Arthroscopic Probe with Reciprocating Electrode for Tissue Ablation
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Solution Overview
Problem
Current arthroscopic surgical tools lack a reposable design with disposable cutting components and reusable handles, which complicates sterilization and setup, and they often require multiple external connections, limiting their effectiveness in procedures like subacromial decompression and anterior cruciate ligament reconstruction.
Innovation Solution
The development of electrosurgical probes with a reciprocating electrode member and a ceramic distal housing, integrated with a motor drive system for high-speed axial movement, allowing for both cutting and ablation modes with minimal external connections, enabling efficient tissue removal and simplifying sterilization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If arthroscopic surgical tools use a non-reposable design with integrated cutting components, then device simplicity is improved, but sterilization complexity and setup time increase
Solution Approach 1:
The device is divided into two main segments: a reusable handle assembly and a disposable cutting component assembly. The cutting component can be detached and replaced without sterilizing the entire device, thus reducing sterilization time and complexity while maintaining device simplicity.
Solution Approach 2:
The cutting component is designed as a disposable element that can be discarded after use, eliminating the need for complex sterilization processes. This allows the main handle assembly to remain simple while the disposable component handles the sterilization burden.
2Adaptability or versatility
If arthroscopic tools require multiple external connections for operation, then functional versatility is improved, but ease of operation and sterilization simplicity deteriorate
Solution Approach 1:
Multiple functional components (motor drive, control electronics, power supply) are merged into the handle assembly, which remains outside the sterile field. This allows the sterile cutting component to have minimal connections, simplifying both operation and sterilization while maintaining full functionality through the integrated handle.
3Productivity
If high-speed reciprocating motion is used for tissue cutting, then cutting efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The cutting component uses high-speed reciprocating motion generated by a simple oscillating mechanism rather than complex multi-axis movement. This mechanical vibration approach achieves high cutting efficiency while keeping the device structure relatively simple and manufacturable.
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 solution provides a high-speed, efficient method for cutting and ablating tissues with reduced complexity in setup and sterilization, enhancing the effectiveness of arthroscopic procedures by integrating disposable cutting components with reusable handles.
Implementation Method 1
configured to reciprocate the elongated edge longitudinally relative to the window at high speed
Implementation Method 2
an RF generator operatively coupled to the electrode member when the hub is secured to the handpiece
Data Source
AI summary
An electrosurgical probe can be detachably secured to a handpiece having a motor drive unit and an RF current contact. The electrosurgical probe includes an elongate shaft having a longitudinal axis, a distal dielectric tip, and a proximal hub which is detachably securable to the handpiece. A hook electrode is reciprocatably mounted in the distal dielectric tip, and an RF connector on the hub is couplable to the RF current contact in the handpiece when the hub is secured to the handpiece. A drive mechanism in the hub mechanically couples to the hook electrode, and drive mechanism engages a rotational component in the motor drive unit when the hub is secured to the handpiece. The drive mechanism converts rotational motion from the rotational component into axial reciprocation and transmits the axial reciprocation to the hook electrode to axially displace the hook electrode between a non-extended position and an extended position relative to the dielectric tip.