Although some design modifications are necessary to reduce current complications, the polyurethane-covered retrievable nitinol stent seems feasible for use in the urethra. Stent-induced granulation tissue formation improved after stent removal.
The 2wt% Si-substituted hydroxyapatite (Si-HA) powder was prepared by a precipitation method and sintered to form a disk-shaped Si-HA (98% dense, 10 mm diameter and 1.5 mm thick) specimen at 1200 o C for 3 hrs. After polishing the surfaces of specimen with the 2000-grit SiC metallographic paper, the cell proliferation experiment was performed as in vitro test at various times from 3 to 24 hrs. In addition, for in vivo study, four Si-HA specimens (1 mm x 1 mm x 10 mm) were implanted into the paravertebral muscle of a rabbit. As the results, symptoms of hemorrhage, necrosis and discolorations were not macroscopically observed on the surrounding areas of the implants, and typical foreign body reaction, without neutrophil, was revealed from microscopical observation. Therefore, the biocompatibility of Si-HA seems to be good and it is a feasible material as bone substitute.
ObjectiveTo evaluate the usefulness of newly designed sheaths for gastroduodenal intervention in a gastric phantom and dogs.Materials and MethodsA regular sheath was made using a polytetrafluoroethylene tube (4 mm in diameter, 90 cm long) with a bent tip (4 cm long, 100 degree angle). For the supported type of sheath, a 5 Fr catheter was attached to a regular sheath to act as a side lumen. To evaluate their supportability, we measured the distance of movement of the sheath's tip within a silicone gastric phantom for three types of sheath, the regular type, supported type, and supported type with a supporting guide wire. The experiments were repeated 30 times, and the results were analyzed using ANOVA with the postHoc test.In addition, an animal experiment was performed in six mongrel dogs (total: 12 sessions) to evaluate the torque and supportability of the sheaths in the stomach, while pushing a guide wire or coil catheter under fluoroscopic guidance.ResultsIn the guide wire application, the distances of movement of the sheath tip in the three types of sheath, the regular type, supported type, and supported type with supporting guide wire, were 8.40±0.51 cm, 6.23±0.41 cm, and 4.47±0.32 cm, respectively (p < 0.001). In the coil catheter application, the corresponding values were 7.22±0.70 cm, 5.61±0.31 cm and 3.91±0.59 cm, respectively (p < 0.001).All three types of sheath rotated smoothly and enabled both the wires and catheters to be guided toward the pylorus of the dog in all cases.ConclusionThe newly designed sheaths can be useful for gastroduodenal intervention.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.