Seal Pressure Research Articles

Ethanol plasma-induced polymerization of carbon fiber surface for improving mechanical properties of carbon fiber-reinforced lightweight oil well cement

Carbon fiber (CF) pretreated with oxygen plasma and modified with ethanol plasma was employed to improve the mechanical properties of lightweight oil well cement (LOWC). Surface properties of the modified CF and mechanical properties and structures of the CF-reinforced LOWC (CFRLOWC) were investigated using contact angle tests, Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM) and mechanical-property tests. The modified CF surface showed a higher roughness than the raw CF. Further, the oxygen content was increased, and oxygen-containing functional groups were successfully grafted on the CF surface, which led to an improved wetting behavior. The flexural and tensile strengths of the ethanol plasma polymerization modified CFRLOWC significantly increased by 27.25% and 70.56% with respect to the raw CF reinforced sample. The triaxial stress-strain curve showed higher strain capacity. Further, the pressure loading and seal tests revealed improved bearing capacity and isolation ability. The critical value of the pressure under gas channeling increased from 44.8 MPa to 71.5 MPa. The ethanol plasma polymerization modified CF significantly improved the interfacial adhesion between CF and cement matrix, indicating it can improve the bearing capacity and integrity of CFRLOWC sheaths in oil and gas wells.

Analysis of reciprocating O‐ring seal in the pressure‐balanced oil‐filled wet‐mate electrical connectors for underwater applications

AbstractThe rapidly growing demand for wet‐mate electrical connectors in underwater projects has attracted the attention of researchers in the field. Sealing is the key to underwater connectors. In this paper, the reciprocating O‐ring seal during underwater operations of the pressure‐balanced connectors was studied. A numerical model containing the Reynolds equation, hyperelastic deformation, and asperity contact was used to describe mixed elastohydrodynamic lubrication (EHL) in the O‐ring seal. Results indicate that the friction force of the seal in the connector decreases directly with the increased sealed pressure, and its friction force is smaller than that in the conventionally hydraulic structure. As the sealed pressure increases, the minimum film thickness in the connector increases, which means a better lubrication in the deeper sea. The oil leakage in the connector increases with the sealed pressure, but the increase rate is smaller than that in the hydraulic structure. It proves that the design of pressure‐balanced structure can not only achieve wet‐mate operation at any depth but also facilitate its dynamic sealing performance.

Numerical Investigations on the Sealing Performance of a Reciprocating Seal Based on the Inverse Lubrication Method

The work presented in this paper describes a new approach to calculate the film profile, friction, and fluid transport of a reciprocating U-cup seal used in a hydraulic piston pump. An innovative partial lubrication model of the seal is developed, which connects the inverse hydrodynamic lubrication method and Greenwood–Williamson asperity contact model. Finite element models (FEM) were established to simulate deformation behavior under-mounted and pressurized process using finite element code ansys. Based on the finite element simulations, corresponding numerical calculations have been made using the matlab with the inverse hydrodynamic lubrication and asperity contact theories. The accuracy of these models was validated against existing experimental data to ensure that they can predict the sealing performance sufficiently. The effects of the operating parameters as well as the magnitude of interference on the sealing performance in terms of friction, fluid transport, and film thickness were discussed. The results of the simulation indicate that the interference fit, sealed pressure, and rod velocity play significant roles to improve the wear and seizure resistance capability that is critical to the service life of the seal.

Analysis and Treatment of Abnormal Pressure of Shaft Seal of Small Steam Turbine

In the commissioning of power plant, this paper finds that the shaft seal pressure of small steam turbine does not match the shaft seal pressure of steam turbine, and the shaft seal pressure of small steam turbine is high. On the basis of on-site verification and theoretical calculation, the problem of abnormal shaft seal pressure of small steam turbines was solved by modifying the steam turbine shaft sealing point access point and increasing the small turbine shaft seal overflow device, which provided a solution for similar problems in the future.

Long-Term Pathology of Ovine Lumbar Spine Degeneration Following Injury Via Percutaneous Minimally Invasive Partial Nucleotomy.

