Endotracheal Catheter Adsorption Reduction
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Solution Overview
Problem
Standard endo-tracheal catheters made from PVC materials exhibit substantial adsorption of anesthetic agents like Propofol, leading to inaccurate concentration measurements due to adsorption effects, which can delay and reduce signal strength in exhaled air monitoring during anesthesia procedures.
Innovation Solution
Incorporating an insert tube or coating with reduced adsorption characteristics, such as PTFE, PFA, FEP, or PEEK, within the catheter tube to prevent direct contact between the gaseous flow and the PVC tubular wall, allowing for accurate substance concentration measurement by minimizing adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a PVC catheter tube is used for cost-effective production, then manufacturing cost is reduced, but adsorption of anesthetic agents increases causing measurement inaccuracy
Solution Approach 1:
The catheter system is divided into two functional segments: the outer catheter tube (made from cost-effective PVC) and the inner insert tube (made from low-adsorption material). This segmentation allows each component to fulfill its specific function - the outer tube provides structural integrity and cost efficiency, while the inner tube ensures accurate substance concentration measurement by preventing adsorption of anesthetic agents.
Solution Approach 2:
The insert tube acts as an intermediary element between the gaseous flow containing anesthetic agents and the PVC catheter tube wall. It mediates the interaction by providing a surface that does not adsorb anesthetic agents, thereby preventing the harmful adsorption effect while allowing the PVC outer tube to maintain its cost-effective manufacturing advantage.
2Ease of manufacture
If PVC material is used for the catheter tube, then production cost decreases, but adsorption effects delay and reduce signal strength
Solution Approach 1:
The catheter is segmented into an outer PVC tube for cost-effective production and an inner insert tube made from low-adsorption material. This segmentation eliminates the time delay caused by adsorption while maintaining the cost advantage of PVC manufacturing.
Solution Approach 2:
The insert tube serves as an intermediary that prevents direct contact between anesthetic agents and the PVC wall, thereby eliminating adsorption-induced signal delay and strength reduction while allowing the PVC outer tube to maintain cost efficiency.
3Ease of manufacture
If PVC material is used for the catheter tube, then manufacturing cost is reduced, but adsorption reduces signal strength
Solution Approach 1:
The catheter system is segmented into an outer PVC tube for cost-effective manufacturing and an inner insert tube for reliable measurement. This segmentation ensures that the measurement reliability is not compromised by adsorption effects while maintaining the cost advantage of PVC material.
Solution Approach 2:
The insert tube acts as an intermediary barrier that prevents adsorption of anesthetic agents on the PVC wall, thereby ensuring reliable and accurate concentration measurements while allowing the PVC outer tube to provide cost-effective manufacturing.
4Measurement precision
If an insert tube with reduced adsorption characteristics is added, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The insert tube is nested within the outer catheter tube, with the inner tube placed inside the lumen of the outer tube. This nested configuration allows the low-adsorption insert tube to be integrated into the existing catheter structure without requiring complete redesign, thereby improving measurement accuracy while minimizing the increase in device complexity.
Solution Approach 2:
The catheter is segmented into an outer tube and an inner insert tube, where each segment has a specific function. This segmentation allows the system to achieve improved measurement accuracy through the insert tube while maintaining a relatively simple overall structure that can be manufactured cost-effectively.
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 use of insert tubes or coatings with reduced adsorption characteristics prevents the adsorption of anesthetic agents on the catheter wall, ensuring precise and accurate concentration measurements of anesthetic agents in exhaled air, thereby improving the reliability of anesthesia monitoring.
Implementation Method 1
a catheter tube made from a PVC material may exhibit a substantial adhesion for anesthetic agents, in particular Propofol, causing molecules to be adsorbed on the PVC tube wall
Data Source
Figure 1
Figure 2~3
AI summary
An endo-tracheal catheter (1) for use in an anesthetic procedure comprises a catheter tube (10) to be inserted into the trachea (40) of a patient (4), the catheter tube (10) having a tubular wall (101) defining an inner lumen (102) for guiding a gaseous flow, and a connection piece (11) which defines a chamber (110) being in fluid connection with the catheter tube (10) and comprising a port (110) for connecting a detection device (2) to the endo-tracheal catheter (1) for detecting at least one substance in the gaseous flow flowing through the catheter tube (10). Herein, an insert tube (13) is received in the inner lumen (102) of the catheter tube (10) for guiding the gaseous flow through the catheter tube (10) and/or a coating (103) covers the tubular wall (101) at a side facing the inner lumen (102) for guiding the gaseous flow through the catheter tube (10). In this way, an endo-tracheal catheter is provided which allows for an accurate measurement of a substance concentration in a gaseous flow, in particular in the context of an anesthesia procedure.