scholarly journals A microwave termoablációs (MWA) módszer bevezetése az aranyeresség sebészetébe

2021 ◽  
Vol 74 (2) ◽  
pp. 37-42
Author(s):  
István Rozsos ◽  
Gergely Vadász ◽  
Melinda Gadácsi
Keyword(s):  
Thermal Treatment ◽  
Microwave Devices ◽  
Treatment Methods ◽  
Complete Cure ◽  
Safety Requirements ◽  
New Methods ◽  
Significant Difference ◽  
Surgical Options

Összefoglaló. Célkitűzés: A már több mint egy évtizede alkalmazott lézeres aranyérműtét technikai tapasztalatai alapján kidolgozott mikrohullámú termo-koagulációs műtét bevezetésének korai eredményeinek bemutatása. Közleményünkben a lézeres és microwave elven működő eszközökkel végzett aranyérműtéti eredményeinket mutatjuk be. Betegek és módszerek: A 26 lézerszállal és a 14 mikrohullámú merev antennával végzett műtét összehasonlítását végeztük el. Eredmények: Mindkét csoportban az átlagos panaszmentesség 2 hét alatt alakult ki, a két módszer között jelentős különbséget nem találtunk. Megbeszélés: Az új műtéti eljárásokat kereső világunkban az általunk most kipróbált lehetőség lehetővé teszi a gyors és teljes gyógyulást adó kezelést. A termo elven működő rendszerek kevesebb fizikai roncsolással érik el a kívánt hatást. A microwave technika a lézeres beavatkozások biztonsági előírásainak szükségessége és körülményessége nélkül alkalmazható. Summary. Abstract: In addition to the traditional surgical options for hemorrhoid disease, newer treatment methods are evolving along the principle of reducing the burden on patients and providing similar or better healing. Thermo-based systems achieve the desired effect with less physical destruction. In this paper, we discuss the results of hemorrhoid surgery performed with laser and microwave devices. Patients and methods: We compare the results of 26 operations done with laser fibers and 14 operations using microwave rigid antennas. Results: In both groups, the average complaint-free period developed within 2 weeks, no significant difference was found between the two methods. Discussion: As we are always looking for new methods and surgical solutions, an option we are testing now indicates that thermal treatment can provide a quick and complete cure without the need for complicated safety requirements of laser interventions.

scholarly journals Influence of the Thermal Treatment to Address a Better Osseointegration of Ti6Al4V Dental Implants: Histological and Histomorphometrical Study in a Rabbit Model

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Antonio Scarano ◽  
Ezio Crocetta ◽  
Alessandro Quaranta ◽  
Felice Lorusso
Keyword(s):  
Thermal Treatment ◽  
Dental Implants ◽  
Bone Healing ◽  
Rabbit Model ◽  
Titanium Implants ◽  
Control Group ◽  
Left Femur ◽  
Bone Response ◽  
First Choice ◽  
Significant Difference

Background. Pure titanium continues to be the first choice for dental implants and represents the gold standard for their biocompatibility and physical and mechanical characteristics, while the titanium alloy (Ti6Al4V) has good mechanical properties. The surface structure of the titanium oxide layer formation on the surface influences and improves the bone response around dental implants. Purpose. The purpose of this study is to evaluate the influence of a thermal treatment of Ti6Al4V implant surfaces and the bone healing response in a rabbit model. Methods. Altogether sixteen implants with same design were inserted into the distal femoral metaphysis. A screw (13 mm long, 4 mm in diameter) was inserted in an implant bed. Each rabbit received two implants, one in the left femur and one in the right femur. The samples were histologically and histomorphometrically evaluated at 8 weeks. Results. A statistically significant difference (p = 0.000034) was present histologically in the percentages of bone-implant contact (BIC) between the test group (BIC = 69.25±4.49%.) and control group (BIC = 56.25 ± 4.8%) by one-way analysis of variance (ANOVA). Significance was set at p ≤ 0.05. Conclusions. The outcome of the present study indicates a novel approach to improving bone healing around titanium implants.

