praxair Inc. and Linde AG

    Linde in India committed to augmenting medical oxygen supply in India

    As India’s second wave of Covid-19 pandemic continues to escalate rapidly, existing supply chains are under enormous pressure in meeting the huge demand, especially to the most impacted parts of the nation. To address this critical need of the hour, Linde India and Praxair India are working on several large-scale initiatives in cooperation with the Government of India, relevant authorities, and industry partners at a national level.

    To help ease bottlenecks in distribution, Linde in India has embarked on two major operations. The company is working closely with the Indian Railways for its Roll-On-Roll-Off (RO-RO) service for faster transportation of medical oxygen to most critical need areas. Empty tankers are being ferried closer to its plant locations, where they are filled-up with much needed oxygen and the supply is then transported via roadways to various parts of India.

    Secondly, Linde is collaborating with its operations in the Asia Pacific, including in Singapore, China and Thailand, as well as various Indian industry partners to transport ISO cryogenic tankers from across the region to India. These containers can carry up to 20 tons of Liquid Oxygen over long distances, and upon arrival the containers will be conditioned and certified for liquid medical oxygen transport from Linde facilities. The tankers can also act as interim oxygen storages in remote areas that are facing oxygen scarcity.

    As of today, 8 containers have arrived in India and many more are expected to over the next few weeks.

    In addition, the company has taken steps to convert industrial volumes to medical oxygen ready to cater to the increasing need. Linde India and Praxair India Pvt. Ltd. collectively manage and operate several plants with Air Separation and manufacturing capabilities. These plants currently have a combined capacity of more than 2000 metric tons per day (MTPD) and are located across India.  Both the companies are also converting their Liquid Nitrogen and Liquid Argon tankers to augment the oxygen transportation capacities.

    Linde India and Praxair India Pvt. Ltd. have also fast-tracked installation works at partner hospitals to ease oxygen supply challenges there. Among others, they have recently installed a 20 KL tank at GMERS Medical College, Junagadh, and Gujarat. GMERS Medical College, Junagadh and another 20 KL tank at Sanjay Gandhi Post Graduate Institute, Lucknow.

    These are just some of the initiatives that Linde India and Praxair India Pvt. Ltd. are currently working on, and the company is currently having discussions with additional multiple stakeholders and industry partners so that more containers and necessary equipment can be brought into the country.

    Moloy Banerjee, Head Gases – South Asia, Linde South Asia Services Private Limited said, “As part of Empowered Group 2 (EG2), we are closely working with Government of India to produce and supply medical oxygen to various parts of the country. All possible efforts are being undertaken to address supply and transportation challenges and we are thankful to our international counterparts and industry partners such as the ITC Group, Tata Group and many more such organizations that are coming forward to lend their support in executing these initiatives. We are committed to support the government in this fight against the debilitating pandemic and will continue to explore other avenues to help address the challenges emerging during these trying times.”

    Read the Original Story in the Goa Chronicle from April 28, 2021:

    https://goachronicle.com/linde-in-india-committed-to-augmenting-medical-oxygen-supply-in-india/

    Thanks to our friends at Linde for their support #PrayForIndia

  5. Oxigraf Model O2Bio Oxygen and CO2 Gas Analyzers

    Leave a Comment

    Fast Gas Analyzer for Bio-Physical Applications and Bioreactors   

    Based on the Oxigraf Model O2Cap Oxygen and CO2 analyzer, the O2Bio is specifically designed to provide gas monitoring of Bioreactor headspace and off-gas streams. The unit will measure continuously from an off-gas vent or periodically via a gas sample valve to take small 10-15ml samples from the bioreactor headspace via keypad or digital interface control.

    The O2Bio integrates an Oxigraf tunable diode laser (TDL) oxygen sensor and a non-dispersive infrared (NDIR) CO2 sensor with a pump regulated gas sampling system. The analyzer features a bright vacuum fluorescent alphanumeric display (VFD), touch panel keypad, a rear 0-1VDC analog BNC output for O2 readings, rear terminal strip with limit detection relays and 4 – 20 mA analog outputs of O2 and CO2 reading, and a RS232 digital interface.


