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venturi injector

Laura A Enzor, Cheryl Hankins, Deborah N Vivian, William S Fisher, Mace G Barron
Projected increases in ocean p CO2 levels are anticipated to affect calcifying organisms more rapidly and to a greater extent than other marine organisms. The effects of ocean acidification (OA) have been documented in numerous species of corals in laboratory studies, largely tested using flow-through exposure systems. We developed a recirculating ocean acidification exposure system that allows precise p CO2 control using a combination of off-gassing measures including aeration, water retention devices, venturi injectors, and CO2 scrubbing...
February 1, 2018: Journal of Experimental Marine Biology and Ecology
Richard D Branson, Jeff Griebel, Dario Rodriquez
BACKGROUND: Safe and effective delivery of inhaled nitric oxide (INO) requires the appropriate interface of ventilator and INO delivery device. METHODS: We compared INO delivery using four configurations with the Transport Sinusoidal Bronchotron® and INOmax DSIR Plus® in a lung model. Ventilator settings and lung model values were held constant. Delivered NO, NO2 , and inspired oxygen (FIO2 ) were measured. The mean difference between set and measured NO was calculated and compared using ANOVA...
March 2018: Pediatric Pulmonology
W Krusong, S Yaiyen, S Pornpukdeewatana
AIMS: To evaluate the comparative impact of high initial concentrations of acetic acid (AAi ) and of ethanol (ETi ) on acetification rate (ETA). METHODS AND RESULTS: Acetic acid bacteria (AAB) were cultivated in a 100-l internal Venturi injector bioreactor. To quantify the oxygen availability, the 1.0 l min(-1) air inflow rate for the start-up phase (25 l) while 3·0 l min(-1) for the operational phase (75 l) achieved a high oxygen transfer coefficient (kL a). Changes in cell wall by TEM images and the remained ADH and ALDH activities confirmed the high acid tolerance ability of AAB...
March 2015: Journal of Applied Microbiology
Chunying Dong, Jun Zhu, Xiao Wu, Curtis F Miller
The effect of aerator module configuration, liquid flow rate and diffuser submergence on oxygen transfer efficiency was examined in a surface aeration system with venturi injectors using the clean water test. Six venturi aerator modules were evaluated and the results indicated that better aeration efficiencies could be achieved by simply changing the way the venturi aerators were connected. Among all the configurations examined (modules a-f), two and three aerators connected in parallel (modules d, e and f) were able to bring more oxygen into water than the others...
June 2012: Environmental Technology
C Dong, J Zhu, C F Miller
Six aerator modules constructed using venturi air injectors connected in either series or parallel were evaluated and compared for their oxygen transfer coefficients (OTC), standard oxygen transfer rate (SOTR), and standard oxygenation efficiency (SOE) determined by clean water tests. Modules in series (module a, b, c) included one, two, and three venturi injectors, respectively. The aerator module with two (module d) and three (module e, f) venturi injectors in parallel were used, while module f had less friction and more even flow rate in each line compared with module e...
2009: Water Science and Technology: a Journal of the International Association on Water Pollution Research
M Oliveira, C Queda, E Duarte
An air micro-bubble bioreactor (AMBB) using a free self-adapted microbial population, 15 dm3 working volume, was used for aerobic treatment of winery wastewater. This reactor utilizes a Venturi injector in conjunction with mass transfer multiplier nozzles, which allow an efficient oxygen transfer. The reactor can operate in batch or continuous conditions. The dynamics of chemical oxygen demand (COD), biomass and total contents of polyphenolic compounds was followed throughout each trial. The wastewater COD ranged between 4...
2009: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Lucia Scorolli, Luigi Scorolli, Raffaella Ricci, Lillina Di Silvestre, Mariachiara Morara, Vincenzo Della Valle, Renato Meduri
PURPOSE: To assess the folding and implantation of the single-piece EasAcryl 1 intraocular lens (IOL) and the maintenance of the tunnel structure and capsular bag stability after implantation. SETTING: S. Orsola Hospital Department of Pathophysiologic Optics, University of Bologna, Bologna, Italy. METHODS: This study comprised 300 cases of EasAcryl 1 IOL implantation. First, a 3.2 mm corneal incision was made according to preoperative astigmatism followed by a 5...
