The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform

Han Yi Cheng - One of the best experts on this subject based on the ideXlab platform.

  • micro nanostructured surface modification using femtosecond laser pulses on minimally invasive Electrosurgical Devices
    Journal of Biomedical Materials Research Part B, 2017
    Co-Authors: Erwan Sugiatno, Keng Liang Ou, Muhammad Ruslin, Chen Yao Su, Han Yi Cheng
    Abstract:

    Abstract The purpose of the present study was to examine thermal damage and a sticking problem in the tissue after the use of a minimally invasive Electrosurgical Device with a nanostructured surface treatment that uses a femtosecond laser pulse (FLP) technique. To safely use an Electrosurgical Device in clinical surgery, it is important to decrease thermal damage to surrounding tissues. The surface characteristics and morphology of the FLP layer were evaluated using optical microscopy, scanning electron microscopy, and transmission electron microscopy; element analysis was performed using energy-dispersive X-ray spectroscopy, grazing incidence X-ray diffraction, and X-ray photoelectron spectroscopy. In the animal model, monopolar Electrosurgical Devices were used to create lesions in the legs of 30 adult rats. Animals were sacrificed for investigations at 0, 3, 7, 14, and 28 days postoperatively. Results indicated that the thermal damage and sticking situations were reduced significantly when a minimally invasive Electrosurgical instrument with an FLP layer was used. Temperatures decreased while film thickness increased. Thermographic data revealed that surgical temperatures in an animal model were significantly lower in the FLP Electrosurgical Device compared with that in the untreated one. Furthermore, the FLP Device created a relatively small area of thermal damage. As already mentioned, the biomedical nanostructured layer reduced thermal damage and promoted the antisticking property with the use of a minimally invasive Electrosurgical Device. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2016.

  • Retraction Note to: Effect of Anti-Sticking Nanostructured Surface Coating on Minimally Invasive Electrosurgical Device in Brain
    Annals of Biomedical Engineering, 2017
    Co-Authors: Han Yi Cheng, Keng Liang Ou, Hsi Jen Chiang
    Abstract:

    The purpose of the present study was to examine the extent of thermal injury in the brain after the use of a minimally invasive Electrosurgical Device with a nanostructured copper-doped diamond-like carbon (DLC-Cu) surface coating. To effectively utilize an Electrosurgical Device in clinical surgery, it is important to decrease the thermal injury to the adjacent tissues. The surface characteristics and morphology of DLC-Cu thin film was evaluated using a contact angle goniometer, scanning electron microscopy, and atomic force microscopy. Three-dimensional biomedical brain models were reconstructed using magnetic resonance images to simulate the Electrosurgical procedure. Results indicated that the temperature was reduced significantly when a minimally invasive Electrosurgical Device with a DLC-Cu thin film coating (DLC-Cu-SS) was used. Temperatures decreased with the use of Devices with increasing film thickness. Thermographic data revealed that surgical temperatures in an animal model were significantly lower with the DLC-Cu-SS Electrosurgical Device compared to an untreated Device. Furthermore, the DLC-Cu-SS Device created a relatively small region of injury and lateral thermal range. As described above, the biomedical nanostructured film reduced excessive thermal injury with the use of a minimally invasive Electrosurgical Device in the brain.

  • Micro/nanostructured surface modification using femtosecond laser pulses on minimally invasive Electrosurgical Devices
    Journal of Biomedical Materials Research Part B, 2016
    Co-Authors: Erwan Sugiatno, Keng Liang Ou, Muhammad Ruslin, Chen Yao Su, Han Yi Cheng
    Abstract:

