but it should be clear that an embodiment might employ any appropriate filler material appropriate for the intended environment in some embodiments of the present disclosure one or more of the shell 102 the filler 104 and the magnet 106 may be radiopaque or may be marked with a radiopaque material that may aid in imaging the medical device 100 with fluoroscopy further other imaging modalities such as ultrasound may be used to image the medical device 100 fig2 depicts a medical device cluster 200 of multiple medical devices 100 magnets 106 cause adjacent medical devices 100 to clump forming the medical device cluster 200 the shape of the medical device cluster 200 can be arranged by applying external force so that movement of the stomach walls can rearrange the cluster a surgeon can choose the number of medical devices 100 based on a desired volume of stomach capacity to be filled typically the overall process of rearrangement consumes considerable abdominal muscle energy which may slow down the food processing rate and amplify the effect of reducing food intake fig3 illustrates the medical device 100 in a deformed state having for example a substantially elliptical shape to achieve the deformed state may require separate actions to alter the state of the filler 104 and to alter the shape of shell 102 those processes may proceed serially or in parallel for example the deformation process may include solidification of the filler e g water.