PROBLEM TO BE SOLVED: To provide a means for effectively detecting an abnormality of an implant bag after treatment. SOLUTION: A patch for an implant bag has a first barrier forming an inward facing first surface of the implant bag when placed in an implant bag filled with a gelled filler, and the first barrier in contact with the first barrier. A second barrier forming a second surface, which is the opposite surface of the first surface, and a sensor module arranged between the first surface of the first barrier or the first barrier and the second barrier. Be prepared. The sensor module receives power wirelessly from the outside, including at least one or more pressure sensors for detecting the pressure applied to the implant bag, a controller for transmitting the pressure signal sensed by the pressure sensor to the outside, and the outside. A wireless power receiving unit for supplying power to the controller, and the like. [Selection diagram] Fig. 2
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