Nested Catheter for Single-Entry Brain Fluid Exchange
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Solution Overview
Problem
Current brain disease treatment methods, such as cerebral infarction treatment, often require multiple puncture sites for injecting high oxygen solutions and discharging cerebrospinal fluid, which is invasive and inefficient, and lack the ability to independently adjust injection and discharge positions within the body.
Innovation Solution
A brain disease treatment device with a first tube inserted into the subarachnoid space for discharging cerebrospinal fluid and a second tube for injecting a high oxygen solution, where the second tube can move within the first tube to adjust its position, allowing both procedures to be performed at a single puncture site with independent control over injection and discharge positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate puncture sites are used for injecting high oxygen solution and discharging cerebrospinal fluid, then the treatment can be performed, but the invasion to patients increases and the procedure becomes more complex
Solution Approach 1:
The patent combines the injection and discharge functions into a single catheter system with one puncture site. The catheter includes an injection lumen for delivering high oxygen solution and a discharge lumen for removing cerebrospinal fluid, both accessed through the same entry point in the subarachnoid space, thereby reducing procedural complexity and patient invasion while maintaining treatment effectiveness
2Device complexity
If a single catheter is inserted to perform both injection and discharge, then the number of puncture sites is reduced, but the ability to independently adjust injection and discharge positions is lost
Solution Approach 1:
The catheter is segmented into functionally independent lumens: an injection lumen with its own distal tip for high oxygen solution delivery and a discharge lumen with its own distal tip for cerebrospinal fluid removal. This segmentation allows each lumen to be independently positioned and controlled along the catheter shaft, enabling separate adjustment of injection and discharge positions while maintaining a single puncture site
Solution Approach 2:
The catheter system incorporates dynamic positioning capability where the distal tips of the injection and discharge lumens can be independently adjusted along the catheter shaft. This dynamic adjustment allows the injection position and discharge position to be optimized separately based on patient anatomy and treatment requirements, providing adaptability while maintaining procedural simplicity
3Device complexity
If the second tube is fixed within the first tube, then the device structure is simplified, but the ability to independently adjust injection and discharge positions is limited
Solution Approach 1:
The second tube (discharge tube) is designed to be movable relative to the first tube (catheter) within the injection lumen. This movable configuration allows the discharge tube to be adjusted independently along the catheter shaft to different positions, enabling independent control of the discharge position while maintaining a relatively simple overall tube structure. The movable design provides the necessary adaptability without requiring complex mechanical assemblies
Data Source
AI summary
A brain disease treatment device includes a first tube and a second tube which has an outer diameter smaller than an inner diameter of the first tube, can be arranged in an inner cavity of the first tube, and can move in the inner cavity of the first tube. The first tube is inserted into a subarachnoid space of a patient and discharges cerebrospinal fluid present in the subarachnoid space out of a body of the patient through a space between the inner cavity of the first tube and the outer side of the second tube. The second tube is inserted into the subarachnoid space and injects fluid through an inner cavity of the second tube into the cerebrospinal fluid present in the subarachnoid space. An end portion of the second tube is exposable from an end portion of the first tube in a longitudinal direction of the first tube.