Performance changes of venous valves following tissue treatment with novel in vitro system

2018 ◽  
Vol 34 (5) ◽  
pp. 347-354
Author(s):  
Garrett Easson ◽  
Megan Laughlin ◽  
Hanna Jensen ◽  
Kevin Haney ◽  
Marc Girardot ◽  
...  
Keyword(s):  
High Speed ◽  
In Vitro Model ◽  
Closing Time ◽  
Venous Valve ◽  
Orifice Area ◽  
Treatment Methods ◽  
Venous Valves ◽  
Significant Difference ◽  
Vitro Model

Objectives The purpose of this study is to test venous valve performance and identify differences between native tissue and replacement devices developed with traditional tissue treatment methods using a new in vitro model with synchronized hemodynamic parameters and high-speed valve image acquisition. Methods An in vitro model mimicking the venous circulation to test valve performance was developed using hydrostatic pressure driven flow. Fresh and glutaraldehyde-treated vein segments were placed in the setup and opening/closing of the valves was captured by a high-speed camera. Hemodynamic data were obtained using synchronized hardware and virtual instrumentation. Results Geometric orifice area and opening/closing time of the valves was evaluated at the same hemodynamic conditions. A reduction in geometric orifice area of 27.2  ± 14.8% (p < 0.05) was observed following glutaraldehyde fixation. No significant difference in opening/closing time following chemical fixation was observed. Conclusions The developed in vitro model was shown to be an effective method for measuring the performance of venous valves. The observed decrease in geometric orifice area following glutaraldehyde treatment indicates a decrease in flow through the valve, demonstrating the consequences of traditional tissue treatment methods.

scholarly journals Using a smartphone video camera to reduce anxiety in speaking activity

2021 ◽  
Vol 12 (1) ◽  
pp. 38-55
Author(s):  
Nur Asma
Keyword(s):  
Smartphone Application ◽  
Video Camera ◽  
New Methods ◽  
Self Confidence ◽  
Significant Difference ◽  
English Speaking ◽  
The Common ◽  
Common Problems ◽  
And Control ◽  
Relevant Factors

The common problems faced by students in English speaking are anxiety and the lack of confidence and ideas. This research was conducted to determine the relevant factors and to provide a solution by using the smartphone video camera. To obtain the data in this research, experimental research was performed inside and outside the classroom with a series of treatments and a questionnaire sheet as the instrument. The data were analyzed using a model proposed by Smeda, Dakich, and Sharda (2014) and a Likert scale questionnaire, which was adapted from Spratt, Humphreys, and Chan (2002). The result from the test showed a significant difference between the experimental and control classes as the carried t-test presented the score of -8.36, which was out of the limit (between -1.96 and 1.96). Another result was the students developed positively which was shown by: the anxiety tends to decrease as they were given time before performing thus prepared better, their self-confidence was increased and challenged by using the smartphone video camera method due to the application of innovation in the speaking class. The conclusion of this research is lecturer needs to apply new methods, one of which is using a smartphone application.

Titanium and Ti-13Nb-13Zr Alloy Porous Implants Obtained by Space-Holder Technique with Addition of Albumin

2012 ◽  
Vol 529-530 ◽  
pp. 574-579
Author(s):  
Tamiye Simone Goia ◽  
Kalan Bastos Violin ◽  
José Carlos Bressiani ◽  
Ana Helena de Almeida Bressiani
Keyword(s):  
Thermal Treatment ◽  
Surface Characterization ◽  
High Vacuum ◽  
Pure Titanium ◽  
Vacuum Furnace ◽  
Metal Powders ◽  
Space Holder ◽  
Significant Difference ◽  
13Zr Alloy ◽  
Hydride Titanium

