Ultrasonic probe having flexible stabilizing element for probe alignment
A stabilized ultrasonic probe includes a housing, at least one ultrasonic transducer, a flexible delay line, and a stabilizing element. The housing can be tubular and extend from a proximal to a distal end and define a cavity therein. The transducer can be positioned within the housing. The delay line can include recessed and tip portions. The recessed portion can be within the cavity and extend from the transducer(s) to the housing distal end. The tip portion can extend from the housing distal end to a distal terminal end of the delay line. The stabilizing element can be coupled to the housing distal end and extend distally from the housing distal end to a target facing surface. The stabilizing element can circumferentially surround at least part of the delay line tip portion. A stabilizing element modulus can be greater than or equal to a delay line modulus.
1. An ultrasonic probe, comprising:
a housing extending from a proximal end to a distal end and defining a first cavity therein;
at least one ultrasonic transducer positioned within the housing;
a flexible delay line including a recessed portion and a hemispherical tip portion, wherein the recessed portion is positioned within the cavity and extends from the at least one ultrasonic transducer to the distal end of the housing, and wherein the tip portion extends from the distal end of the housing to a distal terminal end of the delay line; and
a stabilizing element coupled to the distal end of the housing and extending distally from the distal end of the housing to a target facing surface, wherein the stabilizing element circumferentially surrounds at least part of the tip portion of the flexible delay line
wherein an elastic modulus of the material from which the stabilizing element is formed is greater than or equal to an elastic modulus of the delay line.
2. The ultrasonic probe of claim 1 , wherein the housing and the stabilizing element are generally tubular and the stabilizing element defines a second cavity in which the tip portion is positioned, wherein a diameter of the stabilizing element is approximately equal to a diameter of the housing.
3. The ultrasonic probe of claim 1 , wherein the stabilizing element is a spring.
4. The ultrasonic probe of claim 3 , wherein a diameter of the spring is approximately equal to a diameter of the housing.
5. The ultrasonic probe of claim 1 , wherein the housing includes a circumferential cavity positioned therein and extending proximally from the distal end of the housing and the stabilizing element includes:
a spring extending between a proximal end and a distal end, wherein at least a portion of the spring is positioned within the circumferential cavity; and
a tube coupled to the distal end of the spring, wherein a diameter of the tube is approximately equal to a diameter of the circumferential cavity.
6. The ultrasonic probe of claim 5 , wherein the tube is rigid.
7. The ultrasonic probe of claim 5 , wherein a spring constant of the spring is configured such that an effective elastic modulus of the stabilizing element is approximately equal to or greater than elastic modulus of the delay line.
8. The ultrasonic probe of claim 5 , wherein a spring constant of the spring in combination with an elastic modulus of the tube is configured such that an effective elastic modulus of the stabilizing element is approximately equal to or greater than a stiffness of the delay line.
9. The ultrasonic probe of claim 1 , wherein the elastic modulus of the material from which the stabilizing element is formed is within the range from about 0.01 GPa to about 0.2 GPa.
10. The ultrasonic probe of claim 1 , wherein the delay line is formed from a solid and has an elastic modulus within the range from about 0.01 GPa to about 0.2 GPa.
11. The ultrasonic probe of claim 1 , wherein the delay line is a formed from a liquid and has a compression modulus within the range from about 0.8 GPa to about 4.5 GPa.
12. The ultrasonic probe of claim 11 , wherein the liquid is an ultrasonic couplant.
13. The ultrasonic probe of claim 1 , wherein the at least one ultrasonic transducer is a single ultrasonic transducer.
14. The ultrasonic probe of claim 1 , wherein the at least one ultrasonic transducer is an array including a plurality of linear ultrasonic transducers.
15. The ultrasonic probe of claim 1 , wherein the at least one ultrasonic transducer is a two-dimensional matrix array including a plurality of ultrasonic transducers.
16. The ultrasonic probe of claim 1 , wherein the tip portion of the flexible delay line extends a first distance from the distal end of the housing and the stabilizing element extends a second distance from the distal end of the housing, the first distance greater than the second distance.
17. The ultrasonic probe of claim 1 , wherein the housing and the stabilizing element are generally polygonal.