Patents by Inventor Lester A. Sampath

Lester A. Sampath has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20150087716
    Abstract: The present disclosure invention relates to medical devices treated with a solution comprising one or more solvents and a combination of chlorhexidine free base and a water-soluble chlorhexidine salt in a weight/weight ratio of between about 1:1 to about 1:5, preferably about 1:1.
    Type: Application
    Filed: December 1, 2014
    Publication date: March 26, 2015
    Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK
    Inventors: Shanta M. Modak, Lester A. Sampath
  • Patent number: 8906401
    Abstract: The present disclosure invention relates to medical devices treated with a solution comprising one or more solvents and a combination of chlorhexidine free base and a water-soluble chlorhexidine salt in a weight/weight ratio of between about 1:1 to about 1:5, preferably about 1:1.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: December 9, 2014
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Shanta M. Modak, Lester A. Sampath
  • Patent number: 8436050
    Abstract: Antimicrobial compositions having synergistic combinations of octoxyglycerin and at least one other antimicrobial agent in formulations which are more effective than prior art compositions without causing increased irritation to the skin of the average user. In certain embodiments, skin irritation may be minimized by low concentrations of antimicrobials and/or the presence of soothing compounds such as zinc. Preferred embodiments include combinations of octoxyglycerin, a quaternary compound, and at least one other antimicrobial agent. Without being bound to any particular theory, it is hypothesized that the unexpected antimicrobial effectiveness of combinations of octoxyglycerin may result from an enhancement of the permeability of microbes to antimicrobials caused by octoxyglycerin. Hydroalcoholic gel composition containing alcohol, water, hydrogel, and emollient or emulsifier, wherein the composition has a viscosity of below 2000 centipoises at between 20 and 40° C.
    Type: Grant
    Filed: February 24, 2004
    Date of Patent: May 7, 2013
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Shanta Modak, Trupti A. Gaonkar, Lauser Caraos, Lester Sampath
  • Patent number: 8383143
    Abstract: The present disclosure invention relates to medical devices treated with a solution comprising one or more solvents and a combination of chlorhexidine free base and a water-soluble chlorhexidine salt in a weight/weight ratio of between about 1:1 to about 1:5, preferably about 1:1.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: February 26, 2013
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Shanta M. Modak, Lester A. Sampath
  • Patent number: 8293802
    Abstract: Antimicrobial compositions having synergistic combinations of octoxyglycerin and at least one other antimicrobial agent in formulations which are more effective than prior art compositions without causing increased irritation to the skin of the average user. In certain embodiments, skin irritation may be minimized by low concentrations of antimicrobials and/or the presence of soothing compounds such as zinc. Preferred embodiments include combinations of octoxyglycerin, a quaternary compound, and at least one other antimicrobial agent. Without being bound to any particular theory, it is hypothesized that the unexpected antimicrobial effectiveness of combinations of octoxyglycerin may result from an enhancement of the permeability of microbes to antimicrobials caused by octoxyglycerin. Hydroalcoholic gel composition containing alcohol, water, hydrogel, and emollient or emulsifier, wherein the composition has a viscosity of below 2000 centipoises at between 20 and 40° C.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: October 23, 2012
    Assignee: The Trustees of Columbia University
    Inventors: Shanta Modak, Trupti A. Gaonkar, Lauserpina Algenio Caraos, Lester Sampath
  • Publication number: 20100305211
    Abstract: Antimicrobial compositions having synergistic combinations of octoxyglycerin and at least one other antimicrobial agent in formulations which are more effective than prior art compositions without causing increased irritation to the skin of the average user. In certain embodiments, skin irritation may be minimized by low concentrations of antimicrobials and/or the presence of soothing compounds such as zinc. Preferred embodiments include combinations of octoxyglycerin, a quaternary compound, and at least one other antimicrobial agent. Without being bound to any particular theory, it is hypothesized that the unexpected antimicrobial effectiveness of combinations of octoxyglycerin may result from an enhancement of the permeability of microbes to antimicrobials caused by octoxyglycerin. Hydroalcoholic gel composition containing alcohol, water, hydrogel, and emollient or emulsifier, wherein the composition has a viscosity of below 2000 centipoises at between 20 and 40° C.