    : The purpose of the present study was to examine thermal damage and a sticking problem in the tissue after the use of a minimally invasive Electrosurgical Device with a nanostructured surface treatment that uses a femtosecond laser pulse (FLP) technique. To safely use an Electrosurgical Device in clinical surgery, it is important to decrease thermal damage to surrounding tissues. The surface characteristics and morphology of the FLP layer were evaluated using optical microscopy, scanning electron microscopy, and transmission electron microscopy; element analysis was performed using energy-dispersive X-ray spectroscopy, grazing incidence X-ray diffraction, and X-ray photoelectron spectroscopy. In the animal model, monopolar Electrosurgical Devices were used to create lesions in the legs of 30 adult rats. Animals were sacrificed for investigations at 0, 3, 7, 14, and 28 days postoperatively. Results indicated that the thermal damage and sticking situations were reduced significantly when a minimally invasive Electrosurgical instrument with an FLP layer was used. Temperatures decreased while film thickness increased. Thermographic data revealed that surgical temperatures in an animal model were significantly lower in the FLP Electrosurgical Device compared with that in the untreated one. Furthermore, the FLP Device created a relatively small area of thermal damage. As already mentioned, the biomedical nanostructured layer reduced thermal damage and promoted the antisticking property with the use of a minimally invasive Electrosurgical Device. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 865-873, 2017.

  • RETRACTED ARTICLE: Effect of Anti-Sticking Nanostructured Surface Coating on Minimally Invasive Electrosurgical Device in Brain
    Annals of Biomedical Engineering, 2015
    Co-Authors: Han Yi Cheng, Keng Liang Ou, Hsi Jen Chiang
    Abstract:

    The purpose of the present study was to examine the extent of thermal injury in the brain after the use of a minimally invasive Electrosurgical Device with a nanostructured copper-doped diamond-like carbon (DLC-Cu) surface coating. To effectively utilize an Electrosurgical Device in clinical surgery, it is important to decrease the thermal injury to the adjacent tissues. The surface characteristics and morphology of DLC-Cu thin film was evaluated using a contact angle goniometer, scanning electron microscopy, and atomic force microscopy. Three-dimensional biomedical brain models were reconstructed using magnetic resonance images to simulate the Electrosurgical procedure. Results indicated that the temperature was reduced significantly when a minimally invasive Electrosurgical Device with a DLC-Cu thin film coating (DLC-Cu-SS) was used. Temperatures decreased with the use of Devices with increasing film thickness. Thermographic data revealed that surgical temperatures in an animal model were significantly lower with the DLC-Cu-SS Electrosurgical Device compared to an untreated Device. Furthermore, the DLC-Cu-SS Device created a relatively small region of injury and lateral thermal range. As described above, the biomedical nanostructured film reduced excessive thermal injury with the use of a minimally invasive Electrosurgical Device in the brain.

  • The Application of Advanced Nanostructured Film in Electrosurgical Device: Anti-Sticking Behavior and Thermal Injury
    Journal of Nanomedicine & Nanotechnology, 2015
    Co-Authors: Keng Liang Ou, Han Yi Cheng
    Abstract:

    Background: Minimally invasive surgery is performed using an endoscope and other instruments including the Electrosurgical units. However, concerns including surgical smoke, tissue sticking, and thermal injury are remaining in electro surgery. Aims: Accordingly, a newly developed Electrosurgical electrode coating with hydrogenated Cu-incorporated diamond-like carbon (DLC-Cu) film is purposed to improve the instrument performance. Methods: The morphologies of DLC-Cu surfaces were characterized using transmission electron microscopy, scanning electron microscopy and atomic force microscopy. In this study, lesions were made on the liver lobes of adult rats, using a monopolar Electrosurgical unit equipped with untreated stainless steel electrodes or treated-electrodes. Animals were sacrificed for evaluations at 0, 3, 7, and 28 days post-operatively. Results: Treated-electrodes generate less sticking tissues and adhesive blood cells. Thermography revealed the surgical temperature in liver tissue from the treated -electrode was significantly lower than the untreated-electrode. Total injury area of livers treated with treated-electrodes was significantly smaller than the untreated-electrodes treatment. Moreover, treated-electrodes caused a relatively smaller area of lateral thermal injury, a smaller area of fibrotic tissue, and a faster process of remodeling than the untreated-electrodes. Western blot analysis showed that rats treated with treated-electrode expressed lower levels of NF-κB, caspase-3, and MMP-9 than untreated-electrode. Immunofluorescence staining for caspase-3 revealed the untreated-electrode caused more serious injury. Conclusions: This study reveals that the plating of electrodes with hydrogenated Cu-incorporated diamond-like carbon film is an efficient method for improving the performance of Electrosurgical units. However, more tests must be carried out to confirm these promising findings in human patients.

