Multi-Planar Passive Range of Motion Device for Hip Rehabilitation
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Solution Overview
Problem
Conventional passive range of motion devices for hip joint rehabilitation are limited to motion in a single plane, failing to provide multi-planar movement, which is believed to offer greater benefits for post-operative recovery compared to two-dimensional motion.
Innovation Solution
A passive range of motion device that includes a base, a pivoting member, a limb support, an offset member, and a drive motor, allowing for circular motion and adjustable height to facilitate multi-planar movement of the hip joint, along with optional securing straps, an offset adjustor, and a processing unit for control and data management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional PROM devices are used to provide passive motion, then the device structure remains simple and operation is straightforward, but the motion is limited to a single plane (sagittal plane) which reduces therapeutic effectiveness
Solution Approach 1:
The patent applies dimensionality change by transitioning from single-plane (sagittal) motion to multi-planar motion. The device achieves this through a circular path mechanism that combines flexion-extension motion with abduction-adduction motion, effectively adding a second dimension of movement. The offset member and circular path guide the limb support to move in a circle rather than a straight line, enabling the hip joint to undergo compound motions in multiple planes simultaneously.
2Adaptability or versatility
If the device structure is simplified for ease of manufacture, then production cost decreases, but the device cannot provide adjustable offset and height parameters needed for personalized therapy
Solution Approach 1:
The patent applies dynamics by making the device adjustable rather than fixed. The offset member can be repositioned to change the circular path radius, and the limb support height can be adjusted to accommodate different patient anatomies and therapy requirements. These dynamic adjustments are achieved through simple mechanical means such as movable joints and repositionable components that maintain ease of manufacture while providing customization capability.
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
Enables comprehensive rehabilitation by providing multi-planar motion to the hip joint, enhancing healing, reducing pain and swelling, and strengthening surrounding muscles, while allowing for remote control and data tracking for personalized therapy.
Implementation Method 1
a drive motor coupled to the offset member
Implementation Method 2
a pivoting member rotationally coupled to the base; a limb support having a first end and a second end, the first end of the limb support hingedly coupled to the pivoting member
Data Source
AI summary
A passive range of motion device is disclosed. The passive range of motion device is configured to deliver passive rotational motion to a joint, such as a hip joint. Although the use of passive range of motion devices to deliver postoperative physical therapy to hip or shoulder joints is widespread, these devices deliver motion therapy in only one plane. The hip and shoulder joints, however, allowing motion of the leg or arm in multiple planes. A device for delivering passive range of motion therapy in multiple planes to a joint, such as a hip joint or a shoulder joint, is described. The device may have a processing unit for storing user information and device status information. The device may be controlled by a controller attached to the device, or remotely, such as by a remote desktop computer or a mobile computing device.