Vapor ablation systems and methods

Patent metadata

Field	Value
Publication number	US-11896287-B2
Application number	US-202117646129-A
Country	US
Kind code	B2
Filing date	Dec 27, 2021
Priority date	Dec 18, 2015
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

A vapor delivery needle is provided that may include any of a number of features. One feature of the energy delivery probe is that it can apply condensable vapor energy to tissue, such as a prostrate, to shrink, damage, denaturate the prostate. In some embodiments, the vapor delivery needle can be advanced a predetermined distance into the prostate with a solenoid actuation mechanism. Methods associated with use of the energy delivery probe are also covered.

First claim

What is claimed is:

1. A prostate treatment device, comprising:
an introducer shaft:
a vapor generator configured to generate a condensable vapor;
a vapor delivery needle in communication with the vapor generator and movably disposed within the introducer shaft;
a magnet attached to the needle;
a solenoid actuator disposed around the magnet, wherein the solenoid actuator comprises a first winding and a second winding; and
a power supply configured to simultaneously supply a first current to the first winding and a second current to the second winding in order to move a distal tip of the vapor delivery needle between a retracted position inside the introducer shaft and an extended position at least partially outside of the introducer shaft, wherein the first current is in a first direction opposite to a second direction of the second current, wherein the first winding is configured to generate a first magnetic field when the first current is applied to the first winding, and wherein the second winding is configured to generate a second magnetic field when the second current is applied to the second winding.

2. The device of claim 1 , wherein the first magnetic field shares a polarity with the magnet.

3. The device of claim 2 wherein the second magnetic field has a polarity opposite to the polarity of the magnet.

4. The device of claim 1 , wherein the first magnetic field generates a first force on the magnet.

5. The device of claim 4 , wherein the second magnetic field generates a second force on the magnet in a same direction as the first force.

6. The device of claim 5 , wherein a magnitude of a combination of the first force and the second force is approximately twice a magnitude of the first force alone.

7. The device of claim 1 , wherein the magnet is at least partly within both of the first winding and the second winding in a retracted position of the vapor delivery needle.

8. The device of claim 1 , further comprising a sensor configured to provide a voltage output proportional to a magnetic field produced by the magnet.

9. A prostate treatment device, comprising:
an introducer shaft;
a vapor generator configured to generate a condensable vapor;
a vapor delivery needle in communication with the vapor generator and slidably disposed within the introducer shaft a magnet attached to the needle; and
an actuator configured to selectively simultaneously apply to the magnet a first, repelling, force in a first direction and a second, attracting force in the first direction in order to move a distal tip of the vapor delivery needle between a retracted position inside the introducer shaft and an extended position at least partially outside of the introducer shaft, wherein the actuator includes a second magnet configured to generate a first magnetic field having a first polarity and a third magnet configured to generate a second magnetic field having a second polarity, and wherein the first polarity is opposite to the second polarity.

10. The device of claim 9 , wherein the first magnetic field produces the first force, and wherein the second magnetic field produces the second force.

11. The device of claim 9 , wherein a magnitude of a combination of the first force and the second force is approximately twice a magnitude of the first force alone.

12. The device of claim 9 , further comprising a sensor configured to provide a voltage output proportional to a magnetic field produced by the first magnet.

13. A prostate treatment device, comprising:
an introducer shaft;
a vapor generator configured to generate a condensable vapor;
a vapor delivery needle in communication with the vapor generator and slidably disposed within the introducer shaft;
a magnet attached to the needle;
a solenoid actuator disposed around the magnet, wherein the solenoid actuator comprises a first winding and a second winding; and
a power supply configured to supply at least one current to the solenoid actuator, wherein the supply of the at least one current simultaneously causes (a) the first winding to generate a first magnetic field having a first polarity, and (b) the second winding to generate a second magnetic field having a second polarity, wherein the first polarity is opposite to the second polarity, wherein the first magnetic field shares a polarity with the magnet, and wherein the second magnetic field has a polarity opposite to a polarity of the magnet.

14. The device of claim 13 , wherein the first magnetic field generates a first force on the magnet, wherein the second magnetic field generates a second force on the magnet, and wherein the second force is in a same direction as the first force.

15. The device of claim 14 , wherein a magnitude of a combination of the first force and the second force is approximately twice a magnitude of the first force alone.

16. The device of claim 13 , wherein the magnet is at least partly within both of the first winding and the second winding in a retracted position of the vapor delivery needle.

17. The device of claim 13 , further comprising a sensor configured to provide a voltage output proportional to a magnetic field produced by the first magnet.

Assignees

• Boston Scient Scimed Inc

Inventors

• Hastings Roger Noel
• Schrom Mark
• Carlson Steven
• Hoey Michael
• Byland Timothy D
• Woo Karliam C
• Bachmeier Brian A

Classifications

• A61B18/14 Primary

  Probes or electrodes therefor · CPC title

• A61B18/04 Primary

  by heating (by applying electromagnetic radiation A61B18/18) · CPC title

• A61B18/042

  using additional gas becoming plasma · CPC title

• F22B1/28

  in boilers heated electrically · CPC title

• H01F7/13

  characterised by pulling-force characteristics · CPC title