High-Intensity Ultrasonic Vessel Ablator Using Blood Flow Signal for Precise Positioning

• US 20090264755A1
• Filed: 04/22/2008
• Published: 10/22/2009
• Est. Priority Date: 04/22/2008
• Status: Abandoned Application

• Current Assignee: National Taiwan University (Government of The Republic of China)
• Original Assignee: National Taiwan University (Government of The Republic of China)
• Inventors: Wu, Chih-Ching, Ho, Ming-Chih, Lee, Po-Huang, Chen, Chiung-Nien, Chen, Wen-Shiang
• Application Number:
  US12/107,723
• Publication Number:
  US 20090264755A1
• Time in Patent Office: Days
• US Class Current: 600/439
• CPC Class Codes: A61B 2017/00106 ultrasonic
• CPC Class Codes: A61B 2017/00128 related to intensity or progress of surgical action
• CPC Class Codes: A61B 2090/378 using ultrasound
• CPC Class Codes: A61B 8/4483 characterised by features of the ultrasound transducer
• CPC Class Codes: A61N 7/02 Localised ultrasound hyperthermia hyperthermia in general A61F7/00

Abstract

The present invention relates to a precise blood vessel positioning and high-intensity focused ultrasound ablator by use of one ultrasound transducer.

Claims

1. A ultrasonic diagnostic and therapeutic system, which utilizes high-intensity focused ultrasound for ablating blood vessels and blocking blood flow, comprising:

(1) an ultrasound transducer module, for diagnosis and therapy, comprising a focused ultrasound transducer and a plastic device;

(2) a diplexer module coupled to the ultrasound transducer module, for transmitting diagnostic ultrasound, receiving echo signals (Doppler signals) from blood flow in response to the transmitted ultrasound and delivering therapeutic ultrasound;

(3) a diagnostic processor coupled to the diplexer module, for producing diagnostic control signals and responsive to the echo signals for identifying a location of blood flow in real time; and

(4) a therapeutic processor coupled to the diplexer module, for producing therapeutic control signals.

2. The ultrasonic diagnostic and therapeutic system according to claim 1, wherein the focused ultrasound transducer sustains high energy input and transmits high-intensity ultrasound for ablation therapy.

3. The ultrasonic diagnostic and therapeutic system according to claim 1, wherein the plastic device is mounted at the tip of the focused ultrasound transducer, and switched to different types to adjust the distance between the skin and the focused ultrasound transducer.

4. The ultrasonic diagnostic and therapeutic system according to claim 3, wherein the plastic device comprises an ultrasound-permeable membrane that enables the plastic device to be filled with ultrasound-conductible media.

5. The ultrasonic diagnostic and therapeutic system according to claim 1, wherein the diplexer module receiving signals from the diagnostic processor under low energy power levels controls the transmission of ultrasound through the ultrasound transducer module to the identified area.

6. The ultrasonic diagnostic and therapeutic system according to claim 1, wherein the diplexer module receiving signals from the therapeutic processor under high energy power levels is operable to deliver high intensity focused ultrasound through the ultrasound transducer to the target area.

7. The ultrasonic diagnostic and therapeutic system according to claim 1, wherein the diagnostic processor comprises a Doppler signal processor responsive to the receipt of Doppler echo signals (Doppler frequency difference) for identifying and verifying a location of blood motion and monitoring the therapeutic efficacy.

8. The ultrasonic diagnostic and therapeutic system according to claim 7, wherein the Doppler signal processor is responsive to the echo signal resulting from the flow velocity.

9. The ultrasonic diagnostic and therapeutic system according to claim 1, further comprising an audible emitter responsive to the diagnostic processor which is actuated indicating the location of blood flow and guiding the placement of the ultrasound transducer through varying loudness and frequencies.

10. A method for ablating selected vascular regions to block the blood flow by using the ultrasonic diagnostic and therapeutic system according to claim 1, comprising the steps of:

(1) affixing an ultrasound transducer module to a selected position;

(2) identifying the appropriate treatment site to be heated with a ultrasound transducer module operated at diagnostic power levels (low energy levels);

(3) using high intensity focused ultrasound to heat the identified site of blood flow with a ultrasound transducer operated at therapeutic power levels (high energy levels);

(4) verifying the position and monitoring the efficacy with a ultrasound transducer operated at diagnostic power levels during heating; and

(5) repeating the step of heating, if required,

wherein the steps of identifying, verifying and monitoring are performed with a focused ultrasound transducer and the step of heating are also performed with the same focused ultrasound transducer.

11. The method according to claim 10, if required, further comprising the step of analyzing the image to identify and select the at least one blood vessel by using 2D or 3D imaging ultrasound prior to entire treatment process.

12. The method according claim 10, wherein the steps of identifying, verifying and monitoring are using voice feedback transformed from Doppler echo signals resulting from the blood flow of the target.