Early detection of cardiac complications after heart surgery is a crucial demand in clinical surveillance facilities. The use of accelerometer devices fixated to the heart has been demonstrated as a promising method for the detection of myocardial ischemia with high sensitivity and specificity. One of the most important challenges in developing heart implantable accelerometer devices is to minimize any tissue trauma. In this study, a new approach in making a heart muscle implantable accelerometer sensor is described. An overall diameter of 2 mm is achieved by encapsulating a miniaturized three-axis MEMS accelerometer (similar to the BMA355) from Bosch Sensortec GmbH, Germany. The design of the sensor features a simple implantation procedure, which aims to be similar to the medical procedure of temporary pacing wire attachment. The device remained in place in the heart muscle without the need for additional attachment or fixation. The essential clinical requirements for implantable devices, especially heart implantable sensors, are also taken into account in this study. Additional safety enhancement is realized by adding a galvanic isolator, which ensures electrical safety.

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