Pre-emptive active drainage of reflux (PARD) in Ivor-Lewis oesophagectomy with negative pressure and simultaneous enteral nutrition using a double-lumen open-pore film drain (dOFD)

Background Postoperative reflux can compromise anastomotic healing after Ivor-Lewis oesophagectomy (ILE). We report on Pre-emptive Active Reflux Drainage (PARD) using a new double-lumen open-pore film drain (dOFD) with negative pressure to protect the anastomosis. Methods To prepare a dOFD, the gastric channel of a triluminal tube (Freka®Trelumina, Fresenius) is coated with a double-layered open-pore film (Suprasorb®CNP drainage film, Lohmann & Rauscher) over 25 cm. The ventilation channel is blocked. The filmcoated segment is placed in the stomach and the intestinal feeding tube in the duodenum. Negative pressure is applied with an electronic vacuum pump (− 125 mmHg, continuous suction) to the gastric channel. Depending on the findings in the endoscopic control, PARD will either be continued or terminated. Results PARD was used in 24 patients with ILE and started intraoperatively. Healing was observed in all the anastomoses. The median duration of PARD was 8 days (range 4–21). In 10 of 24 patients (40%) there were issues with anastomotic healing which we defined as “at-risk anastomosis”. No additional endoscopic procedures or surgical revisions to the anastomoses were required. Conclusions PARD with dOFD contributes to the protection of anastomosis after ILE. Negative pressure applied to the dOFD (a nasogastric tube) enables enteral nutrition to be delivered simultaneously with permanent evacuation and decompression.

A novel design on smooth rotor profile with meshing clearance for screw vacuum pump

Cross-section profile of rotor takes a great effect on the performance of dry-screw vacuum pump. A novel smooth rotor profile consisting of eight segments of curves, including arcs and conjugate correction curves is proposed. Advantages are that it can be used to solve the unsmooth connection and no meshing clearance in traditional profile. The meshing model for new profile can directly generate stable addendum clearance, tooth clearance, tooth side clearance, and radial clearance. The influences of the epicycloid rotation angle, arc radius and involute offset distance of the conjugate correction curve on the clearances are studied according to established theoretical model. And transient flow field of vacuum pump is analyzed by using the commercial software Ansys-Fluent®. Compared to traditional screw vacuum pump, the results shows that pressure in inlet and pump cavity is lower, and maximum pumping speed is higher, indicating that the proposed design is superior.

Design and Implementation of a Vacuum Forming Machine

The purpose of this work is to present the design of a laboratory scale vacuum forming machine, which can be used for the processing of thermoplastic sheets. The designed machine can process an A4 format plastic sheet. An important consideration in the design process was to follow a cost-effective approach. The vacuum forming instrument is made for educational purposes in the framework of a final project for the Polymer Technology Laboratory of the Department of Mechanical Engineering of the Sapientia EMTE University in Târgu Mureș. The structure and the operation of the machine is similar to that found in the industry. However, the cost of production is significantly lower. The main components of the machine include the frame, heater, vacuum pump and the clamping device.

Quantification of Airborne Concentrations of Nano And Micro Scale Phosphor Particles In The Manufacturing environment by Spectrofluorometric Method

In this work, nanoscale luminescent materials dispersed in the air were collected and quantified by the fluorescence spectroscopy. A well-known phosphor; LuAG:Ce3+ was chosen as the model particle due to its strong, measurable and repeatable signal which can easily be excited by the blue light and emits at yellow wavelengths. The ionic liquid modified polymethylmethacrylate based filters were fabricated by electrospinning technique. Samples were collected by means of a vacuum pump from the laboratory environment during the grinding, weighing, transfer, washing, drying and packaging of the phosphorus particles, for different time intervals. The spectrofluorometric method was used for the quantification of the airborne concentration of the nano and microscale dusts. Presented method was also tested in terms of precision, LOD, LOQ, and stability. To the best of our knowledge, this is the first attempt to measure the airborne concentrations of the nano-scale luminescent phosphor particles and can easily be adopted for the quantification of other nanoscale- emitting particles in workplaces. Additionally, the offered design allows miniaturization since it is possible to excite the particles with cost-effective LED based light sources, integrate the system with fiber optics and detect the received optical response by photodiodes.