The focus of this work is to assess the long-term progression of degeneration in the ovine lumbar spine following a minimally invasive model injury comparable to the damage of an intervertebral disc (IVD) herniation. A partial nucleotomy was performed on 18 sheep via the percutaneous dorsolateral approach. The animals were culled at 6 and 12 months to evaluate the damaged and neighboring functional spine units (FSUs) for degenerative characteristics via μ-CT and histology. Both quantitative μ-CT and histology investigations demonstrated statistically significant differences between the native and damaged FSUs investigated. Qualitative analysis of μ-CT revealed numerous pathological markers consistent with intervertebral disc degeneration (IDD), with differences in frequency and severity between the native and damaged FSUs. The annulus fibrosus reforms a pressure seal within 6 weeks, but the extent of the trauma is significant enough to initiate IVD degeneration, which is already clearly visible at 6 months and especially so 12 months post-op. IDD pathology consistent with signs of a herniation was seen in both the 6- and 12-month groups. This technique provides a useful model injury for the preclinical evaluation of IDD in large animal models, especially in regards to simulating disc herniation as well as for testing the efficacy of associated therapies in the future. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:2376-2388, 2019.

Association of Mallampati scoring on airway outcomes in women undergoing general anesthesia with Supreme\u2122 laryngeal mask airway in cesarean section

BackgroundObstetric dfficult airway is a leading cause of maternal morbidity and mortality. The laryngeal mask airway (LMA) is often used as a rescue airway device after failed intubation, however, little is known about predictors of difficult LMA insertion, particularly in obstetrics. Since Mallampati scores of III/IV has been associated with difficult tracheal intubation, our present study aims to investigate if Mallampati score (MP) could predict airway outcomes for LMA use in obstetrics.MethodsThis prospective cohort study was performed at a single-center: Quanzhou Women’s and Children’s Hospital, Fujian Province, China. Five hundred and eighty-four parturients undergoing elective cesarean section under general anesthesia were recruited. The primary outcome was time to effective ventilation, and secondary outcomes included first attempt insertion success, seal pressure, ventilation and hemodynamic parameters, occurrence of clinical aspiration, and maternal and fetal outcomes.ResultsThe parturients were classified into two groups based on MP of III/IV (High MP: 61) versus I/II (Low MP: 523). BMI was higher in the High MP group than in the Low MP group (mean (SD) 29.3 (7.0) vs 26.8 (3.1), p < 0.0001). There was no difference in maternal age, ASA status and gestational age. There was similar time to effective ventilation (mean (SD) High MP: 14.9 (4.5) vs Low MP: 15.7 (4.4) seconds, p = 0.2172), and first attempt success rate, seal pressure, and peak airway pressure. No clinical aspiration was noted. The incidence of blood on SLMA was higher in the High MP group than in Low MP (4 (6.6%) vs 4 (0.8%), p = 0.001). There was no difference in sore throat, voice hoarseness, maternal satisfaction and fetal outcomes.ConclusionHigh MP was not associated with reduced SLMA airway outcomes in cesarean section under general anesthesia, but may increase the risk of blood found on SLMA upon removal.Trial registrationThis study was registered at http://www.clinicaltrials.gov, identifier: NCT02026882, retrospectively registered. Date of registration: December 31, 2013.

Comparison of Supreme laryngeal mask airway versus endotracheal intubation for airway management during general anesthesia for cesarean section: a randomized controlled trial

BackgroundThe obstetric airway is a significant cause of maternal morbidity and mortality. Endotracheal intubation is considered the standard of care but the laryngeal mask airway (LMA) has gained acceptance as a rescue airway and has been incorporated into the obstetric airway management guidelines. In this randomized controlled equivalence trial, we compared the Supreme LMA (SLMA) with endotracheal intubation (ETT) in managing the obstetric airway during cesarean section.MethodsParturients who underwent elective cesarean section under general anesthesia were randomized to receive either an SLMA or ETT as their airway device. Our primary outcome was first-attempt insertion success. Successful insertion was defined as adequate bilateral air entry with auscultation and the presence of end-tidal carbon dioxide on the capnogram. The first-attempt insertion success rate was compared using the Chi-Square test. Secondary outcomes included time-to-ventilation, seal pressure, ventilation/hemodynamic parameters, occurrence of clinical aspiration, fetal outcomes, and maternal side effects associated with the airway device.ResultsWe recruited 920 parturients (460 SLMA, 460 ETT) who underwent elective cesarean section under general anesthesia. Patient characteristics were similar between the groups. First attempt success was similar (Odds Ratio--ORSLMA/ETT: 1.00 (95%CI: 0.25, 4.02), p = 1.0000). SLMA was associated with reduced time to effective ventilation (Mean Difference--MD -22.96; 95%CI: − 23.71, − 22.21 s) compared to ETT group (p < 0.0001). Ventilation parameters, maternal and fetal outcomes were similar between the groups, and there was no aspiration.ConclusionsSLMA could be an alternative airway management technique for a carefully selected low-risk obstetric population, with similar insertion success rates, reduced time to ventilation and less hemodynamic changes compared with ETT. Our findings are consistent with the airway guidelines in recommending the second-line use of LMA in the management of the obstetric airway.Trial registrationThe study was registered at http://www.clinicaltrials.gov, identifier: NCT01858467, retrospectively registered. Date of registration: May 21, 2013.

