Abstract:
The present invention provides improved devices, methods, and kits for inhibiting restenosis and hyperplasia after intravascular intervention. In particular, the present invention provides controlled radiosensitizer delivery in combination with ionizing radiation to selected locations within a patient's vasculature to reduce and/or inhibit restenosis and hyperplasia rates with increased efficacy. In one embodiment, the combination radiation and radiosensitizer delivery catheter for inhibiting hyperplasia comprises a catheter body having a proximal end and distal end, an ionizing radiation source coupleable to the catheter body for applying a radiation dose to a body lumen, and a porous material, matrix, membrane, banier, coating, infusion lumen, stent, graft, or reservoir for releasing an radiosensitizer to the body lumen.
Abstract:
The present invention provides improved devices, methods, and kits for inhibiting restenosis and hyperplasia after intravascular intervention. In particular, the present invention provides controlled drug delivery in combination with x-ray radiation delivery to selected locations within a patient's vasculature to reduce and/or inhibit restenosis and hyperplasia rates with increased efficacy. In one embodiment, the combination radiation and agent delivery catheter for inhibiting hyperplasia comprises a catheter body having a proximal end and distal end, an x-ray tube coupleable to the catheter body for applying a radiation dose to a body lumen, and a porous material, matrix, membrane, barrier, coating, infusion lumen, stent, graft, or reservoir for releasing an agent to the body lumen.
Abstract:
Generally, the present invention provides a device for insertion into a body of a subject being treated to deliver localized x-ray radiation, and a method for fabricating such a device. The device includes a cathode structure that has a thin, diamond film as a cathode. The device further comprises a vacuum housing and an anode. A method for fabricating a device for localized x-ray radiation is described which includes the formation of a thin diamond film on a getter at temperatures below an activation temperature of the getter.
Abstract:
A process for the preparation of slippery, hydrophilic polyurethane hydrogel coating compositions, and materials composed of a polymeric plastic or rubber substrate or a metal substrate with a coating of a slippery, hydrophilic polyurethane hydrogel thereon, such that the coating composition tenaciously adheres to the substrate, are disclosed. The coating compositions and coated materials are non-toxic and biocompatible, and are ideally suited for use on medical devices, particularly, catheters, catheter balloons and stents. The coating compositions, coated materials and coated devices demonstrate low coefficients of friction in contact with body fluids, especially blood, as well as a high degree of wear permanence over prolonged use of the device. The hydrogel coating compositions are capable of being dried to facilitate storage of the devices to which they have been applied, and can be instantly reactivated for later use by exposure to water.
Abstract:
An infusion guide wire of superelastic nickel titanium is disclosed comprising a lumen extending longitudinally through the wire and a distal portion with a smaller outer diameter than a proximal portion. One or more intermediate portions of intermediate outer diameters can be provided, as well. An occlusion balloon can be attached to the distal portion, and inflated through the lumen. Alternatively, or in conjunction with the occlusion balloon, drugs or other agents can be delivered through the lumen.
Abstract:
A process for preparing coating compositions of a commingled hydrogel of a polyurethane-polyurea polymer hydrogel and a poly(N-vinylpyrrolidone) polymer hydrogel; a process for making materials composed of a polymeric plastic or rubber substrate or a metallic substrate, with a coating of the commingled hydrogel thereon; and a process for making medical devices with a coating of the commingled hydrogel thereon, are disclosed. The coating compositions tenaciously adhere to the substrate materials and medical devices to which they are applied due to bonding of a tie coat to a reactive substrate surface and due to the commingling of the two hydrogel components. The coating compositions and coated materials and medical devices are non-toxic and biocompatible, making them ideally suited for use in applications such as for catheters, catheter balloons and stents. In such applications, the coating compositions, coated materials, and coated medical devices made therefrom demonstrate low coefficients of friction in contact with body fluids, especially blood, as well as a high degree of wear permanence over prolonged use. The commingled hydrogel coatings are capable of being dried to facilitate storage of the devices to which they have been applied, and can be instantly reactivated for later use by exposure to water.
Abstract:
This invention relates to a drug delivery device having a hollow tube which is configured to serve as a guide wire for intraluminal procedures. The distal portion of the tube has at least one opening which has a diameter suitable for the infusion of a drug formulation therethrough. The tube is preferably formed from a superelastic material such as nickel-titanium alloy. This invention also relates to various methods of using this drug delivery device in thrombolytic and other intraluminal procedures.
Abstract:
Catheters for drug delivery or for both dilatation and drug delivery are provided with a guide wire lumen terminating within the catheter shaft and having an opening through the catheter shaft to enable a guide wire to exit the catheter shaft substantially distal to the proximal end of the catheter. In one embodiment, drug delivery ports are provided between occlusion balloons. In another embodiment, a dilatation balloon is also provided between the occlusion balloons. In another embodiment, a double layered balloon is provided to simultaneously dilatate the stenosis and deliver medication to the site. Alternatively, a balloon can be provided which only delivers medication.
Abstract:
A balloon catheter which is assembled by a process of selectively concentrating laser energy along an annular fusion bond site at contiguous surface portions of a length of catheter tubing and a shaft or neck portion of a dilatation balloon. The laser energy wavelength, and the polymeric materials of the balloon and catheter, are matched for high absorption of the laser energy to minimize conductive heat transfer in axial directions away from the bond site. This minimizes crystallization and stiffening in regions near the bond site, permitting fusion bonds to be located close to the proximal and distal cones of the dilatation balloon while preserving the soft, pliant quality of the cones.
Abstract:
A breast brachytherapy applicator providing a stable semi permanent/permanent in dwelling platform that is configured to replicate anatomically the excised cancer bed and allows for a more precise anatomically correct delivery of limited field radiation treatment. This device may be used to reconstitute a resected tissue space to its pre-operative size and shape to 1) facilitate the accurate and precise delivery of adjunctive breast brachytherapy following breast cancer surgery and 2) prevent/decrease post-operative deformity as a result of surgical resection, whether for benign or malignant disease, and in particular after radiation treatment of malignant disease in the post lumpectomy patient.