    O2Bio – Bioreactor Off-Gas Monitoring of O2 and CO2

    All inputs and outputs are CPC quick connect fittings with O-ring seals. Gas Inlet and Outlet with Swagelok or Luer fittings can be provided optionally.

    The Oxigraf sensor uses laser diode absorption technology to measure oxygen concentration in the gas sample. A laser diode produces light in the visible spectrum at 760 nanometers. Light at this wavelength is absorbed by oxygen. To analyze oxygen the laser beam is focused through the sample gas onto a detector.  Oxygen concentration is inversely proportional to the amount of light reaching the detector. An analysis is made every 10 ms.

    The analyzer automatically zeroes at each measurement interval by electronically tuning the laser to oxygen non-absorption wavelength. CO2 is measured using a NDIR based accessory sensor and integrated into our hardware.

    Oxygen measurements are made independent of sample pressure, gas temperature, and (in XC mode) other gases including Ar, He, H2, CO2 and H2O. Gases other than oxygen will not affect the measurement except for their dilution effect on the gas mixture.

    APPLICATIONS:

    • Fast Gas Analysis of: Oxygen and CO2
    • Overlay and Sparge Gas Controller for Bioreactors
    • Microbial Systems & Biofuel Development
    • Biomass Growth Rate and Substrate Consumption Monitoring
    • Anaerobic Fermentation
    • Stem Cell & Mammalian Cell Cultures

    Gas Sampling and Valve Control:

    The O2Bio/O2Bio-B Analyzers are specifically designed to provide gas monitoring of Bioreactor headspace and off-gas streams. The unit will measure continuously from an off-gas vent or periodically via a gas sample valve to take small 10-15ml samples from the bioreactor headspace via keypad or digital interface control.

    This Oxigraf analyzer is equipped with a solenoid sampling valve with 1 ms response time enabling sampling of very small sample volumes.

    PERFORMANCE SPECIFICATIONS:

    • Range:                      0 to 10% CO2; 5 to 100% Oxygen
    • Resolution:              0.1% in 0 to 100% O2 range; 0.01% in 0 to 10% CO2 range
    • Sample Flow:          50 to 250 ml/min pump on; 50 to 500 ml/min pump off.
    • Response Time:     Approximately 150 ms @ 250 ml/min flow (depending on electronic filter setting).
    • Valve Response:    1 ms for Solenoid sampling valve
    • Stability (4hrs):      ±0.2%.CO2 after 5 minute warm up; ±0.3%oxygen in XC mode, ±0.1% in oxygen LN mode
    • Dimensions:            7.5 x 3.0 x 14.0 inches (190 x 76 x 356 mm) WxHxD
    • Weight:                     7 pounds (3.2 kg)
    • Warranty:                One year

    Back Panel Interface:

    Back Panel O2Bio with rear terminal strip with limit detection relays:

    The power on/off switch (Press “I” for on, “O” for off), 12 VDC power input jack, service interface, terminal block interface, and a gas outlet port are located on the instrument back panel.  Power is supplied by an external 12 Volt, 2 Amp CSA Level 3 power supply. The RS – 232 port is provided to interface with a computer.

    Calibration Kit:

    Calibration Kit includes certified concentration gas cylinders, preset flow regulators, and tubing with connectors which mate with the analyzer and gas cylinder. The tubing assembly includes a fine flow needle valve. Instrumentation grade, certified calibration gas meets FDA standards for USP oxygen analyzers. Each cylinder provides approximately 3 months of daily calibrations. Calibration gas is shipped direct from the gas supplier.

