Viscoelastic Compression Sleeve for Dynamic Pressure Management
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Solution Overview
Problem
Compression sleeves require a balance between elasticity for easy application and stiffness for therapeutic pressure, but traditional materials fail to provide the necessary viscoelastic properties to effectively support venous blood return and manage edema, especially during rapid muscle movements and slow conformability changes.
Innovation Solution
A compression sleeve with a fabric comprising viscoelastic strands that exhibit both elastic and viscous behavior, providing higher resistance to rapid deformation and lower resistance to slow deformation, achieved through a specific balance of storage and loss moduli and glass transition temperature within the range of human body temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional elastic materials are used in compression sleeves, then the sleeve can be easily applied to the limb, but the sleeve lacks sufficient stiffness to provide effective therapeutic pressure during muscle movements
Solution Approach 1:
The patent applies parameter changes by incorporating viscoelastic strands with specific glass transition temperatures within the human body temperature range into the fabric. This changes the material's mechanical parameters dynamically, allowing it to exhibit high elasticity at low strain rates (during application) and high stiffness at high strain rates (during muscle movements), thus resolving the contradiction between ease of application and therapeutic effectiveness
Solution Approach 2:
The patent uses composite materials by combining viscoelastic strands with traditional elastic fibers in the fabric construction. This composite structure integrates the beneficial properties of both material types: the viscoelastic strands provide rate-dependent stiffness while the elastic fibers ensure ease of application, effectively resolving the contradiction between softness for application and stiffness for therapy
2Ease of operation
If traditional elastic materials are used in compression sleeves, then the fabric remains compliant for easy application, but it cannot provide higher resistance to rapid deformation during muscle movements
Solution Approach 1:
The viscoelastic strands exhibit parameter changes based on strain rate, showing high compliance at low strain rates during application and high resistance to rapid deformation at high strain rates during muscle movements, directly resolving this technical contradiction
3Reliability
If the compression sleeve is made stiffer to support venous blood return during walking, then therapeutic pressure is improved, but the sleeve becomes difficult to apply and remove
Solution Approach 1:
The viscoelastic material's parameter changes with strain rate allow the sleeve to be soft and compliant during application (low strain rate) but stiff and supportive during muscle movements and walking (high strain rate), effectively resolving the contradiction between reliability of venous support and ease of operation
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 viscoelastic fabric ensures high short-term stiffness for therapeutic pressure during muscle movements while maintaining compliance for easy application and reduced resting pressure, effectively supporting venous blood return and managing edema.
Implementation Method 1
the fabric comprising viscoelastic strands for providing the fabric with viscoelastic properties. Viscoelasticity combines elastic and viscous behaviour of materials. Materials having viscoelastic properties provide higher resistance against rapid deformation
Implementation Method 2
The elastic properties of the viscoelastic fabric generally provide for its ability to immediately strive to recover its original length after being elongated
Implementation Method 3
The viscous properties of the viscoelastic fabric generally provide for increasing resistance to elongation when the fabric is stretched at increasing speeds
Data Source
AI summary
Compression sleeve (1) for application circumferentially around a human limb (10) to exert therapeutic pressure on the limb. The compression sleeve has a fabric (80), which comprises viscoelastic strands (90) for providing the fabric with viscoelastic properties.