Design and fabrication of a new chest compression device with a specialized piston and bayonet lock mechanism

Cardiopulmonary Resuscitation (CPR) is a medical intervention to address Cardiac Arrest and effective chest compressions that increase blood flow to vital organs are critical for CPR to be successful. According to the American Heart Association (AHA) guidelines, manual CPR is recommended. However, many CPR devices have recently been developed to achieve more consistent chest compressions. In this study, a portable, small, and compact mechanical CPR device with a unique piston mechanism consisting of a double slider crank and dynamic conrod, unlike the piston mechanisms of existing devices, has been designed and manufactured. For the device called CardiS to be integrated into the patient quickly and effortlessly, on the other hand, an automatic bayonet lock system with radial and axial locking functions has been developed. Thanks to this lock system, which does not require any alignment and provides locking with lower force, fast installation, a crucial parameter for CPR devices, can be easily performed. This device has been compared with the LUCAS II device regarding standard CPR parameters and compression timings using a special CPR manikin called CPR Lilly Pro+. The results indicate that both devices successfully met the standard CPR parameters specified in the AHA guidelines, but the CardiS provided a more consistent compression depth. Furthermore, the average return time of blood to the heart has been 400.4 ms for CardiS and 299.7 ms for the LUCAS II device. This longer return time allows the heart to fill better and pump more effectively.