Analytical Modeling of Ultrasonic Vibration Assisted Drilling of Bones for Medical Surgical Applications

2015 ◽  
Author(s):  
Fanxia Kong ◽  
Yuan-Shin Lee
Keyword(s):  
Ultrasonic Vibration ◽  
Analytical Modeling ◽  
Soft Tissues ◽  
Bone Structure ◽  
Medical Surgery ◽  
Experimental Result ◽  
Bone Drilling ◽  
Bone Surgery ◽  
Force Modeling ◽  
Drilling Accuracy

This paper presents a new analytical modeling of ultrasonic vibration assisted drilling of bones for medical surgery operations. Due to the heterogeneous bone structure and the uneven bone surface, bone surgery cutting suffers from inaccuracy and difficulty in high precision bone surgery cutting. In this paper, a new method of ultrasonic vibration assisted drilling is proposed for bone surgery cutting. An analytical force modeling is presented for ultrasonic vibration assisted bone drilling. Experimental result validates the analytical modeling presented in the paper. Preliminary testing result also shows a significant improvement of drilling accuracy based on the proposed ultrasonic vibration assisted bone drilling. The proposed cutting techniques can be used in bone cutting surgery to increase the accuracy of born drilling position and reduce trauma damage of bone and surrounding soft tissues.

Computer Aided Finite Element Simulation of the Developed Driller System for Bone Drilling Process in Orthopedic Surgery

2019 ◽  
Vol 18 (04) ◽  
pp. 583-594 ◽  
Author(s):  
Kadir Gok ◽  
Arif Gok ◽  
Yasin Kisioglu
Keyword(s):  
Finite Element ◽  
Temperature Rise ◽  
Orthopedic Surgery ◽  
Soft Tissues ◽  
Experimental Results ◽  
Drilling Process ◽  
Drill Bit ◽  
Bone Drilling ◽  
Computer Aided ◽  
Driller System

Heat reveals during the bone drilling operations in orthopedic surgery because of friction between bone and surgical drill bit. The heating causes extremely important damages in bone and soft tissues. The heating has a critical threshold and it is known as 47∘C. If bone temperature value exceeds 47∘C, osteonecrosis occurs in bones and soft tissues. Many factors such as surgical drill bit geometry and material, drilling parameters, coolant has important roles for the temperature rise. Many methods are used to decrease the temperature rise. The most effective method among them is to use the coolant internally. Numeric simulations of a new driller system to avoid the overheating during the orthopedic operating processes were performed in this study. The numerical simulation with/without coolant was also performed using the finite element based software. Computer aided simulation studies were used to measure the bone temperatures occurred during the bone drilling processes. The outcomes from the simulations were compared with the experimental results. A good temperature level agreement between the experimental results and FEA simulations was found during the bone drilling process.

scholarly journals Massive Lingual and Sublingual Haematoma following Postextractive Flapless Implant Placement in the Anterior Mandible

2015 ◽  
Vol 2015 ◽  
pp. 1-4 ◽  
Author(s):  
Luisa Limongelli ◽  
Angela Tempesta ◽  
Vito Crincoli ◽  
Gianfranco Favia
Keyword(s):  
High Risk ◽  
Soft Tissues ◽  
Bone Drilling ◽  
Routine Procedure ◽  
Implant Placement ◽  
First Case ◽  
Mucoperiosteal Flap ◽  
Life Threatening ◽  
Anterior Mandible ◽  
Symptoms And Signs

Dental implants placement in the anterior mandible with flap or flapless technique is a routine procedure and is considered to be safe. However, serious life-threatening complications may occur. We report the first case of massive lingual and sublingual haematoma following postextractive implant placement in the anterior mandible with flapless technique. A 45-year-old female patient underwent placement of four immediately postextractive implants in the anterior mandible using flapless technique. During the procedure, the patient referred intense acute pain and worsening sign of airway obstruction, dysphagia, dyspnea, and speech difficulties. Bimanual compression of the mouth floor, lingual surface of the mandible, and submental skin was maintained for approximately 25 minutes in order to stop the bleeding. Computerized tomography highlighted the massive lingual and sublingual haematoma. The symptoms and signs had almost completely resolved in the next 48 hours. The prevention of these complications is mandatory with clinical and CT analyses, in order to highlight mandibular atrophy and to select carefully the correct length and angulation of bone drilling and to keep more attention to the flapless technique considering the elevation of a lingual mucoperiosteal flap to access the mandibular contour intraoperatively and to protect the sublingual soft tissues and vasculature in high risk cases.

