| 摘要 |
PCT No. PCT/SE90/00181 Sec. 371 Date Sep. 23, 1991 Sec. 102(e) Date Sep. 23, 1991 PCT Filed Mar. 21, 1990 PCT Pub. No. WO90/11051 PCT Pub. Date Oct. 4, 1990.An apparatus for comminuting concretions in a patient's body includes a liquid filled focusing chamber, defined by a reflector (2) with an inner wall having the form of an open revolution ellipsoid, which has its open end closed by a bellows (4,6) intended for placing against the patient's body. A spark gap (8) is disposed at the first focus (F1) of the ellipsoid reflector for generating a shock wave intended to be focused at the second focal area (F2) of the ellipsoid. The reflector wall thickness is formed such that resonance of the waves reflected on the inside and outside of the ellipsoid reflector occurs in said second focal area at a predetermined frequency. |
