Pressure-Responsive Infusion Catheter Outlets
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Solution Overview
Problem
Current infusion systems for pain therapy lack effective control over the distribution and release of pain relievers along the catheter, limiting the precision and efficiency of pain management.
Innovation Solution
The infusion system incorporates a catheter with multiple outlets, where at least one outlet is always open for continuous pain reliever delivery, and a second outlet that can be pressure-dependently controlled to open or close, allowing for fluid pressure-dependent regulation of painkiller release, utilizing elastic deformations of the catheter wall or a valve to manage the opening and closing of the second outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all outlets are always open for continuous analgesic delivery, then the reliability of pain relief is improved, but the ability to control local distribution of analgesic deteriorates
Solution Approach 1:
The catheter outlets are segmented into two functional groups: first outlets that remain constantly open for baseline analgesic delivery, and second outlets that can be selectively opened or closed based on fluid pressure. This segmentation allows simultaneous maintenance of reliable continuous delivery and controllable localized distribution.
Solution Approach 2:
The second outlets are designed with dynamic opening/closing capability responsive to fluid pressure changes. When fluid pressure exceeds a threshold, the second outlets open to increase local analgesic distribution; when pressure is low, they remain closed. This dynamic behavior enables adaptability in analgesic distribution while the first outlets maintain reliability through continuous operation.
2Measurement precision
If a valve mechanism is added for pressure-dependent control of outlets, then the control precision of analgesic delivery is improved, but the device complexity deteriorates
Solution Approach 1:
The second outlets utilize the fluid pressure from the analgesic delivery system itself to control their opening and closing states. The system self-regulates without requiring external control mechanisms, valves, or additional actuators. This self-service approach achieves precise pressure-dependent control while avoiding the complexity that would result from adding separate valve mechanisms.
Solution Approach 2:
The outlet state (open/closed) is directly controlled by changes in the fluid pressure parameter. When the fluid pressure in the lumen exceeds a predetermined threshold, the second outlets automatically open; when pressure is below the threshold, they remain closed. This direct parameter-based control achieves precision without mechanical complexity.
3Ease of operation
If the catheter wall is made elastically flexible for pressure-dependent outlet control, then the ease of operation is improved, but the strength of the catheter deteriorates
Solution Approach 1:
The catheter wall is designed with local quality differentiation: regions containing second outlets are made elastically flexible to enable pressure-dependent opening and closing, while other regions of the catheter wall maintain standard strength and rigidity. This localized flexibility allows easy pressure-responsive operation at specific outlets without compromising the overall structural strength of the catheter.
Solution Approach 2:
The catheter wall is segmented into flexible regions (at second outlet locations) and standard-strength regions. The flexible segments enable the second outlets to respond to fluid pressure changes, while the standard segments maintain catheter integrity and strength. This segmentation resolves the contradiction between ease of operation and overall strength.
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
This solution enables precise control over the distribution and release of pain relievers along the catheter, allowing for tailored pain management by adjusting fluid pressure, enhancing the effectiveness of pain therapy.
Implementation Method 1
the catheter wall is elastically flexible at least in the region of the slit, wherein the slit is closed at a first fluid pressure, and wherein the slit is open at a higher second fluid pressure as a result of an elastic deformation of the catheter wall caused by the second fluid pressure
Data Source
Figure 1
Figure 2~6
AI summary
An infusion system (1) for use in pain therapy, comprising a catheter (100) with at least one lumen (103) and multiple outlets (A), wherein the multiple outlets (A) each extend radially through a catheter wall (106) of the catheter (100) and are spaced proximodistal to one another, wherein the multiple outlets (A) comprise at least one first outlet (104) and at least one second outlet (105), wherein the first outlet (104) is open for the delivery of an analgesic (S) independently of any fluid pressure (P) prevailing in the lumen (103), and wherein the second outlet (105) is configured for the fluid pressure-dependent delivery of the analgesic (S) and is switchable between an open state in which the second outlet (105) is open for the delivery of the analgesic (S) and a closed state depending on the fluid pressure (P) prevailing within the lumen (103). Closed state in which the second outlet (105) is closed.