Assessment of a novel artificial anal sphincter with constant force

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1183-1190
Author(s):  
Minghui Wang ◽  
Hongliu Yu

Fecal incontinence caused by sphincter dysfunction is an unresolved problem which has a serious effect on patients, both physically and psychologically. For patients with severe symptoms, treatment with an artificial anal sphincter could be a potential option to restore continence. Acticon Neosphincter still has safety and efficacy problems, which is the only device certified by the US Food and Drug Administration. The biomechanical compatibility is the key problem of artificial anal sphincter in the clinical application. This paper describes an artificial anal sphincter with superelastic shape memory alloys and its mechanical properties assessment in artificial intestine models. The new design was developed as a low invasive and constant force or pressure prosthesis with a simple structure to solve the problem of severe fecal incontinence in patients.

2003 ◽  
Vol 237 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Francis Michot ◽  
Bruno Costaglioli ◽  
Anne-Marie Leroi ◽  
Philippe Denis

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Dorota Żelazny ◽  
Michał Romaniszyn ◽  
Piotr Wałęga

Introduction. Severe fecal incontinence describes a condition of complete loss of control over fundamental physiological functions and loss of abilities to fulfil psychosocial functions by the patients. The last-step procedure, that is, to restore hope for improvement of biopsychosocial functioning and quality of life determined by the patient’s health status is implantation of an artificial anal sphincter. Objective. The study was a comparative analysis of the effect of the employed surgical procedure upon the degree of defecation control and quality of life indices in its behavioral, mental, and social aspects prior to and 3, 6, and 12 months postoperatively. The analysis also included the effect of the patient’s individual style of coping with stress and the functional outcome of the procedure. Material and Methods. The study included a group of 12 patients: 6 females and 6 males, aged from 36 to 60 years of life. The tools consisted of scoring systems that measured symptom intensity (FISI and Jorge and Wexner scale). In assessing the psychosocial functioning, the authors employed the Fecal Incontinence Quality of Life Scale (by Rockwood). The individual mode of coping with the disease was evaluated by using the CISS scale by Endler and Parker. Conclusions. The analysis of results demonstrated that the procedure of implanting an artificial anal sphincter affected the “continence” (up to 50–60% postoperatively) and led to improvement in psychosocial functioning in all its assessed aspects, i.e., lifestyle, employment of precautionary measures, depression, anxiety, and embarrassment. It was also noted that due to the specific character of the procedure (the necessity to operate an artificial implant), better mean results in assessment of the procedure functionality were achieved by patients presenting the goal-concentrated mode rather than emotions-concentrated mode of coping with the disease. Thus, it seems justified to state that assessment of biopsychological functioning may be a good criterion of the procedure effectiveness.


2021 ◽  
Vol 15 (3) ◽  
Author(s):  
Peng Zan ◽  
Qiao Ding ◽  
Banghua Yang ◽  
Guofu Zhang ◽  
Yingjie Xue ◽  
...  

Abstract Anal incontinence, also known as fecal incontinence, refers to the loss of the body's ability to accumulate and control the liquid, solid, and gas contents in the rectum, increasing the frequency of bowel movements. It is a symptom of defecation disorders. The artificial anal sphincter provides a new solution for clinical treatment. In this paper, in order to solve the problem of biomechanical compatibility of the actuator of the artificial anal sphincter system, the original actuator was improved. The model of the rectum and the actuator was constructed by ANSYS. The mechanical finite element analysis of the clamping mechanism was carried out by simulating sphincter behavior, and the displacement cloud diagram and stress cloud diagram of the clamping rectum were obtained. in vitro experiments were carried out using pig intestine to simulate the rectum, which verified the effectiveness of the actuator. The results of the experiment show that the successful rate of holding the rectum reached 96% under the condition of ensuring the normal blood supply to the rectum. It fully proves that the actuator has good biomechanical compatibility.


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