Medical apparatus and instruments, namely, a centrifuge tube, air-tight lid, sliding aspirator, pipette, and filtering device that allows filtration, centrifugation, and concentrating of aspirated and harvested whole blood into platelet-rich plasma; Medical apparatus and instruments, namely, a filtering system for the sizing and/or separation and/or sorting and/or concentrating of biologic agents or their components including blood, plasma, platelet-rich plasma; Medical aids for tympanic injection; Medical instruments for use in relation to hearing; Ear inserts for medical use; Medical hearing aids apparatus; Tube for infusion; Infusion pumps; Apparatus for use in treating hearing disorders; Medical tubing for administering drugs; Artificial tympanic membranes; Pumps for medical use in the extraction of liquids; Apparatus for taking blood samples; Apparatus for taking blood; Plasma separators; Insufflation needles