Fall prevention system having a sensor for determining an indication of the risk of a fall

1. A fall prevention system that is suitable for being worn by a user, comprising:

a sensor configured to determine an indication of the risk of the user falling;

two or more feedback devices configured for attachment to different parts of the user's body having different levels of sensitivity to feedback, each feedback device being controllable to apply the feedback to said respective part; and

a controller configured to in response to the determined indication, control the feedback devices such that the feedback is applied to a more sensitive part of the user's body when the indication of the risk of the user falling is relatively high, and such that feedback is applied to a less sensitive part of the user's body when the indication of the risk of the user falling is relatively low.

2. A fall prevention system that is suitable for being comprising:

a sensor configured to determine an indication of a risk of the user falling;

two or more tactile feedback devices configured for attachment to different parts of a body of the user, the user's body including a higher part and a lower part, each of the feedback devices being controllable to apply the tactile feedback to one of the upper and lower parts of the user's body; and

a controller configured to control the two or more feedback devices such that the tactile feedback is applied to the lower part of the user's body in the event that the indication indicates a relatively low risk of falling, and the upper part of the user's body in the event that the indication indicates a relatively high risk of falling.

3. The fall prevention system as claimed in claim 2 , wherein the two or more feedback devices are configured for attachment to respective parts of the user's body having different levels of sensitivity to said feedback.

4. The fall prevention system as claimed in claim 1 , wherein the controller is configured to control the feedback devices such that feedback is applied to more sensitive parts of the user's body as the indication of the risk of the user falling increases.

5. The fall prevention system as claimed in claim 3 , wherein each of the two or more feedback devices is configured for attachment to a one of a waist of the user, a wrist of the user, and a shoulder of the user.

6. The fall prevention system as claimed in claim 3 , wherein the controller is configured to control the feedback devices such that the feedback is applied to a more sensitive part of the user's body when the indication of the risk of the user falling is relatively high, and such that feedback is applied to a less sensitive part of the user's body when the indication of the risk of the user falling is relatively low.

7. The fall prevention system as claimed in claim 1 , comprising three or more feedback devices, wherein at least two of the feedback devices are for attachment to respective sides of a part of the user's body; the indication further indicates a direction in which the user is at risk of falling, and the controller is configured to control the three or more feedback devices such that feedback is applied to a particular side of the part of the user's body in response to the determined indication.

8. The fall prevention system as claimed in claim 1 , wherein each of the feedback devices comprises a vibrotactile feedback device.

9. A method of operating a fall prevention system that is being worn by a user, the method comprising:

attaching two or more tactile feedback devices to respective different parts of the user's body, each feedback device being controllable to apply feedback to said respective part wherein the two or more feedback device are attached to respective parts of the user's body having different levels of sensitivity to said feedback;

determining an indication of the risk of the user falling; and

controlling said feedback devices to apply feedback to one of said respective parts of the user's body in response to the determined indication.

10. The method as claimed in claim 9 , wherein the step of controlling comprises controlling the feedback devices to apply feedback to a more sensitive part of the user's body when the indication of the risk of the user falling is relatively high, and to apply feedback to a less sensitive part of the user's body when the indication of the risk of the user falling is relatively low.

11. The method as claimed in claim 9 , wherein the step of controlling comprises controlling the feedback devices such that feedback is applied to more sensitive parts of the user's body as the determined indication of the risk of the user falling increases.

12. The method as claimed in claim 9 , wherein the step of attaching comprises attaching the two or more feedback devices to a respective one of the waist of the user, a wrist of the user, and a shoulder of the user.

13. The method as claimed in claim 12 , wherein the step of controlling comprises controlling the two or more feedback devices such that feedback is applied to a lower one of the parts of the user's body in the event that the indication indicates a relatively low risk of falling, and an upper one of the parts of the user's body in the event that the indication indicates a relatively high risk of falling.

14. The method as claimed in claim 9 , wherein each feedback device is controllable to apply vibrotactile feedback to said respective part.

15. The fall prevention system as claimed in claim 1 , wherein each of the two or more feedback devices is configured for attachment to a respective one of a waist of the user, a wrist of the user, and a shoulder of the user.

16. The fall prevention system as claimed in claim 1 , wherein the controller is configured to control the two or more feedback devices such that feedback is applied to a lower one of the parts of the user's body in the event that the indication indicates a relatively low risk of falling, and an upper one of the parts of the user's body in the event that the indication indicates a relatively high risk of falling.

17. The fall prevention system as claimed in claim 2 , wherein the controller is configured to control the feedback devices such that the tactile feedback is applied to more sensitive parts of the user's body as the indication of the risk of the user falling increases.

18. The fall prevention system as claimed in claim 2 , comprising three or more feedback devices, wherein at least two of the feedback devices are for attachment to respective sides of a part of the user's body, the indication further indicates a direction in which the user is at risk of falling, and the controller is configured to control the three or more feedback devices such that feedback is applied to a particular side of the part of the user's body in response to the determined indication.

19. A fall prevention system as claimed in claim 2 , wherein each of the feedback devices comprises a vibrotactile feedback device.