Coxal-Sacral Rocking Chair for Sacroiliac Mobility and Low Back Pain
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Solution Overview
Problem
Existing chairs fail to effectively relieve low back pain caused by mechanical stress on the lumbar region due to insufficient movability of the sacroiliac joint, which is exacerbated by prolonged sitting postures, and existing exercise therapies require long durations to show effects.
Innovation Solution
A chair design featuring two coxal bone support portions that rock relative to a sacral bone support portion, enhancing the movability of the sacroiliac joint, and incorporating a lower-limb exercise apparatus for promoting joint mobility through foot pedaling exercises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fixed sitting posture is maintained, then stability and comfort are improved, but mechanical stress on the lumbar region increases and sacroiliac joint movability deteriorates
Solution Approach 1:
The chair transforms the fixed sitting posture into a dynamic one by enabling the seat to rock back and forth. This dynamic motion actively promotes sacroiliac joint movability and reduces mechanical stress on the lumbar region, while maintaining sitting stability through controlled rocking motion.
Solution Approach 2:
The chair implements periodic rocking motion of the seat to continuously stimulate sacroiliac joint movement. This periodic action ensures sustained reduction of lumbar mechanical stress and prevents the harmful effects of prolonged static sitting posture.
2Reliability
If exercise therapy is performed for several months, then low back pain relief is achieved, but time consumption and treatment duration increase
Solution Approach 1:
The chair performs preliminary action by continuously promoting sacroiliac joint movability during normal sitting activities. This prevents the development of lumbar mechanical stress and low back pain before they occur, eliminating the need for prolonged exercise therapy.
Solution Approach 2:
The chair enables self-service by allowing users to obtain therapeutic effects for low back pain relief during regular sitting without requiring separate exercise therapy sessions. The rocking motion automatically performs the therapeutic function that would otherwise require months of dedicated exercise treatment.
3Adaptability or versatility
If the seat rocks to promote sacroiliac joint movability, then health effect is improved, but device complexity increases
Solution Approach 1:
The chair achieves health benefits through a simple dynamic mechanism where the seat is allowed to rock back and forth. This single degree of freedom motion effectively promotes sacroiliac joint movability without requiring complex multi-axis mechanisms or active control systems.
Solution Approach 2:
The chair modifies the sitting experience by changing the static parameter of seat position into a dynamic parameter with controlled rocking amplitude and frequency. This parameter change achieves therapeutic effects while maintaining relatively simple chair structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The chair design reduces mechanical stress on the lumbar region by improving sacroiliac joint mobility, providing immediate relief from low back pain and reducing muscle fatigue, without the need for prolonged medical interventions.
Implementation Method 1
the two first support portions are configured to be able to rock in a pitch direction and a roll direction due to elastic deformation of the two elastic coupling portions
Data Source
AI summary
A chair includes: two coxal bone support balloons that support two coxal bones respectively; and a sacral bone support balloon that supports one of a sacral bone and a coccygeal bone. The two coxal bone support balloons are configured to be able to rock relative to the sacral bone support balloon. In this configuration, the movability of a sacroiliac joint between the two coxal bones and the sacral bone is improved, and therefore, the mechanical stress on a lumbar region joint, on which a load increases in compensation for an insufficient movability of the sacroiliac joint, is curbed, so that a low back pain is relieved.