Patent ID: 7923897
Filing Date: 2011-04-12
Classification: A61M

Abstract:
1. A sonic fine-hole apparatus for forming a fine-hole in a surface of a membrane or solid body in a liquid by means of sonic energy, said sonic fine-hole forming apparatus comprising a sonic oscillation driving signal generator configured to generate a voltage waveform which has positive and negative voltage portions that arc asymmetrical, and the positive and negative portions each having a sharp peak portion, a sonic oscillation section defining an interior cavity housing a sonic oscillation element and a fluid surrounding said sonic oscillation element, said sonic oscillation element being a sonic transducer configured to deliver sonic energy and driven by said oscillation driving signal generator, said sonic oscillation section having a surface formed by a covering layer defining said interior cavity and said covering layer having an electrically insulating property and a sonic transparency, said covering layer being formed to have a thickness of 10 μm or more and to be continuous without openings so as to seal the interior cavity of the sonic oscillation section from an environment exterior to said covering layer and contain the membrane or solid body.