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REDUCING TOCO SIGNAL AMBIGUITY DURING MONITORING

IP.com Disclosure Number: IPCOM000236332D
Publication Date: 2014-Apr-21
Document File: 6 page(s) / 205K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention eliminates a false signal plotted on a strip chart paper. The invention monitors a patient position and movement using a three axis microelectromechanical systems (MEMS). The three axis microelectromechanical systems (MEMS) accelerometer is mounted on tocodynamometer pulse wave amplitude (PWA) with serial analog output or digital output with serial interface similar to I²C or serial peripheral interface (SPI). Along with a uterine activity (UA) transducer output system simultaneously monitors the patient movement and position using three axis MEMS accelerometer. Before plotting the UA on strip chart paper, monitor confirms the position and movement of the patient. If there is an abnormal position or movement detected using three axis MEMS accelerometer then the system marks an external pressure or movement of the patient in the strip chart paper.

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REDUCING TOCO SIGNAL AMBIGUITY DURING MONITORING

FIELD OF INVENTION

The invention generally relates to a uterine activity (UA) monitoring and more particularly to eliminate a false signal plotted on a strip chart paper.

BACKGROUND OF THE INVENTION

Generally, most of the uterine activity (UA) monitors are based on a principle of pressure sensors.  Most of the time doctors or care givers interpret the UA from strip chart papers. Since UA sensors are based on pressure sensors, the UA sensors are susceptible to external pressures as well.  There is a probability that a patient exerts more additional external pressure due to position or movement. Similarly when the patient is monitored through telemetry, unwanted signals are recorded through UA transducer due to movement of the patient or external pressure exerted on the UA transducer. There are many MEMS based sensors available at very small form factor and low in cost.

A conventional technique related to an apparatus and method for detecting uterine activity. Cutaneous electrodes are used on maternal abdomen to obtain electrophysiological signals which are used to obtain fetal and maternal heart rate. A first input receives electrical signals from the cutaneous electrodes and second input receives movement signals which indicate movement of the maternal body from a movement detector. A signal processor separates a uterine electromyogram signal from fetal and maternal heart rate signals. Motion artefacts are filtered out from the electromyogram using the movement signals.

Another conventional technique relates to a method for operating a monitoring system for monitoring physiological data of a patient. Motion activity data of the patient is obtained for saving power. The measurement of physiological data of the patient is initiated if the motion activity is non-zero and below a selected threshold.

However, the UA plotted on the strip chart paper plot wrong signal or trend due to additional pressure exerted by the patient or movement of the patient.

Therefore, there is a need in the art to remove false signal plotted on the strip chart paper.

BRIEF DESCRIPTION OF THE INVENTION

The present invention eliminates a false signal plotted on a strip chart paper. The invention monitors a patient position and movement using a three axis microelectromechanical systems (MEMS).  The three axis microelectromechanical systems (MEMS) accelerometer is mounted on tocodynamometer pulse wave amplitude (PWA) with serial analog output or digital output with serial interface similar to I²C or serial peripheral interface (SPI).  Along with a uterine activity (UA) transducer output system simultaneously monitors the patient movement and position using three axis MEMS accelerometer. Before plotting the UA on strip chart paper, monitor confirms the position and movement of the patient.  If there is an abnormal position or movement detected using three axis MEMS accelerometer then the system marks an external pressure...