Patent ID: 8308745
Filing Date: 2012-11-13
Classification: A61B

Abstract:
1. A fluid jet device that is provided with a fluid jet aperture section and produces a jet of fluid that is ejected from the device into an ambient pressure environment at an exit aperture that is formed in the fluid jet aperture section, the device comprising: a pulsation generation section including (i) a fluid chamber whose capacity can be changed, (ii) an inlet fluid path having an upstream path end and a downstream path end, the downstream path end of the inlet fluid path being adjacent to and opening into the fluid chamber, the inlet fluid path having a total volume smaller than that of the fluid chamber, (iii) an outlet fluid path having an upstream path end and a downstream path end, the upstream path end of the outlet fluid path being adjacent to and opening into the fluid chamber and the downstream path end terminating at the exit aperture of the fluid jet aperture section, the outlet fluid path having an inertance that is smaller than that of the inlet fluid path, (iv) a first sidewall configuring member defining a first sidewall of the fluid chamber that extends in a direction parallel to the primary direction of fluid flow through the fluid chamber, (v) a second sidewall configuring member defining a second sidewall of the fluid chamber that extends in the direction parallel to the primary direction of fluid flow through the fluid chamber, and (vi) a diaphragm that defines another wall of the fluid chamber, wherein at least either the inlet fluid path or the outlet fluid path comprises a fluid pathway that is defined by a surface of the first sidewall configuring member, and wherein the surface of the first sidewall configuring member and a surface of the second sidewall configuring member are substantially parallel to the diaphragm, and the surface of the first sidewall configuring member abuts the surface of the second sidewall configuring member; and a pressure generation section that supplies the fluid to the inlet fluid path; wherein inertance L is defined as where ρ is fluid density, h is fluid path length, and S is fluid path cross-sectional area.