Systems and methods for actuating a prosthetic ankle based on a relaxed position

• US 7,896,927 B2
• Filed: 03/01/2006
• Issued: 03/01/2011
• Est. Priority Date: 02/12/2004
• Status: Active Grant

• Current Assignee: Ossur hf
• Original Assignee: Ossur hf
• Inventors: Ragnarsdottir, Heidrun G., Jonsson, Helgi, Clausen, Arinbjörn V.
• Primary Examiner(s): Isabella; David
• Assistant Examiner(s): Woznicki; Jacqueline
• Application Number:
  US11/367,049
• Publication Number:
  US 20060224247A1
• Time in Patent Office: 1,826 Days
• Field of Search: 623/24, 623/27
• US Class Current: 623/27
• CPC Class Codes: A61F 2/66 Feet; Ankle joints
• CPC Class Codes: A61F 2/6607 Ankle joints
• CPC Class Codes: A61F 2/70 electrical
• CPC Class Codes: A61F 2/72 Bioelectric control, e.g. myoelectric
• CPC Class Codes: A61F 2002/5018 for adjusting angular orientation
• CPC Class Codes: A61F 2002/5073 Helical springs, e.g. having at least one helical spring
• CPC Class Codes: A61F 2002/6642 Heels
• CPC Class Codes: A61F 2002/6685 S-shaped
• CPC Class Codes: A61F 2002/701 operated by electrically controlled means, e.g. solenoids or torque motors
• CPC Class Codes: A61F 2002/704 computer-controlled, e.g. robotic control
• CPC Class Codes: A61F 2002/705 Electromagnetic data transfer for implantable prostheses A61F2250/0002
• CPC Class Codes: A61F 2002/7625 for measuring angular position
• CPC Class Codes: A61F 2002/7635 for measuring force, pressure or mechanical tension
• CPC Class Codes: A61F 2002/764 for measuring acceleration
• CPC Class Codes: A61F 2002/7645 for measuring torque, e.g. hinge or turning moment, moment of force

Abstract

Systems and methods for sensing actuating a prosthetic ankle are disclosed. In one example, the system, such as an actuated prosthetic ankle joint, detects that the user has moved to a relaxed position, such as sitting, reclining, crawling, or leaning. In response, the actuated prosthetic ankle joint actively adjusts the angle between the members of the ankle to a relaxed state. The system may further detect when the user has moved to exit the relaxed position, and may actively adjust the angle between the members of the ankle to an exit state.

Claims

1. A method for adjusting a prosthetic ankle device, the method comprising:

monitoring with at least one sensor the movement of a user of a prosthetic ankle device;

generating data indicative of the movement;

processing the data with a processing module to determine whether the user is in a relaxed position, wherein the relaxed position is a sitting position; and

adjusting the prosthetic ankle device based on whether the user is in the relaxed position, wherein adjusting the prosthetic ankle device comprises automatically adjusting a configurable element of the prosthetic ankle device.

2. The method of claim 1, wherein the at least one sensor is located on the prosthetic ankle device.

3. The method of claim 1, wherein monitoring with the at least one sensor the movement of the user of the prosthetic ankle device comprises monitoring an angle of the prosthetic ankle device relative to a ground surface.

4. The method of claim 3, wherein the prosthetic ankle device is adjusted when the angle of the prosthetic device relative to the ground surface is between about 30 and −

90 degrees.

5. The method of claim 1, wherein monitoring with the at least one sensor the movement of the user of the prosthetic ankle device comprises monitoring an acceleration of the prosthetic ankle device.

7. The method of claim 1, wherein monitoring with the at least one sensor the movement of the user of the prosthetic ankle device comprises monitoring a length of time that the user of the prosthetic ankle device exhibits a movement characteristic indicative of the relaxed position of the user.

9. The method of claim 1, wherein the prosthetic ankle device comprises a prosthetic foot and a limb member movably connected at a location about a natural human ankle joint, and wherein the configurable element is the angle between the prosthetic foot and the limb member.

11. The method of claim 1, wherein the configurable element is the amount of operating power.

12. The method of claim 1, further comprising adjusting the prosthetic ankle device based on whether the user is in an exit position, wherein adjusting the prosthetic ankle device comprises automatically adjusting a configurable element of the prosthetic ankle device.

6. A method for adjusting a prosthetic ankle device, the method comprising:

monitoring with at least one sensor the movement of a user of a prosthetic ankle device, wherein monitoring with the at least one sensor the movement of the user of the prosthetic ankle device comprises monitoring an acceleration of the prosthetic ankle device and wherein the prosthetic ankle device is adjusted when the acceleration is less than about 1 m/s²;

generating data indicative of the movement;

processing the data with a processing module to determine whether the user is a relaxed position; and

adjusting the prosthetic ankle device based on whether the user is in the relaxed position, wherein adjusting the prosthetic ankle device comprises automatically adjusting a configurable element of the prosthetic ankle device.

8. A method for adjusting a prosthetic ankle device, the method comprising;

monitoring with at least one sensor the movement of a user of a prosthetic ankle device, wherein monitoring with the at least one sensor the movement of the user of the prosthetic ankle device comprises monitoring a length of time that the user of the prosthetic ankle device exhibits a movement characteristic indicative of a relaxed position of the user and wherein the prosthetic ankle device is adjusted when the length of time exceeds about 1 second;

generating data indicative of the movement;

processing the data with a processing module to determine whether the user is in the relaxed position; and

adjusting the prosthetic ankle device based on whether the user is in the relaxed position, wherein adjusting the prosthetic ankle device comprises automatically adjusting a configurable element of the prosthetic ankle device.

10. A method for adjusting a prosthetic ankle device, the method comprising:

monitoring with at least one sensor the movement of a user of a prosthetic ankle device;

generating data indicative of the movement;

processing the data with a processing module to determine whether the user is in a relaxed position; and

adjusting the prosthetic ankle device based on whether the user is in the relaxed position, wherein adjusting the prosthetic ankle device comprises automatically adjusting a configurable element of the prosthetic ankle device,

wherein the prosthetic ankle device comprises a prosthetic foot and a limb member movably connected at a location about a natural human ankle joint, and wherein the configurable element is the angle between the prosthetic foot and the limb member, and wherein automatically adjusting the configurable element of the prosthetic ankle device comprises moving the prosthetic ankle device to approximately fifteen degrees of plantarflexion from a neutral position.