A SYSTEM AND METHOD FOR EVALUATING RANGE OF MOTION OF A SUBJECT

• US 20150335271A1
• Filed: 01/07/2014
• Published: 11/26/2015
• Est. Priority Date: 01/11/2013
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips N.V.
• Inventors: LIN, Hong, JIA, Yugang
• Granted Patent: US 11,020,024 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2505/05 Surgical care
• CPC Class Codes: A61B 2505/09 Rehabilitation or training
• CPC Class Codes: A61B 5/0077 Devices for viewing the surface of the body, e.g. camera, magnifying lens
• CPC Class Codes: A61B 5/1121 Determining geometric values, e.g. centre of rotation or angular range of movement
• CPC Class Codes: A61B 5/1127 using markers

Abstract

The present invention provides a system and method for evaluating Range of Motion of a subject. An aspect of the present invention proposes a system for evaluating Range of Motion of a subject, comprising markers attached to at least two joints of a body part of the subject respectively; an image capturing device for capturing images of the markers when the subject is doing an exercise with the body part attached with the at least two markers; and an evaluating device communicated with the image capturing device, wherein the evaluating device includes a determining unit configured to determine whether the exercise done by the subject is valid for the evaluation of Range of Motion of the body part of the subject, and a calculating unit configured to, if the exercise is valid, calculate the parameters related to Range of Motion of the body part of the subject according to the images related to the valid exercise. Thus, the work load of clinicians can be greatly reduced during the process of evaluating Range of Motion, and the accuracy of the evaluation of Range of Motion can be improved as well.

Claims

1. A system for evaluating Range of Motion of a subject comprising:

markers configured to be attached to at least two joints of a body part of the subject respectively;

an image capturing device for capturing images of the markers when the subject is doing an exercise with the at least two markers attached to the body part; and

an evaluating device configured to communicate with the image capturing device, wherein the evaluating device includes a determining unit configured to determine whether the exercise done by the subject is valid for the evaluation of Range of Motion of the body part of the subject, and a calculating unit configured to, if the exercise is valid, calculate the parameters related to Range of Motion of the body part of the subject according to the images related to the valid exercise.

2. The system of claim 1, further comprising a user interface for receiving a signal according to which the evaluating device determines whether the exercise is valid.

3. The system of claim 1, wherein the calculating unit is configured to calculate said parameters according to the coordinates of the markers obtained when the body part is in the maximum movement position and/or the coordinates of the markers obtained when the body part is in the initial position.

4. The system of claim 1, wherein the determining unit comprises:

first subunit for setting standard movement track of one of the joints based on the coordinates of the markers obtained when the body part is in the initial position, and

second subunit for determining whether the exercise is valid according to the distance offset between the coordinate of the marker attached to the one of the joints obtained when the body part is in the maximum movement position and a corresponding coordinate in the standard movement track.

5. The system of claim 1, wherein the determining unit comprises subunit for determining whether the exercise is valid according to the time during which the body part keeps in the maximum movement position.

6. The system of claim 1, wherein the determining unit comprises subunit for determining whether the exercise is valid according to the speed of doing the exercise.

7. A method of evaluating Range of Motion of a subject, wherein markers are attached to at least two joints of a body part of the subject respectively, comprising the steps of:

a) capturing images of the markers by an image capturing device when the subject is doing an exercise with the body part attached with the at least two markers;

b) determining whether the exercise done by the subject is valid for the evaluation of Range of Motion of the body part of the subject; and

c) calculating the parameters related to Range of Motion of the body part of the subject according to the images related to the valid exercise if the exercise is valid.

8. The method of claim 7, wherein the determining step comprises a step of receiving from a user interface a signal indicating whether the exercise is valid.

9. The method of claim 7, wherein the calculating step comprises a step of calculating said parameters according to the coordinates of the markers obtained when the body part is in the maximum movement position and/or the coordinates of the markers obtained when the body part is in the initial position.

10. The method of claim 7, the step of determining comprising steps of:

setting standard movement track of one of the joints based on the coordinates of the markers obtained when the body part is in the initial position, and

determining whether the exercise is valid according to the distance offset between the coordinate of the marker attached to the one of the joints obtained when the body part is in the maximum movement position and a corresponding coordinate in the standard movement track.

11. The method of claim 7, the step of determining comprising determining whether the exercise is valid according to the time during which the body part keeps in the maximum movement position.

12. The method of claim 7, the step of determining comprising determining whether the exercise is valid according to the speed of doing the exercise.