Design and evaluation of perception reconstruction with sensor system for artificial anal sphincter based on vector similarity

Abstract

Background Artificial organs are playing an increasingly important role in medical field. Artificial anal sphincter, as an example, is a widely used medical device for fecal incontinence. Though it could help patients maintain continence, the issue of perception reconstruction is still unsolved, which means that patients cannot control defecation as desired. Methods In this paper, a novel sensor system based on vector similarity has been analyzed and evaluated. The sensor system is a self‐packaged strain gauge sensor with a small size 14.5 mm × 6 mm, especially for medical device implanted in body to reconstruct perception function. In order to overcome the disadvantages of single threshold judgment, a more accurate and reliable judgment standard for content pressure detection in rectum is developed by using vector similarity method. Therefore, in the novel sensor system, standard multi‐parameters are comprehensive considered. Furthermore, weight‐optimization of sensors are investigated since each sensor has played a different role in detection. Finally, sensor calibration, in vitro and in vivo experiments are established. Results In sensor calibration, the result R2 > 0.99 presents the strain gauge pressure sensor has a good linearity. After that, a series of in vitro experiments have been conducted. The optimized sensor system shows a high accuracy rate in perception reconstruction, which is 87.5% on early warning and 95% on the alarm. In the following in vivo experiments. The results indicate that the average accuracy of the proposed perception reconstruction module has increased by 17.7%, compared with that without optimized sensor system. Conclusions All of these have proven that the novel perception reconstruction module with sensor system based on vector similarity is more acceptable and reliable.

Simulation of artificial anal sphincter motion and interaction with intestinal environment using SOFA

“…2 Since the first implanted devices for incontinence were proposed by Christiansen in 1987, the AAS has been a focus of research in treating FI. [3][4][5][6][7][8] To evaluate the clamping sensing and fecal perception of AAS devices for humans, a series of in vitro and in vivo tests are required. Computational biomechanics provides a useful tool for simulating AAS device interactions with biological structures to advance and optimize devices and reduce, refine, and replace animal models and human cadavers in scientific research.…”

“…Since the first implanted devices for incontinence were proposed by Christiansen in 1987, the AAS has been a focus of research in treating FI 3–8 . To evaluate the clamping sensing and fecal perception of AAS devices for humans, a series of in vitro and in vivo tests are required.…”

A Novel Sensor System for In Vivo Perception Reconstruction Based on Long Short-Term Memory Networks

“…The earliest artificial anal sphincter is inspired by artificial urinary sphincter, which is used to treat urinary incontinence [ 6 ]. At present, the main artificial anal sphincters in clinical use include the American artificial bowel sphincter (ABS) [ 7 , 8 ], the Austrian soft anal band system (SABS) [ 9 ], the British artificial puborectalis anal sphincter system (PAS) [ 10 , 11 , 12 , 13 ] and the French magnetic bead chain artificial anal sphincter (Magnetic Anal Sphincter, MAS) [ 14 , 15 ]. Some progress has been made by these researchers.…”