    Please download your Oxigraf Model O2Bio/O2Bio-B Oxygen and CO2 Gas Analyzers Brochure (pdf)

  6. Study protocol: randomised controlled trial evaluating exercise therapy as a supplemental treatment strategy in early multiple sclerosis the Early Multiple Sclerosis Exercise Study (EMSES)

    Leave a Comment

    Abstract

    Introduction

    In the relapsing remitting type of multiple sclerosis (MS) reducing relapses and neurodegeneration is crucial in halting the long-term impact of the disease. Medical disease-modifying treatments have proven effective, especially when introduced early in the disease course. However, patients still experience disease activity and disability progression, and therefore, supplemental early treatment strategies are warranted. Exercise appear to be one of the most promising supplemental treatment strategies, but a somewhat overlooked ‘window of opportunity’ exist early in the disease course. The objective of this study is to investigate exercise as a supplementary treatment strategy early in the disease course of MS.

    Methods and analysis

    The presented Early Multiple Sclerosis Exercise Study is a 48-week (plus 1-year follow-up) national multicentre single-blinded parallel group randomised controlled trial comparing two groups receiving usual care plus supervised high-intense exercise or plus health education (active control). Additionally, data will be compared with a population-based control group receiving usual care only obtained from the Danish MS Registry. The primary outcomes are annual relapse rate and MRI derived global brain atrophy. The secondary outcomes are disability progression, physical and cognitive function, MS-related symptoms, and exploratory MRI outcomes. All analyses will be performed as intention to treat.

    Figure 1 a: Primary outcome, b: Part of the Multiple Sclerosis Functional Composite, c: Outcomes available in the population based registry database.

    Participants

    Recruitment and eligibility

    Patients with MS will be recruited via six Danish regional MS clinics (Aarhus University Hospital, Odense University Hospital, Clinics of Southern Denmark (Sønderborg, Esbjerg, Kolding), and Hospital Unit of Western Denmark), or via social media groups and events related to the Danish MS Society. In all cases, patients will be supplied with a leaflet explaining the rationale, design and content of the study and inviting them to participate. Those interested in participation will receive detailed written information as well as a leaflet from the National ethical committee explaining their rights as a participant in a health science research project. Furthermore, the project coordinator will contact participants by phone to explain the study, give the opportunity to ask questions, and to screen according to the inclusion criteria. Specifically, patients have to fulfil the following: (1) 18–60 years of age, (2) ≤2 years since clinical diagnosis with relapsing remitting MS and (3) no relapses or changes in medication ≤8 weeks prior to inclusion. Patients will be excluded if they: (1) are pregnant, or (2) have comorbidities or other issues thought to hinder participation in high intensity exercise activities. Finally, project nurses from the regional MS clinics confirm eligibility based on the patients’ medical records, and patients sign informed consent (standard formula from the Danish National Research Ethics Committee, see online supplemental material before inclusion.

    Table 1 Summary of the supervised exercise therapy intervention

    Primary outcomes

    The overall primary outcomes of the study are annual relapse rate and MRI-derived annual global brain atrophy rate.

    Relapse rate

    The number of relapses in the study period is obtained from the medical records of the included patients. This will be done in collaboration with the respective MS clinics, and all relapses will be confirmed by a neurologist. According to the Danish national neurological association, a relapse is defined as new symptoms or worsening of existing symptoms, causing neurological dysfunction for a minimum of 24 hours without any signs of infection or fever. This exacerbation must be preceded by a stable 4-week period. The annual relapse rate is calculated for each patient by dividing 365 days with the number of days in the study and multiplying by the number of relapses in the study period. Due to the clinically meaningful definition of this outcome any potential changes in the relapse rate will be considered clinically meaningful.

    Secondary outcomes

    Disability progression

    Neurological impairments in MS can be assessed by grading the impairment of eight different functional systems (pyramidal, cerebellar, brain stem, sensory, bowel and bladder, visual, cerebral, other) to rate the total EDSS score. The EDSS score is considered the gold standard when assessing disability and disease progression in MS and it is used routinely as a clinical endpoint in trials of DMTs. In this study, the EDSS score will be determined for each participant by trained neurologists at the six collaborative MS clinics during routine clinical visits. Therefore, the EDSS score nearest to the date of inclusion, to the date of completion, and to the date of 1 year since completion will be used to assess the progression of disabilities. However, recent studies have pointed out limitations in the EDSS score such as insufficient inter-rater and intrarater reproducibility and a low responsiveness—especially at the lower end of the scale. Therefore, the main measure of disability progression will be the Multiple Sclerosis Functional Composite (MSFC).

