Abstract: A device for growing cells has a container with a bottom; and a plurality of elements extending into an area for growing cells and formed as thin, elongated plates extending along the bottom one after the other at predetermined distances from one another.

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 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 laboratory pipet has a pipe member with a first end through which a liquid is taken into and discharged from the pipe member, and a second opposite end provided with an elastic flat diaphragm formed so that by depressing and releasing the diaphragm with the first end immersed into a liquid the liquid can be drawn into the pipe member, and by subsequent depressing the diaphragm the liquid can be discharged from the pipe member.