scholarly journals Error Analysis and Experimental Study of a Bi-Planar Parallel Mechanism in a Pedicle Screw Robot System

Sensors ◽  
2016 ◽  
Vol 16 (12) ◽  
pp. 2022 ◽  
Author(s):  
Qingjuan Duan ◽  
Zhijiang Du ◽  
Hongjian Yu ◽  
Yongfeng Wang ◽  
Wei Dong
Keyword(s):  
Experimental Study ◽  
Error Analysis ◽  
Pedicle Screw ◽  
Parallel Mechanism ◽  
Robot System

Rotational Compliance Measurements of a Flexible Plane Structure Using an Attached Beam-like Tip, Part 2: Experimental Study

1997 ◽  
Vol 119 (4) ◽  
pp. 603-608 ◽  
Author(s):  
Y. C. Qu ◽  
L. Cheng ◽  
D. Rancourt
Keyword(s):  
Experimental Study ◽  
Error Analysis ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Companion Paper ◽  
Experimental Measurements ◽  
Frequency Range ◽  
Experimental Assessment ◽  
Different Types ◽  
Modal Behavior

This paper presents an experimental assessment of the Tip Excitation Technique (TET) introduced in a companion paper. The aim of the technique is to measure the rotational compliance of attached plane structures. Following the guidelines established on the basis of a numerical study in the companion paper, experimental measurements were performed on a rectangular plate and results were compared with numerical simulations. The investigation focuses on the general performance of the technique, on the different types of excitation used and on other factors necessary to ensure accurate results. In addition, an error analysis is conducted to demonstrate the sensitivity of the results to biased measurement quantities. It is concluded that the proposed technique can be used in the low to middle frequency range, where relatively strong modal behavior is involved.

scholarly journals Collaborative spinal robot system for laminectomy: a preliminary study

2022 ◽  
Vol 52 (1) ◽  
pp. E11
Keyword(s):  
Pedicle Screw ◽  
Screw Placement ◽  
Great Success ◽  
Pedicle Screw Placement ◽  
Robot Assisted ◽  
Robot System ◽  
Significant Difference ◽  
Time Required ◽  
The Right

OBJECTIVE The application of robots in the field of pedicle screw placement has achieved great success. However, decompressive laminectomy, a step that is just as critical as pedicle screw placement, does not have a mature robot-assisted system. To address this lack, the authors designed a collaborative spine robot system to assist with laminectomy. In this study, they aimed to investigate the reliability of this novel collaborative spinal robot system and compare it with manual laminectomy (ML). METHODS Thirty in vitro porcine lumbar vertebral specimens were obtained as experimental bone specimens. Robot-assisted laminectomy (RAL) was performed on the left side of the lamina (n = 30) and ML was performed on the right side (n = 30). The time required for laminectomy on one side, whether the lamina was penetrated, and the remaining thickness of the lamina were compared between the two groups. RESULTS The time required for laminectomy on one side was longer in the RAL group than in the ML group (median 326 seconds [IQR 133 seconds] vs 108.5 seconds [IQR 43 seconds], p < 0.001). In the RAL group, complete lamina penetration occurred twice (6.7%), while in the ML group, it occurred 9 times (30%); the difference was statistically significant (p = 0.045). There was no statistically significant difference in the remaining lamina thickness between the two groups (median 1.035 mm [IQR 0.419 mm] vs 1.084 mm [IQR 0.383 mm], p = 0.842). CONCLUSIONS The results of this study confirm the safety of this novel spinal robot system for laminectomy. However, its efficiency requires further improvement.

An Experimental Study for Algorithm of Finding for Resident-Tracking Robot System

2020 ◽  
Author(s):  
Masashi SUGIMOTO ◽  
Ryunosuke UCHIDA ◽  
Shinji TSUZUKI ◽  
Masatsugu HIRANO ◽  
Takashi YOSHIOKA ◽  
...  
Keyword(s):  
Experimental Study ◽  
Robot System

An Experimental Study for Establishing an Optimal Pedicle Screw Design According to Bone Mineral Density

2020 ◽  
Vol 44 (8) ◽  
pp. 519-526
Author(s):  
Chan-Hee Song ◽  
Tae Sik Goh ◽  
Jung Sub Lee ◽  
Eun Sun Lee ◽  
Jin-Young Heo ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Experimental Study ◽  
Pedicle Screw ◽  
Bone Mineral ◽  
Mineral Density ◽  
Screw Design

An experimental study on the direct & indirect dynamic identification of an over-constrained 3-DOF decoupled parallel mechanism

2017 ◽  
Vol 116 ◽  
pp. 178-202 ◽  
Author(s):  
Mohammad Sharifzadeh ◽  
Alaleh Arian ◽  
Amir Salimi ◽  
Mehdi Tale Masouleh ◽  
Ahmad Kalhor
Keyword(s):  
Experimental Study ◽  
Parallel Mechanism ◽  
Dynamic Identification

scholarly journals Biomechanical Comparison of Pedicle Screw Augmented with Different Volumes of Polymethylmethacrylate in Osteoporotic and Severely Osteoporotic Synthetic Bone Blocks in Primary Implantation: An Experimental Study

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Da Liu ◽  
Xiao-jun Zhang ◽  
Dong-fa Liao ◽  
Jiang-jun Zhou ◽  
Zhi-qiang Li ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pedicle Screw ◽  
Severe Osteoporosis ◽  
Synthetic Bone ◽  
Pullout Tests ◽  
Positive Correlations ◽  
Biomechanical Comparison ◽  
Bone Condition ◽  
Primary Implantation ◽  
Optimum Volume

This study was designed to compare screw stabilities augmented with different volumes of PMMA and analyze relationship between screw stability and volume of PMMA and optimum volume of PMMA in different bone condition. Osteoporotic and severely osteoporotic synthetic bone blocks were divided into groups A0-A5 and B0-B5, respectively. Different volumes of PMMA were injected in groups A0 to A5 and B0 to B5. Axial pullout tests were performed andFmaxwas measured.Fmaxin groups A1-A5 were all significantly higher than group A0. Except between groups A1 and A2, A3 and A4, and A4 and A5, there were significant differences onFmaxbetween any other two groups.Fmaxin groups B1-B5 were all significantly higher than group B0. Except between groups B1 and B2, B2 and B3, and B4 and B5, there were significant differences onFmaxbetween any other two groups. There was significantly positive correlation betweenFmaxand volume of PMMA in osteoporotic and severely osteoporotic blocks. PMMA can significantly enhance pedicle screw stability in osteoporosis and severe osteoporosis. There were positive correlations between screw stability and volume of PMMA. In this study, injection of 3 mL and 4 mL PMMA was preferred in osteoporotic and severely osteoporotic blocks, respectively.

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