    Inflammatory and neurodegenerative biomarkers

    Blood samples will be collected in resting state at baseline, after 24 weeks, after 48 weeks, and again at 1-year follow-up. Patients will be allowed a minimum of 5 min supine rest before blood collection from the antecubital vein. Blood samples will be collected in ethylenediaminetetraacetic acid-treated tubes, resting for 90 min, and subsequently centrifuged at 1200 g for 10 min. Thereafter serum will be extracted and divided into five aliquots and stored at −80°C until further analyses.

    Analysis of blood samples will be exploratory and aim to investigate the effects of exercise on relevant biomarkers, such as Glial Fibrillar Acid Protein, proinflammatory and anti-inflammatory markers (eg, interleukin-6, interleukin-10, interleukin-17, tumour necrosis factor-α) as well as neurodegenerative (eg, neurofilament light chain) and neurotrophic markers (eg, brain-derived neurotrophic factor, insulin-like growth factor).

    Table 2 Overview of assessments and the order of testing at different time points

    DISCUSSION AND PERSPECTIVES

    The presented study seeks to investigate supervised exercise as a supplemental treatment strategy early in the disease course of relapsing remitting MS. Effects of the
    intervention will primarily be investigated on measures of disease activity and neurodegeneration, and secondarily on measures of disability progression, cognitive and physical function, and symptoms of fatigue. Efforts investigating the effects of exercise beyond rehabilitation (eg, as a supplemental disease-modifying strategy) are warranted and an overlooked ‘window of opportunity’ early in the disease course for MS exercise therapy have previously been identified. Importantly, the present study addresses both of these issues making the approach novel and innovative. Furthermore, the present study complies with the recommendations from
    recent publications guiding the field of MS rehabilitation and exercise aligning the methodology with the current stage of the literature. Specifically, the study has
    clearly defined primary outcomes and sample size calculations based hereupon (resulting in a large-scale exercise study), includes a rather long-term supervised exercise intervention and a well-monitored active control group (eg, importantly controlling the physical activity level of participants).

    In summary, this is the first-ever study to investigate the effects of exercise in the very early stages of MS and thereby taking a more preventive approach aiming at lowering the disease activity more than medical DMTs alone aiming at maintaining (or even improving) functional and neurological reserve capacity. We expect the present study to hold the potential to change the current clinical practice regarding exercise therapy with MS. In particular, the present study may provide the first data supporting a warranted shift of paradigm where exercise will be considered a supplemental treatment strategy from an early timepoint in the disease course of MS. If these early exercise efforts show additional disease-modifying and neuroprotective effects, this is inherently of major interest to the individual MS patient, yet also to the healthcare system. While medical DMTs constitute the majority of healthcare costs for patients with mild MS early exercise efforts
    may be a cost-effective supplemental treatment strategy to minimise disability progression and the huge-related costs. Another highly important perspective of early
    exercise efforts as a supplemental treatment strategy in MS is the improvement of general health of the patients and the derived reduction in the increased risk of lifestyle-related comorbidities observed in patients with MS.

                     

    Exercise Biology, Department of Public Health, Aarhus University, Aarhus, Denmark
    Exercise Biology, Department of Public Health, Aarhus University, Aarhus, Denmark.
    3 The MR Research Centre, Aarhus University Hospital, Aarhus N, Denmark.
    4 Center of Functionally Integrative Neuroscience, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark.
    5 The Multiple Sclerosis Clinic, Department of Neurology, Aarhus University Hospital, Aarhus, Denmark.
    6 Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark.

    11 Jan 2021, 11(1):e043699

  7. Efficacy and safety of oxygen-sparing nasal reservoir cannula for treatment of pediatric hypoxemic pneumonia in Uganda: a pilot randomized clinical trial

    Leave a Comment

    Abstract

    Background: Oxygen is an essential therapy for hypoxemia but is scarce in low-income settings. Oxygen conserving devices optimize delivery, but to date have been designed for adults in high-income settings. Here we present the development and clinical pilot study of an oxygen-sparing nasal reservoir cannula (OSNRC) for pediatric use in low-income settings.

