Influence of indwelling position and vascular wall pressure distribution on the sticking phenomenon of the vascular access catheter

2020 ◽  
Vol 2020.31 (0) ◽  
pp. 2C14
Author(s):  
Ayano KIKUCHI ◽  
Maki SAITO ◽  
Shunichi KOBAYASHI
Keyword(s):  
Pressure Distribution ◽  
Vascular Access ◽  
Vascular Wall ◽  
Wall Pressure

scholarly journals Experimental Research of Wall Pressure Distribution and Effect of Micro Jet at Mach 1.5

2019 ◽  
Vol 8 (2S3) ◽  
pp. 1000-1003 ◽  
Keyword(s):  
Adverse Effect ◽  
Flow Field ◽  
Pressure Distribution ◽  
Area Ratio ◽  
Wall Pressure ◽  
Rapid Expansion ◽  
Base Region ◽  
Active Controls ◽  
Circle Diameter

In this paper, a study on the effect of the control on the wall pressure as well as the quality of the flow when tiny jets were employed. The small jet aimed to regulate the base pressure at the base region of the suddenly expanded duct and wall pressure distribution is carried out experimentally. The convergent-divergent (CD) nozzle with a suddenly expanded duct was designed to observe the wall pressure distribution with and without control using small jets. In order to obtain the results with the effect of controlled four tiny jets of 1 mm diameter located at a ninety-degree interval along a pitch circle diameter (PCD) of 1.3 times the CD nozzle exit diameter in the base, region was employed as active controls. The Mach numbers of the rapidly expanded are 1.5. The jets were expanded quickly into an axis-symmetry duct with an area ratio of 4.84. The length-todiameter (L/D) ratio of the rapid expansion duct was diverse from 10 to 1. There is no adverse effect due to the presence of the tiny jets on the flow field as well as the quality of the flow in the duct

Study of Semi-Inverse Problem for the Design of Annular S-Shaped Compressor Transition Duct

2015 ◽  
Author(s):  
Peng Shan ◽  
Jingyuan Wang ◽  
Zhentao Lv
Keyword(s):  
Inverse Problem ◽  
Pressure Distribution ◽  
Static Pressure ◽  
Pressure Coefficient ◽  
Optimal Solution ◽  
Outer Wall ◽  
Wall Pressure ◽  
Design Parameters ◽  
Gradient Distribution ◽  
Static Pressure Distribution

A new aerodynamic design strategy of the S-shaped transition duct between two compressor components was studied. Based on the controlled wall pressure gradient distribution and the wall velocity distribution, a semi-inverse problem of the transition duct was proposed, the corresponding inverse and direct approach codes were developed. To verify the feasibility of this method, two axial-centrifugal compressor transition ducts were designed. The results show that the static pressure distribution on the inner wall and the duct geometry both can be controlled freely by adjusting the inverse design parameters. The designed inner wall pressure distribution can be realized through a numerical matching procedure of the outer wall geometry based on the direct problem. The new design method is practicable that, without searching the optimal solution of the static pressure distribution of the inner wall, the total pressure coefficient can be at least 0.92.

scholarly journals A Case of Brachial Artery Thrombosis Caused by Massage of an Occluded Arteriovenous Graft

2021 ◽  
Vol 1 (1) ◽  
pp. 74-78
Author(s):  
Taisuke Matsue ◽  
Yoshikazu Kuroki ◽  
Toshihide Naganuma ◽  
Yoshiaki Takemoto ◽  
Junji Uchida
Keyword(s):  
Vascular Access ◽  
Brachial Artery ◽  
Surgical Intervention ◽  
Treatment Options ◽  
Limb Ischemia ◽  
Vascular Wall ◽  
Arteriovenous Graft ◽  
Case Presentation ◽  
Artery Thrombosis ◽  
Appropriate Treatment

Background: Acute upper limb ischemia (AULI) is a potential complication associated with massages of occluded vascular accesses in patients undergoing hemodialysis. Pharmacological thrombolysis, endovascular intervention and surgical intervention are possible treatment options. Deciding the appropriate treatment strategy is still a controversial issue. Case Presentation: The patient was a 43-year-old woman with renal failure who underwent hemodialysis and peritoneal dialysis. She was found to have an arteriovenous graft (AVG) thrombosis at the start of a hemodialysis session. She underwent massage of the vascular access, and immediately after the massage, she reported pain and cyanosis in her right-hand fingers and was referred to our hospital. Duplex ultrasonography revealed a large number of thrombi in the brachial, radial and ulnar arteries. AULI due to brachial artery thrombosis was diagnosed and surgical intervention was performed on the same day. The vascular wall of the forearm artery was incised vertically against the running vessel and thrombi around the bifurcation of the radial and ulnar arteries were removed. Angiography guided-surgical intervention was performed and improvement in blood flow was achieved. The patient was discharged on the second day after the operation. Conclusion: Surgical intervention has been reported as an effective treatment of AULI due to brachial artery thrombosis after massage of an occluded vascular access.

Influence of Shock Impingement on Wall Pressure Distribution within a Transpiration Cooled Scramjet

2022 ◽  
Author(s):  
Patrick Cragg ◽  
Friedolin T. Strauss ◽  
Stephan General ◽  
Stefan Schlechtriem
Keyword(s):  
Pressure Distribution ◽  
Wall Pressure ◽  
Shock Impingement
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