This paper presents the analysis, design, fabrication, and testing of a condenser microphone utilizing a thin low-stress polycrystalline silicon diaphragm suspended above a p+ perforated back plate. The microphone is fabricated using a combination of surface and bulk micromachining techniques in a single wafer process without the need of wafer bonding. The device shows sensitivities of -34 dB (...

A case of diaphragm perforation after radio-frequency ablation (RFA) for lung metastasis from uterine cervical cancer is reported. The patient developed pelvic recurrence and solitary lung metastasis after a radical hysterectomy for uterine cervical cancer. Pelvic radiation and RFA for lung metastasis were performed. Metastasis was located in the laterobasal segment of the lower lobe of the rig...

A high sensitive CMOS Micro-electro-mechanical rectangular capacitive pressure sensor in SiGeMEMS process (Silicon Germanium Micro-electro-mechanical System process) is designed and analyzed. Polycrystalline Silicon Germanium (Poly-SiGe) having low fatigue and high strength is effectively used as the sensor diaphragm material to achieve better reliability. The designed perforated diaphragm clam...

Intra-abdominal abscesses usually occur following any intra-abdominal surgery, trauma, Gastrointestinal infection or intestinal perforation. In particular, the diagnosis of sub-phrenic collection can be notoriously difficult. This fact is expressed by well-known aphorism: 'Pus somewhere, pus nowhere else, under diaphragm'. Sub-diaphragmatic form between diaphragm and abdominal organs, such as l...

A microphone is a transducer that converts acoustic energy into electrical energy. Microphones are widely used in voice communications devices, hearing aids, surveillance and military aims, ultrasonic and acoustic distinction under water, and noise and vibration control (Ma et al. 2002). Micromachining technology has been used to design and fabricate various silicon microphones. Among them, the...

In this paper, a novel single-chip MEMS capacitive microphone is presented. The novelties of this method relies on the moveable aluminum (Al) diaphragm positioned over the backplate electrode, where the diaphragm includes a plurality of holes to allow the air in the gap between the electrode and diaphragm to escape and thus reduce acoustical damping in the microphone. Spin-on-glass (SOG) was us...

INTRODUCTION The case report describes the rare presentation of a 79-year-old patient with a locally perforated splenic flexure tumour of the colon presenting with an apparent empyema thoracis in the absence of abdominal signs or symptoms. CASE PRESENTATION Initial presentation was with a non-productive cough, anorexia and general malaise. An admission chest X-ray and subsequent computed tomo...

Intra-thoracic herniation of abdominal organs following diaphragmatic rupture represents an unusual clinical occurrence with great diagnostic difficulty. The authors present a case of right diaphragmatic rupture related to peritonitis due to perforated duodenal ulcer in previous (1 year before) thoraco-abdominal trauma with complete intra-thoracic herniation of the liver, gallbladder, ascending...

Infantile hypertrophic pyloric stenosis (IHPS) is a common cause of gastric outlet obstruction in infant. The prevalence of IHPS ranges from 1.5 to 4.0 in 1000 live birth1. But the incidence of IHPS has been increasing approximately from 1.5 to 4.0 in 1000 live birth to 1:1502. Though pyloric atresia is a very uncommon cause of gastric outlet obstruction in infant but atresia in this region occ...