Method and apparatus for diagnostic medical information gathering, hyperthermia treatment, or directed gene therapy

• US 6,368,275 B1
• Filed: 10/07/1999
• Issued: 04/09/2002
• Est. Priority Date: 10/07/1999
• Status: Expired due to Term

• Current Assignee: Siemens Medical Solutions USA Incorporated (Siemens AG)
• Original Assignee: Acuson Corporation (Siemens AG)
• Inventors: Sliwa, John W., Dreschel, William R.
• Primary Examiner(s): Jaworski, Francis J.
• Application Number:
  US09/414,235
• Time in Patent Office: 915 Days
• Field of Search: 600/437-438, 600/485-486, 600/488, 600/458, 600/549, 600/302, 735/70, 735/73--74, 735/79, 374/100, 374/117, 601/3
• US Class Current: 600/437
• CPC Class Codes: A61B 2562/028 Microscale sensors, e.g. electromechanical sensors [MEMS]
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00

Abstract

A micro-instrument suitable for property imaging in a body is less than one millimeter in each dimension. The micro-instrument includes a base having a first wall and a second wall, the second wall substantially circumscribing the first wall, and a lid connected with the base to form a cavity and the lid being temporarily deformable. Optionally, the lid can include a cantilever that is deformable. Also optionally, an electronic circuit can be attached with the micro-instrument. The micro-instrument can also be substantially spherical. An observable property of the micro-instrument varies as a function of a physiological property of the body.

Claims

1. A micro-mechanical device for admission into a body and for communicating medical diagnostic information, comprising:

a leadless micro-instrument particle having an observable property that varies as a function of a physiological property;

said micro-instrument having a maximum dimension of one millimeter and a cantilever on a surface of the micro-instrument particle, the cantilever operable to generate the observable property as an acoustic signal.

2. The device of claim 1 wherein the observable property comprises a property observable in a modality selected from the group consisting of:

ultrasound, magnetic resonance, computerized axial tomography, PET, x-rays and optical imaging.

3. The device of claim 1 wherein the micro-instrument particle comprises a particle shaped as a function of lithography and at least one of deposition and etching.

4. The device of claim 1 wherein the micro-instrument particle comprises a material selected from the group consisting of:

silicon, oxides of silicon, nitrides of silicon, metallic thinfilms, ceramic, glass and combinations thereof.

5. The device of claim 1 wherein the observable property varies as a function of a temperature in a body.

6. The device of claim 1 wherein the observable property varies as a function of a pressure in a body.

7. The device of claim 1 wherein the cantilever is responsive to the physiological property.

8. The device of claim 1 wherein the micro-machine particle comprises a solid state sensor operative to sense the physiological property.

9. The device of claim 1 wherein the observable property comprises an acoustic response characteristic.

10. The device of claim 1 wherein the observable property comprises electromagnetic information.

11. The device of claim 1 wherein the observable property comprises optical information.

12. The device of claim 1 wherein the micro-instrument particle comprises:

a structure comprising a base, a lid connected with the base to form a cavity and the cantilever on at least one of the lid and base.

13. The device of claim 1 wherein the micro-instrument particle is less than twenty-five microns in each dimension.

14. A medical diagnostic ultrasound system for observing a physiological property of a body, the system comprising:

a transducer operable to transmit energy into the body;

a plurality of micro-instrument particles having an observable property responsive to the ultrasonic energy, the observable property varying as a function of the physiological property of the body; and

a receive beamformer operable to receive signals responsive to the micro-instrument particles along a scan line.

15. The system of claim 14 wherein the transmitted energy comprises ultrasonic energy and the observable property comprises an acoustic response to the ultrasonic energy.

16. The system of claim 14 wherein the observable property comprises an electromagnetic response.

17. The system of claim 14 wherein the plurality of micro-instrument particles each comprise a particle shaped as a function of lithography and at least one of deposition and etching.

18. The system of claim 14 wherein the plurality of micro-instrument particles each comprise a material selected from the group consisting of:

silicon, oxides of silicon, nitrides of silicon, metallic thin films, ceramic, glass and combinations thereof.

19. The system of claim 14 wherein the observable property varies as a function of temperature.

20. The system of claim 14 wherein the observable property varies as a function of pressure.

21. The system of claim 14 wherein the plurality of micro-instrument particles each comprise a deformable member, the deformation responsive to the physiological property.

22. The system of claim 14 wherein the plurality of micro-instrument particles each comprise a solid state sensor capable of sensing the physiological property.

23. The system of claim 14 wherein the plurality of micro-instrument particles each comprise:

a structure comprising a base, a lid connected with the base to form a cavity and at least a portion of at least one of the lid and base being deformable.

24. The system of claim 14 wherein the plurality of micro-instrument particles are each less than twenty-five microns in each dimension.

25. A medical diagnostic method for gathering information representing a physiological property of a body, the method comprising the steps of:

(a) administering at least one micro-instrument particles into the body, at least one of said particles responsive to an initiation signal;

(b) generating an initiation signal; and

(c) generating in response to the initiation signal an observable property signal from at least one micro-instrument particle that varies as a function of a physiological property of the body;

(d) receiving signal information responsive to the observable property external to the body; and

(e) generating a property or map image as a function of the information.

26. The method of claim 25 wherein (b) comprises transmitting an ultrasound signal and (c) comprises generating an observable acoustical property signal in response to the ultrasound signal.

27. The method of claim 26 wherein (c) comprises generating the observable acoustical property signal by vibrating a deformable portion of at least one micro-instrument particle.

28. The method of claim 25 wherein (c) comprises generating the observable signal in response to a temperature property of the body.

29. The method of claim 25 wherein (c) comprises generating the observable signal in response to a pressure property of the body.

30. The method of claim 25 further comprising:

(f) administering medically diagnostic or therapeutic agent or drug from at least one micro-instrument particle as a function of the physiological property.

31. The method of claim 30 wherein (f) comprises rupturing a compartment of the micro-instrument particle.

32. The method of claim 25 wherein (c) comprises generating an observable electromagnetic property signal.

33. The method of claim 25 further comprising:

(f) sensing the physiological property with a solid-state sensor integrated in at least one of said micro-instrument particles.

34. The method of claim 25 wherein the observable property signal of some of the micro-instrument particles varies as a function of a first value of the physiological property and the observable property of others of the micro-instrument particles varies as a function of a second, different value of the physiological property.

35. The method of claim 33 wherein (c) includes transmitting an unique identification signal from each micro-instrument particle.

36. The method of claim 25 wherein the image comprises a temperature map of a portion of the body.

37. The method of claim 25 wherein the image comprises a pressure map of a portion of the body.

38. The method of claim 25 further comprising:

(f) correcting (b) for aberration as a function of the information.

39. The method of claim 25 wherein:

the observable property is temperature and a temperature map is generated in support of a thermal therapy.

40. A micro-mechanical device for admission into a body and for communicating medical diagnostic information, comprising:

a leadless micro-instrument particle having an observable property that varies as a function of a physiological property, the observable property consisting of a property selected from the group of;

harmonic frequency of a signal, amplitude of a plurality of signals, on-off output operation and combinations thereof;

said micro-instrument having a maximum dimension of one millimeter.