TPO Bone Plate With Offset Axis And Overlapping Holes

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Solution Overview

Problem

Current bone plates used in Triple Pelvic Osteotomy (TPO) surgeries lack flexibility in screw orientation and reliability in fixing bone fragments, often leading to loosening of bone screws and requiring additional surgical complexity and time.

Innovation Solution

A TPO bone plate with an offset longitudinal axis and sets of overlapping holes with multifaceted surfaces, allowing for secure positioning of bone screws at any interval along the plate, including extreme ends, and providing unidirectional or bi-directional compression for optimal anatomical alignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional bone plates with pre-defined locking positions are used, then manufacturing precision is improved, but surgical flexibility deteriorates

Engineering Contradiction:

Improvelocking position precisionVSAvoidsurgical flexibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The bone plate transitions from static pre-defined locking positions to dynamic adjustable locking positions. The slot configuration allows the locking screw to be positioned at any point along the slot length, enabling dynamic adjustment during surgery to achieve optimal bone fragment alignment and compression while maintaining manufacturing precision through the self-centering mechanism.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If bone screws are used to fix bone fragments, then ease of operation is improved, but reliability deteriorates due to screw loosening

Engineering Contradiction:

Improvescrew insertion easeVSAvoidfixation reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The bone plate performs preliminary compression of bone fragments before the locking screw is fully tightened. The slot configuration and plate design create initial compression forces that stabilize bone fragments, preventing screw loosening during healing. This preliminary action ensures reliable fixation from the outset while maintaining ease of screw insertion.

Inventive Principle:

Principle #10Preliminary action

3Strength

If rigid fixation methods are used, then strength is improved, but adaptability deteriorates due to limited screw orientations

Engineering Contradiction:

Improvefixation strengthVSAvoidscrew orientation flexibility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The invention adds a dimensional aspect to screw positioning by introducing slots that extend along the bone plate length. This allows the locking screw to be positioned at multiple locations and orientations along the slot, providing adaptability in screw orientation while maintaining strong fixation through the rigid bone plate structure and compression mechanism.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS7905883B2Locking triple pelvic osteotomy plate and method of use

Publication Date: 2011.03.15 VIANT AS&O HLDG LLC

AI summary

A TPO bone plate with an offset longitudinal axis has a bone-contacting bottom side and a top side. Sets of overlapping holes communicate through the plate from the top to the bottom side. The overlapping holes have multifaceted surfaces such as a threaded surface or a coaxial series of annular grooves. The sets of overlapping holes are adapted to receive a bone screw with a head and a bone-engaging thread.