Toward the Next Generation of Passive Micromixers: A Novel 3-D Design Approach.

Passive micromixers are miniaturized instruments that are used to mix fluids in microfluidic systems. In microchannels, combination of laminar flows and small diffusion constants of mixing liquids produce a difficult mixing environment. In particular, in very low Reynolds number flows, e.

Performance Analysis and Numerical Evaluation of Mixing in 3-D T-Shape Passive Micromixers.

In micromixer devices, laminar characteristics of the flow domain and small diffusion constants of the fluid samples that are mixed characterize the mixing process. The advection dominant flow and transport processes that develop in these devices not only create significant challenges for numerical solution of the problem, but they are also the source of numerical errors which may lead to confusing performance evaluations that are reported in the literature. In this study, the finite volume method (FVM) and finite element method (FEM) are used to characterize these errors and critical issues in numerical performance evaluations are highlighted.

Spontaneous rupture of the splenic artery aneurysm: a rare clinical presentation of acute abdomen.

Splenic artery aneurysms are very rare causes of acute abdomen but are important to recognize since they carry high rate of mortality when ruptured. The aim of this study was to present a middle aged man with sudden onset of abdominal pain. Being previously on steroid treatment due to sarcoidosis, the patient developed hypovolemic shock during work-up in diagnostic imaging and went on emergency laparatomy.

Single-incision laparoscopic cholecystectomy: a new retraction technique.

Background: Laparo-endoscopic single site cholecystectomy receives great interest from the surgical community. It has potential for reducing postoperative pain, length of hospital stay and improving cosmesis. Minimally invasive surgeons have been forced to develop techniques for providing adequate retraction of the gallbladder.

The effect of narrowed segment length on the degree of early postoperative dysphagia in laparoscopic Nissen fundoplication.

Background/aims: Although laparoscopic Nissen fundoplication is the gold standard in the surgical treatment of gastroesophageal reflux disease, it may cause troublesome complications like dysphagia. In this study, we demonstrated the effect of narrowed segment length on early dysphagia in patients.

Materials And Methods: Forty-one patients who underwent laparoscopic Nissen fundoplication by a single surgeon between January 2007 and November 2008 were reviewed.

Therapy of solitary cecal diverticulitis in a young patient with laparoscopic right hemicolectomy.

Cecal diverticulum of colon is a relatively rare and benign condition in the western world. The reported frequency is approximately 1 in 300 appendectomies. They are usually asymptomatic but it may cause inflammatory, hemorrhagic, or perforatory complications.

Direct trocar insertion technique for initial access in morbid obesity surgery: technique and results.

Purpose: Obtaining access to the peritoneal cavity in laparoscopic surgery is more difficult in morbidly obese patients. There is no clear consensus as to the optimal method of entry into the peritoneal cavity. This study assesses the safety and feasibility of the direct trocar insertion technique without pre-existing pneumoperitoneum in patients undergoing laparoscopic bariatric surgery.