Treating diseases in the field of neurosurgery has progressed concomitantly with technical advances. Here, as a surgical armamentarium for the treatment of cerebral aneurysms, the history and present status of the keyhole approach and the use of neuroendoscopy are reviewed, including our clinical data. The major significance of keyhole approach is to expose an essential space toward a target, a...

BACKGROUND Since 2009, the green Keyhole symbol has been a joint Nordic initiative for signalling healthfulness of specific food products. In 2014, the Danish Ministry of Food, Agriculture and Fisheries carried out a campaign aimed mainly at men over 35 with a low level of education, encouraging them to use the Keyhole in their shopping process. The objective of the study is to evaluate the cam...

The present work is devoted to the numerical analysis of high-power laser beam welding thick sheets at different speeds. A three-dimensional transient multi-physics model developed, allowing for prediction keyhole geometry and final penetration depth. Two ray tracing algorithms are implemented compared, namely a standard approach an using virtual mesh refinement more accurate calculation reflec...

Lasers have been employed in a variety of welding applications for many years. And, as laser technology further develops and diversifies, its uses in welding continue to expand. This article provides an overview of high power lasers in keyhole welding. It then examines the characteristics and advantages of fiber laser sources for welding from Coherent | Rofin, in particular, and review a specif...

Luo, Masiyang, "Weld pool and keyhole dynamic analysis based on visual system and neural network during laser keyhole welding" (2014). Open Access Theses. 652.

Background and Objectives Laparoscopic paraesophageal hernia repair (LPEHR) is the new standard, but the use of mesh is still debated. Biologic mesh has shown great promise, but only the U-shaped onlay has been extensively studied. Postoperative dysphagia has historically been a concern with the use of synthetic keyhole mesh and subsequently slowed its adoption. The purpose of our study was to ...

The production of consistent, high-quality laser welds on zinc-coated steels for the automotive industry remains a challenge. A simple overlap joint geometry is desirable in these applications but has been shown to be extremely detrimental to laser welding because the zinc vapour formed at the interface between the two sheets expands into the keyhole and disrupts fluid flow in the melt pool, wh...

Double-sided arc welding (DSAW) is a novel process for joining metals that is capable of achieving deep narrow penetration in a single pass with minimized distortion. A clear understanding of the process fundamentals is critical in order to fully examine the potential of DSAW, to guide the further developments of the process, to direct the practicability study, and to design the process paramet...

Background: Although the pterional approach is commonly used for microsurgical clipping of intracranial aneurysms of anterior circulation, the incision and temporalis muscle dissection impact postoperative recovery and cosmetic outcomes. The pterional keyhole approach offers similar microsurgical corridors with a substantially shorter incision, less muscle dissection, and a smaller craniotomy f...

PURPOSE To present a new 4D method that is designed to provide high spatial resolution MR angiograms at subsecond temporal resolution by combining different techniques of view sharing with parallel imaging at 3.0T. MATERIALS AND METHODS In the keyhole-based method, a central elliptical cylinder in k-space is repeated n times (keyhole) with a random acquisition (CENTRA), and followed by the re...