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Biomedical subjects

M A Afromowitz

Publications and source records attributed to M A Afromowitz.

8 recordsLinked to original sources
PubMed1991

Development of medical pressure and temperature sensors employing optical spectrum modulation.

Fiber optic Fabry-Perot sensors have been developed whose optical reflectance varies with optical cavity depth (pressure) or with change in a material's refractive index (temperature). These sensors employ a unique combination of features: they are interrogated by an LED; they are designed to operate within a single reflectance cycle; and their returned light is analyzed by a dichroic ratio technique. The sensors use a step index glass fiber and are relatively insensitive to absolute light levels and fiber bending. They have an expanded linear operating range and can be built for low cost disposable applications. Sensor performance meets or exceeds established medical requirements.

Blood Pressure Determination↗
PubMed1984

Burn depth estimation--man or machine.

A Burn Depth Indicator, utilizing reflectance ratios of red, green, and infrared light, has been devised and clinically tested for 18 months at our Burn Center. Using the endpoint of wound healing in less than or more than 3 weeks, clinical assessment by two experienced surgeons of intermediate depth wounds was compared to readings from the BDI . In about one third of cases the surgeons were unwilling to commit themselves to a prediction. In the cases where the surgeons were willing to make a prediction, they were incorrect about 25% of the time. The BDI was significantly more accurate than the clinical assessment in those predicted not to heal by the surgeons and maintained an accuracy of 79% in the wounds where the surgeons would not make a prediction. The BDI is portable, noninvasive, and provides an immediate reading. It may have utility as a triage tool for emergency rooms or combat situations, and has utility at present in our Burn Center as a more accurate tool than our clinical judgment in predicting which wounds should be excised and grafted during the first few days after injury.

Burns↗
PubMed1977

Fabrication of pH-sensitive implantable electrode by thick film hybrid technology.

We report preliminary results of our experiments directed at fabricating pH-sensitive electrodes suitable for in vivo use by means of thick film screening techniques. Our results show that glass membranes of suitable thickness and possessing nearly theoretical sensitivity to pH can be fabricated by this process. A hybrid electrode structure permits the incorporation of a source follower FET amplifier directly adjacent to the pH membrane, significantly reducing response time and noise pick-up. Extension of the basic electrode structure to accommodate membranes sensitive to other ions is discussed.

Biomedical Engineering↗