Biomedical subjects

K Arabi

Publications and source records attributed to K Arabi.

4 recordsLinked to original sources

PubMed1997

Implantable volume monitor and miniaturized stimulator dedicated to bladder control.

This paper describes a new miniaturized implantable bladder controller that is composed of 4 main parts: a volume monitoring device based on the tomography approach, a fully programmable miniaturized central processor and stimulator, a bidirectional data and power link, and an external controller. The proposed system is intended to restore both normal bladder functions (retention and voiding) to spinal cord injured patients. The system contains a mixed-signal (analog/digital) feedback loop to command the bladder functions through neuromuscular stimulation techniques. The implantable circuitry is powered by a single encoded radiofrequency carried and may have up to 8 independently controlled monopolar (4 bipolar) channels. The microstimulator is able to generate a wide range of stimulation patterns, including selective stimulation waveforms. In addition, an optical link transmits the state of the implant and volume monitoring results to the external controller.

Computer Simulation↗

PubMed1996

Implantable multiprogrammable microstimulator dedicated to bladder control.

An implantable multiprogrammable microstimulator that is intended to restore normal bladder functions (retention and incontinence) to spinal cord injured patients is presented. The implantable microstimulator circuitry is externally controlled and is powered by a single encoded radio frequency carrier and has four bipolar (eight monopolar) independently controlled channels. It offers a higher degree of reprogrammability and flexibility and can be used in any neuromuscular applications. The implant system is adaptable to the patient's needs and to future developments in stimulation algorithms, without changing the implant. Features of the microstimulator include its capabilities to generate a wide range of waveforms and to combine up to four different programmable frequencies in each wave train. By using a forward error detection and correction communication protocol, the reliability of the implant is increased. The chip has been designed for structural testability by means of a scan-based test approach and uses circuit techniques to reduce power consumption and ensure long-term stability.

Electric Stimulation↗

PubMed1987

Spinal brucellosis.

The findings in 44 patients with back pain and brucellosis are described. Radiological changes tended to occur in older patients with a longer duration of disease. The younger patients more often experienced an acute arthritis with sacroiliitis resembling a reactive disease. Bone scanning was more sensitive than radiographs, particularly in detecting acute sacroiliitis and hip involvement. The lumbar spine was the most frequently involved site although no part of the spine was spared. Extensive destruction of a vertebral body with little involvement of the adjacent vertebrae, lower lumbar spondylolysis and spondylolisthesis, and discitis with calcification were striking radiological findings hitherto undescribed in brucellosis. Computerized axial tomography (CAT) scanning revealed vertebral-arch destruction in three cases of spondylolisthesis. Circumferential sclerosis of the vertebral bodies was another CAT-scan finding.

Adult↗

PubMed1978

Congenital spinal extradural cyst (lateral meningocele) simulating acute transverse myelitis. Report of a case.

Congenital spinal extradural cysts are rare and may be the cause of acute paraplegia. In their clinical features they closely resemble acute transverse myelitis. Immediate decompression of the spinal cord and removal of the cyst may lead to restoration of normal function. Myelography differentiates these two conditions by showing a cyst in communication with the spinal canal. This investigation must be mandatory.

Acute Disease↗