    Methods

    (1) Pre-clinical development of a novel OSNRC using a simulated respiratory circuit with metabolic simulator and anatomically accurate face-airway models. Simulated breathing waveforms were designed based on airway resistance, lung compliance, respiratory rate, and tidal volume of spontaneous breathing for three disease conditions.
    (2) Pilot, randomized, controlled, non-blinded, cross-over study of the OSNRC vs standard nasal cannula (SNC) among children hospitalized with hypoxemic pneumonia in Uganda. Eight children were randomized to OSNRC followed by SNC, and eight were randomized to SNC followed by OSNRC.

    Results

    The laboratory simulation showed that the OSNRC provided the same or higher fraction of inspired oxygen at approximately 2.5-times lower flow rate compared to SNC. The flow savings ratio exhibited a linear relationship with the OSNRC volume to tidal volume ratio with a slope that varied with breathing waveforms. The range of performance from different breathing waveforms defined a performance envelope of the OSNRC. Two mask sizes (30 mL and 50 mL) provided sufficient coverage for patients between the 3rd and 97th percentile in our targeted age range. In the clinical pilot study, the rise in capillary blood pCO2 was similar in the OSNRC and SNC groups, suggesting that the OSNRC was not associated with CO2 retention. There were no significant differences between OSNRC and SNC with respect to clinical adverse events, lactate levels, pH, and SpO2. The OSNRC group had a higher mean SpO2 than the SNC group (adjusted mean difference, 1.4, 95% confidence interval 1.1 to 1.8), showing oxygen delivery enhancement.

    Conclusion

    The OSNRC enhances oxygen delivery without causing CO2 retention and appears to be well-tolerated by pediatric patients. If safety, efficacy and tolerability are confirmed in larger trials, this device has the potential to optimize oxygen delivery in children in low-resource settings, reducing the global burden of pediatric pneumonia.

    Authors: Jerry Mulond1 , Stella Maleni1, Hellen Aanyu-Tukamuhebwa2, Ezekiel Mupere2,3, Alfred Onubia Andama4, Chin Hei Ng5, Stephen Burkot5, Ella M. E. Forgie6, Qaasim Mian6, Christine M. Bachman5, Gerard Rummery7, Daniel Lieberman5, David Bell5,8, Michael T. Hawkes6,9,10,11,12*† and Akos Somoskovi5†

    1 Infectious Diseases Research Collaboration, Kampala, Uganda.
    2 Department of Pediatrics and Child Health, Mulago National Referral Hospital and Makerere University, Kampala, Uganda.
    3 Department of Pediatrics, Makerere, University College of Health Sciences, Kampala, Uganda.
    4 Department of Medicine, Makerere University College of Health Sciences, Kampala, Uganda.
    5 Intellectual Ventures, Global Good Fund, Bellevue, WA, USA.
    6 Department of Pediatrics, University of Alberta, 3-588D Edmonton Clinic Health Academy, 11405 87 Ave NW, Edmonton, Alberta T6G 1C9, Canada.
    7 ResMed Ltd., Bella Vista, Australia.
    8 Present address: Issaquah, USA.
    9 Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Canada.
    10 School of Public Health, University of Alberta, Edmonton, Canada.
    11 Stollery Science Lab, Edmonton, Canada.
    12 Women and Children’s Health Research Institute, Edmonton, Canada

    * Correspondence: mthawkes@ualberta.ca †
    Michael T. Hawkes and Akos Somoskovi contributed equally to this work

               

    Article published in: BMC Pulmonary Medicine volume 20, Article number: 230 (2020)

    Efficacy and safety of oxygen-sparing nasal reservoir cannula for treatment of pediatric hypoxemic pneumonia in Uganda: a pilot randomized clinical trial

  8. Watch the Thornhill Medical COVID-19 response in action

    Leave a Comment

    Oxigraf is proud of supporting the Thornhill Medical COVID-19 Response Action Plan!