Hsi Jen Chiang - One of the best experts on this subject based on the ideXlab platform.

  • Retraction Note to: Effect of Anti-Sticking Nanostructured Surface Coating on Minimally Invasive Electrosurgical Device in Brain
    Annals of Biomedical Engineering, 2017
    Co-Authors: Han Yi Cheng, Keng Liang Ou, Hsi Jen Chiang
    Abstract:

    The purpose of the present study was to examine the extent of thermal injury in the brain after the use of a minimally invasive Electrosurgical Device with a nanostructured copper-doped diamond-like carbon (DLC-Cu) surface coating. To effectively utilize an Electrosurgical Device in clinical surgery, it is important to decrease the thermal injury to the adjacent tissues. The surface characteristics and morphology of DLC-Cu thin film was evaluated using a contact angle goniometer, scanning electron microscopy, and atomic force microscopy. Three-dimensional biomedical brain models were reconstructed using magnetic resonance images to simulate the Electrosurgical procedure. Results indicated that the temperature was reduced significantly when a minimally invasive Electrosurgical Device with a DLC-Cu thin film coating (DLC-Cu-SS) was used. Temperatures decreased with the use of Devices with increasing film thickness. Thermographic data revealed that surgical temperatures in an animal model were significantly lower with the DLC-Cu-SS Electrosurgical Device compared to an untreated Device. Furthermore, the DLC-Cu-SS Device created a relatively small region of injury and lateral thermal range. As described above, the biomedical nanostructured film reduced excessive thermal injury with the use of a minimally invasive Electrosurgical Device in the brain.

  • RETRACTED ARTICLE: Effect of Anti-Sticking Nanostructured Surface Coating on Minimally Invasive Electrosurgical Device in Brain
    Annals of Biomedical Engineering, 2015
    Co-Authors: Han Yi Cheng, Keng Liang Ou, Hsi Jen Chiang
    Abstract:

    The purpose of the present study was to examine the extent of thermal injury in the brain after the use of a minimally invasive Electrosurgical Device with a nanostructured copper-doped diamond-like carbon (DLC-Cu) surface coating. To effectively utilize an Electrosurgical Device in clinical surgery, it is important to decrease the thermal injury to the adjacent tissues. The surface characteristics and morphology of DLC-Cu thin film was evaluated using a contact angle goniometer, scanning electron microscopy, and atomic force microscopy. Three-dimensional biomedical brain models were reconstructed using magnetic resonance images to simulate the Electrosurgical procedure. Results indicated that the temperature was reduced significantly when a minimally invasive Electrosurgical Device with a DLC-Cu thin film coating (DLC-Cu-SS) was used. Temperatures decreased with the use of Devices with increasing film thickness. Thermographic data revealed that surgical temperatures in an animal model were significantly lower with the DLC-Cu-SS Electrosurgical Device compared to an untreated Device. Furthermore, the DLC-Cu-SS Device created a relatively small region of injury and lateral thermal range. As described above, the biomedical nanostructured film reduced excessive thermal injury with the use of a minimally invasive Electrosurgical Device in the brain.

