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1.
Microsc Microanal ; 27(1): 215-226, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-33509316

RESUMEN

This paper presents an investigation on micropipe evolution from hexagonal voids in physical vapor transport-grown 4H-SiC single crystals using the cathodoluminescence (CL) imaging technique. Complementary techniques optical microscopy, scanning electron microscopy, and energy-dispersive spectroscopy (EDS) are also used to understand the formation mechanism of hexagonal voids along with the origin of pipes from these voids. The ability of CL to image variations along the depth of the sample provides new insights on how micropipes are attached to hexagonal voids that lie deep within the bulk single crystals. CL imaging confirms that multiple micropipes can originate from a single hexagonal void. EDS mapping shows that the inside of the micropipe walls exhibits higher levels of carbon. Investigation of the seed region by optical imaging shows that improper fixing of the seed to the crucible lid is the root cause for the formation of hexagonal voids that subsequently lead to micropipe formation.

2.
Neurol India ; 68(3): 652-653, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32643680

RESUMEN

A suction pressure control valve (SPCV) for microneurosurgery is designed to place control of safe suction pressure in the hands of an operating neurosurgeon. Tumor tissue needs more negative suction pressure as compared to normal brain tissue, cranial nerves, and vessels in the neurosurgical operating field. The authors present the details of a prototype of a simple and inexpensive device for dynamic adjustment of negative suction pressure by the surgeon or the assistant while working on different tissue types during microneurosurgery.


Asunto(s)
Encéfalo , Microcirugia , Encéfalo/cirugía , Nervios Craneales , Humanos , Succión
3.
J Med Eng Technol ; 44(5): 224-226, 2020 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-32552206

RESUMEN

Collection of tissue sample is one of the most important step in neurosurgery while removing intracranial or intraspinal space occupying lesions (SOL). It is required for tissue diagnosis, further treatment planning and prognostication. There is no mention of any tool except taking pieces using various biopsy/holding forceps or curettes. Author has designed a prototype of a tumour collection chamber (TCC), which is connected to the suction tubing for collection of solid tumours during surgical removal by suction by selectively allowing the suction flow through the TCC. It is easy to use as and when the tumour is being removed and suction flow can be bypassed by the surgeon or the assistant once tumour removal is done or otherwise.


Asunto(s)
Biopsia/instrumentación , Neoplasias/cirugía , Neurocirugia/instrumentación , Diseño de Equipo , Succión
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