Experimental Validation and Numerical Simulation of Static Pressure in Multi-Stage Ferrofluid Seals

With the development of science technology, ferrofluid seal has been intensively applied in mechanical industry, but more and more larger sealing stages are needed. At present, the literature mostly concentrated on numerical analysis with few pole pieces ferrofluid seals and focused on the critical pressure value in one-stage magnetic fluid seal, lacking of numerical simulation and experimental validation on the static pressure of multi-stage ferrofluid seals. On this basis, the analysis of larger number of sealing stages is presented. And numerical simulation along with experiment investigation was used to study the seal capacity of ferrofluids in different seal gaps and different seal stages in this paper. The results show that the theoretical value is well coincident with experimental value when the sealing gap is less than 0.2 mm. Increase the number of the pole tooth can significantly improve the seal capacity of ferrofluid seal, but the sealing pressure of ferrofluids does not increase linearly with the addition of the number of pole teeth. For the new structure, the pressure of one-stage pole tooth has more than doubled as the sealing clearance is 0.2 mm and 3.5 times increase when the sealing gap is 0.3 mm.

Experimental Verification on Friction Factor Fractal Model of the End Faces for Mechanical Seals

In order to verify the correction of the friction factor fractal model of the end faces for mechanical seals, some tests for mechanical seal were conducted on the self-designed mechanical seal testing device. Experimental sealed medium was 15°C water. A series of experimental data of friction factor were obtained under different spring pressures and sealed fluid pressures as well as at various rotating speeds. Compared the theoretical calculation data with those of experimental, the results show that the friction factor variation of theoretical was the same as those of experimental with the change of the working parameters, the relative error decreased with the increase of rotating speed and sealed fluid pressure, and the maximum relative error was less than 5.5% when the rotating speed reached the normal working speed of 2900 rpm.

High pressure seal failure: Analysis of the fatigue issue originated in pressure-leak relieving slots

This study was focused on a metallic part from a dynamic seal of an ultra-high pressure intensifier. This part developed cracks originated at pressure relieving slots. Cracks were analyzed to get information about their origin and propagation mechanisms Simulations were performed to derive stress and strain state near the initiation region. It was concluded that cracks were initiated and propagated under mode II loading. Therefore, a model has been proposed to relate the tribological properties of the material and the crack plane orientation. Finally, a new slot was designed to delay crack initiation at this part.

Nasal positive pressure with the SuperNO2VA™ device decreases sedation-related hypoxemia during pre-bariatric surgery EGD.

Pre-operative esophagogastroduodenoscopy (EGD) is becoming routine practice in patients undergoing bariatric surgery. Many patients with morbid obesity have obstructive sleep apnea (OSA), which can worsen hypoxia during an EGD. In this study, we report our outcomes using the SuperNO2VA™ device, a sealed nasal positive airway pressure mask designed to deliver high-fraction inhaled oxygen and titratable positive pressure compared to conventional nasal cannula. Between June 2016 and August 2017, we conducted a prospective observational study that included 56 consecutive patients who presented for EGD prior to bariatric surgery. Airway management was done using either the SuperNO2VA™ (N = 26) device or conventional nasal cannula (N = 30). Patient demographics, procedure details, and outcomes were compared between the two groups. The SuperNO2VA™ group had a lower median age compared to the control group (38.5 vs. 48.5 years, p = 0.04). These patients had a higher body mass index (BMI) (47.4 vs. 40.5, IQR, p < 0.0001), higher ASA class (p = 0.03), and were more likely to have OSA (53.9% vs. 26.7%, p = 0.04). Desaturation events were significantly lower in the SuperNO2VA™ group (11.5% vs. 46.7%, p = 0.004) and the median lowest oxygen saturation was higher in the SuperNO2VA™ group (100% vs. 90.5%, p < 0.0001). This is the first study to report on the use of the SuperNO2VA™ device in bariatric patients undergoing pre-operative screening EGD. The use of the SuperNO2VA™ device offers a clinical advantage compared to the current standard of care. Our data demonstrate that patients with higher BMI, higher ASA classification, and OSA were more likely to have the SuperNO2VA™ device used; yet, paradoxically, these patients were less likely to have issues with desaturation events. Use of this device can optimize care in this challenging patient population by minimizing the risks of hypoventilation.

