University System of Maryland

The General Hospital Corporation

Gel-e, Inc.

Wichita State University

Matthew Dowling

Srinivasa R Raghavan

David R King

Gregory F Payne

Kevin K Diehn

John R Hess

Grant Bochicchio

Philip R DeShong

Douglas Stephen English

Chao Zhu

Neeraja Dashaputre

Vishal Javvaji

Rakesh Kumar

A sprayable polymeric foam hemostat for both compressible and non-compressible (intracavitary) acute wounds is disclosed. The foam comprises hydrophobically-modified polymers, such as hm-chitosan, or other amphiphilic polymers that anchor themselves within the membrane of cells in the vicinity of the wound. By rapidly expanding upon being released from a canister pressurized with liquefied gas propellant, the foam is able to enter injured body cavities and staunch bleeding. The seal created is strong enough to substantially prevent the loss of blood from these cavities. Hydrophobically-modified polymers inherently prevent microbial infections and are suitable for oxygen transfer required during normal wound metabolism. The amphiphilic polymers form solid gel networks with blood cells to create a physical clotting mechanism that prevent loss of blood.

Advanced functional biocompatible foam used as a hemostatic agent for non-compressible acute wounds

A hemostatic putty for treatment of a variety of wounds topographies, including but not limited to highly three dimensional wounds, for example gunshot wounds and impalements, is disclosed. The putty is comprised of a matrix polymer weakly crosslinked or not crosslinked such that a viscoelastic matrix is formed. The viscoelastic nature of the putty is tunable by the composition and enables the putty to conform to a variety of wound topographies. Likewise, a hemostatic polymer, for example chitosan or hydrophobically modified chitosan, is included in this matrix to impart hemostatic properties and tissue adhesive on the putty. The hemostatic polymers disclosed prevent microbial infection and are suitable for oxygen transfer required during normal wound metabolism.

Advanced functional biocompatible polymer putty used as a hemostatic agent for treating damaged tissue and cells

A hemostatic tissue sealant sponge and a spray for acute wounds are disclosed. The sponge comprises hydrophobically modified polymers that anchor themselves within the membrane of cells in the vicinity of the wound. The seal is strong enough to substantially prevent the loss of blood inside the boundaries of the sponge, yet weak enough to substantially prevent damage to newly formed tissue upon recovery and subsequent removal of the sponge. In examples, the polymers inherently prevent microbial infections and are suitable for oxygen transfer required during normal wound metabolism. The spray comprises hydrophobically modified polymers that form solid gel networks with blood cells to create a physical clotting mechanism to prevent loss of blood. In an example, the spray further comprises at least one reagent that increases the mechanical integrity of the clot. In another example, the reagent prevents microbial infection of the wound.

Advanced functional biocompatible polymeric matrix used as a hemostatic agent and system for damaged tissues and cells

The present invention provides a novel biomaterial which is a hybrid, self-assembling biopolymeric networked film that is functionalized through hydrophobic interactions with vesicles loaded with bioactive agents. The biomaterial compound is a polymeric network of hydrophobically modified chitosan scaffolds that is taken from solution and formed as a solid film. This solid state film is capable of hydrophobic interactions with the functionalized vesicles. The vesicles include one or more lamellar structures forming one or more nano-compartments that are capable of containing similar or alternative active moieties within. Use of the film results in a degradation of the chitosan scaffold thereby releasing the active moieties within the vesicles from the scaffold. Application of the current invention occurs through various delivery mechanisms and routes of administration as will be described herein.

Advanced functional biocompatible polymeric matrix containing nano-compartments

A biosensor comprising an electrically conductive substrate coated with a modified chitosan biopolymer that has been electrodeposited on the substrate, wherein said modified chitosan biopolymer comprises at least one vesicle binding molecule. The biosensor is manufactured by a method where a modified chitosan biopolymer is electrodeposited on a substrate. The method is also used to manufacture a modified chitosan biopolymer film by electrodeposition of the chitosan on the substrate and later removing the film from the substrate after electrodeposition. The resulting film can be used in bandages to treat various types of wounds. The biosensor can also be used to detect various analytes in samples.

Method and system for capture and use of intact vesicles on electrodeposited hydrophobically modified biopolymer films

Advanced functional biocompatible foam used as a hemostatic agent for compressible and non-compressible acute wounds

A method for reversing gelation of hydrophobically modified biopolymer attached to vesicle or cell membranes. The gelation of hydrophobically modified biopolymer attached to vesicles or cell membranes is reversed by application of a supramolecule, such as cyclodextrin, to the gelled composition. The supramolecule disrupts the interactions between the hydrophobically modified biopolymer and the vesicle or cell membrane, without affecting the structure of the membrane or the hydrophobically modified polymer to which the hydrophobic substituents are attached. A kit for treating wounds that includes a hydrophobically modified biopolymer and a supramolecule. The hydrophobically modified biopolymer is used to stop bleeding and the supramolecule is used to remove the hydrophobically modified biopolymer.

Method and system for reversal of interactions between hydrophobically modified biopolymers and vesicles or cell membranes

Growing community of inventors

Washington, DC, United States of America

Matthew Dowling