An insert assembly with radiofrequency identifier, said assembly being adapted to be inserted in a medical device handpiece, said assembly comprising: - an insert adapted to interact with a part of the patient's body, in which the insert comprises an insert metal tang; - a ferromagnetic layer, arranged in contact with said insert metal tang of the insert, wherein said ferromagnetic layer comprises ferromagnetic material; - a dielectric layer, arranged in contact with said ferromagnetic layer; - an insert antenna, arranged in contact with said dielectric layer, and comprising an insert antenna metal element, which extends along a predefined substantially planar profile, said profile, as a whole, wraps, at least partially surrounding said metal tang, said insert antenna being configured to receive and transmit electromagnetic fields within a given frequency range, modulated or not modulated - an identification chip, operatively connected to said insert antenna, said identification chip being configured to transmit, when activated, information relating the insert assembly; wherein said ferromagnetic layer is adapted to reduce or cancel phenomena of attenuation and/or distortion of the electromagnetic field, caused by field parasitic effects in the vicinity of the insert antenna due to the interaction of a transmitted/received electromagnetic field with metal parts of the insert metal tang, and/or with liquids present in the insert, and/or with the metal insert antenna element, and wherein said ferromagnetic layer, dielectric layer and insert antenna form a transceiver device, adapted to put in wireless communication said identification chip with a handpiece antenna of said handpiece. - an insert adapted to interact with a part of the patient's body, in which the insert comprises an insert metal tang; - a ferromagnetic layer, arranged in contact with said insert metal tang of the insert, wherein said ferromagnetic layer comprises ferromagnetic material; - a dielectric layer, arranged in contact with said ferromagnetic layer; - an insert antenna, arranged in contact with said dielectric layer, and comprising an insert antenna metal element, which extends along a predefined substantially planar profile, said profile, as a whole, wraps, at least partially surrounding said metal tang, said insert antenna being configured to receive and transmit electromagnetic fields within a given frequency range, modulated or not modulated - an identification chip, operatively connected to said insert antenna, said identification chip being configured to transmit, when activated, information relating the insert assembly; wherein said ferromagnetic layer is adapted to reduce or cancel phenomena of attenuation and/or distortion of the electromagnetic field, caused by field parasitic effects in the vicinity of the insert antenna due to the interaction of a transmitted/received electromagnetic field with metal parts of the insert metal tang, and/or with liquids present in the insert, and/or with the metal insert antenna element, and wherein said ferromagnetic layer, dielectric layer and insert antenna form a transceiver device, adapted to put in wireless communication said identification chip with a handpiece antenna of said handpiece. wherein said ferromagnetic layer is adapted to reduce or cancel phenomena of attenuation and/or distortion of the electromagnetic field, caused by field parasitic effects in the vicinity of the insert antenna due to the interaction of a transmitted/received electromagnetic field with metal parts of the insert metal tang, and/or with liquids present in the insert, and/or with the metal insert antenna element, and wherein said ferromagnetic layer, dielectric layer and insert antenna form a transceiver device, adapted to put in wireless communication said identification chip with a handpiece antenna of said handpiece.