Device for interstitial laser therapy

1. A system for interstitial laser therapy, the system comprising:

a device for interstitial laser therapy comprising:

an optical waveguide extending along a central longitudinal axis and having an optical output end;

an optical diffuser optically coupled to the optical output end and extending along the central longitudinal axis,

wherein the optical diffuser comprises a housing having an open end for receiving the optical output end and a first longitudinal portion of the optical waveguide, and

wherein the optical diffuser is provided with one or more holes, one or more slits, one or more openings, and/or one or more vents; and

a first temperature sensor interposed between the central longitudinal axis and an exterior surface of the housing within a longitudinal extent of the first longitudinal portion of the optical waveguide;

a power-tunable optical source optically coupled to the optical waveguide; and

a processing system configured to:

obtain a temperature measurement from the first temperature sensor; and

adjust an optical output power of the optical source.

2. The system of claim 1 , wherein the first temperature sensor is interposed between the first longitudinal portion of the optical waveguide and the housing.

3. The system of claim 1 , wherein the housing is a tubular housing.

4. The system of claim 3 , wherein an outer diameter of the housing is greater than or equal to an outer diameter of the optical waveguide.

5. The system of claim 3 , wherein an inner diameter of the housing is greater than or equal to an outer diameter of the optical waveguide.

6. The system of claim 1 , wherein gases generated during use escape out from an inside region of the optical diffuser and an irrigation fluid cools the optical diffuser via the one or more holes, the one or more slits, the one or more openings, and/or the one or more vents.

7. The system of claim 1 , wherein the first temperature sensor is selected from the group of a micro-temperature sensor, an integrated temperature sensor, a thermocouple, and an infrared temperature sensor.

8. The system of claim 1 , wherein the optical waveguide is an optical fibre.

9. The system of claim 1 , wherein the device further comprises a second temperature sensor, attached to the optical waveguide within a second longitudinal portion of the optical waveguide.

10. The system of claim 1 , wherein the first temperature sensor is positioned adjacent to or abutting an internal surface of the optical diffuser.

11. The system of claim 1 , further comprising a cannula for delivering the device to a treatment region.

12. The system of claim 11 , wherein at least an end portion of the cannula is transparent or semi-opaque.

13. The system of claim 11 , wherein the cannula includes an irrigation inlet to receive an irrigation fluid.

14. The system of claim 13 , wherein the irrigation fluid is transported to an operational zone which includes the optical diffuser.

15. The system of claim 14 , wherein the irrigation fluid exits the cannula at an outlet such that an ablation zone from laser energy is limited in extent to beyond the outlet by the irrigation fluid.

16. The system of claim 11 , further including a stiffener inserted into the cannula.

17. The system of claim 11 , wherein the cannula includes or is attached to a trocar or a sharp end.

18. The system of claim 17 , wherein the trocar is transparent or semi-opaque and is optically coupled to the optical output end, such that the trocar provides a further optical diffuser.

19. The system of claim 17 , wherein the trocar has a closed end and the trocar includes an irrigation inlet to receive an irrigation fluid.

20. A system for interstitial laser therapy comprising:

a device for interstitial laser therapy comprising:

an optical waveguide extending along a central longitudinal axis and having an optical output end;

an optical diffuser optically coupled to the optical output end and extending along the central longitudinal axis, wherein:

the optical diffuser comprises a housing having an open end for receiving the optical output end and a first longitudinal portion of the optical waveguide, and

the optical diffuser is provided with one or more holes, one or more slits, one or more openings, and/or one or more vents;

a first temperature sensor interposed between the central longitudinal axis and an exterior surface of the housing within a longitudinal extent of the first longitudinal portion of the optical waveguide; and

a second temperature sensor attached to the optical waveguide within a second longitudinal portion of the optical waveguide

a power-tunable optical source optically coupled to the optical waveguide; and

a processing system configured to:

obtain temperature measurements from the first temperature sensor and from the second temperature sensor; and

adjust an optical output power of the optical source.

21. The system of claim 20 , wherein the second temperature sensor is arranged adjacent to the open end of the optical diffuser.

22. The system of claim 20 , wherein the first temperature sensor and the second temperature sensor are adapted to measure a temperature difference.

23. The system of claim 20 , wherein the second temperature sensor is adapted to measure a second temperature external to the optical diffuser.

24. The system of claim 20 , wherein the central longitudinal axis does not intersect with the first temperature sensor and/or the second temperature sensor.

25. The system of claim 20 , wherein the first temperature sensor and/or the second temperature sensor are/is positioned apart from the optical output end.

26. The system of claim 20 , wherein the second temperature sensor is positioned outside the longitudinal extent of the optical diffuser.