Surgical Blade Cartridge Guide Bar for Precise Cutting Depth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Surgical blade cartridges face challenges in controlling the depth of cut during bone surgery, particularly when using sagittal or reciprocating blades, as surgeons must rely on feel and force regulation to avoid cutting through bone and into underlying soft tissue, leading to physical and mental stress.
Innovation Solution
The surgical blade cartridge incorporates a static guide bar with structural members that allow for better control over the blade's movement, including pivot arms and surfaces that act as stops, enabling precise positioning and limiting the blade's movement to prevent cutting beyond the desired depth, and can be used with both sagittal and reciprocating blade configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional sagittal saw blade is used, then the blade can cut bone tissue, but the surgeon must rely on feel and force regulation to control cutting depth, leading to physical and mental stress
Solution Approach 1:
The guide bar is pre-configured with structural members (pivot arms, stops, depth control features) that establish the cutting depth before the surgical procedure begins. The blade is pre-positioned relative to these features, eliminating the need for real-time force regulation by the surgeon during cutting.
Solution Approach 2:
The guide bar acts as an intermediary mechanism between the surgeon's hand and the blade. It translates the surgeon's simple forward pressure into controlled blade movement through pivot points and depth stops, mediating the complex force regulation that would otherwise be required directly at the blade.
2Reliability
If a conventional sagittal saw blade is used, then the blade can be actuated to cut tissue, but the oscillating movement of the blade wears against the surfaces of the cutting guide defining the slot
Solution Approach 1:
The guide bar is designed with a static configuration where depth control features are established before use. The blade is pre-positioned to engage these features, eliminating the need for the blade to wear against the cutting guide surfaces during operation.
Solution Approach 2:
Instead of having the blade oscillate against the cutting guide surfaces (conventional design), the invention inverts the relationship by making the guide bar static with pivot points, and the blade becomes the moving element that pivots at controlled points rather than sliding against guide surfaces.
3Manufacturing precision
If the guide bar is made static with structural members for depth control, then cutting depth precision is improved, but the device complexity increases
Solution Approach 1:
The guide bar is segmented into functional zones: proximal attachment region, mid-section with pivot arms, distal region with depth control features. Each segment performs a specific function, allowing complex depth control to be achieved through modular structural elements rather than a monolithic complex design.
Solution Approach 2:
The guide bar serves multiple functions simultaneously: it attaches to the saw handpiece, provides pivot points for blade oscillation, establishes cutting depth through structural members, and guides blade positioning. This multi-functionality consolidates what would otherwise require multiple separate components into a single integrated structure.
Data Source
AI summary
A surgical saw blade cartridge includes a bar, a blade and a drive link. The bar includes a first plate and an opposed second plate defining a space therebetween, and an opening in at least one of the plates for releasable connection to a saw. The blade includes a base moveably disposed in the space between the plates and a head integral with the base located outside of the bar. The head has teeth at least as wide as a portion of the bar adjacent the head. The drive link extends through the bar and is moveable therein with a proximal end configured for attachment to a drive component of the saw and a distal end connected to either the base of the blade or a pivot link. The bar includes a structural member adjacent the head that extends forward of the head.