US 12,226,266 B2
Systems and methods for detecting magnetic markers for surgical guidance
Tiziano Agostinelli, Cambridge (GB); Kevin Lorimer, Cambridge (GB); and Quentin John Harmer, Cambridge (GB)
Assigned to ENDOMAGNETICS LTD, (GB)
Filed by ENDOMAGNETICS LTD, Cambridge (GB)
Filed on Apr. 24, 2023, as Appl. No. 18/138,600.
Application 18/138,600 is a continuation of application No. 16/256,404, filed on Jan. 24, 2019, granted, now 11,660,160.
Claims priority of application No. 1801224 (GB), filed on Jan. 25, 2018.
Prior Publication US 2023/0329834 A1, Oct. 19, 2023
Int. Cl. A61B 90/00 (2016.01); A61B 5/06 (2006.01); A61B 34/20 (2016.01); G01D 5/20 (2006.01); A61B 17/00 (2006.01)
CPC A61B 90/39 (2016.02) [A61B 5/062 (2013.01); A61B 5/064 (2013.01); A61B 34/20 (2016.02); G01D 5/20 (2013.01); A61B 2017/00867 (2013.01); A61B 2017/00876 (2013.01); A61B 2034/2051 (2016.02); A61B 2090/3908 (2016.02); A61B 2090/3925 (2016.02); A61B 2090/3954 (2016.02); A61B 2090/3958 (2016.02); A61B 2090/3966 (2016.02); A61B 2090/397 (2016.02); A61B 2090/3987 (2016.02); A61B 2505/05 (2013.01); A61B 2562/0223 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A detection system for locating a marker in a body, the detection system comprising:
an implantable marker;
a drive coil arranged to excite the marker with an alternating magnetic field at a first frequency between 10 KHz and 40 KHz; and
a sense coil arranged to detect a signal received from the excited marker;
a magnetic field generator configured to drive an alternating magnetic field through the drive coil; and
a detector configured to receive the signal from the sense coil, wherein the sense coil detects a harmonic signal response from the marker at a second frequency of less than 100 KHz.