    Type: Application
    Filed: August 10, 2010
    Publication date: December 2, 2010
    Inventors: Shanta Modak, Trupti A. Gaonkar, Lauser Caraos, Lester Sampath
  • Patent number: 7537779
    Abstract: The present invention provides for antimicrobial medical articles prepared by a method comprising treating a surface of the medical article with a solution consisting essentially of one or more solvents and a mixture of chlorhexidine free base and a water-soluble chlorhexidine salt, at a weight/weight ratio of between about 1:1 to about 1:5, wherein the combined concentration of chlorhexidine free base and a water-soluble salt of chlorhexidine is about 2% (w/v) or greater. In alternative embodiments, the antimicrobial medical articles may be treated with a similar solution in which the concentrations of chlorhexidine free base and a water-soluble salt of chlorhexidine are each about 0.20 percent (w/v). Other embodiments include those in which the solvent comprises methanol, or the treatment solution further comprises a silver salt, one or more organic acids, an anti-inflammatory agent, and a hydrogel.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: May 26, 2009
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Shanta M. Modak, Lester A. Sampath
  • Publication number: 20080075761
    Abstract: The present disclosure invention relates to medical devices treated with a solution comprising one or more solvents and a combination of chlorhexidine free base and a water-soluble chlorhexidine salt in a weight/weight ratio of between about 1:1 to about 1:5, preferably about 1:1.
    Type: Application
    Filed: November 28, 2007
    Publication date: March 27, 2008
    Inventors: Shanta Modak, Lester Sampath
  • Patent number: 7329412
    Abstract: The present disclosure invention relates to medical devices treated with a solution comprising one or more solvents and a combination of chlorhexidine free base and a water-soluble chlorhexidine salt in a weight/weight ratio of between about 1:1 to about 1:5, preferably about 1:1.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: February 12, 2008
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Shanta M. Modak, Lester A. Sampath
  • Publication number: 20050192547
    Abstract: The present invention relates to compositions comprising a combination of one or more antiseptic and an antibiotic. It is based, at least in part, on the discovery that such combinations tend to deter the formation of antibiotic-resistant organisms. In preferred, nonlimiting embodiments of the invention, the antibiotic is minocycline and the antiseptic is a chlorhexidine compound, triclosan, or benzalkonium chloride, and in particular embodiments, a silver salt or a bismuth salt is added. Examples of specific, nonlimiting embodiments of the invention include combinations of (i) minocycline, triclosan, and a bismuth salt; (ii) minocycline, a chlorhexidine compound, and a bismuth salt; and (iii) minocycline, benzalkonium chloride, and a bismuth salt. The present invention further provides for articles, such as, but not limited to, medical articles, which have been treated with or which otherwise comprise a combination of antiseptic and antibiotic.
    Type: Application
    Filed: July 30, 2003
    Publication date: September 1, 2005
    Inventors: Shanta Modak, Suhas Tambe, Lester Sampath
  • Publication number: 20050124725
    Abstract: The present invention relates to polymeric medical articles comprising combinations of triclosan and silver-containing compounds. It is based, at least in part, on the discovery that these agents act synergistically, thereby permitting the use of relatively low levels of both agents. While it had been previously found that triclosan can be particularly useful when used in conjunction with chlorhexidine, it has been further discovered that medical articles having suitable antimicrobial properties may be prepared, according to the present invention, which contain triclosan without chlorhexidine. Such medical articles offer the advantage of preventing or inhibiting infection while avoiding undesirable adverse reactions to chlorhexidine by individuals that may have sensitivity to chlorhexidine.
