Classification and Analysis of Scleral IOL Fixation Methods

2019 ◽  
Vol 30 (5) ◽  
pp. 49-54
Author(s):  
A.A. Kozhukhov ◽  
◽  
O.V. Unguryanov ◽  
A.D. Rumiantsev ◽  
◽  
...  
Keyword(s):  
Fixation Methods ◽  
Iol Fixation

Biomechanical Evaluation of a New Fixation Method for Stabilization of Sagittal Split Ramus Osteotomy After Mandibular Advancement

2021 ◽  
Vol 6 ◽  
pp. 247275122110192
Author(s):  
Karel Kuik ◽  
Jean Pierre T. F. Ho ◽  
Cornelis Klop ◽  
Maurits H. T. de Ruiter ◽  
Cornelis J. Kleverlaan ◽  
...  
Keyword(s):  
Hybrid Method ◽  
In Vitro Study ◽  
Mandibular Advancement ◽  
Fixation Method ◽  
Common Procedure ◽  
Sagittal Split Ramus Osteotomy ◽  
Fixation Methods ◽  
Biomechanical Evaluation ◽  
Monocortical Screws

Study Design: Biomechanical in vitro study. Mandibular advancement after sagittal split ramus osteotomy (SSRO) is a common procedure in orthognathic surgery. Several fixation methods are used for stabilization of SSRO. Objective: The aim of this study was to compare a new fixation method (gridplate) with more contemporary applied methods of fixation. Material and Methods: In this study, 50 polyurethane hemimandibles with a prefabricated SSRO were used as specimens. All hemimandibles were advanced by 8 mm and divided into 5 groups with different fixation methods: (A) one 4-hole miniplate with 4 monocortical screws; (B) two 4-hole miniplates with 8 monocortical screws; (C) one 4-hole miniplate with 4 monocortical screws and 1 bicortical screw in the retromolar area (hybrid method); (D) 3 bicortical screws in an inverted-L pattern; and (E) one 8-hole gridplate with 8 monocortical screws. Loads in newtons were recorded at displacements of the mandibular incisive edge at 1 mm, 3 mm and 5 mm. Results: Fixation with 3 bicortical screws and the gridplate presented the most stability, followed by two 4-hole miniplates. Fixation with the hybrid method or the single miniplate showed the least stability. Conclusion: According to the results of this study, the 8-hole gridplate design appears a sufficient fixation method regarding stabilization of SSRO with larger mandibular advancement.

scholarly journals 27-gauge trocar-assisted sutureless intraocular lens fixation

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Tatsuya Jujo ◽  
Jiro Kogo ◽  
Hiroki Sasaki ◽  
Reio Sekine ◽  
Keiji Sato ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Endothelial Cell ◽  
Cell Density ◽  
Intraocular Lens ◽  
Vitreous Hemorrhage ◽  
Corneal Endothelial Cell ◽  
Endothelial Cell Density ◽  
Corneal Endothelial Cell Density ◽  
The Mean ◽  
Iol Fixation

Abstract Backgrounds However there have been numerous investigations of intrascleral intraocular lens (IOL) fixation techniques, there is room for improvement in terms of simplifying complicated techniques and reducing the high levels of skill required. This study aimed to report a novel technique for sutureless intrascleral fixation of the IOL using retinal forceps with a 27-gauge trocar. Methods Nineteen eyes of 18 patients underwent intrascleral fixation of the IOL from July 2018 to September 2019 were enrolled in this study. A 27-gauge trocar formed 3-mm scleral tunnels positioned at 4 and 10 o’clock, 2 mm from the corneal limbus. We used a 3-piece IOL haptic grasped by a 27-gauge retinal forceps and pulled from the 27-gauge trocar. The IOL was fixed by making a flange. Main outcome measures were visual acuity, corneal endothelial cell density, IOL tilt, decentration, predicted error of refraction and complications. Results The 19 eyes were followed up for 1 month. The mean pre- and postoperative logMAR uncorrected visual acuity (UCVA) was 1.06 ± 0.63 and 0.40 ± 0.26, respectively (p < 0.01), while the mean pre- and postoperative logMAR best corrected visual acuity (BCVA) was 0.27 ± 0.51 and 0.06 ± 0.15, respectively (p = 0.09). The mean corneal endothelial cell density was 2406 ± 625 to 2004 ± 759 cells/mm2 at 1 month (p = 0.13). The mean IOL tilt was 3.52 ± 3.00°, and the mean IOL decentration was 0.39 ± 0.39 mm. There was no correlation among IOL tilt, decentration and BCVA (p > 0.05). The mean prediction error of the target refraction was − 0.03 ± 0.93 D. The complications were vitreous hemorrhage (3 eyes), hyphema (1 eye), IOP elevation (1 eye), iris capture of the IOL (1 eye) and hypotony (2 eyes). No IOL dislocation occurred. Conclusions IOL intrascleral fixation with a flange achieved good IOL fixation and visual outcome in the scleral tunnels created with the 27-gauge trocar.

