Open-End Surgical Shaver for Cutting in Narrow Joint Gaps
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Solution Overview
Problem
Existing surgical shavers struggle to effectively reach and cut tissue in narrow joint gaps due to their design and placement of cutting edges, leading to prolonged operation times.
Innovation Solution
The surgical shaver features open distal ends with longitudinal and circumferential cutting edges on the inner and outer sleeves, allowing for enhanced tissue removal capabilities by cutting in both directions, enabling it to be introduced frontally into joint gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional surgical shaver design with closed distal ends and cutting edges only on outer sleeve is used, then the structure is simple and easy to manufacture, but the cutting efficiency is low and operation duration is prolonged
Solution Approach 1:
The cutting function is segmented between two distinct components: the outer sleeve with cutting edges and the inner sleeve with mating bars. This segmentation allows each component to have specialized functions - the outer sleeve provides primary cutting edges while the inner sleeve's mating bars create additional cutting action through relative motion, thereby improving cutting efficiency without requiring a completely redesign of the entire system
Solution Approach 2:
The invention transitions from single-direction cutting (longitudinal only) to multi-directional cutting by adding circumferential cutting capability. The mating bars on the inner sleeve engage with the outer sleeve to create circumferential cutting edges, enabling the shaver to cut tissue in both longitudinal and circumferential directions, significantly enhancing productivity
2Ease of operation
If conventional surgical shaver with fixed outer sleeve and oscillating inner sleeve is used, then the device can be introduced into joint gaps, but it cannot sufficiently reach tissue in narrow joint gaps due to design and cutting edge placement
Solution Approach 1:
The invention utilizes dynamic relative motion between the oscillating inner sleeve and the fixed outer sleeve to create effective cutting action. The mating bars on the inner sleeve engage with the outer sleeve during oscillation, dynamically creating circumferential cutting edges that enhance tissue removal capability in narrow joint gaps where accessibility is already limited
Solution Approach 2:
The inner sleeve is nested within the outer sleeve, with the inner sleeve's mating bars extending toward the outer sleeve's cutting edges. This nested configuration allows the cutting mechanism to be compact while maintaining effective cutting action, enabling introduction into narrow joint gaps while preserving cutting capability
3Productivity
If surgical shaver with only longitudinal cutting edges is used, then the structure is simple, but tissue removal time is prolonged
Solution Approach 1:
The invention merges longitudinal and circumferential cutting actions into a single integrated cutting mechanism. The outer sleeve provides longitudinal cutting edges while the inner sleeve's mating bars create circumferential cutting edges through their engagement, combining multiple cutting directions in one device to accelerate tissue removal without proportionally increasing device complexity
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
This design significantly improves cutting efficiency, allowing for faster tissue removal and reducing operation duration.
Implementation Method 1
The inner sleeve is driven by a rotary drive, in general in an oscillating manner, at high speeds of rotation (up to several 1000 revolutions per minute). By means of this (relative) rotational movement between the inner and the outer sleeve, a cutting effect is achieved
Data Source
AI summary
A surgical shaver has a tubular inner sleeve rotatable about its longitudinal axis and connectable to a rotary drive and a tubular outer sleeve surrounding and rotatably fixed with respect to the inner sleeve. The free distal ends of the inner and outer sleeves are open in the longitudinal direction. The outer sleeve has, near its free end, at least one cutting bar extending and projecting longitudinally and having at least one first cutting edge having a component in the longitudinal direction and starting from the foot region of the cutting bar and having at least one further cutting edge in the free end region having a component directed circumferentially inwards. The inner sleeve has, near its free end, at least one first mating bar extending and projecting longitudinally and extending substantially up to the free end of the at least one cutting bar.