Variable Drive Tissue Resecting Instrument
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Solution Overview
Problem
Current tissue resecting instruments in endoscopic procedures lack versatility in cutting speed and suction capabilities, limiting their effectiveness in varying tissue types and conditions.
Innovation Solution
A tissue resecting instrument with a drive assembly that translates and rotates an inner cutting shaft through an outer shaft, featuring interchangeable helical channels with different pitches, and a vacuum generator for suction, allowing for adjustable cutting speeds and efficient tissue removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-pitch helical channel is used in the drive assembly, then the structure is simple, but the cutting speed cannot be adjusted for different tissue types
Solution Approach 1:
The drive assembly incorporates interchangeable helical channels with different pitches, allowing the system to dynamically adapt its cutting speed characteristics. The inner cutting shaft can engage different helical channels based on tissue type requirements, transforming a static structure into a dynamically adaptable one without requiring complex active control mechanisms.
Solution Approach 2:
The invention changes the pitch parameter of the helical channel to adjust cutting speed. By providing multiple helical channels with different pitch values and allowing selection among them, the system achieves variable cutting speeds for different tissue types while maintaining a relatively simple overall structure.
2Productivity
If the inner cutting shaft translates and rotates continuously, then cutting efficiency is high, but tissue debris cannot be effectively removed
Solution Approach 1:
The cutting and debris removal functions are segmented into distinct operational phases. The inner cutting shaft performs cutting during its forward translation, then retracts during the return stroke while suction removes debris. This temporal segmentation allows both high cutting efficiency and effective debris removal without requiring simultaneous execution of conflicting functions.
Solution Approach 2:
The drive assembly implements periodic reciprocating motion of the inner cutting shaft, alternating between forward cutting strokes and backward retraction strokes. This periodic action is synchronized with the vacuum suction cycles, ensuring that debris removal occurs during the retraction phase while cutting occurs during the forward phase, resolving the contradiction between cutting efficiency and debris removal.
3Productivity
If the cutting shaft moves at high speed, then productivity is improved, but control precision and tissue accuracy decrease
Solution Approach 1:
The system provides dynamic control over cutting speed by allowing selection among helical channels with different pitches. For precision work on delicate tissues, operators can select channels with smaller pitches that provide slower, more controlled cutting. For robust tissue removal, channels with larger pitches enable faster cutting. This dynamic adaptability resolves the trade-off between speed and precision.
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
Enables precise and efficient cutting of tissues with adjustable speeds and effective suction, enhancing the instrument's versatility and effectiveness in endoscopic procedures.
Implementation Method 1
the vacuum generator is configured to generate vacuum to suction cut tissue through the inner cutting shaft and into the vacuum generator
Data Source
AI summary
A tissue resecting instrument includes an outer shaft defining a window at a distal end portion thereof, an inner cutting shaft extending through the outer shaft and configured to translate and rotate relative to the outer shaft to cut tissue extending through the window, and a drive assembly coupled to the inner cutting shaft. Actuation of the drive assembly in a first configuration drives translation of the inner cutting shaft at a first linear speed and rotation of the inner cutting shaft at a rotational speed. Actuation of the drive assembly in a second configuration drives translation of the inner cutting shaft at a second linear speed different from the first linear speed and rotation of the inner cutting shaft at the rotational speed.