    Type: Application
    Filed: January 6, 2005
    Publication date: June 9, 2005
    Inventors: Shanta Modak, Lester Sampath
  • Patent number: 6872195
    Abstract: The present invention relates to polymeric medical articles comprising the anti-infective agents chlorhexidine and triclosan. It is based, at least in part, on the discovery that the synergistic relationship between these compounds permits the use of relatively low levels of both agents, and on the discovery that effective antimicrobial activity may be achieved when these compounds are comprised in either hydrophilic or hydrophobic polymers. It is also based on the discovery that chlorhexidine free base and triclosan, used together, are incorporated into polymeric medical articles more efficiently. Medical articles prepared according to the invention offer the advantage of preventing or inhibiting infection while avoiding undesirably high release of anti-infective agent, for example into the bloodstream of a subject.
    Type: Grant
    Filed: August 25, 2003
    Date of Patent: March 29, 2005
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Shanta Modak, Lester Sampath
  • Patent number: 6846846
    Abstract: Antimicrobial compositions having synergistic combinations of octoxyglycerin and at least one other antimicrobial agent in formulations which are more effective than prior art compositions without causing increased irritation to the skin of the average user. In certain embodiments, skin irritation may be minimized by low concentrations of antimicrobials and/or the presence of soothing compounds such as zinc. Preferred embodiments include combinations of octoxyglycerin, a quaternary compound, and at least one other antimicrobial agent. Without being bound to any particular theory, it is hypothesized that the unexpected antimicrobial effectiveness of combinations of octoxyglycerin may result from an enhancement of the permeability of microbes to antimicrobials caused by octoxyglycerin.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: January 25, 2005
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Shanta Modak, Trupti A. Gaonkar, Lester Sampath
  • Patent number: 6843784
    Abstract: The present invention relates to polymeric medical articles comprising combinations of triclosan and silver-containing compounds. It is based, at least in part, on the discovery that these agents act synergistically, thereby permitting the use of relatively low levels of both agents. While it had been previously found that triclosan can be particularly useful when used in conjunction with chlorhexidine, it has been further discovered that medical articles having suitable antimicrobial properties may be prepared, according to the present invention, which contain triclosan without chlorhexidine. Such medical articles offer the advantage of preventing or inhibiting infection while avoiding undesirable adverse reactions to chlorhexidine by individuals that may have sensitivity to chlorhexidine.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: January 18, 2005
    Assignee: The Trustees Of Columbia University in the city of New York
    Inventors: Shanta Modak, Lester Sampath
  • Publication number: 20040247685
    Abstract: Antimicrobial compositions having synergistic combinations of octoxyglycerin and at least one other antimicrobial agent in formulations which are more effective than prior art compositions without causing increased irritation to the skin of the average user. In certain embodiments, skin irritation may be minimized by low concentrations of antimicrobials and/or the presence of soothing compounds such as zinc. Preferred embodiments include combinations of octoxyglycerin, a quaternary compound, and at least one other antimicrobial agent. Without being bound to any particular theory, it is hypothesized that the unexpected antimicrobial effectiveness of combinations of octoxyglycerin may result from an enhancement of the permeability of microbes to antimicrobials caused by octoxyglycerin. Hydroalcoholic gel composition containing alcohol, water, hydrogel, and emollient or emulsifier, wherein the composition has a viscosity of below 2000 centipoises at between 20 and 40° C.
    Type: Application
    Filed: February 24, 2004
    Publication date: December 9, 2004
    Inventors: Shanta Modak, Trupti A. Gaonkar, Lauser Caraos, Lester Sampath
  • Publication number: 20040052831
    Abstract: The present invention provides for antimicrobial medical articles prepared by a method comprising treating a surface of the medical article with a solution consisting essentially of one or more solvents and a mixture of chlorhexidine free base and a water-soluble chlorhexidine salt, at a weight/weight ratio of between about 1:1 to about 1:5, wherein the combined concentration of chlorhexidine free base and a water-soluble salt of chlorhexidine is about 2% (w/v) or greater. In alternative embodiments, the antimicrobial medical articles may be treated with a similar solution in which the concentrations of chlorhexidine free base and a water-soluble salt of chlorhexidine are each about 0.20 percent (w/v). Other embodiments include those in which the solvent comprises methanol, or the treatment solution further comprises a silver salt, one or more organic acids, an anti-inflammatory agent, and a hydrogel.
