Hemostatic Device Inflatable Portion Gas Dispersion
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Solution Overview
Problem
Existing hemostatic devices that use inflatable portions to control pressure at puncture sites can cause vascular occlusion due to prolonged pressure, and require manual depressurization by medical staff, which is labor-intensive and may compromise the strength of the inflatable portion.
Innovation Solution
A hemostatic device with an inflatable portion made of a resin material containing particulate portions and a space portion that allows gas dispersion, enhancing gas permeability without reducing the thickness of the inflatable portion, thereby maintaining strength and reducing pressure over time without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the inflatable portion is made of material that elongates over time, then the pressing force is reduced over time preventing vascular occlusion, but the thickness of the inflatable portion decreases reducing its strength
Solution Approach 1:
The inflatable portion is constructed as a composite material system consisting of a base material layer and a functional particle layer. The functional particles (elastomeric or shape memory polymer particles) are dispersed within or on the base material to create a composite structure that combines the elongation properties of the functional particles with the structural integrity of the base material, resolving the contradiction between thickness reduction and strength maintenance.
Solution Approach 2:
The inflatable portion incorporates particles with internal voids or porous structures that allow controlled deformation and elongation over time. These porous particles can expand, contract, or deform in response to pressure changes, enabling the pressing force to be reduced over time while the particle framework maintains the structural strength of the inflatable portion.
2Object-affected harmful factors
If manual depressurization is performed regularly, then vascular occlusion is prevented, but labor is required from medical staff
Solution Approach 1:
The inflatable portion is designed with time-dependent elongation properties that enable it to automatically reduce its internal volume and pressing force over a predetermined period without external intervention. The material's inherent viscoelastic or shape memory characteristics cause gradual deformation that naturally decreases the internal pressure, allowing the device to perform its own depressurization function.
Solution Approach 2:
The inflatable portion utilizes time-dependent parameter changes in its material properties, specifically the gradual change in dimensions and internal volume over time. This time-parameter-based design allows the pressing force to automatically decrease from an initial high value to a lower value without requiring changes in operational procedures or external control.
3Stress or pressure
If the thickness of the inflatable portion is reduced to maintain strength, then the pressing force reduction is enhanced, but the strength of the inflatable portion is compromised
Solution Approach 1:
The inflatable portion employs a composite structure where functional particles are integrated into a base material matrix. This composite architecture allows the functional particles to provide the time-dependent pressing force reduction while the base material maintains the structural strength, eliminating the need to reduce overall thickness to preserve strength.
Solution Approach 2:
The inflatable portion exhibits local quality variations through the non-uniform distribution of functional particles within the base material. Regions with higher particle concentration provide greater elongation and pressing force reduction, while regions with lower particle concentration maintain structural integrity and strength, allowing simultaneous optimization of both pressing force reduction and strength maintenance.
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 reduces pressure on the puncture site over time while maintaining the strength of the inflatable portion, preventing vascular occlusion without the need for manual depressurization, allowing for efficient hemostasis.
Implementation Method 1
a space portion formed around the particulate portion, and the space portion contains gas dispersed in the resin layer so as not to communicate between an inner surface of the resin layer and an outer surface of the resin layer
Data Source
AI summary
A hemostatic device is disclosed, which capable of favorably maintaining strength of an inflatable portion and reducing a pressing force acting on a site where bleeding is to be stopped over time to such an extent that vascular occlusion can be prevented without operation by a doctor or a nurse. The hemostatic device includes a band for wrapping around a wrist, a fastener or means for securing the band to the wrist in a wrapped state, and an inflatable portion connected to the band and inflated by being injected with a gas, in which the inflatable portion includes a resin layer made of a resin material, a particulate portion dispersed in the resin layer, and a space portion formed around the particulate portion. The space portion contains gas dispersed in the resin layer so as not to communicate between an inner surface and an outer surface of the resin layer.