Advances in collision detection and non‐linear finite mixed element modelling for improved soft tissue simulation in craniomaxillofacial surgical planning

Wang, Shengzheng; Yang, Jie; Gee, James C.

doi:10.1002/rcs.286

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…The bone failure criterion used in this study was the maximum main stress, with the critical value range reported in the literature of 0.13-0.34 MPa. Although current articles suggest the use of maximal deformation as the criterion of bone failure, results differing from those obtained in the present study would only be possible with models containing more elaborate materials than the linear elastic model used herein (16,19,(27)(28)(29).…”

Section: Discussioncontrasting

confidence: 73%

Assessment of nose protector for sport activities: finite element analysis

Coto

Meira

Dias

et al. 2011

Dental Traumatology

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– There has been a significant increase in the number of facial fractures stemming from sport activities in recent years, with the nasal bone one of the most affected structures. Researchers recommend the use of a nose protector, but there is no standardization regarding the material employed. Clinical experience has demonstrated that a combination of a flexible and rigid layer of ethylene vinyl acetate (EVA) offers both comfort and safety to practitioners of sports. The aim of the present study was the investigation into the stresses generated by the impact of a rigid body on the nasal bone on models with and without an EVA protector. For such, finite element analysis was employed. A craniofacial model was constructed from images obtained through computed tomography. The nose protector was modeled with two layers of EVA (1 mm of rigid EVA over 2 mm of flexible EVA), following the geometry of the soft tissue. Finite element analysis was performed using the LS Dyna program. The bone and rigid EVA were represented as elastic linear material, whereas the soft tissues and flexible EVA were represented as hyperelastic material. The impact from a rigid sphere on the frontal region of the face was simulated with a constant velocity of 20 m s−1 for 9.1 μs. The model without the protector served as the control. The distribution of maximal stress of the facial bones was recorded. The maximal stress on the nasal bone surpassed the breaking limit of 0.13–0.34 MPa on the model without a protector, while remaining below this limit on the model with the protector. Thus, the nose protector made from both flexible and rigid EVA proved effective at protecting the nasal bones under high‐impact conditions.

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Section: Discussioncontrasting

confidence: 73%

Assessment of nose protector for sport activities: finite element analysis

Coto

Meira

Dias

et al. 2011

Dental Traumatology

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“…For the multiarm robot for mandible reconstruction surgery with three arms, its workspace is adjusted to the size of patient's head. Due to the overlap of the workspaces of each arm, the interference is prone to happen, causing a collision [30]. Based on the LSS (Linearly Swept Sphere) linear scan ball model of the rod, the collision avoidance motion control was researched by C-space model, the C-space mapping of obstacle, and improved heuristic A * search algorithm in order to guarantee the surgery safety.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Spatial Registration for a Three-Arm Robot Assisted Mandible Reconstruction Surgery

Wang

Duan

2015

Mathematical Problems in Engineering

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The three-arm surgical robot system assisted mandible reconstruction surgery (TMR-MRS) is developed to repair the mandible defects caused by congenital defect, trauma, or acquired disease. The surgical robot system is divided into four parts, including 3D reconstructed image subsystem, robotic subsystem, optical measurement subsystem, and patient subsystem. The spatial registration based on quaternion is proposed to obtain the transformation relationship between four surgical subsystems. A method of hand-eye coordination is presented to control the end-effector of the robot arm to target position according to surgical planning. A least square error criterion is developed to optimize and compensate the hand-eye coordination method. In addition, the position of fibular implant in the robot space is calculated when it is grasped by end-effector of robot middle arm. Finally, the positioning accuracy tests and skull model experiments were conducted to evaluate the function of the surgical robot system. The results validate its feasibility and are consistent with the preoperative surgical planning.

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A new fast nonlinear modeling of soft tissue for surgical simulation

2014

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In this paper, soft tissue is modeled by a mass-spring-damper system and tissue deformations under the compression of surgical instruments are simulated. For this purpose, soft tissue confined in a cubic plastic mold is studied using a nonlinear viscoelastic model. Displacements resulting from probe insertions are measured and modeled for use in robotic surgery. Data is collected on bovine sirloin using the Instron hardness tester. The model's dynamic equations are obtained in the form of ordinary differential equations. The external force is considered as the input and the resulting deformation as the output of the model. Simulation results are compared with laboratory findings, and the nonlinear model's unknown parameters are estimated. The threshold force and displacement before the tearing of the soft tissue are respectively determined by analyzing the force-time and displacement-time diagrams obtained for the test samples.

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Advances in collision detection and non‐linear finite mixed element modelling for improved soft tissue simulation in craniomaxillofacial surgical planning

Abstract: The experimental results support the novel methodological advancements in collision detection and biomechanical modelling proposed in this work.

Cited by 4 publications

References 31 publications

Assessment of nose protector for sport activities: finite element analysis

Assessment of nose protector for sport activities: finite element analysis

Spatial Registration for a Three-Arm Robot Assisted Mandible Reconstruction Surgery

A new fast nonlinear modeling of soft tissue for surgical simulation

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