Development of a Strain Transferring Sensor Housing for a Lumbar Spinal Fusion Detection System

2006 ◽  
Vol 1 (2) ◽  
pp. 159-164 ◽  
Author(s):  
J. W. Aebersold ◽  
W. P. Hnat ◽  
M. J. Voor ◽  
R. M. Puno ◽  
D. J. Jackson ◽  
...  
Keyword(s):  
Finite Element ◽  
Spinal Fusion ◽  
Detection System ◽  
Spinal Instrumentation ◽  
Strain Sensor ◽  
Internal Surface ◽  
Disc Disease ◽  
Bending Strain ◽  
Exploratory Surgery

Lumbar arthrodesis or spinal fusion is usually performed to relieve back pain, and regain functionality from degenerative disc disease, trauma, etc. Fusion is determined from radiographic images (X-ray) or computed tomography scans, yet these inspection procedures are subjective methods of review. As a result, exploratory surgery is performed if the presence of fusion cannot be confirmed. Therefore, a need exists to provide objective data to determine the presence of fusion that could avoid the cost, pain, and risk of exploratory surgery. One method to achieve this objective is to observe bending strain from spinal rods implanted during surgery. A system has been developed that will attach to the spinal instrumentation rods, transmit strain information wirelessly, and without the use of batteries. Major components of the system include a strain transferring sensor housing, a microelectromechanical (MEMS)-based strain sensor, telemetry circuitry, and antennae. Only discussed herein are the design, testing, and results of the housing without a cover and its ability to transfer strain from the rod to an internal surface where a foil strain gage is attached to characterize strain transfer efficiency. Strain gauges rather than the MEMS sensor were employed for housing characterization due cost and limited availability. Design constraints for the housing are long-term implantation, small size, greater than 95% transfer of bending strain from the spinal rods to the internal strain sensor, and ease of installation. ABAQUS finite element modeling software was employed to develop a working model that was fabricated using polyetheretherkeytone. The housing underwent cycle testing in a material testing system to simulate long-term implantation along with static testing to determine if creep was present. Both series of tests showed that the housing’s response did not degrade over a period of time and there was no indication of creep. The experimental results also validated the results of the ABAQUS finite element model.

scholarly journals Long-Term Effects of Segmental Lumbar Spinal Fusion on Adjacent Healthy Discs: A Finite Element Study

2016 ◽  
Vol 10 (2) ◽  
pp. 205 ◽  
Author(s):  
Gunti Ranga Srinivas ◽  
Anindya Deb ◽  
Malhar N. Kumar ◽  
Goutham Kurnool
Keyword(s):  
Finite Element ◽  
Spinal Fusion ◽  
Lumbar Spinal Fusion ◽  
Long Term Effects ◽  
Finite Element Study ◽  
Lumbar Spinal ◽  
Element Study

scholarly journals Internal Fixation, A Reconstructive Spine Surgery: A Remedy of Long-Term Spinal Problems

2019 ◽  
Vol 9 (1) ◽  
pp. 11-15
Author(s):  
Md Aminul Islam ◽  
Md Abdul Hye Manik ◽  
Rukun Uddin Chowdhury ◽  
Md Al Amin Salek ◽  
Amir Ali ◽  
...  
Keyword(s):  
Internal Fixation ◽  
Spinal Fusion ◽  
Spinal Surgery ◽  
Spinal Instrumentation ◽  
Age And Gender ◽  
Fusion Surgery ◽  
Excellent Outcome ◽  
Spinal Fusion Surgery ◽  
And Gender

Background: Spinal instrumentation provides a stable, rigid column that encourages bones to fuse after spinal fusion surgery. Methods: The study was carried out in the Neurosurgery Center, CMH, Dhaka, from 01 January 2013 to July 31 2018. A total of 95 patients were included with unrestricted age and gender, underwent spinal surgery with fixation. Result: Better outcome was observed in spinal surgery with stabilization. Conclusion: Whereas early (within hours) or immediate (within 48 h) stabilization and indirect or direct decompression has excellent outcome, even delayed stabilization of the unstable spine has benefits. Bang. J Neurosurgery 2019; 9(1): 11-15