March 2002: Journal of Cataract and Refractive Surgery
V G van Ommen, A A van den Bos, M Pieper, P den Heyer, M R Thomas, S Ozbeck, F W Bär, H J Wellens
This study evaluates the feasibility and safety of a 6Fr hydrodynamic thrombectomy catheter, the Hydrolyser, in native coronary arteries and aortocoronary bypass grafts. With use of a conventional contrast injector, saline solution is injected into the narrow lumen of the catheter which makes a 180 degrees bend at the tip. The resultant high-velocity jet (150 km/hour) is directed over a sidehole near the tip into a wide exhaust lumen. As a consequence of the Venturi effect, thrombus is sucked into that sidehole, fragmented, and removed through the wide exhaust lumen into a collection bag...
April 15, 1997: American Journal of Cardiology
B Eckerbom, C E Lindholm
UNLABELLED: The ISO 8600-2-1 draft standard concerns measuring methods for ventilation properties in rigid bronchoscopes. Two lung models were designed in accordance with this draft, one for conventional ventilation, and the other for jet-ventilation (venturi ventilation). Lung model I: An air supply was connected to a 4 liter container. The test object (bronchoscope) was exposed to air flowing out of the container through the bronchoscope, and the pressure in the container was recorded...
July 1994: Acta Anaesthesiologica Scandinavica
P Nandi
Between January 1977 and December 1978, 24 patients with recurrent or chronic spontaneous pneumothorax were treated in the Hong Kong University Cardiothoracic Centre at Grantham Hospital by talc pleurodesis. Talc poudrage had been carried out under local infiltration anesthesia by a technique that utilizes the Venturi principle and the help of an oxygen injector, used normally for ventilating a patient during bronchoscopy with a rigid bronchoscope. By using this method of poudrage, a uniform application of the powder over the whole pleural surface can be achieved and successful pleurodesis can be obtained in all patients under local anesthesia...
April 1980: Chest
S Ramanathan, J Arismendy, S Gandhi, J Chalon, H Turndorf
A coaxial jet ventilation catheter capable of entraining liquid water by Venturi effect was assembled by inserting an epidural catheter (water injector tube) into a 69-cm-long, 3-mm-i.d., outer jet delivery tube. Gas jet flow in the outer tube produced a negative pressure in the inner injector tube. The entrainment pressure could be varied by increasing or decreasing the distance between the injector and jet portals. The quantity of entrained water could thus be regulated between 8 +/- 1 to 44 +/- 2 mg/L of gas by decreasing this distance from 3...
August 1982: Anesthesia and Analgesia
P Woo, S Eurenius
Venturi jet ventilation with the oxygen injector needle placed within the lumen of the laryngoscope was studied systematically in two dogs undergoing repeated general anesthesia suspension laryngoscopy. Using a total body plethysmograph, the effect of changes of needle angle, position and its effect on tidal volume delivery were measured. The changes of pressure regulator, flow rate and needle size were correlated with the volume delivery. Intratracheal pressure during Venturi ventilation was measured. Correlation of arterial blood gases and minute ventilation with the system was done...
November 1982: Annals of Otology, Rhinology, and Laryngology
B Dalens, A Labbe, J P Haberer, G Vanneuville
The authors report an original procedure for respiratory assistance during flexible bronchoscopy in infants and toddlers. The injector is directly connected with the operating channel of the bronchoscope. Ventilation parameters are pre-regulated before introducing the fiberscope into the respiratory tree. Insufflation volumes are restricted to 5 ml/kg at the tip of the bronchoscope, on a basis of 40 to 60 cycles per minute, according to children's age. A venturi effect may occur as discrepancy between bronchi and the size of the fiberscope does exist...
