Microdebrider Tube Geometry for Reduced Clogging and Better Tissue Draw
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Solution Overview
Problem
Existing microdebriders experience clogging issues due to tissue build-up at choke points between the middle and outer tubes, requiring additional suction and surgeon intervention during sinus and ENT procedures.
Innovation Solution
A microdebrider design with a concentric inner and middle tube configuration, featuring a swaged portion to maintain a constant inner diameter and peak-to-peak tooth alignment to draw tissue proximally into the lumen, combined with a channel for fluid passage to enhance tissue cutting and removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional microdebrider blade geometry is used, then tissue cutting is achieved, but tissue is pushed distally during rotation requiring additional suction
Solution Approach 1:
The patent inverts the traditional blade geometry by positioning the cutting edge at the proximal end of the inner tube rather than the distal end. This reversal changes the direction of tissue force application during rotation, causing tissue to be drawn proximally into the lumen rather than pushed distally, thereby eliminating the need for additional suction to force tissue into the instrument.
2Device complexity
If traditional tube configuration is used, then device structure is simple, but tissue build-up occurs at choke points causing clogging
Solution Approach 1:
The patent applies local quality by creating a swaged portion at a specific location on the middle tube to increase the inside diameter at the critical junction area between the middle and outer tubes. This localized dimensional change eliminates the choke point that causes tissue build-up and clogging, while maintaining the overall simplicity of the concentric tube configuration elsewhere in the device.
3Ease of manufacture
If variable inner diameter lumen is used, then device manufacturing is easier, but choke points are created requiring surgeon intervention
Solution Approach 1:
The patent changes the dimensional parameter of the lumen by maintaining a constant inner diameter along the substantial length of the inner tube through the swaged portion on the middle tube. This parameter change eliminates variations in lumen diameter that create choke points, ensuring smooth tissue flow and reducing the need for surgeon intervention to clear blockages during procedures.
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
Reduces the risk of clogging and enhances tissue cutting efficiency by maintaining a constant inner diameter and directing tissue proximally into the suction path, improving surgical precision and reducing the need for manual intervention.
Implementation Method 1
a portion of the lumen is adapted to connect to a suction source
Implementation Method 2
a channel is defined between the concentric inner and middle tubes along a length thereof for passing a fluid therealong
Data Source
AI summary
A device for removing tissue includes a housing having an outer tube extending therefrom including an axis defined therealong. A middle tube is supported within the outer tube having an opening at a distal end with an edge. The middle tube includes a swage proximate the area of engagement between the middle and outer tubes. An inner tube is disposed within the middle tube and includes an opening having teeth at a distal end in registration with the opening in the middle tube, the inner tube rotates relative to the middle tube and the teeth, and the edge cooperate to cut tissue. A lumen is defined through the inner tube and extends from the opening to a suction source. The swage of the middle tube and the increased inner diameter associated therewith allows the inner tube to maintain a constant inner diameter along a length thereof, reducing choke points along the lumen.