  • Effect of Anti-Sticking Nanostructured Surface Coating on Minimally Invasive Electrosurgical Device in Brain
    Annals of Biomedical Engineering, 2015
    Co-Authors: Han Yi Cheng, Keng Liang Ou, Hsi Jen Chiang
    Abstract:

    : The purpose of the present study was to examine the extent of thermal injury in the brain after the use of a minimally invasive Electrosurgical Device with a nanostructured copper-doped diamond-like carbon (DLC-Cu) surface coating. To effectively utilize an Electrosurgical Device in clinical surgery, it is important to decrease the thermal injury to the adjacent tissues. The surface characteristics and morphology of DLC-Cu thin film was evaluated using a contact angle goniometer, scanning electron microscopy, and atomic force microscopy. Three-dimensional biomedical brain models were reconstructed using magnetic resonance images to simulate the Electrosurgical procedure. Results indicated that the temperature was reduced significantly when a minimally invasive Electrosurgical Device with a DLC-Cu thin film coating (DLC-Cu-SS) was used. Temperatures decreased with the use of Devices with increasing film thickness. Thermographic data revealed that surgical temperatures in an animal model were significantly lower with the DLC-Cu-SS Electrosurgical Device compared to an untreated Device. Furthermore, the DLC-Cu-SS Device created a relatively small region of injury and lateral thermal range. As described above, the biomedical nanostructured film reduced excessive thermal injury with the use of a minimally invasive Electrosurgical Device in the brain.

  • The Application of Minimally Invasive Devices with Nanostructured Surface Functionalization: Antisticking Behavior on Devices and Liver Tissue Interface in Rat
    Journal of Nanomaterials, 2015
    Co-Authors: Hsi Jen Chiang, Han Yi Cheng, Che-shun Wang, Keng Liang Ou
    Abstract:

    This study investigated the thermal injury and adhesion property of a novel electrosurgery of liver using copper-doped diamond-like carbon (DLC-Cu) surface treatment. It is necessary to reduce the thermal damage of surrounding tissues for clinical electrosurgeries. The surface morphologies of stainless steel (SS) coated with DLC (DLC-Cu-SS) films were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Bionic liver models were reconstructed using magnetic resonance imaging (MRI) to simulate electrosurgery. Cell cytotoxicity assays showed that the DLC-Cu thin film was nontoxic. The temperature of tissue decreased significantly with use of the Electrosurgical Device with nanostructured DLC-Cu films and increased with increasing thickness of the films. Thermography revealed that the surgical temperature in the DLC-Cu-SS Electrosurgical Device was significantly lower than that in the untreated Device in the animal model. Moreover, compared to the SS Electrosurgical Device, the DLC-Cu-SS Electrosurgical Device caused a relatively small injury area and lateral thermal effect. The results indicate that the DLC-Cu-SS Electrosurgical Device decreases excessive thermal injury and ensures homogeneous temperature transformation in the tissues.

Keng Liang Ou - One of the best experts on this subject based on the ideXlab platform.

  • micro nanostructured surface modification using femtosecond laser pulses on minimally invasive Electrosurgical Devices
    Journal of Biomedical Materials Research Part B, 2017
    Co-Authors: Erwan Sugiatno, Keng Liang Ou, Muhammad Ruslin, Chen Yao Su, Han Yi Cheng
    Abstract:

    Abstract The purpose of the present study was to examine thermal damage and a sticking problem in the tissue after the use of a minimally invasive Electrosurgical Device with a nanostructured surface treatment that uses a femtosecond laser pulse (FLP) technique. To safely use an Electrosurgical Device in clinical surgery, it is important to decrease thermal damage to surrounding tissues. The surface characteristics and morphology of the FLP layer were evaluated using optical microscopy, scanning electron microscopy, and transmission electron microscopy; element analysis was performed using energy-dispersive X-ray spectroscopy, grazing incidence X-ray diffraction, and X-ray photoelectron spectroscopy. In the animal model, monopolar Electrosurgical Devices were used to create lesions in the legs of 30 adult rats. Animals were sacrificed for investigations at 0, 3, 7, 14, and 28 days postoperatively. Results indicated that the thermal damage and sticking situations were reduced significantly when a minimally invasive Electrosurgical instrument with an FLP layer was used. Temperatures decreased while film thickness increased. Thermographic data revealed that surgical temperatures in an animal model were significantly lower in the FLP Electrosurgical Device compared with that in the untreated one. Furthermore, the FLP Device created a relatively small area of thermal damage. As already mentioned, the biomedical nanostructured layer reduced thermal damage and promoted the antisticking property with the use of a minimally invasive Electrosurgical Device. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2016.

