Design and analysis of a novel endoscopic successive hemostasis and closing device / 医用生物力学

ABSTRACT

Objective To design a novel endoscopic successive hemostasis and closing device, and to validate whether the device can meet the needs of tissue closure by finite element analysis. Methods By using the novel device, the target tissue was clamped and the clip was then pushed to pierce the tissue. Under the compression between the clip and the inner side of the grasper, the thinner arms of the clip were forced to bend and close to stay in the tissue, and then the inverse displacement of 2 mm was applied on the clip. The elastic limit and tensile strength of the clip were set as 239.0 and 901.0 MPa, respectively. Results Deformation did not occur in the piercing process of the clip, with the maximum stress of 212.6 MPa. The deformed shape of the clip in the bending process matched its design expectation, with the maximum stress of 727.7 MPa. The maximum stress of the clip was 75.8 MPa under 2-mm inverse displacement. Material failure was not found in the bending process or with 2-mm inverse displacement, and the maximum stress in the whole process was 741.0 MPa. Conclusions The novel endoscopic successive hemostasis and closing device proposed in this study can deploy 4 clips at one time, together with an independent grasper for gathering tissues, which can shorten the reloading time and improve the accuracy of clip deployment. The effectiveness and safety of the device is also proved by using finite element method.