US 12,357,417 B2
Magnetic marker set and method of arranging magnetic marker
Moriaki Kusakabe, Ibaraki (JP); Naoki Matsumoto, Tochigi (JP); Akio Ota, Tochigi (JP); and Masaki Sekino, Tokyo (JP)
Assigned to MATRIX CELL RESEARCH INSTITUTE INC., Ibaraki (JP)
Appl. No. 18/285,531
Filed by MATRIX CELL RESEARCH INSTITUTE INC., Ibaraki (JP)
PCT Filed Jul. 30, 2021, PCT No. PCT/JP2021/028332
§ 371(c)(1), (2) Date Oct. 4, 2023,
PCT Pub. No. WO2023/007702, PCT Pub. Date Feb. 2, 2023.
Prior Publication US 2024/0180440 A1, Jun. 6, 2024
Int. Cl. A61B 90/00 (2016.01)
CPC A61B 90/39 (2016.02) [A61B 2090/3925 (2016.02); A61B 2090/3954 (2016.02); A61B 2090/3987 (2016.02)] 19 Claims
OG exemplary drawing
 
1. A magnetic marker set comprising:
a magnetic marker including a first rod and a second rod each formed of a stick-shaped magnetic substance with residual magnetization characteristics, and a stick-shaped third rod; and
a needle with a hole in a longitudinal direction thereof, wherein
the magnetic marker further includes
a first connecting portion at which one longitudinal end of the first rod and one longitudinal end of the second rod are rotatably connected, and
a second connecting portion at which an other longitudinal end of the second rod and one longitudinal end of the third rod are rotatably connected,
the magnetic marker is inserted into the hole and has been magnetized such that an orientation of a magnetic field reverses at the first connecting portion, and
the magnetic marker set further includes
a draw-in mechanism that has a thread arranged in the hole and brings an other longitudinal end of the first rod and an other longitudinal end of the third rod close to each other when the magnetic marker is extruded from the hole,
a cutting portion, including at least an edge configured to cut the thread, and
an inner tube arranged in the hole and an inner-inner tube arranged in the inner tube,
the magnetic marker is positioned so as to be extruded from the hole in the order of the first rod, the second rod, and the third rod, with one end of the thread being fixed to the other longitudinal end of the first rod, and the thread being movably held at the other longitudinal end of the third rod,
the cutting portion is constituted by an inner tube side hole formed in a side of the inner tube and an inner-inner tube side hole formed in a side of the inner-inner tube,
when the inner tube side hole and the inner-inner tube side hole are placed at a position in which the inner tube side hole and the inner-inner tube side hole face each other, the thread passes through the inner tube side hole and the inner-inner tube side hole, and
the thread is cut by placing the inner tube side hole and the inner-inner tube side hole at a position in which the inner tube side hole and the inner-inner tube side hole do not face each other.