System for effecting and controlling oscillatory pressure within balloon catheters for fatigue fracture of calculi

Patent metadata

Field	Value
Publication number	US-11464949-B2
Application number	US-201916654073-A
Country	US
Kind code	B2
Filing date	Oct 16, 2019
Priority date	Apr 12, 2018
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A dynamic balloon angioplasty system for applying a dynamic pressure to fracture hardened materials embedded within an elastic conduit. The system having a pressure source system outputting at least a first predetermined pressure from a pressure source outlet, and an angioplasty unit fluidly coupled to the pressure source outlet receiving at least the first predetermined pressure. The angioplasty unit having an angioplasty inflation device, an angioplasty balloon connector, and an oscillating mechanism selectively actuated to output a plurality of pressure pulses to the angioplasty balloon via a fluid communication path. A control system is configured to determine an optimal hydraulic pressure oscillation frequency and amplitude for a given procedure and output a control signal to the oscillating mechanism, and monitor a pressure signal to detect fracture of the hardened material within the elastic conduit or system failure or leakage.

First claim

What is claimed is:

1. A dynamic balloon angioplasty system for applying a dynamic pressure to fracture or modify hardened materials embedded within an elastic conduit, the dynamic balloon angioplasty system comprising:
a pressure source system configured to output at least a first predetermined pressure from a pressure source outlet;
an angioplasty unit being fluidly coupled to the pressure source outlet to receive at least the first predetermined pressure, the angioplasty unit having an angioplasty inflation device and a balloon connector operably coupled to and extending from the angioplasty inflation device, the balloon connector being configured to be connectable to an angioplasty balloon for delivering a plurality of pressure pulses to the angioplasty balloon;
an oscillating mechanism fluidly coupled to the pressure source outlet and the angioplasty balloon via a fluid communication path and being selectively actuated to receive pressure from the pressure source outlet and output the plurality of pressure pulses to the angioplasty balloon via the fluid communication path;
a pressure transducer operably coupled to the fluid communication path, the pressure transducer measuring a fluid pressure within the fluid communication path and outputting a pressure signal; and
a control system operably coupled to at least one of the pressure source system and the oscillating mechanism, the control system configured to determine an optimal hydraulic pressure oscillation frequency and amplitude for a given procedure and output a control signal to the oscillating mechanism, the control system further configured to accept a user-defined peak pressure value to limit a peak pressure within the angioplasty balloon, the control system further configured to monitor the pressure signal to detect fracture of the hardened material within the elastic conduit or system failure or leakage.

2. The dynamic balloon angioplasty system according to claim 1 , wherein the pressure source system comprises:
at least one pressure tank having a pressurized fluid at a pressure higher than a peak balloon pressure; and
a pressure outlet system operably coupled between the at least one pressure tank and the oscillating mechanism.

3. The dynamic balloon angioplasty system according to claim 2 , wherein the pressure source system is configured to output pressure between 0 to 300 atm.

4. The dynamic balloon angioplasty system according to claim 1 wherein the angioplasty unit, the pressure transducer, and a display device are operably coupled in a unitary assembly, the unitary assembly being releasably connectable to the pressure source system.

5. The dynamic balloon angioplasty system according to claim 1 wherein the angioplasty unit, the pressure transducer, and the control system are operably coupled in a unitary assembly.

6. The dynamic balloon angioplasty system according to claim 1 wherein the angioplasty unit, the pressure transducer, and a display device are operably coupled in a unitary assembly, the unitary assembly being releasably connectable to the pressure source system.

7. The dynamic balloon angioplasty system according to claim 1 further comprising a display device operably coupled to at least one of the pressure source system and the angioplasty unit.

8. The dynamic balloon angioplasty system according to claim 7 wherein the display device is wirelessly coupled to at least one of the pressure source system and the angioplasty unit.

9. The dynamic balloon angioplasty system according to claim 1 wherein the angioplasty unit further comprises an ejectable and exchangeable power supply.

10. The dynamic balloon angioplasty system according to claim 1 wherein the pressure source system comprises a pressure-regulated high-pressure gas source.

11. The dynamic balloon angioplasty system according to claim 1 wherein the control system is configured to monitor the pressure signal to detect fracture or modification of the hardened material within the elastic conduit by determining an overall diminution of pressure due to an increase in volume of the balloon.

12. The dynamic balloon angioplasty system according to claim 1 wherein the control system is configured to monitor the pressure signal to detect fracture of the hardened material within the elastic conduit by comparing pressure oscillations before and after the fracture, the pressure oscillations being at a lower average pressure than before the fracture.

13. The dynamic balloon angioplasty system according to claim 1 wherein the control system is configured to determine an optimal hydraulic pressure oscillation frequency and optimal hydraulic pressure magnitude for a given procedure and output a control signal to the oscillating mechanism.

14. The dynamic balloon angioplasty system according to claim 1 wherein the angioplasty inflation device is a lockable screw-piston-type syringe.

15. The dynamic balloon angioplasty system according to claim 1 , wherein the first predetermined pressure comprises a pressure between 2 to 300 atm.

16. The dynamic balloon angioplasty system according to claim 1 , wherein the system is configured so the angioplasty balloon is inflated at a frequency of between 2 to 40 Hz.

17. The dynamic balloon angioplasty system according to claim 1 , wherein the system is configured so a peak pressure in the angioplasty balloon is substantially the same as the fluid pressure within the fluid communication path.

18. The dynamic balloon angioplasty system according to claim 1 , wherein the balloon connector is configured to reduce flow resistance of delivering the plurality of pressure pulses to the angioplasty balloon.

19. The dynamic balloon angioplasty system according to claim 18 , wherein the balloon connector comprises an expanded flow channel or a stiffened catheter shaft or a braided catheter shaft.

20. The dynamic balloon angioplasty system according to claim 1 , wherein the oscillating mechanism comprises a solenoid valve and deformable diaphragm system fluidly coupled to the pressure source outlet, the solenoid valve being configured to switch from a high-state to a low-state, in the high-state, a high-pressure from the pressure source outlet is connected to the deformable diaphragm that separates a pressure source side and a hydraulic side, in the low-state, the pressure source side is exhausted to atmospheric pressure, the solenoid valve selectively outputting the first predetermined pressure and a second predetermined pressure from the pressure source outlet.

21. The dynamic balloon angioplasty system according to claim 20 , wherein the deformable diaphragm is a spring-loaded elastic diaphragm configured to accelerate depressurization of the angioplasty balloon.

22. A dynamic balloon angioplasty system for applying a dynamic pressure to fracture hardened materials embedded within an elastic conduit, the dynamic balloon angioplasty system comprising:
a pressure source system configured to output at least a first predetermined pressure from a pressure source outlet, the pressure source system being selectively actuated to output a plurality of pressure pulses;
an angioplasty unit being fluidly coupled to the pressure source outlet to receive the plurality of pressure pulses, the angioplasty unit having an angioplasty inflation device and a balloon connector operably coupled to and extending from the angioplasty inflation device, the balloon connector being configured to be connectable to an angioplasty balloon for delivering

Assignees

• Univ Michigan Regents

Inventors

• Chisena Robert
• Gurm Hitinder S
• Hildner Matthew
• Zheng Yihao
• Shih Albert

Classifications

• A61B2017/00154

  pulsed · CPC title

• A61M25/10184

  Means for controlling or monitoring inflation or deflation · CPC title

• A61B2017/22051

  with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation (A61B2017/22048, A61B2017/3486 take precedence) · CPC title

• A61B2017/00539

  hydraulically · CPC title

• A61M25/10185

  Valves · CPC title