250 results about "Infusion catheter" patented technology

An evacuation sheath assembly and method of treating occluded vessels which reduces the risk of distal embolization during vascular interventions is provided. The evacuation sheath assembly includes an elongated tube defining an evacuation lumen having proximal and distal ends. A proximal sealing surface is provided on a proximal portion of the tube and is configured to form a seal with a lumen of a guided catheter. A distal sealing surface is provided on a distal portion of the tube and is configured to form a seal with a blood vessel. Obturator assemblies and infusion catheter assemblies are provided to be used with the evacuation sheath assembly. A method of treatment of a blood vessel using the evacuation sheath assembly includes advancing the evacuation sheath assembly into the blood vessel through a guide catheter. Normal antegrade blood flow in the blood vessel proximate to the stenosis is stopped and the stenosis is treated. Retrograde blood flow is induced within the blood vessel to carry embolic material dislodged during treating into the evacuation sheath assembly. If necessary to increase retrograde flow, the coronary sinus may be at least partially occluded. Alternatively, antegrade flow may be permitted while flow is occluded at the treatment site.

The present invention is directed to apparatus and methods for treating a vascular occlusion by providing an infusion catheter having an atraumatic tip and at least one delivery port configured to infuse fluid into the occlusion. The fluid that is infused dilutes the occlusion and reduces adhesion of the occlusion to an intima of the vessel wall, thereby causing the occlusion to dislodge. Emboli generated in the process are directed into an emboli removal catheter for removal.

According to one embodiment, a neurological stimulation system is adapted for implantation into a person's body for electrical, chemical, or combined electrical and chemical stimulation of target nerve tissue in the person's brain stem. For electrical stimulation, the system includes an electrical stimulation lead adapted for implantation on, in, or near the brain stem, and including electrodes adapted to be positioned on, in, or near target nerve tissue in the brain stem, for delivering electrical stimulation energy to the target nerve tissue. For chemical stimulation, the system includes an infusion catheter adapted for implantation on, in, or near the brain stem, and including openings adapted to be positioned on, in, or near target nerve tissue in the brain stem, for delivering a chemical to the target nerve tissue. The system also includes a stimulation source adapted for implantation in the person's body and operable to generate pulses of electrical stimulation energy or pulses of the chemical, for delivery to the target nerve tissue in the brain stem.

A pressure actuated flow control valve for an infusion catheter permits gravity flow of a liquid through the catheter and into a patient while resisting back flow of blood from the patient and into the catheter. The valve has a hemispherical body with an outstanding circumferential flange and a normally closed, diametric slit. The slit is longer on the convex outer surface than on the concave inner surface. Dome thickness diminishes in the area adjacent the slit, reducing total apical deflection upon collapse of the slit toward the concave surface. An inner orthogonal rib biases the slit closed. Upon application of a predetermined pressure, the slit opens toward the concave surface to permit forward fluid flow. At lower pressures, the slit closes to check fluid flow. Greater reverse pressure is required to collapse the slit toward the concave surface to permit reverse fluid flow.

The invention relates to a method and a system for determining the blood flow in an individual coronary artery of a patient, wherein the method comprises the steps of positioning a temperature sensor mounted at a distal portion of a guide wire at a distal position in the coronary artery, positioning an infusion catheter in the coronary artery such that the distal end of the infusion catheter is proximally of the temperature sensor, measuring the blood temperature with the temperature sensor, infusing cold indicator fluid with a known infusion rate and known or measurable temperature into the coronary artery by the infusion catheter, measuring the temperature of the mixture of blood and indicator fluid by the temperature sensor, and calculating the coronary blood flow by a formula based on the known and measured quantities. In an extended version, the method comprises steps for relating the calculated coronary flow value to related normal flow values, or related FFR values, or a related flow resistance.

A device and method to dissolve or eliminate blood clots from a patient relies upon a non-rapid moving mechanism to physically dissolve clots without damaging endothelium of the arteries and veins of a patient. In one embodiment, in addition to mechanical agitation of a clot, a thrombolytic agent is administered simultaneously with such agitation. Preferably, intermittent agitation is utilized over a prolonged period of time to effectuate clot removal.

Systems, devices and methods for delivery of a chemical substance to the body of the patient are provided. Such embodiments may include an infusion catheter configured to be inserted into tissue, a catheter securing element configured to be adhered to the skin of the patient and further configured to secure the infusion catheter to the skin, a drug delivery pump configured to infuse a drug into the infusion catheter for delivery to a drug infused region on the body of the patient, and a treatment element configured to apply a treatment to the drug infused region to improve pharmacodynamics of the drug during a period of delivery of the drug to the patient.

An inflatable gastric band incorporates a fluid channel within an outer surface of the band and an inflatable bladder on a stomach-facing side of the band. The gastric band attaches to a double lumen catheter, which communicates with a dual infusion port. One lumen communicates with the fluid channel and one port, while the other lumen communicates with the inflatable bladder and a second port. Injection of fluid into one chamber of the infusion port expands inflatable bladder, allowing adjustment to the diameter of the stoma. Injection of drugs or therapeutic agents into the second chamber allows the infusion of drugs or agents directly into the abdominal cavity of a gastric band recipient. The inflatable bladder can be continuous or segmented. A segmented bladder reduces pinching and/or folding of the inner surface of the gastric band during expansion/contraction, thereby lessening stomach pinching and/or irritation.