    Thornhill Medical is answering the call to support the fight against COVID-19, producing and delivering the MOVES® SLC™ devices to help save lives across the country. Combining an O₂ concentrator, ventilator, suction & vital signs monitoring in a rugged battery-powered portable unit, MOVES® SLC™ is a proven, mobile integrated life support technology. It’s Canadian advanced innovation at its best.

    Watch Thornhill Medical in action:
    https://thornhillmedical.com/en/news/dec-17-2020-thornhill-medical-covid-19-response-in-action/

  9. CMTC welcomes Oxigraf to the Made in California Program!

    Leave a Comment

    Oxigraf is now part of the Made in California Program, California’s trusted resource for a thriving manufacturing industry. Made in California is dedicated to highlighting the contributions of California’s manufacturers and raising awareness of the products made in the Golden State. Oxigraf is proud of contributing to the success of keeping manufacturing in California.

    CMTC is affiliated with the National Institute of Standards and Technology (NIST) and is part of the Hollings Manufacturing Extension Partnership (MEP) Program. The MEP Program is an outgrowth of the U.S. Government policy to develop and deploy technology, management, and technical expertise for improving the competitiveness of manufacturing for small and medium-sized companies.

    Please feel free to visit Oxifgraf’s profile page on the California Manufacturing Technology Consulting website!

  10. NASA’s SpaceX Crew-1 Astronauts Headed to International Space Station

    Leave a Comment

    A SpaceX Falcon 9 rocket carrying the company’s Crew Dragon spacecraft is launched on NASA’s SpaceX Crew-1 mission to the International Space Station on Sunday, Nov. 15, 2020, at NASA’s Kennedy Space Center in Florida. Credits: NASA/Joel Kowsky

    An international crew of astronauts is en route to the International Space Station following a successful launch on the first NASA-certified commercial human spacecraft system in history. NASA’s SpaceX Crew-1 mission lifted off at 7:27 p.m. EST Sunday from Launch Complex 39A at the agency’s Kennedy Space Center in Florida.

    The SpaceX Falcon 9 rocket propelled the Crew Dragon spacecraft with NASA astronauts Michael Hopkins, Victor Glover, and Shannon Walker, along with Soichi Noguchi of the Japan Aerospace Exploration Agency (JAXA), into orbit to begin a six-month science mission aboard the space station.

    “NASA is delivering on its commitment to the American people and our international partners to provide safe, reliable, and cost-effective missions to the International Space Station using American private industry,” said NASA Administrator Jim Bridenstine. “This is an important mission for NASA, SpaceX and our partners at JAXA, and we look forward to watching this crew arrive at station to carry on our partnership for all of humanity.”

    The Crew Dragon spacecraft, named Resilience, will dock autonomously to the forward port of the station’s Harmony module about 11 p.m. Monday, Nov. 16. NASA Television and the agency’s website are providing ongoing live coverage through docking, hatch opening, and the ceremony to welcome the crew aboard the orbiting laboratory.

    “I could not be more proud of the work we’ve done here today,” said Gwynne Shotwell, president and chief operating officer of SpaceX. “Falcon 9 looked great, Dragon was dropped off into a beautiful orbit about 12 minutes into the mission, and we’ll get more data as we go.”

    NASA & SpaceX – Dragon Crew-1 Mission patch (Credit: NASA)

    The Crew-1 mission is the first of six crewed missions NASA and SpaceX will fly as part of the agency’s Commercial Crew Program. This mission has several firsts, including:

    • The first flight of the NASA-certified commercial system designed for crew transportation, which moves the system from development into regular flights;
    • The first international crew of four to launch on an American commercial spacecraft;
    • The first time the space station’s long duration expedition crew size will increase from six to seven crew members, which will add to the crew time available for research; and
    • The first time the Federal Aviation Administration has licensed a human orbital spaceflight launch. The astronauts named the Crew Dragon spacecraft Resilience, highlighting the dedication teams involved with the mission have displayed and to demonstrate that when we work together, there is no limit to what we can achieve. They named it in honor of their families, colleagues, and fellow citizens.

