Hip CPM Machine with Rotational Circumduction
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Solution Overview
Problem
Current post-operative hip joint rehabilitation devices lack the ability to provide rotational motion of hip circumduction, necessitating reliance on physical therapists and inadequate home-based solutions, leading to poor compliance and suboptimal outcomes.
Innovation Solution
A continuous passive movement device that allows for both linear hip flexion/extension and rotational hip circumduction, enabling multidimensional movement of the patient's leg, reducing dependence on external professionals and providing comprehensive therapy in a single, adjustable, and portable unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a knee CPM machine is used to provide linear hip flexion/extension movement, then linear motion is achieved, but rotational hip circumduction motion is not provided
Solution Approach 1:
The hip CPM machine is designed to perform multiple functions: it provides both linear hip flexion/extension movement and rotational hip circumduction movement through an integrated mechanism. The device combines a linear actuator with a rotational mechanism, allowing a single device to deliver comprehensive hip rehabilitation motion that previously required multiple separate interventions
Solution Approach 2:
The device transitions from providing only linear one-dimensional movement to delivering three-dimensional circumduction motion by adding rotational capability. The arm mechanism rotates around the hip joint center while simultaneously moving the leg through flexion/extension, creating orbital circumduction paths that address full hip mobility in multiple planes
2Reliability
If physical therapists provide hip circumduction motion in office settings, then proper rotational motion is achieved, but treatment frequency is limited to 3 sessions per week
Solution Approach 1:
The hip CPM machine enables patients to independently perform hip circumduction exercises at home without requiring physical therapist assistance. The automated mechanism provides controlled rotational and linear motion, allowing patients to complete multiple treatment sessions daily (6+ times) rather than being limited to scheduled office visits
Solution Approach 2:
The device enables continuous passive movement to be performed repeatedly throughout the day at home, rather than as intermittent supervised sessions. Patients can complete multiple 20-minute sessions daily, accumulating the required 4-6 hours of CPM use without interruption by travel or scheduling constraints
3Productivity
If home caregivers perform hip circumduction motion manually, then treatment can be provided frequently, but compliance is poor due to physical strain and lack of training
Solution Approach 1:
The device replaces the manual mechanical effort previously required from caregivers with an automated motorized mechanism. The motor-driven arm provides controlled linear and rotational motion, eliminating the need for caregivers to physically lift and maneuver the patient's leg through the full range of motion
Solution Approach 2:
The automated hip CPM machine allows patients to independently operate the device without caregiver assistance. Patients can set up the device, adjust parameters, and complete their rehabilitation sessions autonomously, eliminating the dependency on trained home caregivers and significantly improving compliance
4Adaptability or versatility
If the Mamaroo device is used to provide hip circumduction, then some rotational motion is achieved, but the device provides only minimal rotation and requires unsafe positioning on the floor
Solution Approach 1:
The hip CPM machine provides full three-dimensional circumduction motion with adequate rotational range, unlike the Mamaroo which only provides minimal rotation. The controlled orbital movement in multiple planes delivers therapeutically effective hip motion without compromising safety
Solution Approach 2:
The device is designed to be used safely in a supine position on a bed or table, eliminating the need for patients to position themselves on the floor. The mechanical design supports the leg throughout the full range of motion without requiring weight-bearing or unstable positioning
Data Source
AI summary
A method and device or machine for safely providing or performing the motion of circumduction as well as linear hip flexion/extension to a patient in need is provided. The device or machine (used interchangeable herein) is preferably a continuous passive movement device. The device gives full support to the operative leg and controls the true amount of hip external/internal rotation by keeping the hip in a neutral position, relative to rotation. In operation, the patient is typically in a side-lying position with the operative leg on top. In this position, the motion of circumduction as well as linear hip flexion/extension can then be performed on the patients safely and effectively. Other positions of the patient can be used and will usually be patient specific.