PD-L1 Immunohistochemistry on Cell Block Preparations From Different Fixatives: A Pilot Study

2019 ◽  
Vol 152 (Supplement_1) ◽  
pp. S95-S95
Author(s):  
Victoria Costa ◽  
David Kim ◽  
Abha Goyal ◽  
Bing He ◽  
Yifang Liu ◽  
...  
Keyword(s):  
Pilot Study ◽  
Personalized Medicine ◽  
Cell Block ◽  
Fixation Methods ◽  
Tonsillar Tissue ◽  
Fixed Cell ◽  
Specific Fixation ◽  
Formalin Fixed

Abstract Objectives Immunohistochemistry especially for biomarkers such as PD-L1 in personalized medicine is increasingly being performed on cell blocks from cytopathology samples. We evaluated the effects of staining cell blocks (CBs) from different cytologic fixatives using four different commercially available PD-L1 antibody clones. Methods PD-L1 immunohistochemistry (IHC) using four different commercially available clones was performed on eight cell blocks processed from two different fixatives and also on eight formalin-fixed tissues. The clones used were 22C3 at 1:50 dilution and 1:100 dilution, SP263, SP142, and E1L3N. The cell block (CB) samples contained cells that strongly express PD-L1 and either fixed in CytoLyt (methanol-based fixative, n = 4) or CytoRich (ethanol-formalin-based fixative, n = 4). Formalin-fixed control tissues (tonsillar tissue, n = 4; stomach, n = 4) were also included. Results Expression for PD-L1 was noted on all the CytoRich fixed cell blocks (n = 4) for all four antibody clones, with the intensity and distribution of expression comparable to the formalin fixed tissues (n = 8). However, consistent absence of expression for PD-L1 was noted on all the CytoLyt fixed cell blocks (n = 4) for all four antibody clones. Conclusion The results of this pilot study demonstrate that PD-L1 IHC on cell blocks is feasible. However, there is a need to validate IHC protocols according to specific fixation methods.

scholarly journals Comparison of three fixation methods for orotracheal intubation in 95 adults

2020 ◽  
Vol 25 (1) ◽  
Author(s):  
Ye Sun ◽  
Hua Fan ◽  
Xiao-Xia Song ◽  
Hua Zhang
Keyword(s):  
Intensive Care Unit ◽  
Intensive Care ◽  
Tracheal Intubation ◽  
Older People ◽  
Endotracheal Intubation ◽  
Orotracheal Intubation ◽  
The Other ◽  
Fixation Methods ◽  
The Difference

Abstract Background The present study aimed to compare three fixation methods for orotracheal intubation. Methods Through literature retrieval, the effects of the adhesive/twill tape method, fixator method, and adhesive/twill tape–fixator alternation method on patients with tracheal intubation in the intensive care unit (ICU) were compared. Results The fixator and alternation methods were more effective in protecting the tongue mucosa and teeth. The alternation method was superior to the other two methods in maintaining the position of the endotracheal intubation. However, the difference in facial and lip injuries between the three methods was not statistically significant. Conclusion The fixator method can significantly reduce intraoral injury and is more suitable for older people with weak tongue mucosa and loose teeth. These are worth popularizing among a wider group.

Arthroscopic Biceps Tenodesis: Technique and Results in Six Dogs

2005 ◽  
Vol 41 (2) ◽  
pp. 121-127 ◽  
Author(s):  
James L. Cook ◽  
Keith Kenter ◽  
Derek B. Fox
Keyword(s):  
Surgical Management ◽  
Biceps Tendon ◽  
Interference Screw ◽  
Cannulated Screw ◽  
Biceps Tenodesis ◽  
Fixation Methods ◽  
Feasible Option ◽  
Successful Outcomes ◽  
Tendon Pathology

Biceps tenodesis was performed using an arthroscopic-assisted technique on six dogs diagnosed with chronic bicipital tendon pathology. The technique was performed using two different fixation methods (i.e., cannulated interference screw, cannulated screw and tissue washer). All six dogs had successful outcomes in terms of return to full function at a mean follow-up time of 11.7 months after surgery. Arthroscopic biceps tenodesis is a feasible option for surgical management of biceps tendon pathology, and it may have advantages over open tenodesis and open or arthroscopic tenotomy. Further study is needed before definitive recommendations regarding indications, complications, and prognosis associated with arthroscopic biceps tenodesis can be made.

scholarly journals Biomechanical assessment of different fixation methods in mandibular high sagittal oblique osteotomy using a three-dimensional finite element analysis model

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Charles Savoldelli ◽  
Elodie Ehrmann ◽  
Yannick Tillier
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Von Mises Stress ◽  
Analysis Model ◽  
Element Analysis ◽  
Fixation Methods ◽  
Oblique Osteotomy ◽  
Von Mises

AbstractWith modern-day technical advances, high sagittal oblique osteotomy (HSOO) of the mandible was recently described as an alternative to bilateral sagittal split osteotomy for the correction of mandibular skeletal deformities. However, neither in vitro nor numerical biomechanical assessments have evaluated the performance of fixation methods in HSOO. The aim of this study was to compare the biomechanical characteristics and stress distribution in bone and osteosynthesis fixations when using different designs and placing configurations, in order to determine a favourable plating method. We established two finite element models of HSOO with advancement (T1) and set-back (T2) movements of the mandible. Six different configurations of fixation of the ramus, progressively loaded by a constant force, were assessed for each model. The von Mises stress distribution in fixations and in bone, and bony segment displacement, were analysed. The lowest mechanical stresses and minimal gradient of displacement between the proximal and distal bony segments were detected in the combined one-third anterior- and posterior-positioned double mini-plate T1 and T2 models. This suggests that the appropriate method to correct mandibular deformities in HSOO surgery is with use of double mini-plates positioned in the anterior one-third and posterior one-third between the bony segments of the ramus.

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