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Akira Ishikawa, Nabuo Takeda, Suzanne I Ahn, Samuel S Ahn, Steven R Hays, F Andrew Gaffney: Miniature implanted orthopedic sensors. Ball Semiconductor, Howison Thoma & Arnott L, September 10, 2002: US06447448 (488 worldwide citation)

A substantially spherical semiconductor ball implanted in orthopedic structures for sensing and/or stimulation. In one embodiment, a vertebral column (


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Akira Ishikawa, Nabuo Takeda, Suzanne I Ahn, Samuel S Ahn, Steven R Hays, F Andrew Gaffney: Wireless EKG. Ball Semiconductor, Howison Chauza Thoma Handley & Arnott L, September 25, 2001: US06295466 (65 worldwide citation)

A wireless electrocardiogram monitor utilizing a cooperative association of miniature semiconductor balls. A side view of a surface mount cardiac monitor system (


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