In designing and calculating the tunnel metallic support,not only the structure's strength and stiffness should be calculated,but also the stability should be checked.

In order to meet with the varied requirement of roadway support, the arc-terrace metallic support is newly developed.

Clinical application on placing metallic stent for advanced gastric cancer with obstruction of digestive tract;

Value and clinic application of planted metallic stents for malignant obstruction disease treatment of esophagus;

Clinical observations on the curative effects of metallic stent in the treatment of malignant gastroduodenal obstruction;

Clinical value of endoscopic metal stenting for malignant left colorectal obstruction;

Comparison of release capacities of drug-eluting on the surface of metal stent;

Methods Twenty six patients were randomly divided into two groups: metal stent group and balloon group.

Results:Stent placement was successful and well tolerated in all 33 patients.

Analysis of risk factors for survival time of patients with malignant esophageal stricture membrane-covered self-expanding esophageal metal stents;