Therapeutic foam

• US 8,048,439 B2
• Filed: 05/13/2005
• Issued: 11/01/2011
• Est. Priority Date: 11/17/2003
• Status: Active Grant

• Current Assignee: Boston Scientific Medical Device Limited (Boston Scientific Corporation)
• Original Assignee: BTG International Limited (Boston Scientific Corporation)
• Inventors: Harman, Anthony David, Jenkins, William John, Van Liew, Hugh, Kadar, Adil, Wright, David Dakin Iorwerth, Robinson, Nikki, Hodges, Garry, Moggridge, Geoffrey D.
• Primary Examiner(s): Richter; Johann
• Assistant Examiner(s): Holt; Andriae M
• Application Number:
  US11/128,265
• Publication Number:
  US 20070003489A1
• Time in Patent Office: 2,363 Days
• Field of Search: 424/423
• US Class Current: 424/423
• CPC Class Codes: A61K 9/122 Foams; Dry foams edible foams A61K9/0056

Abstract

A therapeutic foam for the treatment of, inter alia, varicose veins comprises a sclerosing solution foamed with a physiological gas such as carbon dioxide, oxygen or a mixture thereof. The foam has a nitrogen content of less than 0.8%. It may be generated using a pressurized canister system incorporating a fine mesh of micron dimensions through which the gas and sclerosing liquid are passed to make the foam. Alternatively, the foam may be generated by passing gas and solution between two syringes through a fine mesh. Techniques are described for minimizing the amount of nitrogen in a canister or syringe based product. A technique for generating and delivering foam simultaneously using a syringe based device is also disclosed.

Claims

1. A method for angiologic treatment comprising injecting a foam comprising a liquid phase and a gas phase wherein

the liquid phase comprises at least one sclerosing agent and

the gas phase consists essentially of gaseous nitrogen present in an amount ranging from 0.01% to 0.8% by volume, xenon gas in an amount greater than 5% and a physiologically acceptable gas mixture comprising 10% to 90% vol/vol carbon dioxide with the remaining gas oxygen into veins to be treated.

2. The method of claim 1 comprising having a patient breathe oxygen or an oxygen enriched atmosphere prior to injecting the foam.

3. The method for phlebologic treatment comprising injecting a foam comprising a liquid phase and a gas phase wherein

the liquid phase comprises at least one sclerosing agent and

the gas phase consists essentially of gaseous nitrogen present in an amount ranging from 0.01% to 0.8% by volume, xenon gas in an amount greater than 5% and a physiologically acceptable gas mixture comprising 10% to 90% vol/vol carbon dioxide with the remaining gas oxygen into veins to be treated.

4. The method of claim 3 comprising having a patient breathe oxygen or an oxygen enriched atmosphere prior to injecting the foam.

5. The method of claim 4, wherein a greater saphenous vein of one leg of a human patient is treated by a single injection of foam.

6. The method of claim 5, wherein the single injection uses an amount ranging from 10 ml to 50 ml.

7. The method of claim 6, wherein the single injection uses an amount ranging from 10 ml to 40 ml.

8. The method of claim 7, wherein the single injection uses an amount ranging from 15 ml to 30 ml.