Stacked transducing devices

• US 8,345,513 B2
• Filed: 12/03/2008
• Issued: 01/01/2013
• Est. Priority Date: 12/03/2007
• Status: Active Grant

• Current Assignee: Kolo Medical, Ltd.
• Original Assignee: Kolo Technologies, Inc.
• Inventors: Huang, Yongli
• Primary Examiner(s): Alsomiri, Isam
• Assistant Examiner(s): HULKA, JAMES R
• Application Number:
  US12/745,749
• Publication Number:
  US 20100246332A1
• Time in Patent Office: 1,490 Days
• Field of Search: 367/181
• US Class Current: 367/181
• CPC Class Codes: A61B 2562/028 Microscale sensors, e.g. electromechanical sensors [MEMS]
• CPC Class Codes: A61B 8/06 Measuring blood flow measuring volume flow in general G01F, e.g. G01F1/66, G01F1/72; measuring speed of fluids in general G01P5/00
• 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 8/4488 the transducer being a phased array
• CPC Class Codes: A61N 1/37217 characterised by the communication link, e.g. acoustic or tactile
• CPC Class Codes: A61N 2007/0052 using the same transducer for therapy and imaging
• CPC Class Codes: A61N 7/02 Localised ultrasound hyperthermia hyperthermia in general A61F7/00
• CPC Class Codes: B06B 1/0292 Electrostatic transducers, e.g. electret-type

Abstract

Implementations include a capacitive micromachined ultrasonic transducer (CMUT) having an additional transducing device overlaid in a vertically stacked relationship. In some implementations the additional transducing device is a second CMUT configured to operate at a different frequency from the first CMUT.

Claims

1. A probe comprising:

a first capacitive micromachined ultrasonic transducer (CMUT) mounted on the probe; and

a second CMUT contiguous with the first CMUT in a stacked relationship, the second CMUT including a plate, wherein the plate is rigid relative to a first frequency of acoustic energy and flexible relative to a second frequency of acoustic energy.

2. The probe according to claim 1, wherein the first CMUT is configured to operate within the first frequency of acoustic energy and the second CMUT is configured to operate within the second frequency of acoustic energy.

3. The probe according to claim 1, wherein the first CMUT comprises:

a first electrode;

a second electrode separated from the first electrode by a first gap maintained by one or more first supports; and

a spring member for enabling the first electrode and the second electrode to move toward and away from each other due, at least in part, to the first gap.

4. The probe according to claim 3, wherein:

the second CMUT comprises the second electrode and a third electrode; and

the third electrode is separated from the second electrode by a second gap on the opposite side of the second electrode from the first electrode, the second gap being maintained by one or more second supports.

5. The probe according to claim 4, wherein the third electrode is mounted on the plate such that flexing of the plate enables the third electrode to move toward and away from the second electrode due, at least in part, to the second gap.

6. The probe according to claim 3, wherein:

the third electrode is formed as at least part of the plate, the plate overlying the second electrode and the spring member, and separated therefrom by a second gap maintained by one or more second supports;

flexing of the plate allows the third electrode to move toward and away from the second electrode.

7. The probe according to claim 3, wherein:

the second CMUT comprises the second electrode and a third electrode;

the third electrode is separated from the second electrode by a second gap on the opposite side of the second electrode from the first electrode, the second gap being maintained by one or more second supports; and

the third electrode is located primarily over one or more of the first supports such that operation of the second CMUT has minimal effect on operation of the first CMUT.

8. The probe according to claim 1, wherein the first CMUT and the second CMUT share a common middle electrode.

9. The probe according to claim 1, wherein:

the first CMUT is connected to a reception circuit to receive acoustic energy; and

the second CMUT is connected to a transmission circuit to transmit acoustic energy.

10. The probe according to claim 1, wherein the first CMUT and the second CMUT are connected to a circuit for selectively connecting the first CMUT and second CMUT to:

a transmission circuit for enabling the first CMUT and second CMUT to transmit acoustic energy;

or

a reception circuit for enabling the first CMUT and the second CMUT to receive acoustic energy.

11. The probe according to claim 1 wherein:

the first CMUT and the second CMUT are connected in parallel;

first CMUT is connected to a first circuit for selectively connecting the first CMUT to one of a first transmission circuit or a first reception circuit; and

the second CMUT is connected to a second circuit for selectively connecting the second CMUT to one of a second transmission circuit or a second reception circuit.

12. The probe according to claim 1, wherein:

the first CMUT is configured as an imaging transducer for providing a field of view of tissue during a surgical procedure; and

the second CMUT is configured to focus ultrasonic energy on a desired area of tissue for carrying out tissue ablation during the surgical procedure.

13. The probe according to claim 1, wherein:

the first CMUT is configured as an imaging transducer for providing imaging at a first operation frequency range that includes the first frequency of acoustic energy; and

the second CMUT is configured as an imaging transducer for providing imaging at a second operation frequency range, different from the first operation frequency range, the second operation frequency range including the second frequency of acoustic energy.

14. The probe according to claim 1, further comprising at least one of a flow sensor or a temperature sensor located on the plate of the second CMUT.

15. The probe according to claim 1, further comprising a pressure sensor located on the plate of the second CMUT.

16. A probe comprising:

a first electrode;

a second electrode separated from the first electrode by a first gap;

a spring member and one or more first supports for maintaining the first gap between the first electrode and the second electrode, wherein the first electrode and the second electrode are able to move toward or away from each other at least in part by flexing of the spring member; and

a third electrode separated from the second electrode by a second gap on an opposite side of the second electrode from the first electrode, wherein;

a first capacitive micromachined ultrasonic transducer (CMUT) comprises the first and second electrode;

a second CMUT comprises the second electrode and the third electrode; and

the first CMUT and the second CMUT are addressed separately such that the first CMUT is configured for a first operation frequency for achieving imaging in a first imaging field and the second CMUT is configured for a second operation frequency for achieving imaging in a second imaging field, different from the first imaging field.

17. The probe according to claim 16, wherein:

the second electrode is a first plate;

the third electrode is contiguous with a second plate that is separated from the first plate by one or more second supports; and

the second plate is rigid relative to the first operation frequency and flexible relative to the second operation frequency.

18. The probe according to claim 16, wherein:

the second electrode is contiguous with the spring member;

the third electrode is associated with a plate separated from the second electrode and the spring member by one or more second supports; and

the plate is rigid relative to the first operation frequency and flexible relative to the second operation frequency.

19. The probe according to claim 18, wherein the third electrode is located over one or more of the first supports such that movement of the third electrode toward and away from the second electrode has minimal effect on relative movement between the first and second electrodes.

20. The probe according to claim 16,

wherein the first electrode and the second electrode comprise a first capacitive micromachined ultrasonic transducer (CMUT);

wherein the second electrode and the third electrode comprise a second CMUT; and

wherein the second electrode is connected to a bias or voltage source and serves as a common electrode to the first and second CMUTs.

21. A probe comprising:

a first transducer mounted on the probe; and

a second transducer contiguous with the first transducer in a stacked relationship, wherein the first transducer and the second transducer are addressed separately such that the first transducer is configured for a first operation frequency for achieving imaging in a first field of view and the second transducer is configured for a second operation frequency for achieving imaging in a second field of view, different from the first field of view.

22. The probe according to claim 21, wherein:

the first transducer is a first capacitive micromachined ultrasonic transducer (CMUT) and

the second transducer is a second CMUT including a plate that is rigid relative to the first operation frequency and flexible relative to the second operation frequency.

23. The probe according to claim 21, wherein the first operation frequency is for low resolution imaging and the second operation frequency is for high resolution imaging.