Fibrin Foam Wound Dressing Segmented Delivery
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Solution Overview
Problem
Existing wound dressings using fibrinogen and thrombin often suffer from clogging issues due to high thrombin concentrations, leading to incomplete mixing and premature clotting, which can result in ineffective wound sealing and delayed healing.
Innovation Solution
A fibrin foam wound dressing is created by separately mixing fibrinogen and thrombin with air, forming two foams that are then combined to achieve a stable, viscous foam with a low density and high surface area, allowing for effective adherence to vertical surfaces and controlled clotting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high concentration of thrombin is used to achieve faster setting time, then the curing speed is improved, but the mixing completeness deteriorates and clogging occurs
Solution Approach 1:
The invention divides the single-stream mixing process into two separate streams that are combined at the dispensing tip. Fibrinogen and thrombin are delivered through separate channels, allowing independent control of each component's flow and concentration, thereby preventing premature reaction and clogging while ensuring complete mixing at the point of application.
Solution Approach 2:
The invention introduces an intermediary mixing zone at the dispensing tip where the two separate streams are combined. This intermediary structure allows controlled interaction between fibrinogen and thrombin, ensuring complete mixing without premature clotting in the delivery system.
2Speed
If high concentration of thrombin is used to achieve faster setting time, then the curing speed is improved, but the binding of growth factor to fibrin deteriorates
Solution Approach 1:
By segmenting the delivery into separate streams, the invention allows growth factor to be incorporated with fibrinogen at optimal concentrations without being exposed to high thrombin concentrations until the moment of mixing at the dispensing tip, ensuring proper binding while maintaining fast setting time.
3Manufacturing precision
If low concentration of thrombin is used to avoid clogging, then the mixing completeness is improved, but the curing speed deteriorates
Solution Approach 1:
The separate stream architecture allows using lower thrombin concentrations without compromising curing speed, because the extended mixing time in separate channels is compensated by the efficient mixing zone at the dispensing tip, achieving both complete mixing and adequate curing speed.
4Device complexity
If conventional single-stream mixing is used to simplify the device, then the device complexity is reduced, but the clogging risk increases
Solution Approach 1:
The invention uses a relatively simple dual-channel structure that segments the fibrinogen and thrombin delivery paths. This segmentation prevents clogging by avoiding premature mixing, while the overall device remains relatively simple in design and operation.
5Device complexity
If equal volumes of fibrinogen and thrombin are used to maintain conventional formulation, then the formulation simplicity is preserved, but the foam stability deteriorates
Solution Approach 1:
The invention changes the volume ratio parameter from equal volumes to optimized proportions (e.g., 2:1 or 3:1 fibrinogen to thrombin). This parameter change enables stable foam formation by controlling the reaction kinetics and gas bubble stability, while the separate stream delivery system makes this formulation change straightforward to implement.
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 fibrin foam wound dressing provides a firm, adherent seal that promotes tissue healing by controlling clotting and reducing the risk of premature or incomplete sealing, while minimizing the volume of components needed for application.
Implementation Method 1
A fibrin foam wound dressing is created by separately mixing fibrinogen and thrombin with air, forming two foams
Implementation Method 2
Upon coming into contact with each other, the fibrinogen and thrombin interact to form a tissue sealant, fibrin
Data Source
AI summary
A fibrin wound dressing is made by mixing quantities of fibrinogen solution and thrombin solution with air. The resulting foam is very light weight, and with the proper attention to the amount of thrombin, is also sufficiently viscous to rest on a vertical surface without dripping. The wound dressing may also be formulated for its ability to continue migration of healing substances, such as PDGF, from the dressing to the wound site. Thrombin substitutes, such as other clotting proteins, may be used instead of thrombin. The resulting foam may also be lyophilized or ground and lyophilized for later reconstitution. A therapeutic drug or other additive may also be added to the wound dressing.