    “Watching this mission launch is a special moment for NASA and our SpaceX team,” said Steve Stich, manager of NASA’s Commercial Crew Program. “We are looking forward to getting this crew to station to continue our important work, and I want to thank the teams for the amazing effort to make the next generation of human space transportation possible.”

    During flight, SpaceX commands the spacecraft from its mission control center in Hawthorne, California, and NASA teams monitor space station operations throughout the flight from the Mission Control Center at the agency’s Johnson Space Center in Houston.

    Hopkins, Glover, Walker, and Noguchi will join the Expedition 64 crew of Commander Sergey Ryzhikov and Flight Engineer Sergey Kud-Sverchkov, both of the Russian space agency Roscosmos, and Flight Engineer Kate Rubins of NASA.

    “It is an honor to have our Japanese astronaut launch on this Crew-1 Dragon as the first astronaut of the International Partner participating in the ISS program,” said Hiroshi Sasaki, JAXA vice president. “We look forward to having him conduct lots of science and demonstrate the technology, for here on Earth and for the future. I would also like to thank NASA and SpaceX for their tremendous effort to make this happen.”

    Rubins, Hopkins, Glover, Walker, and Noguchi will participate in a live crew news conference from orbit at 9:55 a.m. Thursday, Nov. 19, on NASA TV and the agency’s website.

    Crew-1 Astronauts

    SpaceX’s Crew-1 mission for NASA will fly (from left) astronauts Mike Hopkins, Soichi Noguchi, Shannon Walker, and Victor Glover to orbit aboard a Crew Dragon spaceship. Credit: NASA

    Michael Hopkins is commander of the Crew Dragon spacecraft and the Crew-1 mission. Hopkins is responsible for all phases of flight, from launch to re-entry. He also will serve as an Expedition 64 flight engineer aboard the station. Selected as a NASA astronaut in 2009, Hopkins spent 166 days in space as a long-duration crew member of Expeditions 37 and 38 and completed two spacewalks totaling 12 hours and 58 minutes. Born in Lebanon, Missouri, Hopkins grew up on a farm outside Richland, Missouri. He has a bachelor’s degree in aerospace engineering from the University of Illinois, and a master’s degree in aerospace engineering from Stanford University. Before joining NASA, Hopkins was a flight test engineer with the U.S. Air Force. Follow Hopkins on Twitter.

    Victor Glover is the pilot of the Crew Dragon spacecraft and second-in-command for the mission. Glover is responsible for spacecraft systems and performance. He also will be a long-duration space station crew member. Selected as an astronaut in 2013, this is his first spaceflight.

    The California native holds a Bachelor of Science degree in general engineering from California Polytechnic State University, a Master of Science degree in flight test engineering and a master’s degree military operational art and science from Air University, and a Master of Science degree in systems engineering from Naval Postgraduate School. Glover is a naval aviator and was a test pilot in the F/A‐18 Hornet, Super Hornet, and EA‐18G Growler aircraft. Follow Glover on Twitter and Instagram.

    Shannon Walker is a mission specialist for Crew-1. As a mission specialist, she works closely with the commander and pilot to monitor the vehicle during the dynamic launch and re-entry phases of flight. She also is responsible for monitoring timelines, telemetry, and consumables. Once aboard the station, Walker will become a flight engineer for Expedition 64. Selected as a NASA astronaut in 2004, Walker launched to the International Space Station aboard the Russian Soyuz TMA-19 spacecraft as the co-pilot, and spent 161 days aboard the orbiting laboratory. More than 130 microgravity experiments were conducted during her stay in areas such as human research, biology, and materials science. A Houston native, Walker received a Bachelor of Arts degree in physics from Rice University, as well as a Master of Science degree and a doctorate in space physics, both from Rice University, in 1992 and 1993, respectively.

