A drug delivery system comprising a housing and a dispensing means. The discharge means is a first rotating member having a first force transmission surface, the first rotating member configured to rotate with respect to the housing according to the set dose and / or the discharge dose, A second rotating member having a second force transmission surface, the second rotating member configured to rotate relative to the housing in accordance with the set dose and / or the discharge dose. At least a portion of the first force transmission surface and the second force transmission surface are configured to engage each other during dose setting and / or dispensing, and the first rotating member comprising the force transmission surface is magnetic Formed with a polymeric material containing particles, the polymeric material is magnetized to form a magnet that generates a spatial magnetic field. As a result, a spatial magnetic field that varies according to the rotational motion of the first rotating member is generated. [Selection] Figure 4Aハウジングと、吐出手段とを備える薬剤送達システム。吐出手段は、第１の力伝達面を備える第１の回転部材であって、設定投与量及び／又は吐出投与量に応じてハウジングに対し回転するように構成された第１の回転部材と、第２の力伝達面を備える第２の回転部材であって、設定投与量及び／又は吐出投与量に応じてハウジングに対し回転するように構成された第２の回転部材とを備える。第１の力伝達面及び第２の力伝達面の少なくとも一部分が、投与量の設定及び／又は吐出中に互いに係合するように構成され、力伝達面を備える第１の回転部材は、磁性粒子を含有するポリマー材料で形成され、ポリマー材料は、空間磁場を生成する磁石を形成するように磁化されている。これによって、第１の回転部材の回転運動に応じて変動する空間磁場が生成される。【選択図】図４Ａ
