TPLO Plate Compression via Sloped Hole and Rotation
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Solution Overview
Problem
In Tibial Plateau Leveling Osteotomy (TPLO) procedures, existing plates often fail to ensure proper seating and compression of the cut and repositioned tibial segments, leading to inadequate healing due to improper seating or insufficient compression.
Innovation Solution
A TPLO plate design featuring a proximal portion and a distal portion with strategically positioned holes, including a first distal hole for rotation and a second distal hole with a sloped compression surface, allowing for cranial and distal compression to secure the cut and repositioned tibial segments effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard TPLO plate is used without specialized compression features, then the plate structure remains simple, but the cut and repositioned tibial segments cannot be properly compressed and seated
Solution Approach 1:
The plate is divided into distinct functional zones: a proximal portion for positioning over the cut proximal tibia segment and a distal portion for positioning over the distal tibia segment. The distal portion includes specialized compression features (sloped compression surface and compression hole) separated from the proximal portion, allowing independent optimization of compression function without complicating the entire plate structure.
Solution Approach 2:
The distal portion of the plate incorporates specific local features including a sloped compression surface and a compression hole with specific geometry, while the proximal portion has different features (proximal holes for fixation). This local differentiation allows the plate to provide targeted compression where needed while maintaining simplicity in other areas.
2Reliability
If the plate uses fixed positioning holes only, then the structure is simple, but the plate cannot rotate to provide compression across the osteotomy cut
Solution Approach 1:
The distal hole is designed with a spherical recess that allows the plate to rotate about a bone fixation element inserted through the hole. This dynamic capability enables the distal end of the plate to move caudally and rotate, thereby providing compression across the osteotomy cut while maintaining a relatively simple hole configuration.
Solution Approach 2:
The spherical recess in the distal hole is pre-configured to receive the head of a bone fixation element, enabling rotation and compression to occur automatically during the standard insertion process. This preliminary design allows the compression function to be achieved without requiring additional complex mechanisms or steps.
3Reliability
If the plate lacks a sloped compression surface, then the manufacturing is simpler, but the distal end cannot move caudally to achieve proper compression
Solution Approach 1:
The distal hole includes a sloped compression surface with a specific angle (e.g., 45 degrees) relative to the longitudinal axis. This parameter change creates the mechanical advantage needed to convert linear insertion force into rotational movement of the distal end, achieving compression without requiring complex manufacturing processes.
Solution Approach 2:
The sloped compression surface replaces the need for complex mechanical compression mechanisms with a simple geometric feature. The slope angle is designed to automatically generate the necessary compression force during screw insertion, eliminating the need for separate compression devices or complex mechanical systems.
Data Source
AI summary
TPLO plate includes a body having a proximal portion positioned over a cut and repositioned proximal segment of a tibia during a procedure and a distal portion positioned over a distal segment of the tibia during the procedure and a first distal hole extending through a proximal end of the distal portion from the first surface to the second surface. The first hole is configured so that the body is rotatable about a fixation element seated therein in combination with a second distal hole extending through the distal portion distally of the first hole. The second hole includes a compression surface along a caudal side thereof, so that a head portion of a fixation element is slid therealong during insertion into the second hole and the distal end is moved caudally relative to the fixation element and the body is rotated about the fixation element in the first hole relative to the recess of the first hole, cranially compressing the proximal segment against the distal segment.