Device and method for treatment of wounds with nitric oxide

• US 7,520,866 B2
• Filed: 07/13/2006
• Issued: 04/21/2009
• Est. Priority Date: 12/26/2000
• Status: Expired due to Term

• Current Assignee: Advanced Inhalation Therapies (AIT) Ltd, Sensormedics Corporation (Becton, Dickinson & Co)
• Original Assignee: Sensormedics Corporation (Becton, Dickinson & Co), Pulmonox Technologies Corp.
• Inventors: Miller, Chris C, Stenzler, Alex
• Primary Examiner(s): Stephens; Jacqueline F.
• Application Number:
  US11/487,600
• Publication Number:
  US 20070088316A1
• Time in Patent Office: 1,013 Days
• Field of Search: 604/23, 604/290, 604/25, 604/543, 604/540, 604/289, 424/718, 514/579, 514/645
• US Class Current: 604/23
• CPC Class Codes: A61B 90/40 Apparatus fixed or close to patients specially adapted for providing an aseptic surgical environment
• CPC Class Codes: A61H 33/14 Devices for gas baths with ozone, hydrogen, or the like production of ozone or hydrogen C01B, C25B1/02
• CPC Class Codes: A61K 2300/00 Mixtures or combinations of active ingredients, wherein at least one active ingredient is fully defined in groups A61K31/00 - A61K41/00
• CPC Class Codes: A61K 33/00 Medicinal preparations containing inorganic active ingredients
• CPC Class Codes: A61L 15/18 containing inorganic materials
• CPC Class Codes: A61L 15/44 Medicaments
• CPC Class Codes: A61L 2/0094 Gaseous substances
• CPC Class Codes: A61L 2300/114 Nitric oxide, i.e. NO
• CPC Class Codes: A61L 2300/602 Type of release, e.g. controlled, sustained, slow
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/916 specially adapted for deep wounds
• CPC Class Codes: A61M 1/917 specially adapted for covering whole body parts
• CPC Class Codes: A61M 1/94 with gas supply means
• CPC Class Codes: A61M 13/003 Blowing gases other than for carrying powders, e.g. for inflating, dilating or rinsing
• CPC Class Codes: A61M 13/006 with gas recirculation
• CPC Class Codes: A61M 2202/0275 Nitric oxide [NO]
• CPC Class Codes: A61M 2205/3334 Measuring or controlling the flow rate
• CPC Class Codes: A61M 35/30 Gas therapy for therapeutic treatment of the skin
• CPC Class Codes: A61P 17/02 for treating wounds, ulcers, burns, scars, keloids, or the like
• CPC Class Codes: A61P 31/00 Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
• CPC Class Codes: A61P 31/02 : Local antiseptics

Abstract

Topical exposure of nitric oxide gas to wounds such as chronic non-healing wounds may be beneficial in promoting healing of the wound and in preparing the wound bed for further treatment and recovery. Nitric oxide gas may be used, for example, to reduce the microbial infection and burden on these wounds, manage exudate secretion by reducing inflammation, upregulate expression of endogenous collagenase to locally debride the wound, and regulate the formation of collagen. High concentration of nitric oxide ranging from about 160 to 400 ppm may be used without inducing toxicity in the healthy cells around a wound site. Additionally, exposure to the high concentration for a first treatment period reduces the microbial burden and inflammation at the wound site and increase collagenase expression to debride necrotic tissue at the wound site. After a first treatment period with high concentration of nitric oxide, a second treatment period at a lower concentration of nitric oxide preferably ranging from about 5-20 ppm may to provided to restore the balance of nitric oxide and induce collagen expression to aid in the closure of the wound.

Claims

1. A method for wound bed preparation, the method comprising the steps of:

diagnosing a wound site of a subject,

providing a flow-controlled source of nitric oxide containing gas,

debriding necrotic tissue located at the wound site by exposing the wound site, for a treatment period, to a high concentration of exogenous nitric oxide gas from the flow-controlled source of nitric oxide containing gas; and

exposing the wound to a low concentration of exogenous nitric oxide gas for a second treatment period sufficient to induce the expression of new collagen.

2. The method of claim 1, further comprising grafting skin onto the wound site.

3. The method of claim 1, wherein during the debriding step, the endogenous expression of collagenase is induced in situ at the wound site.

4. The method of claim 1, wherein the wound site is exposed to the high concentration of exogenous nitric oxide gas for a period of at least 7 hours.

5. The method of claim 1, wherein the wound site is exposed to the high concentration of exogenous nitric oxide gas for a period of at least 48 hours.

6. The method of claim 1, wherein the high concentration of exogenous nitric oxide gas is about 200 ppm.

7. The method of claim 1, wherein the high concentration of exogenous nitric oxide gas is from about 120 ppm to about 400 ppm.

8. The method of claim 1, wherein the low concentration of exogenous nitric oxide gas is from about 5 ppm to about 20 ppm.

9. The method of claim 1, wherein the wound site is exposed to the low concentration of exogenous nitric oxide gas for a period of at least 7 hours.