Helical Cutting Assembly for Precise Tissue Excision
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Solution Overview
Problem
Conventional minimally invasive surgical resection methods for excising abnormal tissues, such as cancer, face challenges including difficulty in precise visualization and control of cutting instruments, leading to excessive tissue removal and irregular margins, which complicates further treatment and assessment.
Innovation Solution
A minimally invasive excisional device with a cutting assembly that can be precisely placed and stabilized using imaging guidance, allowing for the removal of whole, intact tissue samples with uniform margins, and includes features like a tubular introducer assembly and helical cutting elements for accurate excision and collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional minimally invasive surgical resection methods are used, then tissue removal is achieved, but precise visualization and control of cutting instruments is difficult, leading to excessive tissue removal and irregular margins
Solution Approach 1:
The cutting instrument is segmented into a separate可控 cutting element that can be precisely positioned and controlled independently from the introducer assembly, allowing for better visualization and control during the excision process
Solution Approach 2:
An intermediary cutting element is introduced between the introducer assembly and the target tissue, allowing for precise control and visualization of the cutting process while maintaining the minimally invasive approach
2Manufacturing precision
If conventional surgical methods are used, then abnormal tissue is removed, but excessive normal tissue is also removed and margins are irregular, complicating further treatment and assessment
Solution Approach 1:
The cutting element is designed to apply cutting action locally and precisely at the desired margin, allowing for uniform excision of abnormal tissue while preserving surrounding normal tissue with consistent margins
Solution Approach 2:
The conventional mechanical cutting approach is replaced with a more controlled cutting mechanism that enables precise margin control and reduces variability in tissue removal
3Length of moving object
If minimally invasive approaches are used, then smaller incisions are made, but difficulty in visualizing and controlling cutting instruments increases
Solution Approach 1:
The cutting element serves as an intermediary that can be visualized and controlled separately from the introducer, enabling minimally invasive access while maintaining visibility and control during the cutting process
Data Source
AI summary
An excisional device may comprise an introducer comprising a distal trough portion and a cutting assembly. The cutting assembly may comprise an axial hand element configured to selectively bow out of and away from the distal trough portion and to retract into the distal trough portion and a helical cutting element wound around the axial band element. A rotating drum may be provided to cause the cutting assembly to selectively rotate, bow and retract according to a mechanically-driven first cutting profile that is defined by a shape of a channel formed in the drum. An optical guidance projector assembly may be coupled to the excisional device and may be configured to visually indicate when a distal portion of the excisional device is aligned with an imaging plane of an imaging probe and in a desired position.