Sustained release bactericidal cannula
First Claim
1. A sustained release bactericidal cannula, through which aqueous biological fluids can pass for residence within a portion of a human body said bactericidal cannula comprising:
- a tube having an inner surface, defining an internal lumen, and an outer surface, said tube having a polymeric matrix and an antibacterial agent residing within at least a portion of the polymeric matrix;
wherein the polymeric matrix includes cured silicone rubber, said antibacterial agent is a finely divided nitrofuran compound which is soluble in water and effective to prevent proliferation of certain bacteria in an otherwise, growth supporting, aqueous environment when dissolved in the aqueous environment to the limit of its solubility therein at 37°
C., the solubility of the nitrofuran compound is about 0.2% by weight or less in water at a pH of about 6 and a temperature of about 25°
C., and the antibacterial agent can diffuse out of the polymeric matrix and into an aqueous biological environment when the polymeric matrix comes into contact with the aqueous biological environment; and
wherein at least a finite portion of the polymeric matrix proximate the outer surface includes an amount of from about 10 to about 60% by weight of the nitrofuran compound, and the amount of the nitrofuran compound in the finite portion of the polymeric matrix, and the solubility of the nitrofuran compound, cooperate to provide a potential for a sustained release diffusion of the antibacterial agent into the aqueous biological fluids within the human body, during normal therapeutic use of the cannula within the human body, so long as the aqueous biological fluids are not saturated with the antibacterial agent, such that the antibacterial agent within the finite portion of the polymeric matrix can continue to diffuse into the aqueous biological fluids within the human body in an amount effective to prevent proliferation of certain bacteria immediately adjacent to the cannula in aqueous biological environments for a period of not less than about three weeks.
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Accused Products
Abstract
A sustained release bactericidal cannula or catheter for residence within a portion of a human body through which aqueous biological fluids can pass. The bactericidal cannula for catheter including a tube having an inner surface, defining and interior lumen, and an outer surface. The tube has a polymeric matrix and antibacterial agent residing within at least a portion of the polymeric matrix. The polymeric matrix includes cured silicon rubber and the antibacterial agent is a finely divided nitrofuran compound which is soluble in water and effective to prevent proliferation of certain bacteria in an otherwise growth supporting aqueous environment when dissolved in the aqueous environment to the limit of its solubility therein at 37° C. The solubility of the nitrofuran compound is preferably about 0.2% by weight or less at a pH of about 6 and a temperature of about 25° C. The antibacterial agent can diffuse out of the polymeric matrix and into an aqueous biological environment when the polymeric matrix comes into contact with such an aqueous biological environment. Preferably, at least a finite portion of the polymeric matrix proximate the outer surface includes an amount of from about 10 to about 60% by weight of the nitrofuran compound and the amount of the nitrofuran compound and the solubility thereof cooperate to provide a potential for a sustained release diffusion thereof for a period of not less than about three weeks during normal use of the cannula within the human body. Methods of making a sustained release bactericidal cannula and of catheterizing a patient are also disclosed.
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Citations
47 Claims
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1. A sustained release bactericidal cannula, through which aqueous biological fluids can pass for residence within a portion of a human body said bactericidal cannula comprising:
- a tube having an inner surface, defining an internal lumen, and an outer surface, said tube having a polymeric matrix and an antibacterial agent residing within at least a portion of the polymeric matrix;
wherein the polymeric matrix includes cured silicone rubber, said antibacterial agent is a finely divided nitrofuran compound which is soluble in water and effective to prevent proliferation of certain bacteria in an otherwise, growth supporting, aqueous environment when dissolved in the aqueous environment to the limit of its solubility therein at 37°
C., the solubility of the nitrofuran compound is about 0.2% by weight or less in water at a pH of about 6 and a temperature of about 25°
C., and the antibacterial agent can diffuse out of the polymeric matrix and into an aqueous biological environment when the polymeric matrix comes into contact with the aqueous biological environment; and
wherein at least a finite portion of the polymeric matrix proximate the outer surface includes an amount of from about 10 to about 60% by weight of the nitrofuran compound, and the amount of the nitrofuran compound in the finite portion of the polymeric matrix, and the solubility of the nitrofuran compound, cooperate to provide a potential for a sustained release diffusion of the antibacterial agent into the aqueous biological fluids within the human body, during normal therapeutic use of the cannula within the human body, so long as the aqueous biological fluids are not saturated with the antibacterial agent, such that the antibacterial agent within the finite portion of the polymeric matrix can continue to diffuse into the aqueous biological fluids within the human body in an amount effective to prevent proliferation of certain bacteria immediately adjacent to the cannula in aqueous biological environments for a period of not less than about three weeks. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- a tube having an inner surface, defining an internal lumen, and an outer surface, said tube having a polymeric matrix and an antibacterial agent residing within at least a portion of the polymeric matrix;
