Methods and systems for providing electromagnetic radiation to at least one portion of a sample using conformal laser therapy procedures

• US 10,426,548 B2
• Filed: 02/01/2007
• Issued: 10/01/2019
• Est. Priority Date: 02/01/2006
• Status: Active Grant

• Current Assignee: The General Hospital Corporation (Mass General Brigham, Inc.)
• Original Assignee: General Hospital Corporation
• Inventors: Tearney, Guillermo J., Shishkov, Milen, Bouma, Brett Eugene, Vakoc, Benjamin J.
• Primary Examiner(s): Nganga, Boniface N
• Application Number:
  US11/670,043
• Publication Number:
  US 20070282403A1
• Time in Patent Office: 4,625 Days
• CPC Class Codes: A61B 18/24 with a catheter A61B18/26, A61B18/28 take precedence
• CPC Class Codes: A61B 2017/00066 intensity
• CPC Class Codes: A61B 2017/22051 with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation A61B2017/22048, A61B2017/3486 take precedence
• CPC Class Codes: A61B 2018/2272 with reflective or refractive surfaces for deflecting the beam A61B2018/2261, A61B2018/2266 take precedence
• CPC Class Codes: A61B 5/0066 Optical coherence imaging

Abstract

According one exemplary embodiment of the present invention, method and system can be provided for applying a laser radiation to at least one portion of a biological structure. For example, a beam of the laser radiation can be provided to the portion, whereas a cross-sectional area of the beam is at most about 1/10th of an entire area of the at least one portion. The beam can be applied to the portion (a) based on a predetermined pattern, (b) while modulating a wavelength of the laser radiation, and/or (c) while monitoring a depth of the application of the laser radiation.

Claims

1. A process for applying a laser radiation to at least one portion of a biological structure, comprising:

a) providing a beam of the laser radiation to the at least one portion, wherein a cross-sectional area of the beam is at most about 1/10th of an entire area of the at least one portion;

b) applying the beam to the at least one portion (i) while modulating a wavelength of the laser radiation and (ii) while monitoring a depth of the application of the laser radiation;

c) receiving at least one return radiation from the at least one portion;

d) determining speckle information related to the at least one return radiation;

e) determining a laser damage depth within the biological structure based on the speckle information; and

f) adjusting a penetration depth of the beam by changing the wavelength of the laser radiation.

2. The process according to claim 1, wherein the laser radiation is provided to the at least one portion of the biological structure at the wavelength;

and further comprising;

g) during step (a), controlling a temperature distribution in the sample by modulating the wavelength of the laser radiation.

3. The process according to claim 1, wherein the beam is applied to the at least one portion while modulating at least one of a scanning speed or a power of the laser radiation.

4. The process according to claim 1,

wherein the beam has a first cross-sectional width of a first area of the biological structure in which at least 50% of power of the laser radiation is contained,

wherein, when the beam is applied to the biological structure along a predetermined path in the at least one portion, the beam of the laser radiation applied to a second area of the biological structure which has a second width and includes the predetermined path, wherein the second area is different from the first area, and

wherein the first and second widths are the same and are measured transverse to a translation direction of the beam.

5. The process according to claim 4, wherein the predetermined path is at least one of (i) helical, (ii) circular, or (iii) includes a set of parallel lines.

6. The process according to claim 1, wherein the beam has a shape such that an integration of a power of the laser radiation in a direction that is parallel to a scanning direction of the laser radiation is constant.

7. The process according to claim 1, further comprising shaping the beam using at least one aperture.

8. The process according to claim 1, further comprising modifying a shape of the beam to be non-circular.

9. The process according to claim 1, wherein the biological structure has a tubular shape.

10. The process according to claim 1, further comprising identifying at least one deformation in the at least one portion using the speckle information as a function of depth within the at least one portion.

11. A process for applying a laser radiation to at least one portion of a biological structure, comprising:

a) providing a beam of the laser radiation to the at least one portion, wherein a cross-sectional area of the beam is at most about 1/10th of an entire area of the at least one portion;

b) applying the beam to the at least one portion (i) while modulating a wavelength of the laser radiation and (ii) while monitoring a depth of the application of the laser radiation;

c) with the beam, causing a temperature change in a section of the biological structure which is near or in the at least one portion of the biological structure;

d) determining a phase-shift of at least one return radiation provided from the section;

e) identifying a deformation of the section at a plurality of depths as a function of the phase-shift of the at least one return radiation provided from the section;

f) determining a laser damage depth within the biological structure based on the deformation of the section at the plurality of depths; and

g) adjusting a penetration depth of the beam by changing the wavelength of the laser radiation.

12. A system for applying a laser radiation to at least one portion of a biological structure, comprising:

an optical configuration comprising an optical fiber configured to provide a beam of the laser radiation to the at least one portion, wherein a cross-sectional area of the beam is at most about 1/10th of an entire area of the at least one portion;

a beam configuration configured to apply the beam to the at least one portion (i) while modulating a wavelength of the laser radiation, and (ii) while monitoring a depth of the application of the laser radiation;

the optical configuration further configured to receive at least one return radiation from the at least one portion; and

a processor configured to;

determine a phase-shift of the at least one return radiation,

identify a deformation within the at least one portion at a plurality of depths as a function of the phase-shift of the at least one return radiation,

determine a laser damage depth within the biological structure based on the deformation within the at least one portion at the plurality of depths, and

adjust a penetration depth of the beam by changing the wavelength of the laser radiation.

13. The system according to claim 12, wherein the laser radiation is provided to the at least one portion of the sample at the wavelength;

and

the optical configuration being further configured to modulate the wavelength of the laser radiation when the beam is provided to the at least one portion to control a temperature distribution in the biological structure.

14. The system according to claim 12, wherein the beam is applied to the at least one portion while modulating at least one of a scanning speed or a power of the laser radiation.

15. The system according to claim 12,

wherein the beam has a first cross-sectional width of a first area of the biological structure in which at least 50% of power of the laser radiation is contained,

wherein, when the beam is applied to the biological structure along a predetermined path in the at least one portion, the beam of the laser radiation applied to a second area of the biological structure which has a second width and includes the predetermined path, wherein the second area is different from the first area, and

wherein the first and second widths are the same and are measured transverse to a translation direction of the beam.

16. The system according to claim 15, wherein the predetermined path is at least one of (i) helical, (ii) circular, or (iii) includes a set of parallel lines.

17. The system according to claim 12, wherein the beam has a shape such that an integration of a power of the laser radiation in a direction that is parallel to a scanning direction of the laser radiation is constant.

18. The system according to claim 12, further comprising an aperture to shape the beam.

19. The system according to claim 18, wherein the aperture shapes the beam to be noncircular.

20. The system according to claim 12, wherein the biological structure has a tubular shape.

21. A system for applying a laser radiation to at least one portion of a biological structure, comprising:

an optical configuration comprising an optical fiber configured to provide a beam of the laser radiation to the at least one portion, wherein a cross-sectional area of the beam is at most about 1/10th of an entire area of the at least one portion;

a beam configuration configured to apply the beam to the at least one portion (i) while modulating a wavelength of the laser radiation, and (ii) while monitoring a depth of the application of the laser radiation,

applying the beam causing a temperature change in a section of the sample which is near or in the at least one portion of the biological structure; and

a processor configured to;

determine a phase-shift of at least one return radiation provided from the section,

identify a deformation of the section at a plurality of depths as a function of the phase-shift of the at least one return radiation provided from the section,

determine a laser damage depth within the biological structure based on the deformation of the section at the plurality of depths, and

adjust a penetration depth of the beam by changing the wavelength of the laser radiation.