Apparatus for obtaining a body limb torque signal

• US 4,909,262 A
• Filed: 01/31/1989
• Issued: 03/20/1990
• Est. Priority Date: 01/31/1989
• Status: Expired due to Fees

• Current Assignee: Orthopedic Systems, Inc.
• Original Assignee: Orthopedic Systems, Inc.
• Inventors: Lamb, Steven, Halpern, Alan A.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/304,167
• Time in Patent Office: 413 Days
• Field of Search: 128/774, 128/782, 73/379-381, 33/511-512, 33/515
• US Class Current: 600/587
• CPC Class Codes: A61B 5/1107 Measuring contraction of parts of the body, e.g. organ, muscle apparatus for measuring work or force in general G01L
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 5/6828 Leg
• CPC Class Codes: A61B 5/702 Posture restraints

Abstract

An apparatus utilizing a clamp mechanism for holding a rotating body limp. A mechanical arm is linked to the clamp mechanism and rotatably connects to a pivot member. The angular rotation of the mechanical arm about the pivot member is measured simultaneously with force exerted by the rotating body limb on the clamp mechanism. A strain gage is linked to the clamp mechanism to provide such force measurement.

Claims

1. An apparatus for obtaining a signal representing a measurement of the torque produced by a rotating biological limb, comprising:

a. clamp means for holding the rotating biological limb;

b. an arm, including means linking said arm to said clamp means;

c. a pivot member, said arm rotatably connected to said pivot member;

d. means for measuring the angular rotation of said arm about said pivot member;

e. means for measuring the force exerted by the rotating biological limb on said clamp means simultaneously with said measurement of the angular rotation of said arm, said means including a strain gage linked to said clamp means.

2. The apparatus of claim 1 in which additionally comprises regulating means for providing mechanical resistance to said rotation of said arm.

3. The apparatus of claim 2 in which said regulating means for providing mechanical resistance to said rotation of said arm includes a hydraulic cylinder mechanically linked to said strain gage.

4. The apparatus of claim 3 which further comprises adjusting means for determining the level of mechanical resistance provided by said regulating means.

5. The apparatus of claim 4 in which said adjusting means includes valve means for controlling the flow of hydraulic fluid through said hydraulic cylinder.

6. The apparatus of claim 5 which additionally comprises a platform, said clamp means pivotally connected to said platform and said pivot member being connected to said platform.

7. The apparatus of claim 1 in which said means linking said arm to said clamp means includes an appendage pivotally attached to said arm and pivotally attached to said clamp means.

8. The apparatus of claim 7 which additionally comprises regulating means for providing mechanical resistance to said rotation of said arm.

9. The apparatus of claim 8 which additionally comprises a platform, said clamp means pivotally connected to said platform.

10. The apparatus of claim 9 in which said clamp means is pivotally connected to said platform, and said pivot member is connected to said platform.

11. The apparatus of claim 10 in which said regulating means includes a hydraulic cylinder mechanically linked to said strain gage and valve means for controlling the flow of hydraulic fluid through said hydraulic cylinder.

12. The apparatus of claim 11 in which said valve means is mounted on said platform.