Evaluation of BD Vacutainer Eclipse and BD Vacutainer Ultra-Touch butterfly blood collecting sets in laboratory testing

Objectives Choosing the right device for blood collection is an issue that is frequently encountered in laboratory medicine. The purpose of this study was to compare the quality of the samples collected in terms of hemolysis index, pain intensity and tube filling rates of the samples drawn with BD Vacutainer® EclipseNeedle and BD Vacutainer Ultra-Touch™ Butterfly Blood Collection Set, which is currently used in laboratories. Methods Blood samples were drawn from the 44 apparently healthy adult individuals from different arm sites by routine phlebotomy into Citrate, SST and EDTA tubes in Karapınar State Hospital. K, P, AST, LDH tests and hemolysis index were analyzed by Mindray BS-800 chemistry analyzer. Complete blood count (CBC) was determined by Mindray BC 6000. Results There was no significant difference in K, P, AST, LDH and CBC values between the devices for hemolysis (p>0.05). No significant difference was found out with respect to visual hemolysis and hemolysis index, tube filling speed and pain intensity between the devices. Conclusions Our findings demonstrate that two sets may used for venipuncture blood collection without creating additional hemolysis risk.

Self-oscillatory flow in the Hartmann resonator – Numerical simulation

Self-oscillatory flow in the Hartmann resonator is numerically calculated within the framework of ideal (inviscid and non-heat-conducting) gasdynamics. The calculations are performed for the case of a sonic jet impinging on a tube varying from that with a sealed inlet (rod) to a fairly deep cavity. The spacing between the tube and the nozzle and the nozzle pressure ratio are also varied in the calculations. On the basis of the calculated results the oscillation process is described in detail and its mechanism is revealed for both shallow and deep tubes. For shallow tubes and a rod it is due to an imbalance in the flow rate and momentum between two regions in the jet that impinges on the obstacle. For deep tubes the oscillations are due to the tube filling and evacuation somewhat reminiscent of the process occurring in a one-quarter-wave resonator. In any case no signature of a feedback loop in the external acoustic field of the jet was detected. The results of the calculations are in good agreement with experimental data. The effects of mounting a lip on the tube (transition from a low- to high-frequency operation mode) and heating in the Hartmann tube are also discussed.

Study and Analysis of ENCON Opportunities in Automatic Tube Filling Machine

In this paperentitled, “Study and analysis of ENCON opportunities in Automatic Tube Filling Machine,” In this machine the plastic tubes gets sealed and aluminum tubes gets folded at open end. Wehave plannedto study and design mechanical cam based folding operation which will reduce the operating cost of the machine. We are going to study the folding operation in traditional Automatic tube filling machine. The traditional Automatic tube filling machine has pneumatically operated folding mechanism due to which operating cost of the machine increases. Using mechanical energy and cam principle we can operate the tube folding mechanism[4]. Simple modification in design will operates the tube folding mechanism without changing the main motor consumption.

Enhancement by Metallic Tube Filling of the Mechanical Properties of Electromagnetic Wave Absorbent Polymethacrylimide Foam

By the addition of a carbon-based electromagnetic absorbing agent during the foaming process, a novel electromagnetic absorbent polymethacrylimide (PMI) foam was obtained. The proposed foam exhibits excellent electromagnetic wave-absorbing properties, with absorptivity exceeding 85% at a large frequency range of 4.9–18 GHz. However, its poor mechanical properties would limit its application in load-carrying structures. In the present study, a novel enhancement approach is proposed by inserting metallic tubes into pre-perforated holes of PMI foam blocks. The mechanical properties of the tube-enhanced PMI foams were studied experimentally under compressive loading conditions. The elastic modulus, compressive strength, energy absorption per unit volume, and energy absorption per unit mass were increased by 127.9%, 133.8%, 54.2%, and 46.4%, respectively, by the metallic tube filling, and the density increased only by 5.3%. The failure mechanism of the foams was also explored. We found that the weaker interfaces between the foam and the electromagnetic absorbing agent induced crack initiation and subsequent collapses, which destroyed the structural integrity. The excellent mechanical and electromagnetic absorbing properties make the novel structure much more competitive in electromagnetic wave stealth applications, while acting simultaneously as load-carrying structures.

Experimental Study on Reinforced Concrete Beam and Composite Column Joint with Square Steel Cage

For the optimum performance of the structural members, the joint of the beam and column has a significant role. This paper presents the behavior of encased steel column and reinforced concrete beam with an improved connection system. In this connection, the steel tube which interrupts the longitudinal reinforcement in the beam is made continuous in the joint zone. This is done by providing square steel cage inside the concrete casing at the joint. This system is easier for casting and tube filling when compared to the conventional method of in-situ welding and hole-drilling. Experiments were conducted on eight specimens with two specimens in each series which included four control specimens. Number of tiers and the number of concentric rings were the variables among the specimens. The specimens were tested under a constant axial load and reversed lateral loading. Experimental results indicate a significant increase in the lateral strength capacity and ductility ratio of the beam-column when the joint is provided with the square steel cage inside the concrete casing.