Pharmaceutical Bag Opening Assembly With Clamped Cutting Zone

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Solution Overview

Problem

Existing opening assemblies for pharmaceutical containers risk contamination during bag opening due to particle detachment and entry into the bag, particularly in environments with stringent cleanliness standards like ISO Class 5, compromising sterility and cleanliness.

Innovation Solution

An opening assembly with a clamping mechanism to seal the bag interior from the outside environment, using a cutting element to remove the end flap while maintaining the clamped sections sealed, and a transport system with overpressure to prevent particle ingress, ensuring sterility and cleanliness during handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the bag is opened by cutting the end flap, then the bag can be accessed and containers can be removed, but particles may detach during cutting and enter inside the bag causing contamination

Engineering Contradiction:

Improvebag openingVSAvoidparticle contamination

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent applies overpressure as a counteracting force to prevent particle ingress. By maintaining positive pressure inside the bag relative to the external environment, any particles attempting to enter during cutting are pushed back by the pressure differential, effectively counteracting the contamination risk

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The clamping mechanism acts as an intermediary element that seals the bag perimeter during cutting. This intermediate sealing barrier prevents direct contact between the cutting zone (where particles are generated) and the protected interior, mediating the interaction between the opening operation and contamination prevention

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the protective film is removed from the tub in the environment with ISO Class 5 or lower, then contamination risk is minimized, but particles deposited on the film and tub may diffuse into the environment during removal

Engineering Contradiction:

Improvesterility maintenanceVSAvoidparticle diffusion

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The clamping mechanism is engaged in advance to seal the bag perimeter before the protective film removal operation begins. This preliminary sealing action ensures that even if particles are generated during film removal, they cannot enter the bag interior, pre-establishing the protective barrier before the harmful action occurs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent employs pneumatic overpressure within the bag to prevent particle diffusion during protective film removal. The pressure differential created by the pneumatic system ensures that particles on the film or tub surface are pushed outward rather than diffusing into the controlled environment or entering the bag

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Object-affected harmful factors

If a clamping mechanism is used to seal the bag interior, then particle ingress is prevented, but the device complexity increases

Engineering Contradiction:

Improvecontamination preventionVSAvoidopening assembly structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The clamping mechanism utilizes flexible sealing elements that conform to the bag perimeter to create an effective seal. These flexible thin film seals achieve contamination prevention without requiring complex rigid structures, maintaining simplicity while ensuring particle ingress prevention through adaptive sealing

Inventive Principle:

Principle #30Flexible shells and thin films

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 assembly effectively isolates the bag's contents from external contamination, maintaining sterility and cleanliness throughout handling and transfer, even after opening, while being cost-effective and practical to implement.

Implementation Method 1

the first zone (9) in which the proximal section (10) of the transport device (5) is arranged has a higher contamination class and a higher ambient pressure than the second zone (11) in which the distal section (12) of the transport device (5) is arranged

Methodology Applied

Scientific EffectOverpressure: Pressure Increase

Data Source

PatentEP3490893B2Opening assembly for bags housing containers for pharmaceutical use

Publication Date: 2025.09.10 IMA IND MASCH AUTOMATICHE SPA

Figure 1
Figure 2

AI summary

Opening assembly for bags (B) housing containers (A) for pharmaceutical use, comprising at least one clamping mechanism (2) for clamping a portion (C) of said bag (B) spaced apart with respect to an end flap (D) of the bag, said clamping mechanism (2) arranged so as to clamp together sections of opposing sheets (E, F) of said bag (B), and at least one cutting element (2a) for the trimming and the separation of said end flap (D) with respect to said sections of said opposing sheets (E, F) of said bag (B) mutually clamped together by said clamping mechanism (2).