Rare proliferative and inflammatory pathologies localized in the temporal bone - a review of the literature

2019 ◽  
Vol 8 (2) ◽  
pp. 1-5
Author(s):  
Adam Roszkowski Roszkowski ◽  
Alicja Witkowska ◽  
Piotr Baranek ◽  
Anna Rzepakowska ◽  
Emilia Wnuk ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Fibrous Dysplasia ◽  
Temporal Bone ◽  
Inflammatory Pseudotumor ◽  
Soft Tissues ◽  
Bone Structure ◽  
Histopathological Examination ◽  
Fibrous Tissue ◽  
Diagnostic Methods ◽  
Unknown Etiology

Proliferative-inflammatory pathologies may occupy the temporal bone, resulting in: hearing loss, vestibular dysfunction, and neuropathies from cranial nerve compression. Although their occurrence is episodic, the appropriate diagnostic procedure is extremely important to achieve expected therapeutic effect. The aim of study was characterization of selected proliferative-inflammatory pathologies that may occupy the temporal bone: fibrous dysplasia, inflammatory pseudotumor, osteoradionecrosis, and presentation of diagnostic methods for the differentiation of these diseases as well as discussion on appropriate therapeutic options. Fibrous dysplasia (fibrous dysplasia) is a slowly progressive, benign bone disorder of unknown etiology characterized by abnormal proliferation of fibrous tissue. IPT (inflammatory pseudotumor) is a rare, non-malignant inflammatory process of unknown etiology, characterized by connective tissue proliferation and infiltration of inflammatory cells. Osteoradionecrosis of the temporal bone (TB-ORN) is a rare but potentially fatal complication of radiotherapy for head and neck cancer. Due to the similarity of symptoms with typical inflammatory conditions of middle ear (pain, otorrhea, hearing loss), selected disorders may be a dilemma regarding the diagnosis and proper further treatment. The clinical examination is mandatory, however radiological imaging may demonstrate the existence of specific changes and direct the diagnosis. The computed tomography of fibrous dysplasia shows the abnormal organization of the bone structure. Magnetic resonance, as the most sensitive for inflammatory pseudotumors, visualizes inflammatory infiltrates in soft tissues. The spiral tomography of temporal identifies the erosion in the course of osteoradionecrosis. However the final diagnosis may be establish post the histopathological examination and exclusion of the neoplastic process.

Anisotropic Multishell Analytical Modeling of an Intervertebral Disk Subjected to Axial Compression

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Sébastien Demers ◽  
Sylvie Nadeau ◽  
Abdel-Hakim Bouzid
Keyword(s):  
Analytical Modeling ◽  
Soft Tissues ◽  
Intervertebral Disk ◽  
Analytical Models ◽  
Alternative Methods ◽  
Anulus Fibrosus ◽  
Methodological Triangulation ◽  
Improve Model ◽  
Model Realism ◽  
Methods Analytical

Studies on intervertebral disk (IVD) response to various loads and postures are essential to understand disk's mechanical functions and to suggest preventive and corrective actions in the workplace. The experimental and finite-element (FE) approaches are well-suited for these studies, but validating their findings is difficult, partly due to the lack of alternative methods. Analytical modeling could allow methodological triangulation and help validation of FE models. This paper presents an analytical method based on thin-shell, beam-on-elastic-foundation and composite materials theories to evaluate the stresses in the anulus fibrosus (AF) of an axisymmetric disk composed of multiple thin lamellae. Large deformations of the soft tissues are accounted for using an iterative method and the anisotropic material properties are derived from a published biaxial experiment. The results are compared to those obtained by FE modeling. The results demonstrate the capability of the analytical model to evaluate the stresses at any location of the simplified AF. It also demonstrates that anisotropy reduces stresses in the lamellae. This novel model is a preliminary step in developing valuable analytical models of IVDs, and represents a distinctive groundwork that is able to sustain future refinements. This paper suggests important features that may be included to improve model realism.