  • Retraction Note to: Effect of Anti-Sticking Nanostructured Surface Coating on Minimally Invasive Electrosurgical Device in Brain
    Annals of Biomedical Engineering, 2017
    Co-Authors: Han Yi Cheng, Keng Liang Ou, Hsi Jen Chiang
    Abstract:

    The purpose of the present study was to examine the extent of thermal injury in the brain after the use of a minimally invasive Electrosurgical Device with a nanostructured copper-doped diamond-like carbon (DLC-Cu) surface coating. To effectively utilize an Electrosurgical Device in clinical surgery, it is important to decrease the thermal injury to the adjacent tissues. The surface characteristics and morphology of DLC-Cu thin film was evaluated using a contact angle goniometer, scanning electron microscopy, and atomic force microscopy. Three-dimensional biomedical brain models were reconstructed using magnetic resonance images to simulate the Electrosurgical procedure. Results indicated that the temperature was reduced significantly when a minimally invasive Electrosurgical Device with a DLC-Cu thin film coating (DLC-Cu-SS) was used. Temperatures decreased with the use of Devices with increasing film thickness. Thermographic data revealed that surgical temperatures in an animal model were significantly lower with the DLC-Cu-SS Electrosurgical Device compared to an untreated Device. Furthermore, the DLC-Cu-SS Device created a relatively small region of injury and lateral thermal range. As described above, the biomedical nanostructured film reduced excessive thermal injury with the use of a minimally invasive Electrosurgical Device in the brain.

  • Micro/nanostructured surface modification using femtosecond laser pulses on minimally invasive Electrosurgical Devices
    Journal of Biomedical Materials Research Part B, 2016
    Co-Authors: Erwan Sugiatno, Keng Liang Ou, Muhammad Ruslin, Chen Yao Su, Han Yi Cheng
    Abstract:

    : The purpose of the present study was to examine thermal damage and a sticking problem in the tissue after the use of a minimally invasive Electrosurgical Device with a nanostructured surface treatment that uses a femtosecond laser pulse (FLP) technique. To safely use an Electrosurgical Device in clinical surgery, it is important to decrease thermal damage to surrounding tissues. The surface characteristics and morphology of the FLP layer were evaluated using optical microscopy, scanning electron microscopy, and transmission electron microscopy; element analysis was performed using energy-dispersive X-ray spectroscopy, grazing incidence X-ray diffraction, and X-ray photoelectron spectroscopy. In the animal model, monopolar Electrosurgical Devices were used to create lesions in the legs of 30 adult rats. Animals were sacrificed for investigations at 0, 3, 7, 14, and 28 days postoperatively. Results indicated that the thermal damage and sticking situations were reduced significantly when a minimally invasive Electrosurgical instrument with an FLP layer was used. Temperatures decreased while film thickness increased. Thermographic data revealed that surgical temperatures in an animal model were significantly lower in the FLP Electrosurgical Device compared with that in the untreated one. Furthermore, the FLP Device created a relatively small area of thermal damage. As already mentioned, the biomedical nanostructured layer reduced thermal damage and promoted the antisticking property with the use of a minimally invasive Electrosurgical Device. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 865-873, 2017.

  • RETRACTED ARTICLE: Effect of Anti-Sticking Nanostructured Surface Coating on Minimally Invasive Electrosurgical Device in Brain
    Annals of Biomedical Engineering, 2015
    Co-Authors: Han Yi Cheng, Keng Liang Ou, Hsi Jen Chiang
    Abstract:

    The purpose of the present study was to examine the extent of thermal injury in the brain after the use of a minimally invasive Electrosurgical Device with a nanostructured copper-doped diamond-like carbon (DLC-Cu) surface coating. To effectively utilize an Electrosurgical Device in clinical surgery, it is important to decrease the thermal injury to the adjacent tissues. The surface characteristics and morphology of DLC-Cu thin film was evaluated using a contact angle goniometer, scanning electron microscopy, and atomic force microscopy. Three-dimensional biomedical brain models were reconstructed using magnetic resonance images to simulate the Electrosurgical procedure. Results indicated that the temperature was reduced significantly when a minimally invasive Electrosurgical Device with a DLC-Cu thin film coating (DLC-Cu-SS) was used. Temperatures decreased with the use of Devices with increasing film thickness. Thermographic data revealed that surgical temperatures in an animal model were significantly lower with the DLC-Cu-SS Electrosurgical Device compared to an untreated Device. Furthermore, the DLC-Cu-SS Device created a relatively small region of injury and lateral thermal range. As described above, the biomedical nanostructured film reduced excessive thermal injury with the use of a minimally invasive Electrosurgical Device in the brain.

  • The Application of Advanced Nanostructured Film in Electrosurgical Device: Anti-Sticking Behavior and Thermal Injury
    Journal of Nanomedicine & Nanotechnology, 2015
    Co-Authors: Keng Liang Ou, Han Yi Cheng
    Abstract:

    Background: Minimally invasive surgery is performed using an endoscope and other instruments including the Electrosurgical units. However, concerns including surgical smoke, tissue sticking, and thermal injury are remaining in electro surgery. Aims: Accordingly, a newly developed Electrosurgical electrode coating with hydrogenated Cu-incorporated diamond-like carbon (DLC-Cu) film is purposed to improve the instrument performance. Methods: The morphologies of DLC-Cu surfaces were characterized using transmission electron microscopy, scanning electron microscopy and atomic force microscopy. In this study, lesions were made on the liver lobes of adult rats, using a monopolar Electrosurgical unit equipped with untreated stainless steel electrodes or treated-electrodes. Animals were sacrificed for evaluations at 0, 3, 7, and 28 days post-operatively. Results: Treated-electrodes generate less sticking tissues and adhesive blood cells. Thermography revealed the surgical temperature in liver tissue from the treated -electrode was significantly lower than the untreated-electrode. Total injury area of livers treated with treated-electrodes was significantly smaller than the untreated-electrodes treatment. Moreover, treated-electrodes caused a relatively smaller area of lateral thermal injury, a smaller area of fibrotic tissue, and a faster process of remodeling than the untreated-electrodes. Western blot analysis showed that rats treated with treated-electrode expressed lower levels of NF-κB, caspase-3, and MMP-9 than untreated-electrode. Immunofluorescence staining for caspase-3 revealed the untreated-electrode caused more serious injury. Conclusions: This study reveals that the plating of electrodes with hydrogenated Cu-incorporated diamond-like carbon film is an efficient method for improving the performance of Electrosurgical units. However, more tests must be carried out to confirm these promising findings in human patients.

Albert J. Shih - One of the best experts on this subject based on the ideXlab platform.

  • Electrosurgical Vessel Sealing Tissue Temperature: Experimental Measurement and Finite Element Modeling
    IEEE Transactions on Biomedical Engineering, 2013
    Co-Authors: Roland K. Chen, Robert E. Dodde, Matthew W. Chastagner, Albert J. Shih
    Abstract:

    The temporal and spatial tissue temperature profile in Electrosurgical vessel sealing was experimentally measured and modeled using finite element modeling (FEM). Vessel sealing procedures are often performed near the neurovascular bundle and may cause collateral neural thermal damage. Therefore, the heat generated during Electrosurgical vessel sealing is of concern among surgeons. Tissue temperature in an in vivo porcine femoral artery sealed using a bipolar Electrosurgical Device was studied. Three FEM techniques were incorporated to model the tissue evaporation, water loss, and fusion by manipulating the specific heat, electrical conductivity, and electrical contact resistance, respectively. These three techniques enable the FEM to accurately predict the vessel sealing tissue temperature profile. The averaged discrepancy between the experimentally measured temperature and the FEM predicted temperature at three thermistor locations is less than 7%. The maximum error is 23.9%. Effects of the three FEM techniques are also quantified.