Development of capacitive pure bending strain sensor for wireless spinal fusion monitoring

2007 ◽  
Vol 138 (2) ◽  
pp. 276-287 ◽  
Author(s):  
Ji-Tzuoh Lin ◽  
Kevin W. Walsh ◽  
Douglas Jackson ◽  
Julia Aebersold ◽  
Mark Crain ◽  
...  
Keyword(s):  
Spinal Fusion ◽  
Strain Sensor ◽  
Pure Bending ◽  
Bending Strain

Design and simulation of a MEMS capacitive bending strain sensor using dielectric materials for spinal fusion monitoring

2011 ◽  
Author(s):  
Muhammad Irsyad Abdul Mokti ◽  
Inzarulfaisham Abd. Rahim ◽  
Asrulnizam Abd Manaf ◽  
Othman Bin Sidek ◽  
Muhamad Azman Bin Miskam
Keyword(s):  
Spinal Fusion ◽  
Strain Sensor ◽  
Dielectric Materials ◽  
Bending Strain

Effect of single and multilevel artificial inter-vertebral disc replacement in lumbar spine: A finite element study

2021 ◽  
pp. 039139882110018
Author(s):  
Jayanta Kumar Biswas ◽  
Masud Rana ◽  
Anindya Malas ◽  
Sandipan Roy ◽  
Subhomoy Chatterjee ◽  
...  
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Spinal Fusion ◽  
Disc Replacement ◽  
Disc Disease ◽  
Single Level ◽  
Surgical Methods ◽  
Flexion Extension ◽  
Vertebral Disc ◽  
Spinal Segments

Degenerative disc disease (DDD) in lumbar spine is one of the major musculoskeletal disorders that cause low back pain (LBP). The intervertebral disc structure and dynamics of the lumbar spine are significantly affected by lumbar DDD, leading to a reduced range of motion (ROM), muscle weakness and gradual degradation. Spinal fusion and inter-vertebral disc replacement prostheses are two major surgical methods used for treating lumbar DDD. The aim of this present study is to examine biomechanical impacts of single level (L3-L4 and L4-L5) and multi level (L3-L4-L5) inter-vertebral disc replacement in lumbar spine (L2-L5) and to compare the performance with intact spine. Finite element (FE) analysis has been used to compare the mobility and stress distribution of all the models for four physiological movements, namely flexion, extension, left and right lateral bending under 6, 8 and 10 Nm moments. Spinal fusion implants completely restrict the motion of the implanted segment and increase disc stress at the adjacent levels. In contrast to that, the results single level ADR models showed closer ROM and disc stress to natural model. At the spinal segments adjacent to the implantation, single level ADR shows lower chance of disc degeneration. However, significantly increased ROM was observed in case of double level ADR.

scholarly journals Simulation Study of Sensitivity Performance of MEMS Capacitive Bending Strain Sensor for Spinal Fusion Monitoring

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Muhammad Irsyad Abdul Mokti ◽  
Inzarulfaisham Abd Rahim
Keyword(s):  
Silicon Dioxide ◽  
Spinal Fusion ◽  
Strain Sensor ◽  
Electrode Gap ◽  
Microelectromechanical System ◽  
Bending Strain ◽  
Anchor Length ◽  
Cantilever Structure ◽  
Capacitive Strain ◽  
Sensitivity Performance

This study evaluates the sensitivity of microelectromechanical system (MEMS) capacitive bending strain sensor with a double layer cantilever designed to meet the requirements of spinal fusion monitoring. The cantilever structure of the sensor consists of two parallel substrate plates which constitute the electrodes, attached to an anchor made of silicon dioxide. The sensor was able to monitor bending strain value ranging from 0 to 1000 με. In order to evaluate the sensitivity of the sensor, parametric study was carried out by varying electrode gap, anchor length, and dielectric coverage between the electrodes. The nominal capacitive strain sensor for various applications has sensitivity ranging from 255 aF/μεto 0.0225 pF/με. An increase in the sensitivity was observed on reducing the electrode gap and the anchor length and increasing the dielectric coverage, resulting in a highest sensitivity value of 0.2513 pF/με. It was also observed that dielectric constant has a significant effect on the sensitivity behavior of the sensor.

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