Figure 3
The transfer alarming system consisting of sensors (touch, tilt, and force), a transmitters and a receiver is shown. The small box that the patient carries includes the wireless receiver, circuitry and actuator to stimulate neck muscle. The 1st transmitter mounted on the bedrail, transmits the signal from the touch sensor. The 2nd transmitter (not shown) is mounted at the back of the wheelchair and is connected to the tilt and force sensors transmitting sensors’ signal to the receiver. Tilt sensor is mounted in a small box which is placed at the tip of the extending bar connected to wheelchair’s brake. Force sensor is attached to the footrest.