Titanium and its alloys are the main metals studied as porous metallic implants by their excellent mechanical properties and biological interactions. Production methods of porous metallic materials are based on powder metallurgy (PM), because it allows the manufacturing of parts with complex shapes and dimensions close to the finals (near-net shape), and the addition of alloying elements reaching a satisfactory structural homogeneity, and porosity. The pore production by space-holder technique constitutes of mixing organic compounds with metal powder, which when removed by thermal treatment prior structures are kept in place. The objective of this study is to obtain porous implants of commercially pure titanium (cpTi) and Ti-13Nb-13Zr alloy by PM with space-holder technique and albumin as an additive. For the processing of the samples were used hydride titanium powder (TiH2) to obtain cpTi samples, and metal powders of Ti, Nb and Zr in the stoichiometric proportions for obtaining the alloy samples. The samples were prepared by mixing the metallic powder to the albumin (30wt%) and filling a silicone model that was pressed isostatically (140 MPa). The thermal treatment was performed in an oxidizing atmosphere (350°C/1h) for the decomposition of organic material. The sintering was performed at a temperature of 1300°C (1h/cpTi, 3h/Alloy) in high vacuum furnace (10-5 mBar) to all samples. The calculated porosity showed a significant difference between the samples cpTi (40%) and alloy (60%). The samples surface characterization showed very rough with high specific surface area. Samples of cpTi presented formation of necks arising from sintering. In the alloy samples were observed homogenous microstructure with the presence of α and β phases composing the Widmanstätten structure. It is possible to conclude that the same amount albumin allowed the formation of pores in the microstructure of cpTi and alloy although in different proportions, without harming the sintering of both and allowing diffusion of the alloy elements.

Effects of Different Thermal Treatment Methods on Preparation and Physical Properties of High Amylose Maize Starch Based Films

2018 ◽  
Vol 14 (4) ◽  
Author(s):  
Yuyue Zhong ◽  
Xu Li ◽  
Tianru Lan ◽  
Yibo Li ◽  
Linsan Liu ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Physical Properties ◽  
Raw Material ◽  
Maize Starch ◽  
Solubility In Water ◽  
Treatment Methods ◽  
Starch Films ◽  
The Difference ◽  
High Amylose ◽  
Water Holding

AbstractBecause of its biodegradable trait, starch has been widely used as the raw material for packaging. Effects of different thermal treatment methods (high temperature-high pressure heating (HH), microwave heating (MH) and alkali heating (AH) with and without glycerol on physical properties of high amylose maize starch films (HASFs) were investigated in this study. HASFs under HH had highest elongation at break (E%), and lowest tensile strength (TS), modulus of elasticity (EM) and opacity (OC). HASFs under MH had highest TS, water holding capacity (WHC) and OC, and lowest thickness (TN), E%, solubility in water (SW) and solubility in oil (SO), while HASFs under AH had highest TN, EM, SW and SO, and lowest WHC. Compared with water, plasticized HASFs with glycerol had higher TN，E%, WHC, SW and OC, and lower TS, EM and SO. XRD results revealed the V-type polymorph and the difference in intensity of diffraction peaks of HASFs under three methods. This study would be helpful to design and prepare HASFs.

scholarly journals Effect of the Short-Segment Internal Fixation with Intermediate Inclined-Angle polyaxial Screw at the Fractured Vertebra on the Treatment of Denis type B Thoracolumbar Fracture

2020 ◽  
Author(s):  
chengjie xiong ◽  
Biwang Huang ◽  
Tanjun Wei ◽  
Hui Kang ◽  
Feng Xu
Keyword(s):  
Internal Fixation ◽  
Vertebral Body ◽  
Body Height ◽  
Type B ◽  
Short Segment ◽  
Average Value ◽  
Significant Difference ◽  
Surgical Options ◽  
Inclined Angle ◽  
Duration Of Operation