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8. A sustained release bactericidal urinary catheter for residence within a urinary tract of a human body, said bactericidal urinary catheter comprising:
- a tube having an inner surface, defining an internal lumen, and an outer surface, said tube having a polymeric matrix and an antibacterial agent residing within the polymeric matrix, wherein the polymeric matrix includes silicone rubber, the antibacterial agent is a nitrofuran compound which is soluble in water and effective to reduce proliferation of bacteria in an otherwise growth supporting, aqueous environment when dissolved in the aqueous environment to the limit of its solubility therein at 37°
C., and the antibacterial agent can diffuse out of the polymeric matrix and into an aqueous biological environment when the polymeric matrix comes into contact with the aqueous biological environment; and
wherein the antibacterial agent has a solubility in water, at a pH of about 6 and a temperature of about 25°
C., of about 0.2% by weight or less, and at least a finite portion of the polymeric matrix proximate the outer surface contains an amount of from about 10 to about 60% by weight of the nitrofuran compound, and the amount of the nitrofuran compound in the finite portion of the polymeric matrix and the solubility of the nitrofuran compound cooperate to provide a potential for a sustained release diffusion of the antibacterial agent into the aqueous biological fluids within the human body during normal therapeutic use of the catheter within the urinary tract so long as the aqueous biological fluids are not saturated with the antibacterial agent, such that the antibacterial agent within the finite portion of the polymeric matrix can continue to diffuse into the aqueous biological fluids within the urinary tract in an amount effective to prevent proliferation of certain bacteria immediately adjacent to the catheter in aqueous biological environments for a period of not less than about three weeks. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- a tube having an inner surface, defining an internal lumen, and an outer surface, said tube having a polymeric matrix and an antibacterial agent residing within the polymeric matrix, wherein the polymeric matrix includes silicone rubber, the antibacterial agent is a nitrofuran compound which is soluble in water and effective to reduce proliferation of bacteria in an otherwise growth supporting, aqueous environment when dissolved in the aqueous environment to the limit of its solubility therein at 37°
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19. A sustained release bactericidal urinary catheter for residence within a urinary tract of a human body, the sustained release bactericidal urinary catheter comprising:
- an interior surface defining a first lumen, an expandable balloon having an expandable balloon cavity, a second lumen in communication with the expandable balloon cavity, and an exterior surface, wherein the exterior surface is coated to form a coating having a silicone rubber polymeric matrix containing an antibacterial agent capable of diffusing out of the polymeric matrix in aqueous environments, the antibacterial agent is a finely divided nitrofuran compound which is soluble in water, the solubility of the nitrofuran compound is about 0.2% by weight or less in water at a pH of about 6 and a temperature of about 25°
C., and the amount of the nitrofuran compound in the silicone rubber polymeric matrix is an amount in a range from about 10 to about 60% by weight of the coating, and wherein the amount of the nitrofuran compound in the coating and the solubility of the nitrofuran compound cooperate to provide a potential for a sustained release diffusion of the antibacterial agent into the aqueous biological fluids within the human body during normal therapeutic use of the catheter within the urinary tract, so long as the aqueous biological fluids are not saturated with the antibacterial agent, such that the antibacterial agent within the coating can continue to diffuse into the aqueous biological fluids within the urinary tract in an amount effective to prevent proliferation of certain bacteria immediately adjacent to the catheter in aqueous biological environments for a period of not less than about three weeks. - View Dependent Claims (20, 21, 22)
- an interior surface defining a first lumen, an expandable balloon having an expandable balloon cavity, a second lumen in communication with the expandable balloon cavity, and an exterior surface, wherein the exterior surface is coated to form a coating having a silicone rubber polymeric matrix containing an antibacterial agent capable of diffusing out of the polymeric matrix in aqueous environments, the antibacterial agent is a finely divided nitrofuran compound which is soluble in water, the solubility of the nitrofuran compound is about 0.2% by weight or less in water at a pH of about 6 and a temperature of about 25°
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23. An elongated sustained release bactericidal cannula comprising an interior surface, defining a first lumen, an exterior surface and an enclosed sleeve cavity located between the respective interior and exterior surfaces and encircling the first lumen, said elongated bactericidal cannula further comprising a resilient sleeve portion encircling the first lumen and said sleeve cavity, said sleeve cavity containing a lubricating substance, wherein the bactericidal cannula further includes a silicone rubber coating containing an amount of an antibacterial agent effective to diffuse out of the silicone rubber coating when immersed in an aqueous environment, the silicone rubber is a cured silicone rubber matrix containing silicone fluid, the antibacterial agent is a finely divided nitrofuran compound which is soluble in water and has antibacterial activity in aqueous biological environments when dissolved in such an aqueous biological environment to the limit of its solubility in water at 37°
