Intelligent body support

• US 5,827,209 A
• Filed: 11/25/1996
• Issued: 10/27/1998
• Est. Priority Date: 09/23/1994
• Status: Expired due to Fees

• Current Assignee: Bcam International, Inc. (CellMetrix, Inc.)
• Original Assignee: Bcam International, Inc. (CellMetrix, Inc.)
• Inventors: Gross, Clifford M.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): LEWIS, KIM M
• Application Number:
  US08/755,199
• Time in Patent Office: 701 Days
• Field of Search: 602/13, 602/20, 602/23, 602/26, 602/60, 602/62, 600/595, 600/587, 607/201, 607/202, 607/203
• US Class Current: 602/19
• CPC Class Codes: A61B 5/1121 Determining geometric values, e.g. centre of rotation or angular range of movement
• CPC Class Codes: A61B 5/1126 using a particular sensing technique
• CPC Class Codes: A61B 5/389 Electromyography [EMG]
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 5/486 Bio-feedback A61B5/375 takes precedence
• CPC Class Codes: A61F 5/012 inflatable

Abstract

An automatic feedback and adjustment setup is integrally connected to a body joint support. The support may be of the flexible, semi-rigid, or rigid type. The support contains one or more inflatable/deflatable bladders, each bladder individually controlled by a hydraulic pump. Sensors embedded in the support monitor muscle activity (EMG) and transmit those electronic measurements to a microprocessor which processes the measurements according to one of a variety of prestored algorithms. The result of this processing is compared to preset minimum and maximum levels. The inflation level of each bladder is then automatically adjusted by activating the hydraulic pumps to keep the calculated level between these preset minimum and maximum. The combination of support, bladders, sensors, microprocessor, comparison device, and hydraulic pumps creates a closed-looped biofeedback system for controlling the degree of joint stress the person is experiencing while wearing the support. Thus, the likelihood of joint, muscular, or soft tissue damage can be minimized. Also disclosed is a method for using the support.

Claims

1. An apparatus for automatically monitoring and controlling a relative level of movement within a body joint, comprising:

a joint support configured for contact with at least a portion of the body joint, the support comprising;

at least one inflatable bladder configured to apply variable pressures to predetermined areas of the body joint;

a plurality of sensors, integrally placed on a plurality of predetermined locations of the joint support and in contact with predetermined positions on the body joint, said sensors being configured to monitor movement of the body joint in the region of said predetermined locations over a variety of angular orientations with respect to said support through a range of motion of the body joint;

said sensors being further configured for establishing and sending an electronic signal representing said monitored movement of the body joint;

a processor electronically connected to said sensors, said processor configured to receive and convert said electronic signals from said sensors into a joint movement value, compare said joint movement value to predetermined joint movement values selected such that the body joint is supported through a range of motion of the body joint; and

a pressure control device connected to said processor and said at least one inflatable bladder, said pressure control device adjusting pressure within said at least one inflatable bladder to substantially maintain said predetermined joint movement value.

2. Apparatus as described in claim 1 in which:

(a) the pressure control device comprises a pump; and

(b) the pressure control device comprises pump control means to control the pump, thereby adjusting the level of inflation;

the pump control means being electronically connected to the processor and the pump.

3. Apparatus as described in claim 1 in which:

(a) the joint support and at least one inflatable bladder comprise a material having a stiffness that is controllable by the application of an electrical signal or field; and

(b) the pressure control device comprises material control means to apply the electrical signal or field to the material, thereby adjusting the stiffness of the material;

the material control means being electronically connected to the processor and the material.

4. Apparatus as described in claim 1 in which the joint movement value comprises a root mean square representation of the electronic signals from the sensors.

5. Apparatus as described in claim 1 in which the joint movement value comprises a filtered representation of the electronic signals from the sensors.

6. Apparatus as described in claim 1 in which the joint movement value comprises a filtered representation of the electronic signals from the sensors.

7. Apparatus as described in claim 1 in which the predetermined joint movement values comprise a maximum joint movement value and a minimum joint movement value.

8. Apparatus as described in claim 1 in which said sensors are further configured to measure skin pressure proximate said body joint.

9. Apparatus as described in claim 1 in which said sensors are further configured to measure strain in said body joint.

10. Apparatus as described in claim 1 in which said sensors are further configured to measure joint velocity.

11. Apparatus of claim 1 in which the pressure applied to the body joint comprises a predetermined pressure required to adequately support the body joint and concurrently allow permissible body joint movement.

12. A method of automatically controlling a relative level of motion in a body joint, utilizing a joint support being placeable in contact with the body joint, the support exerting a pressure against the body joint during movement of the body joint, the support being automatically adjustable to vary the pressure;

the method comprising;

(a) establishing an upper limit of desired motion and a lower limit of desired motion for the body joint during movement of the body joint;

(b) creating an acceptable range of motion for the body joint bounded by the upper limit and the lower limit;

(c) making a measurement of signals from a plurality of sensors distributed within the joint support across the body joint, the signals being representative of the movement of the body joint at a specific time;

(d) processing the signals to form a data value representative of the position of the body joint at the specific time;

(e) determining whether the position of the body joint, as represented by the data value, is within the acceptable range of motion; and

(f) if the data value does not represent an acceptable position of the body joint, automatically adjusting the pressure such that movement of the body joint is within the range of motion.