Modular Corpectomy Endplate Connection for Fast Secure Assembly

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Solution Overview

Problem

Current vertebral body replacement systems face challenges with time-consuming and complex methods for securing endplates to expanding columns, which often require additional instrumentation and may not be easily disassembled.

Innovation Solution

A vertebral body replacement system with a quick-connecting removable endplate connection mechanism using modular endplate connections and a spline feature for secure attachment and disassembly, allowing for low-force assembly and disassembly without additional tools.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional methods (screws, collets, press-fits) are used to secure endplates to expanding columns, then the connection is secure, but the assembly process becomes time-consuming and complex

Engineering Contradiction:

Improveconnection securityVSAvoidassembly time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The connection mechanism is segmented into distinct functional components: an endplate with internal cavity, an expandable ring member, and a compression element. This segmentation allows each component to perform its specific function efficiently while enabling quick assembly without complex multi-step fastening procedures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The expandable ring member is pre-configured with expansion capabilities and the endplate is pre-designed with the internal cavity and compression element positioning. This preliminary configuration allows the components to self-assemble through simple insertion and expansion actions, eliminating time-consuming fastening steps while maintaining secure connection.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If traditional connection methods are used, then the endplates are secured, but additional instrumentation is required

Engineering Contradiction:

Improveconnection securityVSAvoidinstrumentation requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The connection mechanism is designed to be self-servicing during assembly. The compression element automatically engages with the expandable ring member when the endplate is inserted, and the ring member's expansion action self-secures the connection without requiring external fastening tools or additional instrumentation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Multiple functions are merged into single components: the endplate serves as both the structural plate and the housing for the connection mechanism; the expandable ring member provides both the anchoring function and the securing mechanism; the compression element combines the locking and securing functions. This merging eliminates the need for separate fasteners and tools.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If traditional connection methods are used, then the endplates are secured, but disassembly becomes difficult or impossible

Engineering Contradiction:

Improveconnection securityVSAvoiddisassembly capability

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The connection mechanism transitions from a static permanent connection to a dynamic reversible connection. The expandable ring member can be compressed back to its smaller diameter, allowing it to disengage from the endplate's internal cavity. This dynamic capability enables easy disassembly and reconfiguration while maintaining secure connection during use.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The connection state is controlled by changing the diameter parameter of the expandable ring member. When expanded, it provides secure anchoring; when compressed, it allows disengagement. This parameter-based control mechanism enables reversible connection without complex fastening or cutting procedures.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system enables efficient, low-force assembly and disassembly of endplates, reducing the risk of implant damage and injury, while maintaining high strength and flexibility for various orientations and configurations.

Implementation Method 1

an expandable ring member configured to be inserted in the internal cavity of the endplate and expand in a radial direction from an unexpanded configuration to an expanded configuration

Methodology Applied

Scientific EffectRadial expansion:

Implementation Method 2

a compression element configured to be inserted in the internal cavity of the endplate and compress the expandable ring member in the radial direction

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS12605253B2Expandable corpectomy modular endplate connection

Publication Date: 2026.04.21 ASTURA MEDICAL INC

AI summary

A vertebral body replacement system having a quick-connecting removable endplate connection mechanism.