Surgical Fluid Cassette Locking With Position Sensing

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Solution Overview

Problem

Existing surgical fluid management systems lack efficient and reliable mechanisms for securely locking and unlocking cassettes within consoles, leading to potential damage and operational inefficiencies.

Innovation Solution

A surgical fluid management system featuring a console with a cassette bay, sensors, and actuators that lock and unlock cassettes based on positional detection, utilizing optical or electromagnetic radiation reflection to ensure proper alignment and secure insertion, and data tags for identification and control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a locking mechanism is added to secure the cassette in the console, then the reliability of fluid management is improved, but the device complexity increases

Engineering Contradiction:

Improvecassette securityVSAvoidlocking mechanism

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces traditional mechanical locking mechanisms with a magnetic field-based locking system. The console contains a magnet that magnetically engages with a ferromagnetic material in the cassette, providing secure locking without complex mechanical components. This substitution maintains reliability while reducing device complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a sensor as an intermediary between the cassette and the locking mechanism. The sensor detects the presence and position of the cassette, and based on this detection, triggers the locking mechanism automatically. This intermediary enables intelligent, condition-based locking that improves reliability while keeping the actual locking structure simple.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If manual cassette insertion and removal is allowed, then the ease of operation is improved, but the risk of misalignment and damage increases

Engineering Contradiction:

Improvecassette insertionVSAvoidmisalignment damage

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent employs sensors that provide real-time feedback on cassette position and alignment during insertion. The sensor detects when the cassette is properly positioned and triggers the locking mechanism accordingly. This feedback loop ensures that users can easily insert and remove cassettes while the system automatically prevents misalignment damage by only locking when proper positioning is detected.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent implements preliminary alignment features such as guide rails and positioning structures that automatically align the cassette with the console before the locking mechanism engages. This preliminary action ensures correct positioning is achieved during manual insertion, preventing misalignment damage while maintaining ease of operation.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If automated locking and unlocking mechanisms are implemented, then the productivity of surgical procedures is improved, but the device complexity increases

Engineering Contradiction:

Improvecassette change efficiencyVSAvoidautomated control system

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements a self-service automated locking system where the console's sensor automatically detects cassette insertion and triggers the locking mechanism without requiring user intervention. The system serves itself by monitoring its own state and automatically responding, which improves productivity during surgical procedures while keeping the control system relatively simple compared to fully automated industrial systems.

Inventive Principle:

Principle #25Self-service

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

Enables secure, efficient, and reliable operation of fluid management systems by preventing cassette misalignment and damage, facilitating seamless integration and withdrawal, and ensuring authentic and tracked usage of cassettes.

Implementation Method 1

the optical sensor includes an emitter and a detector disposed adjacent one another. In the operational position of the cassette, the reflector is positioned to reflect electromagnetic radiation from the emitter to the detector.

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

the actuator is driven by a solenoid within the console

Methodology Applied

Scientific EffectElectromagnetic force: Solenoid

Data Source

PatentUS12491307B2Systems and methods facilitating surgical fluid management

Publication Date: 2025.12.09 MEDTRONIC XOMED LLC

AI summary

A surgical fluid management system includes a console defining a cassette bay and a cassette, including a fluid line extending therethrough, configured for insertion into the cassette bay of the console. The console includes a sensor disposed adjacent the cassette bay configured to detect a position of the cassette relative to the cassette bay to enable selective locking or unlocking of the cassette within the cassette bay. Additionally or alternatively, the console includes cassette bay electronics configured to obtain encoded information from the cassette.