- C., the solubility of the nitrofuran compound is about 0.001 to 0.2% by weight in water at a pH of about 6 and a temperature of about 25°
C., and the amount of the nitrofuran compound in the silicone rubber coating is an amount in a range of from about 10 to about 60% by weight of the coating. - View Dependent Claims (24)
- C., the solubility of the nitrofuran compound is about 0.001 to 0.2% by weight in water at a pH of about 6 and a temperature of about 25°
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25. A method of catheterizing a patient, the patient having a urinary tract through which aqueous fluids can pass, said method comprising the steps of:
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(a) providing a sustained release bactericidal urinary catheter including an interior surface defining a first lumen and an exterior surface, wherein the exterior surface is coated with a cured silicone rubber polymeric matrix forming a coating containing an antibacterial agent capable of diffusing out of the cured silicone rubber polymeric matrix in aqueous environments, wherein the antibacterial agent is a nitrofuran compound which soluble having a solubility of about 0.2% by weight or less in water at a pH of about 6 and a temperature of about 25°
C., and the amount of the nitrofuran compound in the cured polymeric matrix is in a range of from about 10-60% by weight of the total weight of the cured silicone rubber polymeric matrix, and wherein the amount of the nitrofuran compound in the coating and the solubility of the nitrofuran compound cooperate to provide a potential for a sustained release diffusion of the antibacterial agent into the aqueous biological fluids within the human body during normal therapeutic use of the catheter within the urinary tract so long as the aqueous biological fluids are not saturated with the antibacterial agent, such that the antibacterial agent within the coating can continue to diffuse into the aqueous biological fluids within the urinary tract in an amount effective to prevent proliferation of certain bacteria immediately adjacent to the catheter in aqueous biological environments for a period of not less than about three weeks;(b) placing the catheter within the urinary tract for residence therein, wherein the aqueous fluids within the urinary tract interact with the cured silicone polymeric matrix, and a sufficient amount of the antibacterial agent is provided such that the antibacterial agent can diffuse into the aqueous fluids for a period of at least about three weeks such that the aqueous fluids are less capable of sustaining bacterial growth therein during this period as a result of the presence of the antibacterial agent. - View Dependent Claims (26, 27)
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28. A sustained release bactericidal cannula through which aqueous biological fluids can pass, said bactericidal cannula comprising:
a tube having a surface, the surface being coated at least in part by a polymeric material, the polymeric material providing a polymeric matrix, the polymeric matrix containing an antibacterial agent which is at least partially soluble in water, wherein the antibacterial agent can diffuse out of the polymeric matrix and into an aqueous biological environment when the polymeric matrix comes into contact with such an aqueous biological environment, wherein said antibacterial agent is a nitrofuran compound which is at least partially soluble in water and effective to prevent proliferation of certain bacteria in an otherwise, growth supporting, aqueous environment when dissolved in the aqueous environment to the limit of its solubility therein at 37°
C.- View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A sustained release bactericidal cannula through which aqueous biological fluids can pass, said bactericidal cannula being made from a tube having an uncured silicone rubber outer surface, said bactericidal cannula being made by a process comprising the steps of:
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(a) providing an antibacterial agent containing mixture including uncured silicone rubber and finely divided particles of a solid antibacterial agent, wherein the antibacterial agent is a nitrofuran compound having a solubility in water of 0.2% by weight or less; (b) coating at least a portion of the outer surface of the tube with the antibacterial agent containing mixture to form an uncured nitrofuran containing silicone rubber outer layer; and (c) curing the silicone rubber of both the uncured silicone rubber outer surface and the uncured nitrofuran containing silicone rubber outer layer to form a cured antibacterial agent containing silicone rubber outer layer bonded to the silicone rubber outer surface;
wherein the step of providing includes providing an antibacterial agent containing mixture containing a sufficient amount of the nitrofuran compound that the cured antibacterial agent containing silicone rubber outer layer contains about 10 to about 60 percent by weight of the nitrofuran compound;
wherein the outer surface of the resulting bactericidal cannula is coated at least in part by a polymeric material including silicone rubber, the polymeric material providing a polymeric matrix, the polymeric matrix containing the antibacterial agent, wherein the antibacterial agent can diffuse out of the polymeric matrix and into an aqueous biological environment when the polymeric matrix comes into contact with such an aqueous biological environment, wherein said antibacterial agent is a nitrofuran compound which is at least partially soluble in water and effective to prevent proliferation of certain bacteria in an otherwise, growth supporting, aqueous environment when dissolved in the aqueous environment to the limit of its solubility therein at 37°
C. - View Dependent Claims (45, 46, 47)
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Specification