Dynamic Electrical Impedance in Bipolar Tissue Welding

2017 ◽  
Author(s):  
Xiaoran Li ◽  
Russell Borduin ◽  
Roland Chen ◽  
Wei Li
Keyword(s):  
Dynamic Behavior ◽  
Electrical Impedance ◽  
Wound Closure ◽  
Minimal Invasive Surgery ◽  
Welding Process ◽  
Minimal Invasive ◽  
Medical Procedures ◽  
Tissue Welding ◽  
Vessel Sealing ◽  
Joining Process

Bipolar tissue welding is a material joining process where high frequency alternating current is applied to biological tissue in medical procedures such as wound closure and blood vessel sealing. The process is often performed with a set of laparoscopic forceps in a minimal invasive surgery to achieve less bleeding and shorter recovery time. However, problems such as tissue sticking, thermal damage, and joint failure often occur and need to be solved before the process can be reliably used in more surgical procedures. In this study, experiments were conducted to investigate dynamic behavior of the tissue welding process through electrical impedance measurements. Both scissor-type and parallel electrodes were used with various compression and power settings in the experiment. It was found that the electrical impedance of tissue was lower when parallel electrodes were used. It can be used to understand the results and dynamic behavior of the tissue welding process, including the size of heat affected zone, tissue sticking, and the compression force effect.

Effects of Compression Force and Heating Power on Bipolar Tissue Welding

2018 ◽  
Author(s):  
Xiaoran Li ◽  
Roland K. Chen ◽  
Wei Li
Keyword(s):  
Thermal Damage ◽  
Minimal Invasive Surgery ◽  
Minimal Invasive ◽  
Heating Power ◽  
Process Conditions ◽  
Tissue Welding ◽  
Dynamic Impedance ◽  
Tissue Zone ◽  
Compression Level ◽  
Suitable Process

Bipolar tissue welding is often performed with a set of laparoscopic forceps in a minimal invasive surgery to achieve less bleeding and shorter recovery time. However, problems such as tissue sticking, thermal damage, and joint failure need to be solved before the process can be reliably used in more surgical procedures. In this study, experiments were conducted to examine the effect of process parameters and dynamic impedance for prediction of the size of denatured tissue zone during welding. A weld lobe that defines suitable process conditions was constructed. It is found that tissue denaturation starts from the center of the heated region. Dynamic impedance is strongly affected by the compression level and heating power. The size of denatured tissue zone can be predicted with the heating energy; however, the prediction is strongly dependent on the compression level.

Minimal invasive surgery for intracardiac tumors – report of 19 consecutive patients

2010 ◽  
Vol 58 (S 01) ◽  
Author(s):  
T Bossert ◽  
P Krieg ◽  
T Sandhaus ◽  
P Kley-Madaus ◽  
K Hekmat
Keyword(s):  
Invasive Surgery ◽  
Minimal Invasive Surgery ◽  
Minimal Invasive ◽  
Intracardiac Tumors

Metodología para el desarrollo de trayectorias en la aplicación por el proceso de soldadura GMAW en un robot industrial

2019 ◽  
pp. 1-4
Author(s):  
Josué Rafael Sánchez-Lerma ◽  
Luis Armando Torres-Rico ◽  
Héctor Huerta-Gámez ◽  
Ismael Ruiz-López
Keyword(s):  
Mechanical Properties ◽  
Automotive Industry ◽  
Industrial Robot ◽  
Welding Process ◽  
High Strength ◽  
Test Material ◽  
Advantages And Disadvantages ◽  
Application Characteristics ◽  
Joining Process ◽  
Gmaw Welding

This paper proposes the development of the methodology to be carried out for the metal joining process through the GMAW welding process in the Fanuc LR Mate 200iD industrial robot. The parameters or properties were considered for the application to be as efficient as possible, such parameters as speed of application, characteristics of the filler material, gas to be used as welding protection. The GMAW welding process can be applied semiautomatically using a hand gun, in which the electrode is fed by a coil, or an automatic form that includes automated equipment or robots. The advantages and disadvantages of the GMAW welding process applied in a manual and automated way were commented. The mechanical properties of the materials to which said welding can be applied were investigated; The materials with which this type of welding can be worked are the high strength materials, which are used in the automotive industry, for the forming of sheet metal. To know the properties of the material, destructive tests were carried out on the test material to be used, as well as the mechanical properties of the welding.

scholarly journals Friction Stir Welding of Aerospace Alloys

2019 ◽  
Vol 48 (1) ◽  
pp. 37-46
Author(s):  
Akshansh Mishra ◽  
Devarrishi Dixit
Keyword(s):  
Friction Stir Welding ◽  
Welding Process ◽  
Space Vehicles ◽  
Friction Stir ◽  
Aerospace Applications ◽  
Aerospace Alloys ◽  
Fuel Tanks ◽  
Higher Temperature ◽  
Solid State Joining ◽  
Joining Process

