Ultrasonic internal examination system

• US 5,131,396 A
• Filed: 06/21/1991
• Issued: 07/21/1992
• Est. Priority Date: 06/25/1990
• Status: Expired due to Fees

• Current Assignee: Fuji Photo Optical Co. Ltd (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Optical Co. Ltd (Fujifilm Holdings Corporation)
• Inventors: Ishiguro, Masaaki, Takagi, Yukio, Tanaka, Toshizumi
• Primary Examiner(s): Jaworski, Francis
• Assistant Examiner(s): MANUEL, GEORGE C
• Application Number:
  US07/718,642
• Time in Patent Office: 396 Days
• Field of Search: 128/660.01, 128/660.09, 128/660.1, 128/662.03, 128/662.06
• US Class Current: 600/459
• CPC Class Codes: A61B 8/12 in body cavities or body tracts, e.g. by using catheters catheters per se A61M25/00
• CPC Class Codes: A61B 8/445 Details of catheter construction
• CPC Class Codes: A61B 8/4461 Features of the scanning mechanism, e.g. for moving the transducer within the housing of the probe

Abstract

Described herein is an ultrasonic internal examination system of the type having a rigid tip portion at the distal end of an ultrasonic probe to be inserted into an intracavitary portion of interest, and an ultrasonic vibratory element accommodated in a cavity formed in the rigid tip portion and filled with an ultrasonic transmissive medium for transmission and reception of signals. The rigid tip portion is formed with a cylindrical shaped outer configuration and internally defines a cavity having a radially concave curved inner wall surface of a predetermined radius of curvature on the inner periphery thereof.

Claims

1. An ultrasonic internal examination apparatus, which comprises:

a probe having an insert section with a rigid tip portion at a distal end thereof for being inserted into an intracavitary portion of interest, said tip portion having a substantially spherically shaped cavity and a substantially cylindrical outer profile such that said insert section has a substantially uniform diameter over the length thereof;

an ultrasonic vibratory element positioned in said cavity; and

an ultrasonic transmissive medium of a predetermined acoustic impedance located in said cavity for transmission and reception of ultrasonic signals and for forming an acoustic lens wherein said cavity has an inner wall surface of a substantially circular shape along an axial cross-section thereof for focusing of said ultrasonic signals transmitted from said vibratory element.

2. The ultrasonic internal examination apparatus as defined in claim 1, which comprises means for acoustically masking at least a portion of wall surfaces on the inner periphery of said rigid tip portion.