Comparison of analysis methods for wind-driven cross ventilation through large openings

Simplified engineering models are essential to design and control natural ventilation, yet there are not many theories that can predict cross ventilation with reasonable accuracy. Models based on the orifice equation are known to be inadequate for large openings, but there is no precise definition of the large opening. In this paper, we show that it is not just the opening size but also the wind angles that affect the prediction accuracy of the orifice based equations. The mass flow rate predicted by CFD simulations is within 10% of the flow rate predicted by the orifice equations with sealed body pressure coefficients as long as the total pressure drop in the presence of openings is nearly equal to the static pressure drop in cases with no openings. The total pressure drop in the presence of openings when the openings are aligned to the wind, i.e. when wind can pass directly through two openings, is smaller than the static pressure drop in cases with no openings. If the wind is angled, and the entering wind cannot pass undisturbed through the outlet because of the building walls, the total pressure drop will not be much smaller than the static pressure drop of the sealed building. In this condition, the orifice equation can still be used, even for porosities of up to 50%. However, when the wind can pass undisturbed between two opposite openings, the orifice based equations are not adequate, even for a porosity as small as 6%.

Rearing and breeding of germ-free mice for over 1 year in a sealed positive pressure cage system

Rearing and breeding of germ-free mice for over 1 year in a sealed positive pressure cage system

Simulation Calculation of Temperature of the End Face for Mechanical Seals Based on Fractal Theory

In order to study the effects of operating parameters and surface topography on temperature of the end faces for mechanical seals, an average temperature calculation model of end faces for mechanical seals was established based on the contact fractal model and the friction factor fractal model, adopting fractal parameters to characterize surface topography, and simplifying the seal ring as equal cross-sectional equivalent cylinder. Influencing factors of average temperature were analyzed by simulation calculation for friction pair faces matched by cemented carbide YG8-carbon graphite M106K of partial balance mechanical seal. Theoretical calculation results show that the average temperature of seal face increased linearly with the increase of spring pressure or sealed fluid pressure, and increased approximately linearly with the increase of rotating speed. The average temperature increased with the increase of fractal dimension and with the decrease of characteristic length scale of the soft ring. The change of average temperature was smaller when the fractal dimension was smaller and the characteristic length scale was larger, while the average temperature increased rapidly when the fractal dimension was larger and the characteristic length scale was smaller.

Experimental Study of the Leakage and Rotordynamic Coefficients of a Long-Smooth Seal With Two-Phase, Mainly Oil Mixtures

This paper experimentally studies the leakage and rotordynamic performance of a long-smooth seal with air–oil mixtures. Tests are performed with inlet gas-volume-fraction gas volume fraction (GVF) = 0%, 2%, 4%, 6%, and 10%, rotor speed ω = 5, 7.5, 10, and 15 krpm, inlet temperature Ti = 39.4 °C, exit pressure Pe = 6.9 bars, and pressure drop (PD) = 31, 37.9, and 48.3 bars. Test results show that adding air into the oil flow does not change the seal's mass flow leakage m˙ discernibly but significantly impacts the seal's rotordynamic characteristics. For all PDs and speeds, K increases as inlet GVF increases from zero to 10% except for 6% ≤ inlet GVF ≤ 10% when PD = 48.3 bars, where K decreases as inlet GVF increases. The K increment will increase a pump rotor's natural frequency and critical speed. Increasing the rotor's natural frequency would also increase the onset speed of instability (OSI) and improve the stability of the rotor. Adding air into the oil flow has little impact on cross-coupled stiffness k, direct damping C, and effective damping Ceff. Ceff = C − k/ω + mqω, where mq is the cross-coupled virtual-mass. Test results are compared to predictions from San Andrés's (San Andrés, 2011, “Rotordynamic Force Coefficients of Bubbly Mixture Annular Pressure Seals,” ASME J. Eng. Gas Turbines Power, 134(2), p. 022503.) bulk-flow model, which assumes that the liquid–gas mixture is isothermal and homogenous. The model reasonably predicts m˙, C, and Ceff. All predicted K values are positive, while measured K values are negative for some test cases. Predicted k values are close to measurements when ω = 5 krpm and are larger than measurements when 7.5 ≤ ω ≤ 15 krpm.

