Soft Tissue Hybrid Model for Real-Time Simulations.

In this article, a recent formulation for real-time simulation is developed combining the strain energy density of the Spring Mass Model (SMM) with the equivalent representation of the Strain Energy Density Function (SEDF). The resulting Equivalent Energy Spring Model (EESM) is expected to provide information in real-time about the mechanical response of soft tissue when subjected to uniaxial deformations. The proposed model represents a variation of the SMM and can be used to predict the mechanical behavior of biological tissues not only during loading but also during unloading deformation states.

Educative Hybrid Intervention as a Strategy for Reintegration to the Clinical Courses of Undergraduate Students in COVID-19 Pandemic.

The SARS-CoV-2 pandemic generated the need to modify the current clinical educational model with the challenge of promoting safety and the continuity of clinical education through the use of virtual platforms. Since clinical training in hospital institutions cannot be substituted, a strategic training plan was developed to guarantee protection, safety, and academic continuity for students upon returning to clinical clerkships. The objective of this project was to develop and evaluate the impact of a massive hybrid training plan as an educative strategy to give the theoretical and practical knowledge required for the safe return of undergraduate students to their respective clinical activities in the context of this pandemic.

Single-operator cholangioscopy and electrohydraulic lithotripsy for the treatment of Mirizzi syndrome.

Introduction: Mirizzi syndrome is an infrequent complication of long-standing cholelithiasis. Extrinsic compression of the common hepatic duct is usually caused by an impacted stone in Hartmann's pouch or cystic duct resulting in the development of cholecystobiliary fistula. This syndrome is classified based on the presence and severity of cholecystobiliary fistula.

LAPKaans: Tool-Motion Tracking and Gripping Force-Sensing Modular Smart Laparoscopic Training System.

Laparoscopic surgery demands highly skilled surgeons. Traditionally, a surgeon's knowledge is acquired by operating under a mentor-trainee method. In recent years, laparoscopic simulators have gained ground as tools in skill acquisition.

Effect of Surgical Expertise on Biomechanical Properties of Sutures After Abdominal Wall Closure.

Background: Despite preventive methods and careful surgical technique, surgical site infection and incisional hernias are of main concern after the closure of surgical incisions and keep haunting abdominal wall wound healing. The aim of this study is to find how surgical expertise level modifies biomechanical properties of sutures commonly used in abdominal wall fascial closure (polypropylene, polyglactin 910, polydioxanone).

Materials And Methods: Surgery residents with different experience levels performed abdominal wall fascial closure in swine models with the previously mentioned suture materials.

Past, Present and Future of Surgical Meshes: A Review.

Surgical meshes, in particular those used to repair hernias, have been in use since 1891. Since then, research in the area has expanded, given the vast number of post-surgery complications such as infection, fibrosis, adhesions, mesh rejection, and hernia recurrence. Researchers have focused on the analysis and implementation of a wide range of materials: meshes with different fiber size and porosity, a variety of manufacturing methods, and certainly a variety of surgical and implantation procedures.

Surgical Site Infection Rate Drops to 0% Using a Vacuum-Assisted Closure in Contaminated/Dirty Infected Laparotomy Wounds.

Wound site infections increase costs, hospital stay, morbidity, and mortality. Techniques used for wounds management after laparotomy are primary, delayed primary, and vacuum-assisted closures. The objective of this study is to compare infection rates between those techniques in contaminated and dirty/infected wounds.

Design Concepts of Polycarbonate-Based Intervertebral Lumbar Cages: Finite Element Analysis and Compression Testing.

This work explores the viability of 3D printed intervertebral lumbar cages based on biocompatible polycarbonate (PC-ISO® material). Several design concepts are proposed for the generation of patient-specific intervertebral lumbar cages. The 3D printed material achieved compressive yield strength of 55 MPa under a specific combination of manufacturing parameters.

Influence of PEEK Coating on Hip Implant Stress Shielding: A Finite Element Analysis.

Stress shielding is a well-known failure factor in hip implants. This work proposes a design concept for hip implants, using a combination of metallic stem with a polymer coating (polyether ether ketone (PEEK)). The proposed design concept is simulated using titanium alloy stems and PEEK coatings with thicknesses varying from 100 to 400 μm.

[Gallbladder agenesis. Case report].

Background: Gallbladder agenesis is a very rare congenital abnormality of the biliary tract. The diagnosis is made during surgery, because all preoperative studies have failed to identify this malformation. The purpose of this article is to present a case of gallbladder agenesis diagnosed during surgery, its management, and a review of the literature.

Incidental benign metastasizing leiomyoma in a patient with bone sarcoma: a case report.

Background. The benign metastasizing leiomyoma is an exceptionally rare entity; it presents with ectopic leiomyoma nodules with a benign pattern. Symptoms vary according to the anatomic location.

Irrigation with bupivacaine at the surgical bed for postoperative pain relief after laparoscopic cholecystectomy.

Purpose: The aim of this study was to evaluate the effect of bupivacaine irrigated at the surgical bed on postoperative pain relief in laparoscopic cholecystectomy patients.

Methods: This study included 60 patients undergoing elective laparoscopic cholecystectomy who were prospectively randomized into 2 groups. The placebo group (n=30) received 20cc saline without bupivacaine, installed into the gallbladder bed.

Evaluation of a surgical simulator as used by students with different experience levels.

Background: Historically, the operating room has been the training setting for both surgeons and students. Nowadays, an alternative is represented by surgical simulators. In the same way a not-very-well-built mirror cannot reflect trustworthy images (distortion), a not well-built, calibrated or programmed simulator will be unable to reflect the training level of the operator.

[Laparoscopic subtotal colectomy. Results from the Texas Endosurgery Institute].

Background: Laparoscopy is currently and progressively gaining acceptance for the management of colorectal disease. More bleeding and longer operating time were initially considered as contraindications to perform laparoscopic colon resections. Other obstacles were technical difficulties, the learning curve and the need for specialized instruments; however, improvements in surgical techniques and technological developments have allowed subtotal laparoscopic colectomy to be feasible.

[Laparoscopic splenectomy: Twelve-year experience in two private institutions].

Background: In 1991, Delaitre et al. reported the first successful laparoscopic splenectomy. This procedure has become the best option in patients with hematological diseases and who require surgical treatment.