A Study on Fall Prevention System in Patient Bed

Abstract

In this paper, we investigate the patient fall prevention system to prevent the patient from falling out of the bed unintentionally on the bed of the bed. Patients stay in bed for many hours of hospitalization. During the hospitalization period, patients have low controllability of the body, as compared with normal persons, and fall due to intentional movements, resulting in a fall of the patient, can be a fatal threat to the patient. Therefore, an efficient fall prevention system is required. In this paper, the distance map to the patient is generated by the distance measuring sensor on the bed of the patient, and the risk is determined by estimating the position of the patient based on the distance map. As a result, when the distance map of the dangerous area is 150 mm or more, it is determined to be dangerous, and good results are obtained.

Fig. 1. Structure of fall prevention system using loadcell

Fig. 2. Common forms and sizes of hospital beds

Fig. 3. Configuration of Patient’s chest height measurement(side view).

Fig. 4. A Scan area of fall prevention system.

Fig. 5. define of for safety and danger zone.

Fig. 6. Fall prevention system block diagram.

Fig. 7. Distance Sensing Module.void loop()

Fig. 8. Flowchart of Fall Prevention System.

Fig. 9. Korean Body size of chest Thickness.

Fig. 10. Korean body size of wall body thickness.

Fig. 11. Alarm(left: caller, Right: Display unit)

Table 1. The result of the distance measurement of empty the bed.

Table 2. Measured value when patient is area A₃.

Table 3. Measured value when patient is area A₁.

Table 4. Measured value when patient is area A₅.

Table 5. Measured values when there are patients whose body shape is different in area A3.

Table 6. A testing data of the proposed system.