Hemostatic Device Inflatable Portion Gas Permeability
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Solution Overview
Problem
Hemostatic devices with inflatable portions made of materials that stretch over time face challenges in maintaining strength and preventing vascular occlusion, as they require frequent decompression by medical personnel and can cause numbness or pain due to prolonged compression.
Innovation Solution
A hemostatic device with an inflatable portion composed of a thermoplastic material and a thermosetting elastomer region with higher gas permeability, allowing gas discharge over time without significant thickness reduction, enabling self-regulation of compressing force and interlocking with the band via welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the inflatable portion is made of material with high gas permeability to reduce internal pressure over time, then vascular occlusion is prevented, but the thickness of the inflatable portion becomes thinner and strength is compromised
Solution Approach 1:
The inflatable portion is divided into multiple regions with different material properties: a first region made of thermoplastic material for welding and structural integrity, and a second region made of thermosetting elastomer with high gas permeability for pressure reduction. This segmentation allows each region to fulfill its specific function without compromising overall performance.
Solution Approach 2:
Different regions of the inflatable portion are assigned different material qualities tailored to their specific functions. The first region uses thermoplastic material optimized for welding and strength, while the second region uses thermosetting elastomer optimized for gas permeability. This local differentiation resolves the contradiction by ensuring that gas discharge occurs through the high-permeability region without requiring the entire structure to be thin.
2Extent of automation
If the inflatable portion is made of thermosetting elastomer with high gas permeability, then gas can be discharged over time without manual decompression, but the band and inflatable portion cannot be interlocked by welding
Solution Approach 1:
The inflatable portion is segmented into a first region made of thermoplastic material suitable for welding and an interlock region also made of thermoplastic material for mechanical connection. This segmentation enables both automated gas discharge through the thermosetting elastomer region and secure interlocking through the thermoplastic regions via welding.
Solution Approach 2:
The inflatable portion uses a composite structure combining thermoplastic material and thermosetting elastomer. The thermoplastic regions provide weldability and structural connection, while the thermosetting elastomer region provides autonomous gas discharge functionality. This composite approach allows both welding interlocking and self-regulation to coexist.
3Ease of operation
If the inflatable portion is made of material that stretches over time to reduce internal pressure, then decompressing operation is simplified, but the thickness of the inflatable portion decreases and strength is compromised
Solution Approach 1:
The inflatable portion is designed to automatically discharge gas through the high-permeability thermosetting elastomer region without requiring manual intervention. This self-service mechanism maintains constant thickness and strength while reducing internal pressure over time, eliminating the need for periodic manual decompression operations.
Solution Approach 2:
The manual mechanical decompression operation (using syringes to extract gas) is replaced by a passive material-based gas discharge mechanism through the high-permeability thermosetting elastomer. This substitution eliminates the need for repeated manual operations while maintaining structural integrity through constant thickness.
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 compressing force over time, preventing vascular occlusion without manual decompression, maintaining strength and interlocking functionality, thus reducing the need for medical intervention and improving patient comfort.
Implementation Method 1
a second region (A2) formed of a thermosetting elastomer whose gas permeability is higher than that of the thermoplastic material
Implementation Method 2
The first region (A1) of the inflatable portion (40) is welded to the interlock region (21b) of the band (20)
Data Source
Figure 1
Figure 2
Figure 3(A)~3(C)
AI summary
[Problem] There is provided a hemostatic device which can satisfactorily maintain strength of an inflatable portion, which does not need to be operated by a physician or a nurse, whose compressing force acting on a site where bleeding is to be stopped can be reduced with the lapse of time to such an extent that vascular occlusion can be prevented, and in which the inflatable portion and a band are interlocked with each other by means of welding. [Means for Resolution] A hemostatic device 10 includes a band 20 for being wrapped around a wrist W, means 30 for securing the band in a state where the band is wrapped around the wrist, and an inflatable portion 40 that interlocks with the band 20, and that is inflated by injecting gas. The inflatable portion has a first region A1 formed of a thermoplastic material and a second region A2 formed of a thermosetting elastomer whose gas permeability is higher than that of the thermoplastic material. The band has an interlock region 22b which is formed of the thermoplastic material, and with which the inflatable portion interlocks. The first region of the inflatable portion is welded to the interlock region of the band.