Blood flow bypass catheters and methods for the delivery of medium to the vasculature and body ducts

• US 8,255,193 B2
• Filed: 11/24/2009
• Issued: 08/28/2012
• Est. Priority Date: 02/16/2005
• Status: Active Grant

• Current Assignee: University of Virginia Patent Foundation (University of Virginia)
• Original Assignee: University of Virginia Patent Foundation (University of Virginia)
• Inventors: Humphrey, Joseph A. C., Gillies, George T.
• Primary Examiner(s): Skowronek, Karlheinz R
• Application Number:
  US12/625,153
• Publication Number:
  US 20100160896A1
• Time in Patent Office: 1,008 Days
• Field of Search: None
• US Class Current: 703/9
• CPC Class Codes: A61M 2025/105 having a balloon suitable for drug delivery, e.g. by using holes for delivery, drug coating or membranes
• CPC Class Codes: A61M 25/0026 Multi-lumen catheters with stationary elements catheter assemblies comprising a catheter in combination with a guide tube, sheath or sleeve A61M2025/0681; catheters comprising telescoping coaxial elements A61M2025/0175
• CPC Class Codes: A61M 25/10 Balloon catheters A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02; inflatable balloons for placing stents or stent-grafts A61F2/958 ; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00
• CPC Class Codes: A61M 25/1011 Multiple balloon catheters
• CPC Class Codes: A61M 5/007 for contrast media

Abstract

A catheterization device that may be designed by use of an adaptive genetic algorithm computational fluid dynamics approach, as well as other Global Optimization methods that may include simulated annealing, multistart and interval methods, continuous branch and bound methods, evolutionary algorithms, and tabu search and scatter search methods, as well as other available Global Optimization methods that is able to maximize/optimize the dwell time of an infused agent in the vicinity of a vascular lesion. The device may have an internal by-pass channel that allows the blood upstream of the lesion to continue its pulsatile flow through the vessel in the part of it occluded by the lesion, while simultaneously allowing the disbursement and maximal dwell time of an antithrombolytic or other diagnostic or therapeutic agent needed to treat the lesion. Different embodiments of the catheterization device are disclosed and indications for the use of these devices in the treatment of vascular diseases are discussed.

Claims

1. A method for generating a configuration of elements of a catheter device, said catheter device comprising passages for blood flow and medium flow and inlet and exit ports for blood flow and medium flow, said method comprising:

selecting variables including;

a) geometrical shapes and dimensions of said blood passages and said medium passages,

b) relative locations and orientations of flow planes of at least some of said inlet ports and exit ports; and

c) concentration and residence time of medium in the vicinity of a specific location outside said catheter device; and

applying a global optimization algorithm using a computer to the variables to generate a catheter with optimized flow conditions,

wherein, a position of said inlet ports and said exit ports is determined by application of the global optimization algorithm.

2. The method of claim 1, wherein said variables further comprise:

velocity components, vorticity components, pressure, and/or concentration of blood and/or medium at specific locations of blood and/or medium inside and outside of the catheter device.

3. The method of claim 1, wherein said variables further comprise-shear stresses and/or vorticity components of the flow of the blood and/or medium inside and outside said catheter device.

4. The method of claim 3, wherein the specific location outside said catheter device being located in the vasculature or tubular body duct.

5. The method of claim 3, wherein said variables further comprise at least one of:

Reynolds, Schmidt and/or Pulsating Flow parameters for the blood and/or medium.

6. The method of claim 1, wherein said method further comprises applying constraints to said generation comprising at least one of:

a) maximum or minimum allowed sizes of the catheter and/or dimensions said passages;

b) maximum allowed flow speeds and/or shear stresses;

c) maximum allowed pressure drop and skin friction;

e) maximum allowed medication concentration; and

f) overall expected elapsed time needed for treatment.

7. The method of any one of claims 1, 2, 3, 5 and 6, wherein said global optimization algorithm comprises a genetic algorithm.

8. The method of any one of claims 1, 2, 3, 5 and 6, wherein said global optimization algorithm comprises at least one of simulated annealing, multistart and interval methods, continuous branch and bound methods, evolutionary algorithms, and tabu search and scatter search methods.

9. The method of claim 1, wherein the medium comprises at least one of agent, substance, material, thrombolytic agents, clot lysis agents, chemotherapies, cell slurries, gene therapy vectors, growth factors, contrast agents, angiogenesis factors, radionuclide slurries, anti-infection agents, anti-tumor compounds, receptor-bound agents and/or other types of drugs, therapeutic agent and/or diagnostic agent.

10. A computer program product comprising a non-transitory computer useable storage medium having computer program logic for enabling at least one processor in a computer system to generate a configuration of elements on a catheter device, said catheter device comprising passages for blood flow and medium flow and inlet and exit ports for blood flow and medium flow, said computer program logic comprising:

selecting variables-including;

a) geometrical shapes and dimensions of at least some of said blood passages and said medium passages,

b) relative locations and orientations of flow planes of at least some of said inlet ports and exit ports; and

c) concentration and residence time of medium in the vicinity of a specific location outside said catheter device; and

applying a global optimization algorithm to the variables to generate a catheter with optimized flow conditions,

wherein, a position of said inlet ports and said exit ports is determined by application of the global optimization algorithm.

11. The computer program product of claim 10, wherein said variables further comprise:

velocity components, vorticity components, pressure, and/or concentration of blood and/or medium at specific locations of blood and/or medium inside and outside of the catheter device.

12. The computer program product of claim 10, wherein said variables further comprise

shear stresses and/or voracity components of the flow of the blood and/or medium inside and outside said catheter device.

13. The computer program product of claim 12, wherein the specific location outside said catheter device being located in the vasculature or tubular body duct.

14. The computer program product of claim 12, wherein said variables further comprise at least one of:

Reynolds, Schmidt and/or Pulsating Flow parameters for the blood and/or medium.

15. The computer program product of claim 10, wherein said method further comprises applying constraints to said generation comprising at least one of:

a) maximum or minimum allowed sizes of the catheter and/or dimensions of said passages;

b) maximum allowed flow speeds and/or shear stresses;

c) maximum allowed pressure drop and skin friction;

e) maximum allowed medication concentration; and

f) overall expected elapsed time needed for treatment.

16. The computer program product of any one of claims 10, 11, 12, 14 and 15, wherein said global optimization algorithm comprises a genetic algorithm.

17. The computer program product of any one of claims 10, 11, 12, 14 and 15, wherein said global optimization algorithm comprises at least one of simulated annealing, multistart and interval methods, continuous branch and bound methods, evolutionary algorithms, and tabu search and scatter search methods.