Conditions for laryngeal mask airway placement in terms of oropharyngeal leak pressure: a comparison between blind insertion and laryngoscope-guided insertion

BackgroundInsertion under laryngoscopic guidance has been used to achieve ideal positioning of the laryngeal mask airway (LMA). However, to date, the efficacy of this technique has been evaluated only using fiberoptic evaluation, and the results have been conflicting. Other reliable tests to evaluate the efficacy of this technique have not been established. Recently, it has been suggested that the accuracy of LMA placement can be determined by clinical signs such as oropharyngeal leak pressure (OPLP). The aim of this study was to assess the efficacy of LMA insertion under laryngoscopic guidance using OPLP as an indicator.MethodsAfter approved by the institutional ethics committee, a prospective comparison of 100 patients divided into 2 groups (50 with blind technique and 50 with the laryngoscope technique) were evaluated. An LMA (LarySeal™, Flexicare medical Ltd., UK) was inserted using the blind approach in the blind insertion group and using laryngoscopy in the laryngoscope-guided insertion group. The OPLP, fiberoptic position score, whether the first attempt at LMA insertion was successful, time taken for insertion, ease of LMA insertion, and adverse airway events were recorded.ResultsData were presented as mean ± standard deviation. The OPLP was higher in the laryngoscope-guided insertion group than in the blind insertion group (21.4 ± 8.6 cmH2O vs. 18.1 ± 6.1 cmH2O, p = 0.031). The fiberoptic position score, rate of success in the first attempt, ease of insertion, and pharyngolaryngeal adverse events were similar between both groups. The time taken for insertion of the LMA was significantly longer in the laryngoscope-guided insertion group, compared to blind insertion group (35.9 ± 9.5 s vs. 28.7 ± 9.5 s, p < 0.0001).ConclusionLaryngoscope-guided insertion of LMA improves the airway seal pressure compared to blind insertion. Our result suggests that it may be a useful technique for LMA insertion.Trial registrationcris.nih.go.kr, identifier: KCT0001945 (2016-06-17).

A comparison between ProSeal laryngeal mask airway and Air-Q Blocker in patients undergoing elective laparoscopic cholecystectomy.

Background and Aims:ProSeal laryngeal mask airway (PLMA) is an established device for airway management, while Air-Q Blocker (AQB) is a relatively new supraglottic device. The aim of this study is to compare AQB against PLMA in adults undergoing laparoscopic cholecystectomy under general anesthesia.Material and Methods:Eighty-eight adult patients scheduled for laparoscopic cholecystectomy under general anesthesia were randomly allocated into two groups. A drain tube (gastric tube for PLMA and blocker tube for AQB) was inserted through the drain channel of the respective device. PLMA was inserted in Group P (n = 44) and AQB was inserted in Group A (n = 44) to secure the airway. The primary endpoint was airway seal pressure. Secondarily, we sought to compare overall insertion success, ease of insertion, hemodynamic effects after initial placement, ease of drain tube placement, and perioperative oropharyngolaryngeal morbidity between the devices.Results:Oropharyngeal seal pressures for AQB and PLMA were 31.5 ± 2.41 and 29.41 ± 2.14 cm H2O, respectively (P = 0.01). Insertion time was longer with AQB than PLMA, 25.59 ± 5.71 and 18.66 ± 3.15 seconds, respectively (P = 0.001). Ease and success rate of insertion was better with PLMA compared to AQB. Failure of device insertion was seen in 2 cases of Group A. Gastric distension was seen in 4 patients in Group A, requiring replacement with endotracheal tube in two patients. Ventilation was successful in all 44 patients with PLMA. Both the devices were comparable in providing a patent airway and adequate oxygenation during controlled ventilation. There was an increased trend of airway trauma and complications in the AQB group.Conclusion:Both PLMA and AQB show similar efficacy in maintaining ventilation and oxygenation, during laparoscopic surgery. However, proper positioning and functioning of the blocker tube of AQB is a limiting factor, and needs further evaluation.

Supraglottic airway devices in short gynecological procedures: A randomized, clinical study comparing the Baska® mask and I-Gel® device.