    Soichi Noguchi also is a mission specialist for Crew-1, working with the commander and pilot to monitor the vehicle during the dynamic launch and re-entry phases of flight, and keeping watch on timelines, telemetry and consumables. Noguchi also will become a long-duration crew member aboard the space station. He was selected as an astronaut candidate by the National Space Development Agency of Japan (NASDA, currently the Japan Aerospace Exploration Agency) in May 1996. Noguchi is a veteran of two spaceflights. During STS-114 in 2005, Noguchi became the first Japanese astronaut to perform a spacewalk outside the space station. He performed a total of three spacewalks during the mission, accumulating 20 hours and 5 minutes of spacewalking time. He launched aboard a Soyuz spacecraft in 2009, to return to the station as a long-duration crew member. The Crew Dragon will be the third spacecraft Noguchi has flown to the orbiting laboratory. Follow Noguchi on Twitter and Instagram.

    Mission Objectives

    The Crew-1 astronauts’ zero-g indicator, “The Child” (“Baby Yoda”) from the Disney+ Star Wars series “The Mandalorian” floats into pilot Victor Glover’s seat on the SpaceX Crew Dragon. (NASA TV)

    The crew will conduct science and maintenance during a six-month stay aboard the orbiting laboratory and will return in spring 2021. It is scheduled to be the longest human space mission launched from the United States. The Crew Dragon spacecraft is capable of staying in orbit for at least 210 days, as a NASA requirement.

    Crew Dragon also is delivering more than 500 pounds of cargo, new science hardware and experiments inside, including Food Physiology, a study of the effects of an optimized diet on crew health and, Genes in Space-7, a student-designed experiment that aims to better understand how spaceflight affects brain function, enabling scientists to keep astronauts healthy as they prepare for long-duration missions in low-Earth orbit and beyond.

    Among the science and research investigations the crew will support during its six-month mission are a study using chips with tissue that mimics the structure and function of human organs to understand the role of microgravity on human health and diseases and translate those findings to improve human health on Earth, growing radishes in different types of light and soils as part of ongoing efforts to produce food in space, and testing a new system to remove heat from NASA’s next generation spacesuit, the Exploration Extravehicular Mobility Unit (xEMU).

    During their stay on the orbiting laboratory, Crew-1 astronauts expect to see a range of uncrewed spacecraft including the next generation of SpaceX cargo Dragon spacecraft, the Northrop Grumman Cygnus, and the Boeing CST-100 Starliner on its uncrewed flight test to the station. They also will conduct a variety of spacewalks and welcome crews of the Russian Soyuz vehicle and the next SpaceX Crew Dragon in 2021.

    At the conclusion of the mission, the Crew-1 astronauts will board Crew Dragon, which will then autonomously undock, depart the space station, and re-enter Earth’s atmosphere. Crew Dragon also will return to Earth important and time-sensitive research. NASA and SpaceX are capable of supporting seven splashdown sites located off Florida’s east coast and in the Gulf of Mexico. Upon splashdown, the SpaceX recovery ship will pick up the crew and return to shore.

    NASA’s Commercial Crew Program is delivering on its goal of safe, reliable, and cost-effective transportation to and from the International Space Station from the United States through a partnership with American private industry. This partnership is changing the arc of human spaceflight history by opening access to low-Earth orbit and the International Space Station to more people, more science, and more commercial opportunities.

    The space station remains the springboard to NASA’s next great leap in space exploration, including future missions to the Moon and, eventually, to Mars. For more than 20 years, humans have lived and worked continuously aboard the International Space Station, advancing scientific knowledge and demonstrating new technologies, making research breakthroughs not possible on Earth. As a global endeavor, 242 people from 19 countries have visited the unique microgravity laboratory that has hosted more than 3,000 research and educational investigations from researchers in 108 countries and areas.

    Crew Dragon Resilience (Credit: Wikipedia)

    Congratulations to our friends at #NASA and #SpaceX from #Oxigraf

    Source: NASA –  November 15, 2020; RELEASE 20-114:

    https://www.nasa.gov/press-release/nasa-astronauts-launch-from-america-in-historic-test-flight-of-spacex-crew-dragon

© 2024 Oxigraf, Inc. All Rights Reserved  |  Site Created by Thomas Marketing Serivces   Powered by Navigator Platform