Disposable Spine Shaver with Perpendicular Cylindrical Blade
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Solution Overview
Problem
Current orthopedic tissue cutting devices, such as rongeurs and hand-held powered instruments, are inefficient in removing large volumes of tissue during spine fusion procedures, leading to prolonged surgical times, increased patient trauma, and potential infection risks due to inadequate sterilization of reusable tools.
Innovation Solution
A disposable shaver apparatus with a cylindrical cutting blade oriented perpendicularly to its drive mechanism, allowing for a larger cutting surface and efficient tissue removal, along with interchangeable blades for varying tissue types, designed for minimally invasive spine fusion procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional hand tools such as rongeurs, curettes, osteotomes and chisels are used for tissue removal, then the tools can be precisely controlled during surgery, but the tissue removal rate is slow and surgical time is prolonged
Solution Approach 1:
The patent replaces manual mechanical tools (rongeurs, curettes, osteotomes, chisels) with a powered shaver system that uses a rotating cutting blade driven by a motor. This mechanical substitution enables continuous high-speed tissue removal without the intermittent biting action of manual tools, dramatically increasing the tissue removal rate and reducing surgical time while maintaining precision through controlled blade rotation and feed mechanisms.
Solution Approach 2:
The shaver employs periodic reciprocating motion of the cutting blade, where the blade moves forward to cut tissue and then retracts to clear debris and reset. This periodic action allows continuous tissue removal while maintaining blade sharpness and preventing clogging, enabling high productivity without sacrificing control or requiring frequent tool changes.
2Reliability
If reusable hand tools are used for tissue removal, then the tools can be sterilized and reused, but there is risk of inadequate sterilization and potential infection
Solution Approach 1:
The patent employs disposable shaver blades and disposable shaver units that are sterilized in factory-controlled environments using validated sterilization processes. Each disposable unit is individually packaged in sterile condition and used once, eliminating the risks associated with repeated sterilization cycles of reusable tools. The disposable nature ensures absolute sterility while the low cost allows single-use implementation without economic penalty.
3Productivity
If traditional hand tools with small cutting surfaces are used, then the tools can access tight spinal spaces, but the cutting efficiency is low
Solution Approach 1:
The patent transitions from small linear cutting surfaces to a three-dimensional rotating blade with circumferential cutting edges. The blade's rotation creates a volumetric cutting zone that engages tissue from multiple angles simultaneously, effectively increasing the functional cutting surface area from a two-dimensional edge to a three-dimensional cutting volume, thereby dramatically improving cutting efficiency while maintaining access to confined spinal spaces.
Solution Approach 2:
The shaver blade features a curved or cylindrical geometry with cutting edges distributed around its circumference. This spherical/curved design allows the blade to engage tissue from multiple points simultaneously during rotation, effectively multiplying the cutting surface area compared to a linear hand tool. The curved geometry also enables the blade to conform to the contours of the intervertebral disc space, maintaining access efficiency while maximizing tissue removal capacity.
Data Source
AI summary
A spine shaver designed with increased tissue removing efficiency is described. The shaver comprises a cylindrical shaver blade, an elongated body, and a pulley and belt drive mechanism. The shaver blade further comprises a tissue cutting surface that extends along the longitudinal axis of the shaver. The shaver is further designed with the shaver blade positioned perpendicularly to the elongated body. The increased surface area of the shaver blade and perpendicular blade orientation provide an efficient means of removing spinal tissue and debulking the area between two vertebrae.