THE MANAGEMENT OF SOFT TISSUES IN TEMPORAL BONE SURGERY

1955 ◽  
Vol 65 (10) ◽  
pp. 935???969
Author(s):  
KENNETH MCASKILE
Keyword(s):  
Temporal Bone ◽  
Soft Tissues ◽  
Bone Surgery ◽  
Temporal Bone Surgery

Key Factors Affecting the Amplitude of a Composite Ultrasonic Wiredrawing Vibration System

2012 ◽  
Vol 157-158 ◽  
pp. 395-399 ◽  
Author(s):  
Xiao Biao Shan ◽  
Nai Ming Qi ◽  
Li Li Wang ◽  
Tao Xie
Keyword(s):  
Cross Section ◽  
Ultrasonic Vibration ◽  
Variable Cross Section ◽  
Experimental Result ◽  
Variable Cross ◽  
Vibration System ◽  
Key Factors ◽  
Element Analysis ◽  
Factors Affecting ◽  
The Finite Element Analysis

This paper studied the key factors affecting the amplitude of a composite ultrasonic wiredrawing vibration system, for designing a powerful ultrasonic vibration system. The finite element analysis (FEA) was performed. The results showed that the variable cross-section shapes of horns and the angles between the connection of both ends of the cross-section and the center line had great effects on the amplitude of an ultrasonic vibration system. In order to valid the theoretical result, the experiments were carried out on a composite ultrasonic vibration system. The experimental result demonstrated that the conical variable cross-section rods used in an ultrasonic vibration system produced large amplitude.

scholarly journals Effect of Using Coolant on the Formation of Microcracks, Burr and Delamination in Bone Drilling Process

2021 ◽  
Vol 1 (1) ◽  
pp. 17-26
Author(s):  
Rusnaldy Rusnaldy ◽  
Pratama Eka Putra Sijabat ◽  
Paryanto Paryanto ◽  
Toni Prahasto
Keyword(s):  
Cortical Bone ◽  
Bone Microstructure ◽  
Initial Position ◽  
Burr Formation ◽  
Drilling Process ◽  
Bone Drilling ◽  
Screw Insertion ◽  
Bone Surgery ◽  
Drilling Temperature ◽  
The Stability

Direct approach for bone fracture treatment usually involves restoring the fractured parts to their initial position and immobilizing them with plates, screws and wires. This approach needs a bone surgery drilling to produce hole for screw insertion. But this drilling process causes mechanical damages, i.e microcracks, burr formation and delamination, that can reduce the stability of the fixation. One of the ways to minimize it is by using coolant. Moreover, it is noted that bone has anisotropic microstucture. The object of this study is to understand the effect of coolant on mechanical damages that occur in bone drilling and to understand the effect of microstructure difference on microcracks that occur in the drilled walls holes. Adult bovine bones and adult goat bones were used in this study as the specimens to represent differences in cortical bone microstructure. Five consecutive holes from the distal to the proximal in each specimen were generated using manual hand-drill (spindle speed (n) = 1000 rpm; drill bit (d) = 4 mm diameter) with the use of coolant as variation. The drilling holes then stained and observed using a microscope. As the result, it was found that the use of coolant can significantly reduce the drilling temperature. Microcracks, burr formation and delamination were found to be quite large in the drilling holes without coolant. However, there is no microcrack found in the drilling holes with coolant, there is only a small number of burr formation was found. In addition, it was found that the differences in bone microstructure affect the number and length of microcracks that occur in the wall of the hole. It can be concluded from this study that the application of coolant is very effective to reduce the drilling temperature and enhancing the quality of the hole generated by bone drilling and the higher the density of osteon in cortical bone, the easier the microcrack to initiate and propagate.

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