Direct vision cryosurgical probe and methods of use
A direct vision cryosurgical and methods of use are described herein where the device may generally comprise an elongated rigid structure with a distal end, a proximal end, and a central lumen. The distal end may comprise a non-coring optically transparent needle tip with at least one lateral fenestration in communication with the central lumen. The distal end may also house at least one imaging device configured for distal imaging. A proximal end of the device may comprise a handle with a means for connecting the imaging device(s) to an imaging display(s), and a means for accessing bodily tissue in the vicinity of the distal end with a cryo-ablation probe through the central lumen and the lateral fenestration(s) for diagnostic or therapeutic purposes.
1. A cryosurgical probe, comprising:
an elongated structure with a proximal end and a distal end;
a cryo-ablation element disposed at the distal end of the elongated structure, wherein the cryo-ablation element includes an inflatable balloon structure comprising an outer balloon, wherein an inner cryo balloon and an insulation balloon are disposed within the outer balloon, and wherein the inflatable balloon structure includes a tissue freezing zone configured to cryogenically ablate a tissue region; and
a cryogen tube configured to introduce a cryogen into the outer balloon from a cryogenic fluid source fluidly coupled to the inflatable balloon structure and to deliver the cryogen to the tissue freezing zone via the inner cryo balloon, wherein the insulation balloon prevents cryo-ablation of another tissue region.
2. The cryosurgical probe of claim 1 , further comprising:
an imaging sensor disposed within the inflatable balloon structure of the cryo-ablation element, wherein the imaging sensor facilitates positioning the tissue freezing zone at the tissue region.
3. The cryosurgical probe of claim 2 , wherein the imaging sensor is disposed within the inflatable balloon structure when the cryogen tube introduces the cryogen into the inflatable balloon structure and delivers the cryogen to the tissue freezing zone.
4. The cryosurgical probe of claim 2 , wherein the imaging sensor is configured to detect visible or non-visible light.
5. The cryosurgical probe of claim 1 , wherein the inflatable balloon structure is configured to dilate tissue surrounding the tissue region prior to the cryogen tube introducing the cryogen into the inflatable balloon structure and delivering the cryogen to the tissue freezing zone.
6. The cryosurgical probe of claim 1 , wherein the cryogen tube is configured to introduce the liquid cryogen into the outer balloon from the cryogenic fluid source, such that the outer balloon is inflated independently of inflating the inner cryo balloon.
7. The cryosurgical probe of claim 1 , wherein the cryogen tube introduces the liquid cryogen into the inflatable balloon structure by spraying the liquid cryogen from an array of cryogen nozzles towards an inner wall of the inner cryo balloon corresponding to the tissue freezing zone to evaporate the liquid cryogen in the inner cryo balloon, and wherein the inner cryo balloon is inflated as a result of evaporation of the liquid cryogen within the inner cryo balloon.
8. The cryosurgical probe of claim 7 , wherein the inner cryo balloon and the insulation balloon are configured to be inflated and conform to an inner surface of the outer balloon.
9. The cryosurgical probe of claim 7 , wherein the inflatable balloon structure is configured to be deflated by venting evaporated cryogen from the inner cryo balloon.
10. The cryosurgical probe of claim 9 , wherein the elongated structure includes a first lumen and a second lumen extending in the elongated structure between the proximal end and the distal end of the elongated structure,
wherein introducing the liquid cryogen into the inflatable balloon structure comprises supplying the liquid cryogen to the inflatable balloon structure using the first lumen, and
wherein deflating the inflatable balloon structure comprises venting the evaporated cryogen from the inflatable balloon structure using the second lumen.
11. The cryosurgical probe of claim 10 , wherein the first lumen and the second lumen are coaxial with each other.
12. The cryosurgical probe of claim 1 , further comprising one or more sensors configured to detect temperature, cardiac signals, bodily fluid chemistry, dissecting force, fluid pressure, ionizing radiation, non-visible light, or a magnetic field.
13. The cryosurgical probe of claim 1 , wherein the insulation balloon prevents cryo-ablation along a radial segment of the inflatable balloon structure.
14. The cryosurgical probe of claim 1 , further comprising:
a therapeutic energy emitting device mounted within the cryosurgical probe; and
an electric connector configured to connect the therapeutic energy emitting device to a source of therapeutic energy.
15. The cryosurgical probe of claim 1 , wherein the control of flow of the cryogen through the cryogen tube is based on feedback from a sensor.
16. The cryosurgical probe of claim 1 , further comprising:
a pressure relief valve configured to vent evaporated cryogen to an ambient environment while maintaining a set pressure within the inflatable balloon structure.
17. The cryosurgical probe of claim 16 , wherein the set pressure of the pressure relief valve is used to maintain inflation and tissue dilation force for the inflatable balloon structure to maintain a spatial separation between tissue targeted for freezing and tissue intended to be protected from freezing by the insulation balloon.
18. The cryosurgical probe of claim 16 , wherein the pressure relief valve has a user adjustable pressure setting within a range of pressures that are lower than a burst strength of the inflatable balloon structure.
19. The cryosurgical probe of claim 16 , wherein the pressure relief valve is configured to generate an audible indication of a volumetric flow rate of evaporated cryogen exiting the pressure relief valve to the ambient environment.