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Based on mass-spring system and pressure model, we firstly present an eyeball model, which is made up of three submodels, to simulate the deformation of cornea in laser thermokeratoplasty. The results show that the shape of the simulated cornea is pretty nearly the same as that of the real one after surgery. Also a control engine of photocoagulation spots is introduced to simulate the loading of the...
Close reduction and internal fixation with 3 hollow annulated screws is a common method for treating fractures of the femur neck. The parameters, for example fracture face angle, empty screw distribution and position, are important to the surgery. These parameters are influence on the surgical effect directly. According to the results of mechanical experiments and QCT (Quantitative computed tomography)...
Computational simulation technology has become an indispensable tool for researchers across the biomechanics discipline. Crucial to the effectiveness of such a tool is its ability to efficiently simulate patient-specific problems. This paper will present a unique and exceptionally efficient approach that converts 3D digital images (provided typically by CT, ultrasound or MRI scanners) directly into...
Numerous studies have demonstrated the efficacy of image-guided needle-based therapy and biopsy in the management of brain cancer. Magnetic Resonance Imaging (MRI) is an ideal modality for guiding and monitoring neurosurgery interventions, due to its excellent visualization of the brain tissues, including cancer tissues, its sub-structure and surrounding tissues. Despite these advantages, MRI scanners...
In order to verify the feasibility of bypass graft treatment for DeBakey III aortic dissection, numerical simulation using computational fluid dynamics method was performed to compare the hemodynamics of non-bypassed and bypassed DeBakey III aortic dissection. The numerical results demonstrated that the flow activity and pressure in the false lumen decreased after the implantation of bypass graft,...
A new biomedical instrument is introduced to apply multiple surgical clips to patients' tissue or vessel. In the surgical process, the instrument jaw is placed around the tissue or other organ structure. When bring the handles of instrument together, the clip can close and secure the tissue or vessel to prevent them from bleeding. With the release of handles, next surgical clip is automatically loaded...
This paper presents a miniature implantable power source that scavenges energy from the expansion and contraction of an artery. The 0.25 cm3 device consists of a piezoelectric thin film embedded within a flexible, self-curling medical-grade silicone cuff. It is expected to enable self-powered implanted microsystems with near-continuous operation, increased lifetime, reduced surgical replacement, and...
Clinical surgeries with internal fixation following Ennecking's type II resection of peri-acetabular tumors are relatively complicated and also there are several different types of functional-reconstruction surgery techniques coming up in recent years. This paper, based on finite element method (FEM) and reverse engineering notion, focused upon the stability of reconstructed pelvis and stress distribution...
Ultrasound waves have been used in these days for most surgeries. They are applied to remove body tissues through surgery, for example in removing eye lens in cataract surgery. In a nutshell, a 3 mm incision near cornea has been created and then after, a folded lens will be implanted and the patient can be released soon after the operation. The process is done by a vibrating metal tip in order to...
The purpose of this study is to analyze the pelvic stability after type I resection of iliac tumor. Six adult cadaveric specimens were tested. The iliac subtotal resection models were established according to Ennecking' s type I resection. Markers were affixed to the key regions of the pelves. Axial loading from proximal lumbar was applied by MTS load cell in the gradient from ON to 500 N in the double...
Total hip replacement and hip resurfacing arthroplasty are two popular methods for curing the diseases of hip joints to date. While the technology can be considered to be mature, there are still some problems in practice. So, another method, hemi-hip joint arthroplasty, was introduced in this paper. The structure and materials of the prothesis, its experiments in vitro and the long-term follow-up...
In this paper the design of a novel modular hydraulic/pneumatic actuated tele-robotic system and a new infrastructure for MRI-guided intervention for closed-bore MRI- guided neurosurgery are presented. Candidate neurosurgical procedures enabled by this system would include thermal ablation, radiofrequency ablation, deep brain stimulators, and targeted drug delivery. The major focus is the application...
The development of artificial joints is now considered to be quite mature, and is the main treatment for osteoarthritis. However, in recent unicompartmental knee arthroplasty clinical follow-ups, complications due to the wearing of polyethylene (PE) tibial components still exist. Therefore, the purpose of this study was to analyze the relation between insert wearing and components alignment in unicompartmental...
For successful navigation during total knee replacement, it is elementary to determine the hip rotation centre accurately in order to adjust the geometrically correct position of a knee implant with respect to the mechanical leg axis. Current techniques rely on markers pinned on the moving distal femur, but there are no detail reports about the influence of the femoral moving range on accuracy of...
This paper gives a comparison of results obtained from numerical simulation and experimental measurements made in vitro pig liver with a water-cooled microwave ablation antenna. An axis-symmetric finite element model was developed to simulate the temperature field based on the pennes bioheat equation, in which the convection heat transfer of the cooling water was involved. The temperature curves and...
Cerebrovascular diseases are one of the three major mortalities in China, such as the rupture of cerebral aneurysm. The growth mechanism of the cerebral aneurysm has not been clearly understood. In this research, we are introducing a numerical simulation tool, computational fluid dynamics (CFD) technique, to simulate and predict the hemodynamics of blood passing through the cerebral aneurysms. Endovascular...
To characterize the effect of thermally significant blood vessels (TSBV) on heat transfer inside the tissues during cryosurgery, the bioheat transfer equations controlling both the normal and the tumor tissues together with the Navier-Stokes equations controlling the blood flow inside the blood vessel were numerically solved. The tissues were treated as non-ideal materials with temperature dependent...
Monitoring and controlling the depth of anesthesia during a surgery is really important since over dosing and under dosing can be dangerous for the patients. The model which is used for describing the relationship between input anesthetic agents and output patient endpoint variables is pharmacokinetic- pharmacodynamic model which included the most significant covariates such as age and weight. Bispectral...
Drilling is an essential part of internal fixation in orthopaedic and trauma surgery. The temperature rise during bone drilling is an important index to the damage of bone. In this study, an elastic-plastic dynamic finite element model is used to simulate the process of a drill bit drilling through the bone. Various initial temperatures of drill bit are investigated to explore the effects of this...
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