scholarly journals Pulsatile Lavage Systems with High Impact Pressure and High Flow Produce Cleaner Cancellous Bone Prior to Cementation in Cemented Arthroplasty

2021 ◽  
Vol 11 (1) ◽  
pp. 88
Author(s):  
Kevin Knappe ◽  
Rudi G. Bitsch ◽  
Mareike Schonhoff ◽  
Tilman Walker ◽  
Tobias Renkawitz ◽  
...  
Keyword(s):  
High Pressure ◽  
Cancellous Bone ◽  
Flow Rate ◽  
Joint Arthroplasty ◽  
High Impact ◽  
High Flow ◽  
Impact Pressure ◽  
Physical Parameters ◽  
Human Cancellous Bone ◽  
Pulsatile Lavage

In cemented joint arthroplasty, state-of-the-art cementing techniques include high-pressure pulsatile saline lavage prior to cementation. Even with its outstanding importance in cementation, there are surprisingly few studies regarding the physical parameters that define pulsatile lavage systems. To investigate the parameters of impact pressure, flow rate, frequency and the cleaning effect in cancellous bone, we established a standardized laboratory model. Standardized fat-filled carbon foam specimens representing human cancellous bone were cleaned with three different high-pressure pulsatile lavage systems. Via CT scans before and after cleaning, the cleaning effect was evaluated. All systems showed a cleaning depth of at least 3.0 mm and therefore can be generally recommended to clean cancellous bone in cemented joint arthroplasty. When comparing the three lavage systems, the study showed significant differences regarding cleaning depths and volume, with one system being superior to its peer systems. Regarding the physical parameters, high impact pressure in combination with high flow rate and longer distance to the flushed object seems to be the best combination to improve the cleaning of cancellous bone and therefore increase the chances of a deeper cement penetration that is required in cemented joint arthroplasty. In summary, this study provides the first standardized comparison of different lavage systems and thus gives initial guidance on how to optimally prepare cancellous bone for cemented joint arthroplasty.

scholarly journals 0311 Study on Internal Flow of High Pressure-High Flow Rate Small-sized Cooling Fan

2012 ◽  
Vol 2012 (0) ◽  
pp. 147-148
Author(s):  
Takuya AGAWA ◽  
Junichiro FUKUTOMI ◽  
Toru SHIGEMITSU
Keyword(s):  
High Pressure ◽  
Flow Rate ◽  
Internal Flow ◽  
High Flow ◽  
High Flow Rate ◽  
Cooling Fan

G050035 Development of Flow Meter Calibration Facility at High-Pressure and High-Flow-Rate for Hydrogen Station

2012 ◽  
Vol 2012 (0) ◽  
pp. _G050035-1-_G050035-3
Author(s):  
Toshihiro MORIOKA ◽  
Masaru ITO ◽  
Shizuichi FUJIKAWA ◽  
Masahiro ISHIBASHI
Keyword(s):  
High Pressure ◽  
Flow Rate ◽  
High Flow ◽  
High Flow Rate ◽  
Flow Meter ◽  
Calibration Facility ◽  
Hydrogen Station

CFD Analysis of Performance of Five-Stage High-Pressure Volute Pump

2016 ◽  
Author(s):  
Takayuki Suzuki ◽  
Takashi Takemura
Keyword(s):  
High Pressure ◽  
Flow Rate ◽  
Measurement Data ◽  
High Flow ◽  
High Flow Rate ◽  
Low Flow ◽  
Model Computation ◽  
Pump Performance ◽  
Computation Efficiency ◽  
Low Flow Rate

It is important in development of turbomachinery to predict their performance precisely. Especially the prediction of multistage pump performance is one of the challenging problems because internal phenomena which relate to the performance are complicated. Therefore, in this research, we verified accuracy of Computational Fluid Dynamics (CFD) in predicting performance of a five-stage high-pressure volute pump by comparing predicted values by CFD with measurement data. We tried two methods to predict the pump performance. One is a computation with a complete pump model which includes all five stages and leakage passages. This method can be expected to represent total internal flow phenomena. The other method is totaling up the performance data from separate computations of 1st–2nd stages and series stages. This method is simpler than the former and involves less computational cost. As a result, it was clarified that all the methods could predict pump head at the best efficiency point to some extent, even by steady computation. However, no prediction can predict positive gradient in Q-H curve which was observed in measurement at low flow rate. Except for the unsteady complete pump model computation, efficiency and shaft power could not be predicted precisely. In addition, at high flow rate, unsteady computation of the complete pump model shows the best agreement in head. In the complete pump model computation at high flow rate, the series stage next to the long crossover has larger head because of the influence of it. Therefore, the separated model has difficulty in representing series stages’ performance. In order to predict performance at high flow rate, unsteady computations also including properly the influence of the long crossover properly are necessary. In addition, to predict performance at low flow rate, unsteady computation is necessary.

scholarly journals Does Pressurized Carbon Dioxide Lavage Improve Bone Cleaning in Cemented Arthroplasty?

