Pericardial Puncture Device with Controlled Needle Retraction
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Solution Overview
Problem
Existing pericardial puncture devices lack precise control over needle placement, which can lead to accidental puncture of deeper heart tissues during procedures.
Innovation Solution
A pericardial puncture device featuring an introducer with a retractable needle mechanism, where the needle is advanced and retracted using a rotatable actuator with a lead screw and lead nut system, allowing for controlled puncture of the pericardium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed needle mechanism is used in pericardial puncture devices, then the device structure is simple, but the needle placement precision is poor leading to accidental puncture of deeper heart tissues
Solution Approach 1:
The needle is made dynamically movable relative to the introducer through a retraction mechanism, allowing the needle to be pulled back after puncturing the pericardium. This dynamic adjustment enables precise control over needle position, preventing accidental puncture of deeper heart tissues while maintaining a relatively simple overall device structure.
Solution Approach 2:
The device is segmented into distinct functional components: the introducer shaft, the movable needle, and the retraction mechanism. This segmentation allows independent optimization of each component - the introducer provides structural simplicity while the needle and retraction mechanism provide precise control over needle placement and position.
2Reliability
If the needle is left advanced after pericardial puncture, then the pericardial space is accessible, but the risk of puncturing deeper heart tissues increases
Solution Approach 1:
The retraction mechanism allows the needle to be dynamically pulled back to a safe position within the introducer after puncturing the pericardium. This dynamic retraction maintains patient safety by preventing accidental puncture of deeper tissues while preserving accessibility to the pericardial space for the procedure.
Solution Approach 2:
The needle is designed to be retracted to a predetermined safe position within the introducer after puncture. This preliminary retraction action prevents accidental puncture of deeper heart tissues before any potential complications can occur, while still allowing the procedure to continue safely.
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 enables precise and controlled puncture of the pericardium, minimizing the risk of puncturing deeper heart tissues and enhancing patient safety during medical procedures.
Implementation Method 1
The actuator includes a lead screw mounted to the handle. The lead screw can be received in the introduces proximal portion and the handle can extend proud of the introduces proximal portion. Rotation of the handle in the first direction can drive rotation of the lead screw in the first direction.
Data Source
AI summary
A pericardial puncture device includes an introducer, a needle, and an actuator. The introducer has a lumen and extends between an introducer proximal portion defining an introducer proximal end and an introducer distal portion defining an introducer distal end. The needle is received in the lumen and extends between a needle proximal portion and a needle distal portion having a sharp distal tip. The needle is movable from a retracted configuration to an advanced configuration. In the retracted configuration, the sharp distal tip is within the lumen and shy of the introducer distal end. In the advanced configuration, the sharp distal tip outside of the lumen and proud of the introducer distal end. The actuator includes a handle that is rotatable in a first direction with respect to the introducer to drive movement of the needle from the retracted configuration towards the advanced configuration.