Liquid Sealant for Occlusive Dressing Air-Tight Interface
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Solution Overview
Problem
Current negative pressure wound therapy (NPWT) systems face challenges with air leaks at the dressing-skin and tube-dressing interfaces, limiting mobility and requiring continuous electrical power, and lack effective air leak detection and pressure monitoring.
Innovation Solution
The development of occlusive dressings with a liquid sealant applied to create an air-tight seal at the dressing-skin and tube-dressing interfaces, using elastomeric materials and biocompatible adhesives, which can dry and cure quickly to form a continuous, impervious film, eliminating the need for electrical power and enhancing seal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional occlusive dressings are used in NPWT systems, then the system can maintain negative pressure for wound therapy, but air leaks occur at the dressing-skin and tube-dressing interfaces
Solution Approach 1:
The patent applies liquid sealant material specifically at the critical interface regions where air leaks occur (dressing-skin and tube-dressing interfaces), rather than attempting to seal the entire dressing surface. This localized application of enhanced sealing properties addresses the specific problem areas while maintaining the overall dressing structure.
Solution Approach 2:
The patent combines traditional occlusive dressing materials with liquid sealant materials to create a composite sealing system. The liquid sealant forms a continuous film that bonds to both the dressing material and skin surface, creating a multi-material seal that is more effective than either material alone.
2Duration of action of stationary object
If continuous electrical power is provided to NPWT systems, then negative pressure can be maintained continuously, but patient mobility is limited and power recharging is required
Solution Approach 1:
The patent employs disposable adhesive sections and sealant materials that can be applied and removed without requiring complex power management systems. The adhesive sections are designed to maintain the seal throughout the typical dressing change interval (approximately 3 days), after which the entire dressing is replaced rather than recharged or resealed.
Solution Approach 2:
The patent extracts the power dependency from the sealing function by using adhesive and liquid sealant materials that create permanent seals without requiring electrical power. This separates the sealing function from the powered vacuum function, allowing the vacuum system to be battery-operated or mechanically-driven while the seal remains passive and power-independent.
3Ease of operation
If adhesive sections are applied to skin, then the dressing can be secured, but adhesive failure may occur compromising the seal
Solution Approach 1:
The patent changes the physical-chemical parameters of the sealing interface by introducing liquid sealant material that cures to form a cross-linked polymer film. This transforms the sealing mechanism from relying solely on adhesive bond strength to relying on the mechanical and chemical properties of the cured sealant film, which has higher resistance to degradation from moisture and movement.
Solution Approach 2:
The patent applies liquid sealant material before the dressing is fully activated or before negative pressure is applied. This preliminary sealing action ensures that the seal is established under controlled conditions before the full therapeutic load is applied, preventing adhesive failure that might occur if sealing were attempted under stress.
4Object-affected harmful factors
If liquid sealant is applied to create air-tight seal, then air leaks are reduced, but application complexity increases
Solution Approach 1:
The liquid sealant material is designed to be self-leveling and self-curing, requiring minimal application skill. The material flows to fill gaps and irregularities automatically, then cures through ambient conditions or mild activation, eliminating the need for complex application equipment or highly trained personnel.
Solution Approach 2:
The liquid sealant acts as an intermediary material between the dressing and skin surfaces, simplifying the overall application process. Rather than requiring precise alignment and pressing of adhesive edges, the liquid sealant can be applied more freely and will self-form the sealing interface, mediating between imperfect surfaces to create a reliable seal.
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 solution significantly reduces air leaks, increases the duration of NPWT without power recharging, allows for more flexible and ergonomic dressing applications, and minimizes the risk of exsanguination, enabling more widespread and cost-effective NPWT.
Implementation Method 1
The sealant as delivered being at least partially cross-linked at least after one of drying and curing
Implementation Method 2
The sealant as delivered being at least partially cross-linked at least after one of drying and curing
Implementation Method 3
a drape formed as a thin sheet of an organic, preferably elastomeric material
Implementation Method 4
A biocompatible adhesive is at least one of (1) disposed on at least the first surface of the drape and (2) capable of contacting at least a portion of at least the first surface of the drape
Data Source
AI summary
Occlusive tissue dressings and methods including an elastomeric drape and a liquid component, at least partially cross-linked at least after one of drying and curing, suitable for application at a dressing-to-skin interface in order to create a substantially air-tight seal. The same or a different liquid component may be applied by a user at a tube-to-dressing interface in order to create a similar air-tight seal around the tube, if not occlusively sealed during its manufacture.