scholarly journals Investigation of the effects of spinal surgical implants on radiotherapy dosimetry: A study of 3D printed phantoms

2021 ◽  
Author(s):  
Simon K Goodall ◽  
Peter Rampant ◽  
Warwick Smith ◽  
David Waterhouse ◽  
Pejman Rowshanfarzad ◽  
...  
Keyword(s):  
Surgical Implants ◽  
3D Printed ◽  
Radiotherapy Dosimetry

scholarly journals Challenges in the design and regulatory approval of 3D-printed surgical implants: a two-case series

2019 ◽  
Vol 1 (4) ◽  
pp. e163-e171 ◽  
Author(s):  
Koen Willemsen ◽  
Razmara Nizak ◽  
Herke Jan Noordmans ◽  
René M Castelein ◽  
Harrie Weinans ◽  
...  
Keyword(s):  
Case Series ◽  
Regulatory Approval ◽  
Surgical Implants ◽  
3D Printed

scholarly journals Mechanical Comparison of 3D-Printed Plates and Screws for Open Reduction and Internal Fixation of Fractures

2020 ◽  
Vol 8 (7_suppl6) ◽  
pp. 2325967120S0038
Author(s):  
Connor Lough ◽  
Will Bezold ◽  
Kevin Feltgz ◽  
Kevin Middleton ◽  
Nathan Skelley ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Significant Interaction ◽  
Standard Of Care ◽  
Torsional Loading ◽  
Pull Out ◽  
Surgical Implants ◽  
Flat Design ◽  
3D Printers ◽  
3D Printed ◽  
Point Bend

Objectives: Three-dimensional (3D) printing has emerged as a promising technology in the field of orthopaedic surgery. The purpose of this study was to evaluate the mechanical properties of 3D printed 1/3 tubular plates and cortical screws compared to standard-of-care stainless steel 1/3 tubular plates and cortical screws. Methods: Replication and modification designs were developed for both plates and screws using open-source computer-assisted design (CAD) software. Models were printed in four materials: acrylonitrile butadiene styrene (ABS), carbon fiber reinforced polylactic acid (PLA), polycarbonate (PC), and polyether ether ketone (PEEK). The implants (Figure 1) were tested and compared to surgical steel plates and screws. Plates were tested with three-point bend and torsional loading using an Instron® material testing machine. Screws were analyzed on pull-out strength in a Sawbones® bone model, shear strength, and torsional loading. Each combination of design and material was placed in its own test group with a sample size (n = 5) and compared to a steel control group (n = 5) for each mechanical test. Results: Significant interaction effects between material type and design type were observed for screw shear (p = 0.003), screw torque (p = 0.023), plate 3-point bend (p = 0.002), and plate torque (p = 0.001). A significant interaction effect was not observed for screw pull-out (p = 0.407), however, a statistically significant difference in mean force between material types (p <0.0005) was observed.Screw Shear: The highest mean force when both material and design were considered was for the CFPLA modified flat design with a mean force of 105.83 N (95% CI 88.51 to 123.14).Screw Torque: The highest mean force when both material and design were considered was for the PEEK modified tilt design with a mean force of 49.51 Ncm (95% CI 43.40 to 55.63).Plate 3-Point Bend: The highest mean force when both material and design were considered was for the PEEK modification design with a mean force of 31.93 N (95% CI 30.53 to 33.33).Plate Torque: The highest mean force when both material and design were considered was for the CFPLA modified flat design with a mean force of 46.88 Ncm (95% CI 42.95 to 50.80).Screw Pull-Out: Mean force produced was highest for PC across all test groups (Figure 2) with a total mean force of 211.86 N (95% CI 186.81 to 236.90). Conclusion: This study demonstrates that desktop 3D printers are capable of printing biocompatible materials that can replicate surgical implants. Although the current materials have significant mechanical variability, they do not approximate the properties of stainless steel. The utility of 3D printed surgical implants for internal fracture fixation provides a potential clinical application in locations where equipment is not as readily available, such as developing countries, forward operating military units, or long duration space flight missions. Furthermore, the cost for 3D printers and 3D printable materials has significantly decreased over recent years. This increase in technology and associated decrease in costs, along with numerous open-source 3D modeling software programs, could provide a low-cost alternative to more expensive and less accessible standard-of-care stainless-steel implants. [Figure: see text]

scholarly journals Biological Cell Investigation of Structured Nitinol Surfaces for the Functionalization of Implants

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3264
Author(s):  
Isabell Hamann ◽  
Ute Hempel ◽  
Christian Rotsch ◽  
Mario Leimert
Keyword(s):  
Metabolic Activity ◽  
Stromal Cells ◽  
Primary Stability ◽  
Marrow Stromal Cells ◽  
Surface Structures ◽  
Ultrashort Pulse Laser ◽  
Surgical Implants ◽  
Laser Beam Melting ◽  
3D Printed ◽  
Manufacturing Technologies

Expandable implants including shape memory alloy (SMA) elements have great potential to minimize the risk of implant loosening and to increase the primary stability of bone anchoring. Surface structuring of such elements may further improve these properties and support osteointegration and bone healing. In this given study, SMA sheets were processed by deploying additive and removal manufacturing technologies for 3D-printed surgical implants. The additive technology was realized by applying a new laser beam melting technology to print titanium structures on the SMA sheets. The removal step was realized as a standard process with an ultrashort-pulse laser. The morphology, metabolic activity, and mineralization patterns of human bone marrow stromal cells were examined to evaluate the biocompatibility of the new surface structures. It was shown that both surface structures support cell adhesion and the formation of a cytoskeleton. The examination of the metabolic activity of the marrow stromal cells on the samples showed that the number of cells on the laser-structured samples was lower when compared to the 3D-printed ones. The calcium phosphate accumulation, which was used to examine the mineralization of marrow stromal cells, was higher in the laser-structured samples than in the 3D-printed ones. These results indicate that the additive- and laser-structured SAM sheets seem biocompatible and that the macrostructure surface and manufacturing technology may have positive influences on the behavior of the bone formation. The use of the new additive technique and the resulting macrostructures seems to be a promising approach to combine increased anchorage stability with simultaneously enhanced osteointegration.

3D Printed Models for Surgical Planning and Reconstructive Implant Design in Sphenoorbital Tumor Surgery

2016 ◽  
Vol 77 (S 02) ◽  
Author(s):  
Hassan Othman ◽  
Sam Evans ◽  
Daniel Morris ◽  
Saty Bhatia ◽  
Caroline Hayhurst
Keyword(s):  
Surgical Planning ◽  
Implant Design ◽  
Tumor Surgery ◽  
3D Printed

That which Is Unseen: A 3D-Printed Case-Based Didactic Approach to Teaching Pediatric Cerebrovascular Neurosurgery

2019 ◽  
Author(s):  
Avital Perry ◽  
Soliman Oushy ◽  
Lucas Carlstrom ◽  
Christopher Graffeo ◽  
David Daniels ◽  
...  
Keyword(s):  
3D Printed ◽  
Approach To Teaching ◽  
Case Based

Bioresorption and biodegradation of the 3D-printed gene-activated bone substitutes based on octacalcium phosphate

2020 ◽  
Vol XV (1) ◽  
Author(s):  
E. Presnyakov ◽  
I. Bozo ◽  
I. Smirnov ◽  
V. Komlev ◽  
V. Popov ◽  
...  
Keyword(s):  
Bone Substitutes ◽  
Octacalcium Phosphate ◽  
3D Printed
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