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 (P), said profile (P), 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 (P), said profile (P), 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 . <EOS>