Effectiveness of the VND Prevention Device Using Magnets

Venous needle dislodgment (VND) during hemodialysis can cause a great risk of life-threatening severe blood loss. If the medical staff or the hemodialysis machine does not detect the bleeding, patient can bleed to death. In order to perform dialysis treatment safely, prevention of VND is important. Accordingly, this study examined the effectiveness of the VND prevention device using magnets. We examined the following three items to evaluate the effectiveness of the device for the VND prediction. Study of the linearity and the stability, and change in the magnetic flux density value due to the direction of the magnet’s motion. A study provided the following results. When the distance between the magnet and sensor was within 40 mm, strong correlation was observed between the distance and the linear value. When the distance between the sensor and magnet was consistent, the measurement was stable even with the perturbation. The variability in the linear values was observed depending on the direction of magnet’s motion. This study provided the basic capability of the device. The device was able to accurately and consistently measure the motion of the needle. But in order to effectively use this device, the location of the needle insertion site, the location of the sensor, the possible directions of the needle dislodgment should be carefully considered.