Biomedical subjects

A F van Putten

Publications and source records attributed to A F van Putten.

2 recordsLinked to original sources

PubMed1998

Quantifying the potential for independent living in COPD-patients.

In patients with Chronic Obstructive Pulmonary Disease (COPD), daily physical functioning as quantified by energy expenditure, is limited by decreased ventilatory capacity and increased basal metabolic rate in relation to their physical capacity. Starting from the Dutch Health-Care situation, a measurement interpretation model is presented to quantify individual potential for independent living from energy expenditure, aerobic capacity and lung function. The interpretation model concerns only simple routine measurements. After further validation, this model will be used in predicting the clinical effects of environmental improvements.

Activities of Daily Living↗

PubMed1997

A silicon bidirectional flow sensor for measuring respiratory flow.

We describe a solid-state, silicon integrated, bidirectional flow sensor for respiratory applications. The sensor is a thermal vector sensor. The electronic circuitry for obtaining bidirectional sensitivity is presented together with actual application to a healthy volunteer put on mechanical ventilation. The sensor's input flow range is from -60 to +60 L/min, and its rise-time is < or = 40 ms and fall-time is < or = 60 ms. The effect of changes in gas composition as used in mechanically ventilated patients on the sensor output signal are estimated to be less than 2%. The temperature sensitivity is about -1.5% per degree Celsius.

Equipment Design↗