Endoscopic Vessel Dissection Tip with Curved Bottle Nose
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Solution Overview
Problem
Endoscopic vessel harvesting (EVH) procedures face challenges in minimizing direct vessel compression, longitudinal stretching, and controlling fluid pressure to prevent carbon dioxide embolization, which can lead to trauma and complications during blood vessel dissection and harvesting.
Innovation Solution
The development of a blood vessel dissection apparatus with an elongated 'bottle nose' shape and concave surfaces to reduce trauma, along with a system for controlled fluid flow and pressure management, and a harvesting apparatus featuring rotating inner and outer shafts for precise tissue engagement and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional dissection device is used, then the dissection can be performed, but direct vessel compression and longitudinal stretching occur causing trauma
Solution Approach 1:
The dissection tip is designed with a curved, bottle-nose shape that follows the natural contour of the blood vessel. This curvature allows the tip to dissect tissue effectively while distributing contact pressure along a broader surface area, preventing focal compression points that would cause vessel trauma.
Solution Approach 2:
The dissection device incorporates a depression in its shaft that creates a segmented structure with distinct zones: a contact surface for tissue dissection, a depression zone for reduced vessel contact, and a shaft portion for structural support. This segmentation allows the device to perform dissection functions while creating a protective zone that minimizes direct compression on the vessel.
2Area of stationary object
If carbon dioxide is flowed into the dissection cavity to maintain working space, then adequate working space is provided, but over-pressurization can lead to carbon dioxide embolization
Solution Approach 1:
The system incorporates pressure monitoring and control mechanisms that provide feedback on the pressure within the dissection cavity. This allows the operator to maintain adequate working space with carbon dioxide insufflation while receiving real-time information about pressure levels, enabling adjustment to prevent over-pressurization that could cause embolization.
Solution Approach 2:
The device allows for dynamic adjustment of carbon dioxide flow rate and pressure parameters. By controlling these parameters within safe ranges, the system maintains sufficient working space for dissection while preventing pressure levels that would exceed central venous pressure and cause gas embolization.
3Adaptability or versatility
If excessive rotation of the harvester shaft is required to approach target tissue, then complete rotational capability is achieved, but rotational disorientation occurs
Solution Approach 1:
The harvesting apparatus is divided into two independently rotatable components: an outer shaft and an inner shaft. The outer shaft provides complete 360-degree rotational capability for approaching target tissue from any direction, while the inner shaft can be rotated independently to position the cutting instrument. This segmentation allows the outer shaft to be kept in a stable, ergonomic position while the inner shaft handles the precise positioning, eliminating rotational disorientation.
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
The solution minimizes vessel trauma, reduces the risk of carbon dioxide embolization, and enhances the precision and ergonomics of the harvesting process by allowing for reduced device rotation and improved control over fluid pressure, thereby improving the safety and efficiency of EVH procedures.
Implementation Method 1
Trauma to side branches the main vessel trunk may be reduced by reducing friction, vessel compression and vessel stretching
Implementation Method 2
Control over the fluid flow and/or pressure during an endoscopic procedure may reduce the likelihood of over-pressurization within the subcutaneous tunnel compartment. That over-pressurization may, in some instances, lead to the development of carbon dioxide embolization
Implementation Method 3
The blood vessel harvesting apparatus described herein may include a stabilizing member that can be used to hold a blood vessel in a fixed position during cautery and/or severing of the vessel
Implementation Method 4
The blood vessel harvesting apparatus described herein may provide potential advantages because of the ability, in some embodiments, to rotate an inner harvester shaft relative to the position of a cutting device
Data Source
AI summary
Apparatus, systems, and methods for endoscopic dissection of blood vessels and control over cavity pressure within an endoscopic procedure are described herein. Apparatus, systems, and methods for harvesting of blood vessels are also described herein.