Vacuum-Actuated Piston Valving for Serial Drug Modules

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Solution Overview

Problem

Existing pharmacy compounding systems for intravenous drug administration face challenges such as high risk of needle-stick injuries, medication errors, drug waste, and environmental hazards due to complex and costly machines, especially when preparing synergistic drug combinations.

Innovation Solution

A moveable piston seal with a bypass chamber in the module's outlet fluidics that seals during vial piercing and opens with vacuum application, allowing fluid path creation between serially connected drug modules.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If complex electromechanical pharmacy compounding machines are used to automate drug preparation, then productivity and precision are improved, but device complexity and cost increase significantly

Engineering Contradiction:

Improvedrug preparation efficiencyVSAvoidmachine complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system divides the drug delivery function into separate serially-connected modules, each handling a specific drug or function. This segmentation allows each module to be simple in design while the overall system achieves automated compounding capability through the series connection of multiple simple modules.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs disposable drug modules that are pre-filled and sealed. Each module is a simple, low-cost, single-use component that eliminates the need for complex reusable machinery. The modules are discarded after use, avoiding the complexity of cleaning, sterilization, and maintenance of expensive equipment.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Device complexity

If traditional manual compounding procedures are used, then device complexity is reduced, but the risk of needle-stick injuries and medication errors increases

Engineering Contradiction:

Improvecompounding system simplicityVSAvoidsafety against needle-stick injuries and medication errors

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system enables self-service drug preparation where the modules automatically connect and transfer drugs through integrated fluid pathways and valving mechanisms. The piston-driven design automatically controls fluid flow and mixing without requiring manual intervention, eliminating needle-stick risks and medication errors while keeping the system relatively simple.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent introduces an intermediary automated compounding device that acts as a mediator between the simple disposable modules and the patient. This intermediary handles all potentially hazardous operations (piercing, connecting, fluid transfer) automatically, protecting healthcare workers from exposure while maintaining system simplicity through the use of basic mechanical components.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Loss of substance

If serially connected drug modules are used to reduce waste, then loss of substance is minimized, but the sealing mechanism complexity increases

Engineering Contradiction:

Improvedrug wasteVSAvoidsealing mechanism complexity

Core Design Contradiction:

Loss of substanceVSDevice complexity

Solution Approach 1:

The patent extracts the sealing function into a dedicated piston component within each module. This separate, focused sealing mechanism uses a simple bypass chamber design that isolates the sealing requirement from the overall module complexity. The piston is a discrete element that can be manufactured independently and assembled into the module.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The sealing mechanism utilizes parameter changes in the piston position (sealed vs. bypass positions) to control fluid flow. By changing the physical state or position of the piston rather than using complex mechanical linkages, the system achieves effective sealing with minimal complexity. The bypass chamber design allows the piston to transition between states using simple pressure differential.

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

Reduces needle-stick risks, minimizes drug waste, and enables compounding by non-specialists at remote locations, ensuring reliable and cost-effective preparation of drug combinations.

Implementation Method 1

opens with vacuum application

Methodology Applied

Scientific EffectVacuum: Vacuum

Data Source

PatentUS20250318993A1Piston valving for serially connectable drug modules of a combinatorial drug delivery device

Publication Date: 2025.10.16 BRISTOL MYERS SQUIBB CO

AI summary

A valving arrangement is provided herein for regulating fluidics of modules useable in a combinatorial drug delivery device. The valving includes a slidable piston valve, adjustable to selectively seal an outlet path from a drug vial and a sealing port, in parallel to a vent, for selectively sealing an inlet path to the drug vial. Advantageously, the subject invention allows for applied negative pressure to adjust the valving to allow flow between serially-connected modules forming a drug delivery device.