2021 ◽  
Vol 11 (13) ◽  
pp. 6103
Author(s):  
Kevin Knappe ◽  
Christian Stadler ◽  
Moritz Innmann ◽  
Mareike Schonhoff ◽  
Tobias Gotterbarm ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Cancellous Bone ◽  
Carbon Foam ◽  
Impact Pressure ◽  
Long Term Results ◽  
Implant Fixation ◽  
Human Cancellous Bone ◽  
Cemented Arthroplasty ◽  
The Impact ◽  
Saline Lavage

Cemented implant fixation in total joint arthroplasty has been proven to be safe and reliable with good long-term results. However, aseptic loosening is one of the main reasons for revision, potentially caused by poor cementation with low penetration depth in the cancellous bone. Aim of this prospective laboratory study was, to compare impact pressure and cleaning effects of pulsatile saline lavage to novel carbon dioxide lavage in a standardized carbon foam setup, to determine whether or not additional use of carbon dioxide lavage has any impact on cleaning volume or cleaning depth in cancellous bone. Carbon specimens simulating human cancellous bone were filled with industrial grease and then underwent a standardized cleaning procedure. Specimens underwent computed tomography pre- and post-cleaning. Regarding the impact pressure, isolated carbon dioxide lavage showed significant lower pressure compared to pulsatile saline lavage. Even though the combination of carbon dioxide lavage and pulsatile saline lavage had a positive cleaning effect compared to the isolated use of pulsatile saline lavage or carbon dioxide lavage, this was not significant in terms of cleaning volume or cleaning depth.

High-Pressure, High-Flow-Rate Stimulation Equipment for Shale Fracture Treatments

2019 ◽  
Author(s):  
Jim B. Surjaatmadja ◽  
Tom Logan ◽  
Timothy H. Hunter ◽  
Stanley V. Stephenson ◽  
Brad Bull ◽  
...  
Keyword(s):  
High Pressure ◽  
Flow Rate ◽  
High Flow ◽  
High Flow Rate ◽  
Shale Fracture

scholarly journals Research on Velocity Fluctuation of High Pressure and High Flow Double Booster Cylinder Hydraulic System

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Fuqiang Chen ◽  
Rendong Wu ◽  
Chaolong Yuan ◽  
Wei Wei ◽  
Wei Jiao
Keyword(s):  
High Pressure ◽  
Analytical Solution ◽  
Flow Rate ◽  
Velocity Fluctuation ◽  
Hydraulic System ◽  
Control Method ◽  
Hydraulic Cylinder ◽  
High Flow ◽  
Switching Process ◽  
The Stability

In the extrusion machine with double booster cylinder hydraulic system, the stability of the extrusion velocity is affected because of the switching process of the two booster cylinders in the hydraulic system. In this paper, the analytical solution of the extrusion velocity fluctuation caused by the double booster cylinder hydraulic system is derived. Firstly, the model of the double booster cylinder hydraulic system was established, and the switching process of the two booster cylinders was studied under the condition of high pressure and high flow. Secondly, the traditional control method cannot obtain stable extrusion velocity under the condition of high pressure and high flow rate, and the new control method was proposed to significantly reduce the fluctuation of extrusion velocity. Thirdly, the fluctuation of extrusion velocity caused by the booster system was derived and the influence of the parameters of the hydraulic components such as the hydraulic cylinder and the hydraulic valve and the working conditions such as the flow rate and the pressure on the fluctuation of extrusion velocity was analyzed. Finally, based on the AMESIM software, the double booster cylinder hydraulic system of the 35 MN extrusion machine was simulated and analyzed. The numerical simulation results were used to verify the analytical solution of extrusion velocity fluctuation. The analytical solution can be applied to the engineering design of the hydraulic system and more in-depth optimization analysis.

Design of the Cascaded Open-Channel Direct Current Electroosmotic Pump

2011 ◽  
Vol 483 ◽  
pp. 259-263 ◽  
Author(s):  
Ting Ting Liu ◽  
Zhu Chuan Bai ◽  
Yang Gao
Keyword(s):  
High Pressure ◽  
Flow Rate ◽  
Direct Current ◽  
Open Channel ◽  
Cooling System ◽  
Test System ◽  
High Flow ◽  
High Flow Rate ◽  
Driving Voltage ◽  
Electroosmotic Pump

Electroosmotic pump does not need moving mechanical parts, which can be fabricated by micromachining process and integrated with other micro-devices. Electroosmotic pump is the hydraulic actuator component and can be used in HPLC (High Pressure Liquid Chromatography), μTAS (Micro totally analysis system), chip test system, micro cooling system and micro drug delivery system, etc. The paper is to design an electroosmotic pump with low driving voltage, high pressure and high flow rate, and fabricate the samples of cascaded open-channel direct current electroosmotic pump. The three-dimensional model of one-stage parallel open-channel electroosmotic pump is established by finite element analysis software of CoventorWare. The numerical simulation of the electroosmotic pump performance has been done by CoventorWare. Compared with the equivalent circuit model, the results show that the cascaded open-channel direct current electroosmotic pump has the advantages of high flow rate and high pressure.

High pressure, high flow rate batch mixing apparatus for high throughput experiments

2021 ◽  
Vol 92 (11) ◽  
pp. 114104
Author(s):  
Anandvinod Dalmiya ◽  
Jai M. Mehta ◽  
Robert S. Tranter ◽  
Patrick T. Lynch
Keyword(s):  
High Pressure ◽  
High Throughput ◽  
Flow Rate ◽  
High Flow ◽  
High Flow Rate ◽  
Batch Mixing ◽  
High Throughput Experiments
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