Amniocentesis needle with improved sonographic visibility

Details Amniocentesis needle with improved sonographic visibility Amniocentesis needle with improved sonographic visibility

1988-08-17

1990-12-18

Hindenburg, Max

Surgery

Truss

Pad

128763, A61B 814

Patent

active

049778978

ABSTRACT:
Disclosed is a medical cannula or amniocentesis needle of improved sonographic visibility. The invention comprises a needle or cannula having one or more sounding apertures formed therein. The diameter of each sounding aperture is substantially equal to a predetermined wavelength of an incident ultrasonic beam. As a result, the beam will diffract upon striking the sounding aperture and the resultant echo will ddiffuse isotropically therefrom, thereby improving the ultrasonic detectability thereof.

REFERENCES:
patent: 4058114 (1977-11-01), Soldner
patent: 4308875 (1982-01-01), Young
patent: 4401124 (1983-08-01), Guess et al.
patent: 4428379 (1984-01-01), Robbins et al.
patent: 4582061 (1986-04-01), Fry
J. Ultrasound Med. 5.000-000, "Laboratory Assessment of Ultrasonic Needle and Catheter Visualization" by John P. McGahan, M.D., Jul. 1986, 5 pages.

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