Counter-Rotating Tissue Cutting Apparatus for Pliable Wall Penetration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods face difficulties in remotely cutting through pliable tissues without a structure to press against, making it challenging to create an opening in tissue walls for medical interventions like relieving bile duct blockages.
Innovation Solution
A counter-rotatable cutting apparatus with an inner and outer cylindrical cutting member, where the inner cutting member has an anchor tip to pierce the tissue and the outer member has cutting surfaces that, when counter-rotated, scissor the tissue to create an opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a probe is inserted to remotely cut tissue, then the ability to access and cut tissue within the body is improved, but the ability to effectively cut pliable tissue without a structure to press against deteriorates
Solution Approach 1:
The cutting apparatus is divided into two separate counter-rotating cutting members (inner and outer cutting members) that work together to cut the tissue. This segmentation allows each member to have a specific function (piercing and cutting) while working in coordination, solving the problem of cutting pliable tissue that lacks structural support.
Solution Approach 2:
The inner and outer cutting members are combined into a single integrated apparatus that operates together. The inner cutting member with its anchor tip merges with the outer cutting member to create a complete cutting system that can effectively pierce and cut pliable tissue by combining piercing and cutting functions in one device.
2Device complexity
If a single cutting member is used, then the device complexity is reduced, but the cutting effectiveness on pliable tissue deteriorates
Solution Approach 1:
The cutting function is segmented into two separate members: an inner cutting member with an anchor tip for piercing and an outer cutting member for cutting. This segmentation improves cutting effectiveness on pliable tissue by providing specialized functions for each member while maintaining manageable complexity through their coordinated operation.
Solution Approach 2:
The two cutting members are designed to counter-rotate relative to each other, creating a dynamic cutting action. This dynamic interaction between the inner and outer members enhances cutting effectiveness on pliable tissue by generating scissoring motion that efficiently severs the tissue without requiring excessive force or complex mechanisms.
3Device complexity
If the inner and outer cutting members are rotated in the same direction, then the control mechanism is simplified, but the cutting action is reduced
Solution Approach 1:
The cutting members are designed to counter-rotate rather than rotate in the same direction. This dynamic counter-rotation creates an effective scissoring action that significantly enhances cutting efficiency and productivity. The counter-rotating motion allows the cutting edges to pass against each other, creating a shearing effect that efficiently severs pliable tissue.
Solution Approach 2:
Instead of rotating both cutting members in the same direction (conventional approach), the invention inverts the approach by rotating them in opposite directions. This inversion creates a more effective cutting action where the cutting edges move against each other, generating superior cutting performance compared to co-rotation, while the control mechanism remains manageable through the drive shaft assembly.
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
Effectively cuts through tissues by using the anchor tip to pierce and the counter-rotation mechanism to scissor the tissue, facilitating the creation of openings in tissue walls for medical procedures with precision and control.
Implementation Method 1
an anchor tip at a distal end of the inner cutting member to pierce the tissue
Implementation Method 2
counter-rotating the inner cutting member and the outer cutting member
Implementation Method 3
A tissue is rotatably scissorable between the first cutting edge of the inner cutting member and the second cutting edge of the outer cutting member
Data Source
AI summary
Disclosed embodiments include apparatuses and systems for controlling an apparatus for cutting an opening in a tissue wall. In an illustrative embodiment, an apparatus for controlling a counter-rotatable cutting apparatus includes a first radial actuator configured to engage a first drive shaft. A second radial actuator is configured to engage a second drive shaft, the second drive shaft being coaxially disposed with the first drive shaft. A housing supports the first radial actuator and the second radial actuator and permits the first drive shaft and the second drive shaft to extend therethrough, the first drive shaft and the second drive shaft being relatively counter-rotatable responsive to rotation of at least one of the first radial actuator and the second radial actuator.