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Ablation - Springer Nature

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Last Updated: 10 November 2022

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Computation of Microchannel Dimensions During Laser-Induced Plasma-Assisted Ablation (LIPAA) of Polycarbonate with Copper Metal Target

Laser filtration of such materials is a difficult challenge due to the high transfer of transparent polycarbonate over a range of wavelengths. LIPAA is a high-potential machining process that solves the challenge of machining transparent materials amid of their high visibility in the visible and near-infrared spectral ranges. Extreme numerical simulations were achieved by altering the laser process parameters, viz. Maintaining the scanning speed at a set speed of 4 mm/s, maintaining the pulse repetition rate, pulse duration, and pulse power density, kept the scanning speed at a set value of 4 mm/s. The effect of the laser parameters on the geometric parameters was investigated subsequently.

Source link: https://doi.org/10.1007/978-981-19-4556-4_23


Percutaneous and Laparoscopic-Assisted Ablation of Hepatocellular Carcinoma

Ablation of hepatocellular carcinoma evolved from a palliative drug for unresectable disease to a viable alternative to hepatectomy. A breakthrough in HCC therapy for cirrhotic patients and laparoscopic ablation has been safe and effective in those patients at risk of complications or unsuccessful therapy through a percutaneous route.

Source link: https://doi.org/10.1007/978-3-031-09371-5_8


Declines in serum uric acid level after catheter ablation of atrial fibrillation

Background: Few studies have investigated whether catheter ablation in AF patients improves biomarkers other than serum measurements of brain natriuretic peptide and renal function. Methods and findings were included in the initial AF ablation procedure, but the study included a total of 206 patients who underwent initial AF ablation without changes to oral medications. Both persistent and paroxysmal AF patients were identified, and the degree of post-procedural serum UA decline after ablation was much higher in patients with persistent AF than those with paroxysmal AF. 28 patients with elevated UA level before surgery showed improvement in UA level to normal range, out of 48 patients with elevated UA level before surgery. Conclusions Catheter ablation for AF patients dramatically raised serum UA levels without apparent causes of heart disease, renal function, or inflammation, suggesting that AF ablation could be helpful to AF patients with hyperuricemia.

Source link: https://doi.org/10.1007/s00380-022-02108-w


Effect of the Medium on the Laser Ablation Characteristics of Aluminum Irradiated by Femtosecond Laser Pulses

The aim of this research was to investigate the effect of the surrounding medium on aluminum's laser ablation properties. specimens were exposed to a narrowly focused laser beam in three dissimilar media; air, water, and ionic liquid. For processing, the laser beam was tightly focused using a converging lens, and the laser pulse energy was varied from 1:u20135 –u00b5J. The produced laser tracks and areas were analyzed by field emission scanning electron microscope for their microstructural characterization. Surface patterns induced by laser pulse energy were observed in air, but no LIPSS were observed in the case of water and ionic liquid media for the same laser pulse energy. Due to a change in laser-matter interactions and a halt in the settling of the ablated coating on the surface, the laser ablated surface was cleaner for liquid media as compared to air. In particular, the ablation mechanism of air and liquid has been investigated.

Source link: https://doi.org/10.1007/s40516-022-00194-2


The First Evaluation of Remote Magnetic Navigation-Guided Pediatric Ventricular Arrhythmia Ablation

Catheter ablation is a common treatment option for pediatric cardiology's ventricular arrhythmias. However, no studies have reviewed RMN-guided ablative therapy results in children with VA. This report was designed to determine both procedural and long-term effects in children under the guidance of a RMN-guided VA ablation program. This single-center, retrospective review included all CA procedures for VA treatment in children with or without structural heart disease from 2008 to 2020. RMN or MAN were characterized as two research groups by CA technology: RMN or MAN. At a mean follow-up of 5. 2 u00b1 3. 0 years, recurrence rates were significantly lower in RMN compared to MAN, owing to a first-treatment. Similarly, fluoroscopy doses were dramatically lower in RMN compared to MAN [20 versus 48 mGy, P = 0. 043]. Following their final ablation procedure, 20 patients were out of VA. This is the first analysis to look at the use of RMN in pediatric VA ablation.