November 1984: Cahiers D'anesthésiologie
P Woo, C W Vaughan
In this preliminary study with seven dogs, ventilation with a Sanders bronchoscope attachment coupled to the Norton metal endotracheal tube and use of a jet O2 injector system proved adequate for sustained oxygenation and acid-base balance. This system is shown to be superior to the conventional anesthesia volume ventilator when used with the cuffless metal endotracheal tube. The ventilatory capability can be easily adjusted upward and downward by changing the driving pressures of the reducing valve. Peak intratracheal and transtracheal pressure measurements show the pressures encountered to be similar to those of conventional volume ventilation techniques...
October 1983: Otolaryngology—Head and Neck Surgery
J M Hermens, M J Bennett, C A Hirshman
Laser surgery offers several advantages to the surgeon and patient: microscopic precision, a bloodless operative field, and complete sterility. While the majority of procedures pose few problems beyond protection of the eyes of operating room personnel and patients, microlaryngeal surgery with the CO2 laser requires very careful anesthetic management. A preoperative visit to determine the degree of existing airway obstruction is mandatory in deciding the safest anesthetic technique. Continued communication and cooperation between the surgeon and anesthesiologist throughout the procedure will help minimize the conflicting needs for airway access and ventilation...
February 1983: Anesthesia and Analgesia
I A Sloan, M E McLeod
The use of the Sanders venturi system during bronchoscopy in adults has been studied extensively. Its use in paediatric bronchoscopy has been limited because small changes in the characteristics of the system may produce large changes in the patient. With jet ventilation, peak inflation pressures and flow rates are influenced by the driving pressure, diameter and shape of the bronchoscope, the diameter of the injector and its length and angle from the axial line of the bronchoscope. Storz 3 mm, 4 mm and 5 mm rigid fibreoptic bronchoscopes were evaluated in a test lung with an injector of 1...
January 1985: Canadian Anaesthetists' Society Journal
S Jørgensen, L K Hansen
The Venturi is a flow-accelerating injector, activated by fresh gas inflow from the anaesthetic machine. The Venturi entrains exhaled gas from the patient through a soda-lime canister, and carries it to the patient together with fresh gas. The Venturi circuit is a Mapleson D system and the fresh gas requirements are roughly 30 ml kg-1 min-1 for anaesthetized, relaxed, adult patients under controlled ventilation.
April 1985: Acta Anaesthesiologica Scandinavica
F Weber, E Simon, J G Heidelbach
Results of experimental and methodical investigations of so-called "Injector-Ventilation" or jet ventilation verify procedures' safety regarding ventilation and anaesthesia management. Classification of jet ventilation permits delimitation to IPPV and different methods of HFV. Resulting from considerations, especially based on reported insignificancy of "Venturi-Effect" under clinical conditions, authors suggest use of unitary term "Normo-Frequent Jet Ventilation" (NFJV).
1986: Zeitschrift Für Erkrankungen der Atmungsorgane
J Jakubaszko, P Christensen, S Jørgensen
Including a venturi injector in a Magill breathing attachment reduces the requirement of compressed gases to 40% of that normally used: 100-120 ml x kg-1 x min-1. The entrainment of ambient air through the venturi injector enables the supply of an adequate flow of gas mixture to the patient. In 10 awake volunteers and 12 patients under N2O/halothane anaesthesia, it was demonstrated that a fresh gas flow from the anesthetic machine of 40 ml x kg-1 x min-1 is sufficient to prevent rebreathing during spontaneous respiration, when the venturi injector is included in the Magill attachment...
July 1989: Acta Anaesthesiologica Scandinavica
K Berger, H P Heilmann
Basing on Sander's inject-ventilation and Venturi's principle problems of the jet-ventilation with free-jet and injector-ventilation with jet-pump-effect are discussed, and theoretical aspects of the own method are presented.
1989: Zeitschrift Für Erkrankungen der Atmungsorgane
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