Novel characteristics of traction force in biliary self-expandable metallic stents.
Dig Endosc
; 29(3): 347-352, 2017 May.
Article
em En
| MEDLINE
| ID: mdl-28032654
ABSTRACT
BACKGROUND AND AIM:
In recent years, knowledge concerning the mechanical properties of self-expandable metallic stents (SEMS) has increased. In a previous study, we defined traction force and traction momentum and reported that these characteristics are important for optimal stent deployment. However, traction force and traction momentum were represented as relative values and were not evaluated in various conditions. The purpose of the present study was to measure traction force in various situations assumed during SEMS placement.METHODS:
Traction force and traction momentum were measured in non-stricture, stricture, and angled stricture models using in-house equipment.RESULTS:
Stricture and angled stricture models had significantly higher traction force and traction momentum than those of the non-stricture model (stricture vs non-stricture traction force, 7.2 N vs 1.4 N, P < 0.001; traction momentum, 237.8 Ns vs 62.3 Ns, P = 0.001; angled stricture vs non-stricture traction force, 7.4 N vs 1.4 N, P < 0.001; traction momentum, 307.2 Ns vs 62.3 Ns, P < 0.001). Traction force was variable during SEMS placement and was categorized into five different stages, which were similar in both the stricture and angled stricture models.CONCLUSIONS:
We measured traction force and traction momentum under simulated clinical conditions and demonstrated that strictures and the angular positioning of the stent influenced the traction force. Clinicians should be aware of the transition of the traction force and should schedule X-ray imaging during SEMS placement.Palavras-chave
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Doenças Biliares
/
Stents Metálicos Autoexpansíveis
/
Modelos Teóricos
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Dig Endosc
Assunto da revista:
DIAGNOSTICO POR IMAGEM
/
GASTROENTEROLOGIA
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Japão