Patellar Resection Tool With Non-Parallel Handle And Jaw Planes
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Solution Overview
Problem
Conventional patellar resection tools are difficult to use in minimally invasive knee surgery techniques where the patella is everted by less than 90°, as the handles operate in a plane perpendicular to the jaws, making them cumbersome and obstructing visibility and access.
Innovation Solution
A patellar resection tool with handles that move in a plane not parallel to the jaws, allowing for ergonomic use and improved visibility, featuring link members and rotational joints for translational movement of gripping members, and a ratchet mechanism for precise control and locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional patellar resection tools with handles operating in a plane perpendicular to the jaws are used, then the tool structure is simple, but the tool becomes difficult to use and obstructs visibility when the patella is everted by less than 90°
Solution Approach 1:
The patent changes the spatial relationship between the handles and jaws from a perpendicular arrangement (both operating in the same plane) to a three-dimensional arrangement where the handles operate in a plane that is not parallel to the plane of the jaws. This dimensional change allows the handles to be positioned ergonomically without obstructing the surgical site when the patella is everted by less than 90°, while maintaining a relatively simple overall tool structure.
2Ease of operation
If the handles are positioned for ergonomic use during less than 90° eversion, then ease of operation improves, but the handles may obstruct access to the patella
Solution Approach 1:
By positioning the handles in a plane that is not parallel to the plane of the jaws, the patent creates a three-dimensional configuration where the handles can be located in a more ergonomic position without interfering with access to the patella during less than 90° eversion. The link members connect the handles to the jaws through rotational joints that allow the gripping members to move in the correct plane while the handles move in a different plane.
3Illumination intensity
If the handles move in the same plane as the jaws, then the tool structure is simple, but visibility of the incision is reduced
Solution Approach 1:
The patent improves visibility by arranging the handles in a plane that is not parallel to the plane of the jaws. This spatial separation allows the surgeon to see the incision and surgical site more clearly without the handles obstructing the view. The link members with rotational joints enable this three-dimensional arrangement while maintaining a relatively simple mechanical structure.
Data Source
AI summary
A patellar resection tool has first and second gripping members adapted for relative movement between a closed position in which the patella can be held between the gripping members and an open position in which the patella can be released. The tool also has first and second handle members connected to the first and second gripping members respectively, for moving the gripping members between the open and closed positions. The first and second handle members are constrained for relative movement in a first plane and the first and second gripping members are constrained for relative movement in a second plane which is not parallel to the first plane. This allows the tool to be used in a minimally invasive surgical technique in which a patella is everted by an angle less than 90° without obstructing access to the patella.