In recent years, the emergence of single-port laparoscopic technology promoted the development of the technology of laparoscopy, but deficiencies like equipment conflict or lack of triangulation severely hampered the clinical application of this technology. The appearance of single-port laparoscopic flexible instruments makes up for those deficiencies to a great extent. The element is to add a wrist joint to the tip of the instrument to form triangulation and reduce equipment conflict. But this technique is still in an early stage of development. The purpose of this article is to summarize the characteristics and problems of existing flexible single-port laparoscopic instruments, and to provide information for the further improvement, finally the future development was expected.
Equipment Design ; Humans ; Laparoscopy ; instrumentation

This study was to build a canine portal hypertension model by intra-portal administration of high polymer material polyurethane and organic solvent tetrahydrofuran mixed solutions in order to evaluate the effectiveness of the model. Twelve local crossbreed dogs were selected randomly, with intra-portal administration of 8% (weight/volume) polyurethane- tetrahydrofuran solutions through an incision in the upper abdomen to build the portal hypertension model. We measured the portal vein pressure before modeling, during modeling, and four-, eight-, and twelve- weeks after modeling, respectively. Then we evaluated the effectiveness of the model comparing values of data with those data obtained before modeling started, which were regarded as the normal values. The results showed that the portal vein pressure rose by 2. 5 times after the solution administrated instantly as much as that before modeling, and maintained at 1. 5 times after 4 weeks. This method presents an easy operation, low animal mortality and reliable model of portal hypertension. Its less abdominal adhesions and its ability in keeping normal anatomic structure specially make it suit for surgical research of portal hypertension.
Animals ; Disease Models, Animal ; Dogs ; Furans ; adverse effects ; Hypertension, Portal ; Polyurethanes ; adverse effects ; Portal Vein ; physiopathology

Liver transplantation is the only way to treat end-stage liver disease. In order to overcome the shortage of donor, marginal donors have been used widely, which bring about a series of problems. Machine perfusion can stimulate the circulation in vivo and is beneficial for the protection of liver. It could also improve the graft function and reduce postoperative complications, which makes it a hot spot in recent years. The aim of this study is to summarize the current status and prospects of application of machine perfusion on clinical liver transplantation.
Humans ; Liver ; Liver Transplantation ; Perfusion ; instrumentation ; methods ; Tissue Donors

OBJECTIVETo evaluate the feasibility of endoscopic gastrostomy combined with magnetic compression techniques in dogs.

METHODSThe magnetic compression device consisted of a couple of cylindrical magnets with a hole in the center. A 14-French gastric tube was inserted through the hole and fixed on the parent magnets. Four male mongrel dogs were selected randomly for the operation. The daughter magnet was placed into the dog's gastric body by a Zebra Guidewire under endoscopy, then a skin incision was performed on the left upper abdomen, through which the subcutaneous tissues and muscle were isolated up to the peritoneum. The parent magnet was placed on the surface of the peritoneum, which attracted the daughter magnet inside the gastric cavity automatically to compress the gastric wall and peritoneum. A needle was inserted through the gastric tube and punctured the tissue in the hole of the magnets repeatedly to form a fistula. After removing the needle, the gastrostomy was complete. The fistula was observed and its specimen was taken two weeks later under laparotomy.

RESULTSAll the four operations were successfully performed, and the operation time was 11-15 minutes. The stoma was matured immediately, through which early enteral nutrition support was administered. The gastric wall and peritoneum were observed with well healing and no adhesion in the abdominal cavity under laparotomy two weeks after the operation.

CONCLUSIONThe gastrostomy performed by magnetic compression technique combined with endoscopy is convenient, minimally invasive and safe, which may be used in future clinical practice.

Abdomen ; Animals ; Catheterization ; Dogs ; Enteral Nutrition ; Gastroscopy ; Gastrostomy ; Laparotomy ; Magnetics ; Male ; Santonin ; analogs & derivatives ; Stomach ; Surgical Stomas ; Wound Healing

Objective To investigate the effects of high intensity electric field on cell growth,apoptosis and microstructure of human pancreatic cancer cell line PANC-1.Methods The PANC-1 cells in the logarithmic growth period were selected,and cells in the high voltage electrical treatment group were treated with high voltage electric field 250,500,750,1000 V/cm,respectively.The effects of different high voltage electric fields on cell growth and microstructure of PANC-1 cells were determined by cell viability,cell death staining,apoptosis detection,transmission electron microscopy and scanning electron microscopy.Results Compared with control group,the high voltage electric pulse significantly inhibited the growth of PANC-1 cells in the field dependent manner.Moreover,when the field was more than 500 V/cm,the cell viability was significantly decreased (P＜0.05).High voltage electric pulse could induce cell apoptosis.When the field was higher than 750 V/cm,serious necrosis was noticed.In the 1000 V/cm group,the integrity of cell membrane and the structure of organelles was seriously damaged.Conclusion High voltage electric pulse could significantly inhibit the growth of PANC-1 cells and would be a promising method in cancer treatment.

A biliary contrast agents pushing device, including a syringe pushing system and a remote controller is introduced. The syringe pushing system comprises an injector card slot, a support platform and an injection bolus fader. A 20 mL syringe can be fitted on the syringe pushing system and kept with the ground about 30 degree. This system can perform air bubble pumping back and contrast agents bolus injection as well as speed adjustment. Remote controller is an infrared remote control which can start and stop the syringe pushing system. With this device, the remote controlled cholangiography technology can be achieved, which can not only protect doctors from X-ray radiation but also improve the traditional T-tube cholangiography and the contrast effect, reduce postoperative complications in patients as well. The application of this device will improve the current diagnosis and treatment system, the device will benefit the majority of doctors and patients.
Contrast Media ; administration & dosage ; Humans ; Injections ; Postoperative Complications ; Syringes

Irreversible electroporation (IRE) is an emerging tissue ablation technique. Compared with thermal ablation technique such as radiofrequency, IRE can achieve focal ablation in a shorter time without heat sink effect while sparing the tissue scaffold. IRE has been demonstrated to be a feasible therapeutic modality for the liver, pancreatic, and prostatic cancer. In recent years, several studies regarding of catheter-directed IRE for digestive tract, bronchus, urinary tract, and myocardium have been performed, which preliminarily demonstrated the safety and efficacy of IRE for tissue ablation under endoscopic or interventional technique. This study summarized the research progress of catheter-directed IRE for tissue ablation. The critical technique and future direction of catheter-based IRE are prosp.
Catheter Ablation ; Catheters ; Electroporation ; Endoscopy ; Humans