Background:Supraglottic airway devices are used for anesthesia in elective surgical procedures circumventing the need for intubation. We investigated the efficacy and safety of Baska® mask in comparison to an I-Gel® device.Methods:In this cross-sectional, observational study, we randomized 100 female patients (age 18–45 years, American Society of Anaesthesiologists grade I or II) undergoing elective short gynecological procedures into two groups, to receive ventilation with either Baska mask® (group 1, n = 50) or an I-Gel® device (group 2, n = 50). We excluded patients with obesity, short neck, and known systemic and upper airway disorders. The primary outcome was the oropharyngeal airway seal pressure, and the secondary outcomes were the ease of insertion and the complication rate. The results were analyzed using Mann–Whitney U-test and Fisher's exact test, and correlation analysis was done by Spearman's correlation test.Results:A total of 56 patients underwent dilatation and curettage, whereas the remaining had hysteroscopy in the study. The airway seal pressure achieved was higher with Baska® mask than I-Gel® device (35.8 ± 10.3 and 26.9 ± 7.5 of cm H2O, respectively; P < 0.0001). The ease of insertion (P < 0.0001) was better in group 1 and the complication rates were similar in both the groups (P > 0.05).Conclusion:Baska® mask offers a superior airway seal pressure with minimum complications in comparison to an I-Gel® device. Further studies with a large number of patients in different surgical settings are required to confirm our findings.

Comparative evaluation of air-Q and classic laryngeal mask airway for surgeries under anesthesia: A randomized open-label trial

Objective: Classic laryngeal mask airway (cLMA) is a prototype supraglottic airway device, and Air-Q is a newly introduced device for use as a primary airway and as an aid for intubation. Due to paucity of literature comparing Air-Q with cLMA, this prospective, randomized, single-blinded study was performed, to evaluate their clinical performance as a primary airway conduit. Methods: Sixty patients of either sex with the American society of anesthesiology Grade I or II, weighing between 50 and 70 kg, were randomly allocated to either the cLMA (n = 30) or Air-Q (n = 30) group. After induction of anesthesia, the assigned airway device was introduced. The ease of insertion, vital parameters, oropharyngeal seal pressure (OSP), airway morbidity, and fiberoptic grades of laryngeal view was recorded. Results: There was no significant difference in ease of insertion, the time taken for successful device placement, number of attempts, or postoperative morbidities. Air-Q was found better with respect to hemodynamic stability during placement of the device. There was a significant difference in the OSP between the Air-Q (22.12 ± 1.740 cm H2O) and cLMA (16.28 ± 2.052 cm H2O), P Conclusion: Air-Q was found to be superior to cLMA for controlled ventilation in view of better OSP and a superior fiberoptic laryngeal view.

Comparison of success rate of BlockBuster® versus Fastrach® LMA as conduit for blind endotracheal intubation: A prospective randomised trial.

Background and Aims:BlockBuster® Laryngeal Mask Airway, a newer supraglottic airway device, is claimed to be an efficient conduit for endotracheal intubation. Intubating laryngeal mask airway (LMA) is an established device for the same. This randomised study was undertaken to evaluate the success rate of blind intubation using either of these LMAs.Methods:Sixty patients of age group 20-60 years undergoing general anaesthesia were randomised in 2 groups, of 30 patients each, for tracheal intubation using either BlockBuster® LMA (Group B) or the Intubating LMA Fastrach® (Group F). After induction of anaesthesia, LMAs were inserted and on achieving adequate ventilation with the device, fibreoptic scopy was performed to assess the glottis visualisation score. Blind intubation was attempted through the supraglottic airway devices (SAD). The primary objective was first pass successful intubation and secondary outcomes were ease, time for LMA insertion, oropharyngeal seal pressure (OSP), LMA removal time, fibreoptic scoring and complications. Data was analysed using SPSS V22 software.Results:The first-attempt success rate of tracheal intubation was 90% in Group B and 66.6% in Group F (P = 0.028), while the overall success rate of intubation was 96.6% in Group B and 89.9% in Group F (P = 0.3). The OSP in Group B was 33.7 ± 1.8 and 22.7 ± 1.5 cm H2O in Group F (P = 0.001). Complications such as sore throat and blood stain were reduced with BlockBuster® LMA.Conclusion:BlockBuster® LMA provides higher first pass success rate of blind tracheal intubation with less complications like sore throat and blood staining.