Multi-chamber bag for medical purposes and method for recognition of the state of a separable seam of a multi-chamber bag for medical purposes

A method for identifying the state of a separable seam of multi-chamber bags for medical purposes which are formed by films that are arranged against one another, are made of an at least partially transparent material and are interconnected in a liquid-tight manner using at least one non-separable seam, the bag volume being divided into at least two chambers by at least one separable seam, by means of which the films arranged against one another are interconnected in a liquid-tight manner, wherein

• the multi-chamber bag is provided with at least one visually perceptible structure that signals the state of the separable seam and is composed of structural elements that the films arranged against one another comprise in the region of the separable seam and are in a predetermined spatial arrangement relative to one another such that the structural elements in the region of the separable seam complement one another to form the structure signalling the state of the separable seam when the separable seam is closed, such that the films in the region of the separable seam lie against one another in a predetermined orientation, and do not complement one another to form the structure signalling the state of the separable seam when the separable seam is open, such that the films in the region of the separable seam do not lie against one another in a predetermined orientation, meaning that the predetermined spatial arrangement of the structural elements relative to one another in the region of the separable seam no longer exists, and
• monitoring the bag using a monitoring device, which comprises an optical read apparatus for detecting the structure signalling the state of the separable seam and comprises an evaluation unit, the evaluation unit being configured such that a signal signalling the state of the separable seam is generated when the structure signalling the state of the separable seam is detected on the bag.

A method for identifying the state of a separable seam of multi-chamber bags for medical purposes which are formed by films that are arranged against one another, are made of an at least partially transparent material and are welded to one another in a liquid-tight manner using at least one non-separable seam, the bag volume being divided into at least two chambers by at least one separable seam, by means of which the films arranged against one another are interconnected in a liquid-tight manner, wherein

• in the region of the separable seam, the multi-chamber bag is provided with at least one visually perceptible structure that signals the state of the separable seam and is formed by regions of films that lie against one another and are designed as polarisers, the structure signalling the state of the separable seam being apparent to the viewer when the separable seam is closed, such that the films in the region of the separable seam lie against one another in a predetermined orientation, and the structure signalling the state of the separable seam not being apparent to the viewer when the separable seam is open, such that the films in the region of the separable seam do not lie against one another in a predetermined orientation, meaning that the predetermined spatial arrangement of the polarisers relative to one another no longer exists, and
• monitoring the bag using a monitoring device, which comprises an optical read apparatus for detecting the structure signalling the state of the separable seam and comprises an evaluation unit, the evaluation unit being configured such that a signal signalling the state of the separable seam is generated when the structure signalling the state of the separable seam is detected on the bag.