Application of the topological optimization technique to the stents cells design for angioplasty

Guimarães, Tobias Anderson; Oliveira, S. A. G.; Duarte, Maria Antónia

doi:10.1590/s1678-58782008000300012

Cited by 5 publications

(3 citation statements)

References 10 publications

(26 reference statements)

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“…Herrmann et al [145] developed a bistable heart valve prosthesis that can be folded inside a catheter and percutaneously inserted for delivery to the patient's heart for implantation. In designing cardicovascular stents, topology optimization was used to generate optimal geometry of stent cells and maximize the stiffness of the point of application of forces, thereby maintaining structural integrity [146]. However, plastic strains can cause non-uniformity in the expanded portion of the stent.…”

Section: Implants and Deployable Devicesmentioning

confidence: 99%

Surgical Applications of Compliant Mechanisms: A Review

Thomas

Venkiteswaran

Ananthasuresh

et al. 2021

Journal of Mechanisms and Robotics

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Current surgical devices are mostly rigid and are made of stiff materials, even though their predominant use is on soft and wet tissues. With the emergence of compliant mechanisms (CMs), surgical tools can be designed to be flexible and made using soft materials. CMs offer many advantages such as monolithic fabrication, high precision, no wear, no friction, and no need for lubrication. It is therefore beneficial to consolidate the developments in this field and point to challenges ahead. With this objective, in this article, we review the application of CMs to surgical interventions. The scope of the review covers five aspects that are important in the development of surgical devices: (i) conceptual design and synthesis, (ii) analysis, (iii) materials, (iv) manufacturing, and (v) actuation. Furthermore, the surgical applications of CMs are assessed by classification into five major groups, namely, (i) grasping and cutting, (ii) reachability and steerability, (iii) transmission, (iv) sensing, and (v) implants and deployable devices. The scope and prospects of surgical devices using CMs are also discussed.

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Section: Implants and Deployable Devicesmentioning

confidence: 99%

Surgical Applications of Compliant Mechanisms: A Review

Thomas

Venkiteswaran

Ananthasuresh

et al. 2021

Journal of Mechanisms and Robotics

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“…TO based contact analysis of stent and diseased artery is a novel approach to take into account the accurate loading conditions of different plaque types to customise stent architectures according to specific lesions while maintaining vessel lumen area. Although many groups have researched the biomechanical performance of stents using finite element methods [13,[34][35][36][37][38], including very limited stent TO studies [39][40][41], topological optimisation has not been explored in the plaquespecific stent design fields. This paper aims to demonstrate that TO can be used to generate designs that enable recoil to be minimised even in conditions where there are strong variations in material property and surface topology of the lumen side of an artery, particularly in the axial direction.…”

Section: Med-15-1278mentioning

confidence: 99%

A Novel Approach to Design Lesion-Specific Stents for Minimum Recoil

Khan

Brackett

Ashcroft

et al. 2016

Journal of Medical Devices

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“…Herrmann et al [187] developed a bistable heart valve prosthesis that can be folded inside a catheter and percutaneously inserted for delivery to the patient's heart for implantation. In designing cardicovascular stents, topology optimization was used to generate optimal geometry of stent cells and maximize the stiffness of the point of application of forces, thereby maintaining structural integrity [97]. However, plastic strains can cause non-uniformity in the expanded portion of the stent.…”

Section: Implants and Deployable Devicesmentioning

confidence: 99%

Bending the rules: Magnetically-actuated surgical continuum manipulators

Thomas

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Continuum manipulators have revolutionized the field of minimally invasive surgery (MIS) in the past few decades. Major advances in fiber optics, imaging technologies, teleoperation, and haptics have accelerated the development of robot-assisted surgeries. The continuum manipulators used in robot-assisted surgery are equipped with laparoscopic tools as end effectors to augment the hand movements of the surgeon with precision. With robot assistance, surgeons can perform complex procedures inside the human body with high dexterity. However, the continuum robotics research community has challenged the lack of intuitive and effective operation of the surgical tools. Much uncertainty still exists about the tool-tissue interactions which have associated risks of tissue damage caused by unreliable control and articulation of the tool. This problem is further exacerbated by the limited visualization resolution of internal organs of the human body for safe operation. There is a pressing need to develop continuum manipulators with improved maneuverability and control to reach difficult-to-access surgical sites accurately.The aforementioned challenges of MIS play a critical role in the design and development of surgical continuum manipulators. The concept of compliant mechanisms (CMs) has been central to the design of various surgical devices. CMs are flexible mechanisms that use elastic deformation to transfer or transform force, motion, or energy. Devices made of CMs are generally monolithic in nature which leads to simplified fabrication, no wear, no friction, therefore, beneficial in high precision applications. CMs and their sub-components are increasingly used to enhance the range of motion and articulation of surgical continuum manipulators. Recently, magnetic actuation has emerged as a powerful means to execute several surgical functions such as instrument positioning, navigation, grasping, resection, and retraction. Magnetic actuation coupled with CMs has considerable impact in the design of miniaturized manipulators that eliminates the need for any cables tethered for control. Furthermore, accurate modeling of the continuum manipulators and integration of embedded sensing have been effective in the localization of manipulators. Real-time three-dimensional (3D) shape sensing of manipulators in tandem with medical imaging modalities aids in iii closed-loop control strategy to trace different trajectories with the tip of the manipulator is demonstrated. Clinical feasibility of the manipulator as a steerable catheter is shown in phantoms of a bifurcating artery and a heart with the guidance of a miniature camera.Part II explores the concept of variable stiffness mechanisms for surgical applications focusing on grasping and shape locking. Chapter 5 presents a magnetically-actuated variable stiffness robot (VSR). It is made of a soft magnetic elastomer with a sliding nitinol backbone. The synchronised retraction of the backbone with magnetic actuation leads to high deformation coiling action of the VSR. The grasping of ...

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Application of the topological optimization technique to the stents cells design for angioplasty

Abstract: Restoring the internal lumen of arteries by employing an expandable mesh (stent) of

Cited by 5 publications

References 10 publications

Surgical Applications of Compliant Mechanisms: A Review

Surgical Applications of Compliant Mechanisms: A Review

A Novel Approach to Design Lesion-Specific Stents for Minimum Recoil

Bending the rules: Magnetically-actuated surgical continuum manipulators

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