  • Monopolar Electrosurgical Thermal Management for Minimizing Tissue Damage
    IEEE Transactions on Biomedical Engineering, 2012
    Co-Authors: Robert E. Dodde, James D. Geiger, Albert J. Shih
    Abstract:

    In this study, a novel thermal management system (TMS) is developed for the minimization of thermal spread created by a monopolar Electrosurgical Device, the most commonly used surgical instrument. The phenomenon of resistive heating of tissue is modeled using the finite-element method (FEM) to analyze the electrical potential and temperature distributions in biological tissue subjected to heat generation during monopolar electrosurgery. Ex vivo experiments are used to validate the FEM by comparing the model predicted and experimentally measured temperatures. The predicted FEM maximum temperature 1.0 mm adjacent to the electrode is within 1% of the experimentally measured maximum temperature using a standard monopolar pencil electrode. A TMS consisting of adjacent cooling channels produces coagulation volumes 80% that of standard monopolar procedures while maintaining comparable temperatures in the targeted tissue below the electrode. In vivo temperatures using a Device incorporating a TMS at distances of 2 and 3 mm adjacent to the electrode edge are maintained below temperatures known to damage tissue.

  • Monopolar Electrosurgical Thermal Management System to Reduce Lateral Thermal Damage During Surgery
    Journal of Medical Devices-transactions of The Asme, 2010
    Co-Authors: Robert E. Dodde, James D. Geiger, Albert J. Shih
    Abstract:

    A monopolar Electrosurgical Device is the most commonly used energy-based surgical instrument. Monopolar Devices are primarily applied to incise, ablate, dissect, and coagulate tissue by transferring electrical energy to the tissue in the form of heat generation through resistive heating. The substantial amount of heat created by the monopolar Device has been shown to spread throughout the tissue, creating unintended tissue damage, which can lead to nerve thermal damage and loss of normal bodily functions. Due to this fact, energy-based Devices have had a limited use in surgical procedures performed near neurovascular bundles. The extent to which the generated heat raises the temperature of the surrounding tissue is referred to as the Device’s thermal spread. In this study, ex vivo and in vivo experiments have shown that a novel thermal management system (TMS) can reduce the amount of thermal spread created by a typical monopolar Device, thus eliminating the thermal collateral tissue damage typically caused during a monopolar procedure. The incorporation of a TMS consisting of adjacent cooling channels reduces the thermal spread of the Device, as illustrated in a reduction as high as 50% in the maximum temperature recorded during an in vivo experimental procedure. The design of the TMS was aided by finite element modeling (FEM). The phenomenon of monopolar resistive heating was modeled to analyze the temperature distributions in biological tissue subjected to heat generation by a commonly used monopolar Electrosurgical Device. The mathematical model was verified by comparing the model’s predicted temperature distribution with experimental results. Ex vivo experiments were performed with liver tissue heated by a monopolar pencil electrode. The experimental data for 1 mm distance from the electrode are seen to fit within 1% of the predicted temperature values by the FEM simulation.

  • Experimental and Finite Element Analysis of the Thermal-Electric Process in Monopolar Electrosurgical Thermal Management
    Volume 1: Advanced Energy Systems; Advanced and Digital Manufacturing; Advanced Materials; Aerospace, 2008
    Co-Authors: Robert E. Dodde, James D. Geiger, Albert J. Shih
    Abstract:

    This study develops a thermal management system for the most commonly used energy-based surgical instrument: the monopolar Electrosurgical Device. Monopolar electrosurgery, using the same principle as the electrical discharge machining, is widely used to cut or remove tissue by sparks during surgical operations. This study develops a thermal management system consists of cooling channels placed around the active electrode to reduce the thermal damage to the tissue. Finite element modeling (FEM) was performed to analyze temperature distribution in biological tissue subject to heat generation by a commonly used monopolar Electrosurgical Device. The mathematical model was verified by comparing FEM predicted temperature distribution with experimental measurements. Exvivo experiments were performed with bovine liver tissue heated by a monopolar pencil electrode. The experimental data for 1 mm distance from the electrode is seen to fit within 1% of the predicted temperature values by the FEM simulation. The accuracy of the model decreases at further distances from the electrode. The inaccuracies are believed to be due to unaccounted temperature-dependent thermal conductivity. The addition of the cooling channels shows a reduction of the radial thermal damage of the tissue in both FEM simulations and ex-vivo experimental procedures.Copyright © 2008 by ASME

Beat P. Müller-stich - One of the best experts on this subject based on the ideXlab platform.

