Tiziano Agostinelli,Kevin John Lorimer,Quentin John Harmer
申请号：
GB201801224
公开号：
GB2582123A
申请日:
2018.01.25
申请国别(地区):
GB
年份:
2020
代理人:
摘要：
A detection system and method uses an implantable magnetic marker having at least one piece of a large Barkhausen jump material (LBJ). The marker is deployed to mark a tissue site in the body for subsequent surgery, and the magnetic detection system includes a handheld probe to excite the marker below the switching field for bistable switching of the marker causing a harmonic response to be generated in a sub-bistable mode that allows the marker to be detected and localised. The marker may be shorter than the critical length required to initiate bistable switching. Less than 5 mg of LBJ material is necessary and the marker may be less than 10 mm in length, made from microwire and have a three-dimensional shape (figure 9). The system may process the magnitude of one or more odd harmonics, even harmonics, a combination of both or the ratio of the harmonics to the fundamental frequency. A drive frequency in the range 1-100 kHz is used.