Abstract Background: Short-segment internal fixation with intermediate straight-forward monoaxial screws (SSIF-SFM) and long-segment internal fixation (LSIF) are the tow major surgical options for thoracolumbar (TL) fracture. However, SS IF-SFM might not provide adequate support to the spine and LSIF is un necessarily extensive. SSIF with intermediate inclined-angle polyxial screw (SSIF-IAP) might offer an alternative solution for the treatment of TL fracture. Methods: A retrospective study was conducted. 69 patients (47 males and 22 females; average 34.5 years) with Denis type B TL fracture who met the criteria for inclusion were enrolled. Sagittal Cobb’s angle (SCA), anterior vertebral body height (AVBH), vertebral body index (VBI) and spinal canal encroachment (SCE) were measured and assessed. Visual analogue scale (VAS) and oswestry disability index (ODI) were also evaluated. Results: The average value of incision length, blood loss, duration of operation and hospital stay in the SSIF–IAP group and SSIF-SFM group were significantly decreased compared with those in the LSIF group. The AVBH and VBI in the SSIF-IAP group and LSIF group were significantly improved than those in the SSIF–SFM group at 6-month and the latest follow-ups (p < 0.05). The correction losses of AVBH and VBI (calculated by the reduction of AVBH and VBI) in the SSIF-IAP group and LSIF group were also significantly decreased compared with those in the SSIF–SFM group at 6-month and the latest follow-ups (P < 0.05). There was no significant difference of SCE among the three groups postoperatively. The VAS and ODI in the SSIF-IAP group and SSIF-SFM group were significantly decreased compared with those in the LSIF group at 6-month and the latest follow-ups (P < 0.05). Conclusion: Both SSIF- IAP and LSIF can improve the biomechanical stability as compared with SSIF -SFM . Moreover, SSIF-IAP was an effective and reliable operative technique for patients with Denis type B TL fracture.

scholarly journals Effect of the Short-Segment Internal Fixation with Intermediate Inclined-Angle polyaxial Screw at the Fractured Vertebrae on the Treatment of Denis type B Thoracolumbar Fracture

2020 ◽  
Author(s):  
Chengjie Xiong ◽  
Biwang Huang ◽  
Tanjun Wei ◽  
Hui Kang ◽  
Feng Xu
Keyword(s):  
Internal Fixation ◽  
Vertebral Body ◽  
Body Height ◽  
Type B ◽  
Short Segment ◽  
Significant Difference ◽  
Surgical Options ◽  
Cobb’S Angle ◽  
Inclined Angle ◽  
Duration Of Operation

Abstract Backgroud Short-segment internal fixation with straight-forward monoaxial screw (SSIF-SFM) and long-segment internal fixation (LSIF) are two major surgical options for thoracolumbar (TL) fracture, however, limitations of both surgical options l are obvious. SSIF with inclined-angle polyxial screw (SSIF-IAP) have been developed to take advantage of their benefits and minimize their adverse effects . Methods 69 consecutive patients (47 males and 22 females; average 34.5 years ) who met the criteria for inclusion were enrolled in this study . Sagittal Cobb’s angle (SCA), anterior vertebral body height (AVBH), vertebral body index (VBI) and spinal canal encroachment (SCE) were measured and assessed . Functional recovery Visual Analogue Scale (VAS) and Oswestry disability index (ODI) were also evaluated. Results The value of incision length, mean blood loss, duration of operation and hospital stay in the SSIF–IAP group and SSIF-SFM group were significantly lower than those in the LSIF group. The AVBH and VBI in the SSIF–IA P group and LSIF group were significantly more improved than those in the SSIF–SFM group at 6 months and the latest follow-ups (p < 0.05). The correction losses of AVBH and VBI ( calculated by the reduction of AVBH and VBI) in the SSIF-IAP group and LSIF group were also significantly lower than those in the SSIF–SFM group at 6 months and the latest follow-ups (P<0.05). There was no significant difference of SCE among three groups. The VAS and ODI in the SSIF–IAP group and SSIF-SFM group were significantly lower than those in the LSIF group at 6 months and the latest follow-ups (P<0.05). Conclusion SSIF-IAP can achieve comparable treatment outcomes compared with LSIF, but it was less invasive compared with LSIF . The SSIF–IA was an effective and reliable operative technique for patients with Denis type B TL fracture.

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