Ultrasonic transducer probe expansion chamber

• US 4,784,148 A
• Filed: 02/21/1986
• Issued: 11/15/1988
• Est. Priority Date: 02/21/1986
• Status: Expired due to Term

• Current Assignee: Johnson & Johnson Ultrasound Incorporated
• Original Assignee: Johnson & Johnson
• Inventors: Meyers, Paul F., Dow, Julian
• Primary Examiner(s): Jaworski, Francis J.
• Application Number:
  US06/831,787
• Time in Patent Office: 998 Days
• Field of Search: 128/660, 128/661, 73/627, 73/633, 73/639
• US Class Current: 600/446
• CPC Class Codes: G10K 11/02 Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
• CPC Class Codes: G10K 11/355 Arcuate movement

Abstract

An ultrasonic transducer probe is provided which utilizes a pivoting transducer to perform an ultrasonic sector scan. The transducer and its drive mechanisms are contained within a fluid chamber. A portion of the wall of the fluid chamber includes a flexible bellows, which expands and contracts as pressure and temperature changes alter the fluid volume, thereby altering the fluid chamber volume.

Claims

1. An ultrasonic transducer probe comprising:

a forward located assembly including a pivotally mounted ultrasonic transducer;

a motor, located to the rear of and connected to said assembly, for controllably moving the transducer to radiantly transmit ultrasonic energy; and

an acoustic couplant fluid chamber, enclosing said motor and assembly and including a cap assembly defining a forward hemispheric fluid compartment containing said transducer at the forward end, a rearward located cylinder defining a rearward fluid compartment and having a sealed rearward end and an open forward terminus, and a flexible, cylindrical bellows in fluid-tight connection between said cap assembly defining said hemispheric fluid compartment and said open forward terminus of said cylinder which defines an intermediate fluid compartment of sufficient cross-sectional area to enclose said motor, said cap assembly, bellows, and cylinder defining a contiguous longitudinal acoustic couplant fluid chamber, wherein said bellows comprises means for restricting volumetric variation of said acoustic couplant fluid chamber in response to thermal expansion and contraction of said fluid to longitudinal volumetric variation of said chamber.

2. The ultrasonic transducer probe of claim 1, wherein said flexible bellows circumferentially surrounds at least a portion of said motor and transducer assembly.

3. The ultrasonic transducer probe of claim 2, wherein said bellows includes a first end fixedly mounted with respect to said transducer assembly, and a second end which is capable of movement with respect to said transducer assembly.

4. The ultrasonic transducer probe of claim 2, wherein said pivotally mounted transducer opposes said cap assembly which is fixedly located with respect to said transducer assembly, and said motor opposes said cylinder, said cylinder being capable of movement with respect to said transducer assembly as said bellows flexes.

5. The ultrasonic transducer probe of claim 4, wherein said flexible bellows includes a first end located near said cap assembly and a second end remotely located from said cap assembly, and further comprising

a fluid seal, located at said first end of said flexible bellows, for confining acoustic couplant fluid within said fluid chamber.

6. The ultrasonic transducer probe of claim 1, wherein said cylinder includes an electrical connector, mounted in said rearward end, for making electrical connections between the interior and the exterior of said fluid chamber.

7. The ultrasonic transducer probe of claim 6, further comprising a hollow housing which encloses said flexible bellows and at least a portion of said cylinder, said bellows and cylinder being capable of movement within said housing.

8. The ultrasonic transducer probe of claim 7, further including a fluid seal located between the exterior of said bellows and the interior of said housing.

9. The ultrasonic transducer probe of claim 1, wherein said flexible bellows comprises means for varying the separation between said cap assembly and said cylinder as the bellows flexes.

10. The ultrasonic transducer probe of claim 9, wherein said motor is positioned so as to be surrounded by said bellows.

11. The ultrasonic transducer probe of claim 9, wherein said cap assembly includes an ultrasonic aperture and said end of said cylinder includes an electrical connector.