TECHNICAL NOTE: A LOW COST PRESSURE SENSOR FOR LONG-TERM UTERINE CONTRACTION MONITORING

Home Uterine Activity Monitoring (HUAM) has demonstrated to be of great value for preventing preterm labor in recent years. In this research, a low cost monitoring device for non-invasive monitoring of the uterine activity in pregnant women is presented. The new device has been designed based on an inductive Colpitz oscillator and vertical displacement of a ferrite core in a coil. The resulting frequency of the oscillator is proportional to the pressure in the external surface of the abdomen. This frequency is measured by the portable monitor. A low-power static random access memory (SRAM) provides long-term data storage. The proposed sensor for detecting uterine contractions has light weight, high stability and low cost. This sensor is very simple to manufacture and use for long-term ambulatory monitoring of the uterine activity. Furthermore, this sensor can be calibrated using software. Other features of the sensor are, resolution of ۰.۱۳ mmHg, repeatability close to ۹۶% and input range from ۰ to ۹۵.۳۲ mmHg.

کلیدواژه ها:

PERSSURE MEASUREMENT ، UTERINE ACTIVITY MONITORING ، AMBULATORY PERSSURE ، LONG-TERM UTERINE CONTRACTION MONITORING T ، PRETERM LABOR DETECTION ، ااندازه گیری فشار ، مانیتورینگ فعالیتهای رحمی ، فشار شکمی ، ثبت طولانی مدت انقباضات ، تشخیص زود هنگام زایمان زودرس