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.

scholarly journals An Experimental Study on Bipolar Tissue Hemostasis and Its Dynamic Impedance

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Xiaoran Li ◽  
Roland Chen ◽  
Wei Li
Keyword(s):  
Minimal Invasive ◽  
Heating Power ◽  
Heating Process ◽  
Medical Procedure ◽  
Quality Prediction ◽  
Seal Failure ◽  
Vessel Sealing ◽  
Dynamic Impedance ◽  
Tissue Zone ◽  
Compression Level

Abstract Bipolar tissue hemostasis is a medical procedure where high frequency alternating current is applied to biological tissue for wound closing and blood vessel sealing through heating. 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 seal 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 examine process parameters and the dynamic behavior of bipolar heating process through electrical impedance measurements. The effects of electrode compression level, heating power, and time are analyzed. Heating energy and bio-impedance are evaluated for quality prediction. Tissue sticking levels were correlated to the size of denatured tissue zone. It is found that tissue denaturation starts from the center of the heated region. Dynamic impedance reveals the stages of tissue hemostasis process. However, it is strongly affected by the compression level and heating power. Existing criteria for quality prediction and control using the heating energy and minimal impedance are not reliable. The size of denatured tissue zone can be predicted with the heating energy; however, the prediction is strongly dependent on the compression level. To avoid sticking, a low power and low compression level should be used for the same denatured tissue zone size.

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.

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

High-Throughput Picosecond Laser Machining of Aerospace Nickel Superalloy

2021 ◽  
pp. 095440542110288
Author(s):  
Sundar Marimuthu ◽  
Bethan Smith
Keyword(s):  
Surface Roughness ◽  
Material Removal Rate ◽  
Material Removal ◽  
Thermal Damage ◽  
Removal Rate ◽  
Picosecond Laser ◽  
Nickel Superalloy ◽  
Laser Machining ◽  
Process Conditions ◽  
Machining Performance

This manuscript discusses the experimental results on 300 W picosecond laser machining of aerospace-grade nickel superalloy. The effect of the laser’s energetic and beam scanning parameters on the machining performance has been studied in detail. The machining performance has been investigated in terms of surface roughness, sub-surface thermal damage, and material removal rate. At optimal process conditions, a picosecond laser with an average power output of 300 W can be used to achieve a material removal rate (MRR) of ∼140 mm3/min, with thermal damage less than 20 µm. Shorter laser pulse widths increase the material removal rate and reduce the resultant surface roughness. High scanning speeds improve the picosecond laser machining performance. Edge wall taper of ∼10° was observed over all the picosecond laser machined slots. The investigation demonstrates that high-power picosecond lasers can be used for the macro-machining of industrial components at an acceptable speed and quality.

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

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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