Structural improvement and analysis of a novel endoscopic succession closing device
10.16156/j.1004-7220.2017.02.06
- VernacularTitle:新型内镜连续缝合器械的结构改进及分析
- Author:
Ming-yang LI
1
;
Shu-chen GE
1
;
Liao-yuan AI
1
;
Cheng-li SONG
1
;
Bing HU
2
Author Information
1. Shanghai Institute for Minimally Invasive Therapy, School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology
2. Department of Endoscopy, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University
- Publication Type:Journal Article
- Keywords:
Endoscopic closing device;
Clamp;
Anti-slippage;
Finite element analysis
- From:
Journal of Medical Biomechanics
2017;32(2):E137-E142
- CountryChina
- Language:Chinese
-
Abstract:
By developing a novel endoscopic succession closing device to overcome the shortcomings of existing devices that cannot deploy several clips at a time, to perform structural analysis on different clamp structures and to validate their performances in tissue closure through finite element analysis. Methods Comparative analyses of three clamp structures, namely, the aligning tooth structure (original, clamp A), the staggered tooth structure (clamp B), a combination structure with page break angle and staggered tooth (clamp C), were performed to analyze pressure and its distribution on tissues when clamping the stomach wall. Displacement of 7.5 mm was then applied on the clamps to simulate the effect of the operating procedures of the device and tissue kick-back. Results The maximum stresses of the clamp A and B were located on the first pair of teeth which was closest to the rotating shaft, with the stress being 10.39 kPa and 10.11 kPa, respectively. The maximum stress (11.35 kPa) of the clamp C was located on the second pair of teeth. For clamp A and B, the longer the distance to shaft, the larger pressure on stomach tissues. While for clamp C, the pressure on device-tissue interface showed little change along the path. Under tensile displacement, clamp A and B slipped off from the tissue when displacements reached to 5 mm and 6.5 mm, respectively, while clamp C did not. Conclusions Clamp with page break angle and staggered tooth can exert the uniform max pressure to tissues and provide a larger contact area away from the rotating shaft, thus improving anti-slippage and performance of the novel endoscopic closing device.
