Tri-axial Back Exercise Machine Spinal Flexion
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Solution Overview
Problem
Conventional back machines fail to effectively facilitate isolated spinal flexion and extension exercises due to their single-axis mechanics, which do not align with the spine's biomechanics, leading to inadequate strengthening of lumbar muscles and often require uncomfortable restraints, making them ineffective and impractical.
Innovation Solution
A back exercise machine designed with a tri-axial mechanism that accommodates the spine's shifting axis of rotation, allowing for natural flexion and extension without restraints, and provides adaptive resistance to target spinal muscles, incorporating a main frame with multiple pivot axes and adjustable components for user comfort and varying strength levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-axis machine is used, then the machine structure is simple, but it does not accommodate spinal mechanics and forces the torso to rotate around the hip joint instead of enabling true spinal flexion and extension
Solution Approach 1:
The machine is divided into multiple rotational segments with three distinct axes of rotation. The first axis rotates the work arm, the second axis rotates the support structure, and the third axis provides additional rotational freedom. This segmentation allows each component to move independently, accommodating the complex multi-planar motion of the spine during flexion and extension exercises.
Solution Approach 2:
The invention transitions from a single-axis (one-dimensional rotation) to a three-axis (multi-dimensional rotation) system. This dimensional expansion enables the machine to accommodate spinal motion in multiple planes simultaneously, including sagittal, frontal, and transverse planes, thereby enabling true spinal flexion and extension that mimics natural biomechanics.
2Reliability
If skeletal restraints are used to prevent pelvis rotation, then spinal motion can be controlled, but the machine becomes uncomfortable and intimidating
Solution Approach 1:
Instead of using restraints to force the user's anatomy to comply with the machine's fixed axis, the invention inverts the approach by allowing the machine to adapt to the user's natural spinal motion. The three-axis system passively accommodates pelvic rotation and spinal movement patterns, eliminating the need for uncomfortable skeletal restraints while maintaining reliable spinal motion control through biomechanical alignment.
3Device complexity
If a fixed circular rotation path is used, then the machine mechanics are simple, but it does not align with the shifting virtual axes of motion about the spine
Solution Approach 1:
The machine employs dynamic, adjustable rotation paths through its three-axis system. Rather than a fixed circular path, the work arm can rotate along variable arcs determined by the combined motion of all three axes. This dynamic capability allows the machine to adapt to the shifting virtual axes of motion that occur during spinal flexion and extension, accommodating individual anatomical variations and exercise requirements.
Data Source
AI summary
The exercise machine in the present disclosure utilizes novel machine mechanics that accommodate and adjust to the spines shifting axis of rotation. Through the use of a multiple, articulating axes a back exercise machine or device that promotes pure and isolated spinal flexion and extension with no need for mechanical anatomical restraint to succeed has been created. Using these mechanics when users attempt to extend their trunk, the device adjusts to the natural shifting axis of rotation of the spine thereby dis-involving the contribution of the hip extensor muscles. In other works, the exercise back machine of the present disclosure is designed to accommodate the complex biomechanics of the spine and to facilitate targeted strengthening of the spinal erectors and deep intrinsic spinal muscles.