Offset-Solenoid Surgical Shaver Reciprocation for Cleaner Tissue Cutting
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Solution Overview
Problem
Conventional surgical shavers using rotational motors with parallel gear trains cause tissue tearing and require air pressure-driven reciprocating blades that result in weak cutting strokes, limiting their ability to effectively cut through tissue.
Innovation Solution
A medical device with a solenoid offset from the central axis, a mechanical arrangement, and a lever member to drive the inner blade tube, providing a robust reciprocating motion without air pressure, enhancing cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If air pressure is used to drive reciprocating blades, then the device can achieve reciprocating motion, but the cutting stroke becomes weak and cannot effectively cut through tissue
Solution Approach 1:
The patent replaces the air pressure-driven mechanical system with a direct mechanical drive system. A motor coupled to a drive shaft with eccentricity directly drives the reciprocating blade through mechanical linkage, eliminating the intermediate air pressure conversion step. This direct mechanical coupling provides stronger and more reliable cutting force while maintaining reciprocating motion.
Solution Approach 2:
The patent introduces eccentricity in the drive shaft mechanism, transforming rotational motion into reciprocating linear motion through a dimensional transformation. The eccentric offset creates a mechanical advantage that converts continuous rotation into the desired back-and-forth cutting motion with sufficient force amplitude.
2Productivity
If rotational motors with parallel gear trains are used, then the device can provide continuous rotation, but the oscillating motion tears and strips mucosa
Solution Approach 1:
The patent implements periodic reciprocating motion of the blade instead of continuous rotation. The blade moves forward in one direction to cut tissue, then reverses direction to reset, creating a periodic cutting action. This periodic motion provides cleaner cuts by reducing lateral forces that cause tearing and stripping of mucosa.
3Force
If a solenoid offset from the central axis is used to drive the inner blade tube, then robust reciprocating motion is achieved, but the device complexity increases
Solution Approach 1:
The patent employs an offset solenoid configuration where the solenoid is positioned asymmetrically relative to the central axis of the blade tube. This asymmetric placement creates a mechanical lever arm that converts solenoid linear motion into robust reciprocating motion of the blade tube. The offset position provides mechanical advantage while maintaining a relatively simple overall device structure.
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 achieves cleaner and more precise tissue cuts with greater force and reliability compared to conventional air pressure-driven systems.
Implementation Method 1
The medical device includes a blade tube section, a solenoid, and a mechanical arrangement
Data Source
AI summary
Disclosed herein is a medical device. The medical device includes a blade tube section, a solenoid, and a mechanical arrangement. The blade tube section includes an outer blade tube, an inner blade tube, and a cutting window at a distal end of the blade tube section. The solenoid is offset from a central axis of the blade tube section. The mechanical arrangement is between the inner blade tube and the solenoid.