Friction Stir Welding (FSW) is a solid state joining process which possesses a great potential to revolutionise the aerospace industries. Distinctive materials are selected as aerospace alloys to withstand higher temperature and loads. Sometimes these alloys are difficult to join by a conventional welding process but they are easily welded by FSW process. The FSW process in aerospace applications can be used for: aviation for fuel tanks, repair of faulty welds, cryogenic fuel tanks for space vehicles. Eclipse Aviation, for example, has reported dramatic production cost reductions with FSW when compared to other joining technologies. This paper will discuss about the mechanical and microstructure properties of various aerospace alloys which are joined by FSW process.

scholarly journals Head Stabilization during Minimal Invasive Surgery Tasks: An Uncontrolled Manifold Analysis

2015 ◽  
Vol 3 ◽  
pp. 1434-1441
Author(s):  
Kostas Gianikellis ◽  
Francisco M. Sánchez-Margallo ◽  
Andreas Skiadopoulos ◽  
Juan A. Sánchez-Margallo ◽  
Javier Hermoso de Mendoza Aranda
Keyword(s):  
Invasive Surgery ◽  
Minimal Invasive Surgery ◽  
Minimal Invasive ◽  
Uncontrolled Manifold ◽  
Head Stabilization ◽  
Uncontrolled Manifold Analysis

Microstructure Development in Copper Welded by the FSW-Process

2003 ◽  
Vol 807 ◽  
Author(s):  
Therese Källgren ◽  
Rolf Sandström
Keyword(s):  
Welding Process ◽  
Mechanical Deformation ◽  
Microstructure Development ◽  
Friction Stir ◽  
Friction Heat ◽  
The Third ◽  
Lower Temperature ◽  
Weld Root ◽  
Nuclear Fuel Waste ◽  
Joining Process

ABSTRACTTo ensure safe storage of nuclear fuel waste, copper canisters are proposed as corrosion barrier. One alternative for sealing the copper canisters is Friction Stir Welding (FSW). During the joining process friction heat and mechanical deformation appear between the rotating tool and the material being welded. Liquid metal will not form, since this is a solid state welding process. Three distinct microstructural zones are developed namely the nugget, the thermo-mechanically affected zone (TMAZ) and heat-affected zone (HAZ). The nugget is in the centre of the weld, where the pin is located and where severe plastic deformation occurs that leads to recrystallisation. Surrounding the nugget, the TMAZ is only partially recrystallised, due to lower temperature increase and deformation compared to the nugget. The third zone, HAZ, surrounds the TMAZ. The initial nugget can have a classic round aluminium nugget image, when the welding conditions are cold, but the steady state nugget, is wider near the shoulder and shorter in the weld root.

457: Combinated Peroneal and Tibial Block for Hallux Valgus Minimal Invasive Surgery

2008 ◽  
Vol 33 (5) ◽  
pp. e107-e107
Author(s):  
C GRACIA ◽  
J MASDEU ◽  
A LARRUY ◽  
J SANTOS ◽  
L BLANCO ◽  
...  
Keyword(s):  
Hallux Valgus ◽  
Invasive Surgery ◽  
Minimal Invasive Surgery ◽  
Minimal Invasive

scholarly journals External fixation to correct tarsal-metatarsal fracture in rock pigeon (Columba livia)

Revista CERES ◽  
2017 ◽  
Vol 64 (1) ◽  
pp. 25-30
Author(s):  
Leandro Almeida Rui ◽  
Diego Carvalho Viana ◽  
Adriano Barile Dora ◽  
Paula Fratini
Keyword(s):  
Gold Standard ◽  
Minimal Invasive Surgery ◽  
Surgical Repair ◽  
Bone Fractures ◽  
Columba Livia ◽  
Minimal Invasive ◽  
External Fixators ◽  
Post Surgery ◽  
Metatarsal Fracture ◽  
Rock Pigeon

ABSTRACT Orthopedic conditions, such as bone fractures, are very common in avian medicine. External fixators have been considered the gold standard for birds, since they allow early movement of the limbs and minimal invasive surgery. Fractures in several bones have been successfully treated in pigeons. However, to the best of our knowledge, this case represents the first report of successful surgical repair of tarsal-metatarsal fracture in rock pigeon. External fixator was made with four 24G catheters, being inserted manually proximal and distal to the fracture and connected with polymerizable acrylic. Radiographic consolidation of fracture was observed 60 days post-surgery and anti-inflammatory and antibiotic protocols were successful on avoiding pain and infection during surgery and bone healing.

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