Paracentesis Device Segmented Cannula Valve Catheter Assemblies
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Solution Overview
Problem
Current paracentesis devices lack features that ensure a closed environment during procedures, such as thoracentesis, to prevent pneumothorax and lung puncture, and offer limited procedural flexibility and safety for practitioners.
Innovation Solution
A paracentesis device comprising a cannula assembly with a movable inner cannula, a valve assembly with a reinsertible valve, and a flexible catheter assembly, which maintains a closed system and provides procedural flexibility through removably attachable components and a locking mechanism for enhanced safety and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional paracentesis device is used, then the procedure can be performed, but the closed environment cannot be maintained and pneumothorax risk increases
Solution Approach 1:
The device is divided into separate components (cannula assembly, valve assembly, catheter assembly) that can be detached and reattached. This segmentation allows the practitioner to maintain a closed environment by keeping the valve assembly connected during the procedure, preventing air entry while enabling fluid removal.
Solution Approach 2:
The valve assembly acts as an intermediary component between the cannula and catheter assemblies. It provides a controlled interface that maintains the closed environment by allowing fluid passage while preventing air entry, thus mediating between the need for fluid removal and the need to prevent pneumothorax.
2Adaptability or versatility
If a fixed paracentesis device is used, then the structure is simple, but procedural flexibility is limited
Solution Approach 1:
The device is divided into separate assemblies (cannula, valve, catheter) that can be detached and reattached. This segmentation provides procedural flexibility by allowing the practitioner to adjust the configuration during the procedure while maintaining relative structural simplicity through standardized connection interfaces.
Solution Approach 2:
The device transitions from a fixed structure to a dynamic, reconfigurable system. The detachable connections allow the device to adapt its configuration during the procedure, providing procedural flexibility while maintaining simplicity through consistent connection mechanisms.
3Productivity
If the inner cannula is continuously exposed, then fluid aspiration is efficient, but lung puncture risk increases
Solution Approach 1:
The protective outer cannula is positioned in advance to cover the inner cannula before insertion. This preliminary protective action prevents lung puncture during insertion and positioning, while the inner cannula can be extended for efficient fluid aspiration once properly positioned.
Solution Approach 2:
The inner cannula's position is dynamically controlled through extension and retraction mechanisms. The cannula can be extended to expose the opening for efficient fluid aspiration when needed, and retracted into the protective outer cannula when not in use to prevent lung puncture, providing dynamic control over the risk-benefit balance.
Data Source
AI summary
The invention described herein relates to an improved device for paracentesis procedures, such as thoracentesis. The device comprises a cannula assembly, valve assembly, and catheter assembly, wherein the cannula assembly is removably attached to the valve assembly, and the valve assembly is removably attached to the catheter assembly. The device can comprise an externally viewable indicator revealing the relative positions of the cannula assembly components. The device can further comprise a locking mechanism which controls the movement between cannula assembly components and is activated and deactivated by the coupling of the cannula assembly to the valve assembly. The device improves the precision and safety of its handling, and offers the practitioner several aspiration alternatives while maintaining separation of the internal and external patient environments.