An infusion catheter system includes an elongated catheter body and an inner elongated cannula body. The catheter body has a sidewall perforated with a plurality of side ports and the cannula body may have an outlet opening in a distal end. The side ports of the catheter body are selectively in fluid communication with the outlet opening of the cannula by moving the cannula between a first and second position within the catheter body.

An adjustable infusion catheter includes a flexible tube containing one or more axial lumens that allows fluid to flow from the proximal end of the catheter to the distal end. A syringe or infusion pump is the usual pressure source for fluid at the proximal end. A plurality of small-diameter holes are provided in a fenestrated area near the distal end of the tube to disperse fluid throughout a targeted region within the patient's body. The length of the fenestrated area of the catheter body is adjusted by a slidable sheath which can be positioned along the length of the fenestrated area so that its exposed length substantially matches the targeted region. The ends of the slidable sheath include a seal portion to prevent leakage around the ends of the sheath. Heat shrinkable plastic material can be used to form the sheath and the end seals.

A safety transfusion catheter includes a flexible retention tube (2) fitted over a metal guiding needle (1). The flexible retention tube (2) is provided with a needle handle (22; 22′) connected with it. The angle between the end (3) of the flexible retention tube (2) and its longitudinal axis or longitudinal tube wall is less than 90°. The cross section of the needle handle (22; 22′) has an outer contour line of a closed curve formed with a curve (5, 25) intersecting a beeline (6; 26). A further safety transfusion catheter includes a flexible retention tube (39) fitted over a metal guiding needle (32), a transfusion connecting tube (38) in fluid communication with flexible retention tube (39) and a rubber casing cap (42) at the end of the flexible retention tube (39). The transfusion connecting tube (38) and flexible retention tube (39) form a T-shaped or an oblique Y-shaped structure.

Devices, systems, and methods for accessing tissue, including the internal and external tissues of the heart, are disclosed. At feast some of the embodiments disclosed herein provide access to the tissues surrounding the heart to facilitate myocardial infarct healing and border zone reinforcement. In at least one embodiment, a suction/infusion catheter is used to provide localized suction to an area of myocardial infarct. In another embodiment, a suction infusion catheter is used to deliver a glue-like substance and magnetic cells to a myocardial infarct border zone.

A system for moving particles suspended in a first fluid, and for infusing them into the stream of a second fluid, includes a catheter with a multi-lumen distal separator. The separator is formed with a plurality of parallel lumens, wherein each lumen has a predetermined diameter to reduce particle flocculation. An inflatable balloon, affixed to the outside of the catheter, can be provided to regulate flow of the second fluid and thereby facilitate entry of the particles into the stream of the second fluid. A reinforcing member is employed to strengthen the catheter wall under the inflatable balloon. With this arrangement, the catheter does not kink or collapse due to the pressure exerted on the catheter wall when the balloon is inflated. In one embodiment, the reinforcing member includes an annular shaped ring. In another embodiment, the separator is positioned under the balloon and acts as the reinforcing member.

The invention relates to a high-efficiency needleless coaxial electrostatic spinning device and method. The high-efficiency needleless coaxial electrostatic spinning device comprises a step-shaped needleless spinneret, a liquid feed system, a solution recovery tank, a receiving board and a high-voltage electrostatic generator. The liquid feed system comprises a propeller, an insulating rod and solution storing containers. A cylindrical hollow portion is arranged in the center of the step-shaped needleless spinneret, wherein two infusion catheters with different diameters are concentrically arranged at the cylindrical hollow portion in the axial direction; the two infusion catheters with different diameters are connected with the shell solution storing container and the core solution storing container respectively; the solution recovery tank is arranged at the bottom of the step-shaped needleless spinneret. According to the method, the high-efficiency needleless coaxial electrostatic spinning device is used for spinning. The step-shaped needleless spinneret of the high-efficiency needleless coaxial electrostatic spinning device can avoid the phenomenon that a pinhead is blocked, and is easy to clean and good in stability. The electrostatic spinning method effectively improves production efficiency of core-shell structure nanofiber and can realize continuous and large-scale production of the core-shell structure nanofiber.

The present invention relates to a medicinal transfusion system with heating body positioned under the Murphy's dropper, said heating body adopts electric resistance heating wire or electric heating tube or far infrared heater or ceramic heater or radio-frequency heater or semiconductor heater or other liquid heat source which can enure that the temp. of blood or liquid medicine for transfusion is approximate to body temp. so as to completely eliminate the blood transfusion and fluid infusion reaction due to infusion of low-temp fluid.

An automated therapy system having an infusion catheter; a sensor adapted to sense a patient parameter; and a controller communicating with the sensor and programmed to control flow output from the infusion catheter into a patient based on the patient parameter without removing fluid from the patient. The invention also includes a method of controlling infusion of a fluid to a patient. The method includes the following steps: monitoring a patient parameter with a sensor to generate a sensor signal; providing the sensor signal to a controller; and adjusting fluid flow to the patient based on the sensor signal without removing fluid from the patient.