Abstract
To excise the non-palpable breast lesion, conventionally surgeons estimate the excision margin by naked eyes subjectively with a localization tool such as a hook wire. By introducing a magnetic detection system, location of the magnetic marker injected intratumorally can be identified with a handheld magnetic probe. Detection ranges of existing magnetic markers are up to 30 mm, limiting applications on tumors located deeper down the skin. In this study, materials and designs of magnetic markers are evaluated to achieve an extended detection range. Stainless steel (SUS) 304 is magnetic and biocompatible for an implant device, and a SQUID measurement is performed to evaluate its magnetic properties. A numerical simulation tool has been developed to evaluate the magnetic field strength induced by the magnetic marker from any orientation. Based on a backward-facing hook shape design, magnetic field strength induced by the marker with varies hook length and separation angle between the hook and the main body is evaluated. At an extended distance of 40 mm, the detection of the magnetic marker with 8 mm hook length and 75° separation angle can be achieved on 57% of the orientations.
Highlights
Breast cancer is the most commonly occurring cancer in women and the second most common cancer overall
A numerical simulation tool has been developed to evaluate the magnetic field strength induced by the magnetic marker from any orientation
At an extended distance of 40 mm, the detection of the magnetic marker with 8 mm hook length and 75○ separation angle can be achieved on 57% of the orientations
Summary
Breast cancer is the most commonly occurring cancer in women and the second most common cancer overall. Surgeon removes the primary tumor with some surrounding breast tissue, leaving as much normal breast as possible to achieve a good cosmetic outcome. To perform this surgery, since tumor is not visible from skin surface, a marker is necessary to locate the tumor. The external part of the wire is left out of skin and is taped to the skin, which no doubt lead to patient discomfort. This is causing the risk of the hook wire migration relative to the tumor scitation.org/journal/adv location. Surgeons estimate the position of the hook tip by naked eyes, which leads to a re-excision rate as high as 58%.3
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