    Type: Application
    Filed: June 20, 2003
    Publication date: March 18, 2004
    Inventors: Shanta M. Modak, Lester A. Sampath
  • Patent number: 6706024
    Abstract: The present invention relates to polymeric medical articles comprising the anti-infective agents chlorhexidine and triclosan. It is based, at least in part, on the discovery that the synergistic relationship between these compounds permits the use of relatively low levels of both agents, and on the discovery that effective antimicrobial activity may be achieved when these compounds are comprised in either hydrophilic or hydrophobic polymers. It is also based on the discovery that chlorhexidine free base and triclosan, used together, are incorporated into polymeric medical articles more efficiently. Medical articles prepared according to the invention offer the advantage of preventing or inhibiting infection while avoiding undesirably high release of anti-infective agent, for example into the bloodstream of a subject.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: March 16, 2004
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Shanta M. Modak, Lester A. Sampath
  • Publication number: 20040039349
    Abstract: The present invention relates to polymeric medical articles comprising the anti-infective agents chlorhexidine and triclosan. It is based, at least in part, on the discovery that the synergistic relationship between these compounds permits the use of relatively low levels of both agents, and on the discovery that effective antimicrobial activity may be achieved when these compounds are comprised in either hydrophilic or hydrophobic polymers. It is also based on the discovery that chlorhexidine free base and triclosan, used together, are incorporated into polymeric medical articles more efficiently. Medical articles prepared according to the invention offer the advantage of preventing or inhibiting infection while avoiding undesirably high release of anti-infective agent, for example into the bloodstream of a subject.
    Type: Application
    Filed: August 25, 2003
    Publication date: February 26, 2004
    Inventors: Shanta Modak, Lester Sampath
  • Patent number: 6626873
    Abstract: The present invention relates to polymeric medical articles comprising the anti-infective agents chlorhexidine and triclosan. It is based, at least in part, on the discovery that the synergistic relationship between these compounds permits the use of relatively low levels of both agents, and on the discovery that effective antimicrobial activity may be achieved when these compounds are comprised in either hydrophilic or hydrophobic polymers. It is also based on the discovery that chlorhexidine free base and triclosan, used together, are incorporated into polymeric medical articles more efficiently. Medical articles prepared according to the invention offer the advantage of preventing or inhibiting infection while avoiding undesirably high release of anti-infective agent, for example into the bloodstream of a subject.
    Type: Grant
    Filed: July 18, 2000
    Date of Patent: September 30, 2003
    Assignee: Trustees of Columbia University
    Inventors: Shanta Modak, Lester Sampath
  • Publication number: 20030152644
    Abstract: Antimicrobial compositions having synergistic combinations of octoxyglycerin and at least one other antimicrobial agent in formulations which are more effective than prior art compositions without causing increased irritation to the skin of the average user. In certain embodiments, skin irritation may be minimized by low concentrations of antimicrobials and/or the presence of soothing compounds such as zinc. Preferred embodiments include combinations of octoxyglycerin, a quaternary compound, and at least one other antimicrobial agent. Without being bound to any particular theory, it is hypothesized that the unexpected antimicrobial effectiveness of combinations of octoxyglycerin may result from an enhancement of the permeability of microbes to antimicrobials caused by octoxyglycerin.
    Type: Application
    Filed: October 23, 2001
    Publication date: August 14, 2003
    Inventors: Shanta Modak, Trupti A. Gaonkar, Lester Sampath