  • Transpapillary endopancreatic surgery: decompression of duct system and comparison of greenlight laser with monopolar Electrosurgical Device in ex vivo and in vivo animal models
    Surgical Endoscopy, 2018
    Co-Authors: Philip C. Müller, Daniel C. Steinemann, Lukas Chinczewski, Gencay Hatiboglu, Felix Nickel, Kaspar Z’graggen, Beat P. Müller-stich
    Abstract:

    Background Endopancreatic surgery (EPS) is an experimental minimally invasive technique for resection of pancreatic tissue from inside the pancreatic duct, accessed via the duodenum and papilla. It is proposed as an alternative to duodenum-preserving pancreatic head resection in benign diseases such as chronic pancreatitis (CP). This study evaluated the use of EPS for resection of pancreatic duct stenoses. Moreover, greenlight laser (GLL) and monopolar Electrosurgical Device (MES) were compared as resection tools for EPS. Methods The suitability of EPS for resection of stenoses was evaluated in ex vivo bovine pancreas ( n  = 8). Artificially created stenoses in the pancreatic head were accessed via the duodenal papilla and resected from inside the organ with MES through a rigid endoscope. Furthermore, standardized pancreatic resections were performed in an in vivo porcine model using either GLL ( n  = 18) or MES ( n  = 18) to compare blood loss, operating time, and complications. Thermal damage to the surrounding tissue was assessed using a standardized histological classification. Results Stenosis resection by EPS was feasible in 8/8 bovine pancreases, with a procedure time of 17 (12–24) min. No perforation of the organ occurred. Resection by GLL was associated with reduced blood loss [median 1.7 (interquartile range 0.6–2.6) ml vs. 5.1 (3.8–13.2) ml; p  

  • Transpapillary endopancreatic surgery: decompression of duct system and comparison of greenlight laser with monopolar Electrosurgical Device in ex vivo and in vivo animal models
    Surgical Endoscopy and Other Interventional Techniques, 2018
    Co-Authors: Philip C. Müller, Daniel C. Steinemann, Lukas Chinczewski, Gencay Hatiboglu, Felix Nickel, Kaspar Z’graggen, Beat P. Müller-stich
    Abstract:

    Endopancreatic surgery (EPS) is an experimental minimally invasive technique for resection of pancreatic tissue from inside the pancreatic duct, accessed via the duodenum and papilla. It is proposed as an alternative to duodenum-preserving pancreatic head resection in benign diseases such as chronic pancreatitis (CP). This study evaluated the use of EPS for resection of pancreatic duct stenoses. Moreover, greenlight laser (GLL) and monopolar Electrosurgical Device (MES) were compared as resection tools for EPS. The suitability of EPS for resection of stenoses was evaluated in ex vivo bovine pancreas (n = 8). Artificially created stenoses in the pancreatic head were accessed via the duodenal papilla and resected from inside the organ with MES through a rigid endoscope. Furthermore, standardized pancreatic resections were performed in an in vivo porcine model using either GLL (n = 18) or MES (n = 18) to compare blood loss, operating time, and complications. Thermal damage to the surrounding tissue was assessed using a standardized histological classification. Stenosis resection by EPS was feasible in 8/8 bovine pancreases, with a procedure time of 17 (12–24) min. No perforation of the organ occurred. Resection by GLL was associated with reduced blood loss [median 1.7 (interquartile range 0.6–2.6) ml vs. 5.1 (3.8–13.2) ml; p