Invasive medical device

An invasive medical device (10) is disclosed comprising a device portion (15) for inserting into a patient, the device portion including a functional module (20); an electrically conductive path (40)extending through the invasive medical device and connecting to the functional module; and a deformable switch (30) within the device portion arranged to alter the electrical impedance of the conductive path as a function of a degree of deformation of the switch, the deformation being caused by a blood parameter of the patient's blood that varies during the cardiac cycle of the patient. 公开了一种侵入式医学设备(10)，包括：用于插入到患者体内的设备部分(15)，所述设备部分包括功能模块(20)；延伸穿过侵入式医学设备并连接到功能模块的导电路径(40)；以及设备部分内的可变形开关(30)，所述可变形开关被布置成根据开关的变形程度改变所述导电路径的电阻抗，所述变形是由在患者的心动周期期间变化的患者血液的血液参数导致的。