The organ function preservation characteristics of natural orifice specimen extraction (NOSES) surgery for colorectal cancer

［Abstract］ Radical surgery remains the primary treatment for colorectal cancer. In recent years, natural orifice specimen extraction surgery (NOSES) for colorectal cancer has undergone rapid development and demonstrated certain advantages in terms of organ function preservation. NOSES surgery avoids abdominal auxiliary incisions, preserves the integrity of the abdominal wall, reduces incision-related complications and pain, accelerates postoperative recovery, alleviates postoperative anxiety, and enhances patients’ quality of life and psychological state. Patients undergoing successful NOSES surgery for colorectal cancer tend to have earlier-stage disease with smaller tumors, and the risk of postoperative sexual dysfunction is lower. With thorough preoperative assessment and appropriate intraoperative management, postoperative anal dysfunction caused by various factors can be effectively avoided. Based on the practical experience of our center, this article elucidates the characteristics of organ function preservation in NOSES surgery for colorectal cancer from three aspects: abdominal wall function, sexual function, and anal function. The aim is to provide a reference for the high-quality promotion of NOSES surgery for colorectal cancer

An Experimental Investigation of Crossflow Jet Influence on Dilute Gas-Solid Flow in a Rectangular Duct

In this paper an experimental setup was built to investigate jet flow normal to a confined rectangular multiphase crossflow. In order to achieve uniform particle distribution, the inlet and transition channel were carefully designed and adjusted. The experiments were carried out with 2 test conditions, with Rec/Rejet of 7.9 × 104/3.1 × 104 and 7.0 × 104/1.8 × 104. Four classes of particles were used in both of the test conditions. The planar gas flow field and particle distribution on the symmetric cross section were measured by DPIV system. Mean fluid velocity results and transient flow visualization images were used to analyze the jet influence on the gas flow field. In the transient images of some classes of particles, vortex structures were found to be similar but not exactly the same to the free jet structure. A new set of arithmetic was developed to distinguish particle spots from noisy raw images. The results getting from this arithmetic reveals the time-average particle concentration on the jet influence. The analysis proved that the jet control method may set a gas barrier in the flow field to influence the particle distribution. Such an effect is diameter-selective. The experimental results showed a good prospect on the application of wall jet control method in inertia separator.</jats:p

Experimental and numerical analyses of gas–solid-multiphase jet in cross-flow

In this article, jet influence on a gas–solid-multiphase channel flow was experimentally and numerically studied. The jet flow was found to have a diameter-selective controlling effect on the particles’ distribution. Jet flow formed a gas barrier in the channel for particles. While tiny particles could travel around and large particles could travel through, only particles on the 10 -µm scale were obviously affected. Three different calculation methods, Reynolds averaged Navier–Stokes, unsteady Reynolds averaged Navier–Stokes, and detached eddy simulation, were used to simulate this multiphase flow. By comparing the calculation results to the experimental results, it is found that all the three calculation methods could capture the basic phenomenon in the mean flow field. Nevertheless, there exist great differences in the transient flow field and particle distribution.</jats:p