System and method for site specific therapy
First Claim
1. A system for performing site specific therapy of a tissue site, the system comprising one or more catheters, each comprising one or more semipermeable membranes in the form of hollow fibers adapted to be positioned within the tissue site, and a delivery/recovery mechanism for employing the catheter(s) to control the movement of bulk fluids within tissue portions in a manner that achieves a therapeutic effect, wherein the delivery/recovery mechanism comprises a source of negative hydrostatic pressure adapted to recover bulk fluids and/or water and permeant solutes through the semipermeable membranes and from the tissue site, and wherein the hollow fibers each provide a combination of strength, transport rate, and porosity suitable to provide improved fiber fluid recovery as compared to a conventional hollow fiber formed of regenerated cellulose membranes when evaluated in a test system comprising the fibers submerged in a physiologic fluid solution and subjected to negative 180 mm Hg.
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Accused Products
Abstract
A system, including catheter apparatus, and related method for performing site specific therapy. The catheter apparatus can include one or more semipermeable microcatheters (preferably in the form of hollow fibers) for use in performing site specific microdialysis. The system and method are particularly suited for use in addressing cerebral edema by affecting the osmolar relationship between fluids making up the brain tissue. Also disclosed is an apparatus having a delivery/recovery mechanism in the form of a pump reservoir and one or more catheters in the form of semipermeable microcatheters, for use in delivering and/or recovering fluid to and/or from a tissue site or for performing tissue engineering outside of the body. The apparatus can be used in a method to perform site specific microtherapy, including for the treatment of compartment syndrome or cerebral edema.
186 Citations
51 Claims
- 1. A system for performing site specific therapy of a tissue site, the system comprising one or more catheters, each comprising one or more semipermeable membranes in the form of hollow fibers adapted to be positioned within the tissue site, and a delivery/recovery mechanism for employing the catheter(s) to control the movement of bulk fluids within tissue portions in a manner that achieves a therapeutic effect, wherein the delivery/recovery mechanism comprises a source of negative hydrostatic pressure adapted to recover bulk fluids and/or water and permeant solutes through the semipermeable membranes and from the tissue site, and wherein the hollow fibers each provide a combination of strength, transport rate, and porosity suitable to provide improved fiber fluid recovery as compared to a conventional hollow fiber formed of regenerated cellulose membranes when evaluated in a test system comprising the fibers submerged in a physiologic fluid solution and subjected to negative 180 mm Hg.
- 15. A method for performing site specific therapy of a tissue site, the method comprising the steps of a) providing a system comprising one or more catheters, each comprising one or more semipermeable membranes in the form of hollow fibers, and each adapted to be positioned within the tissue sites and a delivery/recovery mechanism for employing the catheter(s) to control the movement of bulk fluids and/or active fluid components, within tissue portions, b) positioning the catheter(s) within the tissue site, and c) operating the mechanism in order to control the movement of bulk fluids and/or active fluid components, wherein the delivery/recovery mechanism comprises a source of negative hydrostatic pressure adapted to recover bulk fluids and/or water and permeant solutes through the semipermeable membranes and from the tissue site, wherein the hollow fibers each provide a combination of strength, transport rate, and porosity suitable to provide improved fiber fluid recovery as compared to a conventional hollow fiber formed of regenerated cellulose membrane when evaluated in a test system comprising the fibers submerged in a physiologic fluid solution and subjected to negative 180 mm Hg.
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26. A method for performing site specific therapy of a tissue site, the method comprising the steps of:
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a) providing a system comprising one or more catheters, each comprising one or more semipermeable membranes in the form of hollow fibers, and each adapted to be positioned within the tissue site and a delivery/recovery mechanism for employing the catheter(s) to control the movement of bulk fluids and/or water and permeant solutes within tissue site, wherein the system is adapted for use in the therapy of compartment syndrome or cerebral edema, b) positioning the catheter(s) within the tissue site exhibiting compartment syndrome or cerebral edema, and c) operating the mechanism in order to control the movement of bulk fluids and/or water and permeant solutes, wherein the delivery/recovery mechanism comprises a source of negative hydrostatic pressure adapted to recover bulk fluids and/or water and permeant solutes from within the tissue site. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method for performing site specific therapy in order to treat cerebral edema, the method comprising the steps of:
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a) providing a system comprising one or more catheters, in the form of a plurality of semipermeable membranes adapted to be positioned within the brain parenchyma and a delivery/recovery mechanism for employing the hollow fibers to control the movement of bulk fluids and/or water and permeant solutes within the parenchyma, b) positioning the hollow fibers within the parenchyma, and c) operating the mechanism by applying a source of negative hydrostatic pressure to recover bulk fluids and/or water and permeant solutes through the hollow fibers and from within the tissue site in a manner that achieves a therapeutic effect. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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Specification