Multi-Mode Dissecting Cannula for Controlled Tissue Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional surgical devices for tissue dissection in minimally invasive procedures lack control over tissue dissection, often require additional tools, and fail to effectively manage debris, leading to compromised visualization and increased procedural risk.
Innovation Solution
A multi-mode tissue dissecting device with a cannula, dilation wedge, and expandable dilation member, featuring a dissecting surface with a higher friction coefficient and fluid ports for suction or irrigation, allowing for controlled dissection and debris management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If balloon-type structures are used for tissue dissection via expansion, then tissue dissection is achieved, but control over the amount of tissue dissection is reduced
Solution Approach 1:
The device divides the dissection function into multiple modes: a deflatable balloon for initial tissue separation, a retractable wedge for controlled mechanical dissection, and a textured surface for gentle tissue loosening. This segmentation allows the physician to select the appropriate dissection mode for each specific tissue type and procedural need, thereby maintaining control and predictability.
Solution Approach 2:
The device incorporates dynamically adjustable components including a deflatable balloon with variable volume, a retractable wedge that can extend and retract, and an expandable textured surface. These dynamic features enable the physician to adjust the dissection mechanism in real-time based on tissue response, ensuring controlled and predictable dissection outcomes.
2Ease of operation
If obturator-type structures are used for tissue dissection via dilation, then tissue dissection is achieved, but the ability to tease or loosen adjoining tissue is lost
Solution Approach 1:
The device segments the dissection function across multiple components: the obturator for dilation, the wedge for mechanical separation, and the textured balloon surface for teasing and loosening tissue. This segmentation enables the physician to perform gentle tissue manipulation while maintaining a relatively simple overall device structure.
Solution Approach 2:
Different portions of the device have specialized local properties: the obturator provides smooth dilation, the wedge provides focused mechanical separation, and the textured balloon surface provides gentle tissue loosening. This local quality differentiation enables versatile tissue manipulation without requiring a complex multi-device system.
3Ease of operation
If separate dissection devices are used in addition to scopes, then tissue dissection is achieved, but the number of devices that must be manipulated increases
Solution Approach 1:
The device merges multiple functions into a single integrated system: visualization (scope), dilation (obturator), mechanical dissection (wedge), and gentle tissue loosening (textured balloon). This consolidation allows the physician to perform all dissection tasks through one device, reducing the number of devices to manipulate while maintaining full dissection capability.
Solution Approach 2:
The device is designed as a universal access device that can perform multiple functions: visualization, dilation, dissection, and tissue manipulation. This multi-functionality eliminates the need for separate specialized devices while providing comprehensive dissection capability across different tissue types and procedural needs.
4Reliability
If conventional dissection devices are used, then tissue dissection is achieved, but debris management and visualization are compromised
Solution Approach 1:
The device merges debris management functionality directly into the dissection device through integrated suction ports and irrigation channels. This allows simultaneous tissue dissection and debris removal, maintaining clear visualization without requiring separate debris management devices.
Solution Approach 2:
The device functions as a universal tool that combines dissection, debris removal, and irrigation capabilities. This multi-functionality ensures reliable visualization quality while managing debris effectively, without significantly increasing device complexity beyond the integrated system.
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 gentle, gradual, and forceful tissue dissection, maintaining clear visualization by effectively managing debris and reducing the need for additional tools, thereby improving surgical precision and safety.
Implementation Method 1
a dissecting surface having a frictional coefficient greater than that of a frictional coefficient of the cannula such that the dissecting surface grips the tissue
Implementation Method 2
an expandable dilation member located about an exterior surface of the cannula to separate tissue when expanded
Implementation Method 3
a dilation wedge, smaller than an outer diameter of the cannula and located at a distal end of the cannula and configured to permit mechanical dilation of a small opening in tissue into a larger opening
Data Source
AI summary
Methods and devices described herein facilitate improved access of locations within the body by providing a variety of dissection modes on a single access device.