Hemostatic Powder Cylindrical Particles Gas Exchange
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Solution Overview
Problem
Existing hemostatic powders have insufficient absorption and retention capacity for biological fluids, forming a paste that limits their effectiveness and gas exchange at wound sites.
Innovation Solution
A powder composed of cylindrical particles made from hemostatic fibers, preferably calcium alginate, which forms a three-dimensional structure for enhanced absorption and retention, ensuring gas exchange and tissue regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If spherical hemostatic powder particles are used, then the powder can be easily applied to wounds, but the absorption and retention capacity for biological fluids is insufficient and the particles form a paste that limits gas exchange
Solution Approach 1:
The invention divides the hemostatic material into cylindrical particles with specific dimensions (length 20-2000 μm, diameter 5-50 μm) rather than using spherical particles. This segmentation into elongated shapes creates inter-particle voids that maintain porosity and prevent paste formation, allowing gas exchange while increasing absorption capacity through greater surface area and capillary action along the cylindrical surfaces.
Solution Approach 2:
The cylindrical particle structure inherently creates a porous framework when applied to wounds. The elongated shape and specific size range maintain inter-particle spaces that preserve gas permeability while the porous structure of individual cylindrical particles provides capillary channels for fluid absorption and retention, solving the contradiction between absorption capacity and gas exchange.
2Quantity of substance
If the powder forms a paste to increase absorption, then absorption capacity improves, but gas exchange at the wound site is limited
Solution Approach 1:
The invention transitions from spherical (0-dimensional surface) to cylindrical (1-dimensional extended surface) particles, adding a dimensional aspect that creates vertical channels for gas exchange while maintaining horizontal absorption capacity. The cylindrical geometry provides both absorption surfaces and gas permeation pathways simultaneously, resolving the contradiction between absorption and gas exchange.
3Ease of operation
If particle diameter is less than 5 μm, then the powder can penetrate tissue effectively, but aerosol formation causes respiratory toxicity
Solution Approach 1:
The invention specifies a particle diameter range of 5-50 μm, changing the size parameter from sub-5 μm to a controlled range that prevents aerosol formation (particles larger than 5 μm do not remain suspended as aerosols) while still allowing tissue penetration through the lower end of the range (5-30 μm preferred). This parameter optimization eliminates respiratory toxicity while maintaining therapeutic effectiveness.
4Object-affected harmful factors
If particle diameter is greater than 50 μm, then respiratory toxicity is avoided, but the capacity for flow and adhesion to tissues is limited
Solution Approach 1:
The invention defines an optimal particle diameter range of 5-50 μm with a preferred range of 10-30 μm, changing the size parameter to balance adhesion and safety. Particles in this range are small enough to adhere to tissue surfaces through capillary forces and van der Waals forces, yet large enough to avoid aerosol formation and respiratory toxicity, achieving both adhesion and safety simultaneously.
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 cylindrical particle structure significantly increases absorption and retention capabilities while maintaining optimal gas exchange, facilitating wound healing and tissue repair.
Implementation Method 1
the particles of the powder of the invention form a three-dimensional structure distributing them geometrically in a ventilated manner on the surface of the wound. Thus, thanks to the particular cylindrical shape of the particles of the powder, its power of absorption and retention is notably increased
Implementation Method 2
by the gelation of its structure in contact with blood or exudates from an oozing wound, calcium alginate creates a kind of artificial skin which protects the wound
Implementation Method 3
the particles of the powder of the invention form a three-dimensional structure distributing them geometrically in a ventilated manner on the surface of the wound, ensuring gas exchange with the wound
Implementation Method 4
by the gelation of its structure in contact with blood or exudates from an oozing wound, calcium alginate creates a kind of artificial skin which protects the wound from external shocks and thermal variations
Data Source
Figure 1
AI summary
The invention relates to a powder (14) forming a dressing, which is characterized in that it is formed by a plurality of cylindrical particles that are produced from fibers. It is preferable for the particles to be hemostatic calcium alginate fibers, the length of which is between 20 mum and 2 mm and the diameter of which is between 5 mum and 50 mum.