Experimental assessment of a novel artificial anal sphincter with shape memory alloy

Wang, Minghui; Liu, Yunlong; Nong, Qingjun; Yu, Hongliu

doi:10.1111/aor.14177

Cited by 9 publications

(7 citation statements)

References 19 publications

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“…81 No adverse influence on blood serum chemistry was found. 85 Referring to the most recent articles, a novel AAS was proposed by Wang et al 82 composed of two upper claws, two lower claws, two clamping elements, two superelastic SMA sheets, and two ropes with position limits (Figure 3B). The upper claw is connected to the lower claw by hinges, and the rope with a position limit is a link between the clamping element connected and the upper claw.…”

Section: Fi Treatmentmentioning

confidence: 99%

“…Motor and spring‐loaded AS devices. AS‐SMA II (A) (reproduced with permission from Elsevier), 81 AS‐SMA (B) (reproduced with permission from Wiley), 82 PAAS (C) 83 (reproduced with permission from Wiley), AASNCM (D) (reproduced with permission from Wiley), 84 SphinKeeper (E) (image from open access paper), 70 TMOD (F) (image from open access paper), 42 and ARTUS (G) (reproduced with permission from Wiley) 12 …”

Section: In‐commerce Self‐expandable Prostheses Assmentioning

confidence: 99%

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Artificial sphincters: An overview from existing devices to novel technologies

et al. 2022

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Artificial sphincters (ASs) are used to replace the function of the biological sphincters in case of severe urinary and fecal incontinence (UI and FI), and gastroesophageal reflux disease (GERD). The design of ASs is established on different mechanisms, e.g., magnetic forces or hydraulic pressure, with the final goal to achieve a implantable and durable AS. In clinical practice, the implantation of in‐commerce AS is considered a reasonable solution, despite the sub‐optimal clinical outcomes. The failure of these surgeries is due to the malfunction of the devices (between 46 and 51%) or the side effects on the biological tissues (more than 38%), such as infection and atrophy. Concentrating on this latter characteristic, particular attention has been given to the interaction between the biological tissues and AS, pointing out the closing mechanism around the duct and the effect on the tissues. To analyze this aspect, an overview of existing commercial/ready‐on‐market ASs for GERD, UI, and FI, together with the clinical outcomes available from the in‐commerce AS, is given. Moreover, this invited review discusses ongoing developments and future research pathways for creating novel ASs. The application of engineering principles and design concepts to medicine enhances the quality of healthcare and improves patient outcomes. In this context, computational methods represent an innovative solution in the design of ASs, proving data on the occlusive force and pressure necessary to guarantee occlusion and avoid tissue damage, considering the coupling between different device sizes and individual variability.

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Section: Fi Treatmentmentioning

confidence: 99%

Section: In‐commerce Self‐expandable Prostheses Assmentioning

confidence: 99%

Artificial sphincters: An overview from existing devices to novel technologies

et al. 2022

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“…SMA is a material that has the ability to change its shape in response to changes in temperature 71 . AUS based on SMA uses the shape memory effect of the material to open and close the urethra.…”

Section: Discussionmentioning

confidence: 99%

“…SMA is a material that has the ability to change its shape in response to changes in temperature. 71 AUS based on SMA uses the shape memory effect of the material to open and close the urethra. This property ensures a significant increase in the design and optimization space of the device.…”

Section: Magnetically Controlled Aus Based On Novel Activationmentioning

confidence: 99%

Magnetically controlled artificial urinary sphincter: An overview from existing devices to future developments

et al. 2023

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Background Urinary incontinence is a common clinical problem in the world today. Artificial urinary sphincter is a good treatment approach for severe urinary incontinence, which is designed to mimic the action of the human urinary sphincter and assist patients to regain urinary function. Methods There are many control methods based on artificial urinary sphincter, such as hydraulic control, electromechanical control, magnetic control, and shape memory alloy control. In this paper, the literature was first searched and documented based on PRISMA search strategy for selected specific subject terms. Then, a comparison of artificial urethral sphincters based on different control methods was conducted, and the research progress of magnetically controlled artificial urethral sphincters was reviewed, and their advantages and disadvantages were summarized. Finally, the design factors for the clinical application of magnetically controlled artificial urinary sphincter are discussed. Results As magnetic control allows for non‐contact force transfer and does not generate heat, it is proposed that magnetic control may be one of the more promising control methods. The design of future magnetically controlled artificial urinary sphincters will need a variety of considerations, including the structural design of the device, manufacturing materials, manufacturing costs, and convenience. In addition, validation of the safety and effectiveness of the device and device management are equally important. Conclusions The design of an ideal magnetically controlled artificial urinary sphincter is of great importance to enhance patient treatment outcomes. However, there are still great challenges to be faced for the clinical application of such devices.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Liu,

Wang,

Yan

et al. 2023

Artificial Organs

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BackgroundArtificial anal sphincter is an implantable medical device for treating fecal incontinence. Reasonable simulation facilitates the advancement of research and reduces experiments on biological tissue. However, the device's clamping motion and sensor interaction with the intestine in the simulation still require further exploration. This article presents a simulation of the artificial anal sphincter's clamping and sensing and its interaction with the intestinal environment using the Simulation Open Framework Architecture (SOFA).MethodsFirstly, the proposed simulation algorithm and its principles in SOFA are analyzed. Secondly, the clamping motion and sensor system of the artificial anal sphincter are simulated. Thirdly, a finite element model of intestine is established based on the properties of intestinal soft tissue. Finally, the in vitro experiments are performed.ResultsThe simulation results indicate that the sensor system of the artificial anal sphincter has good sensing performance during the clamping motion and fecal accumulation process. Experiments have shown that optimal sensory capabilities can be achieved as the posture of the artificial anal sphincter with a roll angle between 20° and 40°. The comparison demonstrates a mean absolute error of 10%–20% between simulation and in vitro experimental results for sensor forces, which verifies the effectiveness of the simulation.ConclusionThe proposed novel simulation achieves a more comprehensive interaction between the artificial anal sphincter motion and intestinal environment. This study may provide more effective simulation data for guidance in improving the performance of sensor perception of artificial anal sphincter for further research.

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Experimental assessment of a novel artificial anal sphincter with shape memory alloy

Cited by 9 publications

References 19 publications

Artificial sphincters: An overview from existing devices to novel technologies

Artificial sphincters: An overview from existing devices to novel technologies

Magnetically controlled artificial urinary sphincter: An overview from existing devices to future developments

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

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