Elliptical Resistance Exercise Device for Forearm Eccentric Control
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Solution Overview
Problem
Existing exercise devices, such as the one disclosed in U.S. Pat. No. 5,709,637, do not effectively address the need for eccentric control and strengthening of the lower portion of the upper extremity, particularly for conditions like pronator syndrome, tennis elbow, and golfer's elbow, during rehabilitation and physical therapy.
Innovation Solution
An exercise device with an elliptical and asymmetrical design, featuring a bisected working circle and resistance band, provides eccentric exercise by varying resistance through different quadrants, enhancing wrist and forearm strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular and symmetrical resistance device is used, then the device structure is simple and easy to manufacture, but it cannot provide effective eccentric control for strengthening the lower portion of the upper extremity
Solution Approach 1:
The patent applies asymmetry by transitioning from a circular, symmetrical resistance device to an elliptical, asymmetrical design. The elliptical shape creates varying resistance throughout the rotational range, with the major axis providing greater resistance in specific quadrants. This asymmetrical geometry enables eccentric control for strengthening the lower portion of the upper extremity while maintaining a relatively simple single-piece construction.
2Ease of operation
If resistance is constant throughout the rotation, then the device is simple to operate, but it does not provide varying resistance needed for effective rehabilitation of wrist and forearm
Solution Approach 1:
The patent applies local quality by creating non-uniform resistance distribution around the elliptical perimeter. The resistance band interacts with the elliptical shape to provide varying resistance forces at different angular positions. The major and minor axes of the ellipse create zones of higher and lower resistance, allowing targeted strengthening of specific muscle groups in the wrist and forearm during different phases of rotation.
3Ease of manufacture
If the device uses a symmetrical circular design, then manufacturing is easier, but it cannot address the specific needs of pronator syndrome, tennis elbow, and golfer's elbow rehabilitation
Solution Approach 1:
The patent applies asymmetry by transitioning from a circular, symmetrical resistance device to an elliptical, asymmetrical design. The elliptical shape creates varying resistance throughout the rotational range, with the major axis providing greater resistance in specific quadrants. This asymmetrical geometry enables eccentric control for strengthening the lower portion of the upper extremity while maintaining a relatively simple single-piece construction.
Data Source
AI summary
A method for treating pronator syndrome involves selecting an arm and positioning it with the forearm perpendicular to the upper arm. The hand of the arm is engaged with a grip located inside a bisected working circle, which has an outer perimeter consisting of four quadrants. The fourth quadrant is elliptical and asymmetrical to the others. The grip is designed for hand engagement and includes two d-shaped slots. A resistance band is attached to the body, with one end in the groove, creating tension when used. To exercise the arm, the body is rotated in one direction to increase tension on the band. Releasing tension is achieved by rotating the body in the opposite direction.