US 12,092,708 B2
Magnetic probe apparatus
Simon Richard Hattersley, Bickley (GB)
Assigned to ENDOMAGNETICS LTD., Cambridge (GB)
Filed by ENDOMAGNETICS LTD., Cambrdige (GB)
Filed on Jan. 31, 2023, as Appl. No. 18/103,828.
Application 18/103,828 is a continuation of application No. 16/859,355, filed on Apr. 27, 2020, granted, now 11,592,501.
Application 16/859,355 is a continuation of application No. 12/631,370, filed on Dec. 4, 2009, granted, now 10,634,741, issued on Apr. 28, 2020.
Prior Publication US 2023/0176152 A1, Jun. 8, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/05 (2021.01); A61B 5/00 (2006.01); A61B 5/06 (2006.01); A61K 49/18 (2006.01); B82Y 5/00 (2011.01); G01R 33/12 (2006.01); A61B 17/00 (2006.01)
CPC G01R 33/1269 (2013.01) [A61B 5/05 (2013.01); A61B 5/065 (2013.01); A61B 5/415 (2013.01); A61B 5/418 (2013.01); A61B 5/4312 (2013.01); A61K 49/1863 (2013.01); B82Y 5/00 (2013.01); A61B 2017/00876 (2013.01); A61B 2562/12 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A probe comprising:
a cylindrically shaped handheld probe body comprising a first order gradiometer, the handheld probe body having an axis,
the first order gradiometer comprising a first sense coil having a first radius and a second sense coil having a second radius; and
a drive coil positioned between the first sense coil and the second sense coil,
the drive coil having a third radius,
wherein the first sense coil, the second sense coil, and the drive coil are disposed along the axis of the handheld probe body, the drive coil disposed between the first sense coil and the second sense coil,
wherein the first sense and the second sense coils are operable to generate equal and opposite currents in response to a magnetic field produced by the drive coil,
wherein the third radius is smaller than the first radius and the second radius.