Source link: https://doi.org/10.1007/s00246-022-02900-5


Combination Therapy of Mesenchymal Stem Cell Transplantation and Astrocyte Ablation Improve Remyelination in a Cuprizone-Induced Demyelination Mouse Model

However, mesenchymal stem cells can influence myelination in demyelinating disorders. In the cuprizone model of MS, C57BL/6 mice were fed 0. 2% CPZ diet for 12 weeks. This research was conducted to see the effects of single and mixed therapies of astrocyte destruction and MSC transplantation on remyelination. Astrocytes were ablated twice by L-a-adipate at the start of weeks 13 and 14, but MSCs were injected in the corpus callosum at the start of week 13. Motor coordination deficits were significantly reduced in comparison to single treatments in comparison to CPZ mice, after combination therapy of astrocyte destruction and MSC transplantation. Ultimately, the MSC administration's efforts culminated in a dramatic rise in BDNF and NGF mRNA expression levels. In a chronic denyelinating mouse model of MS, our results show that transient abomination of astrocytes as well as MSCs therapy may contribute to remyelination by increasing oligodendrocytes and attenuating gliosis.

Source link: https://doi.org/10.1007/s12035-022-03036-6


Prevention of major biliary complications by fusion imaging for thermal ablation of malignant liver tumors adjacent to the bile ducts: a preliminary comparative study

Thermal ablation, carried out by Purpose Ultrasound -guided thermal ablation, may cause significant biliary problems, particularly in patients with malignant liver tumors adjacent to the bile ducts. MLTs proximal to the bile ducts are proximal to the bile ducts and should be evaluated for the safety and efficacy of FI for the testing. Methods An retrospective single-center review was conducted on a total of 289 patients with 316 MLTs adjacent to the bile ducts. Patients were divided into two groups based on whether FI was used in the ablation procedures. Results of the included tumors The incidence of major biliary complications after ablation in the FI group was 1. 6%, which was significantly less than that in the non-FI group. The FI for a US-guided TA can be a noninvasive way to eliminate significant biliary disorders.

Source link: https://doi.org/10.1007/s00261-022-03631-0


Serum periostin as a predictor of early recurrence of atrial fibrillation after catheter ablation

Catheter ablation is a safe method of rhythm therapy for atrial fibrillation. After a successful atrial septal puncture to detect serum periostin, venious blood was collected before ablation and left atrial blood was collected. After catheter ablation, 27 patients had a recurrence of atrial arrhythmia after catheter ablation. Patients with recurrent atrial arrhythmia had a larger left atrial volume and higher serum periostin levels than those in the non-recurrent group. Patients with left atrial low-voltage areas were more prevalent in the recurrence group. In univariate and multivariate COX regression study, left atrial volume, serum periostin, and left atrial LVAs were included. serum periostin A was 87. 95 ng/ ml at the cut-off value of 87. 95 ng/ ml. The recurrence rate of AF was higher in patients with left-atrial LVAs and elevated serum periostin, according to the Kaplan-u2013Meier survival curve, with a higher mortality rate.

Source link: https://doi.org/10.1007/s00380-022-02115-x


Feasibility analysis and process characteristics of selective laser ablation assisted milling Inconel 718

However, the traditional LAM process used a large spot laser, often leading to high processing costs and overheating bulk materials. A new method of selective laser ablation assisted milling process for nickel-based superalloys was suggested in this paper, but a small power laser with small spot size was used to selectively ablate the uncut surface in front of the cutting machine, resulting in numerous surface defects emerging. The laser ablation effect with low power and a small spot size was first investigated. Process parameters and process characteristics of SLA-Mill were systematically explored. In addition, the chip manufacturing process in the SLA-Mill process was investigated in depth. The resultant cutting force has a reduction of about 30% at laser power of 60 W, cutting speed of 90 m/min, and a minimum depth of 0. 1 mm.

Source link: https://doi.org/10.1007/s40436-021-00384-9


Three-Dimensional Modelling of Femtosecond Laser Ablation of Metals

Metal plating and micro-machining applications are gaining traction due to its high accuracy and negligible heat affected zone. A difference between the temperature of the electrons excited by the laser pulse and the temperature of the lattice is predicted by the two-temperature model, which can be shown by the two-temperature model, where a difference between the electrons excited by the laser pulse and the lattice's temperature is assumed. An analytical model based on this two-temperature model is designed and validated for percussion drilling with a circularly polarized beam in a low corrosion tool steel, which is used in this work. The model created in this work can be used to predict the results of the fs laser percussion drilling process and hence minimize the experimental expenses related to the determination of the optimal process parameters.

Source link: https://doi.org/10.1007/s40516-022-00187-1

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions