Ingemar LundquistIngemar Henry Lundquist was a Swedish inventor and mechanical engineer. He became an American citizen in 1950.Early life and educationLundquist graduated from the KTH [Royal Institute of Technology|Stockholm Institute of Technology] in 1945 with a mechanical engineering degree. He migrated to the United States in 1948 and became an American citizen in 1950.CareerHe worked for various medical technology companies in the San Francisco Bay Area, including Advanced Cardiovascular Systems and E.P.Technologies.PatentsLundquist had hundreds of inventions, typically working in his garage or basement. He held more than a hundred patents. His inventions included over-the-wire balloon angioplasty, Transurethral [needle ablation of the prostate|T.U.N.A.], and somnoplasty. He also worked on cardiac stem-cell therapy.