Wearable Pressure Differential Actuator for Lymphedema
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Solution Overview
Problem
Current treatments for lymphedema, such as compression garments and pneumatic compression devices, are limited in effectiveness and unsuitable for patients with certain medical conditions, and there is no cure available for the condition, which leads to persistent swelling, discomfort, and increased risk of infections and cosmetic concerns.
Innovation Solution
A wearable device that applies alternating negative and positive pressure to the skin using a pliable base with hollow chambers connected to a pump, allowing for modulated differential pressure to stimulate lymphatic and blood circulation, improve tissue composition, and prevent fibrosis through controlled stretching of collagen fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If compression garments or pneumatic compression devices are used, then swelling can be reduced, but they are unsuitable for patients with certain medical conditions and cannot be used by all individuals
Solution Approach 1:
The device uses dynamic pressure modulation, alternating between negative pressure (vacuum) and positive pressure phases, rather than static compression. This dynamic approach allows the system to adapt to different tissue types and patient conditions while maintaining treatment effectiveness, as the pressure waveform can be adjusted based on real-time feedback from pressure sensors and tissue response.
Solution Approach 2:
The system changes multiple parameters including pressure magnitude, pressure duration, frequency of cycles, and ratio of negative to positive pressure phases. These parameter variations allow customization for different patient conditions (lymphedema, cellulite, fibrosis, wound healing) while maintaining reliable treatment outcomes across diverse patient populations.
2Productivity
If manual drainage massage techniques are used, then lymph flow can be encouraged, but the treatment is time-consuming and requires professional intervention
Solution Approach 1:
The device is designed for self-application and self-operation. Patients can independently attach the device to their body, adjust settings through a user-friendly interface, and operate it without requiring professional massage therapists or clinicians, thereby achieving both high productivity and ease of operation.
Solution Approach 2:
The manual mechanical massage action is replaced by an automated mechanical system with motors, pumps, and pressure chambers that replicate and enhance the therapeutic effects of manual drainage, significantly increasing treatment efficiency while maintaining accessibility for patients.
3Ease of manufacture
If elastic sleeves or stockings are used, then gradual compression can be provided, but they must fit properly and provide specific compression patterns that are difficult to achieve
Solution Approach 1:
The compression device is segmented into multiple independent pressure chambers that can be individually controlled. This segmentation allows precise control over compression distribution across different body regions, achieving accurate compression patterns without requiring complex garment fitting or custom manufacturing for each patient anatomy.
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 device effectively improves lymph and blood circulation, reduces swelling, and prevents fibrosis, providing a wearable and adjustable treatment for lymphedema, chronic venous insufficiency, and soft tissue fibrosis, suitable for both residential and clinical use.
Implementation Method 1
The pump is configured to provide negative pressure (that is, below ambient) or positive pressure (that is, above ambient)
Implementation Method 2
The pump is configured to provide negative pressure (that is, below ambient) or positive pressure (that is, above ambient)
Data Source
AI summary
An apparatus includes a membrane, a plurality of cup elements, and a pneumatic distribution port. The membrane has a conformable substrate and is configured for placement on a tissue site. The plurality of cup elements includes a first cup element and a second cup element. The first cup element and the second cup element are each disposed on a first side of the membrane, and each have a concave surface configured to engage tissue at the tissue site. The pneumatic distribution port has an inlet and an outlet. The outlet is coupled to the first cup element or is coupled to the first cup element and the second cup element.