Abstract: A medical needle unit has a needle having a tip insertable in as well as withdrawable from the body of a patient and a protective element for preventing accidental puncture by the tip of the needle after the withdrawal the tip of the needle from.

Abstract: A medical needle unit has a front end with a tip and a rear end and insertable with a tip in as well as withdrawal from the body of a patient, a protective element for preventing accidental puncture by the tip of the needle after the withdrawal of the needle from the body, the protective element including a hood movable between an exposing position in which the tip of the needle is exposed and an enclosed position in which the tip of the needle is enclosed, a spring connecting with the hood so that when the spring is compressed the hood is in the exposed position and when the spring is relaxed the hood is in the enclosed position, and a retaining element which retain the spring in the compressed position and therefore the hood in the exposing position before an injection by the needle and is releasable during the injection so as to relax the spring and to move the hood to the enclosing position.

Abstract: A device for growing cells has a container which forms an inner chamber, and a plurality of discs located in the inner chamber and provided with corrugations sufficient to entrain a growth medium with cells during a rotation of the container with the discs, while allowing the growth medium with the cells to slowly flow downwardly.

Abstract: A device for disaggregating tissues comprises a pestle having a working end provided with a net, and at least one additional net communicating with a source of vacuum, so that a tissue placed on the additional net can be desegregated by rubbing the net of the pastle against the additional net under vacuum pulling separated tissues through the additional net.

Abstract: A container for biological culture (1, 1') has a wall which limits an inner chamber with an area (2) for growing cells. The wall has a brush-like wall portion (4, 8) with a plurality of bristle-shaped projections (5, 5') extending into the area (2) for growing cells. The container (1, 1') has a significantly increased area for growing cells.